/* 房仲 AI 實戰手冊 v2
   設計主軸：台灣門牌。章節代號用藍底白字、內框白線的門牌樣式。
   大膽只用在兩處：首頁的「門牌牆」與簡報的標題頁；其他地方保持安靜。
   動畫只有三種，都遵守「減少動態」設定：門牌牆進場（每次開啟網站一次）、章與章之間翻頁、簡報翻頁。
   時長參考 vercel-labs/agent-skills（react-view-transitions：退場 150ms、進場 210ms、位移約 60px）
   與 zarazhangrui/frontend-slides（ease-out-expo、手機關閉較重的特效）。 */

:root {
  --plate: #BF540C;
  --plate-deep: #9A4309;
  --plate-ink: #FFFFFF;
  --ink: #2E2722;
  --ink-2: #60564D;
  --ink-3: #81776E;
  --bg: #F5F4F2;
  --paper: #FFFFFF;
  --line: #E3DEDA;
  --line-2: #EFECE9;
  --tint: #FDEBDC;
  --code-bg: #FAF8F6;
  --green: #2F7D4F;
  --yellow: #B7791F;
  --red: #B83A32;
  --focus: #F2A900;
  --radius: 6px;
  --side: 288px;
  --measure: 42rem;
  --ease-out: cubic-bezier(.16, 1, .3, 1);      /* ease-out-expo */
  --ease-turn: cubic-bezier(.45, .05, .25, 1);
  --dur-exit: 150ms;
  --dur-enter: 210ms;
  --dur-turn: 480ms;
  --font: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", "Heiti TC", sans-serif;
  --shadow-paper: 0 1px 2px rgba(37, 32, 28, .06), 0 8px 24px rgba(37, 32, 28, .08);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --plate: #F28C28; --plate-deep: #D96F16; --plate-ink: #FFFFFF;
    --ink: #EEEAE7; --ink-2: #C8C0BA; --ink-3: #A39990;
    --bg: #1A1613; --paper: #25201C; --line: #403630; --line-2: #342C27;
    --tint: #362E29; --code-bg: #1E1A17;
    --green: #5DB37E; --yellow: #D9A441; --red: #E0766D;
    --shadow-paper: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .35);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --plate: #F28C28; --plate-deep: #D96F16; --plate-ink: #FFFFFF;
  --ink: #EEEAE7; --ink-2: #C8C0BA; --ink-3: #A39990;
  --bg: #1A1613; --paper: #25201C; --line: #403630; --line-2: #342C27;
  --tint: #362E29; --code-bg: #1E1A17;
  --green: #5DB37E; --yellow: #D9A441; --red: #E0766D;
  --shadow-paper: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .35);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 80px; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--font); font-size: 17px; line-height: 1.85; }
a { color: var(--plate); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
a, button, summary, label { touch-action: manipulation; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; border-radius: 3px; }
button { font: inherit; color: inherit; }
button:disabled { opacity: .35; cursor: default; }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--paper); padding: 8px 12px; z-index: 100; }
.skip:focus { left: 8px; }
.muted { color: var(--ink-3); }
.fine { font-size: .88rem; }

/* ---------- 門牌 ---------- */
.plate {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 3.1em; height: 2em; padding: 0 .55em;
  background: var(--plate); color: var(--plate-ink); border-radius: 5px;
  box-shadow: inset 0 0 0 2px var(--plate), inset 0 0 0 3.5px var(--plate-ink);
  font-weight: 700; font-size: .92rem; letter-spacing: .06em; line-height: 1;
  font-variant-numeric: tabular-nums; flex: none;
}
.plate-sm { min-width: 2.4em; height: 1.7em; font-size: .78rem; }
.plate-xl { font-size: 1.9rem; height: 2.05em; min-width: 3.2em; border-radius: 8px;
  box-shadow: inset 0 0 0 4px var(--plate), inset 0 0 0 6px var(--plate-ink); }
.plate.done { background: var(--green); box-shadow: inset 0 0 0 2px var(--green), inset 0 0 0 3.5px var(--plate-ink); }
.plate-xl.done { box-shadow: inset 0 0 0 4px var(--green), inset 0 0 0 6px var(--plate-ink); }

.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 8px 20px; border-radius: var(--radius);
  border: 1px solid var(--plate); background: var(--plate); color: var(--plate-ink); font-weight: 500; cursor: pointer; text-decoration: none; }
.btn:hover { background: var(--plate-deep); text-decoration: none; }
.btn.secondary { background: var(--paper); color: var(--plate); }
.btn.secondary:hover { background: var(--tint); }
.link-btn { border: 0; background: none; color: var(--plate); padding: 0; cursor: pointer; text-decoration: underline; text-underline-offset: 3px; }

/* ---------- 頂部列（手機） ---------- */
.topbar { display: none; position: sticky; top: 0; z-index: 30; height: 56px; align-items: center; gap: 8px; padding: 0 8px;
  background: color-mix(in srgb, var(--paper) 92%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.topbar .brand { flex: 1; }
.icon-btn { width: 44px; height: 44px; border: 0; background: none; border-radius: var(--radius); display: grid; place-items: center; cursor: pointer; }
.icon-btn svg, .deck-btn svg, .deck-nav svg, .deck-back svg { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.icon-btn:hover { background: var(--tint); }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 700; }

/* ---------- 版面 ---------- */
.layout { display: grid; grid-template-columns: var(--side) minmax(0, 1fr); min-height: 100vh; }
.sidebar { position: sticky; top: 0; height: 100vh; overflow-y: auto; background: var(--paper); border-right: 1px solid var(--line);
  padding: 20px 16px 24px; display: flex; flex-direction: column; gap: 14px; }
.brand-side { padding: 4px 6px 6px; }
.brand-side strong { display: block; font-size: 1.05rem; line-height: 1.3; }
.brand-side small { display: block; color: var(--ink-3); font-weight: 400; font-size: .8rem; }
.search input { width: 100%; height: 42px; padding: 0 12px; font: inherit; font-size: .95rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg); color: var(--ink); }
.search input:focus { outline: none; border-color: var(--plate); box-shadow: 0 0 0 3px var(--tint); }
.toc-part { margin-top: 6px; }
.toc-part h2 { font-size: .8rem; font-weight: 700; color: var(--ink-3); margin: 10px 6px 4px; letter-spacing: .08em; }
.toc-part ol { list-style: none; margin: 0; padding: 0; }
.toc-part a { display: flex; align-items: center; gap: 10px; padding: 6px; border-radius: var(--radius); color: var(--ink-2); text-decoration: none; font-size: .93rem; line-height: 1.4; }
.toc-part a:hover { background: var(--bg); color: var(--ink); }
.toc-part a[aria-current="page"] { background: var(--tint); color: var(--ink); font-weight: 500; }
.toc-part .plate { font-size: .75rem; }
.side-foot { margin-top: auto; display: flex; gap: 14px; align-items: center; padding: 12px 6px 0; border-top: 1px solid var(--line-2); font-size: .9rem; }

main { padding: 40px clamp(20px, 5vw, 64px) 96px; outline: none; view-transition-name: page; }
main:focus, main:focus-visible { outline: none; }
.page { max-width: var(--measure); }
.page-wide { max-width: 68rem; }
.page-title { font-size: 1.8rem; line-height: 1.3; margin: 0 0 12px; }
.section-title { font-size: 1.35rem; margin: 0 0 14px; }

/* ---------- 首頁 ---------- */
.hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); gap: 48px; align-items: center;
  padding: 12px 0 44px; border-bottom: 1px solid var(--line); margin-bottom: 40px; }
.hero-kicker { margin: 0 0 10px; color: var(--plate); font-weight: 700; }
.hero h1 { font-size: clamp(2.4rem, 5vw, 3.6rem); font-weight: 900; line-height: 1.12; margin: 0 0 18px; letter-spacing: .01em; }
.hero-lead { margin: 0; color: var(--ink-2); font-size: 1.08rem; max-width: 30rem; }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 26px; }

/* 門牌牆：一面釘滿門牌的牆，每一塊是一章 */
.wall { background: linear-gradient(180deg, color-mix(in srgb, var(--paper) 70%, var(--bg)), var(--paper));
  border: 1px solid var(--line); border-radius: 10px; padding: 22px 22px 16px; box-shadow: var(--shadow-paper); perspective: 900px; }
.wall-row { display: grid; grid-template-columns: 3.4em minmax(0, 1fr); gap: 10px; align-items: start; padding: 8px 0; }
.wall-row + .wall-row { border-top: 1px dashed var(--line); }
.wall-label { font-size: .8rem; font-weight: 700; color: var(--ink-3); padding-top: .6em; }
.wall-plates { display: flex; flex-wrap: wrap; gap: 8px; }
.wall-plate { position: relative; display: inline-flex; flex-direction: column; align-items: center; justify-content: center;
  width: 5.2em; height: 3.3em; border-radius: 6px; background: var(--plate); color: var(--plate-ink); text-decoration: none;
  box-shadow: inset 0 0 0 3px var(--plate), inset 0 0 0 4.5px var(--plate-ink), 0 2px 0 var(--plate-deep);
  transition: transform .18s var(--ease-out), box-shadow .18s var(--ease-out); transform-origin: 50% 0; }
.wall-plate .wp-code { font-weight: 900; font-size: 1.2rem; line-height: 1; letter-spacing: .06em; }
.wall-plate .wp-name { font-size: .58rem; line-height: 1.2; margin-top: 3px; max-width: 90%; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; opacity: .9; }
.wall-plate:hover, .wall-plate:focus-visible { transform: translateY(-3px); box-shadow: inset 0 0 0 3px var(--plate), inset 0 0 0 4.5px var(--plate-ink), 0 6px 14px rgba(57, 49, 43, .25); }
.wall-plate.done { background: var(--green); box-shadow: inset 0 0 0 3px var(--green), inset 0 0 0 4.5px var(--plate-ink), 0 2px 0 #1F5A37; }
.hero.intro .wall-plate { animation: plate-in .6s var(--ease-out) both; animation-delay: calc(var(--i) * 40ms + 120ms); }
@keyframes plate-in { from { opacity: 0; transform: rotateX(-95deg); } to { opacity: 1; transform: none; } }

.role-picker { margin: 0 0 44px; }
.role-picker > h2 { font-size: 1.35rem; margin: 0 0 4px; }
.role-picker > p { color: var(--ink-2); margin: 0 0 16px; }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--paper); }
.seg button { border: 0; background: none; padding: 10px 24px; min-height: 44px; cursor: pointer; font-weight: 500; font-size: 1rem; border-right: 1px solid var(--line); }
.seg button:last-child { border-right: 0; }
.seg button[aria-pressed="true"] { background: var(--plate); color: var(--plate-ink); }
.route { margin-top: 22px; background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); }
.route-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; padding: 16px 20px; border-bottom: 1px solid var(--line); }
.route-head h3 { margin: 0; font-size: 1.1rem; }
.progress { display: flex; align-items: center; gap: 10px; font-size: .92rem; color: var(--ink-2); }
.bar { width: 140px; height: 8px; background: var(--line-2); border-radius: 99px; overflow: hidden; }
.bar i { display: block; height: 100%; background: var(--green); width: 0; transition: width .4s var(--ease-out); }
.week { padding: 6px 20px 12px; border-bottom: 1px solid var(--line-2); }
.week:last-child { border-bottom: 0; }
.week h4 { margin: 12px 0 4px; font-size: .9rem; color: var(--ink-3); font-weight: 700; }
.route-item { display: grid; grid-template-columns: auto 1fr auto; gap: 14px; align-items: center; padding: 8px 0; text-decoration: none; color: var(--ink); }
.route-item + .route-item { border-top: 1px dashed var(--line-2); }
.route-item .name { font-weight: 500; line-height: 1.4; }
.route-item .goal { display: block; color: var(--ink-3); font-size: .88rem; font-weight: 400; }
.route-item .time { color: var(--ink-3); font-size: .85rem; white-space: nowrap; }
.route-item:hover .name { color: var(--plate); }
.quick { display: grid; grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr)); gap: 12px; margin-bottom: 24px; }
.quick a { display: block; padding: 14px 16px; background: var(--paper); border: 1px solid var(--line); border-left: 4px solid var(--plate); border-radius: var(--radius); text-decoration: none; color: var(--ink); }
.quick a strong { display: block; }
.quick a span { color: var(--ink-3); font-size: .88rem; }
.quick a:hover { border-color: var(--plate); }

/* ---------- 文章版 ---------- */
.reading-progress { position: fixed; top: 0; left: var(--side); right: 0; height: 3px; z-index: 35; pointer-events: none; }
.reading-progress i { display: block; height: 100%; background: var(--plate); transform: scaleX(0); transform-origin: 0 50%; }
.chapter-layout.with-rail { display: grid; grid-template-columns: minmax(0, var(--measure)) 14rem; gap: 56px; max-width: calc(var(--measure) + 14rem + 56px); }
.rail { position: sticky; top: 32px; align-self: start; max-height: calc(100vh - 64px); overflow-y: auto; font-size: .88rem; padding-left: 16px; border-left: 1px solid var(--line); }
.rail-title { font-weight: 700; color: var(--ink-3); margin: 0 0 6px; font-size: .8rem; letter-spacing: .06em; }
.rail ol { list-style: none; margin: 0 0 16px; padding: 0; }
.rail li a { display: block; padding: 4px 0 4px 10px; margin-left: -11px; border-left: 2px solid transparent; color: var(--ink-3); text-decoration: none; line-height: 1.45; }
.rail li a:hover { color: var(--ink); }
.rail li a.active { color: var(--plate); border-left-color: var(--plate); font-weight: 500; }
.rail-slides { display: inline-block; font-size: .85rem; }

.ch-head { display: flex; gap: 22px; align-items: flex-start; margin-bottom: 24px; }
.ch-kicker { margin: 0 0 4px; color: var(--ink-3); font-size: .9rem; }
.ch-head h1 { margin: 0; font-size: clamp(1.8rem, 3.6vw, 2.4rem); font-weight: 900; line-height: 1.25; }
.ch-head .sub { margin: 6px 0 0; color: var(--ink-2); font-size: 1.08rem; }
.view-switch { display: inline-flex; margin-top: 14px; border: 1px solid var(--line); border-radius: 99px; padding: 3px; background: var(--paper); }
.view-switch a { padding: 4px 18px; min-height: 36px; display: inline-flex; align-items: center; border-radius: 99px; text-decoration: none; color: var(--ink-2); font-size: .9rem; font-weight: 500; }
.view-switch a[aria-current="true"] { background: var(--plate); color: var(--plate-ink); }
.view-switch a:not([aria-current]):hover { background: var(--tint); color: var(--ink); }
.ch-toc { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); margin: 0 0 28px; }
.ch-toc summary { padding: 10px 16px; cursor: pointer; font-weight: 500; min-height: 44px; }
.ch-toc ol { margin: 0; padding: 0 16px 12px 40px; font-size: .93rem; line-height: 1.7; }
.with-rail .ch-toc { display: none; }

.prose h2 { display: flex; align-items: center; gap: 12px; font-size: 1.45rem; margin: 2.4em 0 .6em; line-height: 1.35; font-weight: 700; }
.prose h2.part-heading { display: block; font-size: 1.8rem; font-weight: 900; padding: .35em 0 .3em; border-bottom: 3px solid var(--plate); margin-top: 2.2em; }
.sec-num { display: inline-flex; align-items: center; justify-content: center; flex: none; width: 1.7em; height: 1.7em; border-radius: 5px;
  background: var(--tint); color: var(--plate); font-size: .8em; font-weight: 900; box-shadow: inset 0 0 0 1.5px var(--plate); }
.prose h3 { font-size: 1.15rem; margin: 1.9em 0 .4em; line-height: 1.4; }
.prose h4 { font-size: 1rem; margin: 1.5em 0 .3em; }
.prose p { margin: .8em 0; }
.prose a, .results p { overflow-wrap: anywhere; }
.prose ul, .prose ol { padding-left: 1.4em; margin: .6em 0; }
.prose li { margin: .25em 0; }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 2.4em 0; }
.prose strong { font-weight: 700; }
.prose code { background: var(--code-bg); border: 1px solid var(--line-2); padding: .05em .35em; border-radius: 4px; font-size: .92em; }
.prose pre code { background: none; border: 0; padding: 0; font: inherit; }
.chip { display: inline-block; padding: 0 .38em; margin: 0 .1em; border-radius: 4px; line-height: 1.5; background: var(--plate); color: var(--plate-ink);
  font-weight: 700; font-size: .82em; letter-spacing: .04em; text-decoration: none; vertical-align: .08em; }
.chip:hover { background: var(--plate-deep); }

.code { position: relative; margin: 1em 0 1.3em; }
.code pre { margin: 0; padding: 16px 18px; padding-right: 88px; background: var(--code-bg); border: 1px solid var(--line); border-left: 4px solid var(--plate);
  border-radius: var(--radius); white-space: pre-wrap; word-break: break-word; font-family: var(--font); font-size: .95rem; line-height: 1.75; }
.copy-btn { position: absolute; top: 8px; right: 8px; min-height: 32px; border: 1px solid var(--line); background: var(--paper); border-radius: var(--radius);
  padding: 3px 12px; font-size: .82rem; cursor: pointer; color: var(--ink-2); }
.copy-btn:hover { border-color: var(--plate); color: var(--plate); }
.copy-btn.ok { border-color: var(--green); color: var(--green); }

.table-wrap { overflow-x: auto; margin: 1em 0 1.4em; border: 1px solid var(--line); border-radius: var(--radius); background: var(--paper); }
table { border-collapse: collapse; width: 100%; font-size: .93rem; line-height: 1.65; }
th, td { text-align: left; vertical-align: top; padding: 9px 12px; border-bottom: 1px solid var(--line-2); }
th { background: var(--tint); font-weight: 700; white-space: nowrap; }
tbody tr:hover td { background: color-mix(in srgb, var(--tint) 45%, transparent); }
tr:last-child td { border-bottom: 0; }
td.prompt-cell { position: relative; padding-bottom: 40px; min-width: 16rem; }
td.prompt-cell .copy-btn { top: auto; bottom: 7px; right: 8px; }

.callout { margin: 1.2em 0; padding: 10px 16px; border-left: 4px solid var(--line); background: var(--paper); border-radius: 0 var(--radius) var(--radius) 0; }
.callout p { margin: .4em 0; }
.callout.warn { border-left-color: var(--yellow); background: color-mix(in srgb, var(--yellow) 7%, var(--paper)); }
.callout.tip { border-left-color: var(--plate); }
.callout.key { border-left-color: var(--plate); background: var(--tint); }
.callout.note { border-left-color: var(--ink-3); }

details.answer { margin: 1em 0; border: 1px dashed var(--line); border-radius: var(--radius); background: var(--paper); }
details.answer summary { cursor: pointer; padding: 8px 14px; color: var(--plate); font-weight: 500; min-height: 44px; display: flex; align-items: center; }
details.answer[open] summary { border-bottom: 1px dashed var(--line); }
details.answer > div { padding: 4px 16px 8px; }

ul.checklist { list-style: none; padding-left: 0; }
li.task label { display: flex; gap: 10px; align-items: flex-start; cursor: pointer; padding: 3px 0; }
li.task input { width: 1.15em; height: 1.15em; margin-top: .38em; accent-color: var(--green); flex: none; }
li.task input:checked + span { color: var(--ink-3); text-decoration: line-through; text-decoration-color: var(--ink-3); }
.check-count { font-size: .85rem; color: var(--ink-3); margin: -.2em 0 .4em; }
.check-count button { margin-left: 10px; }

.ch-foot { margin-top: 56px; padding-top: 24px; border-top: 1px solid var(--line); }
.done-toggle { display: inline-flex; align-items: center; gap: 10px; min-height: 44px; padding: 10px 18px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--paper); cursor: pointer; font-weight: 500; }
.done-toggle[aria-pressed="true"] { border-color: var(--green); color: var(--green); }
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 24px; }
.pager a { display: flex; flex-direction: column; gap: 4px; padding: 12px 16px; border: 1px solid var(--line); border-radius: var(--radius); text-decoration: none; color: var(--ink); background: var(--paper); }
.pager a span { display: flex; align-items: center; gap: 8px; font-weight: 500; }
.pager a small { color: var(--ink-3); }
.pager a:last-child { text-align: right; align-items: flex-end; }
.pager a:hover { border-color: var(--plate); }

/* 章與章之間的翻頁轉場（View Transitions；不支援的瀏覽器直接切換） */
@keyframes page-out-fwd  { to   { opacity: 0; transform: translateX(-60px) perspective(1400px) rotateY(6deg); } }
@keyframes page-in-fwd   { from { opacity: 0; transform: translateX(60px)  perspective(1400px) rotateY(-6deg); } }
@keyframes page-out-back { to   { opacity: 0; transform: translateX(60px)  perspective(1400px) rotateY(-6deg); } }
@keyframes page-in-back  { from { opacity: 0; transform: translateX(-60px) perspective(1400px) rotateY(6deg); } }
::view-transition-old(root), ::view-transition-new(root) { animation: none; }
::view-transition-old(page) { animation: page-out-fwd var(--dur-exit) ease-in both; }
::view-transition-new(page) { animation: page-in-fwd calc(var(--dur-enter) + 90ms) var(--ease-out) var(--dur-exit) both; }
html[data-dir="back"]::view-transition-old(page) { animation-name: page-out-back; }
html[data-dir="back"]::view-transition-new(page) { animation-name: page-in-back; }

/* ---------- 工具頁 ---------- */
.tool { background: var(--paper); border: 1px solid var(--line); border-radius: 8px; padding: 24px 26px; margin: 0 0 32px; box-shadow: var(--shadow-paper); }
.tool-head { display: flex; gap: 14px; align-items: flex-start; margin-bottom: 18px; }
.tool-no { display: inline-flex; align-items: center; justify-content: center; flex: none; width: 2.2em; height: 2.2em; border-radius: 6px; background: var(--plate); color: var(--plate-ink); font-weight: 900; box-shadow: inset 0 0 0 2px var(--plate), inset 0 0 0 3.5px var(--plate-ink); }
.tool h2 { margin: 0 0 4px; font-size: 1.3rem; }
.tool-head p { margin: 0; color: var(--ink-2); }
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr)); gap: 14px 18px; }
.field { display: flex; flex-direction: column; gap: 4px; }
.field.full { grid-column: 1 / -1; }
.field > span { font-weight: 500; font-size: .93rem; }
.field small { color: var(--ink-3); font-size: .82rem; }
.field input, .field textarea, .field select { font: inherit; font-size: .95rem; padding: 8px 10px; min-height: 44px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg); color: var(--ink); width: 100%; }
.field textarea { min-height: 5.5em; resize: vertical; line-height: 1.6; }
.field input:focus, .field textarea:focus, .field select:focus { outline: none; border-color: var(--plate); box-shadow: 0 0 0 3px var(--tint); }
.opts { display: flex; flex-wrap: wrap; gap: 8px 18px; }
.opts label { display: inline-flex; gap: 6px; align-items: center; font-size: .93rem; cursor: pointer; white-space: nowrap; min-height: 32px; }
.field .opts input { width: auto; min-height: 0; padding: 0; accent-color: var(--plate); }
.tool-out { margin-top: 20px; }
.tool-out h3 { font-size: 1rem; margin: 0 0 6px; }
.tool-note { font-size: .85rem; color: var(--ink-3); margin: 10px 0 0; }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 14px; }

/* ---------- 搜尋 ---------- */
.results { list-style: none; padding: 0; margin: 16px 0; }
.results li { padding: 14px 0; border-bottom: 1px solid var(--line); }
.results a { display: flex; gap: 10px; align-items: center; font-weight: 500; text-decoration: none; color: var(--ink); }
.results a:hover span:last-child { color: var(--plate); text-decoration: underline; }
.results p { margin: 6px 0 0; color: var(--ink-2); font-size: .93rem; }
mark { background: #FCE7A6; color: inherit; padding: 0 .1em; border-radius: 2px; }
:root[data-theme="dark"] mark { background: #6B5316; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) mark { background: #6B5316; } }

#toast { position: fixed; left: 50%; bottom: 24px; transform: translate(-50%, 12px); opacity: 0; pointer-events: none; background: var(--ink); color: var(--paper);
  padding: 8px 16px; border-radius: var(--radius); font-size: .92rem; transition: opacity .2s ease, transform .2s var(--ease-out); z-index: 90; }
#toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ============================================================
   簡報版
   ============================================================ */
body.deck-open { overflow: hidden; }
body.deck-open main { view-transition-name: none; }
.deck { position: fixed; inset: 0; z-index: 60; display: grid; grid-template-rows: auto 3px minmax(0, 1fr) auto;
  background: radial-gradient(120% 90% at 50% 0%, #3E342E 0%, #1F1A17 70%); color: #F5EEE9; }
.deck:fullscreen { background: #171412; }
.deck-top { display: flex; align-items: center; gap: 10px; padding: 10px 14px; }
.deck-title { display: flex; align-items: center; gap: 10px; flex: 1; min-width: 0; font-weight: 500; }
.deck-title span:last-child { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.deck .view-switch { margin: 0; background: rgba(255, 255, 255, .08); border-color: rgba(255, 255, 255, .16); }
.deck .view-switch a { color: #DDD4CC; }
.deck .view-switch a[aria-current="true"] { background: #fff; color: #403630; }
.deck .view-switch a:not([aria-current]):hover { background: rgba(255, 255, 255, .12); color: #fff; }
.deck-back, .deck-btn, .deck-nav { display: inline-grid; place-items: center; width: 44px; height: 44px; border-radius: 8px; border: 0; background: transparent; color: inherit; cursor: pointer; text-decoration: none; }
.deck-back:hover, .deck-btn:hover, .deck-nav:hover:not(:disabled) { background: rgba(255, 255, 255, .1); }
.deck-progress { background: rgba(255, 255, 255, .1); }
.deck-progress i { display: block; height: 100%; background: #F28C28; transform: scaleX(0); transform-origin: 0 50%; transition: transform .35s var(--ease-out); }
.stage { position: relative; overflow: hidden; margin: 12px 16px 0; touch-action: pan-y; }
.viewport { position: absolute; inset: 0; perspective: 2200px; }
.deck-bar { position: relative; display: flex; align-items: center; justify-content: center; gap: 14px; padding: 8px 14px 12px; }
.deck-count { min-width: 5em; text-align: center; font-variant-numeric: tabular-nums; font-size: .95rem; }
.deck-hint { position: absolute; right: 18px; font-size: .78rem; color: #B2A294; }

/* 投影片本體：以邏輯尺寸排版（橫式 1280×720、直式 720×1180），再整張縮放到舞台大小 */
.slide { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%) scale(var(--s, 1)); transform-origin: 50% 50%;
  background: #FFFFFF; color: #2E2722; border-radius: 14px; overflow: hidden; box-shadow: 0 30px 80px rgba(0, 0, 0, .45);
  font-size: 26px; line-height: 1.6; backface-visibility: hidden; }
.slide .slide-inner { position: absolute; inset: 0; padding: 52px 72px 78px; display: flex; flex-direction: column; }
.slide .slide-kicker { margin: 0 0 6px; color: #BF540C; font-weight: 700; font-size: 20px; letter-spacing: .04em; }
.slide .slide-head h2, .slide .slide-head h3 { margin: 0 0 18px; line-height: 1.25; font-weight: 900; color: #2A2522; }
.slide .slide-head h2 { font-size: 44px; display: flex; align-items: center; gap: 16px; }
.slide .slide-head h3 { font-size: 38px; }
.slide .cont { margin: -10px 0 10px; font-size: 18px; color: #81776E; }
.slide .slide-body { flex: 1; min-height: 0; overflow: hidden; overflow-wrap: anywhere; }
.slide .slide-body:has(details[open]) { overflow-y: auto; }
.slide .slide-body > :first-child { margin-top: 0; }
.slide p { margin: .45em 0; }
.slide ul, .slide ol { margin: .4em 0; padding-left: 1.3em; }
.slide li { margin: .2em 0; }
.slide h4 { font-size: 28px; margin: .6em 0 .2em; }
.slide .sec-num { width: 1.4em; height: 1.4em; background: #FDEBDC; color: #BF540C; box-shadow: inset 0 0 0 2px #BF540C; border-radius: 8px; font-size: .75em; }
.slide .table-wrap { margin: .5em 0; border-color: #E3DEDA; background: #fff; overflow: hidden; }
.slide table { font-size: 21px; line-height: 1.5; }
.slide th { background: #FDEBDC; color: #2A2522; white-space: normal; }
.slide th, .slide td { padding: 10px 14px; border-color: #EFECE9; }
.slide tbody tr:hover td { background: none; }
.slide td.prompt-cell { padding-bottom: 44px; min-width: 0; }
.slide .code pre { font-size: 21px; line-height: 1.6; padding: 16px 20px; padding-right: 110px; background: #FAF8F6; color: #2E2722; border-color: #E3DEDA; border-left-color: #BF540C; }
.slide .copy-btn { font-size: 16px; padding: 4px 14px; background: #fff; color: #60564D; border-color: #E3DEDA; }
.slide .callout { font-size: 23px; background: #FBF7F2; border-left-color: #D4CCC6; padding: 10px 20px; }
.slide .callout.warn { border-left-color: #B7791F; background: #FBF6EC; }
.slide .callout.key, .slide .callout.tip { border-left-color: #BF540C; background: #FDF1E6; }
.slide details.answer { background: #fff; border-color: #D4CCC6; }
.slide details.answer summary { color: #BF540C; }
.slide .chip { background: #BF540C; color: #fff; }
.slide a { color: #BF540C; }
.slide code { background: #FAF8F6; border-color: #EFECE9; }
.slide li.task input { width: 22px; height: 22px; margin-top: 8px; }
.slide .scroll-y { max-height: 100%; overflow-y: auto; }
.slide .slide-foot { position: absolute; left: 72px; right: 72px; bottom: 24px; display: flex; align-items: center; gap: 12px; font-size: 16px; color: #A0968D; }
.slide .slide-foot .plate { background: #BF540C; color: #fff; box-shadow: inset 0 0 0 2px #BF540C, inset 0 0 0 3.5px #fff; }
.slide .sf-num { margin-left: auto; font-variant-numeric: tabular-nums; }

/* 標題頁、分隔頁：整面門牌藍，是簡報裡唯一的強烈版面 */
.slide.type-title, .slide.type-divider { background: #BF540C; color: #fff; }
.slide.type-title::before, .slide.type-divider::before { content: ""; position: absolute; inset: 22px; border: 3px solid rgba(255, 255, 255, .9); border-radius: 10px; pointer-events: none; }
.title-slide { justify-content: center; }
.title-slide .ts-plate .plate { background: #fff; color: #BF540C; box-shadow: inset 0 0 0 5px #fff, inset 0 0 0 8px #BF540C; }
.plate-xxl { font-size: 64px; height: 1.9em; min-width: 3.1em; border-radius: 12px; }
.title-slide .ts-kicker { margin: 34px 0 6px; font-size: 22px; opacity: .85; }
.title-slide h1 { margin: 0; font-size: 76px; line-height: 1.15; font-weight: 900; }
.title-slide .ts-sub { margin: 14px 0 0; font-size: 32px; opacity: .92; }
.title-slide .ts-meta { margin: 26px 0 0; font-size: 20px; opacity: .75; }
.slide.type-title .slide-foot, .slide.type-divider .slide-foot { color: rgba(255, 255, 255, .7); bottom: 44px; left: 60px; right: 60px; }
.slide.type-title .slide-foot .plate, .slide.type-divider .slide-foot .plate { background: #fff; color: #BF540C; box-shadow: none; }
.divider-slide { justify-content: center; }
.divider-slide h2 { margin: 0; font-size: 88px; font-weight: 900; border: 0; color: #fff; }
.end-slide { justify-content: center; align-items: flex-start; gap: 18px; }
.end-slide h2 { margin: 6px 0 0; font-size: 52px; font-weight: 900; color: #2A2522; }
.end-slide p { color: #60564D; margin: 0; }
.end-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 12px; }
.end-actions .btn { font-size: 22px; min-height: 60px; padding: 10px 28px; background: #BF540C; border-color: #BF540C; color: #fff; }
.end-actions .btn.secondary { background: #fff; color: #BF540C; }

/* 直式（手機直拿）：字放大、內距縮小 */
.slide.fmt-portrait { font-size: 30px; }
.slide.fmt-portrait .slide-inner { padding: 56px 48px 90px; }
.slide.fmt-portrait .slide-head h2 { font-size: 46px; }
.slide.fmt-portrait .slide-head h3 { font-size: 40px; }
.slide.fmt-portrait table { font-size: 24px; }
.slide.fmt-portrait .code pre { font-size: 25px; padding-right: 20px; padding-top: 58px; }
.slide.fmt-portrait .slide-foot { left: 48px; right: 48px; font-size: 20px; }
.slide.fmt-portrait .title-slide h1 { font-size: 72px; }
.slide.fmt-portrait .sf-name { display: none; }

/* 翻頁：往後翻時，舊頁以左邊為軸像書頁一樣翻起；往前翻時，前一頁從左邊翻回來。
   軸心不能用 transform-origin 移到左邊：那會連同 scale(--s) 的基準點一起移動，動畫一開始整頁會橫向跳動。
   改用 translateX(-50%) → rotateY → translateX(50%) 在左邊緣旋轉，縮放仍以中心為準。 */
@keyframes turn-away {
  from { transform: translate(-50%, -50%) scale(var(--s)) translateX(-50%) rotateY(0deg) translateX(50%); }
  to   { transform: translate(-50%, -50%) scale(var(--s)) translateX(-50%) rotateY(-92deg) translateX(50%); } }
@keyframes turn-back {
  from { transform: translate(-50%, -50%) scale(var(--s)) translateX(-50%) rotateY(-92deg) translateX(50%); }
  to   { transform: translate(-50%, -50%) scale(var(--s)) translateX(-50%) rotateY(0deg) translateX(50%); } }
@keyframes rise { from { transform: translate(-50%, -50%) scale(calc(var(--s) * .965)); filter: brightness(.8); } }
@keyframes sink { to { transform: translate(-50%, -50%) scale(calc(var(--s) * .965)); filter: brightness(.8); } }
.slide.leave-next { z-index: 2; animation: turn-away var(--dur-turn) var(--ease-turn) both; will-change: transform; }
.slide.enter-next { z-index: 1; animation: rise var(--dur-turn) var(--ease-out) both; }
.slide.enter-prev { z-index: 2; animation: turn-back var(--dur-turn) var(--ease-turn) both; will-change: transform; }
.slide.leave-prev { z-index: 1; animation: sink var(--dur-turn) var(--ease-out) both; }

/* 總覽 */
.overview { position: absolute; inset: 0; z-index: 5; background: rgba(21, 17, 15, .97); overflow-y: auto; padding: 0 20px 40px; }
.ov-head { display: flex; align-items: center; justify-content: space-between; position: sticky; top: 0; padding: 12px 0; background: rgba(21, 17, 15, .97); z-index: 1; }
.ov-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 22px 18px; }
.deck[data-fmt="portrait"] .ov-grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }
.ov-item { border: 0; background: none; color: #DDD4CC; cursor: pointer; padding: 0; text-align: left; display: flex; flex-direction: column; gap: 6px; align-items: flex-start; }
.ov-frame { position: relative; overflow: hidden; border-radius: 6px; outline: 2px solid transparent; outline-offset: 3px; }
.ov-item.current .ov-frame, .ov-item:hover .ov-frame { outline-color: #F28C28; }
.slide.thumb { left: 0; top: 0; transform: scale(var(--s)); transform-origin: 0 0; box-shadow: none; border-radius: 0; pointer-events: none; }
.measure-host { position: absolute; left: -99999px; top: 0; visibility: hidden; pointer-events: none; }
.measure-host .slide { transform: none; left: 0; top: 0; }

/* ---------- 平板與手機 ---------- */
@media (max-width: 1240px) {
  .chapter-layout.with-rail { display: block; max-width: var(--measure); }
  .rail { display: none; }
  .with-rail .ch-toc { display: block; }
}
@media (max-width: 1080px) {
  .hero { grid-template-columns: minmax(0, 1fr); gap: 28px; }
}
@media (max-width: 900px) {
  body { font-size: 16px; }
  .topbar { display: flex; }
  .layout { grid-template-columns: minmax(0, 1fr); }
  .sidebar { position: fixed; top: 0; left: 0; bottom: 0; z-index: 50; width: min(86vw, 320px); height: 100%;
    transform: translateX(-102%); transition: transform .24s var(--ease-out); box-shadow: 0 0 40px rgba(0, 0, 0, .18); }
  body.nav-open .sidebar { transform: none; }
  .scrim { position: fixed; inset: 0; background: rgba(19, 17, 15, .45); z-index: 40; }
  main { padding: 24px 16px 80px; }
  .reading-progress { top: 56px; left: 0; }
  .ch-head { gap: 14px; flex-direction: column; }
  .plate-xl { font-size: 1.35rem; }
  .route-item { grid-template-columns: auto 1fr; }
  .route-item .time { grid-column: 2; }
  .seg { display: flex; width: 100%; }
  .seg button { flex: 1; padding: 10px 8px; }
  .code pre { padding-right: 16px; padding-top: 44px; }
  .pager { grid-template-columns: 1fr; }
  .pager a:last-child { text-align: left; align-items: flex-start; }
  .tool { padding: 18px 16px; }
  .wall { padding: 16px 14px 10px; }
  .wall-row { grid-template-columns: minmax(0, 1fr); gap: 4px; }
  .wall-label { padding-top: 0; }
  .wall-plate { width: 4.6em; height: 3em; }
  .deck-top { padding: 6px 8px; gap: 4px; }
  .deck-title { display: none; }
  .deck-top .view-switch { margin-right: auto; }
  .stage { margin: 8px 8px 0; }
  .deck-hint { display: none; }
  .deck-bar { padding-bottom: max(12px, env(safe-area-inset-bottom)); }
  .deck-nav { width: 56px; height: 48px; background: rgba(255, 255, 255, .08); }
}
/* 手機：關掉較重的 3D 翻頁，改成平移（frontend-slides 建議手機關閉較重的特效） */
@media (max-width: 768px) {
  @keyframes slide-out-l { to { transform: translate(-50%, -50%) scale(var(--s)) translateX(-45%); opacity: 0; } }
  @keyframes slide-in-r  { from { transform: translate(-50%, -50%) scale(var(--s)) translateX(45%); opacity: 0; } }
  @keyframes slide-out-r { to { transform: translate(-50%, -50%) scale(var(--s)) translateX(45%); opacity: 0; } }
  @keyframes slide-in-l  { from { transform: translate(-50%, -50%) scale(var(--s)) translateX(-45%); opacity: 0; } }
  .slide.leave-next { animation: slide-out-l .3s var(--ease-out) both; }
  .slide.enter-next { animation: slide-in-r .3s var(--ease-out) both; }
  .slide.leave-prev { animation: slide-out-r .3s var(--ease-out) both; }
  .slide.enter-prev { animation: slide-in-l .3s var(--ease-out) both; }
}
@media (hover: none) { .deck-hint { display: none; } }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0s !important; animation-delay: 0s !important; transition-duration: 0s !important; scroll-behavior: auto !important; }
  ::view-transition-old(page), ::view-transition-new(page) { animation: none !important; }
}
@media print {
  .topbar, .sidebar, .copy-btn, .ch-foot, .ch-toc, .rail, .reading-progress, .view-switch { display: none !important; }
  .layout { display: block; }
  .chapter-layout.with-rail { display: block; }
}