/* ============================================================
   NUWA GenAI Deck — Deck layout & components
   depends on tokens.css
   Style: Glassmorphism · Aurora UI · AI-native
   ============================================================ */

/* ---------- Aurora 背景層（流動光暈） ---------- */
body::before {
  content: ""; position: fixed; inset: -12%; z-index: 0; pointer-events: none;
  background:
    radial-gradient(38vw 38vw at 12% 16%, rgba(0,181,226,.34), transparent 60%),
    radial-gradient(44vw 44vw at 88% 10%, rgba(115,108,237,.30), transparent 62%),
    radial-gradient(48vw 48vw at 80% 90%, rgba(184,115,189,.24), transparent 60%),
    radial-gradient(40vw 40vw at 18% 94%, rgba(237,255,0,.16), transparent 60%),
    var(--bg-aurora, #F7FAFE);
  filter: blur(46px) saturate(1.06);
  animation: aurora-drift 26s ease-in-out infinite alternate;
}
/* ---------- AI-native 細網格疊層（淡出邊緣） ---------- */
body::after {
  content: ""; position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(13,52,87,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(13,52,87,.045) 1px, transparent 1px);
  background-size: 46px 46px;
  -webkit-mask-image: radial-gradient(125% 115% at 50% 28%, #000 52%, transparent 100%);
  mask-image: radial-gradient(125% 115% at 50% 28%, #000 52%, transparent 100%);
}
@keyframes aurora-drift {
  from { transform: translate3d(0, 0, 0) scale(1.02); }
  to   { transform: translate3d(-3%, -2%, 0) scale(1.12); }
}
@media (prefers-reduced-motion: reduce) {
  body::before { animation: none; }
}

/* ---------- Icon font (Google Material Symbols) ---------- */
.msym {
  font-family: "Material Symbols Rounded";
  font-weight: normal; font-style: normal;
  font-size: 1.25em; line-height: 1; letter-spacing: normal;
  display: inline-block; vertical-align: middle;
  font-variation-settings: "FILL" 0, "wght" 500, "GRAD" 0, "opsz" 24;
  -webkit-font-feature-settings: "liga"; -webkit-font-smoothing: antialiased;
  user-select: none;
}
.msym.fill { font-variation-settings: "FILL" 1, "wght" 500, "GRAD" 0, "opsz" 24; }

/* ---------- Corner logo (bottom-left) ---------- */
.brand-logo { height: 22px; width: auto; display: block; }
@media (max-width: 640px) { .brand-logo { height: 18px; } }

/* ---------- Deck / Slide ---------- */
.deck { position: relative; z-index: 1; }
.slide {
  position: fixed; inset: 0;
  display: flex; flex-direction: column; justify-content: safe center;
  padding: clamp(48px, 8vh, 96px) clamp(20px, 6vw, 80px) clamp(96px, 14vh, 140px);
  opacity: 0; visibility: hidden;
  transform: translateY(14px);
  transition: opacity .38s var(--ease), transform .38s var(--ease), visibility 0s linear .4s;
  overflow-y: auto;
}
.slide.active {
  opacity: 1; visibility: visible; transform: none;
  transition: opacity .45s var(--ease), transform .45s var(--ease);
  z-index: 2;
}
.slide-inner { width: 100%; max-width: 940px; margin: 0 auto; }

.snum { color: var(--nuwa-violet); font-weight: 700; font-size: var(--fs-caption); letter-spacing: .18em; }
.kicker { color: var(--nuwa-cyan-700); font-weight: 700; letter-spacing: .12em; font-size: var(--fs-caption); text-transform: uppercase; }
.slide h1 { font-size: var(--fs-display); font-weight: 700; line-height: 1.15; letter-spacing: -.01em; margin: var(--sp-2) 0 var(--sp-3); }
.slide h1::after { content: ""; display: block; width: 84px; height: 6px; margin-top: 14px; border-radius: 999px; background: linear-gradient(90deg, var(--nuwa-cyan), var(--nuwa-violet)); }
.slide h2.sub { font-size: var(--fs-headline); font-weight: 700; margin: var(--sp-5) 0 var(--sp-2); }
.slide h3 { font-size: var(--fs-title); font-weight: 700; margin: var(--sp-4) 0 var(--sp-2); }
.slide p { margin: 0 0 var(--sp-3); }
.lead { font-size: var(--fs-title); color: var(--ink-soft); font-weight: 400; margin-bottom: var(--sp-4); }
.muted { color: var(--ink-soft); }
.slide ul, .slide ol { margin: 0 0 var(--sp-3); padding-left: 1.35em; }
.slide li { margin-bottom: var(--sp-2); }
.slide li::marker { color: var(--nuwa-cyan); }
.hl { background: linear-gradient(transparent 60%, var(--nuwa-yellow) 60%); padding: 0 2px; font-weight: 500; }
/* CJK 斷行：callout 內只在標點處換行，避免詞語被拆到不同行 */
.callout ol li, .callout p { word-break: keep-all; overflow-wrap: anywhere; }
.mono { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; background: var(--surface); border: 1px solid var(--line); border-radius: 6px; padding: 2px 6px; font-size: .92em; }

/* ---------- Flow (arrow steps) ---------- */
.flow { display: flex; flex-wrap: wrap; align-items: stretch; gap: var(--sp-2); margin: var(--sp-3) 0; }
.flow .step { background: var(--cyan-soft); color: var(--nuwa-cyan-700); border-radius: var(--radius-sm); padding: 10px 14px; font-weight: 600; font-size: var(--fs-label); }
.flow .arw { align-self: center; color: var(--nuwa-cyan); font-weight: 700; }
.flow .step.warn { background: var(--yellow-soft); color: #6B7000; }
.flow .step.danger { background: var(--danger-soft); color: #A50E3C; }

/* ---------- Cards ---------- */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px,1fr)); gap: var(--sp-4); margin: var(--sp-3) 0; }
.card { position: relative; overflow: hidden; background: var(--glass-bg); backdrop-filter: blur(var(--glass-blur)); -webkit-backdrop-filter: blur(var(--glass-blur)); border: 1px solid var(--glass-border); border-radius: var(--radius); padding: var(--sp-5); box-shadow: var(--glass-shadow); transition: box-shadow .2s var(--ease), transform .2s var(--ease); }
.card:hover { box-shadow: var(--elev-3); transform: translateY(-3px); }
/* 角落柔光（Aurora glow，取代孟菲斯貼紙） */
.card::after { content: ""; position: absolute; top: -46px; right: -46px; width: 130px; height: 130px; border-radius: 999px; pointer-events: none; background: radial-gradient(circle, rgba(0,181,226,.24), transparent 70%); }
.cards .card:nth-child(2)::after { background: radial-gradient(circle, rgba(115,108,237,.24), transparent 70%); }
.cards .card:nth-child(3)::after { background: radial-gradient(circle, rgba(184,115,189,.24), transparent 70%); }
.cards .card:nth-child(4)::after { background: radial-gradient(circle, rgba(210,152,44,.22), transparent 70%); }
.card .icn { width: 40px; height: 40px; border-radius: 10px; display:grid; place-items:center; font-weight:700; margin-bottom: var(--sp-3); }
.card h3 { margin: 0 0 var(--sp-1); }
.card p { margin: 0; font-size: var(--fs-label); }

/* ---------- Chips ---------- */
.chips { display:flex; flex-wrap:wrap; gap: var(--sp-2); margin: var(--sp-3) 0; }
.tag { display:inline-flex; align-items:center; gap:6px; padding: 6px 12px; border-radius: 999px; font-size: var(--fs-label); font-weight: 500; }
.tag.cyan { background: var(--cyan-soft); color: var(--nuwa-cyan-700); }
.tag.yellow { background: var(--yellow-soft); color: #6B7000; }
.tag.violet { background: var(--violet-soft); color: #4038A8; }
.tag.orange { background: var(--orange-soft); color: #8A6212; }

/* ---------- Callouts ---------- */
.callout { border-radius: var(--radius); padding: var(--sp-4) var(--sp-5); margin: var(--sp-3) 0; border-left: 5px solid; box-shadow: var(--glass-shadow); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); }
.callout.key { background: rgba(237,255,0,.20); border-color: var(--nuwa-yellow); }
.callout.info { background: rgba(0,181,226,.15); border-color: var(--nuwa-cyan); }
.callout.note { background: rgba(115,108,237,.14); border-color: var(--nuwa-violet); }
.callout.danger { background: rgba(224,29,87,.12); border-color: var(--danger); }
.callout b { display:block; margin-bottom: 4px; }
.callout p { margin: 0; }

/* ---------- Expansion panel (折疊) ---------- */
details.panel { border: 1px solid var(--glass-border); border-radius: var(--radius); background: var(--glass-bg); backdrop-filter: blur(var(--glass-blur)); -webkit-backdrop-filter: blur(var(--glass-blur)); box-shadow: var(--glass-shadow); margin: var(--sp-3) 0; overflow: hidden; }
details.panel > summary { list-style:none; cursor:pointer; padding: var(--sp-4) var(--sp-5); font-weight: 600; display:flex; align-items:center; justify-content:space-between; gap: var(--sp-3); }
details.panel > summary::-webkit-details-marker { display:none; }
details.panel > summary .arrow { transition: transform .25s var(--ease); color: var(--nuwa-cyan-700); font-weight:700; font-size: 1.2em; }
details.panel[open] > summary .arrow { transform: rotate(90deg); }
details.panel > summary:hover { background: var(--surface); }
details.panel .body { padding: 0 var(--sp-5) var(--sp-5); color: var(--ink); }
details.panel .body p:last-child { margin-bottom: 0; }

/* ---------- Table ---------- */
.tbl-wrap { overflow-x: auto; margin: var(--sp-3) 0; border: 1px solid var(--glass-border); border-radius: var(--radius); background: var(--glass-bg); backdrop-filter: blur(var(--glass-blur)); -webkit-backdrop-filter: blur(var(--glass-blur)); box-shadow: var(--glass-shadow); }
table.tbl { width: 100%; border-collapse: collapse; font-size: var(--fs-label); min-width: 520px; }
table.tbl th, table.tbl td { text-align: left; padding: 10px 14px; border-bottom: 1px solid rgba(13,52,87,.10); }
table.tbl th { background: var(--nuwa-cyan-700); color: #fff; font-weight: 600; }
table.tbl tr:last-child td { border-bottom: none; }
table.tbl tbody tr:nth-child(even) { background: rgba(0,181,226,.06); }

/* ---------- 待回填 placeholder ---------- */
.todo { display: inline-block; background: var(--yellow-soft); border: 1px dashed var(--mod-orange); color: #8A6212; border-radius: 6px; padding: 1px 8px; font-size: .92em; font-weight: 500; }
.todo::before { content: "✎ "; }

/* ---------- Buttons ---------- */
.btn { display:inline-flex; align-items:center; gap:8px; background: var(--nuwa-cyan-700); color:#fff; border:none; border-radius: 999px; padding: 10px 20px; font-family:inherit; font-size: var(--fs-label); font-weight:600; cursor:pointer; box-shadow: var(--elev-1); text-decoration:none; }
.btn.ghost { background: transparent; color: var(--nuwa-cyan-700); border:1.5px solid var(--nuwa-cyan-700); box-shadow:none; }
.btn.accent { background: var(--nuwa-cyan); color: var(--nuwa-cyan-700); }

/* ---------- Top progress ---------- */
.progress { position: fixed; top: 0; left: 0; right: 0; height: 4px; background: var(--line); z-index: 50; }
.progress .fill { height: 100%; width: 0; background: linear-gradient(90deg, var(--nuwa-cyan), var(--nuwa-violet)); transition: width .35s var(--ease); }

/* ---------- Bottom nav bar ---------- */
.navbar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--sp-3);
  padding: 10px clamp(16px, 5vw, 40px);
  background: var(--glass-strong); backdrop-filter: blur(var(--glass-blur)); -webkit-backdrop-filter: blur(var(--glass-blur));
  border-top: 1px solid var(--glass-border);
}
.navbar .brand { font-weight: 700; font-size: var(--fs-caption); letter-spacing: .1em; color: var(--nuwa-cyan-700); white-space: nowrap; }
.navbar .brand b { color: var(--nuwa-cyan); }
.dots { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; }
.dots button { width: 10px; height: 10px; padding: 0; border-radius: 999px; border: none; background: var(--line); cursor: pointer; transition: all .2s var(--ease); }
.dots button:hover { background: var(--nuwa-cyan); }
.dots button.on { background: var(--nuwa-cyan); width: 26px; }
.nav-right { display: flex; align-items: center; gap: var(--sp-3); white-space: nowrap; }
.counter { font-variant-numeric: tabular-nums; font-weight: 600; font-size: var(--fs-label); color: var(--ink-soft); }
.counter b { color: var(--ink); }
.iconbtn { width: 38px; height: 38px; border-radius: 999px; border: 1.5px solid var(--line); background: var(--bg); cursor: pointer; font-size: 18px; color: var(--nuwa-cyan-700); display:grid; place-items:center; transition: all .2s var(--ease); }
.iconbtn:hover { border-color: var(--nuwa-cyan); background: var(--cyan-soft); }
.iconbtn:disabled { opacity: .35; cursor: not-allowed; }

/* ---------- Menu overlay (目錄) ---------- */
.menu-btn { position: fixed; top: 16px; right: clamp(16px,5vw,40px); z-index: 60; background: var(--glass-strong); backdrop-filter: blur(var(--glass-blur)); -webkit-backdrop-filter: blur(var(--glass-blur)); border-color: var(--glass-border); }
.overlay { position: fixed; inset: 0; z-index: 70; background: rgba(13,52,87,.4); backdrop-filter: blur(4px); display: none; }
.overlay.open { display: block; }
.overlay .sheet { position: absolute; top: 0; right: 0; height: 100%; width: min(420px, 88vw); background: var(--glass-strong); backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px); border-left: 1px solid var(--glass-border); box-shadow: var(--elev-3); padding: var(--sp-6) var(--sp-5); overflow-y: auto; transform: translateX(8px); }
.overlay .sheet h3 { margin: 0 0 var(--sp-4); }
.toc { list-style: none; margin: 0; padding: 0; }
.toc li { margin: 0; }
.toc a { display: flex; gap: 12px; align-items: baseline; padding: 12px 12px; border-radius: var(--radius-sm); color: var(--ink); text-decoration: none; }
.toc a:hover { background: var(--surface); }
.toc a.on { background: var(--cyan-soft); color: var(--nuwa-cyan-700); font-weight: 600; }
.toc a .n { color: var(--nuwa-violet); font-weight: 700; font-size: var(--fs-caption); width: 30px; flex: none; }

/* ---------- Hint ---------- */
.hint { position: fixed; bottom: 62px; left: 50%; transform: translateX(-50%); z-index: 40; font-size: var(--fs-caption); color: var(--ink-faint); background: rgba(255,255,255,.8); padding: 4px 12px; border-radius: 999px; opacity: 1; transition: opacity .6s; pointer-events: none; }
.hint.hide { opacity: 0; }

/* ---------- 8 步：2 欄 × 4 列 ---------- */
ol.steps2 { display: grid; grid-template-columns: 1fr 1fr; grid-template-rows: repeat(4, auto); grid-auto-flow: column; gap: 8px 32px; margin: 0; padding-left: 1.4em; }
ol.steps2 li { margin: 0; }
@media (max-width: 720px) { ol.steps2 { grid-auto-flow: row; grid-template-columns: 1fr; grid-template-rows: none; } }

/* ---------- Media split (同場加映) ---------- */
.media-split { display: grid; grid-template-columns: 1.05fr .95fr; gap: var(--sp-6); align-items: start; margin: var(--sp-3) 0; }
@media (max-width: 820px) { .media-split { grid-template-columns: 1fr; } }

.video-cover { position: relative; display: block; border-radius: var(--radius); overflow: hidden; box-shadow: var(--elev-2); border: 1px solid var(--line); aspect-ratio: 16 / 10; background: linear-gradient(135deg, var(--nuwa-cyan-700), var(--nuwa-violet)); text-decoration: none; }
.video-cover img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; display: block; }
.video-cover .play { position: absolute; inset: 0; display: grid; place-items: center; z-index: 2; }
.video-cover .play span { width: 66px; height: 66px; border-radius: 999px; background: rgba(255,255,255,.92); color: var(--nuwa-cyan-700); display: grid; place-items: center; font-size: 26px; box-shadow: var(--elev-2); transition: transform .2s var(--ease); }
.video-cover:hover .play span { transform: scale(1.08); }
.video-cover .cap { position: absolute; left: 0; right: 0; bottom: 0; z-index: 2; padding: 12px 14px; background: linear-gradient(transparent, rgba(13,52,87,.8)); color: #fff; font-size: var(--fs-label); font-weight: 600; }

.ts { list-style: none; padding: 0; margin: var(--sp-2) 0 0; }
.ts li { display: flex; gap: 12px; align-items: baseline; padding: 8px 0; border-bottom: 1px dashed var(--line); }
.ts li:last-child { border-bottom: none; }
.ts .t { font-variant-numeric: tabular-nums; font-weight: 700; color: var(--nuwa-violet); background: var(--violet-soft); border-radius: 6px; padding: 2px 9px; font-size: var(--fs-label); flex: none; }

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  .dots { display: none; }
  .slide { padding-bottom: 92px; }
}