/* ════════════════════════════════════════════════════════════
   BTEC IT Unit 3 — Website Development — App styles
   Clean, modern, exam-revision aesthetic.
   ════════════════════════════════════════════════════════════ */

:root {
  --bg: #faf6f7;
  --surface: #ffffff;
  --surface-2: #f5eef0;
  --ink: #211a1c;
  --ink-2: #594750;
  --ink-3: #a28f97;
  --line: #e8dfe2;
  --line-2: #d8c9ce;
  --accent: #d92d20;      /* primary red */
  --accent-ink: #8f1d14;
  --accent-2: #fed7d3;
  --accent-3: #ffece9;
  --part1: #0f766e;       /* teal for Part 1 */
  --part1-2: #ccf2ee;
  --part2: #c2410c;       /* orange for Part 2 */
  --part2-2: #ffead9;
  --ok: #12805c;
  --ok-2: #d9f5ea;
  --warn: #b54708;
  --warn-2: #ffedd5;
  --bad: #d92d20;
  --bad-2: #fee4e2;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .05), 0 1px 3px rgba(16, 24, 40, .08);
  --shadow-lg: 0 12px 32px rgba(16, 24, 40, .14);
  --font: 'Satoshi', 'Plus Jakarta Sans', 'Segoe UI', system-ui, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, 'Cascadia Code', monospace;
}

[data-theme="dark"] {
  --bg: #130e10;
  --surface: #1c1417;
  --surface-2: #261b1f;
  --ink: #f6eef0;
  --ink-2: #c4b2b9;
  --ink-3: #8a737c;
  --line: #332429;
  --line-2: #463035;
  --accent: #ff6b61;
  --accent-ink: #ffb4ad;
  --accent-2: #4a211d;
  --accent-3: #34161a;
  --part1: #2dd4bf;
  --part1-2: #123d38;
  --part2: #fb923c;
  --part2-2: #43240f;
  --ok: #34d399;
  --ok-2: #0e3a2c;
  --warn: #fb923c;
  --warn-2: #3d240a;
  --bad: #ff6b61;
  --bad-2: #40130f;
  --shadow: 0 1px 2px rgba(0, 0, 0, .4);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, .5);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 15.5px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Buttons don't inherit text colour by default (browsers use black).
   This keeps every button readable in dark mode unless a rule overrides it. */
button, input, select, textarea { font-family: inherit; }
button { color: inherit; }

.wrap { max-width: 1180px; margin: 0 auto; padding: 22px 20px 60px; }

h1, h2, h3, h4 { line-height: 1.25; margin: 0 0 .5em; font-weight: 800; }
h1 { font-size: clamp(1.7rem, 3.4vw, 2.5rem); }
h2 { font-size: clamp(1.3rem, 2.4vw, 1.7rem); }
h3 { font-size: 1.12rem; }
p { margin: 0 0 .9em; }
a { color: var(--accent); }
.muted, .muted * { color: var(--ink-2); }
.small { font-size: .85rem; }
img { max-width: 100%; }

.eyebrow {
  font-size: .74rem;
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--part1);
  margin: 0 0 8px;
}

/* ── Top bar ─────────────────────────────────────────────── */
.topbar {
  position: sticky; top: 0; z-index: 900;
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  padding: 8px 18px;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}
.unit-brand { display: flex; align-items: center; gap: 8px; text-decoration: none; color: var(--ink); font-weight: 900; }
.unit-brand img { width: 28px; height: 28px; border-radius: 8px; }
.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;
}

.tabs { display: flex; align-items: center; gap: 4px; flex-wrap: wrap; padding: 4px 0; }
.tab {
  appearance: none; border: 1px solid transparent; border-radius: 999px;
  background: transparent; color: var(--ink-2);
  font: inherit; font-weight: 700; font-size: .86rem;
  padding: 7px 13px; cursor: pointer;
  transition: background .15s, color .15s, border-color .15s;
}
.tab:hover { background: var(--surface-2); color: var(--ink); }
.tab.active { background: var(--accent); color: #fff; }
.tab.tab-part1 { color: var(--part1); }
.tab.tab-part1.active { background: var(--part1); color: #fff; }
.tab.tab-part2 { color: var(--part2); }
.tab.tab-part2.active { background: var(--part2); color: #fff; }
.tab.tab-special { background: var(--accent-3); border-color: var(--line-2); color: var(--accent-ink); }
.tab.tab-special:hover { background: var(--accent-2); border-color: var(--accent); }
.tab.tab-special.active { background: var(--accent-2); border-color: var(--accent); color: var(--accent-ink); }
[data-theme="dark"] .tab.tab-special { background: var(--accent-3); border-color: var(--line-2); color: var(--accent-ink); }
[data-theme="dark"] .tab.tab-special:hover { background: var(--accent-2); border-color: var(--accent); }
[data-theme="dark"] .tab.tab-special.active { background: var(--accent-2); border-color: var(--accent); color: var(--accent-ink); }

.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: 10px;
  border: 1px solid var(--line-2); background: var(--surface); color: var(--ink-2);
  cursor: pointer;
}
.icon-btn:hover { color: var(--ink); background: var(--surface-2); }
.unit-avatar-btn {
  width: 36px; height: 36px; border-radius: 50%;
  border: 1px solid var(--line-2); background: var(--accent-3); color: var(--accent-ink);
  font-weight: 800; cursor: pointer; overflow: hidden; padding: 0;
  display: inline-flex; align-items: center; justify-content: center;
}
.unit-avatar-btn img { width: 100%; height: 100%; object-fit: cover; }

/* ── Topbar parity with the other unit apps (Unit 1/2) ─── */
.topbar { display: flex; align-items: center; gap: 12px; flex-wrap: nowrap; padding: 8px 12px; }
.site-unit-nav { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.site-unit-link {
  text-decoration: none; font-size: 12px; font-weight: 700;
  border: 1px solid var(--line-2); color: var(--ink-2);
  background: var(--surface); border-radius: 999px; padding: 6px 11px;
  display: inline-flex; align-items: center; gap: 6px; white-space: nowrap;
}
.site-unit-link svg.nu { width: 13px; height: 13px; flex: 0 0 13px; }
.site-unit-link:hover { border-color: var(--accent); color: var(--accent-ink); background: var(--accent-2); }
.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: 8px; 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; margin-left: auto; }
.unit-avatar-btn:hover { border-color: var(--accent); }
.unit-avatar-btn img { width: 100%; height: 100%; object-fit: cover; object-position: center; border-radius: inherit; display: block; }

/* Desktop header: keep the course navigation and study tabs on deliberate rows. */
@media (min-width: 841px) {
  .topbar {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto auto;
    grid-template-areas:
      "brand site credit actions"
      "tabs tabs tabs tabs";
    align-items: center;
    column-gap: 10px;
    row-gap: 8px;
    padding: 9px 16px;
  }
  .topbar .unit-brand { grid-area: brand; }
  .topbar .site-unit-nav { grid-area: site; min-width: 0; }
  .topbar .tabs {
    grid-area: tabs;
    width: 100%;
    min-width: 0;
    overflow-x: auto;
    flex-wrap: nowrap !important;
    white-space: nowrap;
    padding-top: 2px;
    justify-content: center;
  }
  .topbar .tabs .tab { flex: 0 0 auto; white-space: nowrap; }
  .topbar #unit1-credit-chip {
    grid-area: credit;
    width: max-content;
    max-width: 260px;
    min-width: 0;
    overflow: hidden;
    margin-left: 0;
  }
  .topbar > div:last-child {
    grid-area: actions;
    display: flex !important;
    align-items: center;
    justify-content: flex-end;
    gap: 8px;
  }
  body.ra10-refresh-enabled .topbar .tabs { width: 100% !important; max-width: none !important; flex-wrap: nowrap !important; }
}

/* ── Buttons ─────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  border: 1px solid var(--line-2); border-radius: 10px;
  background: var(--surface); color: var(--ink);
  font: inherit; font-weight: 700; font-size: .9rem;
  padding: 9px 16px; cursor: pointer; text-decoration: none;
  transition: transform .12s, box-shadow .12s, background .15s;
}
.btn:hover { background: var(--surface-2); box-shadow: var(--shadow); }
.btn:active { transform: translateY(1px); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent-ink); box-shadow: 0 4px 14px rgba(15, 98, 254, .35); }
.btn.ghost { background: transparent; }
.btn.big { padding: 12px 22px; font-size: .98rem; }
.btn:disabled { opacity: .5; cursor: not-allowed; transform: none; }
.btn-part1 { background: var(--part1); border-color: var(--part1); color: #fff; }
.btn-part2 { background: var(--part2); border-color: var(--part2); color: #fff; }
.card-action-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }

/* ── Views ───────────────────────────────────────────────── */
.view { display: none; }
.view.active { display: block; animation: fadeIn .18s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

.section-head { margin: 4px 0 18px; }
.section-head h2 { margin-bottom: 4px; }
.section-head p { color: var(--ink-2); max-width: 760px; }

/* ── Dashboard Grid (Revise & Creation Tools menus — matches unit 1/2) ── */
.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(--radius);
  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); }
.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); }
.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; }
.grid-1 { display: grid; grid-template-columns: 1fr; gap: 16px; }
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-sm);
  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; }

/* Dense + playful layout for the Revise and Creation Tools menus */
#view-revise .dashboard-grid,
#view-tools .dashboard-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; margin-bottom: 16px; align-items: stretch;
}
#view-revise .feature-section,
#view-tools .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-revise .feature-cards .card .card-action-row,
#view-tools .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,
#view-tools .feature-cards .card .card-action-row .btn { margin-top: 0; }
#view-revise .feature-cards .card .btn-spec-mini,
#view-tools .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);
}
.revise-focus-btn { padding: 8px 14px; font-size: .86rem; }
@media (max-width: 1150px) {
  #view-revise .dashboard-grid, #view-tools .dashboard-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 700px) {
  #view-revise .dashboard-grid, #view-tools .dashboard-grid { grid-template-columns: 1fr; }
  .feature-section { padding: 20px; }
}

/* Desktop-only tool notice (shown on phones) — centered popup */
.mobile-tool-notice-overlay {
  position: fixed; inset: 0; z-index: 1000;
  background: rgba(0, 0, 0, .5);
  display: flex; align-items: center; justify-content: center; padding: 20px;
}
.mobile-tool-notice {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  background: var(--surface); border: 1px solid var(--line-2); border-radius: var(--radius);
  padding: 20px 22px; box-shadow: var(--shadow-lg); max-width: 420px; width: 100%;
}
.mobile-tool-notice-ico { font-size: 2rem; line-height: 1; flex-shrink: 0; }
.mobile-tool-notice-body { flex: 1; min-width: 200px; }
.mobile-tool-notice-body b { display: block; font-size: .98rem; margin-bottom: 3px; }
.mobile-tool-notice-body p { margin: 0; font-size: .84rem; color: var(--ink-2); line-height: 1.5; }
.mobile-tool-notice-actions { display: flex; gap: 8px; width: 100%; margin-top: 4px; }
.mobile-tool-notice-actions .btn { flex: 1; }

.section-block {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px; margin: 18px 0; box-shadow: var(--shadow);
}
.section-block-head .sb-eyebrow {
  font-size: .72rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; color: var(--accent);
}
.section-block-head h3 { margin: 4px 0; }

/* ── Home hero & part cards ───────────────────────────────── */
.part-hero {
  position: relative; overflow: hidden;
  border-radius: 20px; padding: 34px 32px; margin-bottom: 22px;
  color: #fff;
  background: linear-gradient(128deg, #101828 0%, #1b2a4a 55%, #0f766e 130%);
}
.part-hero .eyebrow { color: #9ecbff; }
.part-hero h1 { color: #fff; margin: 2px 0 10px; }
.part-hero .lede { color: rgba(255, 255, 255, .85); max-width: 720px; font-size: 1.06rem; }
.hero-cta-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 18px; }
.part-hero .btn { border: none; }
.part-hero .btn:not(.primary) { background: rgba(255, 255, 255, .14); color: #fff; }
.part-hero .btn:not(.primary):hover { background: rgba(255, 255, 255, .24); }

.part-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin: 0 0 20px; }
@media (max-width: 860px) { .part-grid { grid-template-columns: 1fr; } }

.part-card {
  display: flex; flex-direction: column;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; box-shadow: var(--shadow);
  border-top: 4px solid var(--part1);
}
.part-card-assignment { border-top-color: var(--part2); }
.part-card-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.part-badge {
  font-size: .74rem; font-weight: 900; letter-spacing: .08em; text-transform: uppercase;
  color: var(--part1); background: var(--part1-2);
  padding: 3px 10px; border-radius: 999px;
}
.part-card-assignment .part-badge { color: var(--part2); background: var(--part2-2); }
.part-free-badge { font-size: .76rem; font-weight: 700; color: var(--ink-3); }
.part-feature-list { margin: 6px 0 16px; padding-left: 18px; color: var(--ink-2); }
.part-feature-list li { margin-bottom: 7px; }
.part-feature-list strong { color: var(--ink); }
.part-card-actions { margin-top: auto; display: flex; flex-wrap: wrap; gap: 8px; }

/* ── Aim grid (home) ──────────────────────────────────────── */
.aim-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 12px; }
.aim-card {
  display: block; width: 100%; text-align: left;
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  background: var(--surface-2); color: var(--ink);
  padding: 14px; cursor: pointer; font: inherit;
  transition: border-color .15s, box-shadow .15s, transform .12s;
}
.aim-card:hover { border-color: var(--accent); box-shadow: var(--shadow); transform: translateY(-1px); }
.aim-card .ac-badge {
  display: inline-block; min-width: 34px; text-align: center;
  background: var(--accent); color: #fff; font-weight: 900; border-radius: 8px;
  padding: 3px 8px; margin-bottom: 8px; font-size: .9rem;
}
.aim-card .ac-title { font-weight: 800; display: block; margin-bottom: 4px; }
.aim-card .ac-sub { font-size: .82rem; color: var(--ink-2); }
.aim-card .ac-steps { display: block; margin-top: 8px; font-size: .78rem; font-weight: 700; color: var(--accent-ink); }

/* ── Revise picker ────────────────────────────────────────── */
.revise-pick { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 12px; margin-bottom: 18px; }
.revise-pick-card {
  display: flex; flex-direction: column; align-items: flex-start; gap: 6px; text-align: left;
  border: 1.5px solid var(--line); border-radius: var(--radius);
  background: var(--surface); color: var(--ink); padding: 16px; cursor: pointer; font: inherit;
  transition: border-color .15s, box-shadow .15s;
}
.revise-pick-card:hover { box-shadow: var(--shadow); }
.revise-pick-card.active { border-color: var(--accent); background: var(--accent-3); }
.revise-pick-card .rp-icon { font-size: 1.4rem; }
.revise-pick-card .muted { font-size: .82rem; }

#revise-controls { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-bottom: 16px; }
#revise-controls select, .select {
  border: 1px solid var(--line-2); border-radius: 9px; background: var(--surface); color: var(--ink);
  font: inherit; font-size: .9rem; padding: 8px 10px;
}
#revise-controls .muted { margin-left: 4px; }

.mc-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px; margin-bottom: 14px; box-shadow: var(--shadow);
}
.mc-meta { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 10px; }
.chip {
  font-size: .74rem; font-weight: 800; letter-spacing: .04em;
  background: var(--surface-2); color: var(--ink-2);
  padding: 2px 9px; border-radius: 999px;
}
.chip.aim-A { background: var(--part1-2); color: var(--part1); }
.chip.aim-B { background: var(--accent-2); color: var(--accent-ink); }
.chip.aim-C { background: var(--part2-2); color: var(--part2); }
.mc-q { font-weight: 700; font-size: 1.03rem; margin-bottom: 12px; }
.mc-opts { display: grid; gap: 8px; }
.mc-opt {
  display: flex; align-items: flex-start; gap: 10px; text-align: left;
  border: 1.5px solid var(--line); border-radius: 10px; background: var(--surface);
  color: var(--ink); padding: 11px 13px; cursor: pointer; font: inherit;
  transition: border-color .12s, background .12s;
}
.mc-opt:hover { border-color: var(--accent); background: var(--accent-3); }
.mc-opt .opt-letter {
  flex: 0 0 26px; height: 26px; display: inline-flex; align-items: center; justify-content: center;
  border-radius: 7px; background: var(--surface-2); font-weight: 800; font-size: .8rem;
}
.mc-opt.selected { border-color: var(--accent); background: var(--accent-3); }
.mc-opt.selected .opt-letter { background: var(--accent); color: #fff; }
.mc-opt.correct { border-color: var(--ok); background: var(--ok-2); }
.mc-opt.correct .opt-letter { background: var(--ok); color: #fff; }
.mc-opt.wrong { border-color: var(--bad); background: var(--bad-2); }
.mc-opt.wrong .opt-letter { background: var(--bad); color: #fff; }
.mc-expl {
  margin-top: 12px; padding: 12px 14px; border-radius: 10px;
  background: var(--surface-2); font-size: .92rem; border-left: 3px solid var(--accent);
}
.mc-expl.ok { border-left-color: var(--ok); }
.mc-expl.no { border-left-color: var(--bad); }

/* ── Quiz ─────────────────────────────────────────────────── */
.quiz-stage { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); }
.quiz-progress-bar { height: 8px; border-radius: 999px; background: var(--surface-2); overflow: hidden; margin-bottom: 16px; }
.quiz-progress-bar span { display: block; height: 100%; background: linear-gradient(90deg, var(--accent), #7fb0ff); border-radius: inherit; transition: width .3s; }
.quiz-results { text-align: center; padding: 30px 10px; }
.quiz-score-big { font-size: 2.6rem; font-weight: 900; color: var(--accent); }

/* ── Flashcards ───────────────────────────────────────────── */
.flash-stage { display: flex; flex-direction: column; align-items: center; padding: 10px 0; }
.flash-card {
  width: 100%; max-width: 560px; min-height: 220px; perspective: 1000px; cursor: pointer;
  margin-bottom: 18px;
}
.flash-inner {
  position: relative; width: 100%; min-height: 220px;
  transform-style: preserve-3d; transition: transform .5s;
}
.flash-card.flipped .flash-inner { transform: rotateY(180deg); }
.flash-face {
  position: absolute; inset: 0; backface-visibility: hidden; -webkit-backface-visibility: hidden;
  border-radius: 16px; border: 1px solid var(--line);
  display: flex; align-items: center; justify-content: center; text-align: center;
  padding: 26px; font-size: 1.12rem; font-weight: 700; box-shadow: var(--shadow);
}
.flash-front { background: var(--accent); color: #fff; }
.flash-back { background: var(--surface); transform: rotateY(180deg); color: var(--ink); font-weight: 500; font-size: .95rem; }
.flash-actions { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; }
.flash-count { font-weight: 700; color: var(--ink-2); margin-bottom: 10px; }

/* ── Guide ────────────────────────────────────────────────── */
.guide-shell { display: grid; grid-template-columns: 250px 1fr; gap: 20px; align-items: start; }
@media (max-width: 900px) { .guide-shell { grid-template-columns: 1fr; } }
.guide-sidebar {
  position: sticky; top: 76px;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  max-height: calc(100vh - 100px); overflow: hidden; display: flex; flex-direction: column;
  box-shadow: var(--shadow);
}
@media (max-width: 900px) { .guide-sidebar { position: static; max-height: none; } }
.guide-sidebar-hd { padding: 12px 14px; border-bottom: 1px solid var(--line); }
.guide-toc-label { font-size: .74rem; font-weight: 900; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); }
.guide-toc-scroll { overflow-y: auto; padding: 8px; }
.guide-toc-aim-group { margin-bottom: 6px; }
.guide-toc-aim-link {
  display: flex; align-items: center; gap: 8px; width: 100%; text-align: left;
  border: none; background: transparent; color: var(--ink); font: inherit; font-weight: 800; font-size: .86rem;
  padding: 8px 10px; border-radius: 8px; cursor: pointer;
}
.guide-toc-aim-link:hover { background: var(--surface-2); }
.guide-toc-aim-link.active { background: var(--accent-3); color: var(--accent-ink); }
.guide-toc-badge {
  min-width: 24px; text-align: center; font-size: .78rem; font-weight: 900;
  background: var(--accent); color: #fff; border-radius: 7px; padding: 2px 7px;
}
.guide-toc-topic-links { margin: 2px 0 6px 16px; display: flex; flex-direction: column; gap: 1px; }
.guide-toc-topic-link {
  border: none; background: transparent; color: var(--ink-2); font: inherit; font-size: .8rem;
  text-align: left; padding: 5px 10px; border-radius: 7px; cursor: pointer;
}
.guide-toc-topic-link:hover { background: var(--surface-2); color: var(--ink); }

.guide-main { min-width: 0; }
.guide-topbar { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.guide-progress-track { flex: 1; height: 8px; border-radius: 999px; background: var(--surface-2); overflow: hidden; }
.guide-progress-fill { height: 100%; background: linear-gradient(90deg, var(--part1), var(--accent)); border-radius: inherit; transition: width .3s; }
.guide-progress-text { font-size: .82rem; font-weight: 700; color: var(--ink-2); white-space: nowrap; }
.guide-print-btn { border: 1px solid var(--line-2); border-radius: 9px; background: var(--surface); padding: 7px 12px; cursor: pointer; font: inherit; font-size: .82rem; font-weight: 700; }
.guide-print-btn:hover { background: var(--surface-2); }

.guide-aim-section { margin-bottom: 22px; }
.guide-aim-hd {
  display: flex; align-items: center; gap: 12px;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 14px 16px; margin-bottom: 10px; box-shadow: var(--shadow);
}
.guide-aim-badge {
  flex: 0 0 42px; height: 42px; display: inline-flex; align-items: center; justify-content: center;
  border-radius: 12px; background: var(--accent); color: #fff; font-weight: 900; font-size: 1.1rem;
}
.guide-aim-title { font-weight: 800; }
.guide-aim-subtitle { font-size: .84rem; color: var(--ink-2); }

.guide-topic {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-sm);
  margin-bottom: 10px; overflow: hidden;
}
.guide-topic-hd {
  display: flex; align-items: center; gap: 10px; padding: 13px 16px; cursor: pointer; user-select: none;
  font-weight: 800; font-size: .95rem;
}
.guide-topic-hd:hover { background: var(--surface-2); }
.guide-topic-code {
  font-size: .74rem; font-weight: 900; letter-spacing: .06em;
  background: var(--accent-2); color: var(--accent-ink);
  padding: 2px 8px; border-radius: 7px;
}
.guide-topic-chevron { margin-left: auto; color: var(--ink-3); transition: transform .2s; }
.guide-topic.open .guide-topic-chevron { transform: rotate(180deg); }
.guide-topic-body { display: none; padding: 4px 18px 18px; }
.guide-topic.open .guide-topic-body { display: block; }

.guide-mark-btn {
  display: inline-flex; align-items: center; gap: 8px;
  border: 1.5px dashed var(--line-2); border-radius: 10px; background: transparent;
  color: var(--ink-2); font: inherit; font-weight: 700; font-size: .86rem;
  padding: 8px 14px; cursor: pointer; margin-top: 4px;
}
.guide-mark-btn:hover { border-color: var(--ok); color: var(--ok); }
.guide-mark-btn.revised { border: 1.5px solid var(--ok); background: var(--ok-2); color: var(--ok); }
.guide-mark-icon { font-size: 1rem; }

.def-box {
  background: var(--surface-2); border-left: 4px solid var(--accent);
  border-radius: 8px; padding: 12px 14px; margin: 12px 0;
}
.def-label { font-size: .72rem; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; color: var(--accent-ink); margin-bottom: 2px; }
.def-term { font-weight: 800; }

.exam-tip {
  background: var(--accent-3); border: 1px solid var(--accent-2); border-radius: 8px;
  padding: 12px 14px; margin: 12px 0;
}
.tip-label { font-size: .72rem; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; color: var(--accent-ink); margin-bottom: 2px; }
.mistake-box {
  background: var(--warn-2); border: 1px solid #fed7aa; border-radius: 8px; padding: 12px 14px; margin: 12px 0;
}
.mistake-label { font-size: .72rem; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; color: var(--warn); margin-bottom: 2px; }

.g-table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: .9rem; }
.g-table th {
  text-align: left; font-size: .78rem; letter-spacing: .05em; text-transform: uppercase;
  background: var(--surface-2); color: var(--ink-2); padding: 9px 10px;
  border-bottom: 2px solid var(--line-2);
}
.g-table td { padding: 9px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
.g-table tr:last-child td { border-bottom: none; }
.g-table tbody tr:hover { background: var(--surface-2); }

.guide-gallery { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; margin-bottom: 18px; }
.guide-gallery-card {
  position: relative; overflow: hidden; text-align: left;
  border: none; border-radius: var(--radius); color: #fff; cursor: pointer;
  padding: 18px; min-height: 150px; display: flex; flex-direction: column; justify-content: flex-end; gap: 4px;
  background: linear-gradient(160deg, rgba(16, 24, 40, .82), rgba(16, 24, 40, .45)), var(--guide-card-image, #33405d) center/cover;
  font: inherit;
}
.guide-gallery-kicker { font-size: .72rem; font-weight: 900; letter-spacing: .1em; text-transform: uppercase; opacity: .85; }
.guide-gallery-title { font-weight: 900; font-size: 1.02rem; }
.guide-gallery-copy { font-size: .82rem; opacity: .9; }
.guide-gallery-source { font-size: .68rem; opacity: .6; }

/* ── Wireframe tool (embedded draw.io) ───────────────────── */
.wf-embed { display: flex; flex-direction: column; gap: 10px; }
.wf-embed-hint {
  display: flex; gap: 10px; align-items: flex-start;
  background: var(--accent-3); border: 1px solid var(--accent-2); border-radius: 12px;
  padding: 12px 14px; font-size: .86rem; color: var(--ink-2); line-height: 1.5;
}
.wf-embed-hint-ico { font-size: 1.4rem; line-height: 1.2; }
.wf-embed-hint strong { color: var(--accent-ink); }
.wf-embed-hint-text { flex: 1; min-width: 0; }
.wf-open-btn {
  flex: 0 0 auto; white-space: nowrap; align-self: center;
  border: 1px solid var(--accent-2); background: var(--accent); color: #fff;
  font: inherit; font-size: .8rem; font-weight: 700; text-decoration: none;
  padding: 7px 12px; border-radius: 8px;
}
.wf-open-btn:hover { background: var(--accent-ink); }
.wf-iframe {
  width: 100%; height: 72vh; min-height: 520px;
  border: 1px solid var(--line); border-radius: 12px; background: #fff;
  box-shadow: var(--shadow);
}

/* ── Full-bleed tools (wireframe, code editor, AI Assigner) ──
   When one of these tools is open it fills the whole area below
   the top navigation bar, so learners get a real app experience. */
body.tool-full { display: flex; flex-direction: column; height: 100vh; overflow: hidden; }
body.tool-full .topbar { position: static; flex: 0 0 auto; }
body.tool-full .ra10-subject-banner { flex: 0 0 auto; }
body.tool-full main.wrap { flex: 1 1 auto; min-height: 0; max-width: none; margin: 0; padding: 0; overflow: hidden; }
body.tool-full footer.footer { display: none; }
body.tool-full .view.active { height: 100%; display: flex; flex-direction: column; }
body.tool-full .view.active .section-head { display: none; }

/* Wireframe fills below the hint bar */
body.tool-full #view-wireframe #wireframe-tool { flex: 1; min-height: 0; display: flex; }
body.tool-full .wf-embed { flex: 1; min-height: 0; width: 100%; gap: 0; }
body.tool-full .wf-embed-hint { flex: 0 0 auto; border-radius: 0; border-width: 0 0 1px 0; }
body.tool-full .wf-iframe { flex: 1; min-height: 0; height: auto; border: none; border-radius: 0; box-shadow: none; }

/* Code editor fills below its own toolbar */
body.tool-full #view-editor #ed-app { flex: 1; min-height: 0; }
body.tool-full .ed-app { display: flex; flex-direction: column; border: none; border-radius: 0; box-shadow: none; }
body.tool-full .ed-body { flex: 1; min-height: 0; }
body.tool-full .ed-panes { min-height: 0; }
body.tool-full .ed-topbar, body.tool-full .ed-status { border-radius: 0; }

/* AI Assigner fills the screen */
body.tool-full #view-ai #ai-assigner-panel { flex: 1; min-height: 0; display: flex; }
body.tool-full .ai-client { max-width: none; max-height: none; min-height: 0; height: 100%; width: 100%; margin: 0; border: none; border-radius: 0; box-shadow: none; }

/* ── Code Snippets ───────────────────────────────────────── */
.snip-layout { display: grid; grid-template-columns: 280px minmax(0, 1fr); gap: 16px; align-items: start; }
@media (max-width: 860px) { .snip-layout { grid-template-columns: 1fr; } }
.snip-list { display: flex; flex-direction: column; gap: 8px; position: sticky; top: 0; max-height: 80vh; overflow-y: auto; }
.snip-list-item {
  display: block; text-align: left; padding: 12px 14px; border: 1px solid var(--line);
  border-radius: 12px; background: var(--surface); cursor: pointer; font: inherit;
  transition: border-color .12s, background .12s;
}
.snip-list-item b { display: block; font-size: .88rem; margin-bottom: 3px; }
.snip-list-item small { font-size: .74rem; color: var(--ink-2); line-height: 1.35; display: block; }
.snip-list-item:hover { border-color: var(--line-2); }
.snip-list-item.active { border-color: var(--accent); background: var(--accent-3); }
.snip-detail { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; }
.snip-head { padding: 14px 18px; border-bottom: 1px solid var(--line); }
.snip-head h3 { margin: 0 0 4px; font-size: 1.05rem; }
.snip-head p { margin: 0; font-size: .84rem; color: var(--ink-2); }
.snip-tabs { display: flex; gap: 4px; padding: 8px 14px 0; }
.snip-tab { border: 1px solid var(--line-2); background: transparent; color: var(--ink-2); font: inherit; font-weight: 700; font-size: .8rem; padding: 6px 14px; border-radius: 999px; cursor: pointer; }
.snip-tab.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.snip-preview { padding: 14px; }
.snip-preview iframe { width: 100%; height: 480px; border: 1px solid var(--line); border-radius: 10px; background: #fff; }
.snip-code { padding: 14px; display: flex; flex-direction: column; gap: 14px; }
.snip-block { border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.snip-block-head { display: flex; justify-content: space-between; align-items: center; padding: 8px 14px; background: var(--surface-2); border-bottom: 1px solid var(--line); font-size: .8rem; font-weight: 800; }
.snip-copy { border: 1px solid var(--line-2); background: var(--surface); color: var(--ink); font: inherit; font-weight: 700; font-size: .76rem; padding: 5px 12px; border-radius: 999px; cursor: pointer; }
.snip-copy:hover { background: var(--accent-3); color: var(--accent-ink); }
.snip-block pre { margin: 0; padding: 14px; background: #0f1115; color: #d6e2f0; overflow-x: auto; font-family: var(--mono); font-size: .78rem; line-height: 1.5; }
.snip-block code { font-family: var(--mono); }

/* ── Wireframe tool (wireframe.cc style) ─────────────────── */
.wf-toolbar {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  padding: 8px 12px; margin-bottom: 10px;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
}
.wf-toolbar .wf-brand { font-weight: 900; color: var(--accent); font-size: .9rem; margin-right: 4px; }
.wf-btn {
  border: 1px solid var(--line-2); border-radius: 7px; background: var(--surface);
  color: var(--ink-2); font: inherit; font-size: .78rem; font-weight: 700;
  padding: 5px 10px; cursor: pointer; white-space: nowrap;
  transition: border-color .12s, color .12s, background .12s;
}
.wf-btn:hover { border-color: var(--accent); color: var(--accent-ink); background: var(--accent-3); }
.wf-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.wf-btn.danger:hover { border-color: var(--bad); color: var(--bad); background: var(--bad-2); }
.wf-label { font-size: .68rem; font-weight: 800; text-transform: uppercase; letter-spacing: .06em; color: var(--ink-3); }
.wf-select {
  border: 1px solid var(--line-2); border-radius: 7px; background: var(--surface);
  color: var(--ink); font: inherit; font-size: .78rem; font-weight: 700; padding: 4px 8px;
}
.wf-num { width: 82px; border: 1px solid var(--line-2); border-radius: 7px; background: var(--surface); color: var(--ink); font: inherit; font-size: .78rem; font-weight: 700; padding: 4px 8px; }
.wf-x { color: var(--ink-3); font-weight: 700; }
.wf-spacer { flex: 1; }

.wf-body { display: grid; grid-template-columns: 220px minmax(0, 1fr) 230px; gap: 12px; align-items: start; }
@media (max-width: 1100px) { .wf-body { grid-template-columns: 200px minmax(0, 1fr); } }
@media (max-width: 760px) { .wf-body { grid-template-columns: 1fr; } }

.wf-stencil { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-sm); box-shadow: var(--shadow); overflow: hidden; }
.wf-stencil-hd { padding: 9px 12px; font-size: .7rem; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); background: var(--surface-2); border-bottom: 1px solid var(--line); }
.wf-stencil-hd:not(:first-child) { border-top: 1px solid var(--line); }
.wf-stencil-list { display: grid; grid-template-columns: 1fr 1fr; gap: 4px; padding: 8px; }
.wf-stencil-btn { display: flex; flex-direction: column; align-items: center; gap: 4px; border: 1px solid var(--line-2); border-radius: 8px; background: var(--surface); color: var(--ink-2); padding: 7px 4px; cursor: pointer; font: inherit; font-size: .68rem; font-weight: 700; transition: border-color .12s, color .12s, box-shadow .12s, transform .1s; }
.wf-stencil-btn:hover { border-color: var(--accent); color: var(--accent-ink); box-shadow: var(--shadow); transform: translateY(-1px); }
.wf-stencil-glyph { width: 30px; height: 18px; border-radius: 3px; background: #cbd5e1; border: 1px solid #94a3b8; display: inline-block; position: relative; }
.wf-stencil-glyph.st-header { height: 12px; background: #101828; }
.wf-stencil-glyph.st-nav { height: 10px; background: #334155; }
.wf-stencil-glyph.st-dropdown { background: #e6e9ef; }
.wf-stencil-glyph.st-dropdown::after { content: ""; position: absolute; top: 3px; left: 4px; width: 0; height: 0; border-left: 5px solid transparent; border-right: 5px solid transparent; border-top: 6px solid #101828; }

.wf-section-btn { grid-column: 1 / -1; border: 1px dashed var(--line-2); border-radius: 8px; background: var(--accent-3); color: var(--accent-ink); padding: 7px 8px; cursor: pointer; font: inherit; font-size: .74rem; font-weight: 800; }
.wf-section-btn:hover { border-color: var(--accent); background: var(--accent-2); }
.wf-stencil-tip { margin: 0; padding: 10px 12px; font-size: .74rem; color: var(--ink-3); line-height: 1.55; }

.wf-stage { min-width: 0; }
.wf-canvas-outer { position: relative; overflow: auto; min-height: 480px; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--surface-2); padding: 20px; box-shadow: var(--shadow); }
.wf-canvas { position: relative; background: var(--surface); border: 1px solid rgba(16,24,40,.08); border-radius: 4px; box-shadow: 0 0 0 1px rgba(16,24,40,.05), 0 10px 30px rgba(16,24,40,.10); transform-origin: top left; overflow: hidden; }
.wf-empty-hint { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; color: var(--ink-3); font-size: .9rem; text-align: center; padding: 30px; pointer-events: none; }
.wf-el { position: absolute; z-index: 2; border: 1.5px solid rgba(100,116,139,.45); border-radius: 4px; display: flex; align-items: center; justify-content: center; font-size: .72rem; font-weight: 800; letter-spacing: .02em; text-align: center; padding: 4px 8px; cursor: move; user-select: none; overflow: hidden; box-shadow: 0 1px 3px rgba(16,24,40,.10); touch-action: none; }
.wf-el.selected { outline: 2px solid var(--accent); outline-offset: 2px; z-index: 3; }
.wf-el-label { pointer-events: none; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 100%; }
.wf-el-text { pointer-events: none; font-size: .64rem; color: inherit; opacity: .8; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 100%; }
.wf-handle { position: absolute; width: 9px; height: 9px; background: var(--accent); border: 1.5px solid #fff; border-radius: 50%; display: none; z-index: 5; box-shadow: 0 0 0 1px var(--accent); }
.wf-el.selected .wf-handle { display: block; }
.wf-handle[data-dir="nw"] { top: -5px; left: -5px; cursor: nwse-resize; }
.wf-handle[data-dir="n"] { top: -5px; left: 50%; margin-left: -5px; cursor: ns-resize; }
.wf-handle[data-dir="ne"] { top: -5px; right: -5px; cursor: nesw-resize; }
.wf-handle[data-dir="e"] { right: -5px; top: 50%; margin-top: -5px; cursor: ew-resize; }
.wf-handle[data-dir="w"] { left: -5px; top: 50%; margin-top: -5px; cursor: ew-resize; }
.wf-handle[data-dir="sw"] { bottom: -5px; left: -5px; cursor: nesw-resize; }
.wf-handle[data-dir="s"] { bottom: -5px; left: 50%; margin-left: -5px; cursor: ns-resize; }
.wf-handle[data-dir="se"] { bottom: -5px; right: -5px; cursor: nwse-resize; }

.wf-ghost { position: absolute; z-index: 1; border: 1.5px dashed var(--accent); border-radius: 4px; background: var(--accent-3); opacity: .45; pointer-events: none; left: 0; top: 0; width: 0; height: 0; }

.wf-stencil-picker { position: absolute; z-index: 20; width: 230px; background: var(--surface); border: 1px solid var(--line-2); border-radius: 10px; box-shadow: var(--shadow-lg); padding: 8px; }
.wf-sp-hd { font-size: .72rem; font-weight: 900; letter-spacing: .06em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 6px; }
.wf-sp-grd { display: grid; grid-template-columns: 1fr 1fr; gap: 4px; }
.wf-sp-btn { display: flex; flex-direction: column; align-items: center; gap: 3px; border: 1px solid var(--line-2); border-radius: 6px; background: var(--surface); color: var(--ink-2); padding: 5px 3px; cursor: pointer; font: inherit; font-size: .66rem; font-weight: 700; }
.wf-sp-btn:hover { border-color: var(--accent); color: var(--accent-ink); background: var(--accent-3); }

.wf-pages { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; margin-top: 10px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 7px; }
.wf-page { display: flex; align-items: center; gap: 4px; border: 1px solid var(--line-2); border-radius: 7px; background: var(--surface); padding: 3px 6px 3px 9px; cursor: pointer; }
.wf-page.active { border-color: var(--accent); background: var(--accent-3); }
.wf-page-name { font: inherit; font-size: .74rem; font-weight: 700; border: none; background: transparent; color: var(--ink); width: 88px; outline: none; }
.wf-page-del { border: none; background: transparent; color: var(--ink-3); cursor: pointer; font-size: .72rem; padding: 0 2px; }
.wf-page-del:hover { color: var(--bad); }
.wf-page-del:disabled { opacity: .35; cursor: default; }
.wf-page-count { font-size: .72rem; font-weight: 800; color: var(--ink-3); margin-left: auto; }

.wf-inspector { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-sm); box-shadow: var(--shadow); overflow: hidden; }
.wf-inspector-hd { padding: 9px 12px; font-size: .7rem; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); background: var(--surface-2); border-bottom: 1px solid var(--line); }
.wf-inspector-body { padding: 12px; }
.wf-insp-hint { color: var(--ink-3); font-size: .8rem; margin: 0; }
.wf-insp-tip { color: var(--ink-3); font-size: .7rem; margin: 12px 0 0; }
.wf-insp-field { margin-bottom: 10px; }
.wf-insp-field label { display: block; font-size: .68rem; font-weight: 800; text-transform: uppercase; letter-spacing: .05em; color: var(--ink-3); margin-bottom: 3px; }
.wf-insp-field input { width: 100%; border: 1px solid var(--line-2); border-radius: 7px; background: var(--surface); color: var(--ink); font: inherit; font-size: .82rem; padding: 5px 8px; }
.wf-insp-field.in-sp-row { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; padding-right: 0; }
.wf-insp-field input[type="color"] { height: 34px; padding: 3px; cursor: pointer; }
@media (max-width: 1100px) { .wf-inspector { display: none; } }
/* ── Sitemap tool ─────────────────────────────────────────── */
.sm-toolbar { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 14px; align-items: center; }
.sm-toolbar .muted { font-size: .78rem; }
.sm-canvas-outer { position: relative; overflow: auto; min-height: 460px; }
.sm-canvas { position: relative; min-height: 460px; background: var(--surface); border-radius: 8px; }
.sm-links { position: absolute; inset: 0; pointer-events: none; z-index: 1; overflow: visible; }
.sm-node {
  position: absolute; z-index: 2; width: 190px;
  border: 2px solid var(--accent); border-radius: 10px; background: var(--surface);
  padding: 10px 12px; text-align: center; cursor: move; box-shadow: var(--shadow);
  user-select: none; touch-action: none;
}
.sm-node.home { border-color: var(--part1); background: var(--part1-2); }
.sm-node .sm-label { font-weight: 800; font-size: .85rem; line-height: 1.25; word-break: break-word; }
.sm-node .sm-note { font-size: .7rem; color: var(--part1); margin-top: 2px; }
.sm-node .sm-page-note { font-size: .7rem; color: var(--ink-2); margin-top: 3px; line-height: 1.3; word-break: break-word; }
.sm-node .sm-del {
  position: absolute; top: -8px; right: -8px; width: 19px; height: 19px; border-radius: 50%;
  background: var(--bad); color: #fff; font-size: .68rem; display: none;
  align-items: center; justify-content: center; cursor: pointer; z-index: 5;
}
.sm-node.selected .sm-del { display: inline-flex; }
.sm-node.selected { outline: 2px solid var(--accent); outline-offset: 2px; }
.sm-annotations { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; margin-top: 12px; box-shadow: var(--shadow); }
.sm-annotations textarea { width: 100%; min-height: 80px; border: 1px solid var(--line-2); border-radius: 9px; background: var(--surface); color: var(--ink); font: inherit; font-size: .9rem; padding: 10px; resize: vertical; }

/* ── Code editor (VS Code / Dreamweaver style) ─────────── */
.ed-app {
  --ed-bg: #1e1e1e;
  --ed-sb: #252526;
  --ed-sb2: #333333;
  --ed-ink: #d4d4d4;
  --ed-ink2: #9d9d9d;
  --ed-accent: #d92d20;   /* red accent */
  --ed-border: #3c3c3c;
  --ed-code-bg: #1e1e1e;
  --ed-gutter-bg: #1e1e1e;
  --ed-gutter-ink: #858585;
  --ed-active-line: #282828;
  border: 1px solid var(--ed-border);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background: var(--ed-bg);
  color: var(--ed-ink);
  font-size: 13.5px;
  position: relative;
}
/* Fullscreen web studio — fills the viewport when the editor tab is open */
body.ed-fullscreen {
  position: fixed; inset: 0; overflow: hidden;
}
body.ed-fullscreen .topbar, body.ra10-refresh-enabled body.ed-fullscreen .topbar,
body.ra10-refresh-enabled.ed-fullscreen .topbar { display: none !important; }
body.ed-fullscreen .footer { display: none; }
body.ed-fullscreen .wrap { max-width: none; padding: 0; height: 100vh; }
body.ed-fullscreen #view-editor { position: fixed; inset: 0; z-index: 100; }
body.ed-fullscreen #view-editor .section-head { display: none; }
body.ed-fullscreen .ed-app {
  border: none; border-radius: 0; height: 100vh; display: flex; flex-direction: column;
}
body.ed-fullscreen .ed-body { flex: 1; min-height: 0; }
body.ed-fullscreen .ed-topbar { border-radius: 0; }
body.ed-fullscreen .ed-status { border-radius: 0; }
body.ed-fullscreen .ra10-refresh-loader, body.ed-fullscreen .ra10-subject-banner { display: none !important; }

.ed-app.ed-theme-dreamweaver {
  --ed-bg: #f5f5f5;
  --ed-sb: #f0f0f0;
  --ed-sb2: #e2e2e2;
  --ed-ink: #333;
  --ed-ink2: #666;
  --ed-accent: #c2410c;
  --ed-border: #d0d0d0;
  --ed-code-bg: #ffffff;
  --ed-gutter-bg: #f0f0f0;
  --ed-gutter-ink: #888;
  --ed-active-line: #feece9;
}

.ed-topbar {
  display: flex; align-items: center; gap: 6px; flex-wrap: wrap;
  padding: 7px 10px;
  background: var(--ed-sb);
  border-bottom: 1px solid var(--ed-border);
}
.ed-logo-img { width: 22px; height: 22px; border-radius: 6px; object-fit: cover; flex: 0 0 auto; }
.ed-logo { font-weight: 900; color: var(--ed-accent); font-size: 1.1rem; margin-right: 4px; }
.ed-title { font-weight: 800; color: var(--ed-ink); margin-right: 6px; font-size: .86rem; }
.ed-spacer { flex: 1; }
.ed-label { font-size: .68rem; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; color: var(--ed-ink2); margin: 0 2px; }
.ed-sep { width: 1px; height: 20px; background: var(--ed-border); margin: 0 4px; }
.ed-btn {
  border: 1px solid var(--ed-border); border-radius: 6px;
  background: var(--ed-sb2); color: var(--ed-ink);
  font: inherit; font-size: .78rem; font-weight: 700;
  padding: 5px 10px; cursor: pointer;
}
.ed-btn:hover { background: var(--ed-accent); color: #fff; border-color: var(--ed-accent); }
.ed-dev, .ed-layout-btn, .ed-x {
  border: 1px solid transparent; border-radius: 6px;
  background: transparent; color: var(--ed-ink2);
  font: inherit; font-size: .9rem; padding: 4px 8px; cursor: pointer; line-height: 1;
}
.ed-dev:hover, .ed-layout-btn:hover, .ed-x:hover { background: var(--ed-sb2); color: var(--ed-ink); }
.ed-dev.active, .ed-layout-btn.active { background: var(--ed-accent); color: #fff; }
.ed-theme-btn {
  border: 1px solid var(--ed-border); border-radius: 6px;
  background: var(--ed-sb2); color: var(--ed-ink);
  font: inherit; font-size: .72rem; font-weight: 700;
  padding: 4px 9px; cursor: pointer;
}
.ed-theme-btn.active { background: var(--ed-accent); color: #fff; border-color: var(--ed-accent); }

.ed-body { display: flex; min-height: 520px; }
.ed-sidebar {
  width: 200px; flex: 0 0 200px;
  background: var(--ed-sb);
  border-right: 1px solid var(--ed-border);
  display: flex; flex-direction: column;
}
.ed-sidebar-title { padding: 10px 12px 6px; font-size: .68rem; font-weight: 800; letter-spacing: .08em; color: var(--ed-ink2); }
.ed-files { flex: 1; overflow-y: auto; padding: 2px 6px 8px; }
.ed-file {
  display: flex; align-items: center; gap: 6px;
  padding: 5px 8px; border-radius: 5px; cursor: pointer;
  color: var(--ed-ink2); font-size: .82rem;
}
.ed-file:hover { background: var(--ed-sb2); color: var(--ed-ink); }
.ed-file.active { background: var(--ed-accent); color: #fff; }
.ed-file-icon { font-size: .9rem; }
.ed-file-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ed-file-del { opacity: 0; font-size: .8rem; padding: 0 2px; }
.ed-file:hover .ed-file-del { opacity: .8; }
.ed-file-del:hover { opacity: 1 !important; color: #f48771; }
.ed-empty { padding: 14px; font-size: .8rem; color: var(--ed-ink2); }
.ed-new-file { display: flex; gap: 4px; padding: 8px; border-top: 1px solid var(--ed-border); }
.ed-new-file input {
  flex: 1; min-width: 0; border: 1px solid var(--ed-border); border-radius: 5px;
  background: var(--ed-bg); color: var(--ed-ink); font: inherit; font-size: .78rem; padding: 5px 8px;
}
.ed-new-file button {
  border: none; border-radius: 5px; background: var(--ed-accent); color: #fff;
  font-weight: 800; font-size: .9rem; padding: 4px 10px; cursor: pointer;
}

.ed-main { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.ed-tabs { display: flex; background: var(--ed-sb); border-bottom: 1px solid var(--ed-border); overflow-x: auto; }
.ed-tab {
  display: flex; align-items: center; gap: 5px;
  padding: 7px 10px; border-right: 1px solid var(--ed-border);
  background: var(--ed-sb); color: var(--ed-ink2);
  font-size: .8rem; cursor: pointer; white-space: nowrap;
  border-top: 2px solid transparent;
}
.ed-tab.active { background: var(--ed-bg); color: var(--ed-ink); border-top-color: var(--ed-accent); }
.ed-tab-close { opacity: 0; font-size: .78rem; padding: 0 2px; border-radius: 3px; }
.ed-tab:hover .ed-tab-close { opacity: .8; }
.ed-tab-close:hover { background: var(--ed-sb2); opacity: 1; }

.ed-panes { display: flex; flex: 1; min-height: 480px; }
.ed-pane { display: flex; flex-direction: column; min-width: 0; }
#ed-code-pane { flex: 1; display: flex; }
.ed-splitter { width: 5px; cursor: col-resize; background: var(--ed-sb2); }
.ed-panes.ed-layout-editor .ed-splitter { display: none; }
.ed-panes.ed-layout-preview #ed-code-pane { display: none !important; }
.ed-panes.ed-layout-editor #ed-preview-pane { display: none !important; }
#ed-preview-pane { flex: 1; display: flex; }

.ed-code-area {
  flex: 1; display: flex; min-height: 0;
  background: var(--ed-code-bg);
  font-family: 'JetBrains Mono', var(--mono), Consolas, monospace;
  position: relative;
}
.ed-code-area.ed-theme-vscode { background: #1e1e1e; }
.ed-code-area.ed-theme-dreamweaver { background: #ffffff; }
.ed-gutter {
  width: 48px; flex: 0 0 48px; overflow: hidden;
  background: var(--ed-gutter-bg); color: var(--ed-gutter-ink);
  text-align: right; padding: 12px 8px 12px 0; user-select: none;
  font-size: 12px; line-height: 1.6;
}
.ed-gutter-line { height: 21.6px; }
#ed-code {
  flex: 1; min-width: 0; resize: none; border: none; outline: none;
  background: transparent; color: var(--ed-ink);
  font-family: 'JetBrains Mono', var(--mono), Consolas, monospace;
  font-size: 13px; line-height: 1.6;
  padding: 12px 14px; tab-size: 2;
  white-space: pre; overflow: auto;
}
.ed-theme-vscode #ed-code { color: #d4d4d4; }

.ed-preview-head {
  display: flex; justify-content: space-between; align-items: center; gap: 8px;
  padding: 7px 12px; background: var(--ed-sb); border-bottom: 1px solid var(--ed-border);
  font-size: .76rem; font-weight: 800; color: var(--ed-ink2); letter-spacing: .05em; text-transform: uppercase;
}
.ed-preview-dev { font-size: .72rem; color: var(--ed-accent); }
#ed-preview-pane iframe { flex: 1; border: none; background: #fff; width: 100%; transition: max-width .25s; }

.ed-status {
  display: flex; align-items: center; gap: 16px;
  padding: 5px 12px; background: var(--ed-accent);
  color: #fff; font-size: .72rem; font-weight: 700;
}
.ed-status .ed-spacer { flex: 1; }
.ed-status-mode { opacity: .9; }
#ed-status-pos { opacity: .9; }
.ed-save-state { font-size: .72rem; font-weight: 700; opacity: .95; }
.ed-save-state.saving { color: #ffe08a; }
.ed-save-state.offline { color: #ffb4a8; }

.ed-template-picker {
  position: absolute; z-index: 50; top: 56px; right: 16px;
  width: 320px; max-width: 90vw;
  background: var(--ed-bg); color: var(--ed-ink);
  border: 1px solid var(--ed-border); border-radius: 10px;
  box-shadow: var(--shadow-lg); padding: 12px;
}
.ed-template-picker.hidden { display: none; }
.ed-template-picker-hd { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; font-size: .84rem; }
.ed-template-buttons { display: flex; gap: 8px; flex-wrap: wrap; }
.ed-template-buttons .btn { font-size: .8rem; }
.ed-app { position: relative; }

/* ── AI Assigner in the editor ─────────────────────────── */
.ed-ai-bubble {
  position: absolute; bottom: 44px; right: 18px; z-index: 80;
  width: 52px; height: 52px; border-radius: 50%;
  background: linear-gradient(135deg, #d92d20, #f97316);
  color: #fff; font-size: 24px; display: flex; align-items: center; justify-content: center;
  cursor: pointer; box-shadow: 0 6px 18px rgba(217,45,32,.42);
  transition: transform .15s; overflow: hidden; padding: 0;
}
.ed-bubble-logo { width: 100%; height: 100%; object-fit: cover; }
.ed-ai-bubble:hover { transform: scale(1.08); }
.ed-ai-bubble.hidden { display: none; }
.ed-ai-panel {
  position: absolute; bottom: 100px; right: 18px; z-index: 85;
  width: 360px; max-width: calc(100vw - 28px);
  background: var(--ed-bg); color: var(--ed-ink);
  border: 1px solid var(--ed-border); border-radius: 14px;
  box-shadow: var(--shadow-lg); display: flex; flex-direction: column; overflow: hidden;
  max-height: 480px;
}
.ed-ai-panel.hidden { display: none; }
.ed-ai-hd {
  display: flex; align-items: center; gap: 8px; padding: 10px 14px;
  background: var(--ed-sb); border-bottom: 1px solid var(--ed-border);
  font-size: .86rem;
}
.ed-ai-hd .ed-x { margin-left: auto; }
.ed-ai-msgs { flex: 1; overflow-y: auto; padding: 12px; display: flex; flex-direction: column; gap: 8px; min-height: 120px; }
.ed-ai-msg { max-width: 92%; padding: 9px 12px; border-radius: 11px; font-size: .82rem; word-break: break-word; line-height: 1.5; }
.ed-ai-msg.bot { align-self: flex-start; background: var(--ed-sb2); border-bottom-left-radius: 4px; }
.ed-ai-msg.user { align-self: flex-end; background: var(--ed-accent); color: #fff; border-bottom-right-radius: 4px; white-space: pre-wrap; }
.ed-ai-msg.bot p { margin: 6px 0; }
.ed-ai-msg.bot ul, .ed-ai-msg.bot ol { margin: 6px 0; padding-left: 20px; }
.ed-ai-msg.bot code { background: rgba(0,0,0,.15); padding: 1px 5px; border-radius: 4px; font-family: var(--ed-mono, var(--mono)); font-size: .8em; }
.ed-ai-msg.bot pre { background: #0f1115; color: #d6e2f0; padding: 10px; border-radius: 8px; overflow: auto; margin: 8px 0; }
.ed-ai-msg.bot pre code { background: none; padding: 0; color: inherit; }
.ed-ai-msg.bot table { border-collapse: collapse; width: 100%; font-size: .78rem; }
.ed-ai-msg.bot th { background: rgba(0,0,0,.1); text-align: left; }
.ed-ai-msg.bot th, .ed-ai-msg.bot td { border: 1px solid var(--ed-border); padding: 4px 8px; }
.ed-ai-msg.bot .ed-examiner-orb, .ed-thinking { display: inline-flex; align-items: center; gap: 8px; }
.ed-examiner-orb {
  width: 14px; height: 14px; border-radius: 50%; flex-shrink: 0;
  background: radial-gradient(circle at 32% 28%, #fff, #67e8f9 25%, #8b5cf6 58%, #ec4899);
  box-shadow: 0 0 8px #22d3ee, 0 0 16px #a855f7;
  animation: ai-examiner-orb 1.15s ease-in-out infinite alternate;
}
.ed-examiner-dots { letter-spacing: 2px; animation: ai-examiner-dots 1.2s steps(4, end) infinite; }
.ed-ai-input { display: flex; gap: 6px; padding: 10px; border-top: 1px solid var(--ed-border); }
.ed-ai-input textarea {
  flex: 1; border: 1px solid var(--ed-border); border-radius: 8px; background: var(--ed-sb);
  color: var(--ed-ink); font: inherit; font-size: .82rem; padding: 8px; resize: none; min-height: 40px;
}
.ed-ai-input button { border: none; border-radius: 8px; background: var(--ed-accent); color: #fff; font-weight: 800; padding: 0 14px; cursor: pointer; }
.ed-ai-footer { padding: 6px 14px; font-size: .66rem; color: var(--ed-ink2); border-top: 1px solid var(--ed-border); }

.ed-selection-pop {
  position: fixed; z-index: 200;
  display: flex; gap: 4px; padding: 5px;
  background: var(--ed-sb); border: 1px solid var(--ed-border); border-radius: 10px;
  box-shadow: var(--shadow-lg);
}
.ed-selection-pop.hidden { display: none; }
.ed-selection-pop button {
  border: none; border-radius: 7px; background: var(--ed-sb2); color: var(--ed-ink);
  font: inherit; font-size: .74rem; font-weight: 700; padding: 5px 10px; cursor: pointer;
}
.ed-selection-pop button:hover { background: var(--ed-accent); color: #fff; }

/* Editor mobile responsive */
@media (max-width: 720px) {
  .ed-topbar { gap: 4px; padding: 6px 8px; }
  .ed-label, .ed-sep { display: none; }
  .ed-btn { font-size: .7rem; padding: 4px 7px; }
  .ed-dev, .ed-layout-btn { font-size: .82rem; padding: 3px 6px; }
  .ed-body { min-height: 0; }
  .ed-sidebar { width: 150px; flex: 0 0 150px; }
  .ed-sidebar-title { font-size: .6rem; }
  .ed-file { font-size: .74rem; padding: 4px 6px; }
  .ed-panes { min-height: 0; }
  .ed-gutter { width: 34px; flex: 0 0 34px; padding-right: 5px; font-size: 10px; }
  #ed-code { font-size: 11px; padding: 10px 8px; }
  .ed-ai-panel { width: calc(100vw - 20px); right: 10px; left: 10px; bottom: 90px; }
  .ed-ai-bubble { right: 14px; bottom: 40px; }
}

/* ── Assignment hub (redesigned, calm) ──────────────────── */
.assign-eyebrow { font-size: .86rem; color: var(--ink-2); margin-bottom: 12px; }
.assign-pick-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; }
.assign-pick-top .assign-eyebrow { margin-bottom: 0; }
.assign-pdf-btn { display: inline-flex; align-items: center; gap: 8px; font-weight: 800; }
.assign-pdf-btn .pdf-ico { font-size: 1.05rem; }
.assign-task-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
@media (max-width: 760px) { .assign-task-cards { grid-template-columns: 1fr; } }

/* Sample assignment PDF cards */
.assign-samples { margin-bottom: 24px; }
.assign-samples-hd h3 { margin: 0 0 4px; font-size: 1.2rem; }
.assign-samples-hd p { margin: 0 0 14px; font-size: .88rem; color: var(--ink-2); max-width: 760px; }
.assign-sample-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 12px; }
.assign-sample-card {
  display: flex; flex-direction: column; gap: 12px; padding: 16px;
  border: 1.5px solid var(--line); border-radius: var(--radius); background: var(--surface);
  box-shadow: var(--shadow); transition: border-color .15s, transform .12s;
}
.assign-sample-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.as-pdf-ico { font-size: 2rem; line-height: 1; flex-shrink: 0; }
.as-pdf-info { flex: 1; min-width: 0; }
.as-pdf-info b { display: block; font-size: .95rem; }
.as-pdf-info small { font-size: .74rem; color: var(--ink-3); }
.as-pdf-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.as-pdf-actions .btn { font-size: .78rem; padding: 7px 12px; white-space: nowrap; }
.as-pdf-samples { display: flex; flex-direction: column; gap: 6px; border-top: 1px solid var(--line); padding-top: 10px; }
.assign-accdb-dl { text-decoration: none; display: inline-flex; align-items: center; gap: 6px; justify-content: center; font-size: .78rem; padding: 7px 12px; border-radius: var(--radius-sm); border: 1px solid var(--line-2); background: var(--surface-2); color: var(--ink-2); font-weight: 700; white-space: nowrap; }
.assign-accdb-dl:hover { border-color: var(--accent); color: var(--accent-ink); background: var(--accent-3); }
.as-sample-note { font-size: .72rem; color: var(--ink-3); display: inline-flex; align-items: center; gap: 5px; }

/* "What Pearson wants to see" criteria columns */
.assign-criteria { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 18px; margin-bottom: 12px; box-shadow: var(--shadow); }.acr-hd { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-bottom: 12px; }
.acr-hd b { font-size: .95rem; }
.acr-cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
@media (max-width: 760px) { .acr-cols { grid-template-columns: 1fr; } }
.acr-col { border-radius: 10px; border: 1px solid var(--line); padding: 12px; }
.acr-col.acr-pass { border-top: 3px solid var(--ok); background: var(--ok-2); }
.acr-col.acr-merit { border-top: 3px solid var(--accent); background: var(--accent-3); }
.acr-col.acr-distinction { border-top: 3px solid var(--part2); background: var(--part2-2); }
.acr-badge { display: inline-block; font-weight: 900; font-size: .78rem; margin-bottom: 8px; }
.acr-pass .acr-badge { color: var(--ok); }
.acr-merit .acr-badge { color: var(--accent-ink); }
.acr-distinction .acr-badge { color: var(--part2); }
.acr-item { font-size: .8rem; color: var(--ink-2); line-height: 1.45; margin-bottom: 8px; }
.acr-item:last-child { margin-bottom: 0; }
.acr-item b { color: var(--ink); }

/* "How to write & improve" guide */
.assign-guide { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 18px; margin-bottom: 12px; box-shadow: var(--shadow); }
.asg-hd { margin-bottom: 12px; }
.asg-hd b { display: block; font-size: .95rem; }
.asg-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
@media (max-width: 900px) { .asg-grid { grid-template-columns: 1fr; } }
.asg-card { border-radius: 10px; border: 1px solid var(--line); padding: 12px 14px; }
.asg-card h4 { margin: 0 0 8px; font-size: .88rem; }
.asg-card p { margin: 0; font-size: .82rem; color: var(--ink-2); line-height: 1.55; }
.asg-card ul { margin: 0; padding-left: 18px; }
.asg-card li { font-size: .82rem; color: var(--ink-2); line-height: 1.5; margin-bottom: 6px; }
.asg-card li b { color: var(--ink); }
.asg-structure { border-top: 3px solid var(--part1); background: var(--part1-2); }
.asg-distinction { border-top: 3px solid var(--part2); background: var(--part2-2); }
.asg-mistakes { border-top: 3px solid var(--bad); background: var(--bad-2); }

.assign-card {
  display: flex; flex-direction: column; align-items: flex-start; gap: 8px;
  border: 1.5px solid var(--line); border-radius: var(--radius); background: var(--surface);
  color: var(--ink); padding: 16px; cursor: pointer; font: inherit; text-align: left;
  transition: border-color .15s, box-shadow .15s, transform .12s;
}
.assign-card:hover { box-shadow: var(--shadow); transform: translateY(-2px); }
.assign-card.active { border-color: var(--accent); background: var(--accent-3); }
.assign-card-ico { font-size: 1.7rem; }
.assign-card-tx b { display: block; font-size: .95rem; margin-bottom: 3px; }
.assign-card-tx small { font-size: .78rem; color: var(--ink-2); line-height: 1.3; display: block; }
.assign-card-prog { display: flex; align-items: center; gap: 8px; width: 100%; margin-top: 4px; }
.assign-card-prog .p-bar { flex: 1; height: 6px; border-radius: 999px; background: var(--surface-2); overflow: hidden; }
.assign-card-prog .p-bar i { display: block; height: 100%; border-radius: inherit; background: var(--accent); transition: width .2s; }
.assign-card-prog em { font-style: normal; font-size: .72rem; font-weight: 800; color: var(--ink-3); }

.assign-panel { margin-top: 18px; }

.assign-what {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px; box-shadow: var(--shadow);
}
.aw-hd { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
.aw-ico { font-size: 1.6rem; }
.aw-hd div { }
.aw-hd b { display: block; font-size: 1rem; }
.aw-hd small { font-size: .76rem; color: var(--ink-3); }
.assign-what p { margin: 0; font-size: .94rem; color: var(--ink-2); line-height: 1.6; }

.assign-cta { display: flex; gap: 10px; flex-wrap: wrap; margin: 14px 0; }
.assign-cta .btn { flex: 1 1 200px; flex-direction: column; gap: 3px; padding: 14px; border-radius: var(--radius); }
.assign-cta .btn small { font-size: .72rem; font-weight: 600; opacity: .85; font-weight: 600; }

.assign-steps, .assign-bref {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  margin-bottom: 12px; box-shadow: var(--shadow); overflow: hidden;
}
.as-toggle {
  display: flex; justify-content: space-between; align-items: center; width: 100%;
  border: none; background: var(--surface-2); font: inherit; font-weight: 800;
  font-size: .92rem; color: var(--ink); padding: 14px 18px; cursor: pointer;
}
.as-toggle:hover { background: var(--accent-3); color: var(--accent-ink); }
.as-cherr { transition: transform .18s; font-size: .8rem; opacity: .7; }
.assign-steps.open .as-cherr, .assign-bref.open .as-cherr { transform: rotate(180deg); }
.as-body { display: none; padding: 14px 18px; }
.as-body.open { display: block; }
.as-step { padding: 8px 0 8px 18px; position: relative; font-size: .92rem; color: var(--ink-2); line-height: 1.55; border-bottom: 1px dashed var(--line); }
.as-step:last-child { border-bottom: none; }
.as-step::before { content: ""; position: absolute; left: 2px; top: 14px; width: 8px; height: 8px; border-radius: 50%; background: var(--accent); }
.as-step b { color: var(--ink); }

.assign-chck { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 18px; margin-bottom: 12px; box-shadow: var(--shadow); }
.ach-hd { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-bottom: 6px; }
.ach-hd b { font-size: .95rem; }
.assign-check-lst { list-style: none; margin: 6px 0 0; padding: 0; }
.assign-check-lst li { display: flex; align-items: flex-start; gap: 10px; padding: 8px 0; border-bottom: 1px solid var(--line); font-size: .9rem; }
.assign-check-lst li:last-child { border-bottom: none; }
.assign-check-lst input[type="checkbox"] { margin-top: 4px; accent-color: var(--ok); width: 16px; height: 16px; }
.assign-check-lst li.done span { text-decoration: line-through; color: var(--ink-3); }

.assign-grades { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 18px; box-shadow: var(--shadow); }
.ag-hd { margin-bottom: 10px; }
.ag-hd b { display: block; font-size: .95rem; }
.ag-hd small { font-size: .76rem; color: var(--ink-3); }
.ag-rows { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
@media (max-width: 760px) { .ag-rows { grid-template-columns: 1fr; } }
.ag-row { border-radius: 10px; border: 1px solid var(--line); padding: 10px 12px; }
.ag-row.pass { border-top: 3px solid var(--ok); background: var(--ok-2); }
.ag-row.merit { border-top: 3px solid var(--accent); background: var(--accent-3); }
.ag-row.distinction { border-top: 3px solid var(--part2); background: var(--part2-2); }
.ag-badge { display: inline-block; font-weight: 900; font-size: .8rem; margin-bottom: 4px; }
.ag-row.pass .ag-badge { color: var(--ok); }
.ag-row.merit .ag-badge { color: var(--accent-ink); }
.ag-row.distinction .ag-badge { color: var(--part2); }
.ag-row p { margin: 0; font-size: .8rem; color: var(--ink-2); }

.brief-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 8px; }
.brief-card { border: 1.5px dashed var(--line-2); border-radius: 10px; background: var(--surface); padding: 12px; cursor: pointer; font: inherit; text-align: left; transition: border-color .12s, transform .1s; }
.brief-card:hover { border-color: var(--accent); transform: translateY(-1px); }
.brief-card b { display: block; font-size: .86rem; margin-bottom: 3px; }
.brief-card small { font-size: .72rem; color: var(--ink-3); }

/* ── Practice brief modal ─────────────────────────────────── */
.brief-modal { position: fixed; inset: 0; z-index: 1000; display: flex; align-items: center; justify-content: center; padding: 20px; }
body.ra10-refresh-enabled .brief-modal, body.ra10-refresh-enabled > .brief-modal { position: fixed !important; }
.brief-modal-backdrop { position: absolute; inset: 0; background: rgba(10, 6, 8, .5); backdrop-filter: blur(3px); animation: fadeIn .15s ease; }
.brief-modal-card {
  position: relative; width: 100%; max-width: 620px; max-height: 82vh; overflow: auto;
  background: var(--surface); border: 1px solid var(--line); border-radius: 16px;
  box-shadow: var(--shadow-lg); display: flex; flex-direction: column; animation: fadeIn .18s ease;
}
.brief-m-head { display: flex; align-items: center; gap: 12px; padding: 16px 20px; border-bottom: 1px solid var(--line); background: linear-gradient(90deg, var(--accent-3), var(--surface-2)); }
.brief-m-logo { width: 34px; height: 34px; border-radius: 8px; flex-shrink: 0; }
.brief-m-titles { flex: 1; min-width: 0; }
.brief-m-titles b { display: block; font-size: 1rem; }
.brief-m-titles span { font-size: .78rem; color: var(--ink-2); }
.brief-m-x { border: none; background: var(--surface); color: var(--ink-2); border-radius: 50%; width: 32px; height: 32px; font-size: 1rem; cursor: pointer; display: inline-flex; align-items: center; justify-content: center; }
.brief-m-x:hover { background: var(--accent); color: #fff; }
.brief-m-tabs { display: flex; gap: 6px; padding: 10px 14px 0; flex-wrap: wrap; }
.brief-m-tab { border: 1px solid var(--line-2); background: transparent; color: var(--ink-2); font: inherit; font-weight: 700; font-size: .78rem; padding: 6px 12px; border-radius: 999px; cursor: pointer; }
.brief-m-tab.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.brief-m-body { padding: 16px 20px; overflow: auto; }
.brief-m-body h4 { margin: 14px 0 4px; font-size: .82rem; text-transform: uppercase; letter-spacing: .04em; color: var(--accent-ink); }
.brief-m-body h4:first-child { margin-top: 0; }
.brief-m-body p { margin: 0 0 8px; font-size: .92rem; color: var(--ink-2); line-height: 1.55; }
.brief-m-list { margin: 4px 0 0; padding-left: 18px; }
.brief-m-list li { font-size: .9rem; color: var(--ink-2); margin-bottom: 6px; line-height: 1.5; }
.brief-m-foot { display: flex; gap: 10px; justify-content: flex-end; padding: 14px 20px; border-top: 1px solid var(--line); background: var(--surface-2); }

.upload-panel { border: 2px dashed var(--line-2); border-radius: var(--radius); padding: 18px; text-align: center; background: var(--surface-2); }
.upload-panel.dragover { border-color: var(--accent); background: var(--accent-3); }
.upload-panel textarea {
  width: 100%; min-height: 160px; border: 1px solid var(--line-2); border-radius: 10px;
  background: var(--surface); color: var(--ink); font: inherit; font-size: .92rem; padding: 12px; resize: vertical;
  margin: 12px 0; text-align: left;
}

/* ── Mark result ──────────────────────────────────────────── */
.mark-result { margin-top: 16px; text-align: left; }
.mark-grade-badge {
  display: inline-block; font-size: 1.1rem; font-weight: 900;
  border-radius: 12px; padding: 8px 18px; margin-bottom: 12px;
}
.mark-grade-badge.g-Not { background: var(--bad-2); color: var(--bad); }
.mark-grade-badge.g-Pass { background: var(--ok-2); color: var(--ok); }
.mark-grade-badge.g-Merit { background: var(--accent-2); color: var(--accent-ink); }
.mark-grade-badge.g-Distinction { background: var(--part2-2); color: var(--part2); }
.mark-criteria { list-style: none; margin: 10px 0; padding: 0; }
.mark-criteria li { display: flex; gap: 8px; align-items: flex-start; padding: 7px 0; border-bottom: 1px solid var(--line); font-size: .9rem; }
.mark-criteria .tick { color: var(--ok); font-weight: 900; }
.mark-criteria .cross { color: var(--bad); font-weight: 900; }

/* ── Assignment PDF viewer (Unit 1 predicted-paper style) ─── */
body.pv-open { overflow: hidden !important; }
.pdf-viewer {
  position: fixed !important; inset: 0 !important; z-index: 100000 !important;
  display: flex; flex-direction: column;
  background: linear-gradient(180deg, #eef2ff 0%, #f7f2eb 100%);
}
.pv-topbar {
  flex: 0 0 auto; display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap;
  padding: 10px 14px; background: #fff; border-bottom: 1px solid #d7deef;
  box-shadow: 0 6px 18px rgba(23, 35, 72, .12); z-index: 10;
}
.pv-group { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.pv-title {
  font-size: .82rem; font-weight: 800; color: #18213f; background: #eef3ff; border: 1px solid #d8e2ff;
  padding: 7px 11px; border-radius: 10px; max-width: 320px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.pv-btn {
  border: 1px solid #ced8f1; background: #f7f9ff; color: #1f2b4f;
  font: inherit; font-size: .82rem; font-weight: 700; line-height: 1;
  padding: 8px 11px; border-radius: 10px; cursor: pointer;
}
.pv-btn:hover { background: #edf3ff; border-color: #b8c8ef; }
.pv-btn-primary { background: linear-gradient(135deg, #1f6feb 0%, #154aa8 100%); border-color: #245fca; color: #fff; }
.pv-btn-primary:hover { background: linear-gradient(135deg, #2b7dff 0%, #1e5ac6 100%); }
.pv-zoom, .pv-counter {
  min-width: 52px; text-align: center; font-size: .82rem; font-weight: 800; color: #162244;
  padding: 8px 8px; border-radius: 10px; background: #f1f5ff; border: 1px solid #d7e1fb;
}
.pv-stage { flex: 1 1 auto; overflow-y: auto; padding: 22px 14px 40px; -webkit-overflow-scrolling: touch; }
.pv-page {
  width: 210mm; min-height: 297mm; margin: 0 auto 22px auto;
  background: #fff; border: 1px solid #d8dce8; border-radius: 14px;
  box-shadow: 0 18px 44px rgba(26, 26, 46, .14);
  padding: 16mm 18mm; position: relative;
  font-family: Arial, Helvetica, sans-serif; font-size: 10.5pt; color: #111 !important; line-height: 1.45;
}
.pv-page, .pv-page p, .pv-page li, .pv-page td, .pv-page h3, .pv-page h4, .pv-page ul, .pv-page ol, .pv-page b, .pv-page strong, .pv-page div, .pv-page span { color: #111 !important; }
[data-theme="dark"] .pv-page, [data-theme="dark"] .pv-page p, [data-theme="dark"] .pv-page li, [data-theme="dark"] .pv-page td, [data-theme="dark"] .pv-page h3, [data-theme="dark"] .pv-page h4, [data-theme="dark"] .pv-page ul, [data-theme="dark"] .pv-page ol, [data-theme="dark"] .pv-page b, [data-theme="dark"] .pv-page strong, [data-theme="dark"] .pv-page div, [data-theme="dark"] .pv-page span { color: #111 !important; }
.pv-page h1, .pv-page h2 { color: #00247d !important; }
[data-theme="dark"] .pv-page h1, [data-theme="dark"] .pv-page h2 { color: #00247d !important; }
.pv-page .pv-sub, .pv-page .pv-meta { color: #333 !important; }
[data-theme="dark"] .pv-page .pv-sub, [data-theme="dark"] .pv-page .pv-meta { color: #333 !important; }
.pv-page .pv-crit th { color: #fff !important; }
[data-theme="dark"] .pv-page .pv-crit th { color: #fff !important; }
.pv-page .pv-footer { color: #555 !important; }
[data-theme="dark"] .pv-page .pv-footer { color: #555 !important; }
.pv-page h1 { font-size: 15pt; margin: 2px 0; color: #00247d; }
.pv-page h2 { font-size: 12.5pt; margin: 14px 0 4px; color: #00247d; border-bottom: 1px solid #00247d; padding-bottom: 2px; }
.pv-page h3 { font-size: 11.5pt; margin: 12px 0 4px; }
.pv-page p { margin: 5px 0; }
.pv-page ul, .pv-page ol { margin: 4px 0 4px 20px; padding: 0; }
.pv-page li { margin: 2px 0; }
.pv-masthead { border-top: 5px solid #00247d; padding-top: 8px; margin-bottom: 4px; overflow: hidden; }
.pv-paper-code { float: right; font-weight: 700; font-size: 12pt; color: #00247d; border: 1px solid #00247d; padding: 4px 8px; }
.pv-sub { font-size: 10pt; color: #333; }
.pv-meta { font-size: 10pt; color: #333; border-bottom: 1px solid #bbb; padding: 2px 0 8px; margin-bottom: 6px; }
.pv-task { border: 1.2px solid #aab4c4; border-top: 3px solid #00247d; padding: 10px 14px; margin: 12px 0; }
.pv-task h3 { margin-top: 0; }
.pv-evid { border: 1px solid #aab4c4; border-left: 4px solid #00247d; background: #f4f6fa; padding: 7px 10px; margin: 6px 0; }
.pv-evid b { font-size: 10pt; display: block; margin-bottom: 4px; }
.pv-crit { width: 100%; border-collapse: collapse; margin: 6px 0; font-size: 8.8pt; table-layout: fixed; }
.pv-crit th { background: #00247d; color: #fff; padding: 5px 7px; text-align: left; font-size: 9.5pt; }
.pv-crit td { border: 1px solid #aab4c4; padding: 5px 7px; vertical-align: top; }
.pv-footer { position: absolute; bottom: 12mm; left: 18mm; right: 18mm; display: flex; justify-content: space-between; font-size: 9pt; color: #555; border-top: 1px solid #ccc; padding-top: 4px; }

@media (max-width: 720px) {
  .pv-topbar { border-radius: 0; padding: 8px 10px; gap: 8px; }
  .pv-group { width: 100%; flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; }
  .pv-group::-webkit-scrollbar { display: none; }
  .pv-title, .pv-btn, .pv-zoom, .pv-counter { flex: 0 0 auto; }
  .pv-stage { padding: 12px 6px 30px; }
  .pv-page { width: calc(100vw - 12px); min-height: auto; padding: 14px 14px 48px; border-radius: 12px; font-size: 9.5pt; }
  .pv-footer { left: 14px; right: 14px; bottom: 14px; }
  /* Compact, single-row toolbar on phones */
  .pv-topbar { padding: 6px 8px; gap: 6px; }
  .pv-group { gap: 6px; }
  .pv-title { max-width: 150px; font-size: .74rem; padding: 6px 9px; }
  .pv-btn { font-size: .74rem; padding: 6px 9px; }
  .pv-zoom, .pv-counter { min-width: 44px; font-size: .74rem; padding: 6px 6px; }
  .pv-btn-primary { white-space: nowrap; }
  /* Make the criteria table scroll horizontally instead of squashing */
  .pv-page .pv-crit { font-size: 8pt; }
  .pv-page .pv-crit th, .pv-page .pv-crit td { padding: 4px 5px; }
}

@media print {
  html, body { overflow: visible !important; height: auto !important; }
  body.pv-open > *:not(.pdf-viewer) { display: none !important; }
  body.pv-open { overflow: visible !important; background: #fff !important; }
  .pdf-viewer { position: static !important; inset: auto !important; display: block; background: #fff !important; }
  .pv-topbar { display: none !important; }
  .pv-stage { overflow: visible !important; padding: 0 !important; }
  .pv-page {
    width: 100% !important; min-height: auto !important;
    margin: 0 !important; transform: none !important;
    box-shadow: none !important; border: none !important; border-radius: 0 !important;
    page-break-after: always; overflow: visible !important; padding: 16mm 18mm !important;
  }
  .pv-page:last-child { page-break-after: auto; }
}

/* ── AI Assigner (Google Gemini-style client) ─────────────── */
.ai-client {
  display: flex; flex-direction: column; height: 100%;
  background: var(--surface); color: var(--ink);
}

/* Header */
.ai-head {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 12px 18px; border-bottom: 1px solid var(--line); flex-wrap: wrap;
}
.ai-head-brand { display: flex; align-items: center; gap: 10px; min-width: 0; }
.ai-logo { display: inline-flex; color: var(--accent); line-height: 0; }
.ai-logo-svg { display: block; }
.ai-brand-name { font-size: 1.18rem; font-weight: 800; letter-spacing: -0.01em; }
.ai-newchat {
  border: 1px solid var(--line-2); background: var(--surface); color: var(--ink);
  font: inherit; font-weight: 600; font-size: .82rem; padding: 8px 15px; border-radius: 999px; cursor: pointer;
  display: inline-flex; align-items: center; gap: 6px; white-space: nowrap;
}
.ai-newchat:hover { background: var(--surface-2); border-color: var(--line); }

/* Mode segmented control */
.ai-modes { display: flex; justify-content: center; gap: 4px; padding: 10px 14px; border-bottom: 1px solid var(--line); }
.ai-mode {
  border: none; background: transparent; color: var(--ink-2);
  font: inherit; font-weight: 600; font-size: .84rem; padding: 7px 16px; border-radius: 999px; cursor: pointer;
  transition: background .15s, color .15s;
}
.ai-mode:hover { background: var(--surface-2); color: var(--ink); }
.ai-mode.active { background: var(--accent-3); color: var(--accent-ink); font-weight: 800; }

/* Examiner panel */
.ai-examiner { padding: 14px; max-width: 820px; margin: 0 auto 12px; width: calc(100% - 32px); border: 1px solid var(--line); border-radius: 14px; background: var(--surface-2); }
.ai-examiner-row { display: flex; gap: 12px; flex-wrap: wrap; }
.ai-examiner-txt { flex: 1; min-width: 200px; }
.ai-examiner-txt textarea { width: 100%; min-height: 90px; border: 1px solid var(--line-2); border-radius: 12px; background: var(--surface); color: var(--ink); font: inherit; font-size: .88rem; padding: 10px; resize: vertical; }
.ai-upload-zone {
  border: 2px dashed var(--line-2); border-radius: 14px; padding: 14px;
  text-align: center; background: var(--surface); cursor: pointer; flex: 1; min-width: 180px;
  display: flex; align-items: center; justify-content: center;
}
.ai-upload-zone:hover, .ai-upload-zone:focus-visible { border-color: var(--accent); background: var(--accent-3); }
.ai-upload-zone.drag { border-color: var(--accent); background: var(--accent-3); }
.ai-upload-zone.loading { opacity: .7; pointer-events: none; }
.ai-upload-inner { display: flex; flex-direction: column; gap: 3px; align-items: center; }
.ai-upload-inner .ai-upload-ico { font-size: 1.5rem; line-height: 1; }
.ai-upload-inner b { font-size: .9rem; }
.ai-upload-inner small { font-size: .72rem; color: var(--ink-3); }
.ai-file-chip {
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
  background: var(--accent-3); border: 1px solid var(--accent-2); border-radius: 999px;
  padding: 5px 6px 5px 14px; margin-top: 8px; font-size: .8rem; font-weight: 700; color: var(--accent-ink);
}
.ai-file-chip span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ai-file-chip button { border: none; background: var(--accent-2); color: var(--accent-ink); border-radius: 999px; width: 22px; height: 22px; font-size: .7rem; cursor: pointer; display: inline-flex; align-items: center; justify-content: center; flex: 0 0 auto; }
.ai-file-chip button:hover { background: var(--accent); color: #fff; }
.ai-examiner-actions { margin-top: 10px; }

/* Minimized examiner bar (shown after work is loaded) */
.ai-examiner-min {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  background: var(--surface); border: 1px solid var(--line-2); border-radius: 12px;
  padding: 10px 12px;
}
.ai-examiner-min-ico { font-size: 1.2rem; line-height: 1; flex-shrink: 0; }
.ai-examiner-min-name {
  flex: 1; min-width: 120px; font-size: .82rem; font-weight: 700; color: var(--ink);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.ai-examiner-min .btn { flex: 0 0 auto; padding: 7px 12px; font-size: .8rem; }
/* When minimized, hide the big upload + textarea + full actions */
.ai-examiner.min .ai-examiner-row,
.ai-examiner.min .ai-file-chip,
.ai-examiner.min .ai-examiner-actions { display: none; }
.ai-examiner.min .ai-examiner-min { display: flex; }
.ai-examiner:not(.min) .ai-examiner-min { display: none; }

/* Messages */
.ai-msgs { flex: 1; overflow-y: auto; padding: 20px 16px 8px; display: flex; flex-direction: column; gap: 16px; width: 100%; max-width: 820px; margin: 0 auto; }
.ai-msg { max-width: 100%; }
.ai-msg.bot {
  align-self: flex-start; position: relative; padding-left: 38px; max-width: 100%;
  font-size: .94rem; line-height: 1.6; color: var(--ink); word-break: break-word;
}
.ai-msg.bot .ai-avatar {
  position: absolute; left: 0; top: 2px; width: 28px; height: 28px; border-radius: 50%;
  background: var(--accent-2); color: var(--accent);
  display: inline-flex; align-items: center; justify-content: center; flex: 0 0 auto;
}
.ai-msg.user {
  align-self: flex-end; background: var(--accent-3); color: var(--ink);
  padding: 11px 16px; border-radius: 18px 18px 6px 18px; font-size: .94rem; line-height: 1.55;
  max-width: 82%; white-space: pre-wrap; word-break: break-word;
}
.ai-msg-copy {
  position: absolute; bottom: -2px; right: 0;
  border: none; background: transparent; color: var(--ink-3); font: inherit; font-size: .72rem; font-weight: 700; cursor: pointer; padding: 2px 6px; border-radius: 6px;
}
.ai-msg-copy:hover { background: var(--surface-2); color: var(--ink); }

/* Suggestions */
.ai-suggestions { display: flex; flex-wrap: wrap; gap: 8px; padding: 2px 16px 10px; width: 100%; max-width: 820px; margin: 0 auto; }
.ai-suggestions-label { width: 100%; font-size: .8rem; font-weight: 700; color: var(--ink-3); margin-bottom: 2px; }
.ai-suggestion {
  border: 1px solid var(--line-2); background: var(--surface); color: var(--ink-2);
  font: inherit; font-size: .82rem; padding: 8px 15px; border-radius: 999px; cursor: pointer; transition: border-color .12s, background .12s;
}
.ai-suggestion:hover { border-color: var(--accent); background: var(--accent-3); color: var(--accent-ink); }

/* Markdown in bot messages */
.ai-msg.bot p { margin: 6px 0; }
.ai-msg.bot h1, .ai-msg.bot h2, .ai-msg.bot h3, .ai-msg.bot h4 { margin: 12px 0 4px; line-height: 1.25; }
.ai-msg.bot h1 { font-size: 1.12rem; } .ai-msg.bot h2 { font-size: 1.02rem; }
.ai-msg.bot h3 { font-size: .96rem; } .ai-msg.bot h4 { font-size: .9rem; color: var(--accent-ink); }
.ai-msg.bot ul, .ai-msg.bot ol { margin: 6px 0; padding-left: 20px; }
.ai-msg.bot li { margin: 3px 0; }
.ai-msg.bot code { background: rgba(0,0,0,.07); padding: 1px 6px; border-radius: 5px; font-family: var(--mono); font-size: .82em; }
[data-theme="dark"] .ai-msg.bot code { background: rgba(255,255,255,.12); }
.ai-msg.bot pre { background: #0f1115; color: #d6e2f0; padding: 12px; border-radius: 10px; overflow: auto; margin: 8px 0; }
.ai-msg.bot pre code { background: none; padding: 0; color: inherit; }
.ai-code-lang { display: block; font-size: .68rem; font-weight: 700; color: var(--ink-3); text-transform: uppercase; letter-spacing: .06em; margin-bottom: 4px; }
.ai-table-wrap { overflow-x: auto; margin: 8px 0; }
.ai-tasks { list-style: none !important; padding-left: 0 !important; margin: 6px 0 !important; }
.ai-task { display: flex; align-items: flex-start; gap: 9px; margin: 5px 0 !important; }
.ai-check {
  flex: 0 0 auto; width: 16px; height: 16px; margin-top: 2px; border-radius: 4px;
  border: 1.5px solid var(--line-2); background: var(--surface); position: relative;
}
.ai-check.checked { background: var(--accent); border-color: var(--accent); }
.ai-check.checked::after { content: ''; position: absolute; left: 4px; top: 1px; width: 4px; height: 8px; border: solid #fff; border-width: 0 2px 2px 0; transform: rotate(45deg); }
.ai-msg.bot blockquote { border-left: 3px solid var(--line-2); margin: 8px 0; padding: 2px 12px; color: var(--ink-2); }
.ai-msg.bot a { color: var(--accent); text-decoration: underline; }
.ai-msg.bot table { border-collapse: collapse; width: 100%; font-size: .84rem; }
.ai-msg.bot th { background: var(--accent-3); text-align: left; }
.ai-msg.bot th, .ai-msg.bot td { border: 1px solid var(--line-2); padding: 5px 9px; }
.ai-msg.bot strong em { font-style: italic; }

/* Thinking / generating */
.ai-thinking { display: flex; align-items: center; gap: 10px; color: var(--ink-2); font-size: .86rem; position: relative; padding-left: 38px; }
.ai-thinking .ai-avatar-small {
  position: absolute; left: 0; top: 0; width: 28px; height: 28px; border-radius: 50%;
  background: var(--accent-2); color: var(--accent);
  display: inline-flex; align-items: center; justify-content: center;
  animation: ai-logo-pulse 1.6s ease-in-out infinite;
}
.ai-thinking-status { font-weight: 600; }
.ai-thinking-dots::after { content: ''; animation: ai-thinking-dots 1.2s steps(4, end) infinite; }
@keyframes ai-thinking-dots { 0% { content: ''; } 25% { content: '.'; } 50% { content: '..'; } 75% { content: '...'; } 100% { content: ''; } }
@keyframes ai-logo-pulse { 0%, 100% { transform: scale(1); opacity: 1; } 50% { transform: scale(.82); opacity: .65; } }

/* Mark result card */
.ai-mark-card { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 14px; }
.ai-mark-criteria { margin: 8px 0; }
.ai-mark-crit { display: flex; gap: 8px; align-items: flex-start; padding: 6px 0; border-bottom: 1px solid var(--line); font-size: .88rem; }
.ai-mark-crit:last-child { border-bottom: none; }
.ai-mark-crit .tick { color: var(--ok); font-weight: 900; }
.ai-mark-crit .cross { color: var(--bad); font-weight: 900; }
.ai-mark-card h4 { margin: 10px 0 4px; font-size: .88rem; }
.ai-mark-card ul { margin: 4px 0; padding-left: 18px; }
.ai-mark-card li { font-size: .86rem; margin: 2px 0; }

/* Composer (input + disclaimer) */
.ai-composer { border-top: 1px solid var(--line); background: var(--surface); }
.ai-input-row { display: flex; align-items: flex-end; gap: 8px; padding: 12px 16px 4px; position: relative; max-width: 820px; margin: 0 auto; width: 100%; }
.ai-plus { width: 42px; height: 42px; border: 1px solid var(--line-2); border-radius: 50%; background: var(--surface); color: var(--ink-2); font-size: 1.2rem; cursor: pointer; flex-shrink: 0; display: inline-flex; align-items: center; justify-content: center; }
.ai-plus:hover { background: var(--surface-2); }
.ai-plus-menu { position: absolute; bottom: 58px; left: 16px; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow-lg); padding: 6px; z-index: 30; min-width: 180px; }
.ai-plus-menu button { display: flex; align-items: center; gap: 8px; width: 100%; border: none; background: transparent; color: var(--ink); font: inherit; font-size: .86rem; padding: 9px 12px; border-radius: 8px; cursor: pointer; text-align: left; }
.ai-plus-menu button:hover { background: var(--surface-2); }
.ai-input-row textarea {
  flex: 1; border: 1px solid var(--line-2); border-radius: 24px; background: var(--surface);
  color: var(--ink); font: inherit; font-size: .95rem; padding: 11px 18px; resize: none; min-height: 44px; max-height: 160px; line-height: 1.4;
  box-shadow: var(--shadow);
}
.ai-input-row textarea:focus { outline: none; border-color: var(--accent); }
.ai-mode-bar {
  position: relative; display: flex; align-items: center; gap: 10px;
  padding: 8px 16px 2px; max-width: 820px; margin: 0 auto; width: 100%;
}
.ai-mode-label { font-size: .8rem; font-weight: 800; color: var(--ink-2); text-transform: capitalize; }
.ai-mode-btn {
  width: 42px; height: 42px; border: 1px solid var(--line-2); border-radius: 50%;
  background: var(--surface); color: var(--accent); cursor: pointer; flex-shrink: 0;
  display: inline-flex; align-items: center; justify-content: center;
}
.ai-mode-btn:hover { background: var(--accent-3); border-color: var(--accent); }
.ai-mode-btn[data-mode="hints"] { color: var(--part2); }
.ai-mode-btn[data-mode="examiner"] { color: var(--part1); }
.ai-mode-menu {
  position: absolute; bottom: 52px; left: 16px; background: var(--surface);
  border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow-lg);
  padding: 6px; z-index: 30; min-width: 170px;
}
.ai-mode-menu button { display: flex; align-items: center; gap: 8px; width: 100%; border: none; background: transparent; color: var(--ink); font: inherit; font-size: .86rem; padding: 9px 12px; border-radius: 8px; cursor: pointer; text-align: left; }
.ai-mode-menu button:hover { background: var(--surface-2); }
.ai-plus-svg, .ai-ico-svg { display: block; flex: 0 0 auto; }
.ai-plus-menu button svg, .ai-mode-menu button svg { color: var(--ink-2); }
.ai-plus-menu button:hover svg, .ai-mode-menu button:hover svg { color: var(--accent); }

/* "Tap to change mode" hint with a drawn arrow */
.ai-mode-hint {
  position: absolute; bottom: 46px; left: 52px; z-index: 25;
  display: flex; align-items: center; gap: 6px;
  background: var(--surface); border: 1px solid var(--line-2); border-radius: 999px;
  box-shadow: var(--shadow-lg); padding: 6px 8px 6px 10px; max-width: 240px;
}
.ai-mode-hint-arrow { color: var(--accent); display: inline-flex; line-height: 0; order: 1; }
.ai-mode-hint-arrow-svg { display: block; }
.ai-mode-hint-text { font-size: .78rem; font-weight: 700; color: var(--ink); white-space: nowrap; order: 2; }
.ai-mode-hint-close {
  border: none; background: var(--surface-2); color: var(--ink-2);
  width: 20px; height: 20px; border-radius: 50%; font-size: .66rem; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center; flex: 0 0 auto; order: 3;
}
.ai-mode-hint-close:hover { background: var(--accent-2); color: var(--accent-ink); }

/* Credit confirmation modal */
.ai-confirm-overlay {
  position: fixed; inset: 0; z-index: 200; background: rgba(0,0,0,.45);
  display: flex; align-items: center; justify-content: center; padding: 20px;
}
.ai-confirm-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: 16px;
  box-shadow: var(--shadow-lg); padding: 22px; max-width: 360px; width: 100%;
  text-align: center;
}
.ai-confirm-ico {
  width: 48px; height: 48px; margin: 0 auto 12px; border-radius: 50%;
  background: var(--accent-3); color: var(--accent);
  display: inline-flex; align-items: center; justify-content: center;
}
.ai-confirm-card h3 { margin: 0 0 6px; font-size: 1.05rem; }
.ai-confirm-card p { margin: 0 0 18px; font-size: .88rem; color: var(--ink-2); line-height: 1.5; }
.ai-confirm-card p b { color: var(--accent-ink); }
.ai-confirm-actions { display: flex; gap: 10px; }
.ai-confirm-actions button {
  flex: 1; border: 1px solid var(--line-2); background: var(--surface); color: var(--ink);
  font: inherit; font-weight: 700; font-size: .86rem; padding: 10px 12px; border-radius: 10px; cursor: pointer;
}
.ai-confirm-actions .ai-confirm-cancel:hover { background: var(--surface-2); }
.ai-confirm-actions .ai-confirm-ok { background: var(--accent); border-color: var(--accent); color: #fff; }
.ai-confirm-actions .ai-confirm-ok:hover { background: var(--accent-ink); border-color: var(--accent-ink); }
.ai-send { width: 42px; height: 42px; border: none; border-radius: 50%; background: var(--accent); color: #fff; font-size: 1.1rem; cursor: pointer; flex-shrink: 0; display: inline-flex; align-items: center; justify-content: center; }
.ai-send:hover { background: var(--accent-ink); }
.ai-disclaimer { padding: 6px 16px 14px; text-align: center; font-size: .74rem; color: var(--ink-3); max-width: 820px; margin: 0 auto; }

@media (max-width: 720px) {
  .ai-head { padding: 10px 12px; }
  .ai-brand-name { font-size: 1.05rem; }
  .ai-modes { padding: 8px 10px; justify-content: flex-start; overflow-x: auto; scrollbar-width: none; }
  .ai-modes::-webkit-scrollbar { display: none; }
  .ai-msgs { padding: 14px 12px 6px; }
  .ai-suggestions { padding: 2px 12px 10px; }
  .ai-input-row { padding: 10px 12px 4px; }
  .ai-disclaimer { padding: 6px 12px 12px; }
  .ai-examiner { padding: 12px; }
  .ai-examiner-row { flex-direction: column; }
  .ai-msg.user { max-width: 88%; }
}

/* ── Spec view ────────────────────────────────────────────── */
.spec-aim {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px; margin-bottom: 14px; box-shadow: var(--shadow);
}
.spec-aim h3 { display: flex; align-items: center; gap: 10px; }
.spec-aim .sp-code { font-size: .8rem; background: var(--accent); color: #fff; border-radius: 8px; padding: 2px 9px; font-weight: 900; }
.spec-topic { margin: 12px 0 0; }
.spec-topic h4 { font-size: .98rem; margin-bottom: 6px; }
.spec-topic ul { margin: 0; padding-left: 18px; font-size: .9rem; color: var(--ink-2); }
.spec-topic li { margin-bottom: 3px; }
.spec-topic li button {
  border: none; background: none; color: var(--accent); font: inherit; cursor: pointer; padding: 0;
  text-decoration: underline; text-underline-offset: 2px;
}

/* ── Progress view ───────────────────────────────────────── */
.prog-mini-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px; margin-bottom: 18px;
}
.prog-mini-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: 12px;
  padding: 14px; text-align: center; box-shadow: var(--shadow);
}
.prog-mini-card .v { font-size: 1.3rem; font-weight: 900; color: var(--accent); }
.prog-mini-card .k { font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-2); margin-top: 2px; }
.prog-aim-accuracy {
  background: var(--surface); border: 1px solid var(--line); border-radius: 14px;
  padding: 16px; margin-bottom: 14px; box-shadow: var(--shadow);
}
.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: var(--surface-2); overflow: hidden; }
.prog-aim-row .bar > span { display: block; height: 100%; }
.prog-aim-row .bar.good > span { background: var(--ok); }
.prog-aim-row .bar.mid > span { background: var(--warn); }
.prog-aim-row .bar.bad > span { background: var(--bad); }
.prog-empty {
  background: var(--surface); border: 1px dashed var(--line-2); border-radius: 12px;
  padding: 18px; color: var(--ink-2); text-align: center; box-shadow: var(--shadow);
}

/* ── Footer ───────────────────────────────────────────────── */
.footer { border-top: 1px solid var(--line); padding: 22px 20px 34px; text-align: center; }
.footer p { font-size: .82rem; color: var(--ink-3); margin: 3px 0; }

/* ── Print ────────────────────────────────────────────────── */
@media print {
  .topbar, .tab { display: none !important; }
  .guide-sidebar, .guide-topbar, .guide-mark-btn { display: none !important; }
  .guide-shell { display: block; }
  .guide-topic-body { display: block !important; }
  body { background: #fff; }
  .wrap { max-width: none; padding: 0; }
}

/* ── Small screens ────────────────────────────────────────── */
@media (max-width: 768px) {
  .topbar { flex-wrap: wrap; gap: 8px; padding: 8px 10px; height: auto; }
  .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: 10px; padding: 4px 8px; }
  .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; }
  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; }
}
@media (max-width: 620px) {
  .site-unit-nav { display: none; }
  .tabs { order: 10; width: 100%; justify-content: flex-start; overflow-x: auto; flex-wrap: nowrap; padding-bottom: 4px; }
  .tab { white-space: nowrap; }
  .part-hero { padding: 24px 18px; }
  .section-block { padding: 16px; }

  /* Breathing room on phones — narrower side padding so cards feel less squished */
  .wrap { padding: 18px 14px 48px; }
  .section-head { margin: 2px 0 14px; }
  .section-head h2 { font-size: 1.5rem; }
  .assign-card { padding: 14px; }
  .assign-what, .assign-grades, .assign-chck, .assign-steps, .assign-bref { padding-left: 14px; padding-right: 14px; }
  .ai-chat { min-height: 440px; max-height: none; }
  .ai-chat, .ai-mark { border-radius: 12px; }
  .ai-upload-inner small { font-size: .7rem; }
}

/* ════════════════════════════════════════════════════════════
   Unit 4 — SQL Lab
   ════════════════════════════════════════════════════════════ */
.sql-shell { display: flex; flex-direction: column; gap: 14px; }
.sql-top { display: flex; flex-direction: column; gap: 12px; }
.sql-schema { display: flex; flex-wrap: wrap; gap: 8px; }
.sql-table-chip {
  display: flex; flex-direction: column; gap: 2px;
  background: var(--surface); border: 1px solid var(--line); border-radius: 10px;
  padding: 8px 12px; box-shadow: var(--shadow);
}
.sql-table-chip b { font-size: .88rem; color: var(--part1); }
.sql-table-chip span { font-size: .72rem; color: var(--ink-3); font-family: var(--mono); line-height: 1.4; }
.sql-samples { display: flex; flex-wrap: wrap; gap: 7px; align-items: center; }
.sql-samples-label { font-size: .76rem; font-weight: 800; color: var(--ink-3); text-transform: uppercase; letter-spacing: .05em; margin-right: 4px; }
.sql-sample {
  border: 1px solid var(--line-2); background: var(--surface); color: var(--ink-2);
  font: inherit; font-size: .78rem; font-weight: 700; padding: 6px 11px; border-radius: 999px; cursor: pointer;
  transition: all .12s;
}
.sql-sample:hover { border-color: var(--accent); color: var(--accent-ink); background: var(--accent-3); }
.sql-editor-wrap {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); overflow: hidden;
}
.sql-editor-wrap textarea {
  width: 100%; min-height: 92px; border: none; outline: none; resize: vertical;
  background: #0f1115; color: #d6e2f0; font-family: var(--mono); font-size: .9rem;
  padding: 14px; line-height: 1.6;
}
.sql-editor-actions { display: flex; gap: 8px; padding: 10px 14px; border-top: 1px solid var(--line); }
.sql-output { min-height: 80px; }
.sql-result-table { width: 100%; border-collapse: collapse; font-size: .86rem; background: var(--surface); border-radius: 10px; overflow: hidden; box-shadow: var(--shadow); }
.sql-result-table th { background: var(--part1-2); color: var(--part1); text-align: left; padding: 8px 12px; font-size: .8rem; }
.sql-result-table td { padding: 7px 12px; border-top: 1px solid var(--line); color: var(--ink-2); font-family: var(--mono); font-size: .82rem; }
.sql-result-msg { background: var(--ok-2); color: var(--ok); border: 1px solid var(--ok); border-radius: 10px; padding: 10px 14px; font-size: .88rem; font-weight: 700; }
.sql-result-empty { background: var(--surface-2); color: var(--ink-3); border-radius: 10px; padding: 14px; font-size: .88rem; }
.sql-result-error { background: var(--bad-2); color: var(--bad); border: 1px solid var(--bad); border-radius: 10px; padding: 10px 14px; font-size: .88rem; font-weight: 700; }

/* ════════════════════════════════════════════════════════════
   Unit 4 — Normalisation Lab
   ════════════════════════════════════════════════════════════ */
.nl-shell { display: flex; flex-direction: column; gap: 20px; }
.nl-intro {
  background: linear-gradient(135deg, var(--accent-3), var(--surface));
  border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px;
}
.nl-intro h3 { margin: 0 0 6px; }
.nl-intro p { margin: 0 0 10px; color: var(--ink-2); }
.nl-mnemonic {
  display: inline-block; background: var(--accent-2); color: var(--accent-ink);
  padding: 8px 14px; border-radius: 999px; font-size: .84rem; font-weight: 800;
}
.nl-example {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px 20px; box-shadow: var(--shadow);
}
.nl-example-hd h3 { margin: 0 0 4px; }
.nl-example-hd p { margin: 0 0 14px; color: var(--ink-2); font-size: .9rem; }
.nl-unf { margin-bottom: 16px; }
.nl-unf-label { font-size: .74rem; font-weight: 800; text-transform: uppercase; letter-spacing: .05em; color: var(--bad); margin-bottom: 8px; }
.nl-note { font-size: .82rem; color: var(--warn); background: var(--warn-2); border-radius: 8px; padding: 8px 12px; margin: 10px 0 0; }
.nl-table { overflow-x: auto; }
.nl-table table { width: 100%; border-collapse: collapse; font-size: .82rem; }
.nl-table th { background: var(--surface-2); color: var(--ink-2); text-align: left; padding: 7px 11px; font-size: .78rem; }
.nl-table td { padding: 6px 11px; border-top: 1px solid var(--line); color: var(--ink-2); font-family: var(--mono); font-size: .8rem; }
.nl-steps { display: flex; flex-direction: column; gap: 12px; }
.nl-step { border: 1px dashed var(--line-2); border-radius: 10px; padding: 12px 14px; }
.nl-step-badge {
  display: inline-block; background: var(--part1); color: #fff; font-size: .74rem; font-weight: 900;
  padding: 3px 12px; border-radius: 999px; margin-bottom: 6px;
}
.nl-rule { font-size: .88rem; color: var(--ink-2); margin: 0 0 12px; }
.nl-tables { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 10px; }
.nl-mini { border: 1px solid var(--line); border-radius: 9px; background: var(--surface-2); padding: 10px 12px; }
.nl-mini-head { display: flex; justify-content: space-between; align-items: center; gap: 8px; margin-bottom: 6px; }
.nl-mini-head b { font-size: .86rem; color: var(--part1); }
.nl-key { font-size: .72rem; color: var(--ink-3); font-weight: 700; }
.nl-mini-cols { display: flex; flex-wrap: wrap; gap: 5px; }
.nl-mini-cols span { background: var(--surface); border: 1px solid var(--line-2); border-radius: 6px; padding: 2px 8px; font-size: .74rem; font-family: var(--mono); color: var(--ink-2); }

/* ════════════════════════════════════════════════════════════
   Unit 4 — Microsoft Access Tutorials
   ════════════════════════════════════════════════════════════ */
.acc-shell { max-width: 860px; }
.acc-intro {
  background: linear-gradient(135deg, var(--part1-2), var(--surface));
  border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; margin-bottom: 16px;
}
.acc-intro h3 { margin: 0 0 6px; }
.acc-intro p { margin: 0; color: var(--ink-2); }
.acc-modules { display: flex; flex-direction: column; gap: 10px; }
.acc-module { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.acc-module-hd {
  display: flex; align-items: center; gap: 12px; width: 100%;
  border: none; background: var(--surface-2); font: inherit; text-align: left;
  padding: 14px 18px; cursor: pointer;
}
.acc-module-hd:hover { background: var(--accent-3); }
.acc-module-num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; border-radius: 8px; background: var(--part1); color: #fff;
  font-weight: 900; font-size: .82rem; flex: 0 0 auto;
}
.acc-module-ico { font-size: 1.3rem; flex: 0 0 auto; }
.acc-module-title { flex: 1; font-weight: 800; font-size: .98rem; color: var(--ink); }
.acc-cherr { transition: transform .18s; font-size: .8rem; color: var(--ink-3); }
.acc-module.open .acc-cherr { transform: rotate(180deg); }
.acc-body { display: none; padding: 4px 18px 16px; }
.acc-module.open .acc-body { display: block; }
.acc-module-intro { color: var(--ink-2); font-size: .9rem; margin: 12px 0; }
.acc-section h4 { font-size: .84rem; text-transform: uppercase; letter-spacing: .05em; color: var(--accent-ink); margin: 16px 0 8px; }
.acc-steps { margin: 0; padding-left: 20px; }
.acc-steps li { font-size: .9rem; color: var(--ink-2); line-height: 1.6; margin-bottom: 7px; }
.acc-steps code { background: var(--surface-2); border: 1px solid var(--line-2); padding: 1px 7px; border-radius: 5px; font-family: var(--mono); font-size: .82em; }
.acc-steps b { color: var(--ink); }

/* ════════════════════════════════════════════════════════════
   Unit 4 — Access Lab (fake Microsoft Access simulator)
   ════════════════════════════════════════════════════════════ */
.sim-window {
  display: flex; flex-direction: column;
  border: 1px solid var(--line-2); border-radius: 12px; overflow: hidden;
  background: var(--surface); box-shadow: var(--shadow-lg);
  min-height: 620px;
}
.sim-titlebar {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 14px; background: #2d3138; color: #e6edf3;
}
.sim-app-icon { font-size: 1rem; line-height: 1; }
.sim-app-title { font-weight: 700; font-size: .86rem; flex: 1; }
.sim-titlebar-btns { display: flex; gap: 8px; }
.sim-titlebar-btns i { font-style: normal; font-size: .8rem; color: #9aa4b2; cursor: default; }
.sim-titlebar-btns i:last-child:hover { color: #ff6b61; }

.sim-ribbon { background: #f4f5f7; border-bottom: 1px solid var(--line-2); }
[data-theme="dark"] .sim-ribbon { background: #26292f; }
.sim-ribbon-tabs { display: flex; gap: 2px; padding: 4px 8px 0; }
.sim-ribbon-tab {
  border: none; background: transparent; color: var(--ink-2); font: inherit; font-weight: 700; font-size: .82rem;
  padding: 6px 14px; cursor: pointer; border-radius: 6px 6px 0 0;
}
.sim-ribbon-tab:hover { background: var(--surface); color: var(--ink); }
.sim-ribbon-tab.active { background: var(--surface); color: var(--accent-ink); box-shadow: 0 -2px 0 var(--accent) inset; }
.sim-ribbon-groups { display: flex; flex-wrap: wrap; gap: 12px; padding: 8px 12px 10px; align-items: flex-start; }
.sim-ribbon-group { display: flex; flex-direction: column; gap: 2px; align-items: center; }
.sim-ribbon-group-name { font-size: .62rem; color: var(--ink-3); text-transform: uppercase; letter-spacing: .04em; }
.sim-ribbon-btns { display: flex; gap: 4px; }
.sim-ribbon-btn {
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  border: 1px solid transparent; background: transparent; color: var(--ink-2);
  font: inherit; font-size: .72rem; font-weight: 600; padding: 6px 10px; border-radius: 8px; cursor: pointer; min-width: 64px;
}
.sim-ribbon-btn:hover { background: #eef0f3; border-color: var(--line-2); color: var(--ink); }
[data-theme="dark"] .sim-ribbon-btn:hover { background: #31343b; }
.sim-ribbon-btn span:first-child { font-size: 1.15rem; line-height: 1; }

.sim-body { display: flex; flex: 1; min-height: 420px; }
.sim-nav { width: 220px; flex-shrink: 0; border-right: 1px solid var(--line); background: var(--surface-2); overflow-y: auto; }
[data-theme="dark"] .sim-nav { background: #1f2329; }
.sim-nav-hd { font-size: .78rem; font-weight: 800; padding: 10px 12px; color: var(--ink-2); }
.sim-nav-list { padding: 0 6px 14px; }
.sim-nav-group { margin-bottom: 8px; }
.sim-nav-group-hd { font-size: .68rem; font-weight: 800; text-transform: uppercase; letter-spacing: .05em; color: var(--ink-3); padding: 6px 8px 3px; }
.sim-nav-empty { font-size: .72rem; color: var(--ink-3); padding: 2px 10px; font-style: italic; }
.sim-nav-item {
  display: flex; align-items: center; gap: 8px; width: 100%;
  border: none; background: transparent; color: var(--ink-2); font: inherit; font-size: .82rem; font-weight: 600;
  padding: 6px 10px; border-radius: 7px; cursor: pointer; text-align: left;
}
.sim-nav-item:hover { background: var(--surface); color: var(--ink); }
.sim-nav-item.active { background: var(--accent-2); color: var(--accent-ink); }
.sim-nav-ic { font-size: .9rem; line-height: 1; }

.sim-work { flex: 1; padding: 18px; overflow: auto; position: relative; }

/* Home */
.sim-home { max-width: 720px; margin: 0 auto; }
.sim-home-h { font-size: 1.25rem; margin-bottom: 4px; }
.sim-home p { color: var(--ink-2); }
.sim-home-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; margin: 16px 0; }
.sim-home-card {
  display: flex; flex-direction: column; align-items: flex-start; gap: 4px;
  border: 1px solid var(--line-2); background: var(--surface); border-radius: 12px;
  padding: 14px; cursor: pointer; font: inherit; text-align: left; transition: border-color .12s, transform .1s;
}
.sim-home-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.sim-home-card-ic { font-size: 1.5rem; line-height: 1; }
.sim-home-card-t { font-weight: 800; font-size: .9rem; color: var(--ink); }
.sim-home-card-s { font-size: .75rem; color: var(--ink-3); }
.sim-home-sub { font-weight: 800; font-size: .9rem; margin-bottom: 8px; color: var(--ink-2); }
.sim-home-tpl-row { display: flex; gap: 8px; flex-wrap: wrap; }
.sim-home-progress { background: var(--ok-2); border: 1px solid var(--ok); color: var(--ok); border-radius: 10px; padding: 10px 14px; font-size: .84rem; margin: 4px 0 14px; }
.sim-home-card-ic { font-size: 1.1rem; font-weight: 900; color: var(--accent); line-height: 1; }

/* Generic pane */
.sim-pane { display: flex; flex-direction: column; gap: 12px; }
.sim-pane-hd { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; font-weight: 800; font-size: .95rem; }
.sim-pane-hd > span { flex: 1; min-width: 180px; }
.btn-small { padding: 6px 12px; font-size: .78rem; }
.btn-ghost { background: transparent; border-color: var(--line-2); color: var(--ink-2); }
.btn-ghost:hover { background: var(--surface-2); color: var(--ink); }

/* Table Design View */
.sim-design-grid { width: 100%; border-collapse: collapse; font-size: .86rem; }
.sim-design-grid th { text-align: left; background: var(--surface-2); padding: 8px 10px; font-size: .74rem; text-transform: uppercase; letter-spacing: .04em; color: var(--ink-2); border-bottom: 1px solid var(--line-2); }
.sim-design-grid td { padding: 5px 6px; border-bottom: 1px solid var(--line); }
.sim-design-grid tr.selected td { background: var(--accent-3); }
.sim-cell {
  width: 100%; border: 1px solid var(--line-2); border-radius: 6px; background: var(--surface);
  color: var(--ink); font: inherit; font-size: .84rem; padding: 6px 8px;
}
.sim-cell:focus { outline: none; border-color: var(--accent); }
.pk-col { width: 44px; text-align: center; }
.sim-pk { width: 16px; height: 16px; cursor: pointer; accent-color: var(--accent); }
.sim-del-field {
  border: none; background: transparent; color: var(--ink-3); cursor: pointer;
  width: 26px; height: 26px; border-radius: 6px; font-size: .85rem;
}
.sim-del-field:hover { background: var(--bad-2); color: var(--bad); }
.sim-field-props { border: 1px solid var(--line); border-radius: 10px; padding: 14px; background: var(--surface-2); }
.sim-props-hd { font-size: .84rem; margin-bottom: 4px; }
.sim-props-hint { font-size: .75rem; color: var(--ink-3); margin-bottom: 10px; }
.sim-props-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; }
.sim-props-grid label { display: flex; flex-direction: column; gap: 3px; font-size: .74rem; font-weight: 700; color: var(--ink-2); }
.sim-props-empty { font-size: .82rem; color: var(--ink-3); font-style: italic; }

/* Datasheet */
.sim-datasheet-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 10px; }
.sim-datasheet { width: 100%; border-collapse: collapse; font-size: .84rem; }
.sim-datasheet th { background: var(--surface-2); text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line-2); font-size: .74rem; color: var(--ink-2); white-space: nowrap; }
.sim-datasheet td { padding: 4px 6px; border-bottom: 1px solid var(--line); }
.sim-datasheet td input { border: 1px solid transparent; background: transparent; }
.sim-datasheet td input:hover, .sim-datasheet td input:focus { border-color: var(--line-2); background: var(--surface); }
.sim-new-row input::placeholder { color: var(--ink-3); font-style: italic; }
.sim-ds-foot { font-size: .74rem; }

/* Relationships */
.sim-rel-help { font-size: .82rem; color: var(--ink-2); background: var(--accent-3); border: 1px solid var(--accent-2); border-radius: 10px; padding: 10px 14px; }
.sim-rel-canvas { position: relative; min-height: 360px; border: 1px dashed var(--line-2); border-radius: 12px; background: var(--surface-2); padding: 20px; display: flex; flex-wrap: wrap; gap: 24px; align-content: flex-start; }
.sim-rel-empty { width: 100%; text-align: center; color: var(--ink-3); font-style: italic; padding: 40px 0; }
.sim-rel-box { background: var(--surface); border: 1px solid var(--line-2); border-radius: 10px; min-width: 170px; box-shadow: var(--shadow); position: relative; z-index: 1; }
.sim-rel-box-hd { background: var(--accent); color: #fff; font-weight: 800; font-size: .84rem; padding: 8px 12px; border-radius: 10px 10px 0 0; }
.sim-rel-field { padding: 7px 12px; font-size: .82rem; cursor: pointer; border-top: 1px solid var(--line); color: var(--ink-2); display: flex; gap: 6px; align-items: center; }
.sim-rel-field.pk { font-weight: 800; color: var(--accent-ink); }
.sim-rel-field.sel { background: var(--accent); color: #fff; }
.sim-rel-field.sel.pk { background: var(--accent-ink); color: #fff; }
.sim-rel-field:hover { background: var(--accent-3); }
.sim-rel-field.sel:hover { background: var(--accent); }
.sim-rel-lines { position: absolute; inset: 0; }
.sim-check { display: flex; align-items: center; gap: 8px; font-size: .86rem; color: var(--ink-2); cursor: pointer; }
.sim-check input { width: 16px; height: 16px; accent-color: var(--accent); }

/* Query Design */
.sim-qd-tables { display: flex; flex-wrap: wrap; gap: 10px; }
.sim-qd-table-box { background: var(--surface); border: 1px solid var(--line-2); border-radius: 8px; min-width: 140px; box-shadow: var(--shadow); }
.sim-qd-tb-hd { background: var(--part1); color: #fff; font-weight: 800; font-size: .8rem; padding: 6px 10px; border-radius: 8px 8px 0 0; }
.sim-qd-tf { padding: 5px 10px; font-size: .8rem; border-top: 1px solid var(--line); color: var(--ink-2); }
.sim-qd-tf.pk { font-weight: 800; color: var(--part1); }
.sim-qd-grid-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 10px; }
.sim-qd-grid { width: 100%; border-collapse: collapse; font-size: .84rem; min-width: 560px; }
.sim-qd-grid th { background: var(--surface-2); text-align: left; padding: 8px 10px; font-size: .72rem; text-transform: uppercase; letter-spacing: .04em; color: var(--ink-2); border-bottom: 1px solid var(--line-2); }
.sim-qd-grid td { padding: 5px 6px; border-bottom: 1px solid var(--line); }
.sim-qd-add-row { display: flex; gap: 8px; align-items: center; }
.sim-qd-add-row select { max-width: 240px; }

/* Result error */
.sim-error { background: var(--bad-2); color: var(--bad); border: 1px solid var(--bad); border-radius: 10px; padding: 12px 14px; font-weight: 700; font-size: .86rem; }

/* Form */
.sim-form { max-width: 460px; border: 1px solid var(--line); border-radius: 12px; padding: 18px; background: var(--surface); box-shadow: var(--shadow); display: flex; flex-direction: column; gap: 12px; }
.sim-form-title { font-weight: 900; font-size: 1.05rem; color: var(--part1); }
.sim-form-field { display: flex; flex-direction: column; gap: 3px; font-size: .8rem; font-weight: 700; color: var(--ink-2); }
.sim-form-actions { display: flex; justify-content: flex-end; margin-top: 4px; }

/* Report */
.sim-report { border: 1px solid var(--line); border-radius: 12px; padding: 24px; background: var(--surface); box-shadow: var(--shadow); }
.sim-report-h { font-weight: 900; font-size: 1.15rem; color: var(--accent-ink); text-align: center; }
.sim-report-sub { text-align: center; font-size: .76rem; color: var(--ink-3); margin: 2px 0 14px; }
.sim-report-table { width: 100%; border-collapse: collapse; font-size: .84rem; }
.sim-report-table th { background: var(--surface-2); text-align: left; padding: 8px 10px; border: 1px solid var(--line-2); font-size: .74rem; color: var(--ink-2); }
.sim-report-table td { padding: 6px 10px; border: 1px solid var(--line); }
@media print { .sim-window, .sim-ribbon, .sim-nav, .sim-titlebar, .sim-statusbar { display: none !important; } .sim-work { padding: 0; } }

/* Status bar */
.sim-statusbar { background: #2d3138; color: #b8c2cf; font-size: .74rem; padding: 5px 14px; }

/* Wizards & modals */
.sim-wiz { display: flex; flex-direction: column; gap: 10px; }
.sim-wiz-q { margin: 0; font-weight: 700; font-size: .92rem; }
.sim-wiz-tables { display: flex; flex-direction: column; gap: 6px; max-height: 180px; overflow-y: auto; }
.sim-wiz-lbl { display: flex; flex-direction: column; gap: 3px; font-size: .8rem; font-weight: 700; color: var(--ink-2); }
.sim-wiz-actions { display: flex; gap: 8px; justify-content: flex-end; margin-top: 6px; }
.sim-modal-overlay { position: fixed !important; inset: 0 !important; z-index: 200000 !important; background: rgba(10,6,8,.55); display: flex; align-items: center; justify-content: center; padding: 20px; }
body.ra10-refresh-enabled .sim-modal-overlay { position: fixed !important; z-index: 200000 !important; }
.sim-modal { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow-lg); width: 100%; max-width: 440px; overflow: hidden; }
.sim-modal-hd { display: flex; align-items: center; justify-content: space-between; padding: 12px 16px; border-bottom: 1px solid var(--line); font-weight: 800; font-size: .95rem; }
.sim-modal-x { border: none; background: transparent; color: var(--ink-3); cursor: pointer; font-size: 1rem; width: 28px; height: 28px; border-radius: 6px; }
.sim-modal-x:hover { background: var(--bad-2); color: var(--bad); }
.sim-modal-bd { padding: 16px; }