/* ============================================================
   ArthaRoshni — CBSE Economics 10–12
   Design system + layout. Mobile-first, offline PWA.
   ============================================================ */

:root {
  /* Brand palette */
  --bg: #f8fafc;
  --bg-elev: #ffffff;
  --ink: #0a1b3b;
  --ink-soft: #475569;
  --ink-faint: #94a3b8;
  --line: #e6e8ef;
  --line-soft: #eef0f6;

  --primary: #1f3a63;
  --primary-ink: #ffffff;
  --primary-soft: #e0e8f4;
  --accent: #c78800;
  --accent-soft: #fdf3d8;
  --gold: #c78800;
  --gold-soft: #fdf3d8;
  --danger: #dc2626;
  --danger-soft: #fde3e3;
  --ok: #16a34a;
  --ok-soft: #dcfce7;

  --c10: #2c4f84;
  --c11: #0f766e;
  --c12: #be123c;

  --shadow-sm: 0 1px 2px rgba(15, 23, 42, .06);
  --shadow: 0 6px 20px rgba(15, 23, 42, .08);
  --shadow-lg: 0 18px 40px rgba(15, 23, 42, .14);

  --radius: 16px;
  --radius-sm: 12px;
  --radius-lg: 22px;

  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --maxw: 780px;
  --nav-h: 64px;
}

/* Dark auto-theme removed — the CFI-style redesign is light-first, with
   its own dark sections (hero, platform band, footer) baked in. */

* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
img { max-width: 100%; }

/* Boot */
.boot { min-height: 100vh; display: grid; place-content: center; gap: 14px; text-align: center; color: var(--ink-faint); }
.boot__logo {
  width: 66px; height: 66px; border-radius: 20px; margin: 0 auto;
  display: grid; place-content: center; font-size: 34px; font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff;
}

/* Static content crawlers read before js/app.js replaces #app. Users see it for
   only a moment, so it is styled as a readable summary rather than a bare dump. */
.prerender {
  max-width: 70ch; margin: 0 auto; padding: 48px 20px 64px;
  color: var(--ink-soft); font-size: 15px; line-height: 1.65;
}
.prerender h1 { font-size: 26px; color: var(--ink); margin: 18px 0 12px; line-height: 1.25; }
.prerender h2 { font-size: 18px; color: var(--ink); margin: 26px 0 8px; }
.prerender p { margin-bottom: 12px; }
.prerender ul { margin: 0 0 12px 20px; }
.prerender li { margin-bottom: 8px; }
.prerender a { color: var(--primary); font-weight: 600; }
.prerender strong { color: var(--ink); }
.prerender__boot { margin-top: 24px; font-size: 13px; color: var(--ink-faint); }

/* App shell */
.app { max-width: var(--maxw); margin: 0 auto; min-height: 100vh; padding-bottom: calc(var(--nav-h) + env(safe-area-inset-bottom) + 12px); }

/* Top bar */
.topbar {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; gap: 12px;
  padding: calc(env(safe-area-inset-top) + 12px) 16px 12px;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--line-soft);
}
.topbar__back {
  width: 38px; height: 38px; border-radius: 12px; flex: none;
  display: grid; place-content: center; font-size: 20px;
  background: var(--bg-elev); border: 1px solid var(--line); box-shadow: var(--shadow-sm);
}
.topbar__title { font-weight: 750; font-size: 17px; line-height: 1.2; }
.topbar__title small { display: block; font-weight: 500; color: var(--ink-faint); font-size: 12px; }
.topbar__spacer { flex: 1; }
.topbar__action {
  width: 38px; height: 38px; border-radius: 12px; flex: none;
  display: grid; place-content: center; font-size: 18px;
  background: var(--bg-elev); border: 1px solid var(--line); box-shadow: var(--shadow-sm);
}
.topbar__action.is-active { color: var(--gold); border-color: var(--gold); }

.page { padding: 18px 16px 8px; animation: fade .25s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* Hero (home) */
.hero {
  border-radius: var(--radius-lg); padding: 22px 20px; color: #fff; position: relative; overflow: hidden;
  background: radial-gradient(120% 140% at 0% 0%, #2563eb 0%, #1e3a8a 45%, #0d9488 120%);
  box-shadow: var(--shadow);
}
.hero h1 { font-size: 24px; line-height: 1.15; letter-spacing: -.4px; }
.hero p { margin-top: 8px; opacity: .9; font-size: 14px; max-width: 40ch; }
.hero__badge { display: inline-flex; gap: 6px; align-items: center; font-size: 12px; font-weight: 600; background: rgba(255,255,255,.18); padding: 5px 11px; border-radius: 999px; margin-bottom: 12px; }
.hero__stats { display: flex; gap: 18px; margin-top: 16px; }
.hero__stat b { font-size: 20px; display: block; }
.hero__stat span { font-size: 11px; opacity: .85; text-transform: uppercase; letter-spacing: .06em; }
.hero__glow { position: absolute; right: -40px; top: -40px; font-size: 180px; opacity: .12; font-weight: 800; }

.section-title { font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--ink-faint); margin: 26px 4px 12px; display: flex; align-items: center; gap: 8px; }

/* Class cards */
.class-grid { display: grid; gap: 14px; }
.class-card {
  display: flex; align-items: center; gap: 16px; padding: 16px;
  background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow-sm); transition: transform .15s, box-shadow .15s;
}
.class-card:active { transform: scale(.985); }
.class-card__badge {
  width: 58px; height: 58px; border-radius: 16px; flex: none; color: #fff;
  display: grid; place-content: center; font-weight: 800; font-size: 13px; text-align: center; line-height: 1.1;
}
.class-card__badge b { font-size: 22px; display: block; }
.class-card__body { flex: 1; min-width: 0; }
.class-card__body h3 { font-size: 16px; }
.class-card__body p { font-size: 13px; color: var(--ink-soft); margin-top: 2px; }
.class-card__meta { font-size: 12px; color: var(--ink-faint); margin-top: 6px; display: flex; gap: 12px; flex-wrap: wrap; }
.class-card__chev { color: var(--ink-faint); font-size: 22px; }

/* Progress bar */
.pbar { height: 6px; border-radius: 99px; background: var(--line); overflow: hidden; margin-top: 8px; }
.pbar > i { display: block; height: 100%; border-radius: 99px; background: linear-gradient(90deg, var(--primary), var(--accent)); }

/* Subject / chapter list */
.subject-block { margin-bottom: 22px; }
.subject-head { display: flex; align-items: center; gap: 10px; margin: 0 4px 10px; }
.subject-head .dot { width: 10px; height: 10px; border-radius: 3px; flex: none; }
.subject-head h2 { font-size: 16px; }
.subject-head small { color: var(--ink-faint); font-size: 12px; }

.chapter-row {
  display: flex; align-items: center; gap: 14px; padding: 14px 16px;
  background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm); margin-bottom: 10px; transition: transform .15s;
}
.chapter-row:active { transform: scale(.99); }
.chapter-row__num { width: 34px; height: 34px; border-radius: 10px; flex: none; display: grid; place-content: center; font-weight: 700; font-size: 14px; background: var(--primary-soft); color: var(--primary); }
.chapter-row.done .chapter-row__num { background: var(--ok-soft); color: var(--ok); }
.chapter-row__body { flex: 1; min-width: 0; }
.chapter-row__body h4 { font-size: 15px; line-height: 1.25; }
.chapter-row__body p { font-size: 12px; color: var(--ink-faint); margin-top: 3px; display: flex; gap: 10px; flex-wrap: wrap; }
.chapter-row__chev { color: var(--ink-faint); font-size: 20px; }
.tag { font-size: 10.5px; font-weight: 700; padding: 2px 8px; border-radius: 999px; text-transform: uppercase; letter-spacing: .04em; }
.tag--soon { background: var(--gold-soft); color: var(--gold); }
.tag--ready { background: var(--ok-soft); color: var(--ok); }

/* Chapter reader */
.reader-head { margin-bottom: 6px; }
.reader-head .kicker { font-size: 12px; font-weight: 700; color: var(--primary); text-transform: uppercase; letter-spacing: .08em; }
.reader-head h1 { font-size: 25px; line-height: 1.15; letter-spacing: -.4px; margin: 6px 0 8px; }
.reader-head .lead { color: var(--ink-soft); font-size: 15px; }
.reader-meta { display: flex; gap: 8px; flex-wrap: wrap; margin: 14px 0 6px; }
.chip { font-size: 12px; font-weight: 600; padding: 6px 11px; border-radius: 999px; background: var(--bg-elev); border: 1px solid var(--line); color: var(--ink-soft); display: inline-flex; gap: 6px; align-items: center; }

/* Lesson jump nav */
.lesson-nav { display: flex; gap: 8px; overflow-x: auto; padding: 4px 0 8px; margin: 8px -16px 4px; padding-left: 16px; padding-right: 16px; scrollbar-width: none; }
.lesson-nav::-webkit-scrollbar { display: none; }
.lesson-nav a { flex: none; font-size: 13px; font-weight: 600; padding: 8px 14px; border-radius: 999px; background: var(--bg-elev); border: 1px solid var(--line); color: var(--ink-soft); white-space: nowrap; }
.lesson-nav a.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* Content blocks */
.lesson { padding-top: 10px; scroll-margin-top: 80px; }
.lesson__title { font-size: 20px; letter-spacing: -.3px; margin: 22px 0 8px; display: flex; align-items: baseline; gap: 8px; }
.lesson__title .idx { font-size: 13px; font-weight: 700; color: var(--accent); }
.block { margin: 12px 0; }
.block p { font-size: 15.5px; color: var(--ink); }
.block h3.sub { font-size: 17px; margin: 18px 0 6px; }
.block ul, .block ol { padding-left: 22px; font-size: 15px; }
.block li { margin: 6px 0; }
.block li::marker { color: var(--primary); }

.callout { border-radius: var(--radius-sm); padding: 14px 16px; border: 1px solid var(--line); background: var(--bg-elev); box-shadow: var(--shadow-sm); }
.callout--def { background: var(--primary-soft); border-color: color-mix(in srgb, var(--primary) 30%, transparent); }
.callout--tip { background: var(--accent-soft); border-color: color-mix(in srgb, var(--accent) 30%, transparent); }
.callout--warn { background: var(--gold-soft); border-color: color-mix(in srgb, var(--gold) 30%, transparent); }
.callout--exam { background: var(--danger-soft); border-color: color-mix(in srgb, var(--danger) 35%, transparent); }
.callout__label { font-size: 11px; font-weight: 800; text-transform: uppercase; letter-spacing: .08em; display: flex; align-items: center; gap: 6px; margin-bottom: 5px; }
.callout--def .callout__label { color: var(--primary); }
.callout--tip .callout__label { color: var(--accent); }
.callout--warn .callout__label { color: var(--gold); }
.callout--exam .callout__label { color: var(--danger); }
.callout p, .callout li { font-size: 14.5px; }

.formula { text-align: center; font-size: 18px; font-weight: 650; padding: 14px; border-radius: var(--radius-sm); background: var(--bg-elev); border: 1px dashed var(--line); font-family: "Cambria Math", Georgia, serif; }
.formula small { display: block; font-size: 12px; color: var(--ink-faint); font-weight: 500; margin-top: 6px; font-family: var(--font); }

/* Data table */
.tbl-wrap { overflow-x: auto; border-radius: var(--radius-sm); border: 1px solid var(--line); box-shadow: var(--shadow-sm); }
table.data { width: 100%; border-collapse: collapse; font-size: 14px; min-width: 340px; background: var(--bg-elev); }
table.data th, table.data td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--line-soft); }
table.data th { background: var(--primary-soft); color: var(--primary); font-size: 12.5px; text-transform: uppercase; letter-spacing: .04em; }
table.data tr:last-child td { border-bottom: none; }

/* Figure caption */
.figure { background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; box-shadow: var(--shadow-sm); margin: 14px 0; }
.figure__cap { font-size: 12.5px; color: var(--ink-faint); text-align: center; margin-top: 10px; }
.figure svg { display: block; width: 100%; height: auto; }

/* Flow diagram (connectors) */
.flow { display: flex; flex-direction: column; gap: 0; }
.flow__step { display: flex; gap: 12px; }
.flow__rail { display: flex; flex-direction: column; align-items: center; flex: none; }
.flow__node { width: 34px; height: 34px; border-radius: 50%; display: grid; place-content: center; font-weight: 700; font-size: 14px; color: #fff; background: var(--primary); box-shadow: 0 0 0 4px var(--primary-soft); flex: none; }
.flow__line { width: 2px; flex: 1; background: linear-gradient(var(--primary), var(--accent)); min-height: 18px; }
.flow__card { flex: 1; background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 12px 14px; margin-bottom: 12px; box-shadow: var(--shadow-sm); }
.flow__card h5 { font-size: 14.5px; }
.flow__card p { font-size: 13px; color: var(--ink-soft); margin-top: 3px; }

/* Key terms */
.terms { display: grid; gap: 8px; }
.term { background: var(--bg-elev); border: 1px solid var(--line); border-left: 3px solid var(--accent); border-radius: 10px; padding: 10px 13px; }
.term b { font-size: 14.5px; }
.term span { display: block; font-size: 13px; color: var(--ink-soft); margin-top: 2px; }

/* Q&A accordion */
.qa { background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius-sm); margin-bottom: 10px; overflow: hidden; box-shadow: var(--shadow-sm); }
.qa__q { display: flex; gap: 10px; align-items: flex-start; padding: 13px 15px; font-weight: 600; font-size: 14.5px; }
.qa__q .mk { font-size: 11px; font-weight: 700; color: var(--primary); background: var(--primary-soft); padding: 2px 7px; border-radius: 6px; flex: none; margin-top: 2px; }
.qa__q .arrow { margin-left: auto; color: var(--ink-faint); transition: transform .2s; flex: none; }
.qa.open .qa__q .arrow { transform: rotate(180deg); }
.qa__a { max-height: 0; overflow: hidden; transition: max-height .3s ease; }
.qa.open .qa__a { max-height: 1200px; }
.qa__a-inner { padding: 0 15px 14px; font-size: 14px; color: var(--ink-soft); border-top: 1px solid var(--line-soft); padding-top: 12px; }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; font-weight: 650; font-size: 15px; padding: 13px 18px; border-radius: 14px; background: var(--primary); color: #fff; box-shadow: var(--shadow-sm); width: 100%; transition: transform .12s; }
.btn:active { transform: scale(.98); }
.btn--ghost { background: var(--bg-elev); color: var(--ink); border: 1px solid var(--line); }
.btn--accent { background: var(--accent); }
.btn-row { display: flex; gap: 10px; margin: 18px 0; }

/* Quiz */
.quiz-intro { text-align: center; padding: 10px 0; }
.quiz-opt {
  display: flex; gap: 12px; align-items: center; width: 100%; text-align: left;
  padding: 15px 16px; border-radius: 14px; background: var(--bg-elev); border: 1.5px solid var(--line);
  margin-bottom: 11px; font-size: 15px; box-shadow: var(--shadow-sm); transition: border-color .15s, background .15s;
}
.quiz-opt .key { width: 28px; height: 28px; border-radius: 8px; flex: none; display: grid; place-content: center; font-weight: 700; font-size: 13px; background: var(--line); color: var(--ink-soft); }
.quiz-opt.correct { border-color: var(--ok); background: var(--ok-soft); }
.quiz-opt.correct .key { background: var(--ok); color: #fff; }
.quiz-opt.wrong { border-color: var(--danger); background: var(--danger-soft); }
.quiz-opt.wrong .key { background: var(--danger); color: #fff; }
.quiz-opt:disabled { cursor: default; }
.quiz-progress { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.quiz-progress .pbar { flex: 1; margin: 0; }
.quiz-count { font-size: 13px; font-weight: 700; color: var(--ink-soft); flex: none; }
.explain { margin-top: 6px; padding: 12px 14px; border-radius: 12px; background: var(--primary-soft); font-size: 14px; color: var(--ink); border: 1px solid color-mix(in srgb, var(--primary) 25%, transparent); }
.explain b { color: var(--primary); }
.scorecard { text-align: center; padding: 24px 10px; }
.scorecard .ring { width: 130px; height: 130px; margin: 0 auto 14px; }
.scorecard h2 { font-size: 22px; }
.pyq-badge { font-size: 10.5px; font-weight: 700; padding: 2px 8px; border-radius: 999px; background: var(--gold-soft); color: var(--gold); margin-left: 6px; }

/* Signup gate (500-Lab Catalogue) */
.signup-card { max-width: 540px; margin: 28px auto; background: var(--bg-elev); border: 1px solid var(--line); border-radius: 18px; padding: 30px 28px; box-shadow: var(--shadow-sm); }
.signup-card__head h2 { font-size: 22px; margin-bottom: 6px; }
.signup-card__head p { color: var(--ink-soft); font-size: 14.5px; margin-bottom: 20px; line-height: 1.55; }
.signup-form { display: grid; gap: 14px; }
.signup-form label { display: grid; gap: 6px; font-size: 13px; font-weight: 700; color: var(--ink-soft); }
.signup-form input, .signup-form select { padding: 11px 13px; border: 1.5px solid var(--line); border-radius: 10px; font: inherit; font-size: 14.5px; background: var(--bg); color: var(--ink); }
.signup-form input:focus, .signup-form select:focus { outline: 2px solid var(--primary); outline-offset: 1px; }
.signup-note { font-size: 12.5px; color: var(--ink-faint); text-align: center; margin-top: 2px; }

/* QBank mode toggle */
.qb-modes { display: flex; gap: 4px; background: var(--bg-elev); border: 1px solid var(--line); border-radius: 12px; padding: 4px; width: max-content; margin-bottom: 16px; box-shadow: var(--shadow-sm); }
.qb-mode { padding: 8px 16px; border-radius: 9px; font-size: 13.5px; font-weight: 700; color: var(--ink-soft); transition: background .15s, color .15s; }
.qb-mode.active { background: var(--primary); color: #fff; }
.qb-note { font-size: 12.5px; color: var(--ink-faint); margin: 2px 4px 0; }

/* QBank flashcard */
.qb-card { background: var(--bg-elev); border: 1.5px solid var(--line); border-radius: 18px; padding: 22px 20px; box-shadow: var(--shadow-sm); }
.qb-card__tag { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .05em; margin-bottom: 10px; }
.qb-card__q { font-size: 19px; font-weight: 700; line-height: 1.4; color: var(--ink); margin-bottom: 20px; }
.qb-card__a { background: var(--ok-soft); border: 1px solid color-mix(in srgb, var(--ok) 30%, transparent); border-radius: 14px; padding: 14px 16px; font-size: 16px; font-weight: 600; color: var(--ink); margin-bottom: 18px; animation: fade .2s ease; }
.qb-card__alabel { display: block; font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; color: var(--ok); margin-bottom: 4px; }
.qb-grade-row { display: flex; gap: 10px; }
.qb-grade-row .btn { width: auto; flex: 1; }

/* Search */
.search-box { display: flex; align-items: center; gap: 10px; background: var(--bg-elev); border: 1px solid var(--line); border-radius: 14px; padding: 12px 15px; box-shadow: var(--shadow-sm); }
.search-box input { flex: 1; border: none; outline: none; background: none; font-size: 16px; color: var(--ink); }
.search-result { padding: 13px 15px; background: var(--bg-elev); border: 1px solid var(--line); border-radius: 12px; margin-bottom: 9px; box-shadow: var(--shadow-sm); }
.search-result .path { font-size: 11.5px; color: var(--ink-faint); text-transform: uppercase; letter-spacing: .04em; }
.search-result h4 { font-size: 15px; margin-top: 3px; }
.search-result p { font-size: 13px; color: var(--ink-soft); margin-top: 3px; }
mark { background: var(--gold-soft); color: var(--gold); padding: 0 2px; border-radius: 3px; }

/* Empty state */
.empty { text-align: center; padding: 44px 20px; color: var(--ink-faint); }
.empty .ico { font-size: 44px; margin-bottom: 10px; }
.empty h3 { color: var(--ink-soft); font-size: 17px; }
.empty p { font-size: 14px; margin-top: 6px; }

/* Bottom nav */
.tabbar {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 50;
  display: flex; max-width: var(--maxw); margin: 0 auto;
  background: color-mix(in srgb, var(--bg-elev) 92%, transparent);
  backdrop-filter: saturate(160%) blur(14px);
  border-top: 1px solid var(--line);
  padding: 8px 8px calc(env(safe-area-inset-bottom) + 8px);
}
.tabbar a { flex: 1; display: flex; flex-direction: column; align-items: center; gap: 3px; font-size: 10.5px; font-weight: 600; color: var(--ink-faint); padding: 4px 0; border-radius: 12px; }
.tabbar a .ic { font-size: 20px; line-height: 1; }
.tabbar a.active { color: var(--primary); }

/* Install banner */
.install {
  position: fixed; left: 12px; right: 12px; bottom: calc(var(--nav-h) + 14px); z-index: 60;
  max-width: 520px; margin: 0 auto;
  background: var(--ink); color: #fff; border-radius: 16px; padding: 14px 16px;
  display: flex; align-items: center; gap: 12px; box-shadow: var(--shadow-lg);
  animation: fade .3s ease;
}
.install b { font-size: 14px; }
.install p { font-size: 12px; opacity: .8; }
.install .btn { width: auto; padding: 9px 14px; font-size: 13px; background: #fff; color: var(--ink); }
.install .x { font-size: 20px; opacity: .7; padding: 0 4px; }

/* ================= Technical Labs ================= */
.lab-grid { display: grid; gap: 12px; }
.lab-card { display: flex; gap: 14px; align-items: center; padding: 15px; background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow-sm); transition: transform .15s; }
.lab-card:active { transform: scale(.99); }
.lab-card__icon { width: 52px; height: 52px; border-radius: 14px; flex: none; display: grid; place-content: center; font-size: 26px; }
.lab-card__body { flex: 1; min-width: 0; }
.lab-card__body h3 { font-size: 16px; }
.lab-card__body p { font-size: 13px; color: var(--ink-soft); margin-top: 2px; }
.lab-card__meta { display: flex; gap: 8px; margin-top: 8px; flex-wrap: wrap; }
.chip--live { background: var(--accent-soft); color: var(--accent); border-color: color-mix(in srgb, var(--accent) 30%, transparent); }

.lab-tool { background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; box-shadow: var(--shadow-sm); }
.tool-hint { font-size: 13.5px; color: var(--ink-soft); margin-bottom: 10px; }
.tool-ta { width: 100%; border: 1px solid var(--line); border-radius: 12px; padding: 12px; font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace; font-size: 14px; background: var(--bg); color: var(--ink); resize: vertical; margin-bottom: 12px; }
.tool-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 12px; }
.tool-grid label { font-size: 12px; color: var(--ink-soft); display: flex; flex-direction: column; gap: 5px; }
.tool-in { border: 1px solid var(--line); border-radius: 10px; padding: 10px; font-size: 15px; background: var(--bg); color: var(--ink); }
.tool-slider { display: flex; align-items: center; gap: 10px; font-size: 13.5px; color: var(--ink-soft); margin: 10px 0; }
.tool-slider b { color: var(--primary); min-width: 42px; }
.tool-slider input[type=range] { flex: 1; accent-color: var(--primary); }
.tool-result { margin-top: 14px; }
.tool-note { font-size: 12.5px; color: var(--ink-soft); margin-top: 10px; line-height: 1.5; }
.stat { background: var(--bg); border: 1px solid var(--line); border-radius: 12px; padding: 11px 13px; }
.stat b { font-size: 18px; display: block; }
.stat span { font-size: 11.5px; color: var(--ink-faint); }
.stat-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(90px, 1fr)); gap: 9px; margin-top: 9px; }
.lab-res { display: grid; gap: 9px; }
.tok { font-size: 12px; font-weight: 600; padding: 1px 7px; border-radius: 6px; }
.tok--pos { background: var(--ok-soft); color: var(--ok); }
.tok--neg { background: var(--danger-soft); color: var(--danger); }
pre.code { background: #0b1120; color: #e2e8f0; border-radius: 12px; padding: 14px; overflow-x: auto; font-size: 13px; line-height: 1.6; border: 1px solid var(--line); }
pre.code code { font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace; white-space: pre; }

/* Catalogue filters + rows */
.fchip-row { display: flex; gap: 7px; overflow-x: auto; padding: 10px 0 4px; scrollbar-width: none; }
.fchip-row::-webkit-scrollbar { display: none; }
.fchip { flex: none; font-size: 12.5px; font-weight: 600; padding: 7px 13px; border-radius: 999px; background: var(--bg-elev); border: 1px solid var(--line); color: var(--ink-soft); white-space: nowrap; }
.fchip.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.cat-count { font-size: 12px; font-weight: 700; color: var(--ink-faint); text-transform: uppercase; letter-spacing: .06em; margin: 14px 4px 10px; }
.cat-row { display: flex; align-items: center; gap: 12px; padding: 12px 14px; background: var(--bg-elev); border: 1px solid var(--line); border-radius: 12px; margin-bottom: 8px; box-shadow: var(--shadow-sm); transition: transform .12s; }
.cat-row:active { transform: scale(.99); }
.cat-row__id { width: 40px; height: 40px; border-radius: 10px; flex: none; display: grid; place-content: center; font-weight: 800; font-size: 13px; }
.cat-row__body { flex: 1; min-width: 0; }
.cat-row__body h4 { font-size: 14.5px; line-height: 1.25; }
.cat-row__body p { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 6px; }
.cat-row__body .chip { font-size: 10.5px; padding: 3px 8px; }
.chip--diff-beginner { background: var(--ok-soft); color: var(--ok); border-color: transparent; }
.chip--diff-intermediate { background: var(--primary-soft); color: var(--primary); border-color: transparent; }
.chip--diff-advanced { background: var(--gold-soft); color: var(--gold); border-color: transparent; }

/* Utility */
.muted { color: var(--ink-faint); }
.center { text-align: center; }
.mt { margin-top: 16px; }
.divider { height: 1px; background: var(--line-soft); margin: 22px 0; }