/* =========================================================
   AI Start · Poster Theme
   大字报风格主题（基于 Reveal.js 5）
   注意：Reveal 默认舞台 960×700。一律使用 em，避免 vw/vh
   导致内容跑出舞台边界。
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;700;900&family=JetBrains+Mono:wght@400;700&family=Noto+Sans+SC:wght@400;700;900&display=swap');

:root {
  --poster-accent: #FF3366;
  --poster-bg: #0a0a0a;
  --poster-fg: #ffffff;
  --poster-mute: #888;
  --poster-code-bg: #1a1a1a;
  --poster-font-zh: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --poster-font-en: 'Inter', system-ui, sans-serif;
  --poster-font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
}

/* === 全局基底 === */
.reveal {
  font-family: var(--poster-font-en), var(--poster-font-zh);
  font-weight: 500;
  background: var(--poster-bg);
  color: var(--poster-fg);
  letter-spacing: -0.01em;
}

.reveal .slides {
  text-align: left;
}

/* 让每张 section 自己管理布局，并强制内容不溢出 */
.reveal .slides > section,
.reveal .slides > section > section {
  height: 100%;
  width: 100%;
  padding: 1.4em 1.6em;
  display: flex !important;
  flex-direction: column;
  justify-content: center;
  box-sizing: border-box;
  overflow: hidden;          /* 兜底防止内容溢出 */
}

.reveal section {
  font-size: 30px;            /* 基准字号，所有 em 相对于此 */
  line-height: 1.4;
}

.reveal section > * {
  max-width: 100%;
}

/* === 标题 === */
.reveal h1, .reveal h2, .reveal h3, .reveal h4 {
  font-family: var(--poster-font-en), var(--poster-font-zh);
  font-weight: 900;
  text-transform: none;
  margin: 0;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--poster-fg);
  word-break: break-word;
  overflow-wrap: break-word;
}

.reveal h1 { font-size: 4.6em; }
.reveal h2 { font-size: 3em; }
.reveal h3 { font-size: 2em; }
.reveal h4 { font-size: 1.4em; }

/* === 段落 / 列表 === */
.reveal p {
  margin: 0.5em 0;
  font-size: 1em;
}

.reveal ul, .reveal ol {
  display: block;
  margin: 0.5em 0;
  padding-left: 1em;
}

.reveal li {
  margin: 0.25em 0;
}

/* === 重点元素 === */
.reveal strong, .reveal b {
  color: var(--poster-accent);
  font-weight: 900;
}

.reveal em {
  color: var(--poster-accent);
  font-style: normal;
  font-weight: 700;
}

.reveal a {
  color: var(--poster-accent);
  text-decoration: underline;
}

/* === 代码 === */
.reveal code {
  font-family: var(--poster-font-mono);
  background: var(--poster-code-bg);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  font-size: 0.85em;
}

.reveal pre {
  width: 100%;
  font-size: 0.55em;
  margin: 0.5em 0;
  box-shadow: 0 4px 24px rgba(0,0,0,0.4);
  border-radius: 8px;
}

.reveal pre code {
  display: block;
  padding: 1em;
  background: var(--poster-code-bg);
  font-family: var(--poster-font-mono);
  line-height: 1.5;
  max-height: 100%;
  border-radius: 8px;
  overflow: auto;
  white-space: pre;
}

/* === 引用 === */
.reveal blockquote {
  background: transparent;
  border-left: 0.4em solid var(--poster-accent);
  padding: 0.4em 1em;
  margin: 0.8em 0;
  font-style: italic;
  font-size: 1.15em;
  box-shadow: none;
}

/* === 表格 === */
.reveal table {
  margin: 0.5em auto;
  border-collapse: collapse;
  font-size: 0.7em;
  width: 100%;
}

.reveal table th,
.reveal table td {
  padding: 0.35em 0.7em;
  border-bottom: 1px solid #333;
  text-align: left;
}

.reveal table th {
  color: var(--poster-accent);
  font-weight: 900;
  border-bottom: 3px solid var(--poster-accent);
}

/* =========================================================
   大字报版式：Slide Templates
   尺度全部基于 em（约 30px 基准），保证不溢出舞台
   ========================================================= */

/* --- 封面页 cover --- */
.reveal section.cover {
  background: var(--poster-bg);
}
.reveal section.cover h1 {
  font-size: 5.2em;
  line-height: 0.95;
  color: var(--poster-fg);
}
.reveal section.cover h1 .accent {
  color: var(--poster-accent);
}
.reveal section.cover .episode {
  font-family: var(--poster-font-mono);
  font-size: 1.1em;
  color: var(--poster-accent);
  letter-spacing: 0.2em;
  margin-bottom: 0.6em;
  text-transform: uppercase;
}
.reveal section.cover .slogan {
  font-size: 1.2em;
  color: var(--poster-mute);
  margin-top: 0.8em;
  font-weight: 500;
}

/* --- 巨大标题页 hero --- */
.reveal section.hero h1 {
  font-size: 5.8em;
  line-height: 0.92;
  color: var(--poster-accent);
}
.reveal section.hero p {
  font-size: 1.4em;
  margin-top: 0.8em;
  color: var(--poster-fg);
}

/* --- 数字页 number --- */
.reveal section.number {
  text-align: center;
  align-items: center;
}
.reveal section.number .num {
  font-size: 9em;
  font-weight: 900;
  line-height: 1;
  color: var(--poster-accent);
  font-family: var(--poster-font-en);
}
.reveal section.number .label {
  font-size: 1.6em;
  color: var(--poster-fg);
  margin-top: 0.3em;
}

/* --- 金句页 quote --- */
.reveal section.quote {
  position: relative;
  text-align: left;
}
.reveal section.quote::before {
  content: '"';
  position: absolute;
  top: -0.1em;
  left: 0.2em;
  font-size: 14em;
  color: var(--poster-accent);
  opacity: 0.18;
  line-height: 1;
  font-family: 'Inter', sans-serif;
  font-weight: 900;
  pointer-events: none;
}
.reveal section.quote .saying {
  position: relative;
  font-size: 2.6em;
  line-height: 1.1;
  font-weight: 900;
  color: var(--poster-fg);
}
.reveal section.quote .author {
  position: relative;
  font-size: 1.1em;
  margin-top: 0.6em;
  color: var(--poster-mute);
}
.reveal section.quote .author::before {
  content: '— ';
}

/* --- 过渡章节页 chapter --- */
.reveal section.chapter .ch-num {
  font-family: var(--poster-font-mono);
  font-size: 1.2em;
  color: var(--poster-accent);
  letter-spacing: 0.2em;
}
.reveal section.chapter h2 {
  font-size: 5em;
  margin-top: 0.2em;
  color: var(--poster-fg);
  line-height: 0.95;
}

/* --- 列表页 list --- */
.reveal section.list h2 {
  font-size: 2em;
  color: var(--poster-accent);
  margin-bottom: 0.4em;
}
.reveal section.list ul {
  list-style: none;
  padding: 0;
}
.reveal section.list ul li {
  font-size: 1.05em;
  padding: 0.25em 0;
  border-bottom: 2px solid #222;
  display: flex;
  align-items: flex-start;
}
.reveal section.list ul li::before {
  content: '→';
  color: var(--poster-accent);
  font-weight: 900;
  margin-right: 0.5em;
  font-size: 1em;
  flex-shrink: 0;
}

/* --- 对比页 vs --- */
.reveal section.vs h2 {
  font-size: 1.8em;
  text-align: center;
  margin-bottom: 0.4em;
}
.reveal section.vs .vs-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1em;
  align-items: stretch;
}
.reveal section.vs .vs-side {
  padding: 0.8em;
  border: 3px solid #333;
  border-radius: 10px;
}
.reveal section.vs .vs-side.left { border-color: var(--poster-accent); }
.reveal section.vs .vs-side.right { border-color: var(--poster-fg); }
.reveal section.vs .vs-side h3 {
  font-size: 1.4em;
  margin-bottom: 0.3em;
}
.reveal section.vs .vs-side ul {
  list-style: none;
  padding: 0;
  font-size: 0.85em;
  margin: 0;
}
.reveal section.vs .vs-side li {
  padding: 0.15em 0;
}
.reveal section.vs .vs-mark {
  font-size: 2.6em;
  font-weight: 900;
  color: var(--poster-accent);
  align-self: center;
  text-align: center;
}

/* --- 终端代码页 terminal --- */
.reveal section.terminal {
  background: #000;
}
.reveal section.terminal h2 {
  color: #00FF88;
  font-family: var(--poster-font-mono);
  font-size: 1.4em;
  margin-bottom: 0.5em;
}
.reveal section.terminal h2::before {
  content: '$ ';
  color: var(--poster-accent);
}

/* --- 总结页 summary --- */
.reveal section.summary h2 {
  font-size: 2.4em;
  color: var(--poster-accent);
  margin-bottom: 0.4em;
}
.reveal section.summary .keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4em;
  margin: 0.6em 0;
}
.reveal section.summary .kw {
  font-size: 1em;
  font-weight: 900;
  background: var(--poster-accent);
  color: #000;
  padding: 0.25em 0.7em;
  border-radius: 999px;
}
.reveal section.summary .next {
  font-size: 1.1em;
  margin-top: 1em;
  color: var(--poster-mute);
}
.reveal section.summary .next strong {
  color: var(--poster-fg);
}

/* =========================================================
   每课主题色覆盖
   ========================================================= */

body.lesson-01 { --poster-accent: #FF3366; --poster-bg: #0a0a0a; }
body.lesson-02 { --poster-accent: #00D9FF; --poster-bg: #001428; }
body.lesson-03 { --poster-accent: #FFD93D; --poster-bg: #1a0d2e; }
body.lesson-04 { --poster-accent: #06FFA5; --poster-bg: #000000; }
body.lesson-05 { --poster-accent: #FF6B35; --poster-bg: #1a1410; }
body.lesson-06 { --poster-accent: #C084FC; --poster-bg: #0f0a1a; }
body.lesson-07 { --poster-accent: #EC4899; --poster-bg: #0a0a0a; }
body.lesson-08 { --poster-accent: #A78BFA; --poster-bg: #0c0a1f; }
body.lesson-09 { --poster-accent: #10B981; --poster-bg: #050a08; }
body.lesson-10 { --poster-accent: #DC2626; --poster-bg: #0a0a0a; }
body.lesson-11 { --poster-accent: #FACC15; --poster-bg: #0a0a0a; }

/* === 控件颜色 === */
.reveal .controls {
  color: var(--poster-accent);
}
.reveal .progress {
  color: var(--poster-accent);
  height: 6px;
}
.reveal .slide-number {
  font-family: var(--poster-font-mono);
  background: transparent;
  font-size: 16px;
  color: var(--poster-mute);
}

/* === Fragment 动效微调 === */
.reveal .fragment.scale-up {
  opacity: 0;
  transform: scale(0.6);
  transition: all 0.5s ease;
}
.reveal .fragment.scale-up.visible {
  opacity: 1;
  transform: scale(1);
}

/* === 工具类 === */
.reveal .accent { color: var(--poster-accent); }
.reveal .mute { color: var(--poster-mute); }
.reveal .mono { font-family: var(--poster-font-mono); }
.reveal .huge { font-size: 1.4em; }
.reveal .xhuge { font-size: 2em; font-weight: 900; }
.reveal .tag {
  display: inline-block;
  padding: 0.15em 0.5em;
  background: var(--poster-accent);
  color: #000;
  font-weight: 900;
  border-radius: 6px;
  font-size: 0.7em;
  margin-right: 0.4em;
  vertical-align: middle;
}

/* === 网格 === */
.reveal .grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1em;
}
.reveal .grid-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0.8em;
}
.reveal .grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.6em;
}

/* === 卡片 === */
.reveal .card {
  padding: 0.8em;
  border: 3px solid var(--poster-accent);
  border-radius: 10px;
  background: rgba(255,255,255,0.02);
}
.reveal .card h4 {
  color: var(--poster-accent);
  font-size: 1.1em;
  margin-bottom: 0.3em;
}
.reveal .card p {
  font-size: 0.7em;
  margin: 0;
  color: var(--poster-mute);
}

/* === 顶部回到门户 === */
.home-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  font-family: var(--poster-font-mono);
  font-size: 12px;
  color: var(--poster-accent);
  text-decoration: none;
  padding: 4px 10px;
  border: 2px solid var(--poster-accent);
  border-radius: 6px;
  background: rgba(0,0,0,0.5);
  letter-spacing: 0.1em;
}
.home-link:hover {
  background: var(--poster-accent);
  color: #000;
}