/* ============================================================
   Aural Trainer — HSC Music 1 revision
   Laptop-first. No webfonts (offline PWA). Light default,
   dark via prefers-color-scheme.
   ============================================================ */

:root {
  /* ink + surfaces */
  --bg: oklch(0.98 0.004 270);
  --surface: oklch(1 0 0);
  --surface-2: oklch(0.955 0.006 270);
  --ink: oklch(0.24 0.02 280);
  --ink-2: oklch(0.42 0.02 280);
  --line: oklch(0.88 0.008 270);
  --accent: oklch(0.44 0.15 288);
  --accent-ink: oklch(0.98 0.005 288);
  --ok: oklch(0.55 0.14 150);
  --bad: oklch(0.55 0.18 25);
  --ok-tint: oklch(0.94 0.045 150);
  --bad-tint: oklch(0.94 0.04 25);

  /* concept hues */
  --c-duration: oklch(0.52 0.15 30);
  --c-pitch: oklch(0.5 0.13 255);
  --c-dynamics: oklch(0.52 0.16 340);
  --c-tone-colour: oklch(0.5 0.12 165);
  --c-texture: oklch(0.55 0.12 75);
  --c-structure: oklch(0.47 0.14 300);
  --c-duration-tint: oklch(0.95 0.025 30);
  --c-pitch-tint: oklch(0.95 0.02 255);
  --c-dynamics-tint: oklch(0.95 0.025 340);
  --c-tone-colour-tint: oklch(0.95 0.02 165);
  --c-texture-tint: oklch(0.95 0.025 75);
  --c-structure-tint: oklch(0.95 0.02 300);

  --serif: "Iowan Old Style", "Palatino Nova", Palatino, "Book Antiqua", Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  --radius: 10px;
  --shadow: 0 1px 2px oklch(0.2 0.02 280 / 0.06), 0 4px 16px oklch(0.2 0.02 280 / 0.05);

  /* z scale */
  --z-sticky: 10;
  --z-toast: 40;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: oklch(0.19 0.015 280);
    --surface: oklch(0.235 0.015 280);
    --surface-2: oklch(0.27 0.015 280);
    --ink: oklch(0.93 0.008 280);
    --ink-2: oklch(0.72 0.015 280);
    --line: oklch(0.33 0.015 280);
    --accent: oklch(0.74 0.12 288);
    --accent-ink: oklch(0.17 0.03 288);
    --ok: oklch(0.75 0.13 150);
    --bad: oklch(0.72 0.16 25);
    --ok-tint: oklch(0.3 0.05 150);
    --bad-tint: oklch(0.3 0.05 25);
    --c-duration: oklch(0.72 0.13 35);
    --c-pitch: oklch(0.72 0.11 255);
    --c-dynamics: oklch(0.74 0.13 340);
    --c-tone-colour: oklch(0.74 0.11 165);
    --c-texture: oklch(0.76 0.11 80);
    --c-structure: oklch(0.72 0.12 300);
    --c-duration-tint: oklch(0.28 0.035 35);
    --c-pitch-tint: oklch(0.28 0.03 255);
    --c-dynamics-tint: oklch(0.28 0.035 340);
    --c-tone-colour-tint: oklch(0.28 0.03 165);
    --c-texture-tint: oklch(0.28 0.035 80);
    --c-structure-tint: oklch(0.28 0.03 300);
    --shadow: 0 1px 2px oklch(0 0 0 / 0.3), 0 4px 16px oklch(0 0 0 / 0.25);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--bg);
}

h1, h2, h3 { font-family: var(--serif); line-height: 1.15; text-wrap: balance; margin: 0 0 0.4em; font-weight: 600; }
h1 { font-size: clamp(1.7rem, 3.5vw, 2.4rem); letter-spacing: -0.015em; }
h2 { font-size: 1.45rem; }
h3 { font-size: 1.12rem; }
p { margin: 0 0 1em; max-width: 70ch; text-wrap: pretty; }
a { color: var(--accent); }
ul { padding-left: 1.2em; }
li { margin-bottom: 0.35em; }
button { font: inherit; cursor: pointer; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: var(--z-sticky);
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  padding: 0 clamp(16px, 4vw, 40px);
  display: flex; align-items: center; gap: 20px;
  height: 58px;
}
.brand {
  font-family: var(--serif); font-size: 1.2rem; font-weight: 700;
  color: var(--ink); text-decoration: none; letter-spacing: -0.01em;
  display: flex; align-items: center; gap: 9px;
}
.brand svg { flex: none; }
.site-nav { display: flex; gap: 4px; margin-left: 8px; }
.site-nav a {
  text-decoration: none; color: var(--ink-2); padding: 6px 12px;
  border-radius: 999px; font-size: 0.95rem;
}
.site-nav a.active { background: var(--surface-2); color: var(--ink); font-weight: 600; }
.site-nav a:hover { color: var(--ink); }
.student-chip {
  margin-left: auto; border: 1px solid var(--line); background: none;
  border-radius: 999px; padding: 5px 14px; color: var(--ink);
  font-size: 0.9rem;
}
.student-chip:hover { background: var(--surface-2); }
.student-chip .cls { color: var(--ink-2); }

main { padding: clamp(20px, 4vw, 44px) clamp(16px, 4vw, 40px) 80px; max-width: 1060px; margin: 0 auto; }

/* ---------- home ---------- */
.home-head { display: flex; align-items: end; justify-content: space-between; gap: 24px; flex-wrap: wrap; margin-bottom: 30px; }
.home-head p { color: var(--ink-2); margin: 0; }

.quiz-launch { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  border: 1px solid var(--line); background: var(--surface);
  color: var(--ink); border-radius: var(--radius);
  padding: 10px 18px; font-weight: 600; text-decoration: none; font-size: 0.98rem;
  transition: background 150ms cubic-bezier(0.22, 1, 0.36, 1), transform 150ms cubic-bezier(0.22, 1, 0.36, 1);
}
.btn:hover { background: var(--surface-2); }
.btn:active { transform: scale(0.985); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.primary:hover { filter: brightness(1.08); }
.btn.small { padding: 6px 13px; font-size: 0.9rem; font-weight: 600; }

.section-label { font-family: var(--serif); font-size: 1.3rem; margin: 38px 0 14px; }

.concept-list { list-style: none; padding: 0; margin: 0; border-top: 1px solid var(--line); }
.concept-row {
  display: grid; grid-template-columns: 14px 1fr auto auto; align-items: center; gap: 18px;
  padding: 15px 6px; border-bottom: 1px solid var(--line); margin: 0;
  text-decoration: none; color: inherit;
  transition: background 130ms ease-out;
}
.concept-row:hover { background: var(--surface); }
.concept-dot { width: 14px; height: 14px; border-radius: 4px; background: var(--chue, var(--accent)); }
.concept-row .names b { font-family: var(--serif); font-size: 1.1rem; font-weight: 600; display: block; }
.concept-row .names span { color: var(--ink-2); font-size: 0.92rem; }
.concept-row .stat { color: var(--ink-2); font-size: 0.88rem; text-align: right; white-space: nowrap; font-variant-numeric: tabular-nums; }
.concept-row .stat b { color: var(--ink); font-weight: 600; }
.acc-meter { width: 90px; height: 6px; border-radius: 999px; background: var(--surface-2); overflow: hidden; border: 1px solid var(--line); }
.acc-meter i { display: block; height: 100%; background: var(--chue, var(--accent)); }

.exam-facts { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 24px; margin-top: 38px; }
.exam-facts ul { margin: 0; }

/* ---------- identity form ---------- */
.identity-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 26px 28px; max-width: 460px; margin: 6vh auto 0;
}
.identity-card label { display: block; font-weight: 600; font-size: 0.92rem; margin: 14px 0 4px; }
.identity-card input {
  width: 100%; font: inherit; padding: 9px 12px; border-radius: 8px;
  border: 1px solid var(--line); background: var(--bg); color: var(--ink);
}
.identity-card .actions { margin-top: 20px; display: flex; gap: 10px; }
.field-hint { color: var(--ink-2); font-size: 0.85rem; margin-top: 3px; }

/* ---------- concept page ---------- */
.concept-hero { border-bottom: 3px solid var(--chue, var(--accent)); padding-bottom: 18px; margin-bottom: 26px; }
.concept-hero .kicker-row { display: flex; align-items: center; gap: 10px; margin-bottom: 6px; }
.concept-hero .concept-dot { width: 16px; height: 16px; }
.concept-hero .tagline { color: var(--ink-2); font-size: 1.05rem; margin: 0; }
.concept-actions { display: flex; gap: 10px; margin: 16px 0 0; flex-wrap: wrap; }

.concept-grid { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); gap: 40px; align-items: start; }
@media (max-width: 820px) { .concept-grid { grid-template-columns: 1fr; } }

.listen-list li::marker { color: var(--chue, var(--accent)); }

.term-table { border-top: 1px solid var(--line); }
.term-item { padding: 11px 2px; border-bottom: 1px solid var(--line); }
.term-item b { font-weight: 650; }
.term-item .def { color: var(--ink); }
.term-item .eg { color: var(--ink-2); font-style: italic; font-size: 0.92rem; margin-top: 2px; }

.starters { background: var(--ctint, var(--surface-2)); border-radius: var(--radius); padding: 18px 22px; }
.starters ul { margin: 0; }
.starters li { font-style: italic; }

.scaffold-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 20px 24px; margin: 10px 0 22px;
}
.scaffold-card ol { padding-left: 0; list-style: none; margin: 12px 0; counter-reset: none; }
.scaffold-card ol li { display: grid; grid-template-columns: 74px 1fr; gap: 12px; margin-bottom: 8px; }
.scaffold-card ol b { color: var(--accent); font-weight: 700; }
.scaffold-model { background: var(--surface-2); border-radius: 8px; padding: 12px 16px; font-style: italic; font-size: 0.95rem; }
.scaffold-tip { color: var(--ink-2); font-size: 0.92rem; margin: 10px 0 0; }

.stem-list li { font-style: italic; }
.listening-item { padding: 10px 0; border-bottom: 1px solid var(--line); }
.listening-item b { display: block; }
.listening-item span { color: var(--ink-2); font-size: 0.93rem; }
.listening-item a { font-size: 0.9rem; }

/* ---------- quiz ---------- */
.quiz-wrap { max-width: 700px; margin: 0 auto; }
.quiz-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; color: var(--ink-2); font-size: 0.92rem; }
.quiz-progress { flex: 1; height: 6px; background: var(--surface-2); border: 1px solid var(--line); border-radius: 999px; margin: 0 16px; overflow: hidden; }
.quiz-progress i { display: block; height: 100%; background: var(--accent); transition: width 300ms cubic-bezier(0.22, 1, 0.36, 1); }

.q-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: 14px;
  box-shadow: var(--shadow); padding: 30px 34px; margin-top: 14px;
}
.q-type { color: var(--ink-2); font-size: 0.88rem; margin-bottom: 10px; }
.q-prompt { font-family: var(--serif); font-size: 1.35rem; line-height: 1.3; margin-bottom: 22px; text-wrap: balance; }
.q-prompt .quoted { color: var(--accent); }

.opts { display: grid; gap: 10px; }
.opt {
  text-align: left; border: 1px solid var(--line); background: var(--bg);
  border-radius: 10px; padding: 12px 16px; color: var(--ink); line-height: 1.4;
  display: grid; grid-template-columns: 26px 1fr; gap: 12px; align-items: baseline;
  transition: border-color 120ms ease-out, background 120ms ease-out;
}
.opt:hover:not(:disabled) { border-color: var(--accent); }
.opt kbd {
  font: 600 0.8rem var(--sans); color: var(--ink-2); border: 1px solid var(--line);
  border-radius: 5px; text-align: center; padding: 1px 0; align-self: center;
}
.opt.correct { background: var(--ok-tint); border-color: var(--ok); }
.opt.wrong { background: var(--bad-tint); border-color: var(--bad); }
.opt:disabled { cursor: default; }
.opt.dim { opacity: 0.55; }

.q-feedback { margin-top: 18px; display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 42px; }
.q-feedback .verdict { font-weight: 700; }
.q-feedback .verdict.good { color: var(--ok); }
.q-feedback .verdict.badv { color: var(--bad); }
.q-feedback .detail { color: var(--ink-2); font-size: 0.93rem; }

/* match question */
.match-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 22px; }
.match-cols .col { display: grid; gap: 10px; align-content: start; }
.match-cols .opt { grid-template-columns: 1fr; }
.opt.selected { border-color: var(--accent); background: var(--surface-2); }
.opt.paired { border-style: solid; }
.pair-tag {
  display: inline-block; font-size: 0.75rem; font-weight: 700; color: var(--accent);
  margin-right: 6px;
}
@media (max-width: 640px) { .match-cols { grid-template-columns: 1fr; } }

/* flashcards */
.flashcard {
  background: var(--surface); border: 1px solid var(--line); border-radius: 14px;
  box-shadow: var(--shadow); padding: 44px 36px; min-height: 240px;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; cursor: pointer; margin-top: 14px;
}
.flashcard .fc-term { font-family: var(--serif); font-size: 1.9rem; font-weight: 600; }
.flashcard .fc-def { font-size: 1.1rem; max-width: 46ch; }
.flashcard .fc-eg { color: var(--ink-2); font-style: italic; margin-top: 12px; max-width: 50ch; }
.flashcard .fc-hint { color: var(--ink-2); font-size: 0.88rem; margin-top: 18px; }
.fc-actions { display: flex; gap: 12px; justify-content: center; margin-top: 18px; }
.btn.again { border-color: var(--bad); color: var(--bad); }
.btn.got { border-color: var(--ok); color: var(--ok); }
.fc-concept-tag { font-size: 0.85rem; font-weight: 600; color: var(--chue, var(--ink-2)); margin-bottom: 14px; }

/* results screen */
.score-line { font-family: var(--serif); font-size: 2rem; margin: 4px 0 2px; }
.result-summary { text-align: center; padding: 10px 0 4px; }
.result-summary .sub { color: var(--ink-2); }
.missed-list { margin-top: 22px; }
.missed-list .term-item b { color: var(--bad); }
.try-scaffold { background: var(--surface-2); border-radius: var(--radius); padding: 16px 20px; margin-top: 22px; font-size: 0.95rem; }
.result-actions { display: flex; gap: 10px; justify-content: center; margin-top: 26px; }

/* ---------- my results ---------- */
.results-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 40px; align-items: start; }
@media (max-width: 820px) { .results-grid { grid-template-columns: 1fr; } }
.acc-row { display: grid; grid-template-columns: 190px 1fr 52px; gap: 12px; align-items: center; padding: 7px 0; font-size: 0.95rem; }
.acc-row .acc-meter { width: 100%; }
.acc-row .pct { text-align: right; font-variant-numeric: tabular-nums; color: var(--ink-2); }
.attempt-table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
.attempt-table th { text-align: left; color: var(--ink-2); font-weight: 600; padding: 6px 10px 6px 0; border-bottom: 1px solid var(--line); }
.attempt-table td { padding: 7px 10px 7px 0; border-bottom: 1px solid var(--line); font-variant-numeric: tabular-nums; }
.empty-note { color: var(--ink-2); }
.sync-note { color: var(--ink-2); font-size: 0.85rem; margin-top: 18px; }

/* ---------- toast ---------- */
.toast {
  position: fixed; bottom: 22px; left: 50%; translate: -50% 0; z-index: var(--z-toast);
  background: var(--ink); color: var(--bg); border-radius: 999px; padding: 9px 20px;
  font-size: 0.92rem; box-shadow: var(--shadow); opacity: 0;
  transition: opacity 250ms ease-out;
}
.toast.show { opacity: 1; }

/* ---------- view transitions ---------- */
.view-enter { animation: viewIn 260ms cubic-bezier(0.22, 1, 0.36, 1); }
@keyframes viewIn { from { opacity: 0.01; transform: translateY(6px); } to { opacity: 1; transform: none; } }

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

/* ---------- phone adjustments (secondary) ---------- */
@media (max-width: 640px) {
  .site-header { height: auto; padding-top: 8px; padding-bottom: 8px; flex-wrap: wrap; gap: 8px; }
  .concept-row { grid-template-columns: 12px 1fr auto; }
  .concept-row .stat.terms { display: none; }
  .q-card { padding: 22px 18px; }
  .flashcard { padding: 30px 20px; }
}