/* BTEC Sport Unit 1 — Tool styles */
:root {
  --bg: #FBFAF6;
  --surface: #FFFFFF;
  --surface-soft: #F3F7FA;
  --ink: #14201E;
  --ink-2: #455452;
  --muted: #8A9694;
  --line: #E2E5DF;
  --line-2: #D6DBD3;
  --accent: #7C3AED;          /* Sport Unit 1 vivid purple */
  --accent-2: #E9D5FF;
  --accent-ink: #4C1D95;
  --warn: #B45309;
  --warn-bg: #FEF3C7;
  --shadow-sm: 0 1px 2px rgba(20,32,30,.04), 0 4px 8px rgba(20,32,30,.04);
  --shadow-md: 0 6px 24px rgba(20,32,30,.08);
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 16px;
  --font: 'Satoshi', system-ui, -apple-system, 'Segoe UI', Helvetica, sans-serif;
  --mono: 'JetBrains Mono', 'SF Mono', Menlo, monospace;
}

[data-theme="dark"] {
  --bg: #111614;
  --surface: #18201d;
  --surface-soft: #20302a;
  --ink: #edf4f0;
  --ink-2: #b2c1bb;
  --muted: #8a9b94;
  --line: #2a3732;
  --line-2: #33423c;
  --accent-2: #3B1D68;
  --accent-ink: #DDD6FE;
  --warn-bg: #3a2b10;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.24), 0 4px 10px rgba(0,0,0,.22);
  --shadow-md: 0 10px 28px rgba(0,0,0,.35);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); }
button { font-family: inherit; }
select, option { color: var(--ink); background: var(--surface); }

/* ---- Header ---- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(251,250,246,.92);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--line);
  padding: 8px 16px;
  display: flex; align-items: center; justify-content: flex-start; gap: 12px; flex-wrap: wrap;
}
[data-theme="dark"] .topbar { background: rgba(17,22,20,.92); }
.site-unit-nav{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.site-unit-link{
  text-decoration:none;
  font-size:11px;
  font-weight:800;
  letter-spacing:.05em;
  text-transform:uppercase;
  border:1px solid var(--line-2);
  color:var(--ink-2);
  background:var(--surface);
  border-radius:999px;
  padding:5px 10px;
}
.site-unit-link:hover{border-color:var(--accent);color:var(--accent-ink);background:var(--accent-2)}
.brand { display: flex; align-items: center; gap: 12px; }
.brand h1 { font-size: 18px; margin: 0; font-weight: 900; letter-spacing: -0.01em;}
.brand p { margin: 0; font-size: 12px; color: var(--ink-2); }
.tabs { display: flex; gap: 4px; flex-wrap: wrap; justify-content: flex-start; margin-inline: 0; flex: 1 1 auto; }
.tab {
  background: transparent; border: 0; padding: 6px 11px;
  font-weight: 600; color: var(--ink-2); border-radius: var(--r-sm);
  cursor: pointer; font-size: 13px;
  transition: background .15s, color .15s;
}
.tab:hover { background: var(--accent-2); color: var(--accent-ink); }
.tab.active { background: var(--accent); color: white; }
#unit1-credit-chip {
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
}

/* ---- Layout ---- */
main {
  width: 100%;
  max-width: none;
  margin: 0;
  padding: 24px clamp(16px, 2.2vw, 30px) 64px;
}
.view { display: none; }
.view.active { display: block; animation: fade .25s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(4px); } to {opacity:1; transform: none;} }

.section-head { margin: 0 0 24px; }
.section-head h2 { margin: 0 0 4px; font-size: 28px; letter-spacing: -0.015em; font-weight: 900; }
.section-head p { margin: 0; color: var(--ink-2); }

.muted { color: var(--muted); font-size: 13px; }

/* ---- Hero / dashboard ---- */
.hero {
  display: grid; grid-template-columns: minmax(0,1.4fr) minmax(0,1fr);
  gap: 40px; padding: 40px;
  background: linear-gradient(135deg, var(--surface) 0%, var(--bg) 100%);
  border: 2px solid var(--line);
  border-radius: var(--r-lg);
  margin-bottom: 28px;
  box-shadow: 0 8px 32px rgba(20,32,30,.06);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(0,89,78,.03) 0%, transparent 70%);
  border-radius: 50%;
}
.eyebrow { text-transform: uppercase; letter-spacing: 0.08em; font-size: 11px; font-weight: 700; color: var(--accent); margin: 0 0 8px;}
.hero h2 { font-size: clamp(28px, 3.6vw, 44px); margin: 0 0 14px; letter-spacing: -0.02em; line-height: 1.05; font-weight: 900; }
.lede { font-size: 17px; color: var(--ink-2); margin: 0; max-width: 56ch; }
.stats { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; align-content: start;}
.stat {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-md);
  padding: 18px 16px;
  transition: all .2s ease;
}
.stat:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 12px rgba(0,89,78,.08);
  transform: translateY(-2px);
}
.stat .num { font-size: 28px; font-weight: 900; color: var(--accent); display: block; line-height: 1.05; }
.stat .lbl { font-size: 12px; color: var(--ink-2); text-transform: uppercase; letter-spacing: 0.06em; font-weight: 600; }

@media (max-width: 800px) { .hero { grid-template-columns: 1fr; padding: 28px;} }

@media (max-width: 980px) {
  .topbar { justify-content: center; }
  .tabs {
    width: 100%;
    justify-content: center;
    order: 2;
  }
  #unit1-credit-chip {
    position: static;
    transform: none;
    order: 1;
    width: 100%;
    margin: 0;
    display: flex;
    justify-content: center;
  }
}

.grid-3 {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px;
  margin-bottom: 32px;
}
@media (max-width: 800px) { .grid-3 { grid-template-columns: 1fr; } }
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-md);
  padding: 22px;
}
.card h3 { margin: 0 0 6px; font-size: 18px; font-weight: 700; }
.card p { margin: 0 0 16px; color: var(--ink-2); font-size: 14px; }

/* ---- Aim grid ---- */
.aim-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
@media (max-width: 980px) { .aim-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .aim-grid { grid-template-columns: 1fr; } }
.aim-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-md);
  padding: 18px; cursor: pointer;
  transition: border-color .15s, transform .15s, box-shadow .15s;
}
.aim-card:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.aim-letter {
  width: 36px; height: 36px; border-radius: var(--r-sm);
  background: var(--accent); color: white;
  display: flex; align-items: center; justify-content: center;
  font-weight: 900; font-size: 18px;
  margin-bottom: 12px;
}
.aim-card h4 { margin: 0 0 6px; font-size: 15px; font-weight: 700; }
.aim-card .desc { margin: 0; color: var(--ink-2); font-size: 13px; line-height: 1.45; }
.aim-card .count { display: block; margin-top: 12px; font-size: 12px; color: var(--accent); font-weight: 600; }

/* ---- Buttons ---- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 16px; border-radius: var(--r-sm);
  font-weight: 600; font-size: 14px;
  background: var(--surface); color: var(--ink);
  border: 1px solid var(--line-2);
  cursor: pointer;
  transition: background .15s, border-color .15s, color .15s;
}
.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent); color: white; border-color: var(--accent); }
.btn.primary:hover { background: var(--accent-ink); border-color: var(--accent-ink); }
.btn.ghost { background: transparent; border-color: transparent; }
.btn.big { padding: 12px 20px; font-size: 15px; }
.btn[disabled] { opacity: 0.5; cursor: not-allowed; }

/* ---- Filters ---- */
.filters {
  display: flex; gap: 10px; flex-wrap: wrap;
  margin-bottom: 20px;
  padding: 14px;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-md);
  align-items: center;
}
.filters input, .filters select {
  padding: 8px 10px; border-radius: var(--r-sm);
  border: 1px solid var(--line-2); background: var(--bg);
  font-family: inherit; font-size: 14px; color: var(--ink);
  min-width: 140px;
}
.filters input[type="search"] { min-width: 240px; flex: 1; }

/* ---- Question list ---- */
.qlist { display: flex; flex-direction: column; gap: 10px; }
.qrow {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 16px 18px;
  cursor: pointer;
  transition: border-color .15s;
}
.qrow:hover { border-color: var(--accent); }
.qrow.open { border-color: var(--accent); box-shadow: var(--shadow-sm); }
.qrow-head { display: flex; gap: 14px; align-items: center; justify-content: space-between; flex-wrap: wrap; }
.qrow-meta { display: flex; gap: 8px; align-items: center; flex-wrap: wrap;}
.tag { font-size: 11px; font-weight: 700; padding: 3px 8px; border-radius: 999px; background: var(--accent-2); color: var(--accent-ink); text-transform: uppercase; letter-spacing: 0.05em; }
.tag.id { background: var(--bg); color: var(--ink-2); border: 1px solid var(--line); font-family: var(--mono);}
.tag.marks { background: var(--ink); color: white; }
.tag.verb { background: #FFF4DA; color: #7A5300; }
.qrow-body { font-size: 15px; line-height: 1.55; }
.qrow .scenario { color: var(--ink-2); font-size: 14px; margin-top: 6px; line-height: 1.5; font-style: italic;}
.qrow .question-text { margin: 8px 0 0; }
.source-material {
  margin: 12px 0;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--surface-soft);
}
.source-head {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 6px;
}
.source-text { margin: 0 0 8px; font-size: 14px; color: var(--ink-2); }
.source-list { margin: 0; padding-left: 18px; }
.source-list li { font-size: 13px; margin-bottom: 4px; }
.source-figure { margin-top: 8px; }
.source-svg { width: 100%; max-width: 560px; height: auto; display: block; }
.source-table { width: 100%; border-collapse: collapse; font-size: 13px; margin-top: 8px; }
.source-table th, .source-table td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--line); }
.source-table th { background: var(--surface); }
.qrow .question-text .marks-bracket { color: var(--ink-2); font-weight: 700; margin-left: 6px;}
.qrow .markscheme {
  display: none;
  margin-top: 14px; padding-top: 14px;
  border-top: 1px dashed var(--line-2);
}
.qrow.open .markscheme { display: block; }
.markscheme h5 { margin: 0 0 8px; font-size: 13px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--accent); font-weight: 700; }
.markscheme .instruction { font-size: 14px; margin: 0 0 8px; color: var(--ink-2); }
.markscheme ul { margin: 0 0 8px; padding-left: 20px; }
.markscheme li { font-size: 14px; margin-bottom: 4px; line-height: 1.5; }
.markscheme .additional { font-size: 13px; color: var(--ink-2); font-style: italic; margin-top: 6px;}
.markscheme .donotaccept { color: var(--warn); font-size: 13px; background: var(--warn-bg); border-radius: var(--r-sm); padding: 6px 10px; margin-top: 8px;}
.markscheme table.levels { width: 100%; border-collapse: collapse; margin-top: 8px; font-size: 13px;}
.markscheme table.levels th, .markscheme table.levels td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--line); vertical-align: top;}
.markscheme table.levels th { background: var(--bg); font-weight: 700; }

/* ---- Mock paper ---- */
.mock-controls {
  display: flex; gap: 14px; flex-wrap: wrap; align-items: flex-end;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-md);
  padding: 16px; margin-bottom: 20px;
}
.control { display: flex; flex-direction: column; gap: 6px; }
.control label { font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; font-weight: 700; color: var(--ink-2); }
.control select, .control input { padding: 8px 10px; border-radius: var(--r-sm); border: 1px solid var(--line-2); background: var(--bg); font-family: inherit; font-size: 14px;}
.chip-row { display: flex; gap: 6px; }
.chip {
  font-size: 13px; font-weight: 700;
  padding: 6px 10px; border: 1px solid var(--line-2);
  border-radius: 999px; background: var(--bg);
  cursor: pointer; user-select: none;
  transition: all .15s;
}
.chip.on { background: var(--accent); color: white; border-color: var(--accent); }

.paper {
  background: white;
  color: var(--ink);
  padding: 56px 64px; border-radius: var(--r-md);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-md);
  min-height: 600px;
}
.paper.empty { display: flex; align-items: center; justify-content: center; color: var(--muted); padding: 80px;}
.paper-header { border-bottom: 2px solid var(--ink); padding-bottom: 18px; margin-bottom: 24px; }
.paper-header h3 { margin: 0 0 4px; font-size: 22px; }
.paper-header p { margin: 0; color: var(--ink-2); font-size: 14px; }
.paper-section {
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
}
.paper-section:last-child { border-bottom: 0; }
.paper-section .section-tag { font-weight: 900; font-size: 13px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--ink-2); margin-bottom: 8px; display: flex; align-items: center; gap: 10px;}
.paper-section .section-tag .aim-pill { background: var(--accent); color: #fff; padding: 2px 8px; border-radius: 4px; font-size: 11px; letter-spacing: 0.04em; }
.paper-instructions { font-size: 13px; color: var(--ink-2); font-style: italic; margin-top: 8px; }
.paper-section .scenario {
  background: var(--bg); padding: 14px 18px; border-radius: var(--r-sm); margin: 14px 0 18px;
  font-size: 15px; line-height: 1.55;
}
.paper-section .source-material { margin-bottom: 16px; }
.paper-question { padding-left: 22px; margin-bottom: 14px; position: relative; }
.paper-question .qlabel { position: absolute; left: 0; font-weight: 700; }
.paper-question .qtext { font-size: 15px; }
.paper-question .qtext .marks-bracket { color: var(--ink-2); font-weight: 700; margin-left: 4px; }
.paper-totals { text-align: right; font-weight: 700; font-size: 14px; margin-top: 8px; color: var(--ink-2);}
.paper-mark { font-size: 14px;}
.mock-with-ms .paper-question .ms-block {
  margin-top: 8px; padding: 10px 14px; background: var(--accent-2); border-radius: var(--r-sm);
  font-size: 13px; line-height: 1.5;
}
.mock-with-ms .ms-block ul { margin: 4px 0 0; padding-left: 20px;}
.mock-with-ms .ms-block li { margin-bottom: 3px; }
.mock-with-ms .ms-block table.levels { background: white; }

/* ---- Practice ---- */
.practice-controls {
  display: flex; gap: 12px; flex-wrap: wrap; align-items: center;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-md);
  padding: 14px; margin-bottom: 20px;
}
.practice-controls select { padding: 8px 10px; border-radius: var(--r-sm); border: 1px solid var(--line-2); background: var(--bg); font-family: inherit; font-size: 14px;}

.practice-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-md);
  padding: 28px;
}
.practice-card .scenario { background: var(--bg); padding: 14px 18px; border-radius: var(--r-sm); margin: 16px 0; font-size: 15px;}
.practice-card .source-material { margin-bottom: 14px; }
.practice-card .question { font-size: 17px; font-weight: 600; line-height: 1.5; }
.practice-card textarea {
  width: 100%; min-height: 220px;
  padding: 14px; border-radius: var(--r-sm); border: 1px solid var(--line-2);
  background: var(--bg); font-family: inherit; font-size: 15px; line-height: 1.55;
  resize: vertical; margin-top: 16px;
}
.practice-actions { display: flex; gap: 10px; margin-top: 14px; flex-wrap: wrap; }
.practice-msbox {
  margin-top: 18px; padding: 16px;
  border: 1px solid var(--accent); border-radius: var(--r-sm);
  background: #F1F8F4;
}

/* ---- Spec page ---- */
.spec-aim {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-md);
  padding: 22px; margin-bottom: 16px;
}
.spec-aim h3 { margin: 0 0 6px; }
.spec-aim h3 .letter { display: inline-block; width: 28px; height: 28px; border-radius: var(--r-sm); background: var(--accent); color: white; text-align: center; line-height: 28px; font-weight: 900; margin-right: 10px; }
.spec-topics { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; margin-top: 12px; }
@media (max-width: 700px) { .spec-topics { grid-template-columns: 1fr; } }
.spec-topic {
  background: var(--bg); padding: 10px 12px; border-radius: var(--r-sm); font-size: 13px;
  border: 1px solid var(--line);
}
.spec-topic .code { font-family: var(--mono); color: var(--accent); font-weight: 700; margin-right: 6px;}

/* ---- Footer ---- */
.footer {
  text-align: center; padding: 28px;
  font-size: 13px; color: var(--muted);
  border-top: 1px solid var(--line);
}

/* ---- Print ---- */
@media print {
  .topbar, .footer, .mock-controls, .filters, .practice-controls, .section-head { display: none !important; }
  body, .view, .paper { background: white !important; }
  .paper { box-shadow: none !important; border: 0; padding: 0; }
  .paper-section { page-break-inside: avoid; }
  .paper-question { page-break-inside: avoid; }
  main { padding: 0; max-width: 100%; }
  .mock-with-ms .ms-block { background: #f5f5f5 !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
}

/* loading */
.loading { padding: 60px; text-align: center; color: var(--muted);}
.loader { display: inline-block; width: 28px; height: 28px; border: 3px solid var(--line); border-top-color: var(--accent); border-radius: 50%; animation: spin 0.8s linear infinite; margin-bottom: 12px;}
@keyframes spin { to { transform: rotate(360deg); } }

/* ============================================================
   Answer lines — printable mock paper
   ============================================================ */
.answer-lines { margin: 14px 0 8px; padding: 4px 0; }
.answer-line {
  height: 28px;
  border-bottom: 1px solid #B9C4C0;
  margin-bottom: 0;
}
.answer-line:first-child { border-top: 0; }

/* ============================================================
   Quiz
   ============================================================ */
.quiz-controls {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-md);
  padding: 16px; margin: 18px 0; display: flex; gap: 12px; align-items: center; flex-wrap: wrap;
}
.quiz-controls select {
  padding: 9px 12px; border-radius: var(--r-sm); border: 1px solid var(--line-2);
  background: var(--surface); color: var(--ink); font-family: inherit; font-size: 14px;
}
.quiz-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 28px; margin-top: 12px;
  box-shadow: 0 1px 2px rgba(20,32,30,0.04);
}
.quiz-card .quiz-meta { display: flex; gap: 8px; margin-bottom: 18px; flex-wrap: wrap; }
.quiz-card .quiz-q {
  font-size: 19px; font-weight: 700; line-height: 1.5; color: var(--ink);
  margin: 0 0 22px;
}
.quiz-options { display: grid; gap: 10px; }
.quiz-option {
  display: flex; align-items: center; gap: 14px;
  padding: 14px 18px;
  background: var(--surface); border: 2px solid var(--line);
  border-radius: var(--r-sm);
  cursor: pointer; transition: all 0.12s ease;
  font-size: 15px;
}
.quiz-option:hover { border-color: var(--accent); background: var(--accent-2); }
.quiz-option .opt-letter {
  display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; border-radius: 50%;
  background: white; border: 2px solid var(--line-2);
  font-weight: 700; font-size: 13px; color: var(--ink-2);
  flex-shrink: 0;
}
.quiz-option.selected { border-color: var(--accent); background: var(--accent-2); }
.quiz-option.selected .opt-letter { background: var(--accent); color: white; border-color: var(--accent); }
.quiz-option.correct { border-color: #1A8754; background: #E5F4EC; }
.quiz-option.correct .opt-letter { background: #1A8754; color: white; border-color: #1A8754; }
.quiz-option.wrong { border-color: #C2331E; background: #FAE9E5; }
.quiz-option.wrong .opt-letter { background: #C2331E; color: white; border-color: #C2331E; }
.quiz-option.locked { cursor: default; }
.quiz-card .source-material { margin-top: 10px; }
.quiz-explain {
  margin-top: 18px; padding: 14px 16px;
  background: var(--surface); border-left: 3px solid var(--accent); border-radius: var(--r-sm);
  font-size: 14px; line-height: 1.55;
}
.quiz-explain strong { color: var(--accent); }
.quiz-actions { display: flex; gap: 10px; margin-top: 22px; flex-wrap: wrap; }
.quiz-results-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 36px; text-align: center;
}
.quiz-results-card .score-big {
  font-size: 64px; font-weight: 900; color: var(--accent); line-height: 1;
  font-family: var(--display, inherit);
}
.quiz-results-card .score-pct { font-size: 22px; color: var(--ink-2); margin-top: 6px; }
.quiz-results-bar {
  height: 8px; background: var(--line); border-radius: 4px; overflow: hidden;
  max-width: 400px; margin: 22px auto 12px;
}
.quiz-results-bar > span { display: block; height: 100%; background: var(--accent); transition: width 0.6s ease; }
.quiz-aim-breakdown { display: grid; gap: 8px; max-width: 480px; margin: 24px auto 0; text-align: left; }
.quiz-aim-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 8px 12px; background: var(--bg); border-radius: var(--r-sm);
  font-size: 14px;
}
.quiz-aim-row .label { font-weight: 700; }
.quiz-aim-row .ratio { color: var(--ink-2); font-family: var(--mono); }

/* ============================================================
   Flashcards
   ============================================================ */
.flash-controls {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-md);
  padding: 16px; margin: 18px 0; display: flex; gap: 12px; align-items: center; flex-wrap: wrap;
}
.flash-controls select {
  padding: 9px 12px; border-radius: var(--r-sm); border: 1px solid var(--line-2);
  background: white; font-family: inherit; font-size: 14px;
}
#flash-stage {
  display: flex; flex-direction: column; align-items: center; padding: 16px 0;
}
.flash-card {
  width: 100%; max-width: 640px; height: 360px;
  perspective: 1400px; cursor: pointer;
  margin-bottom: 22px;
}
.flash-card-inner {
  position: relative; width: 100%; height: 100%;
  transform-style: preserve-3d; transition: transform 0.55s cubic-bezier(0.4, 0.0, 0.2, 1);
}
.flash-card.flipped .flash-card-inner { transform: rotateY(180deg); }
.flash-face {
  position: absolute; inset: 0;
  backface-visibility: hidden; -webkit-backface-visibility: hidden;
  display: flex; flex-direction: column; justify-content: center; align-items: center;
  padding: 36px;
  border-radius: var(--r-lg);
  box-shadow: 0 12px 28px rgba(20,32,30,0.10);
  text-align: center;
}
.flash-face.front {
  background: var(--surface); border: 1px solid var(--line);
}
.flash-face.back {
  background: linear-gradient(180deg, #00594E 0%, #006D5F 100%);
  color: white; transform: rotateY(180deg);
}
.flash-face .face-eyebrow {
  font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--ink-2); font-weight: 700; margin-bottom: 14px;
}
.flash-face.back .face-eyebrow { color: rgba(255,255,255,0.7); }
.flash-face .face-content {
  font-size: 22px; font-weight: 700; line-height: 1.4; color: var(--ink);
  max-width: 100%;
}
.flash-face.back .face-content {
  font-size: 17px; font-weight: 500; line-height: 1.55; color: white;
  max-width: 100%;
}
.flash-face .face-hint {
  position: absolute; bottom: 18px; font-size: 12px; color: var(--muted);
  letter-spacing: 0.04em;
}
.flash-face.back .face-hint { color: rgba(255,255,255,0.55); }
.flash-actions { display: flex; gap: 10px; margin-bottom: 14px; flex-wrap: wrap; justify-content: center; }
.flash-actions .btn { min-width: 140px; }
.flash-progress-bar {
  width: 100%; max-width: 640px; height: 6px;
  background: var(--line); border-radius: 3px; overflow: hidden;
  margin-bottom: 14px;
}
.flash-progress-bar > span { display: block; height: 100%; background: var(--accent); transition: width 0.35s ease; }
.flash-counts {
  display: flex; gap: 18px; font-size: 13px; color: var(--ink-2);
  margin-bottom: 8px; justify-content: center;
}
.flash-counts span strong { color: var(--accent); font-family: var(--mono); }

@media (max-width: 700px) {
  .flash-card { height: 320px; }
  .flash-face { padding: 24px; }
  .flash-face .face-content { font-size: 18px; }
  .flash-face.back .face-content { font-size: 15px; }
}

/* ============================================================
   Print refinement — answer lines must show solidly on print
   ============================================================ */
@media print {
  .answer-line {
    border-bottom: 1px solid #444 !important;
    -webkit-print-color-adjust: exact; print-color-adjust: exact;
  }
  .paper-section { page-break-inside: auto; }
  .paper-question { page-break-after: avoid; }
}

/* ============================================================
   Dashboard sections (refinement)
   ============================================================ */
.section-block {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 32px 32px 28px;
  margin-bottom: 22px;
  box-shadow: 0 2px 8px rgba(20,32,30,.04);
  transition: all .2s ease;
}
.section-block:hover {
  border-color: var(--line-2);
  box-shadow: 0 4px 16px rgba(20,32,30,.06);
}
.section-block-head { margin: 0 0 20px; max-width: 64ch; }
.section-block-head .sb-eyebrow {
  display: inline-block; font-family: var(--mono);
  font-size: 11px; font-weight: 500; letter-spacing: 0.06em;
  color: var(--accent); margin-bottom: 8px;
  padding: 3px 10px; background: var(--accent-2); border-radius: 999px;
}
.section-block-head h3 {
  margin: 0 0 4px; font-size: 22px; font-weight: 900; letter-spacing: -0.01em;
}
.section-block-head p { margin: 0; color: var(--ink-2); font-size: 14px; }

.section-block .grid-3,
.section-block .grid-2,
.section-block .grid-1 { margin-bottom: 0; }
.grid-1 {
  display: grid; grid-template-columns: 1fr; gap: 16px;
}
.grid-2 {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
}
@media (max-width: 800px) { .grid-2 { grid-template-columns: 1fr; } }

.primary-card {
  position: relative;
  border: 1.5px solid var(--accent);
  background: linear-gradient(180deg, #F4FAF7 0%, #FFFFFF 60%);
  box-shadow: 0 4px 12px rgba(0,89,78,.08);
  transition: all .2s ease;
}
.primary-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0,89,78,.12);
}
.primary-card .card-tag {
  position: absolute; top: 14px; right: 14px;
  font-size: 10px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase;
  background: var(--accent); color: white;
  padding: 3px 8px; border-radius: 4px;
}
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-md);
  padding: 22px;
  transition: all .2s ease;
}
.card:hover {
  border-color: var(--line-2);
  box-shadow: 0 4px 16px rgba(20,32,30,.06);
  transform: translateY(-2px);
}
.card h3 { margin: 0 0 6px; font-size: 18px; font-weight: 700; }
.card p { margin: 0 0 16px; color: var(--ink-2); font-size: 14px; }

@media (max-width: 700px) {
  .section-block { padding: 24px 20px; }
}

/* ============================================================
   Mock paper — header & print options
   ============================================================ */
.mock-controls { flex-direction: column; align-items: stretch; gap: 16px; }
.mock-row {
  display: flex; gap: 14px; flex-wrap: wrap; align-items: flex-end;
}
.control.checkbox { gap: 0; flex-direction: row; align-items: center; }
.control.checkbox label {
  display: inline-flex; align-items: center; gap: 8px;
  text-transform: none; letter-spacing: 0; font-weight: 600;
  font-size: 14px; color: var(--ink); cursor: pointer;
}
.control.checkbox input[type="checkbox"] {
  width: 16px; height: 16px; accent-color: var(--accent); cursor: pointer;
}
.mock-options {
  border: 1px solid var(--line); border-radius: var(--r-sm);
  padding: 14px 16px; background: var(--bg);
}
.mock-options[open] { padding-bottom: 16px; }
.mock-options summary {
  font-weight: 700; cursor: pointer; user-select: none;
  font-size: 14px; color: var(--ink); padding: 2px 0;
  list-style: none;
}
.mock-options summary::-webkit-details-marker { display: none; }
.mock-options summary::before {
  content: "▸"; display: inline-block; margin-right: 8px;
  color: var(--accent); transition: transform .15s;
}
.mock-options[open] summary::before { transform: rotate(90deg); }
.mock-options .mock-row { margin-top: 14px; }
.mock-actions {
  display: flex; gap: 10px; flex-wrap: wrap;
  padding-top: 4px; border-top: 1px dashed var(--line); padding-top: 16px;
}

/* Candidate header lines on the paper */
.candidate-header {
  display: grid; grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 14px 28px;
  margin-bottom: 18px; padding-bottom: 14px;
  border-bottom: 1px solid var(--line-2);
}
.candidate-header .ch-line {
  display: flex; align-items: baseline; gap: 10px;
  font-size: 14px; color: var(--ink);
}
.candidate-header .ch-label {
  font-weight: 700; min-width: 64px;
}
.candidate-header .ch-fill {
  flex: 1; border-bottom: 1px solid var(--ink-2);
  height: 22px;
}
.candidate-header.full-width { grid-template-columns: 1fr; }
.candidate-header .ch-custom {
  grid-column: 1 / -1; font-style: italic;
  color: var(--ink-2); font-size: 13px;
  border-bottom: 0; padding-bottom: 0;
}

/* ============================================================
   Practice mode — auto-mark
   ============================================================ */
.automark-box {
  margin-top: 18px; padding: 18px;
  border: 1px solid var(--accent); border-radius: var(--r-md);
  background: var(--surface);
}
.automark-head {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  margin-bottom: 10px;
}
.automark-head .am-eyebrow {
  font-size: 11px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--accent);
}
.automark-score {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 26px; font-weight: 900; color: var(--accent);
  font-family: var(--mono);
}
.automark-score .total { color: var(--ink-2); font-weight: 700; font-size: 18px; }
.automark-adjust { display: inline-flex; gap: 6px; }
.automark-adjust .btn {
  padding: 4px 10px; font-size: 13px; min-width: 36px;
}
.automark-detail {
  margin-top: 14px; font-size: 13px; line-height: 1.55; color: var(--ink-2);
}
.automark-detail ul { margin: 6px 0 0; padding-left: 18px; }
.automark-detail li { margin-bottom: 4px; }
.automark-hits .hit { color: #1A8754; }
.automark-hits .miss { color: var(--ink-2); }
[data-theme="dark"] .automark-hits .hit { color: #4ade80; }
.automark-hits .hit::before { content: "✓ "; font-weight: 700; }
.automark-hits .miss::before { content: "○ "; }
.automark-level {
  display: inline-block; padding: 3px 10px; border-radius: 999px;
  font-size: 12px; font-weight: 700; background: var(--accent-2); color: var(--accent-ink);
  margin-left: 8px;
}

/* ============================================================
   Spec page — polish
   ============================================================ */
.spec-jump {
  display: flex; flex-wrap: wrap; gap: 8px;
  margin: 0 0 22px;
  padding: 14px 16px;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--r-md);
  align-items: center;
}
.spec-jump .sj-label {
  font-size: 11px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--ink-2); margin-right: 6px;
}
.spec-jump a {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 12px; border-radius: 999px;
  background: var(--bg); border: 1px solid var(--line-2);
  color: var(--ink); text-decoration: none;
  font-size: 13px; font-weight: 700;
  transition: all .15s;
}
.spec-jump a:hover {
  background: var(--accent); color: white; border-color: var(--accent);
}
.spec-jump a .sj-letter {
  font-family: var(--mono); font-weight: 700; color: var(--accent);
}
.spec-jump a:hover .sj-letter { color: white; }

.spec-aim {
  padding: 28px 28px 24px;
  margin-bottom: 18px;
  scroll-margin-top: 90px;
}
.spec-aim-head {
  display: flex; align-items: flex-start; gap: 18px;
  padding-bottom: 16px; margin-bottom: 18px;
  border-bottom: 2px solid var(--accent);
}
.spec-aim-letter {
  width: 56px; height: 56px; border-radius: var(--r-md);
  background: var(--accent); color: white;
  display: flex; align-items: center; justify-content: center;
  font-weight: 900; font-size: 28px; flex-shrink: 0;
  letter-spacing: -0.01em;
}
.spec-aim-title {
  flex: 1; min-width: 0;
}
.spec-aim-title h3 {
  margin: 0 0 4px; font-size: 22px; font-weight: 900; letter-spacing: -0.01em;
  line-height: 1.2;
}
.spec-aim-title .spec-aim-sub {
  margin: 0; color: var(--ink-2); font-size: 14px; line-height: 1.5;
}
.spec-aim-count {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 12px; border-radius: 999px;
  background: var(--accent-2); color: var(--accent-ink);
  font-size: 12px; font-weight: 700; letter-spacing: 0.04em;
  flex-shrink: 0; align-self: flex-start;
}
.spec-aim-count .num { font-family: var(--mono); font-size: 14px; }

.spec-topics {
  grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 0;
}
@media (max-width: 900px) { .spec-topics { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .spec-topics { grid-template-columns: 1fr; } }
.spec-topic {
  padding: 12px 14px; line-height: 1.45;
  display: flex; align-items: flex-start; gap: 8px;
  transition: border-color .15s, background .15s;
}
.spec-topic:hover { border-color: var(--accent); background: white; }

@media (max-width: 700px) {
  .spec-aim { padding: 22px 18px; }
  .spec-aim-letter { width: 44px; height: 44px; font-size: 22px; }
  .spec-aim-title h3 { font-size: 18px; }
}

/* ============================================================
   Print — mark scheme only mode
   ============================================================ */
@media print {
  body.print-ms-only .paper-section .answer-lines,
  body.print-ms-only .paper-instructions,
  body.print-ms-only .paper-section .scenario,
  body.print-ms-only .candidate-header { display: none !important; }
  body.print-ms-only .paper { background: white; }
  body.print-ms-only .ms-block {
    display: block !important;
    margin-top: 8px; padding: 12px 14px;
    background: #F1F8F4 !important; border: 1px solid #00594E;
    border-radius: 4px;
    -webkit-print-color-adjust: exact; print-color-adjust: exact;
  }
  body.print-ms-only .paper-question { padding-left: 0; }
}

/* The ms-block must always render (not just when toggle "show ms" is on) when printing in ms-only mode.
   We force-show via .force-ms class added before print. */
.paper.force-ms .paper-question .ms-block,
.paper.force-ms .paper-section .ms-block { display: block; }

/* ============================================================
   XP toast + progress sidebar
   ============================================================ */
.xp-earned-toast {
  position: fixed;
  right: 20px;
  bottom: 24px;
  z-index: 120;
  background: linear-gradient(135deg, #ffcc33, #ff9500);
  color: #2f2100;
  border-radius: 999px;
  padding: 10px 16px;
  font-weight: 900;
  box-shadow: 0 12px 28px rgba(20, 32, 30, 0.18);
  transform: translateY(16px);
  opacity: 0;
  pointer-events: none;
  transition: all .2s ease;
}
.xp-earned-toast.show { transform: translateY(0); opacity: 1; }

.u1-progress-sidebar {
  position: fixed;
  right: 16px;
  top: 90px;
  width: 292px;
  max-height: calc(100vh - 110px);
  overflow: auto;
  z-index: 70;
  background: linear-gradient(180deg, #113635 0%, #0a2626 100%);
  color: #f8fffd;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,0.14);
  box-shadow: 0 14px 36px rgba(0,0,0,0.25);
  padding: 12px;
}
.u1-progress-sidebar.hidden { display: none; }
.u1-sb-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
.u1-sb-chip {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .08em;
  font-weight: 800;
  color: #ffe8a7;
}
.u1-sb-close {
  background: transparent;
  color: rgba(255,255,255,0.7);
  border: 0;
  cursor: pointer;
}
.u1-sb-kpi {
  display: flex;
  align-items: center;
  gap: 10px;
  border-radius: 12px;
  padding: 10px;
  margin-bottom: 8px;
}
.u1-sb-kpi.xp { background: linear-gradient(135deg, rgba(255,195,25,0.2), rgba(255,149,0,0.15)); }
.u1-sb-kpi.streak { background: linear-gradient(135deg, rgba(255,85,60,0.18), rgba(255,32,80,0.12)); }
.u1-sb-kpi .kpi-emoji { font-size: 20px; }
.u1-sb-kpi .kpi-label { font-size: 12px; opacity: .8; }
.u1-sb-kpi .kpi-value { font-size: 20px; font-weight: 900; line-height: 1.1; }
.u1-sb-progress {
  height: 10px;
  border-radius: 999px;
  background: rgba(255,255,255,0.14);
  overflow: hidden;
}
.u1-sb-progress > span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, #ffe066, #ff9f1c);
}
.u1-sb-note { font-size: 12px; opacity: .75; margin: 8px 0 10px; }
.u1-sb-mini-title {
  margin-top: 10px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .08em;
  font-weight: 800;
  color: #9fd7d1;
}
.u1-sb-mini-list { margin-top: 6px; }
.u1-sb-mini-row {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  padding: 6px 0;
  font-size: 13px;
}
.u1-sb-mini-row strong { color: #ffe8a7; }
.u1-sb-empty { font-size: 12px; opacity: .7; margin-top: 4px; }
.u1-sb-btn {
  width: 100%;
  justify-content: center;
  margin-top: 10px;
  background: #27c46b;
  border-color: #27c46b;
}
.u1-sidebar-toggle {
  display: none;
  position: fixed;
  right: 12px;
  bottom: 14px;
  z-index: 72;
  border: 0;
  background: #0d3d3c;
  color: #fff;
  font-weight: 800;
  border-radius: 999px;
  padding: 10px 14px;
  box-shadow: 0 10px 24px rgba(0,0,0,0.22);
}

@media (min-width: 1101px) {
  body.has-u1-sidebar main { padding-right: 340px; }
}

@media (max-width: 1100px) {
  .u1-progress-sidebar {
    right: 10px;
    top: auto;
    bottom: 58px;
    max-height: min(68vh, 540px);
    transform: translateY(18px);
    opacity: 0;
    pointer-events: none;
    transition: all .2s ease;
  }
  .u1-progress-sidebar.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .u1-sidebar-toggle { display: inline-flex; }
}

/* ============================================================
   Progress tab visual refresh
   ============================================================ */
.prog-xp-hero {
  border-radius: 16px;
  padding: 18px;
  background: linear-gradient(145deg, #ffe99f, #ffd05f);
  border: 1px solid #f3c243;
  margin-bottom: 12px;
}
.prog-xp-eyebrow {
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: #6b4c00;
}
.prog-xp-number {
  font-size: clamp(2rem, 6vw, 3.2rem);
  line-height: 1;
  font-weight: 900;
  color: #3d2a00;
  margin: 6px 0;
}
.prog-xp-sub { font-size: 13px; color: #6b4c00; }
.prog-xp-bar {
  margin-top: 8px;
  height: 12px;
  border-radius: 999px;
  overflow: hidden;
  background: rgba(61,42,0,0.12);
}
.prog-xp-bar > span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, #ff8c00, #ff4d00);
}
.prog-xp-foot { margin-top: 8px; font-size: 13px; color: #6b4c00; }
.prog-mini-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 10px;
  margin-bottom: 18px;
}
.prog-mini-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px;
  text-align: center;
}
.prog-mini-card .v { font-size: 1.25rem; font-weight: 900; color: var(--accent); }
.prog-mini-card .k { font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-2); }

.prog-aim-accuracy {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px;
  margin-bottom: 12px;
}
.prog-aim-accuracy h3 { margin: 0 0 12px; }
.prog-aim-row { margin-bottom: 10px; }
.prog-aim-row .meta { display: flex; justify-content: space-between; font-size: 13px; margin-bottom: 4px; }
.prog-aim-row .bar {
  height: 10px;
  border-radius: 999px;
  background: #ecefe8;
  overflow: hidden;
}
.prog-aim-row .bar > span { display: block; height: 100%; }
.prog-aim-row .bar.good > span { background: #2bbf63; }
.prog-aim-row .bar.mid > span { background: #f0a126; }
.prog-aim-row .bar.bad > span { background: #e34a4a; }

.prog-weak-wrap {
  border-radius: 14px;
  padding: 16px;
  margin-bottom: 14px;
  border: 1px solid #f2a3a3;
  background: linear-gradient(140deg, #fff0f0, #ffd7d7);
}
.prog-weak-wrap h3 { margin: 0; }
.prog-weak-wrap p { margin: 4px 0 12px; color: #8f2b2b; font-size: 13px; }
.prog-weak-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 8px; margin-bottom: 12px; }
.prog-weak-card {
  background: rgba(255,255,255,0.8);
  border: 1px solid #f2baba;
  border-radius: 10px;
  padding: 10px;
  display: flex;
  justify-content: space-between;
  font-weight: 800;
  color: #982c2c;
}

.prog-history-title {
  margin: 0 0 10px;
  font-size: 1.1rem;
  font-weight: 800;
}
.prog-session-card {
  background: #fff;
  border: 1px solid var(--line);
  border-left: 6px solid #f0a126;
  border-radius: 12px;
  padding: 12px 14px;
  margin-bottom: 8px;
  display: flex;
  justify-content: space-between;
  gap: 8px;
  flex-wrap: wrap;
}
.prog-session-card.good { border-left-color: #2bbf63; }
.prog-session-card.mid { border-left-color: #f0a126; }
.prog-session-card.bad { border-left-color: #e34a4a; }
.prog-session-card .t { font-weight: 800; font-size: 14px; }
.prog-session-card .d, .prog-session-card .a { font-size: 12px; color: var(--ink-2); margin-left: 6px; }
.prog-session-card .s { font-weight: 800; }

.prog-empty {
  background: #fff;
  border: 1px dashed var(--line-2);
  border-radius: 12px;
  padding: 18px;
  color: var(--ink-2);
  text-align: center;
}

/* ============================================================
   Diagram questions
   ============================================================ */
.diagram-space {
  position: relative;
  margin: 14px 0 8px;
  height: 480px;
  border: 1px solid var(--line-2);
  border-radius: var(--r-sm);
  background:
    linear-gradient(white, white),
    repeating-linear-gradient(0deg, transparent 0 27px, #E8ECE6 27px 28px),
    repeating-linear-gradient(90deg, transparent 0 27px, #F2F4EE 27px 28px);
  background-size: 100% 100%, 100% 100%, 100% 100%;
  background-blend-mode: normal, multiply, multiply;
}
.diagram-space .ds-label {
  position: absolute; top: 10px; left: 14px;
  font-size: 12px; color: var(--muted);
  text-transform: uppercase; letter-spacing: 0.06em; font-weight: 600;
  background: rgba(255,255,255,0.85); padding: 2px 8px; border-radius: 4px;
}

/* Sketch pad in practice mode */
.sketch-wrap {
  margin-top: 16px;
  border: 1px solid var(--line-2);
  border-radius: var(--r-md);
  background: var(--bg);
  padding: 12px;
}
.sketch-toolbar {
  display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 10px;
}
.sketch-toolbar .btn { padding: 6px 12px; font-size: 13px; }
.sketch-canvas {
  display: block; width: 100%; height: 480px;
  background: white;
  border: 1px solid var(--line-2);
  border-radius: var(--r-sm);
  cursor: crosshair;
  touch-action: none;
}
.sketch-hint { display: block; margin-top: 8px; font-size: 12px; }

/* Self-mark UI for diagrams */
.selfmark-list {
  display: flex; flex-direction: column; gap: 8px;
  margin-top: 10px;
}
.selfmark-row {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 10px 14px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  cursor: pointer;
  font-size: 14px; line-height: 1.5;
  transition: border-color .12s, background .12s;
}
.selfmark-row:hover { border-color: var(--accent); }
.selfmark-row input[type="checkbox"] {
  width: 18px; height: 18px; accent-color: var(--accent);
  margin-top: 2px; cursor: pointer; flex-shrink: 0;
}
.selfmark-row input[type="checkbox"]:checked + span { color: var(--accent-ink); }

/* Diagram space prints with a clean grid */
@media print {
  .diagram-space {
    height: 480px;
    background: white !important;
    border: 1px solid #444 !important;
    -webkit-print-color-adjust: exact; print-color-adjust: exact;
    page-break-inside: avoid;
  }
  .diagram-space .ds-label { display: none; }
  .sketch-wrap, .sketch-toolbar, .sketch-canvas, .sketch-hint { display: none !important; }
}

/* ============================================================
   Spec hierarchy — A1, then A1.1/A1.2 nested beneath
   ============================================================ */
.spec-groups {
  display: flex; flex-direction: column; gap: 18px;
}
.spec-group {
  border-left: 3px solid var(--accent-2);
  padding-left: 18px;
}
.spec-group-head {
  display: flex; align-items: baseline; gap: 12px;
  margin-bottom: 10px; padding: 4px 0;
}
.spec-group-head .sg-code {
  font-family: var(--mono); font-weight: 700;
  font-size: 14px; color: var(--accent);
  background: var(--accent-2); padding: 4px 10px;
  border-radius: 4px; flex-shrink: 0;
  letter-spacing: 0.02em;
}
.spec-group-head .sg-name {
  font-size: 16px; font-weight: 700; color: var(--ink);
  line-height: 1.4;
}
.spec-subtopics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-left: 0;
}
@media (max-width: 800px) { .spec-subtopics { grid-template-columns: 1fr; } }
.spec-subtopic {
  display: flex; align-items: flex-start; gap: 10px;
  padding: 10px 12px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  font-size: 13px; line-height: 1.5;
  transition: border-color .12s, background .12s;
}
.spec-subtopic:hover { border-color: var(--accent); background: white; }
.spec-subtopic .code {
  font-family: var(--mono); font-weight: 700;
  color: var(--accent); flex-shrink: 0;
  font-size: 12px;
  padding-top: 1px;
}

/* Keep the inner spec-subtopic styles overriding the older .spec-topics class — clear unused */
.spec-aim .spec-topics { display: none; }

/* ============================================================
   Multiple-choice questions (mock paper + practice)
   ============================================================ */
.label-hint { color: var(--muted); font-weight: 400; font-size: 11px; }
.control.wide { flex: 1 1 100%; }

/* Mock paper printed/on-screen MC options */
.mc-options {
  list-style: none; padding: 0; margin: 14px 0 6px 0;
  display: flex; flex-direction: column; gap: 10px;
}
.mc-options li {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 10px 14px; border: 1px solid var(--line);
  border-radius: var(--r-sm); background: white;
  font-size: 14px; line-height: 1.5;
}
.mc-options .mc-tick {
  width: 18px; height: 18px; flex-shrink: 0;
  border: 2px solid #14201E; border-radius: 3px;
  margin-top: 1px; background: white;
}
.mc-options .mc-letter {
  font-weight: 700; min-width: 22px; flex-shrink: 0;
  font-family: var(--mono); color: var(--accent);
}
.mc-options .mc-text { flex: 1; }
.mc-instr { font-size: 12px; color: var(--muted); margin: 6px 0 0 0; font-style: italic; }

/* MC mark scheme styling */
.markscheme .mc-answer { font-size: 14px; margin: 6px 0; }
.markscheme .mc-correct {
  background: #e8f5f0; padding: 2px 8px; border-radius: 4px;
  font-family: var(--mono); font-weight: 700; color: var(--accent);
}

/* Practice mode interactive MC */
.mc-practice {
  display: flex; flex-direction: column; gap: 8px;
  margin: 14px 0 6px 0;
}
.mc-practice-row {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 12px 14px; border: 1px solid var(--line);
  border-radius: var(--r-sm); background: var(--bg);
  cursor: pointer; transition: border-color .12s, background .12s;
  font-size: 14px; line-height: 1.5;
}
.mc-practice-row:hover { border-color: var(--accent); background: white; }
.mc-practice-row input[type="radio"] {
  margin: 4px 0 0 0; flex-shrink: 0;
  accent-color: var(--accent);
  width: 16px; height: 16px;
}
.mc-practice-row:has(input:checked) {
  border-color: var(--accent); background: #e8f5f0;
}
.mc-practice-letter {
  font-family: var(--mono); font-weight: 700;
  color: var(--accent); min-width: 22px; flex-shrink: 0;
}
.mc-practice-text { flex: 1; }

.automark-score.am-good .value { color: var(--accent); }
.automark-score.am-bad  .value { color: var(--warn, #c0392b); }

/* Dark-mode contrast fixes for panels that used white backgrounds */
[data-theme="dark"] .paper,
[data-theme="dark"] .mock-with-ms .ms-block table.levels,
[data-theme="dark"] .spec-topic:hover,
[data-theme="dark"] .spec-subtopic:hover,
[data-theme="dark"] .mc-options li,
[data-theme="dark"] .mc-options .mc-tick,
[data-theme="dark"] .mc-practice-row:hover,
[data-theme="dark"] .diagram-space,
[data-theme="dark"] .sketch-canvas,
[data-theme="dark"] .prog-mini-card,
[data-theme="dark"] .prog-aim-accuracy,
[data-theme="dark"] .prog-session-card,
[data-theme="dark"] .prog-empty {
  background: var(--surface);
  color: var(--ink);
}

[data-theme="dark"] .diagram-space .ds-label {
  background: color-mix(in oklab, var(--surface) 90%, transparent);
  color: var(--ink-2);
}

[data-theme="dark"] .prog-aim-row .bar {
  background: var(--line);
}

[data-theme="dark"] .filters select,
[data-theme="dark"] .filters input,
[data-theme="dark"] .control select,
[data-theme="dark"] .control input,
[data-theme="dark"] .practice-controls select,
[data-theme="dark"] .quiz-controls select,
[data-theme="dark"] .flash-controls select,
[data-theme="dark"] option {
  background: var(--surface);
  color: var(--ink);
}

[data-theme="dark"] .paper {
  background: var(--surface);
  color: var(--ink);
}

@media print {
  .mc-options li { break-inside: avoid; border-color: #444; }
  .mc-options .mc-tick { border-color: #000; }
  .mc-options .mc-letter { color: #000; }
}

/* ── Primary card (dashboard featured card) ── */
[data-theme="dark"] .primary-card {
  background: color-mix(in oklab, var(--accent) 12%, var(--surface)) !important;
}
[data-theme="dark"] .primary-card h3,
[data-theme="dark"] .primary-card p {
  color: var(--ink) !important;
}

/* ── Tag marks badge (dark ink bg → near-white in dark mode) ── */
[data-theme="dark"] .tag.marks {
  background: var(--ink) !important;
  color: var(--bg) !important;
}

/* ── Dark-mode: quiz option correct/wrong/letter, tags, progress ── */
[data-theme="dark"] .quiz-option .opt-letter {
  background: var(--line) !important;
  border-color: var(--line-2) !important;
  color: var(--ink) !important;
}
[data-theme="dark"] .quiz-option.correct {
  background: color-mix(in oklab, #1A8754 20%, var(--surface)) !important;
  border-color: #2bbf63 !important;
  color: var(--ink) !important;
}
[data-theme="dark"] .quiz-option.wrong {
  background: color-mix(in oklab, #C2331E 20%, var(--surface)) !important;
  border-color: #e34a4a !important;
  color: var(--ink) !important;
}
[data-theme="dark"] .tag.verb {
  background: color-mix(in oklab, #b45309 22%, var(--surface)) !important;
  color: #fbbf24 !important;
}
[data-theme="dark"] .prog-weak-wrap {
  background: color-mix(in oklab, #c2331e 16%, var(--surface)) !important;
  border-color: #9b2c1c !important;
  color: var(--ink) !important;
}
[data-theme="dark"] .prog-weak-wrap p,
[data-theme="dark"] .prog-weak-wrap h3 {
  color: #fca5a5 !important;
}
[data-theme="dark"] .prog-weak-card {
  background: color-mix(in oklab, #c2331e 10%, var(--surface)) !important;
  border-color: #9b2c1c !important;
  color: #fca5a5 !important;
}
[data-theme="dark"] .prog-xp-card {
  background: color-mix(in oklab, #b45309 20%, var(--surface)) !important;
  color: var(--ink) !important;
}
[data-theme="dark"] .prog-xp-number,
[data-theme="dark"] .prog-xp-eyebrow,
[data-theme="dark"] .prog-xp-sub,
[data-theme="dark"] .prog-xp-foot {
  color: #fcd34d !important;
}

/* --- Enhanced dark mode for podium and revision page --- */
[data-theme="dark"] .lb-podium-shell,
[data-theme="dark"] .lb-row-wrap {
  background: linear-gradient(145deg, rgba(30,40,36,0.85), rgba(9,31,26,0.7));
  box-shadow: 0 0 0 1.5px var(--accent), 0 4px 32px 0 rgba(0,0,0,0.22), 0 0 16px 2px var(--accent-2);
  border: 1.5px solid var(--accent-2);
  backdrop-filter: blur(6px) saturate(120%);
}
[data-theme="dark"] .lb-podium-head, [data-theme="dark"] .lb-podium-grid, [data-theme="dark"] .lb-row-wrap {
  color: var(--ink);
}
[data-theme="dark"] .lb-row-wrap.lb-top-1 { box-shadow: 0 0 0 2px #ffd70088, 0 0 16px 2px #ffd70044, 0 4px 32px 0 rgba(0,0,0,0.22); }
[data-theme="dark"] .lb-row-wrap.lb-top-2 { box-shadow: 0 0 0 2px #c0c0c088, 0 0 12px 2px #c0c0c044, 0 4px 32px 0 rgba(0,0,0,0.22); }
[data-theme="dark"] .lb-row-wrap.lb-top-3 { box-shadow: 0 0 0 2px #cd7f3288, 0 0 10px 2px #cd7f3244, 0 4px 32px 0 rgba(0,0,0,0.22); }
[data-theme="dark"] .revision-app-grid, [data-theme="dark"] .rev-flow-grid, [data-theme="dark"] .primary-card {
  background: color-mix(in oklab, var(--surface) 96%, var(--accent) 4%) !important;
  border-color: var(--line-2) !important;
}

/* Keep chip visible in unit pages so users can see usable credits for this unit */
#unit1-credit-chip {
  display: flex !important;
}

@media (max-width: 768px) {
  .topbar { flex-wrap: wrap; gap: 8px; padding: 8px 10px; height: auto; }
  .site-unit-nav{order:1;width:100%;gap:6px}
  .site-unit-link{font-size:10px;padding:4px 8px}
  body.ra10-refresh-enabled .topbar .tabs {
    border-radius: 20px !important;
    padding: 6px !important;
    gap: 6px !important;
    border-width: 1px !important;
  }
  body.ra10-refresh-enabled .topbar .tabs .tab,
  body.ra10-refresh-enabled .topbar .tab {
    border-radius: 12px !important;
    padding: 6px 12px !important;
    min-height: 34px !important;
    border-width: 1px !important;
  }
  #unit1-credit-chip {
    position: static;
    transform: none;
    order: 2;
    width: 100%;
    justify-content: center;
  }
  .topbar .tabs { flex-wrap: wrap; gap: 4px; order: 3; width: 100%; }
  .tab { font-size: 0.78rem; padding: 6px 10px; }
  .brand h1 { font-size: 1rem; }
  .brand p { display: none; }
  main { padding-left: 12px; padding-right: 12px; padding-bottom: 88px; }
  .mock-controls { padding: 12px; }
  .mock-row { flex-direction: column; gap: 12px; }
  .control { width: 100%; }
  .control label { font-size: 0.8rem; }
  .control select, .control input[type="text"] { width: 100%; font-size: 0.9rem; }
  .chip-row { gap: 6px; flex-wrap: wrap; }
  .chip { font-size: 0.72rem; padding: 4px 10px; }
  .mock-actions { flex-direction: column; gap: 8px; }
  .mock-actions button { width: 100%; justify-content: center; }
  .paper-section { padding: 12px; }
  .paper-header h3 { font-size: 1rem; }
  .answer-line { margin-bottom: 28px; }
  .practice-controls, .quiz-controls, .flash-controls { flex-direction: column; gap: 8px; }
  .practice-controls select, .quiz-controls select, .flash-controls select { width: 100%; }
  .filters { flex-direction: column; gap: 8px; }
  .filters input, .filters select { width: 100%; }
  .section-head { padding: 16px 12px 8px; }
  .section-head h2 { font-size: 1.1rem; }
  .flash-card { min-height: 200px; }
  .face-content { font-size: 0.9rem; }
  .automark-box { padding: 12px; }
  .aim-grid { grid-template-columns: repeat(2, 1fr); }
  .grid-3, .grid-2, .grid-1 { grid-template-columns: 1fr; }
  .diagram-tool-wrap { overflow-x: auto; }
  .diagram-canvas { min-width: 600px; }
  .practice-actions { flex-wrap: wrap; gap: 6px; }
  .practice-actions button { flex: 1; min-width: 120px; }
}

@media (max-width: 480px) {
  .aim-grid { grid-template-columns: 1fr; }
  .flash-actions { flex-wrap: wrap; justify-content: center; }
}

/* ====================================================
   COMPREHENSIVE REVISION GUIDE STYLES
   ==================================================== */

#view-guide { padding: 0 !important; }
.guide-shell { display: flex; min-height: 100vh; align-items: flex-start; }

/* --- Sidebar --- */
.guide-sidebar {
  width: 224px; min-width: 224px; flex-shrink: 0;
  background: var(--surface); border-right: 1px solid var(--line);
  position: sticky; top: 0; height: 100vh; overflow-y: auto; z-index: 5;
}
.guide-sidebar-hd {
  padding: 12px 14px 8px; border-bottom: 1px solid var(--line);
  display: flex; align-items: center; justify-content: space-between;
}
.guide-toc-label {
  font-size: 0.68rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.1em; color: var(--ink-2);
}
.guide-toc-scroll { padding: 6px 8px 16px; }
.guide-toc-aim-group { margin-bottom: 2px; }
.guide-toc-aim-link {
  display: flex; align-items: center; gap: 8px;
  padding: 6px 8px; border-radius: var(--r-sm);
  text-decoration: none; font-size: 0.79rem; font-weight: 600;
  color: var(--ink); cursor: pointer; transition: background 0.15s;
  border: none; background: none; width: 100%; text-align: left;
  font-family: var(--font);
}
.guide-toc-aim-link:hover { background: rgba(0,0,0,0.04); }
[data-theme="dark"] .guide-toc-aim-link:hover { background: rgba(255,255,255,0.06); }
.guide-toc-aim-link.active { background: var(--accent); color: #f6fffc; }
.guide-toc-badge {
  width: 20px; height: 20px; border-radius: 4px;
  background: var(--accent); color: #f6fffc;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.68rem; font-weight: 800; flex-shrink: 0;
}
.guide-toc-aim-link.active .guide-toc-badge {
  background: rgba(255,255,255,0.18);
  color: #f6fffc;
}
.guide-toc-topic-links { padding-left: 10px; margin-bottom: 4px; }
.guide-toc-topic-link {
  display: block; padding: 2px 8px; font-size: 0.73rem;
  color: var(--ink-2); text-decoration: none; border-radius: var(--r-sm);
  cursor: pointer; transition: color 0.15s, background 0.15s;
  border: none; background: none; width: 100%; text-align: left;
  font-family: var(--font);
}
.guide-toc-topic-link:hover { color: var(--accent); }
.guide-toc-topic-link.active { color: var(--accent); font-weight: 600; }

/* --- Main content area --- */
.guide-main { flex: 1; min-width: 0; padding: 0 28px 56px; }
.guide-gallery {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 0 0 26px;
}
.guide-gallery-card {
  position: relative;
  min-height: 190px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background-image: linear-gradient(180deg, rgba(9,31,26,0.12) 0%, rgba(9,31,26,0.82) 100%), var(--guide-card-image);
  background-size: cover;
  background-position: center;
  color: #f6fffc;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  align-items: flex-start;
  gap: 8px;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}
.guide-gallery-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: color-mix(in srgb, var(--accent) 45%, white);
}
.guide-gallery-kicker {
  display: inline-flex;
  align-items: center;
  padding: 5px 9px;
  border-radius: 999px;
  background: rgba(255,255,255,0.16);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.guide-gallery-title {
  font-size: 1.02rem;
  font-weight: 800;
  line-height: 1.2;
}
.guide-gallery-copy {
  max-width: 28ch;
  font-size: 0.8rem;
  line-height: 1.45;
  color: rgba(246,255,252,0.92);
}
.guide-gallery-source {
  font-size: 0.68rem;
  color: rgba(246,255,252,0.78);
}
.guide-topbar {
  position: sticky; top: 0; background: var(--bg);
  border-bottom: 1px solid var(--line); padding: 9px 0;
  display: flex; align-items: center; gap: 10px;
  z-index: 4; margin-bottom: 28px;
}
.guide-progress-track {
  flex: 1; height: 7px; background: var(--line);
  border-radius: 99px; overflow: hidden;
}
.guide-progress-fill {
  height: 100%; background: #22c55e;
  border-radius: 99px; transition: width 0.4s ease;
}
.guide-progress-text {
  font-size: 0.77rem; color: var(--ink-2);
  white-space: nowrap; min-width: 90px; text-align: right;
}
.guide-print-btn {
  padding: 5px 11px; border: 1px solid var(--line);
  border-radius: var(--r-sm); background: var(--surface);
  color: var(--ink-2); font-size: 0.76rem; cursor: pointer;
  white-space: nowrap; font-family: var(--font);
}
.guide-print-btn:hover { border-color: var(--accent); color: var(--accent); }

/* --- Aim sections --- */
.guide-aim-section { margin-bottom: 52px; scroll-margin-top: 54px; }
.guide-aim-hd {
  display: flex; align-items: flex-start; gap: 12px;
  padding-bottom: 12px; border-bottom: 2px solid var(--accent);
  margin-bottom: 18px;
}
.guide-aim-badge {
  width: 44px; height: 44px; border-radius: var(--r-md);
  background: var(--accent); color: #f6fffc;
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 1.2rem; flex-shrink: 0;
}
.guide-aim-title { font-size: 1.1rem; font-weight: 700; line-height: 1.3; }
.guide-aim-subtitle { font-size: 0.81rem; color: var(--ink-2); margin-top: 3px; }

/* --- Topic collapsible --- */
.guide-topic { border: 1px solid var(--line); border-radius: var(--r-md); margin-bottom: 10px; overflow: hidden; }
.guide-topic-hd {
  display: flex; align-items: center; gap: 10px;
  padding: 11px 14px; background: var(--surface);
  cursor: pointer; user-select: none;
}
.guide-topic-hd:hover { background: color-mix(in srgb, var(--accent) 6%, var(--surface)); }
.guide-topic-code {
  font-size: 0.68rem; font-weight: 700; padding: 2px 6px;
  border-radius: 4px; background: var(--accent); color: #f6fffc;
  font-family: var(--mono); flex-shrink: 0;
}
.guide-topic-name { font-weight: 600; flex: 1; font-size: 0.9rem; }
.guide-topic-chevron { font-size: 0.65rem; color: var(--ink-2); transition: transform 0.2s; flex-shrink: 0; }
.guide-topic.open .guide-topic-chevron { transform: rotate(180deg); }
.guide-topic-body {
  padding: 16px 18px; border-top: 1px solid var(--line);
  display: none; line-height: 1.65; font-size: 0.87rem;
}
.guide-topic.open .guide-topic-body { display: block; }
.guide-topic-body p { margin: 0 0 10px; }
.guide-topic-body h4 { margin: 16px 0 6px; font-size: 0.9rem; }
.guide-topic-body ul, .guide-topic-body ol { margin: 6px 0 10px; padding-left: 20px; }
.guide-topic-body li { margin-bottom: 3px; }

/* --- Content boxes --- */
.def-box {
  background: rgba(59,130,246,0.08); border-left: 4px solid #3b82f6;
  padding: 10px 14px; border-radius: 0 var(--r-sm) var(--r-sm) 0; margin: 10px 0;
}
[data-theme="dark"] .def-box { background: rgba(59,130,246,0.13); }
.def-label {
  font-size: 0.67rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.08em; color: #3b82f6; margin-bottom: 3px;
}
.def-term { font-weight: 700; }
.exam-tip {
  background: rgba(245,158,11,0.1); border-left: 4px solid #f59e0b;
  padding: 10px 14px; border-radius: 0 var(--r-sm) var(--r-sm) 0; margin: 10px 0;
}
[data-theme="dark"] .exam-tip { background: rgba(245,158,11,0.13); }
.tip-label {
  font-size: 0.67rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.08em; color: #b45309; margin-bottom: 3px;
}
.mistake-box {
  background: rgba(239,68,68,0.08); border-left: 4px solid #ef4444;
  padding: 10px 14px; border-radius: 0 var(--r-sm) var(--r-sm) 0; margin: 10px 0;
}
[data-theme="dark"] .mistake-box { background: rgba(239,68,68,0.13); }
.mistake-label {
  font-size: 0.67rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.08em; color: #b91c1c; margin-bottom: 3px;
}
.formula-box {
  background: #1e293b; color: #e2e8f0; font-family: var(--mono);
  padding: 12px 16px; border-radius: var(--r-sm); margin: 10px 0;
  font-size: 0.81rem; overflow-x: auto; line-height: 1.75;
}
[data-theme="dark"] .formula-box { background: #0f172a; }

/* --- Tables --- */
.g-table { width: 100%; border-collapse: collapse; margin: 10px 0; font-size: 0.81rem; }
.g-table th {
  background: var(--surface); padding: 7px 9px; text-align: left;
  font-weight: 700; border: 1px solid var(--line);
}
.g-table td { padding: 6px 9px; border: 1px solid var(--line); vertical-align: top; }
.g-table tr:nth-child(even) td { background: color-mix(in srgb, var(--surface) 50%, var(--bg)); }

/* --- Mark as revised --- */
.guide-mark-btn {
  display: inline-flex; align-items: center; gap: 7px; margin-top: 18px;
  padding: 9px 16px; border: 2px solid var(--line); border-radius: var(--r-sm);
  background: transparent; cursor: pointer; font-size: 0.82rem; font-weight: 600;
  color: var(--ink-2); transition: all 0.15s; font-family: var(--font);
}
.guide-mark-btn:hover { border-color: #22c55e; color: #22c55e; }
.guide-mark-btn.revised { border-color: #22c55e; background: rgba(34,197,94,0.1); color: #16a34a; }
[data-theme="dark"] .guide-mark-btn.revised { background: rgba(34,197,94,0.15); color: #4ade80; }

/* --- Diagrams --- */
.guide-diagram { margin: 14px 0; text-align: center; }
.guide-diagram canvas { max-width: 100%; border-radius: var(--r-sm); }
.guide-diagram svg { max-width: 100%; height: auto; }
.guide-diagram figcaption { font-size: 0.74rem; color: var(--ink-2); margin-top: 5px; font-style: italic; }

/* --- Mobile sidebar toggle --- */
.guide-sb-toggle {
  display: none; width: 100%; padding: 11px 16px;
  background: var(--surface); border: none; border-bottom: 1px solid var(--line);
  text-align: left; font-weight: 600; font-size: 0.88rem; color: var(--ink);
  cursor: pointer; font-family: var(--font);
  align-items: center; justify-content: space-between; gap: 8px;
}

@media (max-width: 768px) {
  .guide-shell {
    flex-direction: column;
    width: 100%;
    overflow-x: hidden;
  }
  .guide-gallery { grid-template-columns: 1fr; }
  .guide-gallery-card { min-height: 156px; padding: 14px; }
  .guide-gallery-title { font-size: 0.98rem; }
  .guide-gallery-copy { font-size: 0.79rem; }
  .guide-sidebar {
    width: 100%; min-width: 0; height: auto;
    position: relative; border-right: none; border-bottom: 1px solid var(--line);
  }
  .guide-sb-toggle { display: flex; }
  .guide-toc-scroll { display: none; padding: 0 12px 10px; }
  .guide-sidebar.sb-open .guide-toc-scroll {
    display: block; max-height: 220px; overflow-y: auto;
  }
  .guide-main {
    width: 100%;
    padding: 0 12px 40px;
    overflow-x: hidden;
  }
  .guide-topbar {
    position: static;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
    padding: 8px 0;
  }
  .guide-progress-text {
    min-width: 0;
    width: 100%;
    text-align: left;
    font-size: 0.74rem;
  }
  .guide-print-btn {
    width: 100%;
    justify-content: center;
    padding: 8px 10px;
  }
  .guide-aim-hd {
    gap: 10px;
    margin-bottom: 12px;
    padding-bottom: 10px;
    flex-wrap: wrap;
  }
  .guide-aim-badge { width: 36px; height: 36px; font-size: 1rem; }
  .guide-aim-title { font-size: 1rem; }
  .guide-aim-subtitle { font-size: 0.8rem; }
  .guide-topic-hd {
    padding: 10px 11px;
    gap: 8px;
    flex-wrap: wrap;
    align-items: flex-start;
  }
  .guide-topic-code { font-size: 0.72rem; padding: 3px 7px; }
  .guide-topic-name { font-size: 0.9rem; min-width: 0; }
  .guide-topic-chevron { margin-left: auto; }
  .guide-topic-body {
    padding: 12px 12px;
    font-size: 0.87rem;
    line-height: 1.6;
    overflow-wrap: anywhere;
  }
  .guide-topic-body > * { max-width: 100%; }
  .guide-diagram { overflow-x: auto; }
  .g-table {
    display: block;
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    font-size: 0.78rem;
  }
  .g-table th, .g-table td { padding: 5px 6px; }
}

@media print {
  .guide-sidebar, .guide-topbar, .guide-mark-btn,
  .guide-sb-toggle, .tab-bar, header.topbar { display: none !important; }
  .guide-shell { display: block; }
  .guide-main { padding: 0; }
  #view-guide { padding: 0 !important; }
  .guide-topic-body { display: block !important; }
  .guide-topic-chevron { display: none; }
  .guide-aim-section { page-break-inside: avoid; }
  .formula-box { background: #f1f5f9 !important; color: #0f172a !important; }
}

/* Compact merged nav polish */
.topbar {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: nowrap;
  padding: 8px 12px;
}

.unit-brand {
  order: 1;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--ink);
  flex-shrink: 0;
}

.unit-brand img {
  width: 28px;
  height: 28px;
  border-radius: var(--r-sm);
  object-fit: cover;
  display: block;
}

.unit-brand span {
  font-size: clamp(1.125rem, 1rem + .75vw, 1.5rem);
  line-height: 1;
  font-family: 'Instrument Serif', Georgia, serif;
  font-weight: 400;
  letter-spacing: -0.01em;
}

.site-unit-nav {
  order: 2;
  flex: 0 0 auto;
  gap: 6px;
  align-items: center;
  flex-wrap: nowrap;
}

.site-unit-link {
  border: 1px solid var(--line-2);
  background: transparent;
  border-radius: var(--r-sm);
  padding: 6px 11px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: none;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
}

.site-unit-link:hover {
  background: var(--accent-2);
  border-color: var(--accent);
  color: var(--accent-ink);
}

.unit-avatar-btn {
  order: 5;
  width: 36px;
  height: 36px;
  padding: 0;
  appearance: none;
  border-radius: 999px;
  border: 1px solid var(--line-2);
  background: var(--surface);
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  font-size: 12px;
  font-weight: 800;
  flex-shrink: 0;
}

.unit-avatar-btn img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  border-radius: inherit;
  display: block;
}

.unit-avatar-btn:hover {
  border-color: var(--accent);
}

.topbar .tabs {
  order: 3;
  flex: 0 1 auto;
  min-width: auto;
  flex-wrap: nowrap;
  overflow-x: auto;
  gap: 6px;
  margin: 0;
}

.topbar .tab {
  border: 1px solid var(--line-2);
  background: transparent;
  border-radius: var(--r-sm);
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 700;
  white-space: nowrap;
}

.topbar .tab.active {
  background: var(--accent-2);
  color: var(--accent-ink);
  border-color: var(--accent);
  box-shadow: none;
}

#unit1-credit-chip {
  order: 4;
  position: static !important;
  transform: none !important;
  margin: 0;
}

@media (max-width: 768px) {
  .topbar {
    gap: 6px;
    padding: 8px 10px;
    flex-wrap: wrap;
  }

  .unit-avatar-btn {
    order: 2;
    width: 32px;
    height: 32px;
    font-size: 11px;
  }

  .unit-brand {
    order: 1;
  }

  #unit1-credit-chip {
    order: 5;
    margin-left: auto;
    width: auto;
  }

  .site-unit-nav {
    order: 3;
    width: 100%;
    max-width: 100%;
    overflow-x: auto;
    flex-wrap: nowrap;
    gap: 6px;
    padding-bottom: 0;
  }

  .site-unit-link {
    font-size: 11px;
    padding: 5px 10px;
  }

  .topbar .tabs {
    order: 4;
    width: 100%;
    overflow-x: auto;
    flex-wrap: nowrap;
    gap: 6px;
    justify-content: flex-start;
    padding-bottom: 0;
  }

  .topbar .tab {
    font-size: 11px;
    padding: 5px 10px;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .topbar {
    flex-wrap: wrap;
    gap: 8px;
    padding: 8px 12px;
    align-items: flex-start;
  }

  .unit-brand {
    flex-shrink: 0;
  }

  .site-unit-nav {
    width: auto;
    flex: 0 1 auto;
    min-width: 0;
    overflow-x: auto;
    white-space: nowrap;
    flex-wrap: nowrap;
    padding-bottom: 2px;
    scrollbar-width: none;
  }

  .site-unit-nav::-webkit-scrollbar,
  .topbar .tabs::-webkit-scrollbar {
    display: none;
  }

  .topbar .tabs {
    order: 6;
    width: 100%;
    flex: 1 0 100%;
    min-width: 100%;
    display: flex;
    flex-direction: row;
    overflow-x: auto;
    overflow-y: hidden;
    flex-wrap: nowrap;
    justify-content: flex-start;
    align-items: center;
    padding-bottom: 2px;
    scrollbar-width: none;
  }

  .topbar .tab {
    flex: 0 0 auto;
    white-space: nowrap;
  }

  #unit1-credit-chip {
    margin-left: 0;
    flex-shrink: 0;
  }

  .unit-avatar-btn {
    flex-shrink: 0;
  }
}

/* ============================================================
   Dashboard Grid Layout
   ============================================================ */
.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-bottom: 32px;
}

.feature-section {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 24px;
  box-shadow: 0 2px 8px rgba(20,32,30,.04);
  transition: all .2s ease;
}

.feature-section:hover {
  border-color: var(--line-2);
  box-shadow: 0 4px 16px rgba(20,32,30,.06);
}

.feature-header {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--accent-2);
}

@media (max-width: 768px) {
  .site-unit-nav {
    display: none !important;
  }
}

.feature-icon {
  font-size: 32px;
  line-height: 1;
  flex-shrink: 0;
}

.feature-header h3 {
  margin: 0 0 4px;
  font-size: 18px;
  font-weight: 900;
  letter-spacing: -0.01em;
}

.feature-header p {
  margin: 0;
  font-size: 13px;
  color: var(--ink-2);
}

@media (min-width: 641px) and (max-width: 1024px) {
  .topbar {
    flex-wrap: wrap !important;
    align-items: flex-start !important;
  }

  .topbar .tabs {
    order: 20 !important;
    width: 100% !important;
    min-width: 100% !important;
    flex: 1 0 100% !important;
    display: flex !important;
    flex-direction: row !important;
    flex-wrap: nowrap !important;
    align-items: center !important;
    justify-content: flex-start !important;
    overflow-x: auto !important;
    overflow-y: hidden !important;
  }

  .topbar .tab {
    flex: 0 0 auto !important;
    white-space: nowrap !important;
  }
}

.feature-cards {
  margin-bottom: 0;
}

.feature-cards .card h4 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
}

.feature-cards .card p {
  font-size: 13px;
}

@media (max-width: 1000px) {
  .feature-section {
    padding: 20px;
  }
}

/* Dense + playful layout for Questions and Revise pages */
#view-questions .dashboard-grid,
#view-revise .dashboard-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 16px;
  align-items: stretch;
}

#view-questions .feature-section,
#view-revise .feature-section {
  position: relative;
  overflow: hidden;
  padding: 16px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: linear-gradient(150deg, var(--surface) 0%, var(--bg) 100%);
  box-shadow: 0 2px 10px rgba(20,32,30,.05);
}

#view-questions .feature-section::before,
#view-revise .feature-section::before {
  content: "";
  position: absolute;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  pointer-events: none;
  opacity: 0.6;
}

#view-questions .feature-section:nth-child(1)::before,
#view-revise .feature-section:nth-child(1)::before {
  top: -70px;
  right: -55px;
  background: radial-gradient(circle, var(--accent-2) 0%, transparent 70%);
}

#view-questions .feature-section:nth-child(2)::before,
#view-revise .feature-section:nth-child(2)::before {
  bottom: -80px;
  right: -40px;
  background: radial-gradient(circle, var(--accent-2) 0%, transparent 72%);
}

#view-questions .feature-section:nth-child(3)::before,
#view-revise .feature-section:nth-child(3)::before {
  top: -75px;
  left: -45px;
  background: radial-gradient(circle, var(--accent-2) 0%, transparent 74%);
}

#view-questions .feature-header,
#view-revise .feature-header,
#view-questions .feature-cards,
#view-revise .feature-cards {
  position: relative;
  z-index: 1;
}

#view-questions .feature-header,
#view-revise .feature-header {
  gap: 12px;
  margin-bottom: 10px;
  padding-bottom: 10px;
  min-height: 94px;
  align-items: flex-start;
}

#view-questions .feature-header p,
#view-revise .feature-header p {
  min-height: 3.1em;
}

#view-questions .feature-icon,
#view-revise .feature-icon {
  font-size: 28px;
}

#view-questions .feature-cards .card,
#view-revise .feature-cards .card {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 14px;
  border-radius: 10px;
  background: linear-gradient(165deg, var(--surface) 0%, var(--bg) 100%);
}

#view-questions .feature-cards .card p,
#view-revise .feature-cards .card p {
  margin-bottom: 10px;
}

#view-questions .feature-cards .card .btn[data-goto]:not([data-goto="spec"]),
#view-revise .feature-cards .card .btn[data-goto]:not([data-goto="spec"]) {
  margin-top: auto;
  align-self: flex-start;
  min-width: 108px;
  justify-content: center;
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

#view-questions .feature-cards .card .btn[data-goto]:not([data-goto="spec"]):hover,
#view-revise .feature-cards .card .btn[data-goto]:not([data-goto="spec"]):hover {
  background: var(--accent-ink);
  border-color: var(--accent-ink);
}

#view-questions .card-cost-note,
#view-revise .card-cost-note {
  margin: 8px 0 0;
  font-size: 12px;
  color: var(--muted);
  line-height: 1.35;
}

#view-revise .feature-cards .card .card-action-row {
  margin-top: auto;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

#view-revise .feature-cards .card .card-action-row .btn {
  margin-top: 0;
}

#view-revise .feature-cards .card .btn-spec-mini {
  min-width: 0;
  padding: 7px 10px;
  font-size: 12px;
  font-weight: 700;
  background: var(--surface);
  color: var(--accent);
  border-color: var(--accent-2);
}

#view-revise .feature-cards .card .btn + .btn {
  margin-left: 8px;
  margin-top: 8px;
}

@media (max-width: 1150px) {
  #view-questions .dashboard-grid,
  #view-revise .dashboard-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 700px) {
  #view-questions .dashboard-grid,
  #view-revise .dashboard-grid {
    grid-template-columns: 1fr;
  }

  #view-questions .feature-header,
  #view-revise .feature-header {
    min-height: 0;
  }

  #view-questions .feature-header p,
  #view-revise .feature-header p {
    min-height: 0;
  }

  #view-questions .feature-section,
  #view-revise .feature-section {
    padding: 14px;
  }

  #view-questions .feature-cards .card,
  #view-revise .feature-cards .card {
    padding: 12px;
  }
}