:root {
  color-scheme: light;
  /* 主题色 - 可修改任意色值 */
  --theme-primary: #007AFF;
  --theme-success: #34C759;
  --theme-warning: #FF9500;
  --theme-danger: #FF3B30;
  --theme-purple: #AF52DE;

  /* 浅色模式基础色 */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F5F5F7;
  --surface-primary: rgba(255, 255, 255, 0.92);
  --surface-secondary: rgba(255, 255, 255, 0.68);
  --separator: rgba(60, 60, 67, 0.12);
  --label-primary: #000000;
  --label-secondary: #3A3A3C;
  --label-tertiary: #6C6C70;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.04), 0 2px 4px rgba(0,0,0,0.02);
  --shadow-md: 0 8px 20px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.02);
}

html[data-theme="dark"] {
  color-scheme: dark;
  --theme-primary: #0A84FF;
  --theme-success: #30D158;
  --theme-warning: #FF9F0A;
  --theme-danger: #FF453A;
  --theme-purple: #BF5AF2;

  --bg-primary: #000000;
  --bg-secondary: #1C1C1E;
  --surface-primary: rgba(28,28,30,0.92);
  --surface-secondary: rgba(28,28,30,0.68);
  --separator: rgba(84,84,88,0.2);
  --label-primary: #FFFFFF;
  --label-secondary: #EBEBF5;
  --label-tertiary: #8E8E93;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.4);
  --shadow-md: 0 8px 20px rgba(0,0,0,0.6);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --theme-primary: #0A84FF;
    --theme-success: #30D158;
    --theme-warning: #FF9F0A;
    --theme-danger: #FF453A;
    --theme-purple: #BF5AF2;

    --bg-primary: #000000;
    --bg-secondary: #1C1C1E;
    --surface-primary: rgba(28,28,30,0.92);
    --surface-secondary: rgba(28,28,30,0.68);
    --separator: rgba(84,84,88,0.2);
    --label-primary: #FFFFFF;
    --label-secondary: #EBEBF5;
    --label-tertiary: #8E8E93;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.4);
    --shadow-md: 0 8px 20px rgba(0,0,0,0.6);
  }
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'SF Pro Display', system-ui;
  background: var(--bg-primary);
  color: var(--label-primary);
  overflow: hidden;
  height: 100vh;
}

.swiper-container { width: 100%; height: 100vh; }
.swiper-slide { overflow-y: auto; padding: 20px; }

/* 通用页面容器 */
.apple-page {
  min-height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
}

.apple-card {
  max-width: 1280px;
  width: 100%;
  margin: 0 auto;
  background: var(--surface-primary);
  backdrop-filter: blur(20px);
  border-radius: 28px;
  padding: 48px 40px;
  box-shadow: var(--shadow-md);
  border: 0.5px solid var(--separator);
}

/* 封面页 */
.cover { text-align: center; }

.cover h1 {
  font-size: 64px;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--label-primary), var(--theme-primary));
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
  margin-bottom: 16px;
}

.cover .subtitle {
  font-size: 28px;
  font-weight: 400;
  color: var(--label-secondary);
  margin-bottom: 24px;
}

.cover .description {
  font-size: 17px;
  color: var(--label-tertiary);
  max-width: 600px;
  margin: 0 auto 40px;
  line-height: 1.5;
}

.swipe-hint {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: var(--surface-secondary);
  border-radius: 999px;
  font-size: 15px;
  color: var(--label-secondary);
}

/* 目录页 */
.directory-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 24px;
}

.dir-item {
  background: var(--surface-secondary);
  backdrop-filter: blur(20px);
  border-radius: 24px;
  padding: 28px;
  border: 0.5px solid var(--separator);
  cursor: pointer;
  transition: all 0.3s ease;
}

.dir-item:hover {
  transform: translateY(-4px);
  background: var(--surface-primary);
  box-shadow: var(--shadow-md);
}

.dir-icon { font-size: 40px; margin-bottom: 16px; }
.dir-title { font-size: 24px; font-weight: 600; margin-bottom: 8px; }
.dir-desc { font-size: 15px; color: var(--label-tertiary); line-height: 1.4; }

/* 章节封面页 */
.chapter-cover { text-align: center; }

.chapter-number {
  font-size: 17px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--theme-primary);
  margin-bottom: 16px;
}

.chapter-title {
  font-size: 48px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 24px;
}

.chapter-desc {
  font-size: 21px;
  font-weight: 400;
  color: var(--label-secondary);
  max-width: 700px;
  margin: 0 auto;
  line-height: 1.4;
}

/* 通用内容样式 */
.content-title {
  font-size: 34px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 16px;
}

.title-accent {
  color: var(--theme-primary);
}

.content-sub {
  font-size: 17px;
  color: var(--label-secondary);
  margin-bottom: 32px;
}

/* 分栏布局 */
.two-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.three-columns { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 28px; }

/* 卡片式 */
.card {
  background: var(--surface-secondary);
  border-radius: 24px;
  padding: 24px;
  border: 0.5px solid var(--separator);
  transition: all 0.2s;
}

.card h3 { font-size: 22px; font-weight: 600; margin-bottom: 12px; }
.card p { font-size: 15px; color: var(--label-tertiary); line-height: 1.4; }

.card:hover {
  transform: translateY(-2px);
  background: var(--surface-primary);
  box-shadow: var(--shadow-sm);
}

/* 讲解态悬停工具类 */
.presentation-hover-page {
  isolation: isolate;
}

.presentation-hover-target,
.presentation-hover-row td {
  transition:
    transform 0.22s ease,
    box-shadow 0.22s ease,
    border-color 0.22s ease,
    background 0.22s ease,
    opacity 0.22s ease,
    filter 0.22s ease,
    color 0.22s ease;
}

.presentation-hover-page.presentation-hover-active .presentation-hover-target {
  opacity: 0.42;
  filter: saturate(0.72) brightness(0.88);
  transform: scale(0.988);
}

.presentation-hover-page.presentation-hover-active .presentation-hover-target.presentation-hover-current {
  opacity: 1;
  filter: saturate(1.12) brightness(1.08);
  transform: translateY(-4px) scale(1.01);
  z-index: 6;
  border-color: color-mix(in srgb, var(--theme-primary) 42%, var(--separator));
  background: color-mix(in srgb, var(--theme-primary) 16%, var(--surface-primary));
  box-shadow:
    0 0 0 1px color-mix(in srgb, var(--theme-primary) 22%, transparent),
    0 18px 34px color-mix(in srgb, var(--theme-primary) 16%, transparent),
    var(--shadow-md);
}

.presentation-hover-page.presentation-hover-active .presentation-hover-target.presentation-hover-related {
  opacity: 0.92;
  filter: saturate(1.02) brightness(1.02);
  transform: translateY(-2px) scale(1.004);
  z-index: 5;
  border-color: color-mix(in srgb, var(--theme-primary) 30%, var(--separator));
  background: color-mix(in srgb, var(--theme-primary) 10%, var(--surface-primary));
  box-shadow:
    0 0 0 1px color-mix(in srgb, var(--theme-primary) 14%, transparent),
    0 12px 24px color-mix(in srgb, var(--theme-primary) 10%, transparent),
    var(--shadow-sm);
}

.presentation-hover-page:has(.presentation-hover-row:hover) .presentation-hover-row td {
  opacity: 0.42;
  filter: saturate(0.72) brightness(0.88);
  background: color-mix(in srgb, var(--surface-primary) 82%, transparent);
}

.presentation-hover-page:has(.presentation-hover-row:hover) .presentation-hover-row:hover td {
  opacity: 1;
  filter: none;
  color: var(--label-primary);
  background: color-mix(in srgb, var(--theme-primary) 18%, var(--surface-primary));
  box-shadow:
    inset 0 0 0 1px color-mix(in srgb, var(--theme-primary) 28%, transparent),
    0 12px 24px color-mix(in srgb, var(--theme-primary) 14%, transparent);
}

/* 列表式 */
.apple-list { list-style: none; }

.apple-list li {
  padding: 16px 0;
  border-bottom: 0.5px solid var(--separator);
  font-size: 17px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.apple-list li:last-child { border-bottom: none; }

.list-bullet {
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: var(--theme-primary);
  margin-top: 8px;
  flex-shrink: 0;
}

/* 结构图式 */
.structure { display: flex; flex-direction: column; gap: 24px; }

.structure-node {
  background: var(--surface-secondary);
  border-radius: 20px;
  padding: 20px;
  border-left: 4px solid var(--theme-primary);
}

.structure-node h4 { font-size: 18px; font-weight: 600; margin-bottom: 8px; }

.structure-children {
  margin-top: 16px;
  padding-left: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  border-left: 1px dashed var(--separator);
}

.structure-child {
  padding: 12px 16px;
  background: rgba(0,0,0,0.03);
  border-radius: 16px;
  font-size: 15px;
}

html[data-theme="dark"] .structure-child {
  background: rgba(255,255,255,0.05);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .structure-child { background: rgba(255,255,255,0.05); }
}

/* 对话式 */
.dialogue { display: flex; flex-direction: column; gap: 24px; }
.dialogue-item { display: flex; gap: 16px; }

.dialogue-avatar {
  width: 48px;
  height: 48px;
  border-radius: 999px;
  background: var(--theme-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
  flex-shrink: 0;
}

.dialogue-bubble {
  background: var(--surface-secondary);
  border-radius: 24px;
  padding: 16px 20px;
  max-width: 80%;
  border: 0.5px solid var(--separator);
}

.dialogue-name {
  font-weight: 600;
  font-size: 15px;
  margin-bottom: 6px;
  color: var(--theme-primary);
}

.dialogue-text { font-size: 16px; line-height: 1.4; }
.dialogue-item.right { flex-direction: row-reverse; }
.dialogue-item.right .dialogue-bubble { background: var(--theme-primary); color: white; }
.dialogue-item.right .dialogue-name { color: white; }

/* 时间线 */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: relative;
  padding-left: 30px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 9px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: var(--separator);
}

.timeline-item { position: relative; padding-left: 32px; }

.timeline-item::before {
  content: '';
  position: absolute;
  left: -21px;
  top: 8px;
  width: 12px;
  height: 12px;
  border-radius: 999px;
  background: var(--theme-primary);
  border: 2px solid var(--bg-primary);
  box-shadow: 0 0 0 2px var(--theme-primary);
}

.timeline-date {
  font-weight: 600;
  font-size: 17px;
  color: var(--theme-primary);
  margin-bottom: 6px;
}

.timeline-title { font-size: 18px; font-weight: 600; margin-bottom: 8px; }
.timeline-desc { font-size: 15px; color: var(--label-tertiary); line-height: 1.4; }

/* 横向时间线 */
.timeline-horizontal {
  position: relative;
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 14px;
  align-items: start;
  min-height: 0;
  overflow: visible;
  padding: 4px 18px 0 0;
  list-style: none;
}

.timeline-horizontal::before {
  content: "";
  position: absolute;
  left: 34px;
  right: 54px;
  top: 50%;
  height: 4px;
  transform: translateY(-50%);
  border-radius: 999px;
  background: linear-gradient(
    90deg,
    color-mix(in srgb, var(--theme-primary) 54%, var(--separator)) 0%,
    var(--theme-primary) 50%,
    color-mix(in srgb, var(--theme-primary) 54%, var(--separator)) 100%
  );
  box-shadow:
    0 0 0 1px color-mix(in srgb, var(--theme-primary) 22%, var(--separator)),
    0 8px 18px color-mix(in srgb, var(--theme-primary) 16%, transparent);
  z-index: 0;
}

.timeline-horizontal::after {
  content: "";
  position: absolute;
  right: 26px;
  top: 50%;
  width: 16px;
  height: 16px;
  border-top: 4px solid var(--theme-primary);
  border-right: 4px solid var(--theme-primary);
  transform: translateY(-50%) rotate(45deg);
  z-index: 1;
}

.timeline-horizontal-item {
  position: relative;
  display: grid;
  grid-template-rows: 1fr 34px 30px;
  gap: 0;
  align-items: start;
  z-index: 1;
}

.timeline-horizontal-card {
  width: 100%;
  height: 230px;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 10px;
  background: var(--surface-secondary);
  border: 0.5px solid var(--separator);
  border-radius: 24px;
  padding: 16px 14px 14px;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(20px);
}

.timeline-horizontal-title {
  font-size: 16px;
  line-height: 1.32;
  font-weight: 700;
  color: var(--label-primary);
}

.timeline-horizontal-content {
  display: grid;
  align-content: start;
  gap: 6px;
  font-size: 14px;
  line-height: 1.42;
  color: var(--label-secondary);
}

.timeline-horizontal-author {
  font-size: 12px;
  line-height: 1.2;
  color: var(--label-tertiary);
}

.timeline-horizontal-node {
  align-self: center;
  justify-self: center;
  width: 20px;
  height: 20px;
  border-radius: 999px;
  background: var(--theme-primary);
  border: 4px solid var(--bg-primary);
  box-shadow:
    0 0 0 5px color-mix(in srgb, var(--theme-primary) 16%, transparent),
    0 0 14px color-mix(in srgb, var(--theme-primary) 22%, transparent);
  z-index: 2;
}

.timeline-horizontal-date {
  align-self: start;
  justify-self: center;
  margin-top: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--theme-primary);
  opacity: 0.9;
  text-align: center;
  line-height: 1.1;
}

/* 对比表 */
.comparison { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }

.comparison-col {
  background: var(--surface-secondary);
  border-radius: 24px;
  padding: 24px;
  border: 0.5px solid var(--separator);
}

.comparison-col h3 {
  font-size: 22px;
  font-weight: 600;
  text-align: center;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--theme-primary);
  margin-bottom: 20px;
}

.comparison-row {
  display: flex;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 0.5px solid var(--separator);
}

.comparison-label { font-weight: 500; }
.comparison-value { color: var(--label-tertiary); }

/* 步骤流程 */
.step-flow { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

.step {
  flex: 1;
  min-width: 180px;
  text-align: center;
  background: var(--surface-secondary);
  border-radius: 24px;
  padding: 24px 16px;
  position: relative;
}

.step-number {
  width: 40px;
  height: 40px;
  background: var(--theme-primary);
  color: white;
  border-radius: 999px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 20px;
  margin: 0 auto 16px;
}

.step-title { font-weight: 600; font-size: 18px; margin-bottom: 8px; }
.step-desc { font-size: 14px; color: var(--label-tertiary); }

.step:not(:last-child)::after {
  content: '→';
  position: absolute;
  right: -20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 24px;
  color: var(--separator);
}

@media (max-width: 768px) {
  .step:not(:last-child)::after { display: none; }
}

/* 引用块/高亮块 */
.callout {
  background: var(--surface-secondary);
  border-radius: 20px;
  padding: 20px 24px;
  border-left: 4px solid var(--theme-primary);
  margin: 24px 0;
}

.callout p {
  font-size: 17px;
  font-style: italic;
  color: var(--label-secondary);
  margin-bottom: 8px;
}

.callout-author { font-size: 14px; color: var(--label-tertiary); text-align: right; }

.highlight {
  background: rgba(0, 122, 255, 0.12);
  border-radius: 20px;
  padding: 20px;
  border: 0.5px solid rgba(0, 122, 255, 0.3);
}

.highlight.warning {
  background: rgba(255, 149, 0, 0.12);
  border-color: rgba(255, 149, 0, 0.3);
}

.highlight.success {
  background: rgba(52, 199, 89, 0.12);
  border-color: rgba(52, 199, 89, 0.3);
}

/* 指标卡片 */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 24px;
}

.metric-card {
  background: var(--surface-secondary);
  border-radius: 24px;
  padding: 24px;
  text-align: center;
  border: 0.5px solid var(--separator);
}

.metric-value {
  font-size: 48px;
  font-weight: 700;
  color: var(--theme-primary);
  line-height: 1;
  margin-bottom: 8px;
}

.metric-label { font-size: 15px; color: var(--label-tertiary); }

/* 折叠面板 */
.accordion { border-radius: 20px; overflow: hidden; }
.accordion-item { border-bottom: 0.5px solid var(--separator); }

.accordion-header {
  padding: 18px 20px;
  font-weight: 600;
  font-size: 18px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--surface-secondary);
  transition: 0.2s;
}

.accordion-header:hover { background: var(--surface-primary); }
.accordion-icon { font-size: 20px; transition: transform 0.3s; }
.accordion-item.open .accordion-icon { transform: rotate(180deg); }

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  background: var(--surface-primary);
  padding: 0 20px;
}

.accordion-item.open .accordion-content {
  max-height: 500px;
  padding: 20px;
}

/* 网格图库 */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}

.gallery-item {
  background: var(--surface-secondary);
  border-radius: 24px;
  overflow: hidden;
  border: 0.5px solid var(--separator);
  transition: 0.2s;
}

.gallery-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.gallery-image {
  width: 100%;
  height: 160px;
  background: linear-gradient(135deg, var(--surface-primary), var(--separator));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 48px;
}

.gallery-caption { padding: 16px; }
.gallery-title { font-weight: 600; margin-bottom: 6px; }
.gallery-desc { font-size: 13px; color: var(--label-tertiary); }

/* 导航控件 */
.nav-button {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  background: var(--surface-secondary);
  backdrop-filter: blur(20px);
  border-radius: 999px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border: 0.5px solid var(--separator);
  color: var(--theme-primary);
  transition: 0.2s;
  z-index: 10;
}

.nav-button:hover { background: var(--theme-primary); color: white; }
.nav-prev { left: 20px; }
.nav-next { right: 20px; }

.pagination {
  position: absolute;
  bottom: 20px;
  left: 0;
  right: 0;
  display: flex;
  justify-content: center;
  gap: 8px;
}

.pagination .dot {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--label-tertiary);
  transition: 0.2s;
}

.pagination .dot.active {
  width: 24px;
  background: var(--theme-primary);
}

/* 响应式 */
@media (max-width: 768px) {
  .apple-card { padding: 32px 24px; }
  .cover h1 { font-size: 44px; }
  .cover .subtitle { font-size: 22px; }
  .chapter-title { font-size: 34px; }
  .two-columns, .three-columns, .comparison { grid-template-columns: 1fr; }
  .nav-button { width: 40px; height: 40px; }
  .nav-prev { left: 10px; }
  .nav-next { right: 10px; }
  .dialogue-bubble { max-width: 90%; }
  .step-flow { flex-direction: column; }
  .step:not(:last-child)::after { display: none; }

  .timeline-horizontal {
    grid-template-columns: 1fr;
    gap: 18px;
    padding: 0;
  }

  .timeline-horizontal::before,
  .timeline-horizontal::after {
    display: none;
  }

  .timeline-horizontal-item {
    grid-template-rows: auto auto auto;
    gap: 12px;
  }

  .timeline-horizontal-card {
    height: auto;
  }

  .timeline-horizontal-node {
    justify-self: start;
    width: 16px;
    height: 16px;
  }

  .timeline-horizontal-date {
    justify-self: start;
    text-align: left;
    margin-top: 0;
  }
}