/* ═══════════════════════════════════════════════════════════════
   MATHYESSY — Complete design system v6
   Typeface: Space Grotesk (display) + Inter (body)
   Subject palette: blue algebra · green counting · purple geometry · teal number theory
   ═══════════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Inter:wght@400;500;600;700;800;900&display=swap');

:root {
  /* Core palette */
  --ink:        #0d1829;
  --ink-mid:    #2c3a52;
  --muted:      #5b6f8e;
  --muted-lt:   #8fa0b8;
  --bg:         #f3f6fc;
  --surface:    #ffffff;
  --border:     #dde4f0;
  --border-lt:  #eef2f9;

  /* Brand */
  --primary:      #2563eb;
  --primary-dk:   #1d4ed8;
  --primary-lt:   #eff3ff;
  --primary-glow: rgba(37,99,235,.18);

  /* Subject accents */
  --alg:    #2563eb;  /* Algebra — blue */
  --cnt:    #059669;  /* Counting — emerald */
  --geo:    #7c3aed;  /* Geometry — violet */
  --num:    #0891b2;  /* Number theory — cyan */

  /* Functional */
  --green:  #059669;
  --red:    #dc2626;
  --gold:   #d97706;
  --radius: 20px;
  --shadow-sm: 0 1px 3px rgba(13,24,41,.06), 0 4px 12px rgba(13,24,41,.04);
  --shadow:    0 2px 6px rgba(13,24,41,.06), 0 12px 32px rgba(13,24,41,.08);
  --shadow-lg: 0 4px 12px rgba(13,24,41,.06), 0 24px 64px rgba(13,24,41,.12);
}

/* ── Dark mode ─────────────────────────────────────────────────── */
body.dark {
  --ink:        #ecf2ff;
  --ink-mid:    #b8ccec;
  --muted:      #80a0c8;
  --muted-lt:   #5a7898;
  --bg:         #1c2d48;
  --surface:    #263d5c;
  --border:     #2e4a6a;
  --border-lt:  #243e5c;
  --primary:      #5294f5;
  --primary-dk:   #f0b429;
  --primary-lt:   #1a2a44;
  --primary-glow: rgba(82,148,245,.22);
  --shadow-sm: 0 1px 3px rgba(0,0,0,.28), 0 4px 12px rgba(0,0,0,.18);
  --shadow:    0 2px 6px rgba(0,0,0,.28), 0 12px 32px rgba(0,0,0,.22);
  --shadow-lg: 0 4px 12px rgba(0,0,0,.28), 0 24px 64px rgba(0,0,0,.32);
  background: #1c2d48 !important;
  color: #ecf2ff !important;
}
body.dark .site-header { background: #1c2d48; border-bottom-color: #2e4a6a; }
body.dark .button.secondary { background: rgba(38,61,92,.9); color: #b8ccec; border-color: #2e4a6a; }
body.dark .button.secondary:hover { background: #2e4a6a; border-color: #f0b429; color: #f0b429; }
body.dark .button.ghost { color: var(--primary); border-color: #253448; }
body.dark .button.ghost:hover { background: #263d5c; border-color: #f0b429; color: #f0b429; }
body.dark .nav-links a:hover { background: #2e4a6a; color: #f0b429; }
body.dark .dashboard-hero { background: linear-gradient(135deg, #1c2d48, #263d5c); }
body.dark .ql2-header { background: linear-gradient(135deg,#0a1628,#0f1e38 60%,#1a1040); }
body.dark .ql-header { background: linear-gradient(135deg,#0a1628,#0f1e38 50%,#1a1040); }
body.dark .quest-hero { background: linear-gradient(135deg,#1c2d48,#263d5c); }
body.dark .subhero { background: linear-gradient(135deg,#1c2d48,#263d5c); }
body.dark .ql-worked-example { background: linear-gradient(145deg,#1a1a0a,#1c2a40); border-color: #4a3800; }
body.dark .ql-worked-insight { background: #1a1200; border-color: #3d2800; }
body.dark .qps-easy { background: linear-gradient(180deg,#0a1220,#1c2a40); }
body.dark .qps-skill { background: linear-gradient(180deg,#0a1a14,#1c2a40); }
body.dark .qps-contest { background: linear-gradient(180deg,#130a20,#1c2a40); }
body.dark .ql-why-card { background: linear-gradient(145deg,#120a20,#1c2a40); border-color: #2d1a5e; }
body.dark .ql-goal-card { background: linear-gradient(145deg,#0a1228,#1c2a40); border-color: #253448; }
body.dark .ql2-quiz-intro { background: linear-gradient(145deg,#0a1228,#1c2a40); border-color: #253448; }
body.dark input, body.dark textarea, body.dark select { background: var(--bg); color: var(--ink); border-color: var(--border); }
body.dark input::placeholder { color: var(--muted); }

/* -- Dark mode comprehensive overrides ------------------------------------------ */

/* Unit cards on learning page */
body.dark .unit-card[data-subject="algebra"]       { background: linear-gradient(145deg,#0f1e38,#162040); border-color: #253d6a; }
body.dark .unit-card[data-subject="counting"]      { background: linear-gradient(145deg,#0a1e18,#0f2820); border-color: #1a3d2a; }
body.dark .unit-card[data-subject="geometry"]      { background: linear-gradient(145deg,#1e1600,#201800); border-color: #3d3000; }
body.dark .unit-card[data-subject="number-theory"] { background: linear-gradient(145deg,#18102a,#1c1230); border-color: #341a5e; }
body.dark .unit-card[data-subject="algebra"] .unit-icon       { background: #1a2f50; color: #60a5fa; }
body.dark .unit-card[data-subject="counting"] .unit-icon      { background: #0e2218; color: #34d399; }
body.dark .unit-card[data-subject="geometry"] .unit-icon      { background: #221c00; color: #fbbf24; }
body.dark .unit-card[data-subject="number-theory"] .unit-icon { background: #1e1030; color: #c084fc; }
body.dark .unit-card[data-subject="algebra"] h3       { color: #93c5fd; }
body.dark .unit-card[data-subject="counting"] h3      { color: #6ee7b7; }
body.dark .unit-card[data-subject="geometry"] h3      { color: #fcd34d; }
body.dark .unit-card[data-subject="number-theory"] h3 { color: #d8b4fe; }

/* Scratchpad canvas */
body.dark canvas {
  background-color: #182338 !important;
  background-image:
    linear-gradient(rgba(82,148,245,.09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(82,148,245,.09) 1px, transparent 1px) !important;
}

/* Solution visual card SVG backgrounds */
body.dark .visual-card svg          { background: #1a2840 !important; }
body.dark .algebra-visual svg       { background: linear-gradient(180deg,#0f1e38,#1a2840) !important; }
body.dark .counting-visual svg      { background: linear-gradient(180deg,#0a1e18,#102218) !important; }
body.dark .geometry-visual svg      { background: linear-gradient(180deg,#18102a,#1c1530) !important; }
body.dark .number-visual svg        { background: linear-gradient(180deg,#081e22,#0a2028) !important; }
body.dark .quest-visual-card        { background: linear-gradient(145deg,#1a2840,#1c2d48); }

/* Practice feedback boxes */
body.dark .feedback.correct   { background: #0a200f; color: #86efac; border-color: #14532d; }
body.dark .feedback.incorrect { background: #200a0a; color: #fca5a5; border-color: #7f1d1d; }
body.dark .hint-box           { background: #1e1500; color: #fde68a; border-color: #3d2e00; }
body.dark .hint-idea          { background: #0f1e38; border-color: #253d6a; }

/* Solution panels */
body.dark .sol-answer         { background: #0a200f; border-color: #14532d; }
body.dark .sol-answer-value   { color: #86efac; }
body.dark .sol-answer-icon    { background: #14532d; color: #86efac; }
body.dark .sol-step-idea      { background: #101e38; border-left-color: var(--primary); color: #93c5fd; }
body.dark .sol-step-trap      { background: #1e1500; border-left-color: #f59e0b; color: #fde68a; }
body.dark .sol-step-answer    { background: #0a200f; border-left-color: #22c55e; color: #86efac; }
body.dark .sol-trap           { background: #1e1500; border-color: #3d2e00; color: #fde68a; }
body.dark .sol-idea           { background: #101e38; border-color: #1e3560; }

/* Dashboard review buttons */
body.dark .dash-review-btn    { background: rgba(255,255,255,.04); border-color: rgba(255,255,255,.12); }
body.dark .dash-review-btn:hover { background: rgba(255,255,255,.09); border-color: var(--primary); }

/* Mock exam segment badges */
body.dark .seg-found { background: #0f1e38; border-color: #253d6a; color: #93c5fd; }
body.dark .seg-int   { background: #1e1500; border-color: #3d2e00; color: #fde68a; }
body.dark .seg-chal  { background: #18102a; border-color: #341a5e; color: #c084fc; }

/* Quest incorrect answer feedback */
body.dark .quest-result.incorrect          { background: #200a0a; border-color: #7f1d1d; color: #fca5a5; }
body.dark .quest-question.answer-incorrect { border-color: #7f1d1d; background: #200a0a; }
body.dark .answer-incorrect .quest-answer-note { background: #200a0a; color: #fca5a5; border-color: #7f1d1d; }
body.dark .mock-question.answer-incorrect  { border-color: #7f1d1d; background: #200a0a; }
body.dark .answer-row input.incorrect-input { border-color: #dc2626; background: #200a0a; }



/* ── Dark mode toggle button ───────────────────────────────────── */
.dark-mode-toggle {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 9999;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: 999px;
  padding: 8px 16px;
  font-size: .8rem;
  font-weight: 700;
  color: var(--ink-mid);
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: background .2s, color .2s, border-color .2s, box-shadow .2s;
  font-family: inherit;
  display: flex;
  align-items: center;
  gap: 6px;
}
.dark-mode-toggle:hover { box-shadow: var(--shadow-lg); border-color: var(--primary); color: var(--primary); }

/* ── Reset & base ──────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; overflow-x: hidden; }
body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--ink);
  font-size: 15px;
  line-height: 1.6;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
button, input, select { font: inherit; }
img, svg { display: block; }
p { margin-top: 0; }
h1, h2, h3, h4 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  margin-top: 0;
  line-height: 1.1;
  letter-spacing: -.02em;
}
h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); font-weight: 900; color: var(--ink); letter-spacing: -.03em; }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); font-weight: 700; color: var(--ink); margin-bottom: 10px; }
h3 { font-size: 1.15rem; font-weight: 700; color: var(--ink); margin-bottom: 8px; }

/* ── Navigation ────────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,.75);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  border-bottom: 1px solid rgba(221,228,240,.6);
}
.nav-shell {
  width: min(1200px, calc(100% - 32px));
  margin: 0 auto;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1rem;
  color: var(--ink);
  letter-spacing: -.01em;
}
.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), #7c3aed);
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 800;
  font-size: .9rem;
  flex-shrink: 0;
}
.nav-links {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 2px;
}
.nav-links a {
  padding: 5px 9px;
  border-radius: 10px;
  font-size: .8rem;
  font-weight: 600;
  color: var(--muted);
  transition: .15s ease;
  white-space: nowrap;
}
.nav-links a:hover { color: var(--ink); background: var(--border-lt); }
.nav-links a.active {
  color: var(--primary);
  background: var(--primary-lt);
  font-weight: 700;
}
.menu-toggle { display: none; margin-left: auto; border: 0; background: transparent; font-size: 1.5rem; cursor: pointer; }

/* ── Layout utilities ──────────────────────────────────────────── */
.section, .dashboard-hero {
  width: min(1200px, calc(100% - 32px));
  margin: 48px auto;
}
.eyebrow {
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--primary);
  margin: 0 0 8px;
}

/* ── Buttons ───────────────────────────────────────────────────── */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: 0;
  border-radius: 999px;
  font-family: 'Inter', sans-serif;
  font-weight: 700;
  font-size: .875rem;
  padding: 11px 22px;
  cursor: pointer;
  transition: .15s ease;
  white-space: nowrap;
}
.button.primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 1px 2px rgba(37,99,235,.25), 0 4px 14px rgba(37,99,235,.22);
}
.button.primary:hover { background: var(--primary-dk); transform: translateY(-1px); box-shadow: 0 4px 16px rgba(37,99,235,.32); }
.button.secondary { background: rgba(255,255,255,.8); color: var(--primary-dk); border: 1.5px solid #c7d7fb; backdrop-filter: blur(4px); }
.button.secondary:hover { background: #e8f0ff; border-color: var(--primary); }
.button.ghost { background: transparent; color: var(--primary); border: 1.5px solid var(--border); border-radius: 999px; }
.button.ghost:hover { background: var(--primary-lt); border-color: #c7d7fb; }
.button.small { padding: 7px 16px; font-size: .8rem; }
.button:disabled { opacity: .45; cursor: not-allowed; transform: none !important; }
.ghost { border: 0; background: transparent; color: var(--primary); font-weight: 700; cursor: pointer; padding: 8px; font-size: inherit; }
.ghost:disabled { color: var(--muted); cursor: not-allowed; opacity: .6; }

/* ── Cards (base) ──────────────────────────────────────────────── */
.dashboard-card, .mission-card, .problem-card, .scratchpad-card,
.exam-card, .info-card, .history-card, .choice-card,
.category-card, .review-grid article {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.dashboard-card, .mission-card, .info-card, .history-card { padding: 24px; }

/* ── Dashboard hero ────────────────────────────────────────────── */
.dashboard-hero {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 24px;
  align-items: start;
}
.hero-text, .section-heading p, .subhero p, .dashboard-card p, .info-card p {
  color: var(--muted);
  line-height: 1.7;
}
.hero-actions { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-top: 20px; }
.mini-stats { display: grid; grid-template-columns: repeat(3,1fr); gap: 10px; margin-top: 18px; }
.mini-stats div { background: var(--bg); border: 1px solid var(--border); border-radius: 12px; padding: 12px 14px; }
.mini-stats strong { display: block; font-size: 1.25rem; font-weight: 700; color: var(--ink); }
.mini-stats span { color: var(--muted); font-size: .78rem; font-weight: 600; }
.card-topline { display: flex; justify-content: space-between; align-items: center; gap: 12px; color: var(--muted); font-weight: 700; font-size: .82rem; margin-bottom: 16px; }
.pill { background: #ecfdf5; color: #065f46; border-radius: 8px; padding: 4px 10px; font-size: .78rem; font-weight: 700; }
.muted-pill { background: var(--bg); color: var(--muted); }

/* ── Category grid ─────────────────────────────────────────────── */
.category-grid, .practice-choice-grid {
  display: grid;
  grid-template-columns: repeat(4,1fr);
  gap: 16px;
}
.category-card, .choice-card { padding: 20px; }
.category-card.blue, .choice-card.blue { background: linear-gradient(145deg,#eff3ff,#fff); border-color: #c7d7fb; }
.category-card.green, .choice-card.green { background: linear-gradient(145deg,#ecfdf5,#fff); border-color: #a7f3d0; }
.category-card.purple, .choice-card.purple { background: linear-gradient(145deg,#f5f3ff,#fff); border-color: #ddd6fe; }
.category-card.teal, .choice-card.teal { background: linear-gradient(145deg,#ecfeff,#fff); border-color: #a5f3fc; }
.choice-card.mixed { background: linear-gradient(145deg,#eff3ff,#ecfdf5); }
.choice-card { display: block; transition: .15s ease; }
.choice-card:hover, .unit-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.choice-card span { font-weight: 800; color: var(--primary); text-transform: uppercase; letter-spacing: .07em; font-size: .72rem; }

/* ── Unit grid ─────────────────────────────────────────────────── */
.unit-grid, .mastery-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 16px; }
.unit-card, .mastery-card { padding: 20px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); transition: transform .15s, box-shadow .15s; }
/* Per-subject gradient tints */
.unit-card[data-subject="algebra"]       { background: linear-gradient(145deg, #f0f4ff 0%, #e8f0fe 100%); border-color: #c7d7fc; }
.unit-card[data-subject="counting"]      { background: linear-gradient(145deg, #f0fdf4 0%, #dcfce7 100%); border-color: #bbf7d0; }
.unit-card[data-subject="geometry"]      { background: linear-gradient(145deg, #fef9f0 0%, #fef3c7 100%); border-color: #fde68a; }
.unit-card[data-subject="number-theory"] { background: linear-gradient(145deg, #fdf4ff 0%, #f3e8ff 100%); border-color: #e9d5ff; }
.unit-card[data-subject="algebra"] .unit-icon       { background: #dbeafe; color: #1d4ed8; }
.unit-card[data-subject="counting"] .unit-icon      { background: #dcfce7; color: #15803d; }
.unit-card[data-subject="geometry"] .unit-icon      { background: #fef9c3; color: #a16207; }
.unit-card[data-subject="number-theory"] .unit-icon { background: #f3e8ff; color: #7e22ce; }
.unit-card[data-subject="algebra"] h3       { color: #1e40af; }
.unit-card[data-subject="counting"] h3      { color: #166534; }
.unit-card[data-subject="geometry"] h3      { color: #92400e; }
.unit-card[data-subject="number-theory"] h3 { color: #6b21a8; }
.unit-icon { width: 44px; height: 44px; display: grid; place-items: center; border-radius: 12px; background: var(--bg); font-size: 1.2rem; margin-bottom: 14px; }
.lesson-list { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 14px; }
.lesson-list span { border: 1px solid var(--border); color: var(--muted); border-radius: 8px; padding: 5px 9px; font-size: .75rem; font-weight: 600; }

/* ── Subhero banners ───────────────────────────────────────────── */
.subhero {
  width: min(1200px, calc(100% - 32px));
  margin: 28px auto 0;
  padding: 36px 40px;
  border-radius: 24px;
  color: #fff;
  box-shadow: var(--shadow);
}
.subhero .eyebrow { color: rgba(255,255,255,.7); }
.subhero h1 { color: #fff; margin-bottom: 8px; }
.subhero p { color: rgba(255,255,255,.82); margin: 0; }
.gradient-blue   { background: linear-gradient(135deg,#1d4ed8 0%,#2563eb 100%); }
.gradient-green  { background: linear-gradient(135deg,#047857 0%,#059669 100%); }
.gradient-purple { background: linear-gradient(135deg,#5b21b6 0%,#7c3aed 100%); }
.gradient-teal   { background: linear-gradient(135deg,#0e7490 0%,#0891b2 100%); }
.gradient-dark   { background: linear-gradient(135deg,#0f172a 0%,#1e3a8a 100%); }

/* ── PRACTICE PAGE — the money layout ─────────────────────────── */
.practice-layout {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 0;
  align-items: start;
  margin-top: 28px;
}
.scratch-width-handle {
  width: 8px;
  cursor: ew-resize;
  background: transparent;
  position: relative;
  align-self: stretch;
  flex-shrink: 0;
  transition: background .15s;
  border-radius: 4px;
  margin: 0 4px;
}
.scratch-width-handle::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
  width: 4px;
  height: 40px;
  background: var(--border);
  border-radius: 2px;
  transition: background .15s;
}
.scratch-width-handle:hover::after, .scratch-width-handle.dragging::after { background: var(--primary); }
.practice-panel { display: flex; flex-direction: column; gap: 0; }

/* Practice controls */
.practice-controls-v2 {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 13px 18px;
  margin-bottom: 16px;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  box-shadow: var(--shadow-sm);
}
.pcv2-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.pcv2-group { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.pcv2-label {
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--muted);
  white-space: nowrap;
  min-width: 64px;
}
.pcv2-chips { display: flex; gap: 5px; flex-wrap: wrap; }
.pcv2-chip {
  border: 1px solid var(--border);
  background: var(--bg);
  border-radius: 8px;
  padding: 6px 13px;
  font-size: .8rem;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  transition: .12s ease;
}
.pcv2-chip:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-lt); }
.pcv2-chip.active { background: var(--primary); border-color: var(--primary); color: #fff; font-weight: 700; box-shadow: 0 2px 6px var(--primary-glow); }
.pcv2-hidden-select { display: none; }
.pcv2-topic-dropdown {
  border: 1px solid var(--border);
  background: var(--bg);
  border-radius: 9px;
  padding: 7px 34px 7px 12px;
  font-size: .85rem;
  font-weight: 600;
  color: var(--ink-mid);
  cursor: pointer;
  min-width: 200px;
  max-width: 400px;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%235b6f8e' stroke-width='2.5'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  transition: .12s ease;
}
.pcv2-topic-dropdown:hover { border-color: var(--primary); }
.pcv2-topic-dropdown:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-glow); }

/* Problem card */
.problem-card {
  padding: 28px;
  border-radius: var(--radius);
  position: relative;
  overflow: hidden;
}
/* Subject-colored left accent bar */
.problem-card::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 4px;
  border-radius: 4px 0 0 4px;
  background: var(--primary);
  transition: background .3s ease;
}
body[data-topic="algebra"]       .problem-card::before { background: var(--alg); }
body[data-topic="counting"]      .problem-card::before { background: var(--cnt); }
body[data-topic="geometry"]      .problem-card::before { background: var(--geo); }
body[data-topic="number-theory"] .problem-card::before { background: var(--num); }

/* Problem meta badges */
.problem-meta { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 16px; align-items: center; }
.problem-meta span {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: 4px 10px;
  font-size: .75rem;
  font-weight: 700;
  color: var(--muted);
}
.problem-meta span:first-child { color: var(--primary); background: var(--primary-lt); border-color: #c7d7fb; }

/* Problem text */
.problem-card h2 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--muted);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: .07em;
  font-family: 'Inter', sans-serif;
}
#problemText {
  font-size: 1.2rem;
  line-height: 1.75;
  color: var(--ink);
  font-weight: 500;
  margin-bottom: 0;
}

/* Answer row */
.answer-row {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 20px;
}
.answer-row input {
  flex: 1;
  min-width: 180px;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 11px 14px;
  font-size: .95rem;
  background: var(--surface);
  color: var(--ink);
  transition: .12s ease;
}
.answer-row input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-glow); }
.next-problem-button { min-width: 130px; }
#nextProblem { white-space: nowrap; }

/* Answer format note */
.answer-format-note { display: block; font-size: .75rem; color: var(--muted); margin-top: 8px; line-height: 1.5; }

/* Hint / solution buttons */
.hint-actions { display: flex; gap: 8px; margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--border-lt); flex-wrap: wrap; }
.hint-actions .ghost {
  font-size: .82rem; padding: 6px 14px; color: var(--primary); font-weight: 700;
  border: 1.5px solid var(--border); border-radius: 8px; background: var(--surface);
}
.hint-actions .ghost:hover { border-color: var(--primary); background: var(--primary-lt); }

/* Feedback banners */
.feedback, .hint-box, .solution-box {
  border-radius: 12px;
  padding: 14px 16px;
  margin: 12px 0;
  line-height: 1.6;
  font-size: .92rem;
}
.feedback.correct { background: #f0fdf4; color: #14532d; border: 1px solid #bbf7d0; }
.feedback.incorrect { background: #fff7ed; color: #7c2d12; border: 1px solid #fed7aa; }
.hint-box { background: #fffbeb; color: #78350f; border: 1px solid #fde68a; }
.solution-box { background: var(--primary-lt); color: #1e3a8a; border: 1px solid #c7d7fb; }
.hidden { display: none; }

/* ── VISUAL CARDS — full-width, subject-accented ───────────────── */
.solution-visual { margin: 16px 0; }
.visual-card {
  display: block !important;
  background: var(--surface) !important;
  border: 1px solid var(--border) !important;
  border-radius: 14px !important;
  overflow: hidden;
  box-shadow: var(--shadow-sm) !important;
  padding: 0 !important;
}
/* Colored top strip per subject */
.visual-card::before {
  content: '';
  display: block;
  height: 3px;
  background: var(--primary);
}
.algebra-visual::before   { background: linear-gradient(90deg, var(--alg), #60a5fa); }
.counting-visual::before  { background: linear-gradient(90deg, var(--cnt), #34d399); }
.geometry-visual::before  { background: linear-gradient(90deg, var(--geo), #a78bfa); }
.number-visual::before    { background: linear-gradient(90deg, var(--num), #22d3ee); }

.visual-card svg {
  display: block !important;
  width: 100% !important;
  max-width: 100% !important;
  height: auto !important;
  background: #f8faff !important;
  border-radius: 0 !important;
  justify-self: unset !important;
}
.geometry-visual svg  { background: linear-gradient(180deg,#f8f5ff,#f4f0ff) !important; }
.counting-visual svg  { background: linear-gradient(180deg,#f0fdf6,#ecfdf5) !important; }
.number-visual svg    { background: linear-gradient(180deg,#ecfeff,#e0f9fe) !important; }
.algebra-visual svg   { background: linear-gradient(180deg,#eff3ff,#ebf0ff) !important; }

.visual-card text {
  font-family: 'Inter', system-ui, sans-serif !important;
  font-size: 13px !important;
  stroke: none !important;
}
.vc-body {
  padding: 11px 15px 13px;
  border-top: 1px solid var(--border-lt);
}
.vc-body-text {
  margin: 0;
  color: var(--ink-mid);
  font-size: .82rem;
  line-height: 1.55;
  font-weight: 500;
}
.visual-number-row { display: flex; gap: 5px; flex-wrap: wrap; margin-top: 7px; }
.visual-number-row span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  border-radius: 6px;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--ink-mid);
  font-weight: 700;
  font-size: .75rem;
  padding: 3px 7px;
}

/* ── Scratchpad ────────────────────────────────────────────────── */
.scratchpad-card {
  padding: 18px 20px;
  position: sticky;
  top: 80px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.scratch-split { display: flex; flex-direction: column; gap: 0; }
.scratch-handle { height: 8px; background: var(--border); border-radius: 4px; cursor: ns-resize; margin: 4px 0; transition: background .15s; }
.scratch-handle:hover { background: var(--primary); }
.typed-scratchpad { resize: none; width: 100%; box-sizing: border-box; border: 1px solid var(--border); border-radius: 12px; padding: 10px 12px; font-family: inherit; font-size: .88rem; color: var(--ink); background: var(--bg); min-height: 60px; }

canvas {
  width: 100%;
  height: auto;
  border-radius: 12px;
  touch-action: none;
  cursor: crosshair;
  /* Graph paper background */
  background-color: #fff;
  background-image:
    linear-gradient(rgba(37,99,235,.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37,99,235,.06) 1px, transparent 1px);
  background-size: 20px 20px;
  border: 1px solid var(--border);
}
.microcopy { color: var(--muted); font-size: .78rem; margin: 8px 0 0; }

/* ── History / review ──────────────────────────────────────────── */
.history-card { padding: 24px; }
.history-top { display: flex; justify-content: space-between; gap: 16px; align-items: start; margin-bottom: 16px; }
.review-list { display: grid; gap: 8px; }
.review-item { border: 1px solid var(--border); border-radius: 14px; background: var(--surface); overflow: hidden; transition: .12s ease; }
.review-item:hover { border-color: #c7d7fb; }
.review-summary { width: 100%; text-align: left; border: 0; background: transparent; padding: 13px 16px; cursor: pointer; display: flex; justify-content: space-between; gap: 12px; align-items: center; font-weight: 700; font-size: .9rem; }
.review-summary span { color: var(--muted); font-weight: 600; font-size: .8rem; white-space: nowrap; }
.review-details { display: none; border-top: 1px solid var(--border-lt); padding: 14px 16px; color: var(--muted); line-height: 1.65; background: #fafbfe; }
.review-item.open .review-details { display: block; }
.detail-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 8px; margin-bottom: 10px; }
.detail-grid div { background: var(--bg); border-radius: 10px; padding: 10px; font-size: .85rem; }

/* ── Select & input base ───────────────────────────────────────── */
select, input {
  border: 1.5px solid var(--border);
  background: var(--surface);
  border-radius: 10px;
  padding: 10px 13px;
  outline: none;
  color: var(--ink);
  transition: .12s ease;
}
select:focus, input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-glow); }

/* ── Misc ──────────────────────────────────────────────────────── */
.bar { width: 100%; height: 8px; border-radius: 999px; overflow: hidden; background: var(--bg); border: 1px solid var(--border); }
.bar span { display: block; height: 100%; background: linear-gradient(90deg, var(--primary), var(--cnt)); border-radius: inherit; }
.mastery-card .bar { margin: 12px 0 8px; }
.mastery-level { color: var(--muted); font-weight: 700; font-size: .85rem; }
.quiz-lock { margin-top: 10px; font-weight: 700; color: var(--primary); font-size: .88rem; }
.pretty-list { line-height: 1.9; color: var(--muted); }
.difficulty-row { display: flex; gap: 7px; flex-wrap: wrap; }
.difficulty-row span { background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 7px 11px; font-weight: 700; font-size: .82rem; color: var(--muted); }
.solution-answer { margin: 10px 0 0 !important; border-radius: 10px; background: var(--surface); padding: 12px 14px; color: var(--ink) !important; border: 1px solid var(--border); }
.problem-diagram { margin: 12px 0; }
.problem-svg { width: min(100%,360px); display: block; border: 1px solid var(--border); border-radius: 12px; background: var(--surface); }

/* ── Footer ────────────────────────────────────────────────────── */
.footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  width: min(1200px, calc(100% - 32px));
  margin: 80px auto 0;
  padding: 28px 0 48px;
  color: var(--muted);
  border-top: 1px solid var(--border);
  font-size: .85rem;
}
.footer strong { color: var(--ink); font-weight: 700; display: block; margin-bottom: 4px; }
.footer-links { display: flex; gap: 16px; flex-wrap: wrap; font-weight: 600; }

/* ── Topic browser ─────────────────────────────────────────────── */
.topic-browser { display: grid; grid-template-columns: repeat(2,1fr); gap: 16px; }
.topic-browser-card { padding: 22px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow-sm); }
.topic-browser-card .card-topline a { color: var(--primary); font-weight: 700; }
.topic-browser-card .lesson-list a { border: 1px solid var(--border); color: var(--ink-mid); border-radius: 8px; padding: 6px 10px; font-size: .8rem; font-weight: 600; background: var(--bg); transition: .12s ease; }
.topic-browser-card.blue { background: linear-gradient(145deg,#eff3ff,#fff); border-left: 4px solid #246bfe; }
.topic-browser-card.green { background: linear-gradient(145deg,#ecfdf5,#fff); border-left: 4px solid #13b981; }
.topic-browser-card.purple { background: linear-gradient(145deg,#f5f3ff,#fff); border-left: 4px solid #7c3aed; }
.topic-browser-card.teal { background: linear-gradient(145deg,#ecfeff,#fff); border-left: 4px solid #0891b2; }
.topic-browser-card.blue .subject-card-head span, .topic-browser-card.blue h2 { color: #246bfe; }
.topic-browser-card.green .subject-card-head span, .topic-browser-card.green h2 { color: #13b981; }
.topic-browser-card.purple .subject-card-head span, .topic-browser-card.purple h2 { color: #7c3aed; }
.topic-browser-card.teal .subject-card-head span, .topic-browser-card.teal h2 { color: #0891b2; }
.wide-choice { grid-column: span 2; }
.unit-cta { display: inline-flex; margin-top: 14px; color: var(--primary); font-weight: 700; font-size: .88rem; }
.all-practice-strip { display: flex; align-items: center; justify-content: space-between; gap: 16px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px 24px; }
.quadrant-browser { grid-template-columns: repeat(2,1fr); align-items: stretch; }
.quadrant-browser .topic-browser-card { display: flex; flex-direction: column; }
.subject-card-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 14px; margin-bottom: 12px; }
.subject-card-head span { color: var(--primary); font-size: .72rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; display: block; margin-bottom: 6px; }
.subject-card-head h2 { margin: 0; }
.quadrant-browser .lesson-list { margin-top: 12px; }
.quadrant-browser .lesson-list a { transition: .12s ease; }
.quadrant-browser .lesson-list a:hover { border-color: var(--primary); background: var(--primary-lt); color: var(--primary); }
.topic-link-list { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.topic-link-list .topic-link { display: inline-block; border: 1.5px solid var(--border); border-radius: 20px; background: var(--surface); padding: 5px 12px; color: var(--ink-mid); font-size: .8rem; font-weight: 600; transition: .12s ease; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.topic-link strong { font-size: .8rem; font-weight: 700; }
.topic-link small { display: none; }
.topic-link:hover { transform: translateY(-1px); }
.topic-browser-card.blue .topic-link { border-color: #bfcffe; background: #eef2ff; color: #1d4ed8; }
.topic-browser-card.blue .topic-link:hover { background: #dde6ff; border-color: #246bfe; }
.topic-browser-card.green .topic-link { border-color: #a7f3d0; background: #ecfdf5; color: #065f46; }
.topic-browser-card.green .topic-link:hover { background: #d1fae5; border-color: #13b981; }
.topic-browser-card.purple .topic-link { border-color: #ddd6fe; background: #f5f3ff; color: #5b21b6; }
.topic-browser-card.purple .topic-link:hover { background: #ede9fe; border-color: #7c3aed; }
.topic-browser-card.teal .topic-link { border-color: #99f6e4; background: #f0fdfa; color: #0e7490; }
.topic-browser-card.teal .topic-link:hover { background: #ccfbf1; border-color: #0891b2; }

/* ── Mock exam ─────────────────────────────────────────────────── */
.two-col, .mock-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; align-items: start; }
.mock-grid { grid-template-columns: .85fr .75fr 1fr; }
.timer { font-family: 'Space Grotesk', sans-serif; font-size: clamp(2.8rem,7vw,4.5rem); font-weight: 700; letter-spacing: -.04em; text-align: center; margin: 10px 0 18px; color: var(--ink); }
.mock-stats { display: grid; grid-template-columns: repeat(2,1fr); gap: 10px; margin-bottom: 14px; }
.mock-stats div { background: var(--bg); border-radius: 12px; padding: 12px; border: 1px solid var(--border); }
.mock-stats span { display: block; color: var(--muted); font-size: .78rem; font-weight: 600; }
.mock-stats strong { font-size: 1.25rem; font-weight: 700; }
.mock-links { display: grid; gap: 8px; }
.mock-links a { padding: 12px 14px; border: 1px solid var(--border); border-radius: 12px; background: var(--surface); font-weight: 700; font-size: .88rem; transition: .12s ease; }
.mock-links a:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-lt); }

/* ── Review grid ───────────────────────────────────────────────── */
.review-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 16px; }
.review-grid article { padding: 20px; }

/* ── Dashboard grid ────────────────────────────────────────────── */
.dashboard-grid.refined, .cool-dashboard { display: grid; grid-template-columns: 1.35fr .85fr .85fr; gap: 16px; }
.large { grid-row: span 1; }
.analytics-bars { display: grid; gap: 12px; }
.analytics-bars > div { display: grid; grid-template-columns: 130px 1fr 60px; gap: 10px; align-items: center; font-size: .88rem; }

/* ── Final quiz ────────────────────────────────────────────────── */
.final-quiz-body { display: grid; gap: 12px; margin-top: 16px; }
.final-question { border: 1px solid var(--border); background: var(--surface); border-radius: 14px; padding: 16px; }
.final-question p { line-height: 1.55; margin-bottom: 10px; }
.final-question input { width: 100%; }

/* ══ QUEST STYLES (unchanged logic, updated tokens) ═══════════════ */
.quest-hero { display: grid; grid-template-columns: 1fr 240px; gap: 22px; align-items: center; background: linear-gradient(135deg,#1d4ed8 0%,#2563eb 50%,#7c3aed 100%); border-radius: 20px; padding: 28px 32px; color: #fff; }
.quest-hero h1 { color: #fff; }
.quest-hero-card { background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.22); border-radius: 18px; padding: 18px; color: #fff; }
.quest-hero-card strong { font-size: 1.8rem; display: block; font-weight: 700; }
.quest-hero-card span { color: rgba(255,255,255,.8); font-weight: 600; font-size: .85rem; }
.quest-shell { display: grid; grid-template-columns: 300px 1fr; gap: 20px; align-items: start; }
.quest-sidebar { display: grid; gap: 16px; position: sticky; top: 80px; }
.quest-sidebar > div, .quest-lesson-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow-sm); padding: 18px; }
.quest-subject-tabs, .quest-topic-list { display: grid; gap: 8px; }
.quest-subject-tab, .quest-topic {
  width: 100%; border: 1px solid var(--border); background: var(--surface); border-radius: 14px;
  padding: 11px; text-align: left; cursor: pointer; color: var(--ink); transition: .15s ease;
}
.quest-subject-tab { display: grid; grid-template-columns: 40px 1fr; gap: 6px 10px; align-items: center; }
.quest-subject-tab .unit-icon { width: 40px; height: 40px; margin: 0; border-radius: 12px; }
.quest-subject-tab strong { font-size: .92rem; font-weight: 700; }
.quest-subject-tab small { grid-column: 2; color: var(--muted); font-weight: 600; font-size: .75rem; }
.quest-subject-tab.active { border-color: var(--primary); background: var(--primary-lt); box-shadow: 0 4px 12px var(--primary-glow); }
.quest-topic { display: grid; gap: 3px; }
.quest-topic span { width: max-content; border-radius: 6px; background: var(--bg); color: var(--primary); font-size: .68rem; font-weight: 800; padding: 3px 7px; text-transform: uppercase; letter-spacing: .06em; border: 1px solid #c7d7fb; }
.quest-topic strong { font-size: .9rem; font-weight: 700; }
.quest-topic small { color: var(--muted); line-height: 1.4; font-size: .8rem; }
.quest-topic.current { border-color: var(--cnt); background: #f0fdf4; }
.quest-topic.done { border-color: #a7f3d0; background: #f0fdf4; }
.quest-topic.done span { background: #dcfce7; color: #14532d; border-color: #a7f3d0; }
.quest-topic:disabled { cursor: not-allowed; opacity: .55; background: var(--bg); }
.quest-progress-card { border: 1px solid var(--border); background: var(--bg); border-radius: 14px; padding: 14px; }
.quest-progress-card strong { display: block; font-size: 1.8rem; color: var(--primary); font-weight: 700; font-family: 'Space Grotesk', sans-serif; }
.quest-progress-card span { display: block; color: var(--muted); font-weight: 600; font-size: .8rem; margin-bottom: 10px; }
.quest-lesson-top { display: grid; grid-template-columns: 1fr 180px; gap: 16px; align-items: start; margin-bottom: 16px; }
.quest-roadmap { display: grid; grid-template-columns: repeat(5,minmax(0,1fr)); gap: 8px; margin: 14px 0 18px; }
.quest-roadmap span { border: 1px solid var(--border); background: var(--surface); border-radius: 10px; padding: 9px 10px; text-align: center; color: var(--muted); font-weight: 700; font-size: .78rem; }

/* Quest textbook page */
.quest-textbook-page { display: grid; gap: 14px; margin: 18px 0; }
.quest-book-section { background: var(--surface); border: 1px solid var(--border); border-radius: 18px; padding: 20px; line-height: 1.7; }
.quest-section-label { color: var(--primary) !important; font-size: .72rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; margin-bottom: 7px !important; display: block; }
.quest-book-section h3 { font-size: 1.2rem; margin-bottom: 8px; }
.quest-book-section p { color: var(--ink-mid); margin-bottom: 10px; }
.quest-goal-card { background: linear-gradient(145deg,#eff3ff,#fff); border-color: #c7d7fb; }
.quest-big-idea-card { background: linear-gradient(145deg,#fff,#fffbeb); border-color: #fde68a; }
.quest-visual-card { background: linear-gradient(145deg,#f8fafe,#fff); }
.quest-tools-card { background: linear-gradient(145deg,#f0fdf4,#fff); border-color: #a7f3d0; }
.quest-mistakes-card { background: linear-gradient(145deg,#fff7ed,#fff); border-color: #fed7aa; }
.quest-takeaway-card { background: linear-gradient(145deg,#f5f3ff,#fff); border-color: #ddd6fe; }
.quest-picture-note { border: 1px solid #c7d7fb; background: var(--primary-lt); border-radius: 12px; padding: 12px 14px; margin: 12px 0; }
.quest-picture-note strong { display: block; color: var(--primary); margin-bottom: 4px; font-size: .82rem; }
.quest-picture-note p { margin: 0; color: var(--ink-mid); font-size: .9rem; }
.quest-two-column-list { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 8px; }
.quest-two-column-list > div { border: 1px solid var(--border); background: var(--surface); border-radius: 12px; padding: 12px; }
.quest-two-column-list strong { display: block; color: var(--ink); margin-bottom: 6px; font-weight: 700; }
.quest-two-column-list ul { margin: 0 0 0 16px; padding: 0; }
.quest-two-column-list li { margin: 6px 0; line-height: 1.5; font-size: .88rem; }
.quest-method-steps { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 10px; margin: 12px 0 16px; padding: 0; list-style: none; }
.quest-method-steps li { display: grid; grid-template-columns: 30px 1fr; gap: 8px; align-items: start; border: 1px solid var(--border); background: var(--surface); border-radius: 12px; padding: 12px; }
.quest-method-steps span { display: grid; place-items: center; width: 30px; height: 30px; border-radius: 9px; background: var(--primary-lt); color: var(--primary); font-weight: 800; font-size: .8rem; }
.quest-method-steps p { margin: 3px 0 0 !important; color: var(--ink-mid); line-height: 1.45; font-size: .85rem; }
.quest-practice-set.easy { background: linear-gradient(145deg,#f8faff,#fff); border-color: #c7d7fb; }
.quest-practice-set.skill { background: linear-gradient(145deg,#fffcf0,#fff); border-color: #fde68a; }
.quest-practice-set.contest { background: linear-gradient(145deg,#fdf4ff,#fff); border-color: #e9d5ff; }
.quest-progressive-list { padding-left: 0; list-style: none; }
.quest-progressive-list > li { border: 1px solid var(--border); background: var(--surface); border-radius: 14px; padding: 12px; margin-bottom: 8px; }
.quest-solution-details { margin-top: 8px; border: 1px solid var(--border); border-radius: 12px; background: var(--bg); padding: 10px 12px; }
.quest-solution-details summary { cursor: pointer; color: var(--primary); font-weight: 700; font-size: .85rem; }
.quest-worked-solution { display: grid; gap: 10px; margin-top: 10px; }
.quest-worked-solution .solution-visual { margin: 0; }
.quest-worked-visual { display: grid; gap: 8px; border: 1px solid var(--border); background: var(--bg); border-radius: 12px; padding: 12px; }
.quest-worked-visual > strong { color: var(--primary); font-weight: 700; font-size: .85rem; }
.quest-worked-solution .visual-card, .quest-solution-details .visual-card { max-width: 100%; }
.quest-worked-steps { display: grid; gap: 8px; margin: 0; padding: 0; list-style: none; }
.quest-worked-steps li { border: 1px solid var(--border); background: var(--surface); border-radius: 12px; padding: 11px 13px; }
.quest-worked-steps strong { display: block; color: var(--ink); margin-bottom: 4px; font-weight: 700; font-size: .88rem; }
.quest-worked-steps p { margin: 0 !important; color: var(--ink-mid); line-height: 1.55; font-size: .88rem; }
.quest-mini-steps { display: grid; gap: 6px; margin: 7px 0 0 18px; padding: 0; color: var(--ink-mid); font-size: .88rem; }
.quest-worked-steps li:last-child { border-color: #a7f3d0; background: #f0fdf4; }
.quest-worked-steps li:last-child p { font-weight: 700; color: #14532d; }
.quest-mistake-list { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 8px; margin: 10px 0 0; padding: 0; list-style: none; }
.quest-mistake-list li { border: 1px solid #fed7aa; background: var(--surface); border-radius: 12px; padding: 12px; color: #7c2d12; line-height: 1.5; font-size: .85rem; font-weight: 600; }
.quest-application-list { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 8px; margin: 10px 0 0; padding: 0; list-style: none; }
.quest-application-list li { border: 1px solid #ddd6fe; background: var(--surface); border-radius: 12px; padding: 12px; color: var(--ink-mid); line-height: 1.5; font-size: .85rem; font-weight: 600; transition: .12s ease; }
.quest-application-list li:hover { transform: translateY(-1px); box-shadow: var(--shadow-sm); }
.quest-formula-card ul { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 8px; margin: 10px 0 0; padding: 0; list-style: none; }
.quest-formula-card li { border: 1px solid #c7d7fb; background: var(--surface); border-radius: 12px; padding: 12px; color: var(--ink-mid); line-height: 1.5; font-weight: 700; font-size: .85rem; }
.quest-unit-lock { display: inline-flex; align-items: center; border: 1px solid var(--border); border-radius: 999px; background: var(--bg); color: var(--muted); font-weight: 700; font-size: .85rem; padding: 9px 14px; }
.quest-actions { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-top: 16px; }
.quest-check-card { margin-top: 18px; border: 1px solid var(--border); border-radius: 20px; background: var(--surface); padding: 18px; box-shadow: var(--shadow-sm); }
.quest-check-head { display: flex; justify-content: space-between; gap: 12px; align-items: start; margin-bottom: 12px; }
.quest-check-head h3 { margin: 0; }
.quest-check-head span { background: var(--bg); color: var(--muted); border-radius: 999px; padding: 5px 10px; font-weight: 700; font-size: .82rem; border: 1px solid var(--border); }
.quest-question-list { display: grid; gap: 10px; }
.quest-question { display: grid; grid-template-columns: 38px 1fr minmax(140px,200px); gap: 10px; align-items: start; border: 1px solid var(--border); background: var(--surface); border-radius: 16px; padding: 13px; }
.quest-question > span { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 11px; background: var(--bg); color: var(--primary); font-weight: 800; font-size: .8rem; }
.quest-question p { line-height: 1.55; margin: 5px 0 0; font-size: .92rem; }
.quest-question input { width: 100%; }
.quest-result { margin-top: 12px; border-radius: 12px; padding: 12px 14px; line-height: 1.6; font-size: .88rem; }
.quest-result.correct { background: #f0fdf4; border: 1px solid #bbf7d0; color: #14532d; }
.quest-result.incorrect { background: #fff7ed; border: 1px solid #fed7aa; color: #7c2d12; }
.quest-result strong { font-size: 1.05rem; }
.quest-result ol { margin: 6px 0 0 18px; padding: 0; }
.quest-question.answer-correct { border-color: #a7f3d0; background: #f0fdf4; }
.quest-question.answer-incorrect { border-color: #fed7aa; background: #fff7ed; }
.quest-answer-note { grid-column: 2/-1; border-radius: 10px; padding: 9px 12px; background: var(--bg); color: var(--ink-mid); line-height: 1.5; font-size: .85rem; border: 1px solid var(--border); }
.answer-correct .quest-answer-note { background: #f0fdf4; color: #14532d; border-color: #bbf7d0; }
.answer-incorrect .quest-answer-note { background: #fff7ed; color: #7c2d12; border-color: #fed7aa; }
.quest-difficulty-badge { display: inline-flex; align-items: center; border-radius: 6px; padding: 3px 8px; margin: 0 6px 6px 0; font-size: .68rem; font-weight: 800; text-transform: uppercase; letter-spacing: .06em; background: var(--primary-lt); color: var(--primary); border: 1px solid #c7d7fb; }
.quest-difficulty-badge.intermediate { background: #fffbeb; color: #92400e; border-color: #fde68a; }
.quest-difficulty-badge.challenging { background: #fdf4ff; color: #6b21a8; border-color: #e9d5ff; }
.quest-question-meta { display: flex; align-items: center; gap: 5px; flex-wrap: wrap; margin-bottom: 2px; }
.quest-question-meta small { color: var(--muted); font-weight: 600; font-size: .78rem; }
.learning-quest-page .math-symbol { font-weight: 700; }
.quest-empty-step, .quest-choice-empty { border: 1px dashed var(--border); background: var(--surface); border-radius: 16px; padding: 18px; color: var(--ink-mid); line-height: 1.6; }
.quest-empty-step strong { display: block; color: var(--ink); margin-bottom: 5px; font-weight: 700; }
.quest-choice-empty { display: grid; gap: 10px; min-height: 200px; align-content: center; }
.quest-concept-layout { display: grid; grid-template-columns: minmax(0,.9fr) minmax(280px,1.1fr); gap: 16px; align-items: start; }
.quest-concept-layout > .visual-card { margin: 0; }
.quest-two-column-list { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 8px; }
.quest-unit-map { display: flex; gap: 8px; overflow-x: auto; padding: 8px 2px 12px; margin: 6px 0 12px; scroll-snap-type: x proximity; }
.quest-map-node { min-width: 140px; max-width: 180px; border: 1px solid var(--border); background: var(--surface); border-radius: 14px; padding: 11px; text-align: left; display: grid; grid-template-columns: 32px 1fr; gap: 8px; align-items: center; cursor: pointer; scroll-snap-align: start; transition: .15s ease; color: var(--ink); }
.quest-map-node span { display: grid; place-items: center; width: 32px; height: 32px; border-radius: 10px; background: var(--bg); color: var(--primary); font-weight: 800; font-size: .78rem; }
.quest-map-node strong { font-size: .8rem; line-height: 1.25; font-weight: 700; }
.quest-map-node.active { border-color: var(--primary); background: var(--primary-lt); box-shadow: 0 4px 12px var(--primary-glow); }
.quest-map-node.done { border-color: #a7f3d0; background: #f0fdf4; }
.quest-map-node.done span { background: #dcfce7; color: #14532d; }
.quest-map-node:disabled { opacity: .5; cursor: not-allowed; }
.quest-skill-board { display: grid; grid-template-columns: repeat(5,minmax(0,1fr)); gap: 10px; margin: 12px 0 14px; }
.quest-skill-card { border: 1px solid var(--border); background: var(--surface); border-radius: 14px; padding: 14px; min-height: 130px; }
.quest-skill-card span { display: grid; place-items: center; width: 30px; height: 30px; border-radius: 10px; background: var(--bg); color: var(--primary); font-weight: 800; margin-bottom: 8px; font-size: .78rem; }
.quest-skill-card strong { display: block; margin-bottom: 5px; font-weight: 700; font-size: .88rem; }
.quest-skill-card p { color: var(--muted); line-height: 1.45; margin: 0; font-size: .82rem; }
.quest-skill-card.active { border-color: var(--primary); background: var(--primary-lt); }
.quest-skill-card.done { border-color: #a7f3d0; background: #f0fdf4; }
.quest-skill-card.unlocked { border-color: #ddd6fe; background: #f5f3ff; }
.quest-coach-work { margin-top: 12px; }
.quest-coach-work > strong { display: block; margin-bottom: 8px; color: var(--ink); font-weight: 700; }
.quest-coach-work .visual-card { background: var(--surface); }
.quest-coming-soon { max-width: 520px; margin: 40px auto; text-align: center; }
.quest-coming-soon-inner { padding: 20px; }
.quest-coming-soon-icon { font-size: 2.5rem; margin-bottom: 10px; }
.quest-coming-soon-inner h2 { font-size: 1.4rem; }
.quest-coming-soon-inner p { color: var(--muted); line-height: 1.65; }
.quest-coming-soon-actions { display: flex; gap: 10px; justify-content: center; margin-top: 16px; flex-wrap: wrap; }

/* ── LEARNING QUEST: 3-TAB REDESIGN ─────────────────────────── */
.ql2-header { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 20px 24px; background: linear-gradient(135deg,#1d4ed8,#2563eb 60%,#7c3aed); border-radius: 18px; color: #fff; margin-bottom: 0; }
.ql2-header-text { flex: 1; min-width: 0; }
.ql2-eyebrow { font-size: .68rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: rgba(255,255,255,.6); margin-bottom: 4px; }
.ql2-title { font-size: clamp(1.25rem,2.2vw,1.6rem); font-weight: 700; color: #fff; margin: 0; }
.ql2-header-right { display: flex; flex-direction: column; align-items: center; gap: 5px; flex-shrink: 0; }
.ql2-done-badge { font-size: .68rem; font-weight: 700; background: rgba(255,255,255,.18); border: 1px solid rgba(255,255,255,.28); border-radius: 20px; padding: 2px 8px; color: rgba(255,255,255,.8); white-space: nowrap; }
.ql2-done-badge.done { background: rgba(34,197,94,.3); border-color: rgba(34,197,94,.5); color: #bbf7d0; }
.ql2-tabs { display: flex; gap: 4px; padding: 10px 0 0; border-bottom: 2px solid var(--border); margin-bottom: 20px; }
.ql2-tab { background: none; border: none; padding: 8px 16px; font-size: .88rem; font-weight: 600; color: var(--muted); cursor: pointer; border-bottom: 2px solid transparent; margin-bottom: -2px; transition: color .15s, border-color .15s; border-radius: 8px 8px 0 0; font-family: inherit; }
.ql2-tab:hover { color: var(--primary); background: var(--primary-lt); }
.ql2-tab.active { color: var(--primary); border-bottom-color: var(--primary); background: var(--primary-lt); }
.ql2-tab-content { min-height: 200px; }
.ql2-concept-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; align-items: start; margin-bottom: 20px; }
.ql2-concept-text h3 { font-size: 1rem; font-weight: 700; color: var(--ink); margin-bottom: 8px; }
.ql2-big-idea { color: var(--ink-mid); line-height: 1.7; font-size: .95rem; margin: 0; }
.ql2-concept-visual { display: flex; justify-content: center; }
.ql2-method-block { margin-bottom: 18px; }
.ql2-method-block h3 { font-size: 1rem; font-weight: 700; color: var(--ink); margin-bottom: 12px; }
.ql2-next-row { display: flex; justify-content: flex-end; padding-top: 16px; margin-top: 8px; border-top: 1px solid var(--border); }
.ql2-practice { display: grid; gap: 14px; }
.ql2-quiz-intro { display: flex; gap: 16px; align-items: flex-start; justify-content: space-between; background: linear-gradient(145deg,#eff3ff,#fff); border: 1px solid #c7d7fb; border-radius: 16px; padding: 20px 22px; margin-bottom: 16px; flex-wrap: wrap; }
.ql2-quiz-intro h3 { font-size: 1.05rem; font-weight: 700; color: var(--ink); margin-bottom: 6px; }
.ql2-quiz-intro p { color: var(--ink-mid); line-height: 1.6; margin: 0; font-size: .9rem; }
.ql2-quiz-actions { display: flex; gap: 8px; flex-shrink: 0; flex-wrap: wrap; align-items: center; }
.ql2-unit-status { margin-top: 4px; }
@media (max-width: 600px) {
  .ql2-concept-row { grid-template-columns: 1fr; }
  .ql2-tab { padding: 7px 10px; font-size: .8rem; }
  .ql2-quiz-intro { flex-direction: column; }
}

/* OLD QUEST LESSON STYLES (kept for quiz/check panels) */
.ql-header { display: grid; grid-template-columns: 1fr auto; gap: 18px; align-items: start; margin-bottom: 18px; padding: 24px 28px; background: linear-gradient(135deg,#1d4ed8,#2563eb 50%,#7c3aed); border-radius: 20px; color: #fff; }
.ql-eyebrow { font-size: .7rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: rgba(255,255,255,.65); margin-bottom: 5px; }
.ql-title { font-size: clamp(1.4rem,2.5vw,1.9rem); font-weight: 700; color: #fff; margin-bottom: 7px; }
.ql-desc { color: rgba(255,255,255,.78); line-height: 1.6; margin: 0; font-size: .92rem; }
.ql-progress { display: flex; flex-direction: column; align-items: center; gap: 5px; background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.18); border-radius: 14px; padding: 12px 16px; }
.ql-progress-text { text-align: center; }
.ql-progress-text strong { display: block; font-size: 1.2rem; color: #fff; font-weight: 700; }
.ql-progress-text span { font-size: .68rem; color: rgba(255,255,255,.65); font-weight: 700; text-transform: uppercase; letter-spacing: .06em; }
.ql-roadmap { display: flex; align-items: center; gap: 5px; margin-bottom: 20px; overflow-x: auto; padding: 2px 2px 8px; }
.ql-road-item { display: flex; flex-direction: column; align-items: center; gap: 2px; padding: 8px 12px; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; text-decoration: none; color: var(--muted); font-weight: 700; font-size: .74rem; white-space: nowrap; transition: .12s ease; flex-shrink: 0; }
.ql-road-item:hover { background: var(--primary-lt); border-color: #c7d7fb; color: var(--primary); }
.ql-road-icon { font-size: 1rem; }
.ql-road-arrow { color: var(--border); font-size: .8rem; flex-shrink: 0; }
.ql-section { margin-bottom: 24px; }
.ql-section-label { display: inline-flex; align-items: center; gap: 7px; margin-bottom: 12px; font-size: .7rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; color: var(--primary); }
.ql-section-label span { display: grid; place-items: center; width: 24px; height: 24px; border-radius: 7px; background: var(--primary); color: #fff; font-size: .75rem; font-weight: 800; }
.ql-goal-card { display: flex; gap: 12px; align-items: flex-start; background: linear-gradient(145deg,#eff3ff,#fff); border: 1px solid #c7d7fb; border-radius: 16px; padding: 16px 18px; margin-bottom: 16px; }
.ql-goal-icon { font-size: 1.4rem; flex-shrink: 0; line-height: 1; }
.ql-goal-card h3 { font-size: .95rem; font-weight: 700; color: var(--primary); margin-bottom: 5px; }
.ql-goal-card p { color: var(--ink-mid); line-height: 1.6; margin: 0; font-size: .9rem; }
.ql-concept-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-bottom: 18px; align-items: start; }
.ql-concept-text h3 { font-size: 1rem; font-weight: 700; color: var(--ink); margin-bottom: 8px; }
.ql-big-idea { color: var(--ink-mid); line-height: 1.7; font-size: .95rem; margin-bottom: 12px; }
.ql-mental-picture { background: #fffbeb; border-left: 3px solid #d97706; border-radius: 0 10px 10px 0; padding: 10px 13px; }
.ql-mental-picture strong { display: block; font-size: .78rem; font-weight: 800; color: #92400e; margin-bottom: 4px; }
.ql-mental-picture p { color: #78350f; margin: 0; line-height: 1.55; font-size: .87rem; }
.ql-why-card { background: linear-gradient(145deg,#f5f3ff,#fff); border: 1px solid #ddd6fe; border-radius: 14px; padding: 16px; }
.ql-why-card h3 { font-size: .95rem; font-weight: 700; color: #5b21b6; margin-bottom: 6px; }
.ql-why-card p { color: var(--ink-mid); line-height: 1.65; margin: 0; font-size: .9rem; }
.ql-method-section h3 { font-size: 1rem; font-weight: 700; color: var(--ink); margin-bottom: 12px; }
.ql-worked-example { background: linear-gradient(145deg,#fffbeb,#fff); border: 1px solid #fde68a; border-left: 4px solid #f59e0b; border-radius: 14px; padding: 16px 18px; margin: 16px 0; }
.ql-worked-header { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; }
.ql-worked-icon { color: #d97706; font-size: 1rem; }
.ql-worked-label { font-size: .78rem; font-weight: 800; letter-spacing: .07em; text-transform: uppercase; color: #d97706; }
.ql-worked-problem { font-style: italic; color: var(--ink); line-height: 1.6; margin: 0 0 10px; font-size: .9rem; font-weight: 500; }
.ql-worked-steps { margin: 0 0 12px; padding-left: 20px; display: grid; gap: 6px; }
.ql-worked-steps li { font-size: .88rem; color: var(--ink-mid); line-height: 1.6; }
.ql-worked-insight { background: #fff7ed; border: 1px solid #fed7aa; border-radius: 10px; padding: 10px 14px; font-size: .87rem; color: var(--ink); line-height: 1.6; }
.ql-worked-insight strong { color: #c2410c; }
.ql-reference-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 16px 0; }
.ql-ref-card { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 14px; }
.ql-formula-card { border-color: #a7f3d0; background: linear-gradient(145deg,#f0fdf4,#fff); }
.ql-tips-card { border-color: #c7d7fb; background: linear-gradient(145deg,#eff3ff,#fff); }
.ql-ref-card h4 { font-size: .76rem; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); margin-bottom: 8px; }
.ql-ref-card ul { margin: 0; padding-left: 16px; display: grid; gap: 5px; }
.ql-ref-card li { color: var(--ink-mid); line-height: 1.5; font-size: .87rem; }
.ql-mistakes-card { background: linear-gradient(145deg,#fff7ed,#fff); border: 1px solid #fed7aa; border-radius: 14px; padding: 14px; margin-top: 2px; }
.ql-mistakes-card h4 { font-size: .76rem; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; color: #c2410c; margin-bottom: 10px; }
.ql-mistakes-grid { display: grid; gap: 7px; }
.ql-mistake-item { display: flex; gap: 8px; align-items: flex-start; }
.ql-mistake-x { display: grid; place-items: center; width: 20px; height: 20px; border-radius: 6px; background: #fee2e2; color: #dc2626; font-size: .72rem; font-weight: 800; flex-shrink: 0; margin-top: 1px; }
.ql-mistake-item p { color: #7c2d12; line-height: 1.5; margin: 0; font-size: .87rem; }
.qps-section { background: var(--surface); border: 1px solid var(--border); border-radius: 18px; padding: 18px; margin-bottom: 14px; }
.qps-easy { border-color: #c7d7fb; background: linear-gradient(180deg,#f8faff,#fff); }
.qps-skill { border-color: #a7f3d0; background: linear-gradient(180deg,#f0fdf4,#fff); }
.qps-contest { border-color: #ddd6fe; background: linear-gradient(180deg,#f5f3ff,#fff); }
.qps-header { display: flex; gap: 10px; align-items: flex-start; margin-bottom: 14px; }
.qps-icon { font-size: 1.4rem; line-height: 1; flex-shrink: 0; }
.qps-title { font-size: .95rem; font-weight: 700; color: var(--ink); margin-bottom: 3px; }
.qps-intro { color: var(--muted); font-size: .84rem; line-height: 1.5; margin: 0; }
.qps-problems { display: grid; gap: 12px; }
.qps-problem { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 14px; transition: .12s ease; }
.qps-problem:hover { box-shadow: var(--shadow-sm); }
.qps-problem-header { display: flex; align-items: center; gap: 7px; margin-bottom: 8px; flex-wrap: wrap; }
.qps-num { display: grid; place-items: center; width: 26px; height: 26px; border-radius: 8px; background: var(--bg); color: var(--primary); font-size: .76rem; font-weight: 800; flex-shrink: 0; border: 1px solid var(--border); }
.qps-concept { font-size: .7rem; font-weight: 700; color: var(--muted); background: var(--bg); border-radius: 6px; padding: 2px 7px; border: 1px solid var(--border); }
.qps-text { color: var(--ink); line-height: 1.65; font-size: .95rem; margin-bottom: 10px; font-weight: 500; }
.qps-reveal { margin-top: 4px; }
.qps-reveal summary { cursor: pointer; list-style: none; display: inline-flex; }
.qps-reveal summary::-webkit-details-marker { display: none; }
.qps-reveal-btn { display: inline-flex; align-items: center; gap: 5px; padding: 6px 12px; background: var(--bg); border: 1px solid var(--border); border-radius: 8px; font-size: .78rem; font-weight: 700; color: var(--muted); transition: .12s ease; }
.qps-reveal[open] .qps-reveal-btn { background: var(--primary); color: #fff; border-color: var(--primary); }
.qps-solution { margin-top: 12px; border-top: 1px solid var(--border-lt); padding-top: 12px; }
.qws-wrap { display: grid; grid-template-columns: minmax(160px,240px) 1fr; gap: 14px; align-items: start; }
.qws-steps { display: grid; gap: 8px; }
.qws-step { display: flex; gap: 8px; align-items: flex-start; }
.qws-step-num { display: grid; place-items: center; width: 24px; height: 24px; border-radius: 7px; background: var(--bg); color: var(--primary); font-size: .74rem; font-weight: 800; flex-shrink: 0; margin-top: 1px; border: 1px solid #c7d7fb; }
.qws-step strong { display: block; font-size: .85rem; font-weight: 700; color: var(--ink); margin-bottom: 2px; }
.qws-step p { margin: 0; color: var(--ink-mid); line-height: 1.55; font-size: .85rem; }
.qws-mini { margin: 5px 0 0 16px; padding: 0; display: grid; gap: 3px; }
.qws-mini li { color: var(--ink-mid); line-height: 1.55; font-size: .85rem; }
.qws-answer { background: #f0fdf4; border: 1px solid #a7f3d0; border-radius: 10px; padding: 9px 12px; }
.qws-answer .qws-step-num { background: #dcfce7; color: #14532d; border-color: #a7f3d0; }
.qws-answer strong { color: #14532d; }
.ql-contest-intro { margin-bottom: 14px; }
.ql-contest-intro h3 { font-size: 1rem; font-weight: 700; color: var(--ink); margin-bottom: 6px; }
.ql-contest-intro p { color: var(--muted); line-height: 1.6; margin: 0; font-size: .9rem; }
.ql-applications-grid { display: grid; grid-template-columns: repeat(auto-fill,minmax(180px,1fr)); gap: 8px; margin-bottom: 16px; }
.ql-app-card { background: var(--surface); border: 1px solid #ddd6fe; border-radius: 12px; padding: 12px; display: flex; gap: 8px; align-items: flex-start; }
.ql-app-num { display: grid; place-items: center; width: 22px; height: 22px; border-radius: 6px; background: #f5f3ff; color: #7c3aed; font-size: .68rem; font-weight: 800; flex-shrink: 0; }
.ql-app-card p { margin: 0; color: var(--ink-mid); line-height: 1.5; font-size: .85rem; }
.ql-takeaway-card { display: flex; gap: 14px; align-items: flex-start; background: linear-gradient(145deg,#fffbeb,#fff); border: 2px solid #fde68a; border-radius: 18px; padding: 18px; }
.ql-takeaway-icon { font-size: 1.6rem; line-height: 1; flex-shrink: 0; }
.ql-takeaway-card h3 { font-size: .95rem; font-weight: 700; color: #92400e; margin-bottom: 6px; }
.ql-takeaway-card p { color: #78350f; line-height: 1.65; margin: 0; font-size: .9rem; }
.ql-mastery-intro { display: flex; justify-content: space-between; gap: 14px; align-items: flex-start; background: linear-gradient(145deg,#eff3ff,#fff); border: 1px solid #c7d7fb; border-radius: 16px; padding: 18px; margin-bottom: 12px; flex-wrap: wrap; }
.ql-mastery-intro h3 { font-size: .95rem; font-weight: 700; color: var(--ink); margin-bottom: 5px; }
.ql-mastery-intro p { color: var(--muted); line-height: 1.55; margin: 0; font-size: .87rem; }
.ql-mastery-actions { display: flex; gap: 8px; flex-wrap: wrap; flex-shrink: 0; }
.ql-unit-status { text-align: center; padding: 8px 0; }
.ql-unit-ready { display: inline-flex; align-items: center; gap: 7px; background: #f0fdf4; border: 1px solid #a7f3d0; border-radius: 10px; padding: 8px 14px; }
.ql-unit-ready p { margin: 0; color: #14532d; font-weight: 700; font-size: .88rem; }
.ql-unit-lock-note { color: var(--muted); font-size: .85rem; font-weight: 700; }
.link-button { background: none; border: none; color: var(--primary); font-weight: 700; cursor: pointer; text-decoration: underline; padding: 0; font-size: inherit; }

/* ══ MOCK EXAM ══════════════════════════════════════════════════════ */
.mock-lab-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 20px; align-items: stretch; }
.mock-control-card { background: linear-gradient(145deg,#fff,#eef5ff 60%,#f0fdf4); }
.mock-kicker { display: inline-flex; border-radius: 8px; background: #f0fdf4; color: #14532d; font-weight: 800; padding: 6px 12px; margin-bottom: 12px; font-size: .8rem; }
.mock-ramp { display: grid; grid-template-columns: repeat(3,1fr); gap: 8px; margin: 16px 0; }
.mock-ramp span { border: 1px solid #c7d7fb; background: var(--surface); border-radius: 12px; padding: 10px; font-weight: 800; color: var(--ink); text-align: center; font-size: .88rem; }
.mock-main-timer { font-family: 'Space Grotesk', sans-serif; font-size: clamp(3rem,7vw,4.5rem); text-align: left; margin: 16px 0 10px; color: var(--ink); font-weight: 700; letter-spacing: -.04em; }
.mock-toolbar { display: flex; gap: 8px; flex-wrap: wrap; }
.mock-insight-strip { display: grid; grid-template-columns: repeat(2,1fr); gap: 10px; margin: 14px 0; }
.mock-insight-strip div { border-radius: 14px; background: var(--bg); border: 1px solid var(--border); padding: 14px; }
.mock-insight-strip strong { display: block; font-size: 1.4rem; font-weight: 700; }
.mock-insight-strip span { color: var(--muted); font-size: .78rem; font-weight: 600; }
.mock-test-panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow-sm); }
.mock-test-top { display: flex; justify-content: space-between; gap: 14px; align-items: center; margin-bottom: 16px; }
.mock-test-top h2 { margin-bottom: 0; }
.mock-progress { height: 8px; border-radius: 999px; background: var(--bg); overflow: hidden; margin-bottom: 18px; border: 1px solid var(--border); }
.mock-progress span { display: block; height: 100%; width: 0; background: linear-gradient(90deg,var(--primary),var(--cnt)); border-radius: inherit; transition: width .2s ease; }
.mock-question-list { display: grid; gap: 14px; }
.mock-empty-state { border: 1px dashed var(--border); border-radius: 18px; background: var(--surface); padding: 32px; text-align: center; color: var(--muted); }
.mock-empty-state h3 { color: var(--ink); }
.mock-question { border: 1px solid var(--border); border-radius: 18px; background: var(--surface); padding: 16px; box-shadow: var(--shadow-sm); }
.mock-question-head { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 8px; }
.mock-question-head strong { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 10px; background: var(--bg); color: var(--primary); font-weight: 800; font-size: .8rem; border: 1px solid #c7d7fb; }
.mock-question-head span { color: var(--muted); font-weight: 700; font-size: .82rem; }
.mock-question p { font-size: 1rem; line-height: 1.65; margin-bottom: 12px; font-weight: 500; }
.mock-question label { display: grid; gap: 5px; color: var(--muted); font-weight: 700; font-size: .85rem; }
.mock-question input { max-width: 340px; }
.mock-result-card { display: grid; grid-template-columns: .8fr 1.2fr; gap: 20px; align-items: start; background: linear-gradient(145deg,#fff,#f0fdf4); border: 1px solid #a7f3d0; border-radius: var(--radius); padding: 22px; }
.mock-result-card p { color: var(--muted); line-height: 1.7; }
.mock-review-list { display: grid; gap: 12px; }
.mock-review-item { background: var(--surface); border: 1px solid var(--border); border-radius: 16px; padding: 16px; }
.mock-review-item.correct { border-color: #a7f3d0; }
.mock-review-item.incorrect { border-color: #fed7aa; }
.mock-review-item div:first-child { display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap; margin-bottom: 8px; }
.mock-review-item span { color: var(--muted); font-size: .82rem; font-weight: 700; }
.mock-review-item ol { margin: 10px 0 0; padding-left: 20px; color: var(--ink-mid); line-height: 1.65; }
.mock-review-item .problem-svg { max-width: 260px; margin: 8px 0; }

/* ── Benchmark / account ───────────────────────────────────────── */
.benchmark-form, .mock-form { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.account-card { border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow-sm); padding: 24px; background: var(--surface); }
.google-user { display: flex; align-items: center; gap: 6px; font-weight: 700; font-size: .8rem; white-space: nowrap; }
.google-user img { width: 24px; height: 24px; border-radius: 50%; }
.google-user b { display: none; }

/* ── Term support / first move ─────────────────────────────────── */
.term-support, .first-move { border: 1px solid var(--border); border-radius: 12px; background: var(--bg); padding: 12px 14px; margin: 8px 0; }
.term-support div, .first-move { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.term-support strong, .first-move strong { font-weight: 700; color: var(--ink); margin-bottom: 4px; display: block; }
.term-support p, .first-move p { color: var(--muted); font-size: .88rem; line-height: 1.5; margin: 0; }

/* ── Unlock board / challenge board ────────────────────────────── */
.unlock-board, .challenge-board { display: grid; grid-template-columns: repeat(auto-fill,minmax(160px,1fr)); gap: 8px; margin-top: 12px; }
.unlock-item, .challenge-item { border: 1px solid var(--border); border-radius: 12px; background: var(--bg); padding: 10px 12px; font-size: .82rem; }
.unlock-item.unlocked, .challenge-item { border-color: #c7d7fb; background: var(--primary-lt); color: var(--primary-dk); }

/* ═══════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════ */
@media(max-width:1100px) {
  .quest-skill-board { grid-template-columns: repeat(3,minmax(0,1fr)); }
  .quest-method-steps { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .quest-mistake-list, .quest-application-list, .quest-formula-card ul { grid-template-columns: 1fr 1fr; }
  .dashboard-grid.refined, .cool-dashboard { grid-template-columns: 1fr 1fr; }
  .mock-lab-grid { grid-template-columns: 1fr; }
}
@media(max-width:980px) {
  .nav-links { display: none; }
  .menu-toggle { display: block; }
  .nav-links.open { display: flex; position: absolute; left: 16px; right: 16px; top: 64px; padding: 16px; flex-direction: column; align-items: flex-start; background: var(--surface); border: 1px solid var(--border); border-radius: 16px; box-shadow: var(--shadow); z-index: 200; }
  .dashboard-hero, .dashboard-grid.refined, .cool-dashboard, .two-col, .practice-layout, .mock-grid, .mock-result-card, .quest-hero { grid-template-columns: 1fr; }
  .unit-grid, .mastery-grid, .category-grid { grid-template-columns: repeat(2,1fr); }
  .scratchpad-card { position: static; }
  .footer { flex-direction: column; text-align: center; }
  .quest-shell { grid-template-columns: 1fr; }
  .quest-sidebar { position: static; }
  .ql-concept-grid, .ql-reference-grid, .qws-wrap { grid-template-columns: 1fr; }
  .quest-concept-layout { grid-template-columns: 1fr; }
}
@media(max-width:760px) {
  .quest-two-column-list, .quest-mistake-list, .quest-application-list, .quest-formula-card ul, .ql-mastery-intro { grid-template-columns: 1fr; }
  .quest-roadmap { grid-template-columns: 1fr 1fr; }
  .review-grid { grid-template-columns: 1fr; }
}
@media(max-width:640px) {
  .unit-grid, .mastery-grid, .category-grid, .practice-choice-grid { grid-template-columns: 1fr; }
  .mini-stats, .mock-stats, .detail-grid, .mock-insight-strip { grid-template-columns: 1fr; }
  .subhero { padding: 24px; }
  .dashboard-hero, .section { margin: 28px auto; }
  .problem-card { padding: 18px 18px 18px 22px; }
  .pcv2-chip { padding: 5px 10px; font-size: .76rem; }
  .pcv2-topic-dropdown { min-width: 160px; }
  .ql-roadmap .ql-road-arrow { display: none; }
  .quest-skill-board { grid-template-columns: 1fr; }
  .quest-skill-card { display: grid; grid-template-columns: 36px 1fr; gap: 8px 10px; align-items: start; min-height: 0; }
  .quest-skill-card span { margin: 0; }
}
@media(max-width:400px) {
  .quest-roadmap { grid-template-columns: 1fr; }
}

/* Learning quest specific page overrides */
.learning-quest-page .quest-shell { max-width: 980px; grid-template-columns: 1fr; }
.learning-quest-page .quest-sidebar { position: static; display: grid; grid-template-columns: 1fr; }
.learning-quest-page .quest-subject-tabs { grid-template-columns: repeat(4,minmax(0,1fr)); }
.learning-quest-page .quest-topic-list { grid-template-columns: 1fr; gap: 7px; }
.learning-quest-page .quest-topic { grid-template-columns: auto minmax(0,1fr); gap: 5px 10px; align-items: start; }
.learning-quest-page .quest-topic span { grid-row: 1/3; }
.learning-quest-page .quest-topic small { grid-column: 2; }
.learning-quest-page .quest-unit-map { display: grid; grid-template-columns: 1fr; overflow: visible; scroll-snap-type: none; padding: 0; margin: 14px 0; }
.learning-quest-page .quest-map-node { min-width: 0; max-width: none; }
@media(max-width:860px) { .learning-quest-page .quest-subject-tabs { grid-template-columns: 1fr 1fr; } }
@media(max-width:560px) { .learning-quest-page .quest-subject-tabs { grid-template-columns: 1fr; } }

/* Misc utility */
.hidden { display: none; }
.math-times { font-size: 1.05em; font-weight: 800; color: var(--ink); padding: 0 .05em; }
.answer-row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-top: 18px; }
.hint-actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--border-lt); }
.practice-controls { background: var(--bg); padding: 12px; border-radius: 14px; margin-bottom: 14px; display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.practice-controls label { font-weight: 700; color: var(--muted); font-size: .85rem; }
.review-attempt-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin: 10px 0; }
.review-attempt-grid > div { background: var(--bg); border: 1px solid var(--border); border-radius: 12px; padding: 10px; }
.review-attempt-grid ol { margin: 6px 0 0 18px; padding: 0; font-size: .87rem; }

/* ── Practice identity bar (replaces subhero on practice pages) ── */
.practice-id-bar {
  width: min(1200px, calc(100% - 32px));
  margin: 20px auto 0;
  padding: 14px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow-sm);
}
.practice-id-inner {
  display: flex;
  align-items: center;
  gap: 14px;
}
.practice-id-icon {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 13px;
  background: linear-gradient(135deg, var(--primary), #7c3aed);
  color: #fff;
  font-size: 1.1rem;
  font-weight: 800;
  flex-shrink: 0;
}
body[data-topic="algebra"]       .practice-id-icon { background: linear-gradient(135deg, var(--alg), #60a5fa); }
body[data-topic="counting"]      .practice-id-icon { background: linear-gradient(135deg, var(--cnt), #34d399); }
body[data-topic="geometry"]      .practice-id-icon { background: linear-gradient(135deg, var(--geo), #a78bfa); }
body[data-topic="number-theory"] .practice-id-icon { background: linear-gradient(135deg, var(--num), #22d3ee); }
.practice-id-subject {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 2px;
  letter-spacing: -.01em;
}
.practice-id-topics {
  font-size: .78rem;
  color: var(--muted);
  margin: 0;
  font-weight: 600;
}
.practice-layout { margin-top: 20px !important; }

/* ── Problem label (replaces h2 "Practice problem") ─────────────── */
.problem-label {
  font-size: .7rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--muted);
  margin: 0 0 10px;
}

/* ═══════════════════════════════════════════════════════════════
   WORKED SOLUTION — structured step layout
   ═══════════════════════════════════════════════════════════════ */
.sol-wrap { display: grid; gap: 14px; }
.sol-label {
  font-size: .68rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--muted);
  margin: 0 0 6px;
}
.sol-header { }
.sol-idea {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  background: var(--primary-lt);
  border: 1px solid #c7d7fb;
  border-radius: 12px;
  padding: 12px 14px;
}
.sol-idea-icon { font-size: 1.2rem; line-height: 1; flex-shrink: 0; }
.sol-idea-text { margin: 0; color: var(--ink-mid); line-height: 1.55; font-size: .9rem; font-weight: 500; }
.sol-visual { }
.sol-steps {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 16px;
}
.sol-step-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}
.sol-step {
  display: flex;
  gap: 10px;
  align-items: flex-start;
}
.sol-step-num {
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  border-radius: 7px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--primary);
  font-size: .72rem;
  font-weight: 800;
  flex-shrink: 0;
  margin-top: 2px;
}
.sol-step p {
  margin: 0;
  color: var(--ink-mid);
  line-height: 1.6;
  font-size: .9rem;
}
.sol-answer {
  display: flex;
  gap: 10px;
  align-items: center;
  background: #f0fdf4;
  border: 1.5px solid #a7f3d0;
  border-radius: 12px;
  padding: 12px 16px;
}
.sol-answer-icon {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: #dcfce7;
  color: #14532d;
  font-size: .9rem;
  font-weight: 800;
  flex-shrink: 0;
}
.sol-answer-value {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
  color: #14532d;
  font-family: 'Space Grotesk', sans-serif;
}
.sol-trap {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  background: #fff7ed;
  border: 1px solid #fed7aa;
  border-radius: 10px;
  padding: 10px 13px;
  font-size: .85rem;
  color: #7c2d12;
}
.sol-trap p { margin: 0; line-height: 1.55; }

/* Solution guide panel (static, no AI) */
.sol-guide-panel {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 16px;
}
.sol-steps-list {
  margin: 0;
  padding: 0;
  list-style: decimal inside;
  display: grid;
  gap: 8px;
}
.sol-steps-list .sol-step {
  display: list-item;
  font-size: .9rem;
  color: var(--ink-mid);
  line-height: 1.6;
  padding: 6px 10px;
  border-radius: 8px;
}
.sol-steps-list .sol-step-idea {
  list-style: none;
  background: var(--primary-lt);
  border-left: 3px solid var(--primary);
  font-weight: 600;
  color: var(--primary-dark, #1d4ed8);
  padding: 7px 11px;
}
.sol-steps-list .sol-step-trap {
  list-style: none;
  background: #fff7ed;
  border-left: 3px solid #f59e0b;
  color: #7c2d12;
  font-size: .85rem;
  padding: 7px 11px;
}
.sol-steps-list .sol-step-answer {
  list-style: none;
  font-weight: 700;
  color: #14532d;
  background: #f0fdf4;
  border-left: 3px solid #22c55e;
  padding: 7px 11px;
}

/* Hint box */
.hint-inner { display: grid; gap: 10px; }
.hint-idea {
  display: flex;
  gap: 10px;
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: 10px;
  padding: 11px 13px;
}
.hint-bulb { font-size: 1.1rem; flex-shrink: 0; }
.hint-label {
  font-size: .68rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .09em;
  color: #92400e;
  margin: 0 0 4px;
}
.hint-text { margin: 0; color: var(--ink-mid); line-height: 1.55; font-size: .9rem; }
.hint-move {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 11px 13px;
}
.hint-move .hint-label { color: var(--muted); }
.hint-exhausted {
  background: var(--bg);
  border-radius: 8px;
  padding: 8px 12px;
  font-size: .82rem;
  color: var(--muted);
  font-weight: 600;
  text-align: center;
}

/* ═══════════════════════════════════════════════════════════════
   DASHBOARD — unlock board & challenge launcher
   ═══════════════════════════════════════════════════════════════ */
.unlock-board { display: grid; gap: 8px; }
.unlock-card {
  display: grid;
  grid-template-columns: 40px 1fr auto;
  gap: 12px;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  padding: 12px 14px;
  text-decoration: none;
  color: var(--ink);
  transition: .15s ease;
}
.unlock-card:hover { border-color: var(--primary); box-shadow: var(--shadow-sm); transform: translateY(-1px); }
.unlock-card.unlock-ready { border-color: #a7f3d0; background: #f0fdf4; }
.unlock-icon {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 800;
  flex-shrink: 0;
  font-family: 'Space Grotesk', sans-serif;
}
.unlock-body strong { display: block; font-weight: 700; font-size: .9rem; color: var(--ink); margin-bottom: 3px; }
.unlock-body span { font-size: .75rem; color: var(--muted); font-weight: 600; display: block; margin-bottom: 6px; }
.unlock-bar { height: 5px; border-radius: 999px; background: var(--bg); border: 1px solid var(--border); overflow: hidden; }
.unlock-fill { height: 100%; border-radius: inherit; transition: width .4s ease; }
.unlock-badge {
  border: 1px solid var(--border);
  background: var(--bg);
  border-radius: 8px;
  padding: 4px 9px;
  font-size: .72rem;
  font-weight: 800;
  color: var(--muted);
  white-space: nowrap;
}
.unlock-badge.ready {
  background: #dcfce7;
  border-color: #a7f3d0;
  color: #14532d;
}

.challenge-board { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.flagged-board { display: flex; flex-direction: column; gap: 8px; margin-top: 4px; }
.flagged-board-empty { color: var(--muted); font-size: .85rem; line-height: 1.6; padding: 12px 0; }
.flagged-board-row { border: 1px solid var(--border); border-radius: 12px; padding: 12px 14px; background: var(--surface); }
.flagged-board-meta { display: flex; justify-content: space-between; align-items: center; margin-bottom: 4px; }
.flagged-board-concept { font-size: .78rem; font-weight: 700; color: var(--primary); text-transform: uppercase; letter-spacing: .04em; }
.flagged-board-date { font-size: .74rem; color: var(--muted); }
.flagged-board-text { font-size: .84rem; color: var(--ink-mid); margin: 0 0 8px; line-height: 1.5; }
.flagged-board-actions { display: flex; gap: 8px; align-items: center; }
.flagged-board-practice { font-size: .76rem !important; padding: 3px 10px !important; color: var(--primary) !important; border-color: var(--primary) !important; }
.flagged-board-remove { font-size: .76rem !important; padding: 3px 10px !important; }
.challenge-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  padding: 14px;
  text-decoration: none;
  color: var(--ink);
  transition: .15s ease;
  position: relative;
  overflow: hidden;
}
.challenge-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--accent, var(--primary));
}
.challenge-card:hover { border-color: var(--accent, var(--primary)); box-shadow: var(--shadow-sm); transform: translateY(-1px); }
.challenge-card-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 2px; }
.challenge-difficulty { font-size: .65rem; font-weight: 800; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); margin-bottom: 4px; display: block; }
.challenge-subject { font-size: .75rem; font-weight: 800; display: block; margin-bottom: 1px; }
.challenge-concept { margin: 4px 0 0; font-size: .95rem; font-weight: 700; color: var(--ink); line-height: 1.3; }
.challenge-arrow { font-size: 1rem; color: var(--muted); margin-top: auto; }

/* ═══════════════════════════════════════════════════════════════
   MOCK EXAM — rebuilt hero + stats bar
   ═══════════════════════════════════════════════════════════════ */
.mock-hero {
  width: min(1200px, calc(100% - 32px));
  margin: 28px auto 0;
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 24px;
  align-items: center;
}
.mock-hero-left h1 { font-size: clamp(1.8rem,4vw,2.8rem); margin-bottom: 10px; }
.mock-hero-left p { color: var(--muted); line-height: 1.65; margin-bottom: 16px; }
.mock-ramp-strip { display: flex; gap: 8px; }
.mock-ramp-seg {
  flex: 1;
  border-radius: 12px;
  padding: 10px 12px;
  font-size: .78rem;
  font-weight: 700;
  border: 1px solid var(--border);
  background: var(--surface);
}
.mock-ramp-seg span { display: block; font-size: .68rem; font-weight: 800; text-transform: uppercase; letter-spacing: .06em; margin-bottom: 3px; color: var(--muted); }
.seg-found { border-color: #c7d7fb; background: #eff3ff; color: var(--primary); }
.seg-int { border-color: #fde68a; background: #fffbeb; color: #92400e; }
.seg-chal { border-color: #e9d5ff; background: #f5f3ff; color: #6d28d9; }
.mock-timer-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 24px;
  text-align: center;
  box-shadow: var(--shadow-sm);
}
.timer.mock-main-timer {
  font-size: clamp(2.8rem,6vw,3.8rem);
  font-weight: 700;
  letter-spacing: -.03em;
  color: var(--ink);
  margin: 0 0 4px;
  text-align: center;
}
.mock-timer-label { font-size: .72rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); margin: 0 0 14px; }
.mock-toolbar { display: flex; justify-content: center; gap: 8px; flex-wrap: wrap; }
.mock-stats-bar {
  display: grid;
  grid-template-columns: repeat(6,1fr);
  gap: 10px;
  margin-top: 20px !important;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px 20px;
  box-shadow: var(--shadow-sm);
}
.mock-stat-item { text-align: center; }
.mock-stat-item strong { display: block; font-size: 1.15rem; font-weight: 700; font-family: 'Space Grotesk', sans-serif; color: var(--ink); margin-bottom: 3px; }
.mock-stat-item span { font-size: .72rem; font-weight: 700; color: var(--muted); text-transform: uppercase; letter-spacing: .05em; }

/* Mock question list improvements */
.mock-question {
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
  padding: 18px 20px;
  transition: .12s ease;
}
.mock-question:hover { box-shadow: var(--shadow-sm); }
.mock-question-head { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; flex-wrap: wrap; }
.mock-question-head strong {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 9px;
  background: var(--bg);
  color: var(--primary);
  font-size: .78rem;
  font-weight: 800;
  border: 1px solid #c7d7fb;
  flex-shrink: 0;
}
.mock-question-head span {
  font-size: .75rem;
  font-weight: 700;
  color: var(--muted);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: 3px 8px;
}
.mock-question p { font-size: 1rem; line-height: 1.7; color: var(--ink); font-weight: 500; margin-bottom: 12px; }
.mock-question input { max-width: 280px; }
.mock-question.answer-correct { border-color: #a7f3d0; background: #f0fdf4; }
.mock-question.answer-incorrect { border-color: #fed7aa; background: #fff7ed; }

/* Mock empty state */
.mock-empty-state {
  border: 1px dashed var(--border);
  border-radius: 16px;
  background: var(--surface);
  padding: 40px 24px;
  text-align: center;
  color: var(--muted);
}
.mock-empty-state h3 { color: var(--ink); margin-bottom: 8px; }

/* Responsive mock */
@media(max-width:900px) {
  .mock-hero { grid-template-columns: 1fr; }
  .mock-timer-card { max-width: 320px; }
  .mock-stats-bar { grid-template-columns: repeat(3,1fr); }
  .challenge-board { grid-template-columns: 1fr; }
}
@media(max-width:600px) {
  .mock-stats-bar { grid-template-columns: repeat(2,1fr); }
  .mock-ramp-strip { flex-direction: column; }
}

/* ── Dashboard grid layout ─────────────────────────────────────── */
.dash-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  grid-template-rows: auto auto;
  gap: 16px;
}
.dash-unlock { }
.dash-challenge { }
.dash-review { }
.dash-review-subjects { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.dash-review-btn { display: flex; align-items: center; gap: 8px; padding: 13px 16px; border-radius: 12px; border: 1.5px solid color-mix(in srgb, var(--rv) 30%, transparent); background: color-mix(in srgb, var(--rv) 8%, white); color: var(--rv); font-size: .88rem; font-weight: 700; text-decoration: none; transition: .13s ease; }
.dash-review-btn:hover { background: color-mix(in srgb, var(--rv) 14%, white); border-color: color-mix(in srgb, var(--rv) 50%, transparent); }

@media(max-width:900px) {
  .dash-grid { grid-template-columns: 1fr; }
  .dash-unlock { grid-row: span 1; }
}

/* Controls single-line divider */
.pcv2-divider {
  width: 1px;
  height: 28px;
  background: var(--border);
  flex-shrink: 0;
}
#topicRow { display: contents; }

/* ═══════════════════════════════════════════════════════════════
   KATEX / MATH DISPLAY
   ═══════════════════════════════════════════════════════════════ */
.katex { font-size: 1.05em; }
.katex-display { margin: 8px 0; overflow-x: auto; }
.katex .katex-html { white-space: nowrap; }
#problemText .katex, .qps-text .katex, .mock-question p .katex { font-size: 1.08em; }
.vc-body-text .katex { font-size: 1em; }
.math-times { font-size: 1.05em; font-weight: 800; color: var(--ink); padding: 0 .05em; }

/* ═══════════════════════════════════════════════════════════════
   GAMIFICATION — XP, STREAKS, LEVELS, ACHIEVEMENTS
   ═══════════════════════════════════════════════════════════════ */

/* Nav XP + streak strip */
.nav-game-strip {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: 8px;
  flex-shrink: 0;
}
.nav-streak-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: linear-gradient(135deg,#fff7ed,#fef3c7);
  border: 1px solid #fde68a;
  border-radius: 999px;
  padding: 4px 10px;
  font-size: .8rem;
  font-weight: 800;
  color: #92400e;
  white-space: nowrap;
  transition: .15s ease;
}
.nav-streak-chip:hover { transform: scale(1.05); }
.nav-xp-wrap {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 5px 12px;
  font-size: .78rem;
  font-weight: 700;
  color: var(--ink-mid);
  white-space: nowrap;
}
.nav-xp-level {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 800;
  color: var(--primary);
  font-size: .82rem;
}
.nav-xp-bar {
  width: 40px;
  height: 6px;
  border-radius: 999px;
  background: var(--bg);
  border: 1px solid var(--border);
  overflow: hidden;
  flex-shrink: 0;
}
.nav-xp-fill {
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--primary), var(--cnt));
  transition: width .4s ease;
}

/* XP flash animation */
.xp-flash {
  position: fixed;
  z-index: 9999;
  pointer-events: none;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.1rem;
  font-weight: 800;
  color: #14532d;
  background: #dcfce7;
  border: 1.5px solid #a7f3d0;
  border-radius: 999px;
  padding: 6px 14px;
  transform: translateX(-50%);
  animation: xpFloat 1.1s ease-out forwards;
}
@keyframes xpFloat {
  0%   { opacity: 1; transform: translateX(-50%) translateY(0); }
  80%  { opacity: .9; transform: translateX(-50%) translateY(-48px); }
  100% { opacity: 0; transform: translateX(-50%) translateY(-64px); }
}

/* Achievement toast */
.achievement-toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9999;
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--surface);
  border: 1.5px solid #c7d7fb;
  border-radius: 16px;
  padding: 14px 18px;
  box-shadow: var(--shadow-lg);
  transform: translateY(120%);
  opacity: 0;
  transition: transform .35s cubic-bezier(.34,1.56,.64,1), opacity .35s ease;
  max-width: 300px;
}
.achievement-toast.visible { transform: translateY(0); opacity: 1; }
.achievement-toast-icon { font-size: 1.8rem; line-height: 1; flex-shrink: 0; }
.achievement-toast strong { display: block; font-size: .7rem; font-weight: 800; text-transform: uppercase; letter-spacing: .1em; color: var(--primary); margin-bottom: 3px; }
.achievement-toast p { margin: 0; font-weight: 700; font-size: .92rem; color: var(--ink); }

/* Level badge */
.level-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border-radius: 10px;
  padding: 8px 14px;
  font-weight: 700;
  font-size: .88rem;
  border: 1px solid var(--border);
  background: var(--surface);
}
.level-badge-num {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.4rem;
  font-weight: 800;
  line-height: 1;
}

/* XP progress bar (full width, e.g. on dashboard) */
.xp-progress-wrap {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px 20px;
}
.xp-progress-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}
.xp-progress-top strong { font-family: 'Space Grotesk', sans-serif; font-size: 1.1rem; font-weight: 700; }
.xp-progress-top span { color: var(--muted); font-size: .82rem; font-weight: 600; }
.xp-full-bar {
  height: 10px;
  border-radius: 999px;
  background: var(--bg);
  border: 1px solid var(--border);
  overflow: hidden;
}
.xp-full-fill {
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--primary), var(--cnt));
  transition: width .5s ease;
}
.xp-progress-sub { margin-top: 7px; color: var(--muted); font-size: .78rem; font-weight: 600; }

/* ═══════════════════════════════════════════════════════════════
   PROBLEM CARD — enter animation + correct/incorrect flash
   ═══════════════════════════════════════════════════════════════ */
@keyframes problemEnter {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}
.problem-card.animating { animation: problemEnter .25s ease; }

@keyframes correctPulse {
  0%,100% { box-shadow: var(--shadow-sm); }
  50%      { box-shadow: 0 0 0 4px rgba(5,150,105,.25), var(--shadow); }
}
.problem-card.flash-correct { animation: correctPulse .5s ease; }

@keyframes incorrectShake {
  0%,100% { transform: translateX(0); }
  20%      { transform: translateX(-6px); }
  60%      { transform: translateX(4px); }
}
.problem-card.flash-incorrect { animation: incorrectShake .35s ease; }

/* Correct/incorrect answer row coloring */
.answer-row input.correct-input  { border-color: #059669; background: #f0fdf4; }
.answer-row input.incorrect-input { border-color: #dc2626; background: #fff7ed; }

/* ═══════════════════════════════════════════════════════════════
   LEARNING QUEST — gamification & polish
   ═══════════════════════════════════════════════════════════════ */

/* Skill star beside completed topics */
.quest-topic-star { color: #d97706; font-size: .9rem; }
.quest-topic.done .quest-topic-star { color: #059669; }

/* Better checkpoint score display */
.ql-check-score-display {
  text-align: center;
  padding: 24px 16px 16px;
}
.ql-check-score-num {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1;
  color: var(--ink);
}
.ql-check-score-num.pass { color: #059669; }
.ql-check-score-num.fail { color: #dc2626; }
.ql-check-score-label { color: var(--muted); font-weight: 600; font-size: .88rem; margin-top: 4px; }

/* XP earned card in quest */
.ql-xp-earned {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg,#f0fdf4,#dcfce7);
  border: 1.5px solid #a7f3d0;
  border-radius: 12px;
  padding: 8px 16px;
  font-weight: 700;
  color: #14532d;
  font-size: .92rem;
  margin-top: 10px;
}
.ql-xp-earned span { font-size: 1.2rem; }

/* Quest topic badge improvements */
.quest-topic-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: .68rem;
  font-weight: 800;
  padding: 3px 8px;
  border-radius: 6px;
  text-transform: uppercase;
  letter-spacing: .06em;
}
.quest-topic-badge.locked   { background: var(--bg);    color: var(--muted);  border: 1px solid var(--border); }
.quest-topic-badge.current  { background: #fffbeb;      color: #92400e;       border: 1px solid #fde68a; }
.quest-topic-badge.done     { background: #dcfce7;      color: #14532d;       border: 1px solid #a7f3d0; }

/* Better section headings in quest */
.ql-section-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 24px 0 16px;
}
.ql-section-divider::before,
.ql-section-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}
.ql-section-divider-text {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: .7rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--muted);
  white-space: nowrap;
}

/* ═══════════════════════════════════════════════════════════════
   DIAGRAM IMPROVEMENTS — larger, more polished containers
   ═══════════════════════════════════════════════════════════════ */
.visual-card svg {
  min-height: unset !important;
}
.problem-svg {
  width: min(100%, 480px);
  min-height: 180px;
}

/* Better diagram label readability */
.visual-card text {
  font-family: 'Inter', system-ui, sans-serif !important;
  font-size: 13px !important;
  stroke: none !important;
}

/* ═══════════════════════════════════════════════════════════════
   DARK HOVER CARD IMPROVEMENTS
   ═══════════════════════════════════════════════════════════════ */
.dashboard-card { transition: box-shadow .15s ease; }
.dashboard-card:hover { box-shadow: var(--shadow); }

/* ═══════════════════════════════════════════════════════════════
   FEEDBACK IMPROVEMENTS — bigger, clearer banners
   ═══════════════════════════════════════════════════════════════ */
.feedback {
  border-radius: 14px;
  padding: 16px 18px;
  margin: 14px 0;
  line-height: 1.65;
  font-size: .95rem;
  font-weight: 600;
}
.feedback.correct {
  background: linear-gradient(135deg,#f0fdf4,#dcfce7);
  color: #14532d;
  border: 1.5px solid #a7f3d0;
}
.feedback.incorrect {
  background: linear-gradient(135deg,#fff7ed,#fef3c7);
  color: #7c2d12;
  border: 1.5px solid #fcd34d;
}

/* ═══════════════════════════════════════════════════════════════
   HERO SECTION POLISH
   ═══════════════════════════════════════════════════════════════ */
.dashboard-hero {
  padding: 40px 0 0;
}
.dashboard-hero h1 {
  background: linear-gradient(135deg, var(--ink) 0%, var(--ink-mid) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ═══════════════════════════════════════════════════════════════
   RESPONSIVE — gamification nav
   ═══════════════════════════════════════════════════════════════ */
@media(max-width:980px) {
  .nav-game-strip { display: none; }
}
@media(max-width:640px) {
  .achievement-toast { left: 16px; right: 16px; bottom: 16px; max-width: none; }
}

/* ═══════════════════════════════════════════════════════════════
   QUEST SIDEBAR — progress bars & visual topic list
   ═══════════════════════════════════════════════════════════════ */

/* Subject tab layout with progress */
.quest-subject-tab {
  display: grid !important;
  grid-template-columns: 40px 1fr !important;
  gap: 0 10px !important;
  align-items: center !important;
  padding: 10px 12px !important;
}
.qst-info { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.qst-info strong { font-size: .88rem; font-weight: 700; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.qst-progress-row { display: flex; align-items: center; gap: 6px; }
.qst-mini-bar {
  flex: 1;
  height: 5px;
  background: var(--border);
  border-radius: 99px;
  overflow: hidden;
}
.qst-mini-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--cnt), #34d399);
  border-radius: 99px;
  transition: width .4s ease;
}
.quest-subject-tab.active .qst-mini-fill { background: linear-gradient(90deg, #60a5fa, #818cf8); }
.qst-progress-row small { font-size: .72rem; font-weight: 700; color: var(--muted); white-space: nowrap; }

/* Topic list items — icon + text layout */
.learning-quest-page .quest-topic {
  display: flex !important;
  align-items: flex-start !important;
  gap: 10px !important;
  padding: 10px 12px !important;
  text-align: left !important;
}
.quest-topic .qtl-icon {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  min-width: 28px;
  border-radius: 50%;
  display: flex !important;
  align-items: center;
  justify-content: center;
  font-size: .75rem;
  font-weight: 800;
  background: var(--bg) !important;
  border: 2px solid var(--border) !important;
  color: var(--muted) !important;
  padding: 0 !important;
  letter-spacing: 0 !important;
  text-transform: none !important;
}
.quest-topic .qtl-icon.done {
  background: #dcfce7 !important;
  border-color: #a7f3d0 !important;
  color: #059669 !important;
  font-size: .95rem;
}
.quest-topic .qtl-icon.current {
  background: var(--primary-lt) !important;
  border-color: var(--primary) !important;
  color: var(--primary) !important;
  font-size: .85rem;
}
.quest-topic .qtl-icon.locked {
  background: var(--bg) !important;
  border-color: var(--border-lt) !important;
  color: var(--muted-lt) !important;
  font-size: .9rem;
}
.qtl-text { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.qtl-text strong { font-size: .88rem; font-weight: 700; line-height: 1.3; }
.qtl-text small { font-size: .76rem; color: var(--muted); line-height: 1.4; }
.quest-topic.done .qtl-text strong { color: var(--green); }
.quest-topic.current .qtl-text strong { color: var(--primary); }

/* ═══════════════════════════════════════════════════════════════
   QUEST LESSON PANEL — polished lesson experience
   ═══════════════════════════════════════════════════════════════ */
.quest-lesson-title-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 20px 14px;
  border-bottom: 1px solid var(--border-lt);
  margin: -18px -18px 18px;
  background: linear-gradient(135deg, #f8faff, #fff);
}
.quest-lesson-title-bar .qltb-icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), #7c3aed);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.quest-lesson-title-bar h2 {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.25;
}
.quest-lesson-title-bar .qltb-meta {
  font-size: .76rem;
  color: var(--muted);
  font-weight: 600;
  margin-top: 2px;
}

/* ═══════════════════════════════════════════════════════════════
   PAGE BACKGROUND — soft aurora gradient (user's preferred look)
   ═══════════════════════════════════════════════════════════════ */
html {
  min-height: 100%;
}
body {
  background-color: #f3f6fc;
  background-image:
    radial-gradient(ellipse 80% 60% at 10% 0%, rgba(167,243,208,.55) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 90% 10%, rgba(254,240,138,.45) 0%, transparent 55%),
    radial-gradient(ellipse 50% 70% at 50% 100%, rgba(199,210,254,.4) 0%, transparent 60%);
  background-attachment: fixed;
}

/* ═══════════════════════════════════════════════════════════════
   DASHBOARD OVERHAUL — rounder, more engaging cards
   ═══════════════════════════════════════════════════════════════ */

/* Unlock / mastery progress cards — override old auto-fill grid */
.unlock-board { display: grid !important; grid-template-columns: 1fr !important; gap: 10px !important; margin-top: 12px; }
.unlock-card {
  display: grid !important;
  grid-template-columns: 52px 1fr auto !important;
  gap: 14px !important;
  align-items: center !important;
  border: 1.5px solid var(--border) !important;
  border-radius: 18px !important;
  background: var(--surface) !important;
  padding: 14px 16px !important;
  text-decoration: none !important;
  color: var(--ink) !important;
  transition: all .18s ease !important;
  box-shadow: 0 1px 4px rgba(13,24,41,.05) !important;
}
.unlock-card:hover {
  border-color: var(--primary) !important;
  box-shadow: 0 4px 18px rgba(37,99,235,.13) !important;
  transform: translateY(-2px) !important;
}
.unlock-card.unlock-ready {
  border-color: #86efac !important;
  background: linear-gradient(135deg, #f0fdf4, #fff) !important;
}
.unlock-card.unlock-ready:hover { border-color: #059669 !important; }
.unlock-icon {
  width: 52px !important;
  height: 52px !important;
  border-radius: 16px !important;
  display: grid !important;
  place-items: center !important;
  font-size: 1.2rem !important;
  font-weight: 800 !important;
  font-family: 'Space Grotesk', sans-serif !important;
}
.unlock-body strong { display: block; font-weight: 700; font-size: .93rem; color: var(--ink); margin-bottom: 3px; }
.unlock-body span { font-size: .76rem; color: var(--muted); font-weight: 600; display: block; margin-bottom: 7px; }
.unlock-bar {
  height: 7px;
  border-radius: 999px;
  background: var(--bg);
  border: 1px solid var(--border-lt);
  overflow: hidden;
}
.unlock-fill { height: 100%; border-radius: inherit; transition: width .5s ease; }
.unlock-badge {
  border: 1.5px solid var(--border);
  background: var(--bg);
  border-radius: 10px;
  padding: 5px 10px;
  font-size: .72rem;
  font-weight: 800;
  color: var(--muted);
  white-space: nowrap;
  flex-shrink: 0;
}
.unlock-badge.ready {
  background: linear-gradient(135deg, #dcfce7, #bbf7d0);
  border-color: #86efac;
  color: #14532d;
}

/* Challenge launcher cards — override old auto-fill grid */
.challenge-board { display: grid !important; grid-template-columns: 1fr 1fr !important; gap: 10px !important; margin-top: 12px; }
.challenge-card {
  display: flex !important;
  flex-direction: column !important;
  gap: 7px !important;
  border: 1.5px solid var(--border) !important;
  border-radius: 18px !important;
  background: var(--surface) !important;
  padding: 16px !important;
  text-decoration: none !important;
  color: var(--ink) !important;
  transition: all .18s ease !important;
  position: relative !important;
  overflow: hidden !important;
  box-shadow: 0 1px 4px rgba(13,24,41,.05) !important;
}
.challenge-card::before {
  content: '' !important;
  position: absolute !important;
  top: 0; left: 0; right: 0 !important;
  height: 4px !important;
  background: var(--accent, var(--primary)) !important;
  border-radius: 18px 18px 0 0 !important;
}
.challenge-card:hover {
  border-color: var(--accent, var(--primary)) !important;
  box-shadow: 0 6px 20px rgba(37,99,235,.13) !important;
  transform: translateY(-2px) !important;
}
.challenge-concept { margin: 0 !important; font-size: .9rem !important; font-weight: 700 !important; color: var(--ink) !important; line-height: 1.3 !important; }
.challenge-arrow { font-size: 1.1rem !important; color: var(--muted) !important; margin-top: auto !important; }

/* Dashboard grid — 3-column at desktop */
.dash-grid {
  display: grid !important;
  grid-template-columns: 1fr 1fr 1fr !important;
  grid-template-rows: auto !important;
  gap: 20px !important;
  align-items: stretch !important;
}
@media(max-width:800px) { .dash-grid { grid-template-columns: 1fr 1fr !important; } }
@media(max-width:520px)  { .dash-grid { grid-template-columns: 1fr !important; } }

/* Dashboard card — consistently rounded */
.dashboard-card {
  border-radius: 20px !important;
  padding: 20px !important;
}

/* Visual number pills (diagram info chips) */
.visual-number-row span {
  border-radius: 10px;
  padding: 5px 11px;
  font-size: .8rem;
  font-weight: 700;
  background: var(--primary-lt);
  color: var(--primary);
  border: 1px solid #c7d7fb;
}

/* vc-body — the text section below each diagram */
.vc-body {
  padding: 13px 16px 14px;
  background: var(--surface);
}
.vc-body-text {
  font-size: .84rem;
  color: var(--ink-mid);
  margin-bottom: 8px;
  line-height: 1.6;
}

/* ═══════════════════════════════════════════════════════════════
   STATS CARD — bigger bolder numbers
   ═══════════════════════════════════════════════════════════════ */
.mini-stats { display: grid; grid-template-columns: repeat(3,1fr); gap: 8px; margin-top: 18px; }
.mini-stats div { border-radius: 14px; padding: 14px 8px; text-align: center; background: var(--bg); border: 1px solid var(--border); }
.mini-stats strong { font-size: 1.7rem; font-weight: 900; letter-spacing: -.03em; color: var(--primary); display: block; line-height: 1; margin-bottom: 5px; }
.mini-stats span { font-size: .68rem; font-weight: 700; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); white-space: nowrap; }
.mini-stats div:nth-child(2) strong { color: var(--cnt); }
.mini-stats div:nth-child(3) strong { color: var(--geo); }

/* ═══════════════════════════════════════════════════════════════
   XP LEVEL CARD — prominent level badge + bar
   ═══════════════════════════════════════════════════════════════ */
.xp-progress-wrap {
  display: flex !important;
  align-items: center;
  gap: 16px;
  background: linear-gradient(135deg, #eff3ff 0%, #f5f3ff 50%, #ecfdf5 100%) !important;
  border: 1.5px solid var(--border) !important;
  border-radius: 20px !important;
  padding: 18px 22px !important;
  box-shadow: var(--shadow-sm) !important;
  margin-bottom: 4px;
}
.xp-level-badge {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--primary), var(--geo));
  color: #fff;
  font-weight: 900;
  font-size: 1.05rem;
  display: grid;
  place-items: center;
  box-shadow: 0 4px 14px rgba(37,99,235,.3);
  letter-spacing: -.02em;
}
.xp-progress-body { flex: 1; min-width: 0; }
.xp-progress-top { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 8px; }
.xp-progress-top strong { font-size: 1rem; font-weight: 800; color: var(--ink); }
.xp-progress-top span { font-size: .75rem; font-weight: 700; color: var(--muted); }
.xp-full-bar { height: 12px !important; border-radius: 999px; background: rgba(255,255,255,.7) !important; border: 1px solid var(--border) !important; overflow: hidden; }
.xp-full-fill { height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--primary), var(--geo)) !important; transition: width .5s ease; box-shadow: 0 2px 8px rgba(37,99,235,.4); }
.xp-progress-sub { margin-top: 6px !important; font-size: .76rem !important; font-weight: 700 !important; color: var(--muted) !important; }

/* ═══════════════════════════════════════════════════════════════
   CATEGORY CARDS — bigger icons, more visual punch
   ═══════════════════════════════════════════════════════════════ */
.category-card { border-radius: 20px !important; padding: 24px !important; position: relative; overflow: hidden; }
.category-card h3 { font-size: 1.2rem !important; font-weight: 800 !important; margin-bottom: 10px; }
/* icons removed */
.category-card p { font-size: .9rem !important; line-height: 1.65 !important; color: var(--ink-mid); }

/* ═══════════════════════════════════════════════════════════════
   CHALLENGE CARDS — more visual energy
   ═══════════════════════════════════════════════════════════════ */
.challenge-card {
  border-radius: 18px !important;
  padding: 18px !important;
  background: var(--surface) !important;
  border: 1.5px solid var(--border) !important;
  box-shadow: var(--shadow-sm) !important;
  transition: all .18s ease !important;
}
.challenge-card:hover {
  transform: translateY(-3px) !important;
  box-shadow: 0 8px 24px rgba(0,0,0,.1) !important;
  border-color: var(--accent, var(--primary)) !important;
}
.challenge-concept { font-size: 1.1rem !important; font-weight: 800 !important; color: var(--ink) !important; margin: 10px 0 !important; }

/* ═══════════════════════════════════════════════════════════════
   REVIEWS SECTION — make it warmer
   ═══════════════════════════════════════════════════════════════ */
.review-grid article {
  border-radius: 18px !important;
  padding: 22px !important;
  background: var(--surface) !important;
  border: 1.5px solid var(--border) !important;
  box-shadow: var(--shadow-sm) !important;
}
.review-grid article strong {
  display: block;
  font-size: .95rem !important;
  font-weight: 800 !important;
  color: var(--ink) !important;
  margin-top: 14px !important;
}
.review-grid article p {
  color: var(--ink-mid) !important;
  line-height: 1.65 !important;
  font-size: .9rem !important;
}

/* ═══════════════════════════════════════════════════════════════
   DIAGRAM SVG — richer background gradients by subject
   ═══════════════════════════════════════════════════════════════ */
.visual-card { border-radius: 18px !important; border: 1.5px solid var(--border) !important; max-width: 400px !important; margin-left: auto !important; margin-right: auto !important; }
.visual-card svg { border-radius: 0 !important; }
.algebra-visual svg   { background: linear-gradient(160deg, #eff3ff 0%, #dbeafe 100%) !important; }
.geometry-visual svg  { background: linear-gradient(160deg, #f5f3ff 0%, #ede9fe 100%) !important; }
.counting-visual svg  { background: linear-gradient(160deg, #ecfdf5 0%, #d1fae5 100%) !important; }
.number-visual svg    { background: linear-gradient(160deg, #ecfeff 0%, #cffafe 100%) !important; }

/* ═══════════════════════════════════════════════════════════════
   HERO ACCOUNT CARD — cleaner separation
   ═══════════════════════════════════════════════════════════════ */
.account-card {
  border-radius: 24px !important;
  border: 1.5px solid var(--border) !important;
  box-shadow: var(--shadow) !important;
}
.account-card h2 { font-size: 1.1rem !important; font-weight: 800 !important; margin: 12px 0 4px !important; }
.card-topline { font-size: .78rem; font-weight: 700; color: var(--muted); display: flex; justify-content: space-between; align-items: center; }

/* ═══════════════════════════════════════════════════════════════
   LEARNERS CORNER — hub page
   ═══════════════════════════════════════════════════════════════ */
.learners-corner-page {
  background-color: #f0fdf4;
  background-image:
    radial-gradient(ellipse 80% 55% at 5% 0%,  rgba(167,243,208,.65) 0%, transparent 60%),
    radial-gradient(ellipse 55% 50% at 95% 5%,  rgba(254,240,138,.5)  0%, transparent 55%),
    radial-gradient(ellipse 45% 65% at 50% 105%, rgba(199,210,254,.45) 0%, transparent 60%);
  background-attachment: fixed;
  min-height: 100vh;
}

/* Header */
.lc-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  height: 58px;
  background: rgba(255,255,255,.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(221,228,240,.7);
  box-shadow: 0 1px 8px rgba(13,24,41,.05);
}
.lc-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1rem;
}
.lc-brand span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: linear-gradient(135deg, #059669, #2563eb);
  color: #fff;
  font-size: .85rem;
  font-weight: 800;
  font-family: 'Space Grotesk', sans-serif;
  letter-spacing: -.02em;
}

/* Hero */
.lc-hero {
  text-align: center;
  padding: 80px 24px 52px;
  max-width: 640px;
  margin: 0 auto;
}
.lc-hero h1 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  font-weight: 800;
  letter-spacing: -.03em;
  color: var(--ink);
  margin: 10px 0 14px;
  background: linear-gradient(135deg, #059669 0%, #2563eb 55%, #7c3aed 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.lc-hero p {
  color: var(--ink-mid);
  font-size: 1.08rem;
  max-width: 480px;
  margin: 0 auto;
}

/* App grid */
.lc-app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(520px, 1fr));
  gap: 32px;
  max-width: 1300px;
  margin: 0 auto;
  padding: 0 48px 100px;
}

/* App card base */
.lc-app-card {
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: 40px;
  background: rgba(255,255,255,.88);
  border: 1.5px solid var(--border);
  border-radius: 22px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: transform .18s ease, box-shadow .18s ease;
  text-decoration: none;
  color: var(--ink);
}
.lc-app-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

/* App icon */
.lc-app-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 800;
  font-size: 1.4rem;
  color: #fff;
  flex-shrink: 0;
  background: linear-gradient(135deg, #2563eb, #7c3aed);
}

/* Mathyessy card */
.mathyessy-card { border-color: rgba(37,99,235,.25); }
.mathyessy-card .lc-app-icon { background: linear-gradient(135deg, #2563eb, #7c3aed); }

/* Placeholder card */
.placeholder-card { border-style: dashed; border-color: var(--border); opacity: .72; }
.placeholder-card .lc-app-icon { background: linear-gradient(135deg, #8fa0b8, #b0bfd6); }

/* Status badge */
.lc-app-status {
  display: inline-block;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: #059669;
  background: rgba(5,150,105,.1);
  border-radius: 999px;
  padding: 3px 10px;
  margin-bottom: 6px;
}
.placeholder-card .lc-app-status { color: var(--muted); background: rgba(91,111,142,.1); }

/* Card content */
.lc-app-card h2 {
  margin: 0 0 6px;
  font-size: 1.2rem;
  font-weight: 800;
  font-family: 'Space Grotesk', sans-serif;
}
.lc-app-card p { color: var(--ink-mid); font-size: .88rem; margin: 0; line-height: 1.55; }
.lc-app-card > strong {
  font-size: .84rem;
  font-weight: 700;
  color: #2563eb;
  margin-top: auto;
}
.placeholder-card > strong { color: var(--muted); }

/* Feature row pills */
.lc-feature-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}
.lc-feature-row span {
  font-size: .72rem;
  font-weight: 700;
  color: #7c3aed;
  background: rgba(124,58,237,.09);
  border-radius: 999px;
  padding: 3px 10px;
}

/* Featured card — wider accent */
.featured-app-card {
  border-left: 4px solid #2563eb;
  background: linear-gradient(145deg, rgba(239,243,255,.9), rgba(255,255,255,.92));
}


/* ═══════════════════════════════════════════════════════════════
   10/10 POLISH — next problem button, admin table, handles
   ═══════════════════════════════════════════════════════════════ */

/* Admin table always scrollable */
.admin-table-wrap { overflow-x: auto; }
.admin-table { min-width: 780px; }
.admin-table td, .admin-table th { white-space: nowrap; }
.admin-wipe-confirm { font-size: .82rem; color: var(--ink); margin-right: 8px; white-space: normal; }
.admin-role-status { font-size: .78rem; font-weight: 700; margin-left: 6px; }
.admin-role-status.saving { color: var(--muted); }
.admin-role-status.saved  { color: #059669; }
.admin-role-status.error  { color: #dc2626; }

/* ─── Problem Lab ─────────────────────────────────────────────────────────── */
.plab-shell { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; align-items: start; }
@media(max-width: 860px) { .plab-shell { grid-template-columns: 1fr; } }
.plab-card { background: var(--surface); border: 1.5px solid var(--border); border-radius: 20px; padding: 28px; }
.plab-card-head { margin-bottom: 20px; }
.plab-card-head h2 { font-size: 1.2rem; margin: 0 0 6px; }
.plab-card-head p { color: var(--muted); font-size: .88rem; margin: 0; }
.plab-textarea { width: 100%; min-height: 130px; resize: vertical; padding: 14px; border: 1.5px solid var(--border); border-radius: 12px; font-family: inherit; font-size: .93rem; background: var(--bg); color: var(--ink); box-sizing: border-box; transition: border-color .15s; }
.plab-textarea:focus { outline: none; border-color: var(--primary); }
.plab-or-row { display: flex; align-items: center; gap: 10px; margin: 16px 0; }
.plab-or-line { flex: 1; height: 1px; background: var(--border); }
.plab-or-label { font-size: .78rem; color: var(--muted); white-space: nowrap; font-weight: 600; }
.plab-upload-zone { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px; padding: 20px; border: 2px dashed var(--border); border-radius: 14px; cursor: pointer; color: var(--muted); font-size: .85rem; text-align: center; transition: border-color .15s, background .15s; }
.plab-upload-zone:hover, .plab-upload-zone.drag-over { border-color: var(--primary); background: var(--primary-lt); color: var(--primary); }
.plab-analyze-btn { width: 100%; margin-top: 20px; }
.plab-image-preview { margin-top: 12px; position: relative; }
.plab-uploaded-img { max-width: 100%; border-radius: 10px; border: 1.5px solid var(--border); display: block; }
.plab-img-clear { position: absolute; top: 8px; right: 8px; background: rgba(0,0,0,.55); color: #fff; border: none; border-radius: 8px; padding: 4px 10px; font-size: .78rem; cursor: pointer; }
.plab-output-col { min-height: 300px; }
.plab-empty-state { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 14px; padding: 60px 24px; color: var(--muted); text-align: center; border: 1.5px dashed var(--border); border-radius: 20px; }
.plab-empty-state p { font-size: .9rem; max-width: 260px; }
.plab-analyzing { display: flex; align-items: center; gap: 12px; padding: 40px; color: var(--muted); font-size: .9rem; }
.plab-spinner { width: 18px; height: 18px; border: 2.5px solid var(--border); border-top-color: var(--primary); border-radius: 50%; animation: spin .7s linear infinite; flex-shrink: 0; }
@keyframes spin { to { transform: rotate(360deg); } }
.plab-result { animation: fadeUp .3s ease; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }
.plab-result-head { display: flex; align-items: center; gap: 10px; padding: 12px 16px; border-radius: 12px; margin-bottom: 20px; font-size: .92rem; }
.plab-result-match { background: var(--primary-lt); color: var(--primary); }
.plab-result-unknown { background: #fff7da; color: #92400e; }
body.dark .plab-result-unknown { background: #2d2000; color: #fbbf24; }
.plab-subject-pill { margin-left: auto; background: var(--primary); color: #fff; border-radius: 999px; padding: 2px 10px; font-size: .75rem; font-weight: 700; }
.plab-section-label { font-size: .72rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin: 18px 0 6px; }
.plab-big-idea { font-size: .95rem; color: var(--ink); margin: 0 0 4px; line-height: 1.6; }
.plab-field-label { font-size: .72rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); display: block; margin-bottom: 4px; }
.plab-problem-text { background: var(--bg); border: 1.5px solid var(--border); border-radius: 10px; padding: 12px 16px; margin-bottom: 4px; }
.plab-problem-text p { margin: 0; font-size: .9rem; line-height: 1.6; }
.plab-example { background: var(--primary-lt); border-left: 3px solid var(--primary); border-radius: 0 10px 10px 0; padding: 12px 14px; margin: 10px 0; }
.plab-ex-label { font-size: .72rem; font-weight: 700; color: var(--primary); display: block; margin-bottom: 4px; }
.plab-trap { background: #fff7da; border-left: 3px solid #f5b942; border-radius: 0 10px 10px 0; padding: 12px 14px; margin: 10px 0; }
.plab-trap-label { font-size: .72rem; font-weight: 700; color: #92400e; display: block; margin-bottom: 4px; }
body.dark .plab-trap { background: #2d2000; }
.plab-hints { margin: 0 0 4px; padding-left: 20px; font-size: .88rem; line-height: 1.8; color: var(--ink); }
.plab-diagram-wrap { margin: 4px 0 18px; }
.plab-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 20px; padding-top: 16px; border-top: 1px solid var(--border); }
.plab-notice { padding: 14px 18px; border-radius: 12px; font-size: .9rem; }
.plab-warn { background: #fff7da; color: #92400e; }
body.dark .plab-warn { background: #2d2000; color: #fbbf24; }

/* Next problem button placement */
.answer-row #nextProblem { margin-left: 2px; }

/* Scratchpad vertical handle — more visible */
.scratch-handle {
  height: 12px;
  cursor: ns-resize;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.scratch-handle::before {
  content: '';
  width: 40px;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  transition: background .15s;
}
.scratch-handle:hover::before, .scratch-handle.dragging::before { background: var(--primary); }

/* Scratchpad textarea */
.typed-scratchpad {
  flex: 1;
  min-height: 40px;
  border: none;
  border-top: 1px solid var(--border-lt);
  resize: none;
  font-family: 'Inter', sans-serif;
  font-size: .9rem;
  line-height: 1.6;
  color: var(--ink);
  background: var(--surface);
  padding: 12px 14px;
  outline: none;
}
.typed-scratchpad::placeholder { color: var(--muted); }

/* Width resize handle — more visible dot pattern */
.scratch-width-handle::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 4px;
  height: 48px;
  background: var(--border);
  border-radius: 2px;
  transition: background .15s, height .15s;
}
.scratch-width-handle:hover::after, .scratch-width-handle.dragging::after {
  background: var(--primary);
  height: 64px;
}

/* Dashboard hero — account card responsive fix */
@media (max-width: 960px) {
  .dashboard-hero { grid-template-columns: 1fr; }
  .account-card { max-width: 480px; }
}

/* Feedback banner — remove the "press Next problem" instruction text styling */
.feedback.correct strong, .feedback.incorrect strong { color: inherit; }

/* ── MOBILE PRACTICE LAYOUT ─────────────────────────────────────── */
/* Scratchpad toggle button — only shows on small screens */
.scratchpad-toggle {
  display: none;
  width: 100%;
  margin-top: 12px;
  padding: 9px 16px;
  font-size: .82rem;
  font-weight: 700;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  color: var(--muted);
  cursor: pointer;
  text-align: center;
  transition: border-color .15s, color .15s;
}
.scratchpad-toggle:hover { border-color: var(--primary); color: var(--primary); }

/* Flag button */
.flag-btn {
  font-size: .78rem;
  padding: 5px 12px;
  color: var(--muted);
  font-weight: 600;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  cursor: pointer;
  transition: border-color .15s, color .15s;
  margin-left: auto;
}
.flag-btn:hover { border-color: #f59e0b; color: #f59e0b; }
.flag-btn.flagged { border-color: #f59e0b; color: #f59e0b; background: #fffbeb; }
.flag-locked { display: none; }
.flag-footer { text-align: right; padding: 6px 2px 0; border-top: 1px solid var(--border); margin-top: 12px; }
.flag-link { background: none; border: none; font-size: .74rem; color: var(--muted); cursor: pointer; padding: 2px 0; opacity: .5; transition: opacity .15s, color .15s; font-family: inherit; }
.flag-link:hover { opacity: 1; color: #d97706; }
.flag-link.flagged { color: #f59e0b; opacity: 1; }

/* ── Flagged problems modal ── */
.flagged-modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,.45); z-index: 9999;
  display: flex; align-items: center; justify-content: center; padding: 16px;
}
.flagged-modal {
  background: var(--surface); border-radius: 16px; width: 100%; max-width: 620px;
  max-height: 80vh; display: flex; flex-direction: column;
  box-shadow: 0 20px 60px rgba(0,0,0,.25); overflow: hidden;
}
.flagged-modal-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 24px 14px; border-bottom: 1px solid var(--border);
}
.flagged-modal-header h2 { font-size: 1.15rem; font-weight: 700; margin: 0; }
.flagged-modal-sub { font-size: .83rem; color: var(--muted); padding: 10px 24px 0; margin: 0; }
.flagged-list { overflow-y: auto; padding: 14px 24px 24px; display: flex; flex-direction: column; gap: 14px; }
.flagged-empty { color: var(--muted); font-size: .9rem; text-align: center; padding: 32px 0; }
.flagged-row {
  border: 1.5px solid var(--border); border-radius: 10px; padding: 14px 16px;
  background: var(--bg); display: flex; flex-direction: column; gap: 6px;
}
.flagged-meta { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.flagged-concept { font-size: .75rem; font-weight: 700; background: #eff6ff; color: #1d4ed8; border-radius: 6px; padding: 2px 8px; }
.flagged-topic { font-size: .75rem; color: var(--muted); }
.flagged-date { font-size: .72rem; color: var(--muted); margin-left: auto; }
.flagged-text { font-size: .9rem; line-height: 1.5; margin: 0; }
.flagged-answer { font-size: .82rem; color: var(--muted); margin: 0; }
.flagged-remove { font-size: .72rem; color: #dc2626; border-color: #fecaca; align-self: flex-start; padding: 3px 10px; }

/* Spaced-repetition badge */
.spaced-rep-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: .72rem;
  font-weight: 700;
  background: #fef9c3;
  color: #92400e;
  border: 1px solid #fde68a;
  border-radius: 8px;
  padding: 3px 10px;
  margin-bottom: 10px;
}

@media (max-width: 760px) {
  /* Hide scratchpad by default on mobile */
  .scratchpad-card { display: none; }
  .scratchpad-card.mobile-open { display: block; }
  .scratchpad-toggle { display: block; }

  /* Hide the "Guest progress resets." note on small screens — too cramped */
  .guest-note { display: none; }

  /* Practice hub: subject overview collapses to single column */
  .quadrant-browser { grid-template-columns: 1fr !important; }
  .topic-link-list { grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)); }
  .wide-choice { grid-column: span 1; }

  /* All-practice strip: stack on mobile */
  .all-practice-strip { flex-direction: column; align-items: flex-start; }

  /* Learning Quest: prevent sidebar overflow and collapse grids */
  .quest-sidebar { min-width: 0; overflow: hidden; }
  .quest-shell > * { min-width: 0; }
  .quest-skill-board { grid-template-columns: repeat(2, minmax(0,1fr)) !important; }
  .quest-method-steps { grid-template-columns: 1fr !important; }
  .quest-topic span { width: auto; white-space: normal; max-width: 100%; }
  .ql-concept-grid, .ql-reference-grid { grid-template-columns: 1fr; }
  .quest-hero { grid-template-columns: 1fr; }
  .quest-hero-card { margin-top: 0; }
  .quest-mistake-list, .quest-application-list, .quest-formula-card ul { grid-template-columns: 1fr; }
  .quest-lesson-card { min-width: 0; overflow: hidden; }

  /* Tighten practice controls on mobile */
  .practice-controls-v2 { padding: 10px 14px; }
  .pcv2-chips { flex-wrap: wrap; gap: 5px; }
  .pcv2-chip { padding: 5px 9px; font-size: .73rem; }
  .pcv2-divider { display: none; }
  .pcv2-group { flex-wrap: wrap; }

  /* Answer row: input full width, buttons row */
  .answer-row { flex-direction: column; gap: 8px; }
  .answer-row input[type="text"] { width: 100%; box-sizing: border-box; }
  .answer-row .button { width: 100%; justify-content: center; }

  /* Hint actions row: wraps cleanly */
  .hint-actions { gap: 7px; }
  .hint-actions .ghost { flex: 1 1 auto; text-align: center; }
  .flag-btn { margin-left: 0; width: 100%; text-align: center; }

  /* History card mobile */
  .history-top { flex-direction: column; gap: 10px; }
  .review-attempt-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .problem-card { padding: 16px 14px 16px 16px; }
  #problemText { font-size: 1.05rem; }
  .answer-format-note { font-size: .72rem; }
  /* "with Google" suffix hidden on very small screens */
  .auth-google-suffix { display: none; }
}

/* ── First-step dashboard card ──────────────────────────────────── */
.first-step-card {
  background: linear-gradient(135deg, #eff6ff 0%, #f5f0ff 100%);
  border: 1.5px solid #c7d7fc;
  border-radius: 20px;
  padding: 24px 28px;
  max-width: 740px;
  margin: 0 auto;
}
.first-step-inner {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}
.first-step-icon { font-size: 2.4rem; flex-shrink: 0; line-height: 1; padding-top: 2px; }
.first-step-body h3 { margin: 0 0 6px; font-size: 1.15rem; }
.first-step-body p { color: var(--muted); margin: 0 0 16px; font-size: .9rem; line-height: 1.55; }
.first-step-actions { display: flex; gap: 10px; flex-wrap: wrap; }
@media (max-width: 500px) {
  .first-step-inner { flex-direction: column; gap: 12px; }
  .first-step-card { padding: 18px 16px; }
  .first-step-actions .button { flex: 1 1 100%; text-align: center; justify-content: center; }
}

/* ── Visual polish upgrades ─────────────────────────────────────── */
/* Layered card shadows — more depth */
.dashboard-card, .mission-card, .problem-card, .history-card, .info-card {
  box-shadow:
    0 1px 2px rgba(13,24,41,.04),
    0 4px 12px rgba(13,24,41,.07),
    0 0 0 1px rgba(221,228,240,.6);
  border: none;
}
/* Problem card: subtle left accent for visual anchoring */
.problem-card {
  border-left: 3px solid var(--primary);
  padding-left: 21px;
}
/* Crisper primary button */
.button.primary {
  box-shadow: 0 2px 8px rgba(37,99,235,.25), 0 1px 2px rgba(37,99,235,.18);
  letter-spacing: .01em;
}
.button.primary:active { transform: translateY(0); box-shadow: 0 1px 3px rgba(37,99,235,.2); }
/* Section breathing room — tighter on mobile */
@media (max-width: 760px) {
  .section { padding: 24px 0; }
  .dash-grid { gap: 14px; }
  .dashboard-hero { gap: 18px; }
}

/* Problem Lab — solve block */
.plab-solve-block {
  background: var(--primary-lt, #eff4ff);
  border: 1.5px solid var(--primary);
  border-radius: 12px;
  padding: 16px 18px;
  margin-bottom: 20px;
}
.plab-solve-approach {
  font-weight: 700;
  font-size: .92rem;
  color: var(--primary);
  margin-bottom: 10px;
}
.plab-solve-steps {
  margin: 0 0 12px 0;
  padding-left: 20px;
  color: var(--ink);
  font-size: .88rem;
  line-height: 1.7;
}
.plab-solve-steps li { margin-bottom: 6px; }
.plab-solve-answer {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  background: var(--bg);
  border-radius: 8px;
  margin-bottom: 10px;
}
.plab-answer-label {
  font-size: .75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--muted);
}
.plab-answer-val {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--ink);
  font-family: monospace;
}
.plab-solve-tip {
  font-size: .82rem;
  color: var(--muted);
  font-style: italic;
  border-top: 1px solid var(--border-lt);
  padding-top: 8px;
  margin-top: 6px;
}

/* Compact diagrams everywhere */
.visual-card {
  max-width: 400px !important;
  margin-left: auto !important;
  margin-right: auto !important;
}
.solution-visual { margin: 12px auto !important; }
.quest-lesson-card .visual-card,
.plab-diagram-wrap .visual-card {
  max-width: 360px !important;
}

/* ── Claude AI integration ──────────────────────────────────── */
.claude-key-banner { display:flex; align-items:center; gap:10px; padding:12px 16px; background:linear-gradient(135deg,#f0f4ff,#e8f0fe); border:1.5px solid #c7d7fb; border-radius:12px; margin-bottom:20px; font-size:.87rem; }
.claude-key-banner input { flex:1; padding:7px 10px; border:1.5px solid var(--border); border-radius:8px; font-size:.85rem; background:var(--bg); color:var(--ink); }
.claude-key-banner button { padding:7px 14px; border-radius:8px; background:var(--primary); color:#fff; border:none; cursor:pointer; font-size:.83rem; font-weight:600; white-space:nowrap; }
body.dark .claude-key-banner { background:rgba(82,148,245,.08); border-color:rgba(82,148,245,.3); }
.claude-solution { margin-top:20px; }
.claude-solution-head { display:flex; align-items:center; gap:8px; font-size:.78rem; font-weight:700; letter-spacing:.04em; text-transform:uppercase; color:var(--primary); margin-bottom:12px; }
.claude-solution-body { background:var(--surface); border:1.5px solid var(--border); border-radius:14px; padding:18px 20px; }
.claude-solution-body .claude-approach { font-weight:700; font-size:.95rem; margin-bottom:12px; color:var(--ink); }
.claude-solution-body ol { margin:0 0 14px 0; padding-left:20px; font-size:.9rem; line-height:1.75; }
.claude-solution-body .claude-answer { display:inline-flex; align-items:center; gap:10px; background:var(--primary); color:#fff; padding:8px 16px; border-radius:10px; font-weight:800; font-size:1rem; margin-top:4px; }
.claude-solution-body .claude-tip { margin-top:12px; font-size:.82rem; color:var(--muted); font-style:italic; border-top:1px solid var(--border); padding-top:10px; }
.claude-loading { display:flex; align-items:center; gap:10px; color:var(--muted); font-size:.88rem; padding:16px 0; }
.claude-error { color:#dc2626; font-size:.85rem; padding:12px 0; }
.claude-nav-key { display:flex; align-items:center; gap:6px; padding:5px 10px; border-radius:8px; border:1.5px solid var(--border); background:var(--surface); cursor:pointer; font-size:.78rem; color:var(--muted); transition:.15s; }
.claude-nav-key:hover { border-color:var(--primary); color:var(--primary); }
.claude-nav-key.active { border-color:#16a34a; color:#16a34a; }
.plab-claude-out { margin-top:0; }
.plab-claude-section { margin-bottom:18px; }
.plab-claude-label { font-size:.72rem; font-weight:700; letter-spacing:.06em; text-transform:uppercase; color:var(--muted); margin-bottom:6px; }
.plab-claude-topic { display:inline-flex; align-items:center; gap:6px; background:var(--primary); color:#fff; padding:4px 12px; border-radius:20px; font-size:.82rem; font-weight:600; margin-bottom:14px; }
.plab-claude-approach { font-weight:700; font-size:1rem; margin-bottom:12px; color:var(--ink); }
.plab-claude-steps { padding-left:20px; margin:0 0 14px 0; font-size:.9rem; line-height:1.8; }
.plab-claude-answer { background:var(--primary); color:#fff; display:inline-flex; align-items:center; gap:10px; padding:10px 18px; border-radius:12px; font-size:1.05rem; font-weight:800; margin-bottom:12px; }
.plab-claude-tip { font-size:.83rem; color:var(--muted); font-style:italic; border-top:1px solid var(--border-lt,var(--border)); padding-top:12px; margin-top:4px; }
.plab-no-key { text-align:center; padding:32px 20px; }
.plab-no-key p { color:var(--muted); margin-bottom:16px; font-size:.9rem; }