/* 《一个会猜下一个词的机器》新生分享 · 主题
   暖纸底色 + 墨绿主色 + 琥珀强调，与实验室既有分享保持同一视觉语言。 */

:root {
  --paper: #f5f4f0;
  --paper-raise: #fdfcfa;
  --ink: #1c1f24;
  --ink-soft: #3d434b;
  --muted: #7a8087;
  --line: rgba(28, 31, 36, 0.12);
  --accent: #0e7569;
  --accent-deep: #0a5a50;
  --accent-soft: rgba(14, 117, 105, 0.09);
  --amber: #b4590a;
  --amber-soft: rgba(180, 89, 10, 0.10);
  --chat-bg: #12171e;
  --chat-raise: #1a212b;
  --chat-ink: #e8e4db;
  --chat-dim: #8f9aa5;
  --chat-green: #4ade80;
  --chat-cyan: #22d3ee;
}

/* ---------- 字体 ---------- */
@font-face {
  font-family: 'JetBrains Mono';
  src: url('./assets/fonts/jetbrains-mono-latin-wght-normal.woff2') format('woff2');
  font-weight: 100 800;
  font-style: normal;
  font-display: swap;
}

/* ---------- Reveal 基础 ---------- */
.reveal {
  font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  font-size: 34px;
  color: var(--ink);
}
.reveal-viewport { background: var(--paper); }
.reveal .slides section { text-align: left; }
.reveal h1, .reveal h2, .reveal h3 {
  font-family: inherit;
  font-weight: 700;
  letter-spacing: 0.01em;
  text-transform: none;
  color: var(--ink);
}
.reveal h2 { font-size: 1.5em; margin: 0 0 0.5em; }
.reveal p { line-height: 1.6; }
.reveal code, .reveal pre {
  font-family: 'JetBrains Mono', 'Noto Sans SC', monospace;
}
.reveal pre { box-shadow: none; width: 100%; }
.reveal .progress { color: var(--accent); }
.reveal .slide-number { background: transparent; color: var(--muted); }

/* ---------- 标题页 ---------- */
.reveal .slides section.title-slide { text-align: center; }
.title-overline {
  font-size: 0.48em;
  letter-spacing: 0.18em;
  color: var(--accent);
  margin-bottom: 1.6em;
}
.title-slide h1 {
  margin: 0;
  font-size: 2.1em;
  line-height: 1.18;
  letter-spacing: 0.035em;
}
.title-rule {
  width: 72px;
  height: 3px;
  margin: 1.15em 0 0.9em;
  background: var(--amber);
}
.title-sub {
  margin: 0;
  font-size: 0.78em;
  color: var(--ink-soft);
  letter-spacing: 0.02em;
}
.title-meta {
  margin: 2.8em 0 0;
  font-size: 0.48em;
  color: var(--muted);
  letter-spacing: 0.12em;
}

/* ---------- 通用小件 ---------- */
.kicker {
  display: inline-block;
  font-size: 0.5em;
  letter-spacing: 0.18em;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 999px;
  padding: 0.25em 1em;
  margin-bottom: 1.1em;
}
.kicker.amber { color: var(--amber); border-color: var(--amber); }
.rule { width: 64px; height: 3px; background: var(--accent); margin: 0.7em 0 1em; }
.statement { font-size: 1.15em; font-weight: 600; line-height: 1.55; color: var(--ink); }
.statement .em, .em { color: var(--accent-deep); font-style: normal; }
.em-amber { color: var(--amber); font-style: normal; }
.sub { color: var(--muted); font-size: 0.62em; line-height: 1.7; }
.small { font-size: 0.62em; color: var(--ink-soft); line-height: 1.65; }
.tiny { font-size: 0.5em; color: var(--muted); line-height: 1.6; }
.mono { font-family: 'JetBrains Mono', monospace; }

/* ---------- 居中大问句页 ---------- */
.q-slide { text-align: center; }
.q-slide .kicker { margin-bottom: 1.4em; }
.big-q {
  font-size: 1.35em;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
}
.end-line {
  font-size: 1.5em;
  font-weight: 800;
  line-height: 1.45;
}
.closing-line { color: var(--ink-soft); font-size: 0.72em; margin-top: 1.4em; line-height: 1.7; }
.closing-line b { color: var(--accent-deep); }

/* ---------- 开场三问 ---------- */
.open-qs { margin-top: 0.8em; }
.open-qs .oq {
  font-size: 0.95em;
  font-weight: 600;
  line-height: 1.5;
  padding: 0.55em 0;
  border-bottom: 1px dashed var(--line);
  display: flex;
  align-items: baseline;
  gap: 0.8em;
}
.open-qs .oq:last-child { border-bottom: 0; }
.open-qs .oq .no {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7em;
  color: var(--accent);
  flex: none;
}
.open-qs .oq .hint { font-size: 0.58em; color: var(--muted); font-weight: 400; margin-left: auto; flex: none; }

/* ---------- 对话演示（模拟 AI 聊天） ---------- */
.chat {
  background: var(--chat-bg);
  border-radius: 14px;
  padding: 0.7em 0.8em;
  font-size: 0.62em;
  line-height: 1.55;
  box-shadow: 0 18px 50px rgba(18, 23, 30, 0.28);
  max-height: 31em;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: var(--chat-raise) transparent;
}
/* 打印/减弱动效：解除封顶，内容全量平铺。 */
.static-mode .chat { max-height: none; overflow: visible; }
.chat.chat-fixed {
  box-sizing: border-box;
  height: 14em;
  max-height: 14em;
}
.static-mode .chat.chat-fixed { height: auto; max-height: none; }
.chat .msg { margin: 0.55em 0; display: flex; gap: 0.6em; align-items: center; }
.chat .who {
  flex: none;
  font-size: 0.72em;
  letter-spacing: 0.06em;
  padding: 0.28em 0.7em;
  border-radius: 999px;
}
.chat .who.user { color: var(--chat-cyan); border: 1px solid rgba(34, 211, 238, 0.4); }
.chat .who.ai { color: var(--chat-green); border: 1px solid rgba(74, 222, 128, 0.4); }
.chat .bubble {
  background: var(--chat-raise);
  color: var(--chat-ink);
  border-radius: 10px;
  padding: 0.55em 0.85em;
  flex: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5em;
}
.chat .bubble code { color: var(--chat-cyan); font-size: 0.95em; }
.chat .bubble .dim { color: var(--chat-dim); }
.chat .bubble .hl { color: var(--chat-green); font-weight: 600; }
.chat .bubble .bad { color: #f5a97f; font-weight: 600; }
.demo-tag {
  display: inline-block;
  font-size: 0.42em;
  letter-spacing: 0.14em;
  color: var(--amber);
  border: 1px dashed var(--amber);
  border-radius: 6px;
  padding: 0.3em 0.9em;
  margin-bottom: 0.9em;
}

/* ---------- 手机输入法动画 ---------- */
.phone {
  width: 340px;
  margin: 0 auto;
  background: var(--chat-bg);
  border-radius: 26px;
  padding: 18px 16px 14px;
  box-shadow: 0 18px 50px rgba(18, 23, 30, 0.3);
}
.phone .screen {
  background: var(--chat-raise);
  border-radius: 12px;
  min-height: 96px;
  padding: 14px 14px;
  color: var(--chat-ink);
  font-size: 0.68em;
  line-height: 1.6;
}
.phone .screen .cursor {
  display: inline-block;
  width: 2px; height: 1em;
  background: var(--chat-green);
  vertical-align: -0.15em;
  animation: blink 1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }
.phone .imebar {
  display: flex;
  gap: 8px;
  margin-top: 12px;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.45s ease, transform 0.45s ease;
}
.phone .imebar.on { opacity: 1; transform: none; }
.phone .imebar .cand {
  flex: 1;
  text-align: center;
  background: rgba(255, 255, 255, 0.07);
  color: var(--chat-ink);
  border-radius: 8px;
  padding: 8px 0;
  font-size: 0.6em;
}
.phone .imebar .cand:first-child { background: rgba(74, 222, 128, 0.16); color: var(--chat-green); font-weight: 600; }

/* ---------- 填空 ---------- */
.cloze { font-size: 1em; line-height: 2.1; }
.cloze .blank {
  display: inline-block;
  min-width: 2.4em;
  border-bottom: 3px solid var(--accent);
  color: var(--accent-deep);
  font-weight: 700;
  text-align: center;
}
.cloze .who-line { color: var(--muted); font-size: 0.5em; }

/* ---------- 三例卡片 ---------- */
.cards { display: flex; gap: 0.6em; margin-top: 0.5em; }
.cards .card {
  flex: 1;
  background: var(--paper-raise);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.7em 0.8em;
  font-size: 0.62em;
  line-height: 1.6;
}
.cards .card b { color: var(--accent-deep); }
.cards .card .q { color: var(--ink); font-weight: 600; }
.cards .card .need { margin-top: 0.6em; color: var(--amber); font-weight: 600; }
.cards.three .card { font-size: 0.66em; }

/* ---------- Transformer 简化动画 ---------- */
.transformer-demo {
  --tf-cyan: #22d3ee;
  --tf-green: #4ade80;
  --tf-violet: #a78bfa;
  --tf-amber: #fbbf24;
  position: relative;
  height: 23.7em;
  box-sizing: border-box;
  overflow: hidden;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 0.65em;
  padding: 0.75em;
  border: 1px solid rgba(34, 211, 238, 0.24);
  border-radius: 16px;
  background:
    radial-gradient(circle at 18% 0%, rgba(34, 211, 238, 0.13), transparent 34%),
    radial-gradient(circle at 85% 100%, rgba(167, 139, 250, 0.12), transparent 38%),
    #10161d;
  box-shadow: 0 22px 55px rgba(15, 23, 32, 0.3), inset 0 0 45px rgba(34, 211, 238, 0.035);
  color: var(--chat-ink);
  font-size: 0.55em;
  line-height: 1.25;
}
.transformer-demo::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.35;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 28px 28px;
}
.transformer-demo > * { position: relative; z-index: 1; }
.tf-sequence, .tf-output {
  align-items: center;
  gap: 0.5em;
  min-height: 2.15em;
  padding: 0.42em 0.65em;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 9px;
  background: rgba(255, 255, 255, 0.045);
}
.tf-sequence {
  display: grid;
  grid-template-columns: auto auto auto auto auto minmax(0, 1fr) auto;
  row-gap: 0.38em;
}
.tf-output { display: flex; }
.tf-seq-label, .tf-output > span {
  flex: none;
  color: var(--chat-dim);
  font-size: 0.86em;
  letter-spacing: 0.08em;
}
.tf-seq-label b {
  margin-right: 0.25em;
  color: var(--tf-cyan);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9em;
}
.tf-raw-text {
  padding: 0.2em 0.42em;
  border-radius: 5px;
  color: #f8fafc;
  font-size: 0.92em;
  white-space: nowrap;
  transition: color 0.3s, background 0.3s, box-shadow 0.3s;
}
.tf-mini-arrow {
  color: rgba(226, 232, 240, 0.42);
  transition: color 0.3s, text-shadow 0.3s;
}
.tf-tokenizer-chip {
  padding: 0.22em 0.52em;
  border: 1px solid rgba(251, 191, 36, 0.28);
  border-radius: 999px;
  background: rgba(251, 191, 36, 0.06);
  color: #fde68a;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82em;
  font-weight: 700;
  white-space: nowrap;
  transition: border-color 0.3s, background 0.3s, box-shadow 0.3s;
}
.tf-seq-tokens {
  display: flex;
  align-items: center;
  gap: 0.32em;
  min-width: 0;
  overflow: hidden;
  opacity: 1;
  transform: none;
  transition: opacity 0.34s, transform 0.34s;
}
.transformer-demo.phase-tokenize .tf-sequence {
  border-color: rgba(251, 191, 36, 0.38);
  box-shadow: inset 0 0 22px rgba(251, 191, 36, 0.045);
}
.transformer-demo.phase-tokenize .tf-raw-text {
  color: #fff7d6;
  background: rgba(251, 191, 36, 0.1);
  box-shadow: 0 0 18px rgba(251, 191, 36, 0.12);
}
.transformer-demo.phase-tokenize .tf-tokenizer-chip {
  border-color: rgba(251, 191, 36, 0.72);
  background: rgba(251, 191, 36, 0.14);
  box-shadow: 0 0 18px rgba(251, 191, 36, 0.16);
}
.transformer-demo.phase-tokenize .tf-mini-arrow {
  color: var(--tf-amber);
  text-shadow: 0 0 10px rgba(251, 191, 36, 0.55);
}
.transformer-demo.phase-tokenize .tf-seq-tokens {
  opacity: 0;
  transform: translateX(-0.7em) scale(0.96);
}
.tf-tokenizer-why {
  grid-column: 1 / -1;
  padding-top: 0.32em;
  border-top: 1px solid rgba(251, 191, 36, 0.14);
  color: #c5ced8;
  font-size: 0.8em;
  line-height: 1.35;
  transition: color 0.3s, border-color 0.3s, text-shadow 0.3s;
}
.tf-tokenizer-why b {
  margin-right: 0.55em;
  color: var(--tf-amber);
}
.transformer-demo.phase-tokenize .tf-tokenizer-why {
  border-color: rgba(251, 191, 36, 0.42);
  color: #fff4c7;
  text-shadow: 0 0 14px rgba(251, 191, 36, 0.14);
}
.tf-token {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.7em;
  padding: 0.24em 0.44em;
  border: 1px solid rgba(34, 211, 238, 0.3);
  border-radius: 6px;
  background: rgba(34, 211, 238, 0.08);
  color: #dffaff;
  font-weight: 700;
}
.tf-token.is-generated {
  border-color: rgba(74, 222, 128, 0.55);
  background: rgba(74, 222, 128, 0.13);
  color: #dfffe8;
}
.tf-token.is-new { animation: tfTokenPop 0.42s cubic-bezier(0.2, 0.9, 0.2, 1) both; }
.tf-cycle {
  margin-left: auto;
  color: var(--tf-green);
  font-size: 0.82em;
  opacity: 0;
  transform: translateX(-0.6em);
  transition: opacity 0.3s, transform 0.3s;
}
.transformer-demo.phase-picked .tf-cycle,
.transformer-demo.is-complete .tf-cycle { opacity: 1; transform: none; }

.tf-grid {
  min-height: 0;
  display: grid;
  grid-template-columns: 0.9fr 1.6em 1.3fr 1.6em 1fr;
  gap: 0.55em;
  align-items: stretch;
}
.tf-stage {
  min-width: 0;
  overflow: hidden;
  padding: 0.7em;
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: 10px;
  background: rgba(7, 12, 18, 0.72);
  transition: border-color 0.3s, box-shadow 0.3s, background 0.3s;
}
.tf-stage-head {
  display: flex;
  align-items: center;
  gap: 0.48em;
  margin-bottom: 0.65em;
  font-size: 0.92em;
}
.tf-stage-head span {
  color: var(--tf-cyan);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78em;
  letter-spacing: 0.08em;
}
.tf-stage-head b { color: #f4f7fa; }
.tf-stage-note {
  margin-top: 0;
  color: var(--chat-dim);
  font-size: 0.8em;
  line-height: 1.35;
}

.tf-embed-stage {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  gap: 0.35em;
}
.tf-embed-stage .tf-stage-head { margin-bottom: 0; }
.tf-vector-list {
  min-height: 0;
  overflow: hidden;
  display: grid;
  align-content: start;
  gap: 0.25em;
}
.tf-vector-row {
  display: grid;
  grid-template-columns: 2.8em repeat(5, 1fr);
  align-items: center;
  gap: 0.25em;
  min-height: 1.15em;
}
.tf-vector-row > span {
  overflow: hidden;
  color: #dffaff;
  font-size: 0.82em;
  font-weight: 700;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.tf-vector-row i {
  height: 0.88em;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--tf-cyan), #167d9c);
  opacity: var(--o);
  transform: scaleY(0.28);
  transition: transform 0.45s cubic-bezier(0.2, 0.8, 0.2, 1), opacity 0.45s;
}
.transformer-demo.phase-input .tf-vector-row i,
.transformer-demo.phase-attention .tf-vector-row i,
.transformer-demo.phase-predict .tf-vector-row i,
.transformer-demo.phase-picked .tf-vector-row i,
.transformer-demo.is-complete .tf-vector-row i { transform: scaleY(1); }
.transformer-demo.phase-input .tf-embed-stage {
  border-color: rgba(34, 211, 238, 0.65);
  box-shadow: 0 0 24px rgba(34, 211, 238, 0.12);
  background: rgba(15, 34, 44, 0.78);
}

.tf-core-stage { display: grid; grid-template-rows: auto 1fr auto; gap: 0.45em; }
.tf-core-stage .tf-stage-head { margin-bottom: 0.15em; }
.tf-layer {
  min-height: 0;
  padding: 0.5em 0.6em;
  border: 1px solid rgba(167, 139, 250, 0.18);
  border-radius: 8px;
  background: rgba(167, 139, 250, 0.045);
}
.tf-layer-name {
  display: flex;
  align-items: center;
  gap: 0.45em;
  margin-bottom: 0.38em;
  color: var(--tf-violet);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78em;
  font-weight: 700;
}
.tf-layer-name small { margin-left: 0.45em; color: var(--chat-dim); font-family: inherit; font-weight: 400; }
.tf-attn-list { display: flex; flex-direction: column; gap: 0.25em; }
.tf-attn-row { display: grid; grid-template-columns: 2.7em 1fr; align-items: center; gap: 0.35em; }
.tf-attn-row > span { color: #dbe4ec; font-size: 0.78em; font-weight: 600; }
.tf-attn-track {
  height: 0.55em;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
}
.tf-attn-fill {
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--tf-violet), var(--tf-cyan));
  box-shadow: 0 0 8px rgba(34, 211, 238, 0.55);
  transition: width 0.68s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.transformer-demo.phase-attention .tf-attn-fill,
.transformer-demo.phase-predict .tf-attn-fill,
.transformer-demo.phase-picked .tf-attn-fill,
.transformer-demo.is-complete .tf-attn-fill { width: var(--weight); }
.tf-context-chip {
  flex: none;
  width: max-content;
  margin-left: auto;
  padding: 0.2em 0.55em;
  border: 1px solid rgba(34, 211, 238, 0.28);
  border-radius: 999px;
  color: var(--tf-cyan);
  font-size: 0.96em;
  white-space: nowrap;
  opacity: 0.25;
  transform: scale(0.92);
  transition: opacity 0.35s, transform 0.35s;
}
.transformer-demo.phase-attention .tf-context-chip,
.transformer-demo.phase-predict .tf-context-chip,
.transformer-demo.phase-picked .tf-context-chip,
.transformer-demo.is-complete .tf-context-chip { opacity: 1; transform: none; }
.tf-ffn-layer { padding-block: 0.42em; }
.tf-ffn-layer .tf-layer-name { margin-bottom: 0.2em; }
.tf-neurons { display: flex; justify-content: center; gap: 0.45em; }
.tf-neurons i {
  width: 0.55em;
  height: 0.55em;
  border-radius: 50%;
  background: var(--tf-violet);
  opacity: 0.22;
}
.transformer-demo.phase-attention .tf-neurons i,
.transformer-demo.phase-predict .tf-neurons i,
.transformer-demo.phase-picked .tf-neurons i { animation: tfNeuron 0.9s ease-in-out infinite alternate; }
.tf-neurons i:nth-child(2n) { animation-delay: 0.15s !important; }
.tf-neurons i:nth-child(3n) { animation-delay: 0.3s !important; }
.transformer-demo.phase-attention .tf-core-stage {
  border-color: rgba(167, 139, 250, 0.65);
  box-shadow: 0 0 28px rgba(167, 139, 250, 0.12);
  background: rgba(31, 24, 53, 0.72);
}

.tf-prob-caption { margin-bottom: 0.42em; color: var(--chat-dim); font-size: 0.8em; }
.tf-prob-list { display: flex; flex-direction: column; gap: 0.42em; }
.tf-prob-row {
  display: grid;
  grid-template-columns: 2.1em 1fr 2.4em;
  align-items: center;
  gap: 0.35em;
  font-size: 0.82em;
}
.tf-prob-row > b { color: #f1f5f9; text-align: center; }
.tf-prob-row > span { color: var(--chat-dim); text-align: right; font-family: 'JetBrains Mono', monospace; font-size: 0.86em; }
.tf-prob-track { height: 0.65em; overflow: hidden; border-radius: 999px; background: rgba(255, 255, 255, 0.06); }
.tf-prob-fill {
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--tf-green), #0ea5a4);
  box-shadow: 0 0 8px rgba(74, 222, 128, 0.48);
  transition: width 0.7s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.transformer-demo.phase-predict .tf-prob-fill,
.transformer-demo.phase-picked .tf-prob-fill,
.transformer-demo.is-complete .tf-prob-fill { width: var(--prob); }
.transformer-demo.phase-predict .tf-prob-stage {
  border-color: rgba(74, 222, 128, 0.62);
  box-shadow: 0 0 26px rgba(74, 222, 128, 0.1);
  background: rgba(19, 46, 35, 0.7);
}
.tf-picked {
  margin-top: 0.68em;
  padding: 0.36em 0.55em;
  border: 1px solid rgba(251, 191, 36, 0.3);
  border-radius: 7px;
  background: rgba(251, 191, 36, 0.07);
  color: var(--chat-dim);
  text-align: center;
  opacity: 0.35;
  transform: translateY(0.35em);
  transition: opacity 0.3s, transform 0.3s, border-color 0.3s;
}
.tf-picked strong { margin-left: 0.35em; color: var(--tf-amber); font-size: 1.18em; }
.transformer-demo.phase-picked .tf-picked,
.transformer-demo.is-complete .tf-picked { opacity: 1; transform: none; border-color: rgba(251, 191, 36, 0.65); }

.tf-arrow { position: relative; display: flex; align-items: center; justify-content: center; color: var(--tf-cyan); }
.tf-arrow b { font-size: 1.35em; font-weight: 400; text-shadow: 0 0 12px rgba(34, 211, 238, 0.7); }
.tf-arrow i {
  position: absolute;
  width: 0.32em;
  height: 0.32em;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 9px var(--tf-cyan);
  animation: tfFlow 1.35s ease-in-out infinite;
}
.tf-output strong { color: #f8fafc; letter-spacing: 0.04em; }
.tf-caret { width: 0.12em; height: 1.15em; background: var(--tf-green); animation: tfCaret 0.82s steps(1) infinite; }
.tf-controls {
  display: flex;
  align-items: center;
  gap: 0.45em;
  margin-left: auto;
}
.tf-step-label {
  min-width: 10em;
  color: var(--chat-dim);
  font-size: 0.76em;
  text-align: right;
}
.tf-controls button {
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 6px;
  padding: 0.32em 0.72em;
  background: rgba(255, 255, 255, 0.06);
  color: var(--chat-ink);
  font: inherit;
  font-size: 0.78em;
  cursor: pointer;
}
.tf-controls .tf-next {
  border-color: rgba(34, 211, 238, 0.48);
  background: rgba(34, 211, 238, 0.13);
  color: #dffaff;
  font-weight: 700;
}
.tf-controls button:hover:not(:disabled),
.tf-controls button:focus-visible {
  border-color: var(--tf-cyan);
  outline: none;
  box-shadow: 0 0 12px rgba(34, 211, 238, 0.18);
}
.tf-controls button:disabled { cursor: default; opacity: 0.45; }
.static-mode .tf-controls { display: none; }

@keyframes tfTokenPop {
  from { opacity: 0; transform: translateY(0.45em) scale(0.78); }
  to { opacity: 1; transform: none; }
}
@keyframes tfNeuron {
  from { opacity: 0.25; transform: scale(0.72); box-shadow: none; }
  to { opacity: 1; transform: scale(1.12); box-shadow: 0 0 10px var(--tf-violet); }
}
@keyframes tfFlow {
  0% { opacity: 0; transform: translateX(-0.65em); }
  45% { opacity: 1; }
  100% { opacity: 0; transform: translateX(0.65em); }
}
@keyframes tfCaret { 50% { opacity: 0; } }
.static-mode .transformer-demo * { animation: none !important; transition: none !important; }

/* ---------- 对照表 ---------- */
table.vs { width: 100%; border-collapse: separate; border-spacing: 0; font-size: 0.66em; }
table.vs th, table.vs td { padding: 0.42em 0.8em; line-height: 1.5; }
table.vs thead th {
  color: var(--muted); font-weight: 600; font-size: 0.86em;
  border-bottom: 2px solid var(--line);
}
table.vs tbody td { border-bottom: 1px solid var(--line); }
table.vs tbody td:first-child { color: var(--ink-soft); }
table.vs tbody td:last-child { color: var(--accent-deep); font-weight: 700; }

/* ---------- 人设卡 / 主线句 ---------- */
.persona {
  background: var(--paper-raise);
  border: 1px solid var(--line);
  border-left: 6px solid var(--accent);
  border-radius: 12px;
  padding: 0.8em 1em;
  font-size: 0.78em;
  line-height: 1.7;
}
.persona b { color: var(--accent-deep); }
.persona .warn { color: var(--amber); font-weight: 700; }
.mainline {
  margin-top: 0.9em;
  text-align: center;
  font-size: 1.02em;
  font-weight: 800;
  line-height: 1.6;
}
.mainline .em { font-size: 1.06em; }

/* ---------- 授权边界条 ---------- */
.boundary {
  margin-top: 0.9em;
  background: var(--amber-soft);
  border: 1px dashed var(--amber);
  border-radius: 10px;
  padding: 0.5em 0.9em;
  font-size: 0.58em;
  color: var(--amber);
  font-weight: 600;
  line-height: 1.6;
}

/* ---------- 三层提示 ---------- */
.ladders { display: flex; flex-direction: column; gap: 0.5em; margin-top: 0.4em; }
.ladders .rung {
  display: flex; gap: 0.8em; align-items: flex-start;
  background: var(--paper-raise);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.55em 0.8em;
  font-size: 0.62em;
  line-height: 1.6;
}
.ladders .rung .lv {
  flex: none;
  font-family: 'JetBrains Mono', monospace;
  color: var(--accent);
  font-weight: 700;
  border: 1px solid var(--accent);
  border-radius: 8px;
  padding: 0.1em 0.5em;
  margin-top: 0.15em;
}
.ladders .rung .ask { color: var(--ink-soft); }
.ladders .rung .ask i { color: var(--muted); font-style: normal; }

/* ---------- 结尾二维码 ---------- */
.qr-row { display: flex; align-items: center; gap: 1em; justify-content: center; }
.qr-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px;
  width: 132px; height: 132px;
  display: flex; align-items: center; justify-content: center;
}
.qr-card svg { width: 110px; height: 110px; }
.url-line {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85em;
  font-weight: 700;
  color: var(--accent-deep);
}
.url-note { color: var(--muted); font-size: 0.55em; margin-top: 0.5em; line-height: 1.6; }

/* ---------- 挑战清单 ---------- */
.todos3 { display: flex; flex-direction: column; gap: 0.55em; margin-top: 0.5em; }
.todos3 .td {
  display: flex; gap: 0.8em; align-items: baseline;
  font-size: 0.68em; line-height: 1.6;
}
.todos3 .td .n {
  flex: none;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  color: var(--accent-deep);
  background: var(--accent-soft);
  border-radius: 8px;
  padding: 0.05em 0.5em;
}
.todos3 .td b { color: var(--ink); }
.todos3 .td small { color: var(--muted); }

/* ---------- 静态对话演示 ---------- */
.dialogue-wrap { display: block; }
.dialogue-wrap .chat {
  box-sizing: border-box;
  width: 100%;
  height: 23em;
  max-height: 23em;
}
.dialogue-wrap .chat .msg.fragment:not(.visible) { display: none; }
.static-mode .dialogue-wrap .chat { height: auto; max-height: none; }
.static-mode .dialogue-wrap .chat .msg.fragment { display: flex; }

/* ---------- fragment 微调 ---------- */
.reveal .slides section .fragment.fade-up { transform: translateY(24px); }
.reveal .slides section .fragment.fade-up.visible { transform: translateY(0); }