:root {
  --paper: #f5efe2;
  --paper-deep: #ece3cf;
  --ink: #2b2620;
  --ink-soft: #5c5348;
  --cinnabar: #b3402a;
  --cinnabar-dark: #8e2f1d;
  --gold: #7c5f16;
  --green: #4a6b4f;
  --card: #fffdf7;
  --line: #d8cdb4;
  --shadow: 0 2px 10px rgba(60, 45, 20, .12);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 6.5rem;
  scroll-padding-bottom: calc(5.5rem + env(safe-area-inset-bottom));
}
body {
  font-family: "Noto Serif TC", "Songti TC", "PMingLiU", serif;
  background: var(--paper);
  background-image: radial-gradient(rgba(120, 95, 50, .05) 1px, transparent 1px);
  background-size: 22px 22px;
  color: var(--ink);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
button { font-family: inherit; color: inherit; cursor: pointer; }
button, select, input[type="search"] { min-height: 44px; }
:where(button, a, input, select, textarea, [tabindex]):focus-visible {
  outline: 3px solid #176b9b;
  outline-offset: 3px;
}
.battle-shell :where(button, [tabindex]):focus-visible { outline-color: #ffe5a3; }
.modal-open { overflow: hidden; }

/* ── 頂欄 ── */
.topbar { background: var(--card); border-bottom: 3px solid var(--cinnabar); box-shadow: var(--shadow); position: sticky; top: 0; z-index: 20; }
.brand { display: flex; align-items: baseline; gap: .6rem; padding: .7rem 1rem .3rem; flex-wrap: wrap; }
.seal {
  display: inline-flex; align-items: center; justify-content: center;
  width: 2.1rem; height: 2.1rem; border-radius: .35rem;
  background: var(--cinnabar); color: var(--paper);
  font-size: 1.35rem; font-weight: 700; align-self: center;
}
.brand h1 { font-size: 1.35rem; letter-spacing: .12em; }
.subtitle { color: var(--ink-soft); font-size: .85rem; }
.tabs {
  display: flex; overflow-x: auto; padding: 0 .5rem; gap: .15rem;
  overscroll-behavior-inline: contain; scrollbar-width: thin;
}
.tabs button {
  border: none; background: none; padding: .55rem .8rem; font-size: .95rem;
  color: var(--ink-soft); border-bottom: 3px solid transparent; white-space: nowrap;
}
.tabs button.active, .tabs button[aria-current="page"] { color: var(--cinnabar); border-bottom-color: var(--cinnabar); font-weight: 700; }
.tab-scroll-hint { display: none; }

main { flex: 1; width: 100%; max-width: 880px; margin: 0 auto; padding: 1rem 1rem calc(6rem + env(safe-area-inset-bottom)); }
.view { display: none; }
.view.active { display: block; animation: fadein .25s ease; }
@keyframes fadein { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; } }
.tools-discovery-note {
  margin: 0 0 .75rem; padding: .45rem .7rem; border: 1px dashed var(--line); border-radius: .5rem;
  color: var(--ink-soft); background: rgba(255, 253, 247, .78); font-size: .82rem; line-height: 1.5;
}
.storage-warning {
  margin: 0 0 .8rem;
  padding: .75rem .9rem;
  border: 2px solid #9c3b2e;
  border-radius: .65rem;
  background: #fff2ed;
  color: #711f17;
  font-weight: 700;
}
.storage-warning[hidden] { display: none; }
.parent-support {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: .7rem 1rem;
  margin: 0 0 .8rem;
  padding: .8rem .9rem;
  border: 1px solid #d8c8aa;
  border-radius: .7rem;
  background: rgba(255, 252, 244, .9);
  box-shadow: 0 2px 8px rgba(70, 49, 27, .06);
}
.parent-support[hidden], .tools-discovery-note[hidden] { display: none !important; }
.parent-support > div:first-child { display: grid; gap: .15rem; }
.parent-support > div:first-child span { color: var(--ink-soft); font-size: .86rem; }
.parent-guide-panel { grid-column: 1 / -1; border-top: 1px dashed #d8c8aa; padding-top: .85rem; }
.parent-guide-panel[hidden] { display: none; }
.parent-summary { display: flex; align-items: center; flex-wrap: wrap; gap: .4rem .8rem; }
.parent-summary h2 { width: 100%; margin: 0; font-size: 1.15rem; }
.parent-summary p { flex: 1 1 22rem; margin: .15rem 0; }
.parent-guide-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .65rem; margin-top: .8rem; }
.parent-guide-grid section { padding: .75rem; border-radius: .6rem; background: #f2ead8; }
.parent-guide-grid h3 { margin: 0 0 .35rem; color: var(--cinnabar-dark); font-size: 1rem; }
.parent-guide-grid p, .parent-guide-grid ol, .parent-guide-grid ul { margin: 0; padding-left: 1.2rem; }
.parent-guide-grid p { padding-left: 0; }
.parent-controls { display: flex; align-items: center; flex-wrap: wrap; gap: .45rem; margin-top: .8rem; }
.parent-controls [data-parent-timer-status] { color: var(--ink-soft); font-size: .85rem; }
html[data-reading-size="large"] { font-size: 112.5%; }
#danai-public-counter {
  right: max(14px, env(safe-area-inset-right)) !important;
  bottom: max(14px, env(safe-area-inset-bottom)) !important;
}

/* ── 通用卡片 ── */
.card { background: var(--card); border: 1px solid var(--line); border-radius: .7rem; box-shadow: var(--shadow); padding: 1.1rem 1.2rem; margin-bottom: 1rem; }
.card h2 { font-size: 1.15rem; color: var(--cinnabar-dark); margin-bottom: .6rem; letter-spacing: .08em; }
.card h3 { font-size: 1.02rem; margin: .8rem 0 .35rem; }
.card p { line-height: 1.85; margin-bottom: .5rem; }
.muted { color: var(--ink-soft); font-size: .88rem; }
.card details {
  margin: .7rem 0;
  border: 1px solid var(--line);
  border-radius: .55rem;
  background: #faf5e8;
}
.card details summary {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: .55rem .7rem;
  color: var(--cinnabar-dark);
  font-weight: 700;
  cursor: pointer;
}
.card details[open] summary { border-bottom: 1px dashed var(--line); }
.card details p { padding: .65rem .75rem; margin: 0; }
.evidence-block {
  margin: .8rem 0;
  padding: .7rem .8rem;
  border-left: 4px solid var(--gold);
  border-radius: .45rem;
  background: #f7f0df;
  text-align: left;
}
.evidence-block p { margin: 0 0 .35rem; line-height: 1.65; }
.evidence-block p:last-child { margin-bottom: 0; }
.evidence-scope { display: flex; flex-wrap: wrap; gap: .25rem .9rem; }
.evidence-note { font-size: .8rem; color: var(--ink-soft); }
.evidence-block.is-compact { font-size: .82rem; }
.pill {
  display: inline-block; padding: .1rem .55rem; border-radius: 99px;
  font-size: .8rem; border: 1px solid var(--line); background: var(--paper-deep); margin: 0 .15rem .2rem 0;
}
.pill.cat-象形 { background: #e8f0e4; border-color: #9fbc9a; color: #2f5233; }
.pill.cat-指事 { background: #e6ecf4; border-color: #93a9c8; color: #2c4568; }
.pill.cat-會意 { background: #f4ece0; border-color: #cfae7e; color: #6e4f1e; }
.pill.cat-形聲 { background: #f6e4e0; border-color: #d49a8c; color: #8e2f1d; }
.pill.cat-轉注 { background: #ece4f2; border-color: #ab93c4; color: #533670; }
.pill.cat-假借 { background: #e2f0ef; border-color: #8dbcb8; color: #1f5752; }
.pill.lv-基礎 { background: #e8f0e4; }
.pill.lv-進階 { background: #f4ece0; }
.pill.lv-挑戰 { background: #f6e4e0; }
.disputed-mark { color: var(--gold); font-size: .85rem; }

.btn {
  display: inline-block; border: none; border-radius: .5rem;
  padding: .6rem 1.3rem; font-size: 1rem; letter-spacing: .1em;
  background: var(--cinnabar); color: #fff; box-shadow: var(--shadow);
  transition: transform .1s;
}
.btn:active { transform: scale(.96); }
.btn.ghost { background: var(--card); color: var(--cinnabar); border: 1.5px solid var(--cinnabar); }
.btn.small { padding: .35rem .8rem; font-size: .88rem; }
.btn:disabled { opacity: .45; cursor: default; }
.btnrow { display: flex; gap: .6rem; flex-wrap: wrap; margin-top: .8rem; }

/* ── 今日主線 ── */
.eyebrow { color: var(--cinnabar-dark); font-size: .78rem; font-weight: 700; letter-spacing: .14em; text-transform: uppercase; }
.journey-hero { background: linear-gradient(145deg, #fffdf7 55%, #efe3c9); border-top: 4px solid var(--cinnabar); }
.journey-hero h2 { font-size: clamp(1.25rem, 4vw, 1.8rem); }
.journey-meter { height: .65rem; overflow: hidden; margin: .9rem 0 .45rem; border-radius: 99px; background: #ddd2bc; }
.journey-meter span { display: block; height: 100%; min-width: .25rem; border-radius: inherit; background: linear-gradient(90deg, var(--cinnabar), #d19b3f); }
.chapter-map { list-style: none; display: grid; gap: .45rem; padding: 0; }
.chapter-map button { display: grid; grid-template-columns: 2.4rem 1fr auto; align-items: center; gap: .65rem; width: 100%; padding: .55rem .7rem; border: 1px solid var(--line); border-radius: .55rem; background: #faf5e8; text-align: left; }
.chapter-map button > span { display: grid; place-items: center; width: 2rem; height: 2rem; border-radius: 50%; background: var(--paper-deep); color: var(--cinnabar-dark); font-weight: 700; }
.chapter-map small { color: var(--ink-soft); }
.chapter-map .is-current button { border: 2px solid var(--cinnabar); background: #fff8ed; }
.chapter-map .is-done button > span { background: var(--green); color: white; }
.week-dots { display: grid; grid-template-columns: repeat(7, 1fr); gap: .45rem; max-width: 24rem; }
.week-dots span { display: grid; place-items: center; min-height: 2rem; border-radius: .45rem; background: #e1d8c6; color: var(--ink-soft); }
.week-dots span.done { background: var(--green); }
.week-dots span.done small { color: white; }
.week-dots small { font-size: .72rem; font-weight: 700; }
.next-hook { padding: .7rem; border-left: 4px solid var(--gold); background: #faf2df; }

/* ── 概念導讀 ── */
.origin-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: .7rem; margin: .6rem 0; }
.origin-cell { border: 1px dashed var(--line); border-radius: .5rem; padding: .7rem; background: var(--paper-deep); }
.origin-cell b { display: block; margin-bottom: .3rem; }
.fyimark { display: inline-block; width: 1.5rem; text-align: center; }
.has { color: var(--green); font-weight: 700; }
.hasnot { color: var(--ink-soft); opacity: .6; }
.concept-toc { display: flex; flex-wrap: wrap; gap: .4rem; margin-bottom: .4rem; }
.example-chars { font-size: 1.5rem; letter-spacing: .35em; font-weight: 700; color: var(--cinnabar-dark); }
.concept-jump {
  position: sticky; top: 5.9rem; z-index: 10;
  display: flex; align-items: center; gap: .65rem; margin-bottom: .8rem; padding: .55rem .7rem;
  border: 1px solid var(--line); border-radius: .6rem; background: rgba(255, 253, 247, .96); box-shadow: var(--shadow);
}
.concept-jump strong { flex: 0 0 auto; color: var(--cinnabar-dark); font-size: .88rem; }
.concept-jump-links { display: flex; flex-wrap: wrap; gap: .25rem; }
.concept-jump a { margin: 0; text-decoration: none; }
[id^="concept-"] { scroll-margin-top: 10rem; }

/* ── 造字故事 ── */
.story-card h3 { color: var(--cinnabar-dark); margin-top: 1.3rem; letter-spacing: .06em; }
.story-card p { text-indent: 0; }
.story-chapter-nav { position: sticky; top: 5.9rem; z-index: 9; display: flex; gap: .35rem; overflow-x: auto; padding: .5rem; margin: .6rem 0 1rem; border: 1px solid var(--line); border-radius: .55rem; background: rgba(255, 253, 247, .96); }
.story-chapter-nav button { flex: 0 0 2.7rem; border: 1px solid var(--line); border-radius: 50%; background: var(--paper-deep); }
.story-chapter-nav button.active { background: var(--cinnabar); color: white; border-color: var(--cinnabar); font-weight: 700; }
.story-chapter[hidden] { display: none; }
.story-scene[hidden] { display: none; }
.story-chapter > h3 { font-size: 1.2rem; }
.story-order-warning { margin: .35rem 0 .8rem; padding: .5rem .65rem; border-left: 3px solid var(--gold); background: #faf2df; }
.story-scene-status { align-self: center; color: var(--ink-soft); font-weight: 700; }
.story-controls { justify-content: space-between; border-top: 1px dashed var(--line); padding-top: .9rem; }
.story-character-guide { margin-bottom: 1rem !important; }
.story-characters { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .7rem; margin: 1rem 0 1.2rem; }
.story-characters figure { overflow: hidden; border: 1px solid var(--line); border-radius: .65rem; background: var(--paper-deep); }
.story-characters img { display: block; width: 100%; height: auto; aspect-ratio: 4 / 5; object-fit: cover; }
.story-characters figcaption { display: grid; gap: .15rem; padding: .55rem .65rem; line-height: 1.35; }
.story-characters figcaption b { color: var(--cinnabar-dark); }
.story-characters figcaption span { color: var(--ink-soft); font-size: .78rem; }

/* ── 課堂共學 ── */
.prompt-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: .65rem; margin-top: .8rem; }
.prompt-card { display: grid; gap: .35rem; padding: .8rem; border: 1px solid var(--line); border-radius: .6rem; background: #faf5e8; text-align: left; }
.prompt-card b { color: var(--cinnabar-dark); }
.prompt-card span { color: var(--ink-soft); line-height: 1.5; }
.classroom-flow form { display: grid; gap: .85rem; }
.classroom-flow fieldset { display: flex; flex-wrap: wrap; gap: .5rem 1rem; padding: .75rem; border: 1px solid var(--line); border-radius: .55rem; }
.classroom-flow legend { padding: 0 .3rem; color: var(--cinnabar-dark); font-weight: 700; }
.classroom-flow label { min-height: 44px; display: inline-flex; align-items: center; gap: .35rem; }
.classroom-flow select { margin-left: .4rem; padding: .35rem; border: 1px solid var(--line); border-radius: .4rem; background: white; }
.evidence-wall { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: .45rem; margin: .7rem 0; }
.evidence-wall span { display: grid; gap: .1rem; padding: .55rem; border-radius: .5rem; background: var(--paper-deep); text-align: center; font-size: .82rem; }
.evidence-wall b { color: var(--cinnabar-dark); font-size: 1.2rem; }
.answer-shift { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .7rem; }
.answer-shift > div { padding: .7rem; border: 1px solid var(--line); border-radius: .55rem; background: #faf5e8; }

/* ── 練功房 ── */
.practice-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .7rem; margin-top: .8rem; }
.practice-grid button { display: grid; gap: .3rem; min-height: 7rem; padding: .9rem; border: 1px solid var(--line); border-radius: .65rem; background: #faf5e8; color: var(--ink); text-align: left; }
.practice-grid b { color: var(--cinnabar-dark); font-size: 1.05rem; }
.practice-grid span { color: var(--ink-soft); line-height: 1.55; }

/* ── 字例總覽 ── */
.filterbar { display: flex; flex-wrap: wrap; gap: .55rem; margin-bottom: .55rem; align-items: end; }
.filterbar label { display: grid; gap: .2rem; color: var(--ink-soft); font-size: .78rem; }
.filterbar select, .filterbar input {
  font-family: inherit; font-size: .92rem; padding: .4rem .6rem;
  border: 1px solid var(--line); border-radius: .45rem; background: var(--card); color: var(--ink);
}
.filter-summary { display: flex; justify-content: space-between; gap: .5rem; margin-bottom: .8rem; font-size: .86rem; }
#filterCount { color: var(--cinnabar-dark); font-weight: 700; }
.char-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(76px, 1fr)); gap: .5rem; }
.char-tile {
  display: block; width: 100%; font-family: inherit; color: var(--ink);
  background: var(--card); border: 1px solid var(--line); border-radius: .55rem;
  padding: .5rem .2rem; text-align: center; cursor: pointer; box-shadow: var(--shadow);
}
.char-tile .big { display: block; font-size: 1.7rem; font-weight: 700; }
.char-tile .zy { display: block; font-size: .72rem; color: var(--ink-soft); }
.char-tile.mastered { outline: 2px solid var(--green); }
.char-tile:hover { border-color: var(--cinnabar); transform: translateY(-1px); }
.char-detail-overlay {
  position: fixed; inset: 0; background: rgba(40, 30, 15, .55); z-index: 2147483647;
  display: flex; align-items: center; justify-content: center; padding: 1rem;
}
.char-detail { max-width: 480px; width: 100%; max-height: 85vh; overflow-y: auto; }
.char-detail .headchar { font-size: 3.2rem; font-weight: 700; color: var(--cinnabar-dark); line-height: 1.1; }
.mastery-checklist { margin-top: .9rem; padding-top: .7rem; border-top: 1px dashed var(--line); }
.mastery-axis { padding: .55rem .65rem; margin-top: .5rem; border-radius: .55rem; background: #faf5e8; }
.mastery-axis h3 { margin-top: 0; }
.mastery-axis ul { display: grid; gap: .25rem; list-style: none; padding: 0; }
.mastery-axis li { color: var(--ink-soft); }
.mastery-axis li.done { color: #2f5233; font-weight: 700; }
.mastery-axis li span { display: inline-block; width: 1.5rem; }

.privacy-toggle { display: flex; align-items: center; gap: .55rem; min-height: 44px; padding: .7rem; border: 1px solid var(--line); border-radius: .55rem; background: #faf5e8; font-weight: 700; }
.privacy-toggle input { width: 1.25rem; height: 1.25rem; }

/* ── 問題回報 ── */
.report-launcher {
  position: fixed; left: max(14px, env(safe-area-inset-left)); bottom: max(14px, env(safe-area-inset-bottom)); z-index: 1000;
  min-height: 44px; padding: .55rem .85rem; border: 1px solid var(--cinnabar); border-radius: 99px;
  background: rgba(255, 253, 247, .96); color: var(--cinnabar-dark); font-weight: 700; box-shadow: var(--shadow);
}
.report-overlay { position: fixed; inset: 0; z-index: 2147483647; display: grid; place-items: center; padding: 1rem; background: rgba(40, 30, 15, .62); }
.report-dialog { width: min(100%, 520px); max-height: 90vh; overflow-y: auto; margin: 0; }
.report-dialog form { display: grid; gap: .8rem; }
.report-dialog label { display: grid; gap: .3rem; color: var(--cinnabar-dark); font-weight: 700; }
.report-dialog select, .report-dialog textarea { width: 100%; padding: .6rem; border: 1px solid var(--line); border-radius: .5rem; background: white; color: var(--ink); font: inherit; }
.report-dialog textarea { min-height: 7rem; resize: vertical; }
.report-context { padding: .6rem .7rem; border-radius: .5rem; background: var(--paper-deep); color: var(--ink-soft); font-size: .84rem; line-height: 1.6; }
.report-honeypot { position: absolute !important; left: -9999px !important; width: 1px !important; height: 1px !important; overflow: hidden !important; }
.report-success { color: #2f5233; font-weight: 700; }
.report-error { color: #8e2f1d; font-weight: 700; }
.dialog-close-icon {
  position: sticky; top: 0; z-index: 3; float: right; width: 44px; height: 44px;
  margin: -.2rem -.2rem .2rem .5rem; border: 1.5px solid var(--cinnabar); border-radius: 50%;
  background: rgba(255, 253, 247, .96); color: var(--cinnabar); font-size: 1.65rem; line-height: 1;
  box-shadow: var(--shadow);
}
.char-illustration {
  overflow: hidden; margin: .75rem 0; border: 1px solid var(--line); border-radius: .7rem;
  background: #faf8f3; box-shadow: 0 4px 14px rgba(76, 55, 30, .08);
}
.char-illustration img { display: block; width: 100%; height: auto; aspect-ratio: 16 / 9; object-fit: cover; }
.char-illustration figcaption { padding: .35rem .55rem; color: var(--ink-soft); font-size: .72rem; text-align: center; }

/* ── 閃卡 ── */
.flashcard {
  min-height: 260px; display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; cursor: pointer; user-select: none;
}
.flashcard .headchar { font-size: 4.5rem; font-weight: 700; }
.flash-progress { text-align: center; margin-bottom: .5rem; color: var(--ink-soft); font-size: .9rem; }
.grade-row { display: flex; gap: .5rem; justify-content: center; margin-top: .9rem; flex-wrap: wrap; }
.grade-row .btn.again { background: #9c3b2e; }
.grade-row .btn.hard { background: var(--gold); }
.grade-row .btn.good { background: var(--green); }

/* ── 出題 / 對戰 ── */
.q-stem { font-size: 1.08rem; line-height: 1.9; margin-bottom: .9rem; }
.q-stem .stem-char { font-size: 2.4rem; font-weight: 700; color: var(--cinnabar-dark); display: block; margin: .3rem 0; }
.opt-list { display: grid; gap: .55rem; }
.opt {
  text-align: left; background: var(--card); border: 1.5px solid var(--line);
  border-radius: .55rem; padding: .65rem .9rem; font-size: 1rem; line-height: 1.6;
}
.opt:not(:disabled):hover { border-color: var(--cinnabar); }
.opt.correct { border-color: var(--green); background: #e8f0e4; font-weight: 700; }
.opt.wrong { border-color: #9c3b2e; background: #f6e4e0; }
.opt.correct::after, .opt.wrong::after { display: block; margin-top: .15rem; font-size: .78rem; font-weight: 700; }
.opt.correct::after { content: "✓ 正確答案"; color: #2f5233; }
.opt.wrong::after { content: "✕ 你的答案"; color: #7f271d; }
.feedback { margin-top: .8rem; padding: .7rem .9rem; border-radius: .5rem; background: var(--paper-deep); line-height: 1.8; font-size: .95rem; }
.q-meta { display: flex; justify-content: space-between; align-items: center; margin-bottom: .6rem; color: var(--ink-soft); font-size: .88rem; flex-wrap: wrap; gap: .3rem; }

/* 大師對戰 */
.battle-shell { overflow: hidden; }
.battle-shell.is-fighting { padding: 0; border-color: #8b6827; background: #1e211b; }
.battle-shell.is-fighting .battle-lobby { display: none; }
.battle-arena {
  position: relative; overflow: hidden; color: #f9edc9;
  background:
    linear-gradient(90deg, rgba(16, 66, 58, .92), rgba(35, 34, 25, .32) 48%, rgba(84, 30, 20, .9)),
    radial-gradient(circle at 50% 32%, rgba(208, 164, 71, .32), transparent 36%),
    linear-gradient(150deg, #172921, #4a3a20 54%, #401f18);
  border-bottom: 1px solid rgba(205, 164, 75, .55);
}
.battle-arena::before {
  content: ""; position: absolute; inset: 0; pointer-events: none; opacity: .3;
  background:
    radial-gradient(circle at 15% 18%, transparent 0 12%, rgba(3, 11, 8, .8) 36%, transparent 37%),
    radial-gradient(circle at 78% 10%, rgba(255, 208, 103, .2), transparent 28%),
    repeating-linear-gradient(155deg, rgba(255,255,255,.035) 0 1px, transparent 1px 13px);
}
.arena-heading {
  position: relative; z-index: 2; min-height: 70px; display: grid;
  grid-template-columns: 1fr auto 1fr; align-items: center; gap: .5rem;
  padding: .65rem 1rem .4rem; text-align: center;
}
.arena-heading > div {
  grid-column: 2; min-width: 190px; padding: .3rem 1.5rem;
  border: 1px solid rgba(207, 165, 74, .7); border-radius: .25rem;
  background: rgba(18, 17, 13, .86); box-shadow: 0 5px 18px rgba(0,0,0,.34), inset 0 0 20px rgba(183,127,39,.12);
}
.arena-heading b { display: block; color: #ffe5a3; font-size: 1.18rem; letter-spacing: .25em; }
.arena-heading small { display: block; margin-top: .1rem; color: #d8c391; letter-spacing: .12em; }
.arena-ornament { height: 1px; background: linear-gradient(90deg, transparent, #b68b3a); }
.arena-exit {
  justify-self: end; border: 1px solid rgba(231,204,143,.55); border-radius: 99px;
  padding: .32rem .72rem; color: #f3dfad; background: rgba(12, 12, 10, .52); font-size: .76rem;
}
.arena-exit:hover { background: rgba(179, 64, 42, .65); }
.combatants {
  position: relative; z-index: 1; display: grid;
  grid-template-columns: minmax(0, 1fr) 64px minmax(0, 1fr); align-items: end;
  padding: .15rem 1.25rem 1.1rem;
}
.fighter { position: relative; min-width: 0; }
.fighter-player { color: #d8f2dc; }
.fighter-enemy { color: #ffe0d5; }
.fighter-name { position: relative; z-index: 2; margin: 0 auto -.5rem; width: min(90%, 250px); text-align: center; }
.fighter-name span {
  display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  padding: .18rem .4rem; color: #d8c89d; font-size: .68rem; letter-spacing: .06em;
}
.fighter-name b {
  display: block; padding: .3rem .5rem; color: #fff1c3; font-size: 1.08rem; letter-spacing: .18em;
  border: 1px solid currentColor; background: rgba(8, 25, 21, .78); box-shadow: 0 4px 15px rgba(0,0,0,.35);
}
.fighter-enemy .fighter-name b { background: rgba(61, 19, 14, .8); }
.fighter-art {
  position: relative; width: min(100%, 270px); margin: 0 auto; aspect-ratio: 4 / 3;
  overflow: hidden; border-radius: 46% 46% .4rem .4rem;
  filter: drop-shadow(0 10px 12px rgba(0,0,0,.4));
}
.fighter-art::after { content: ""; position: absolute; inset: 0; box-shadow: inset 0 -30px 28px rgba(8,12,8,.75); }
.fighter-art img { display: block; width: 100%; height: 100%; object-fit: cover; object-position: 50% 30%; }
.fighter-player .fighter-art img { transform: scaleX(-1); }
.fighter-stats {
  position: relative; z-index: 3; margin: -1.2rem auto 0; width: min(100%, 300px); padding: .55rem .65rem .6rem;
  border: 1px solid rgba(201,164,83,.58); background: rgba(7, 31, 26, .92);
  box-shadow: 0 7px 22px rgba(0,0,0,.34);
}
.fighter-enemy .fighter-stats { background: rgba(58, 19, 14, .92); }
.fighter-statline, .fighter-detail { display: flex; justify-content: space-between; align-items: center; gap: .4rem; }
.fighter-statline { margin-bottom: .3rem; color: #f5dda0; font-size: .8rem; }
.fighter-detail { margin-top: .35rem; color: #d7c99e; font-size: .68rem; }
.hp-bar { height: 12px; background: rgba(16, 12, 9, .7); border: 1px solid rgba(222, 190, 116, .55); border-radius: 99px; overflow: hidden; }
.hp-fill { height: 100%; background: linear-gradient(90deg, #3c7c4c, #83bb69); transition: width .45s ease; }
.hp-fill.enemy { background: linear-gradient(90deg, #9f2b22, #dc7153); }
.versus-seal {
  align-self: center; justify-self: center; z-index: 4; width: 58px; height: 58px;
  display: grid; place-items: center; color: #ffe6a1; font-size: 2.2rem; font-weight: 700;
  text-shadow: 0 0 8px #e78728, 0 0 20px #d55722;
  border: 1px solid rgba(229, 187, 90, .75); border-radius: 50%; background: rgba(37, 27, 16, .9);
  box-shadow: 0 0 0 5px rgba(167, 111, 38, .18), 0 0 26px rgba(217, 111, 28, .36);
}
.battle-round-meta {
  display: flex; justify-content: space-between; gap: .6rem; padding: .55rem 1rem;
  color: #ead8aa; background: #181913; border-bottom: 1px solid rgba(205, 164, 75, .45); font-size: .82rem;
}
.combo-tag { font-weight: 700; color: #e7c66f; }
.battle-question { padding: 1rem 1.2rem 1.2rem; color: var(--ink); background: var(--card); }
.battle-question .q-stem { padding: .6rem .8rem; border-left: 3px solid var(--gold); background: var(--paper-deep); }
.battle-question .opt { background: #fffdf7; }
.battle-shell.is-fighting > #battleArea > .feedback { margin: .8rem 1.2rem 0; color: var(--ink); }
.battle-result { padding: 2rem 1.2rem; text-align: center; color: var(--ink); background: var(--card); }
.battle-result p { margin-top: .45rem; }
.fighter.is-hit { animation: battleHit .45s ease; }
.fighter.is-shaken { animation: battleShake .42s ease; }
@keyframes battleHit { 35% { transform: translateX(8px); filter: brightness(1.65) sepia(.7); } }
@keyframes battleShake { 25% { transform: translateX(-7px); } 50% { transform: translateX(6px); filter: brightness(1.45); } 75% { transform: translateX(-3px); } }
.roster { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: .6rem; }
.master-card { text-align: center; padding: .8rem .5rem; }
.master-portrait { display: block; width: 100%; height: auto; aspect-ratio: 1; object-fit: cover; border-radius: .55rem; border: 1px solid var(--line); margin-bottom: .45rem; }
.master-card .name { font-weight: 700; margin: .2rem 0; }
.master-card.locked { opacity: .5; filter: grayscale(1); }
.master-card .beaten { color: var(--green); font-size: .82rem; }

/* ── 戰績 ── */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: .6rem; margin-bottom: .8rem; }
.stat-cell { background: var(--paper-deep); border-radius: .5rem; padding: .7rem; text-align: center; }
.stat-cell .num { font-size: 1.6rem; font-weight: 700; color: var(--cinnabar-dark); }
.stat-cell .lbl { font-size: .82rem; color: var(--ink-soft); }
.weak-list { display: flex; flex-wrap: wrap; gap: .4rem; }
.weak-item { border: 1px solid var(--line); background: var(--card); border-radius: .5rem; padding: .3rem .6rem; cursor: pointer; }
.weak-item b { font-size: 1.2rem; }
textarea.io { width: 100%; min-height: 90px; font-family: monospace; font-size: .8rem; border: 1px solid var(--line); border-radius: .5rem; padding: .5rem; background: var(--card); color: var(--ink); }

.foot { text-align: center; padding: 1.2rem 1rem calc(6rem + env(safe-area-inset-bottom)); color: var(--ink-soft); font-size: .8rem; line-height: 1.8; }
.foot a { color: inherit; text-underline-offset: .18em; }

.legal-page { max-width: 860px; margin: 0 auto; padding: 1rem; }
.legal-page .card { margin-bottom: 1rem; }
.legal-page h2 { margin-top: 0; }
.legal-page li + li { margin-top: .45rem; }
.legal-meta { color: var(--ink-soft); font-size: .9rem; }

@media (max-width: 480px) {
  .practice-grid { grid-template-columns: 1fr; }
  .brand h1 { font-size: 1.15rem; }
  .tab-scroll-hint { display: block; padding: .12rem .75rem .25rem; color: var(--ink-soft); font-size: .7rem; text-align: right; }
  .flashcard .headchar { font-size: 3.4rem; }
  main { padding: .7rem .7rem calc(6rem + env(safe-area-inset-bottom)); }
  .tools-discovery-note { font-size: .76rem; }
  .parent-support { grid-template-columns: 1fr; align-items: stretch; }
  .parent-support > button { justify-self: start; }
  .parent-guide-panel { grid-column: 1; }
  .parent-guide-grid { grid-template-columns: 1fr; }
  .concept-jump { position: static; overflow-x: auto; align-items: center; }
  .concept-jump-links { flex-wrap: nowrap; }
  .concept-jump a { flex: 0 0 auto; min-height: 44px; display: inline-flex; align-items: center; }
  .filterbar label { flex: 1 1 8rem; }
  .filterbar select, .filterbar input { width: 100%; }
  .story-characters { grid-template-columns: 1fr; }
  .story-characters figure { display: grid; grid-template-columns: 42% 1fr; align-items: center; }
  .battle-shell.is-fighting { margin-inline: -.05rem; }
  .arena-heading { min-height: 58px; grid-template-columns: 1fr auto; padding: .5rem .55rem .25rem; }
  .arena-heading > div { grid-column: 1; min-width: 0; padding: .28rem .65rem; }
  .arena-heading b { font-size: 1rem; }
  .arena-heading small { font-size: .75rem; }
  .arena-ornament { display: none; }
  .arena-exit { grid-column: 2; grid-row: 1; min-height: 44px; padding: .35rem .55rem; font-size: .75rem; }
  .combatants { grid-template-columns: minmax(0, 1fr) 38px minmax(0, 1fr); padding: .1rem .45rem .7rem; }
  .fighter-name { width: 96%; }
  .fighter-name span { font-size: .75rem; }
  .fighter-name b { padding: .24rem .2rem; font-size: .88rem; letter-spacing: .08em; }
  .fighter-art { aspect-ratio: 1 / 1.03; }
  .fighter-stats { margin-top: -.7rem; padding: .38rem .4rem .42rem; }
  .fighter-statline { font-size: .75rem; }
  .fighter-detail { font-size: .75rem; }
  .hp-bar { height: 9px; }
  .versus-seal { width: 36px; height: 36px; font-size: 1.4rem; box-shadow: 0 0 0 3px rgba(167, 111, 38, .18), 0 0 16px rgba(217, 111, 28, .32); }
  .battle-round-meta { padding: .45rem .65rem; font-size: .75rem; }
  .battle-question { padding: .72rem .7rem .9rem; }
  .battle-question .q-stem { font-size: .96rem; }
  .battle-shell.is-fighting > #battleArea > .feedback { margin: .65rem .7rem 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto !important; }
  .view.active, .fighter.is-hit, .fighter.is-shaken { animation: none !important; }
  .btn, .char-tile, .hp-fill { transition: none !important; }
  .btn:active, .char-tile:hover { transform: none; }
}

@media (forced-colors: active) {
  .opt.correct, .opt.wrong, .char-tile.mastered { outline: 3px solid CanvasText; }
  .opt.correct::after, .opt.wrong::after { color: CanvasText; }
}

/* ── 插圖 ── */
.story-fig { margin: .4rem 0 .9rem; }
.story-fig img {
  display: block; width: 100%; max-width: 100%; border-radius: .55rem;
  border: 1px solid var(--line); box-shadow: var(--shadow);
}