/* Emma's Time-Turner — shared styles (hub + 錯題本) */
:root {
  --bg: #F3F4F7;
  --card: #FFFFFF;
  --ink: #1F2430;
  --muted: #5C6475;
  --line: #DCE0E7;
  --navy: #243B63;
  --navy-soft: #E3E9F4;
  --navy-ink: #FFFFFF;
  --gold: #A97A22;
  --gold-soft: #F6EEDC;
  --good: #2E7D4F;
  --good-soft: #E0F0E6;
  --bad: #B3452F;
  --bad-soft: #F7E1DB;
  --radius: 16px;
  --max: 600px;
  --serif: "Noto Serif TC", "Songti TC", "PMingLiU", serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  --brand: "Cormorant Garamond", Georgia, "Times New Roman", serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161B;
    --card: #1D2027;
    --ink: #E9EBF0;
    --muted: #A3A9B6;
    --line: #2E323B;
    --navy: #9DB6E3;
    --navy-soft: #243047;
    --navy-ink: #111722;
    --gold: #D9AE55;
    --gold-soft: #33291A;
    --good: #7CC79A;
    --good-soft: #1F3327;
    --bad: #E58B75;
    --bad-soft: #3A2420;
  }
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--sans); font-size: 17px; line-height: 1.6; }
a { color: var(--navy); }
.app { max-width: var(--max); margin: 0 auto; padding: 16px 16px 48px; }
.screen[hidden], [hidden] { display: none !important; }

/* brand */
.wordmark { display: flex; align-items: center; gap: 12px; }
.wordmark svg { width: 46px; height: 46px; flex: none; }
.wordmark b { display: block; font-family: var(--brand); font-style: italic; font-weight: 600; font-size: 32px; line-height: 1; letter-spacing: .01em; }
.wordmark span { display: block; color: var(--muted); font-size: 14px; margin-top: 4px; }
.crumb { font-size: 15px; margin: 4px 0 8px; }
.crumb a { text-decoration: none; font-family: var(--brand); font-style: italic; font-size: 19px; font-weight: 600; }

.page-head { padding: 14px 0 16px; }
.eyebrow { margin: 0; color: var(--gold); font-size: 14px; font-weight: 700; letter-spacing: .12em; }
.page-head h1 { margin: 4px 0 2px; font-family: var(--serif); font-size: clamp(26px, 7vw, 34px); line-height: 1.25; text-wrap: balance; }
.sub { margin: 0; color: var(--muted); }

.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }

/* form */
.field { display: block; border: 0; padding: 0; margin: 0 0 16px; }
.field > span, .field legend { display: block; font-weight: 600; margin-bottom: 6px; }
select { width: 100%; font: inherit; color: inherit; background: var(--bg); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chips label { cursor: pointer; }
.chips input { position: absolute; opacity: 0; pointer-events: none; }
.chips span { display: inline-block; padding: 8px 16px; border-radius: 999px; border: 1px solid var(--line); background: var(--bg); }
.chips input:checked + span { background: var(--navy); color: var(--navy-ink); border-color: var(--navy); }
.chips input:focus-visible + span { outline: 2px solid var(--gold); outline-offset: 2px; }
.info { color: var(--muted); font-size: 15px; min-height: 1.6em; margin: 4px 0 12px; }
.source { color: var(--muted); font-size: 13px; text-align: center; margin: 14px 8px 0; }

.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin: 0 0 16px; }
.stat { background: var(--bg); border-radius: 12px; padding: 8px 10px; text-align: center; }
.stat b { display: block; font-size: 24px; line-height: 1.2; font-variant-numeric: tabular-nums; }
.stat span { font-size: 13px; color: var(--muted); }
.stat.star b { color: var(--gold); }
.stat.good b { color: var(--good); }
.stat.todo b { color: var(--bad); }

/* buttons */
.btn { font: inherit; font-weight: 600; border-radius: 12px; border: 1px solid var(--line); background: var(--bg); color: var(--ink);
       padding: 12px 18px; cursor: pointer; width: 100%; }
.btn.primary { background: var(--navy); color: var(--navy-ink); border-color: var(--navy); }
.btn.ghost { background: transparent; }
.btn.small { width: auto; padding: 6px 12px; font-size: 15px; }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn:focus-visible, .option:focus-visible { outline: 2px solid var(--gold); outline-offset: 2px; }
.actions { display: grid; gap: 10px; }

/* quiz */
.topbar { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.lesson-name { flex: 1; text-align: center; color: var(--muted); font-size: 15px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.score { font-weight: 700; color: var(--navy); font-variant-numeric: tabular-nums; }
.progress { height: 6px; background: var(--line); border-radius: 999px; overflow: hidden; margin-bottom: 14px; }
#progress-bar { height: 100%; width: 0; background: linear-gradient(90deg, var(--navy), var(--gold)); transition: width .3s; }
@media (prefers-reduced-motion: reduce) { #progress-bar { transition: none; } }

.q-type { margin: 0; font-size: 14px; color: var(--navy); font-weight: 700; letter-spacing: .06em; }
.q-type .starred { color: var(--gold); margin-left: 6px; }
.q-body { margin: 8px 0 16px; }
.q-big { font-family: var(--serif); font-size: clamp(26px, 7.5vw, 36px); letter-spacing: .06em; line-height: 1.5; margin: 0; }
.q-sentence { font-family: var(--serif); font-size: 21px; line-height: 1.8; margin: 0; }
.q-ask { color: var(--muted); margin: 6px 0 0; font-size: 16px; }
mark { background: var(--gold-soft); color: inherit; border-radius: 6px; padding: 0 3px; }
.blank-line { display: inline-block; min-width: 3.2em; border-bottom: 2px solid var(--gold); margin: 0 4px; vertical-align: -2px; }
.print-sheet .blank-line { border-bottom-color: #1F2430; min-width: 4em; }

.options { display: grid; gap: 10px; }
.options.grid2 { grid-template-columns: 1fr 1fr; }
.option { font: inherit; text-align: left; padding: 14px 16px; border-radius: 12px; border: 2px solid var(--line); background: var(--bg); color: var(--ink); cursor: pointer; }
.options.grid2 .option { text-align: center; font-size: 26px; font-family: var(--serif); }
.option:hover:not(:disabled) { border-color: var(--navy); }
.option.correct { border-color: var(--good); background: var(--good-soft); }
.option.wrong { border-color: var(--bad); background: var(--bad-soft); }
.option:disabled { cursor: default; }
.option .letter { font-weight: 700; color: var(--muted); margin-right: 6px; }

.reveal { border: 2px dashed var(--line); border-radius: 12px; padding: 14px 16px; text-align: center; }
.reveal .answer { font-family: var(--serif); font-size: 28px; margin: 0 0 10px; }
.selfcheck { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }

.feedback { margin: 14px 0; padding: 12px 14px; border-radius: 12px; background: var(--navy-soft); }
.feedback b { display: block; margin-bottom: 2px; }
.feedback.good b { color: var(--good); }
.feedback.bad b { color: var(--bad); }
.feedback p { margin: 4px 0 0; }
.feedback .tip { border-top: 1px dashed var(--line); padding-top: 6px; margin-top: 8px; font-size: 15px; }

.result { text-align: center; }
.big-score { font-size: 56px; font-weight: 800; margin: 4px 0; color: var(--navy); font-variant-numeric: tabular-nums; }
.comment { margin: 0 0 16px; }
#result-review { text-align: left; margin-bottom: 16px; }
.review-item { border-top: 1px dashed var(--line); padding: 10px 0; }
.review-item:first-child { border-top: 0; }
.review-item .w { font-family: var(--serif); font-size: 20px; }
.review-item p { margin: 2px 0 0; font-size: 15px; color: var(--muted); }

/* hub */
.hub-head { padding: 22px 0 18px; display: grid; gap: 10px; }
.hub-head p { margin: 0; color: var(--muted); }
.subject { margin-top: 18px; }
.subject h2 { font-family: var(--serif); font-size: 22px; margin: 0 0 10px; display: flex; align-items: baseline; gap: 10px; }
.subject h2 small { font-family: var(--sans); font-size: 14px; color: var(--muted); font-weight: 400; }
.modules { display: grid; gap: 12px; }
.module { display: grid; grid-template-columns: 1fr auto; gap: 4px 12px; align-items: center; text-decoration: none; color: inherit; }
.module:hover { border-color: var(--navy); }
.module h3 { margin: 0; font-size: 19px; }
.module p { margin: 0; color: var(--muted); font-size: 15px; grid-column: 1; }
.module .go { grid-row: 1 / span 2; grid-column: 2; font-size: 22px; color: var(--navy); }
.pill { display: inline-block; font-size: 13px; font-weight: 700; border-radius: 999px; padding: 1px 10px; margin-left: 8px; vertical-align: 2px; }
.pill.todo { background: var(--bad-soft); color: var(--bad); }
.pill.done { background: var(--good-soft); color: var(--good); }
.later { display: flex; flex-wrap: wrap; gap: 8px; }
.later span { border: 1px dashed var(--line); color: var(--muted); border-radius: 999px; padding: 4px 14px; font-size: 15px; }
.foot { color: var(--muted); font-size: 13px; text-align: center; margin-top: 28px; }

/* printable sheet (錯題本 → 輸出列印版) */
.print-bar { position: sticky; top: 0; z-index: 2; display: flex; gap: 10px; align-items: center; background: var(--bg); padding: 8px 0; }
.print-bar .info { flex: 1; margin: 0; font-size: 14px; }
.print-sheet { background: #fff; color: #1F2430; border-radius: 12px; padding: 22px 22px 28px; font-family: var(--serif); font-size: 15.5px; }
.ps-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 12px; border-bottom: 1.5px solid #1F2430; padding-bottom: 8px; }
.ps-head b { font-family: var(--brand); font-style: italic; font-size: 22px; }
.ps-head span { font-family: var(--sans); font-size: 12px; color: #5C6475; }
.ps-title { font-size: 22px; font-weight: 700; margin: 10px 0 4px; }
.ps-meta { font-family: var(--sans); font-size: 12.5px; color: #5C6475; display: flex; gap: 16px; flex-wrap: wrap; }
.ps-meta i { font-style: normal; display: inline-block; min-width: 60px; border-bottom: 1px solid #1F2430; }
.ps-sec { font-family: var(--sans); font-weight: 700; font-size: 15px; border-bottom: 1px solid #CFD4DC; margin: 16px 0 6px; padding-bottom: 3px; }
.ps-item { display: grid; grid-template-columns: 30px 1fr; gap: 6px; padding: 5px 0; break-inside: avoid; }
.ps-item .n { font-family: var(--sans); font-size: 12.5px; color: #5C6475; padding-top: 2px; }
.ps-item .line { display: inline-block; min-width: 96px; border-bottom: 1px solid #1F2430; margin-left: 8px; }
.ps-opts { display: flex; flex-wrap: wrap; gap: 2px 18px; font-size: 14.5px; }
.ps-star { color: #A97A22; }
.print-sheet mark { background: #F6EEDC; color: #1F2430; }
.ps-key { break-before: page; }
.ps-key .ps-item { padding: 3px 0; font-size: 14px; }

@media print {
  @page { size: A4; margin: 13mm 14mm; }
  body { background: #fff; }
  .app { max-width: none; padding: 0; }
  .no-print, .print-bar, .crumb { display: none !important; }
  .print-sheet { border-radius: 0; padding: 0; }
}