/* ==========================================================================
   拼好连机场 · 第3套视觉主题：“接片分镜系统” (Interlocking Storyboard System)
   纯原生 CSS · 暖白连续阅读风 · 移动端优先
   ========================================================================== */

:root {
  /* 核心色彩变量 (Rule 17 & 255) */
  --bg: #FBFAF7;
  --surface: #FFFFFF;
  --surface-alt: #F1F0EB;
  --text: #202527;
  --text-body: #5C6467;
  --muted: #888F91;
  --blue: #425B66;
  --blue-dark: #334A53;
  --green: #607067;
  --green-dark: #4B5A52;
  --warm: #A67B58;
  --accent: #B26C4E;
  --surface-blue: #EDF1F2;
  --surface-green: #EEF1EE;
  --surface-warm: #F5EEE7;
  --border: #E1DED8;
  --footer-text: #4C5558;

  /* 排版与尺寸变量 (Rule 21) */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  --container-max: 1180px;
  --article-max: 800px;
  --header-height: 68px;
  --radius-sm: 2px;
  --radius-md: 4px;
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--bg);
  color: var(--text-body);
  font-family: var(--font-sans);
  line-height: 1.8;
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
}

body {
  background-color: var(--bg);
  color: var(--text-body);
  font-size: 1rem;
  line-height: 1.8;
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
  display: block;
}

/* 可访问性焦点样式 (Rule 252) */
a:focus-visible,
button:focus-visible,
summary:focus-visible,
input:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
}

a {
  color: var(--blue);
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

a:hover {
  color: var(--blue-dark);
}

ul, ol {
  list-style: none;
}

h1, h2, h3, h4 {
  color: var(--text);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

/* 容器布局 (Rule 224) */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}

@media (min-width: 768px) {
  .container {
    padding-left: 36px;
    padding-right: 36px;
  }
}

/* ==========================================================================
   Header & Navigation (Rule 26-29)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  min-height: var(--header-height);
  background-color: var(--bg);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 20px;
  min-height: var(--header-height);
  gap: 16px;
}

@media (min-width: 768px) {
  .header-inner {
    padding: 0 36px;
  }
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  text-decoration: none;
  flex-shrink: 0;
}

.brand-logo {
  width: 40px;
  height: 36px;
  display: block;
  flex-shrink: 0;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.brand-name {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.01em;
}

.brand-sub {
  font-size: 0.75rem;
  color: var(--muted);
  margin-top: 2px;
}

/* Desktop Nav */
.main-nav {
  display: none;
}

@media (min-width: 1080px) {
  .main-nav {
    display: flex;
    align-items: center;
    gap: 18px;
  }
}

.nav-link {
  font-size: 0.9rem;
  color: var(--text-body);
  padding: 6px 2px;
  position: relative;
  white-space: nowrap;
  font-weight: 500;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 2px;
  background-color: var(--blue);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-cta {
  display: none;
  align-items: center;
  gap: 6px;
  background-color: var(--blue);
  color: #FFFFFF;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--blue);
  white-space: nowrap;
}

.header-cta:hover {
  background-color: var(--blue-dark);
  border-color: var(--blue-dark);
  color: #FFFFFF;
}

@media (min-width: 768px) {
  .header-cta {
    display: inline-flex;
  }
}

/* Mobile Menu Button */
.menu-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 7px 14px;
  font-size: 0.875rem;
  font-family: inherit;
  font-weight: 500;
  cursor: pointer;
}

.menu-toggle:hover {
  border-color: var(--blue);
  color: var(--blue);
}

@media (min-width: 1080px) {
  .menu-toggle {
    display: none;
  }
}

/* Mobile Navigation Drawer / Panel (Rule 29 & 194) */
.mobile-nav-panel {
  background-color: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 16px 20px 20px;
}

/* 仅当 JS 启用时默认收起移动菜单；JS 关闭时依然可访问 (Rule 194) */
.js-enabled .mobile-nav-panel {
  display: none;
}

.js-enabled .mobile-nav-panel.is-open {
  display: block;
}

@media (min-width: 1080px) {
  .mobile-nav-panel,
  .js-enabled .mobile-nav-panel.is-open {
    display: none;
  }
}

.mobile-nav-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px 16px;
  margin-bottom: 16px;
}

.mobile-nav-list a {
  display: block;
  padding: 8px 10px;
  font-size: 0.9375rem;
  color: var(--text);
  border-bottom: 1px solid var(--surface-alt);
}

.mobile-nav-list a:hover {
  color: var(--blue);
  background-color: var(--bg);
}

.mobile-nav-cta {
  display: block;
  text-align: center;
  background-color: var(--blue);
  color: #FFFFFF;
  padding: 10px 16px;
  font-size: 0.9375rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
}

.mobile-nav-cta:hover {
  background-color: var(--blue-dark);
  color: #FFFFFF;
}

/* ==========================================================================
   “接片分镜系统”核心章节片结构 (Rule 3-9, 19, 44-49, 224-225, 257)
   ========================================================================== */
.chapter-slice {
  position: relative;
  padding: 56px 0 64px;
  border-bottom: 1px solid var(--border);
}

@media (min-width: 768px) {
  .chapter-slice {
    padding: 76px 0 88px;
  }
}

/* 各章节片固定背景节奏 (Rule 19) */
.slice-bg-warm-white {
  background-color: var(--bg); /* #FBFAF7 */
}

.slice-bg-white {
  background-color: var(--surface); /* #FFFFFF */
}

.slice-bg-alt {
  background-color: var(--surface-alt); /* #F1F0EB */
}

.slice-bg-green {
  background-color: var(--surface-green); /* #EEF1EE */
}

.slice-bg-warm {
  background-color: var(--surface-warm); /* #F5EEE7 */
}

.slice-bg-blue {
  background-color: var(--surface-blue); /* #EDF1F2 */
}

/* 章节底部与下一章节顶部的几何轻微接片 (Rule 3-5, 47-49, 225, 257)
   Desktop: 12px-18px 矩形阶梯错层；Mobile: 6px-8px 轻微切口，绝不溢出屏幕 */
.chapter-slice::after {
  content: "";
  position: absolute;
  bottom: -7px;
  height: 7px;
  width: 72px;
  background-color: inherit;
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  z-index: 3;
  pointer-events: none;
  transition: transform 0.2s ease;
}

@media (min-width: 768px) {
  .chapter-slice::after {
    bottom: -15px;
    height: 15px;
    width: 136px;
  }
}

/* 接片位置错落变化，形成纵向阅读节奏 (Rule 48) */
.joint-pos-right::after {
  right: 10%;
}

.joint-pos-left::after {
  left: 9%;
}

.joint-pos-center-right::after {
  left: 56%;
}

.joint-pos-left-center::after {
  left: 24%;
}

.joint-pos-right-center::after {
  right: 22%;
}

.joint-pos-center::after {
  left: 44%;
}

/* 章节头部编号与大标题结构 (Rule 9, 21, 45, 224) */
.slice-header {
  margin-bottom: 36px;
  max-width: 860px;
}

.slice-meta-row {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 10px;
}

.slice-num {
  font-size: 2.35rem;
  font-weight: 700;
  color: var(--blue);
  line-height: 1;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}

@media (min-width: 768px) {
  .slice-num {
    font-size: 3.75rem;
  }
}

.slice-label {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--warm);
  letter-spacing: 0.04em;
}

.slice-title {
  font-size: 1.65rem;
  line-height: 1.32;
  color: var(--text);
  margin-bottom: 16px;
}

@media (min-width: 768px) {
  .slice-title {
    font-size: 2.25rem;
  }
}

.slice-direct-answer {
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--text);
  background-color: rgba(255, 255, 255, 0.65);
  border-left: 3px solid var(--blue);
  padding: 12px 18px;
  max-width: 820px;
}

.slice-bg-white .slice-direct-answer {
  background-color: var(--bg);
}

/* 章节底部接片导航条 (Rule 45, 60) */
.slice-footer-bar {
  margin-top: 36px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 0.9375rem;
}

.next-slice-hint {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 600;
}

.next-slice-hint span {
  color: var(--muted);
  font-weight: 400;
}

.slice-action-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px;
}

.text-arrow-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-weight: 600;
  color: var(--blue);
}

.text-arrow-link .arrow {
  display: inline-block;
  transition: transform 0.18s ease;
}

.text-arrow-link:hover .arrow {
  transform: translateX(3px);
}

/* ==========================================================================
   01 / 开始 Hero 章节片 (Rule 30-43, 226)
   ========================================================================== */
.hero-slice {
  position: relative;
  background-color: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 44px 0 68px;
  display: flex;
  align-items: center;
}

@media (min-width: 1024px) {
  .hero-slice {
    min-height: 610px;
    max-height: 670px;
    padding: 56px 0 82px;
  }
}

.hero-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  width: 100%;
}

@media (min-width: 960px) {
  .hero-layout {
    grid-template-columns: 1fr 220px;
    align-items: start;
  }
}

.hero-top-bar {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}

.hero-chapter-no {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--blue);
  line-height: 1;
  letter-spacing: -0.03em;
}

@media (min-width: 768px) {
  .hero-chapter-no {
    font-size: 3.5rem;
  }
}

.hero-brand-badge {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
  background-color: var(--surface-alt);
  border: 1px solid var(--border);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
}

.hero-lead-slogan {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--warm);
  line-height: 1.45;
  margin-bottom: 12px;
}

@media (min-width: 768px) {
  .hero-lead-slogan {
    font-size: 1.5rem;
  }
}

.hero-h1 {
  font-size: 2.15rem;
  line-height: 1.22;
  color: var(--text);
  font-weight: 700;
  margin-bottom: 20px;
  max-width: 780px;
}

@media (min-width: 768px) {
  .hero-h1 {
    font-size: 3.15rem;
  }
}

@media (min-width: 1200px) {
  .hero-h1 {
    font-size: 3.4rem;
  }
}

.hero-desc {
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--text-body);
  max-width: 680px;
  margin-bottom: 30px;
}

/* Hero CTA 层级 (Rule 36-37) */
.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 22px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background-color: var(--blue);
  color: #FFFFFF;
  font-size: 1rem;
  font-weight: 600;
  padding: 12px 26px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--blue);
  transition: background-color 0.18s ease, transform 0.18s ease;
}

.btn-primary:hover {
  background-color: var(--blue-dark);
  border-color: var(--blue-dark);
  color: #FFFFFF;
  transform: translateY(-1px);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background-color: var(--surface);
  color: var(--text);
  font-size: 0.96875rem;
  font-weight: 600;
  padding: 11px 22px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--blue);
  color: var(--blue);
}

.hero-text-links {
  display: inline-flex;
  align-items: center;
  gap: 18px;
  padding-left: 4px;
}

.hero-text-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-body);
  border-bottom: 1px solid var(--border);
  padding-bottom: 2px;
}

.hero-text-link:hover {
  color: var(--blue);
  border-bottom-color: var(--blue);
}

/* 右侧轻量章节索引编号（非图片，仅章节编号留白，Rule 42） */
.hero-side-index {
  display: none;
}

@media (min-width: 960px) {
  .hero-side-index {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    justify-content: space-between;
    border-left: 1px solid var(--border);
    padding-left: 24px;
    color: var(--muted);
    font-size: 0.8125rem;
    line-height: 2;
  }
}

.hero-side-index .index-num {
  font-size: 4.2rem;
  font-weight: 700;
  color: var(--border);
  line-height: 1;
  margin-bottom: 12px;
}

/* Hero 底部接片预告：02 / 套餐 向上嵌入 14px-18px (Rule 39-40, 226) */
.hero-next-dock {
  position: absolute;
  bottom: -1px;
  right: 20px;
  background-color: var(--surface);
  border-top: 1px solid var(--border);
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
  padding: 8px 18px 6px;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  z-index: 4;
  text-decoration: none;
  color: var(--text);
  transition: transform 0.18s ease;
}

@media (min-width: 768px) {
  .hero-next-dock {
    right: 8%;
    padding: 10px 24px 8px;
  }
}

.hero-next-dock:hover {
  color: var(--blue);
  transform: translateY(-2px);
}

.hero-next-dock .dock-num {
  font-weight: 700;
  color: var(--blue);
  font-size: 0.9375rem;
}

.hero-next-dock .dock-label {
  font-size: 0.875rem;
  color: var(--text-body);
}

/* ==========================================================================
   02 / 套餐 宽幅内容片 (Rule 50-60, 227)
   ========================================================================== */
.demand-slices-stack {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border);
}

.demand-strip {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  padding: 22px 20px;
  border-bottom: 1px solid var(--border);
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
  background-color: var(--bg);
}

@media (min-width: 768px) {
  .demand-strip {
    grid-template-columns: 70px 210px 1fr auto;
    align-items: center;
    gap: 24px;
    padding: 24px 28px;
  }
}

/* 轻度：较短紧凑；日常：标准；主力：占据最明显区域；高频：横向展开长行 (Rule 59) */
.demand-strip--light {
  max-width: 920px;
  background-color: var(--surface);
}

.demand-strip--daily {
  max-width: 1020px;
  background-color: var(--bg);
}

.demand-strip--main {
  max-width: 100%;
  background-color: var(--surface-green);
  border-left: 3px solid var(--green);
  padding-top: 30px;
  padding-bottom: 30px;
}

.demand-strip--heavy {
  max-width: 100%;
  background-color: var(--surface-warm);
}

.demand-no {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--blue);
  font-variant-numeric: tabular-nums;
}

.demand-level {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text);
}

.demand-level-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: #FFFFFF;
  background-color: var(--accent);
  padding: 2px 8px;
  margin-left: 8px;
  border-radius: var(--radius-sm);
  vertical-align: middle;
}

.demand-scenes {
  font-size: 0.96875rem;
  color: var(--text-body);
}

/* ==========================================================================
   03 / 节点 四个水平章节行 (Rule 61-70, 228)
   ========================================================================== */
.node-rows-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border);
}

.node-row-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  padding: 26px 22px;
  background-color: var(--surface);
  border-bottom: 1px solid var(--border);
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
}

.node-row-item:nth-child(even) {
  background-color: var(--surface-warm);
}

@media (min-width: 860px) {
  .node-row-item {
    grid-template-columns: 150px 1.3fr 1fr auto;
    align-items: center;
    gap: 28px;
    padding: 30px 32px;
  }
}

.node-region-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.2;
}

.node-conclusion {
  font-size: 0.96875rem;
  color: var(--text);
  line-height: 1.7;
}

.node-scenarios {
  font-size: 0.875rem;
  color: var(--text-body);
  line-height: 1.65;
}

.node-scenarios strong {
  color: var(--text);
}

/* ==========================================================================
   04 / 线路 4个大标题段 + 细线表格 + 问答 (Rule 71-82, 229, 267-268)
   ========================================================================== */
.line-blocks-stack {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-bottom: 40px;
}

.line-topic-block {
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

@media (min-width: 768px) {
  .line-topic-block {
    grid-template-columns: 220px 1fr;
    gap: 32px;
  }
}

.line-topic-heading {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text);
}

.line-topic-heading span {
  display: block;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--warm);
  margin-top: 4px;
}

.line-topic-body p {
  margin-bottom: 8px;
  font-size: 0.96875rem;
}

/* 横向细线表格 & 移动端块状响应式 (Rule 79-80, 268) */
.table-caption {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 12px;
}

.editorial-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 36px;
  border-top: 2px solid var(--text);
  border-bottom: 1px solid var(--border);
}

.editorial-table th,
.editorial-table td {
  text-align: left;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  font-size: 0.9375rem;
  line-height: 1.65;
  vertical-align: top;
}

.editorial-table th {
  color: var(--text);
  font-weight: 600;
  background-color: var(--bg);
}

@media (max-width: 767px) {
  .editorial-table,
  .editorial-table thead,
  .editorial-table tbody,
  .editorial-table tr,
  .editorial-table th,
  .editorial-table td {
    display: block;
    width: 100%;
  }

  .editorial-table thead {
    display: none;
  }

  .editorial-table tr {
    padding: 16px 0;
    border-bottom: 1px solid var(--border);
  }

  .editorial-table td {
    padding: 6px 0;
    border-bottom: none;
  }

  .editorial-table td::before {
    content: attr(data-label) "：";
    font-weight: 600;
    color: var(--text);
  }
}

/* 线路 FAQ 式问题列表 (Rule 81) */
.line-qa-list {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.line-qa-item {
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.line-qa-q {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}

.line-qa-a {
  font-size: 0.9375rem;
  color: var(--text-body);
}

/* ==========================================================================
   05 / AI与流媒体 连续文字片段与平台行 (Rule 83-93, 230-231)
   ========================================================================== */
.sub-chapter-box {
  padding: 28px 0;
}

.sub-chapter-box + .sub-chapter-box {
  border-top: 1px solid var(--border);
  margin-top: 16px;
  padding-top: 36px;
}

.sub-chapter-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 10px;
}

.sub-chapter-note {
  font-size: 0.96875rem;
  color: var(--text-body);
  margin-bottom: 24px;
  max-width: 820px;
}

.ai-segments-flow {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border);
}

.ai-segment-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
}

@media (min-width: 768px) {
  .ai-segment-row {
    grid-template-columns: 200px 1fr;
    align-items: baseline;
    gap: 24px;
  }
}

.ai-segment-row--primary .ai-platform-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
}

.ai-segment-row--secondary .ai-platform-name {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--blue);
}

.ai-platform-desc {
  font-size: 0.95rem;
  color: var(--text-body);
}

/* 流媒体行 (Rule 90-92) */
.streaming-rows-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border);
}

.streaming-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
}

@media (min-width: 768px) {
  .streaming-row {
    grid-template-columns: 180px 1fr auto;
    align-items: center;
    gap: 24px;
  }
}

.streaming-name {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text);
}

.streaming-desc {
  font-size: 0.95rem;
  color: var(--text-body);
}

/* ==========================================================================
   06 / 客户端 连续设备章节 (Rule 94-103, 232)
   ========================================================================== */
.device-chapters-flow {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border);
}

.device-chapter-item {
  padding: 26px 0;
  border-bottom: 1px solid var(--border);
}

.device-chapter-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.device-name {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text);
}

.device-steps-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.device-step-tag {
  font-size: 0.8125rem;
  color: var(--text);
  background-color: var(--bg);
  border: 1px solid var(--border);
  padding: 3px 10px;
  border-radius: var(--radius-sm);
}

.device-ops-strip {
  margin-top: 28px;
  padding: 20px 24px;
  background-color: var(--surface-blue);
  border-left: 3px solid var(--blue);
}

.device-ops-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

/* ==========================================================================
   07 / 完整价格 “五片套餐”横向连续章节片 (Rule 104-120, 233)
   ========================================================================== */
.five-plans-stack {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border);
}

.plan-slice-row {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  padding: 24px 20px;
  background-color: var(--surface);
  border-bottom: 1px solid var(--border);
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
  min-height: 136px;
}

.plan-slice-row:nth-child(even) {
  background-color: var(--bg);
}

@media (min-width: 860px) {
  .plan-slice-row {
    grid-template-columns: 64px 170px 140px 150px 1fr auto;
    align-items: center;
    gap: 20px;
    padding: 28px 32px;
    min-height: 145px;
  }
}

/* 五片套餐之间轻微几何接合 (Rule 115) */
.plan-slice-row:not(:last-child)::after {
  content: "";
  position: absolute;
  bottom: -6px;
  left: 18%;
  width: 56px;
  height: 6px;
  background-color: inherit;
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  z-index: 2;
}

.plan-slice-row:nth-child(2)::after {
  left: 42%;
}

.plan-slice-row:nth-child(3)::after {
  left: 64%;
}

.plan-slice-row:nth-child(4)::after {
  left: 28%;
}

/* 主力方案唯一突出视觉 (Rule 110, 113, 116) */
.plan-slice-row--featured {
  background-color: var(--surface-green) !important;
  border-left: 3px solid var(--green);
  min-height: 186px;
  padding-top: 34px;
  padding-bottom: 34px;
}

/* 移动端五片套餐顺序 (Rule 120):
   主力方案(03) -> 日常方案(02) -> 轻量方案(01) -> 高频方案(04) -> 长期方案(05) */
@media (max-width: 859px) {
  .plan-order-main { order: 1; }
  .plan-order-daily { order: 2; }
  .plan-order-light { order: 3; }
  .plan-order-heavy { order: 4; }
  .plan-order-long  { order: 5; }
}

.plan-num {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.plan-slice-row--featured .plan-num {
  color: var(--green-dark);
}

.plan-name-wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.plan-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
}

.plan-badge-terracotta {
  display: inline-block;
  background-color: var(--accent);
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 9px;
  border-radius: var(--radius-sm);
}

.plan-traffic {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--blue);
}

.plan-price {
  font-size: 1.95rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.1;
}

.plan-slice-row--featured .plan-price {
  font-size: 2.35rem;
  color: var(--green-dark);
}

.plan-price small {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--muted);
}

.plan-usage {
  font-size: 0.9375rem;
  color: var(--text-body);
}

.pricing-disclaimer {
  margin-top: 20px;
  font-size: 0.875rem;
  color: var(--muted);
}

/* ==========================================================================
   08 / 深度评测 大文章片 (Rule 121-125)
   ========================================================================== */
.review-feature-slice {
  background-color: var(--bg);
  border: 1px solid var(--border);
  border-left: 4px solid var(--blue);
  padding: 32px 24px;
}

@media (min-width: 768px) {
  .review-feature-slice {
    padding: 44px 48px;
  }
}

.review-dimension-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0 28px;
}

.review-dimension-pill {
  background-color: var(--surface);
  border: 1px solid var(--border);
  padding: 6px 14px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
}

/* ==========================================================================
   09 / 使用教程 “文章分镜” (Rule 130-138, 234)
   ========================================================================== */
.storyboard-articles {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

/* 最大：大文章片（全宽） */
.article-slice-large {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-left: 4px solid var(--warm);
  padding: 30px 24px;
}

@media (min-width: 768px) {
  .article-slice-large {
    padding: 38px 40px;
  }
}

/* 中型文章片（两个，上下连续） */
.article-slices-medium {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border);
}

.article-slice-medium {
  background-color: var(--surface);
  border-bottom: 1px solid var(--border);
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
  padding: 26px 24px;
}

@media (min-width: 768px) {
  .article-slice-medium {
    padding: 30px 36px;
  }
}

/* 普通文章片（紧凑横向行） */
.article-slices-compact {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border);
}

.article-row-compact {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  padding: 20px 22px;
  background-color: var(--surface);
  border-bottom: 1px solid var(--border);
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
}

.article-row-compact:nth-child(even) {
  background-color: var(--bg);
}

@media (min-width: 900px) {
  .article-row-compact {
    grid-template-columns: 110px 1.3fr 1.5fr 160px auto;
    align-items: center;
    gap: 20px;
    padding: 22px 28px;
  }
}

.article-cat-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--blue);
  background-color: var(--surface-blue);
  padding: 3px 9px;
  border-radius: var(--radius-sm);
  width: fit-content;
}

.article-slice-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text);
  margin: 10px 0;
}

.article-row-compact .article-slice-title {
  font-size: 1.0625rem;
  margin: 0;
}

.article-slice-title a {
  color: var(--text);
}

.article-slice-title a:hover {
  color: var(--blue);
}

.article-excerpt {
  font-size: 0.9375rem;
  color: var(--text-body);
  line-height: 1.7;
}

.article-meta-info {
  font-size: 0.8125rem;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* 分类入口导航条 */
.category-strip-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 28px;
  padding: 18px 22px;
  background-color: var(--surface);
  border: 1px solid var(--border);
}

.category-strip-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
}

.category-strip-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--blue);
  padding: 4px 12px;
  border: 1px solid var(--border);
  background-color: var(--bg);
}

.category-strip-link:hover {
  border-color: var(--blue);
  background-color: var(--surface-blue);
}

/* ==========================================================================
   10 / 网络排障 7个连续横向章节行 (Rule 144-156)
   ========================================================================== */
.trouble-rows-stack {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border);
}

.trouble-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 22px 20px;
  border-bottom: 1px solid var(--border);
  background-color: var(--surface);
}

.trouble-row:nth-child(even) {
  background-color: var(--bg);
}

@media (min-width: 768px) {
  .trouble-row {
    grid-template-columns: 70px 180px 1fr;
    align-items: baseline;
    gap: 24px;
    padding: 24px 28px;
  }
}

.trouble-no {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--warm);
  font-variant-numeric: tabular-nums;
}

.trouble-topic {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text);
}

.trouble-direction {
  font-size: 0.95rem;
  color: var(--text-body);
}

/* ==========================================================================
   11 / 常见问题 FAQ 连续问题行 (Rule 157-162, 251, 275)
   ========================================================================== */
.faq-rows-stack {
  border-top: 1px solid var(--border);
}

.faq-row-item {
  border-bottom: 1px solid var(--border);
  background-color: transparent;
  transition: background-color 0.15s ease;
}

.faq-row-item.is-open {
  background-color: var(--surface-warm);
}

.faq-question-btn {
  width: 100%;
  display: grid;
  grid-template-columns: 48px 1fr 28px;
  align-items: center;
  gap: 12px;
  padding: 20px 16px;
  background: none;
  border: none;
  text-align: left;
  font-family: inherit;
  cursor: pointer;
  color: var(--text);
}

@media (min-width: 768px) {
  .faq-question-btn {
    grid-template-columns: 64px 1fr 32px;
    padding: 22px 24px;
  }
}

.faq-q-code {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--blue);
  font-variant-numeric: tabular-nums;
}

.faq-q-text {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.45;
}

.faq-q-icon {
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--muted);
  text-align: right;
  line-height: 1;
}

.faq-row-item.is-open .faq-q-icon {
  color: var(--accent);
}

.faq-answer-panel {
  padding: 0 16px 22px 64px;
  font-size: 0.96875rem;
  color: var(--text-body);
  line-height: 1.8;
}

@media (max-width: 767px) {
  .faq-answer-panel {
    padding: 0 16px 20px 16px;
  }
}

@media (min-width: 768px) {
  .faq-answer-panel {
    padding: 0 48px 24px 88px;
  }
}

/* 当 JS 启用时，未展开项隐藏答案；当 JS 关闭时，全部可见 (Rule 194, 275) */
.js-enabled .faq-row-item:not(.is-open) .faq-answer-panel {
  display: none;
}

/* ==========================================================================
   文章页 & 分类页 “轻量分镜阅读” (Rule 141-143, 163-172, 190)
   ========================================================================== */
.breadcrumb-bar {
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
  background-color: var(--bg);
  font-size: 0.875rem;
  color: var(--muted);
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.breadcrumb-list a {
  color: var(--text-body);
}

.breadcrumb-list a:hover {
  color: var(--blue);
}

/* 分类页顶部封面片 (220px-320px, Rule 142-143) */
.category-cover-slice {
  background-color: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 40px 0 44px;
  min-height: 230px;
  display: flex;
  align-items: center;
  position: relative;
}

.category-cover-no {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--warm);
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.category-cover-h1 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 14px;
}

@media (min-width: 768px) {
  .category-cover-h1 {
    font-size: 2.5rem;
  }
}

.category-cover-intro {
  font-size: 1rem;
  color: var(--text-body);
  max-width: 780px;
  line-height: 1.8;
}

/* 文章页头部与正文双栏目录结构 (Rule 163-172) */
.article-header-slice {
  background-color: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 40px 0 44px;
}

.article-stage-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 18px;
}

.article-stage-pill {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--blue);
  background-color: var(--surface-blue);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
}

.article-page-h1 {
  font-size: 1.9rem;
  line-height: 1.3;
  color: var(--text);
  margin-bottom: 16px;
  max-width: 820px;
}

@media (min-width: 768px) {
  .article-page-h1 {
    font-size: 2.55rem;
  }
}

.article-page-lead {
  font-size: 1.0625rem;
  color: var(--text-body);
  max-width: 800px;
  margin-bottom: 20px;
}

.article-byline {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 24px;
  font-size: 0.85rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  padding-top: 14px;
}

.article-layout-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  padding: 44px 0 68px;
}

@media (min-width: 1024px) {
  .article-layout-wrap {
    grid-template-columns: minmax(0, var(--article-max)) 230px;
    justify-content: space-between;
    align-items: start;
  }
}

/* 快速结论片 (Rule 126, 166) */
.quick-conclusion-box {
  background-color: var(--surface-green);
  border: 1px solid var(--border);
  border-left: 4px solid var(--green);
  padding: 24px 26px;
  margin-bottom: 36px;
}

.quick-conclusion-label {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--green-dark);
  margin-bottom: 8px;
  letter-spacing: 0.03em;
}

.quick-conclusion-box p {
  font-size: 1.03rem;
  color: var(--text);
  line-height: 1.85;
  margin: 0;
}

/* 文章内部小分镜 H2 (Rule 167-169) */
.article-content {
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--text-body);
}

.article-section-block {
  padding-bottom: 32px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--border);
}

.article-h2-kicker {
  display: block;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--warm);
  font-variant-numeric: tabular-nums;
  margin-bottom: 4px;
}

.article-content h2 {
  font-size: 1.55rem;
  color: var(--text);
  margin-bottom: 14px;
  line-height: 1.35;
}

@media (min-width: 768px) {
  .article-content h2 {
    font-size: 1.75rem;
  }
}

.article-content h3 {
  font-size: 1.25rem;
  color: var(--text);
  margin: 22px 0 10px;
}

.article-content p {
  margin-bottom: 16px;
}

.article-content .direct-answer-para {
  font-weight: 600;
  color: var(--text);
}

.article-content ul,
.article-content ol {
  margin: 14px 0 18px 20px;
}

.article-content ul li {
  list-style: disc;
  margin-bottom: 8px;
}

.article-content ol li {
  list-style: decimal;
  margin-bottom: 8px;
}

/* 右侧轻量目录与移动端折叠目录 (Rule 170-171) */
.article-toc-aside {
  width: 100%;
}

@media (min-width: 1024px) {
  .article-toc-aside {
    position: sticky;
    top: 90px;
    max-width: 230px;
  }
}

.toc-box {
  background-color: var(--surface);
  border: 1px solid var(--border);
  padding: 18px 20px;
}

.toc-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 68vh;
  overflow-y: auto;
}

.toc-list a {
  font-size: 0.84rem;
  color: var(--text-body);
  line-height: 1.45;
  display: block;
}

.toc-list a:hover {
  color: var(--blue);
}

.mobile-toc-details {
  display: block;
  background-color: var(--surface);
  border: 1px solid var(--border);
  padding: 14px 18px;
  margin-bottom: 28px;
}

.mobile-toc-details summary {
  font-weight: 700;
  color: var(--text);
  cursor: pointer;
}

.mobile-toc-details ul {
  margin: 12px 0 0 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.mobile-toc-details ul li {
  list-style: none;
  margin: 0;
}

@media (min-width: 1024px) {
  .mobile-toc-details {
    display: none;
  }
}

@media (max-width: 1023px) {
  .article-toc-aside {
    display: none;
  }
}

/* 文章底部内链闭环：上一篇/下一篇/相关阅读/返回分类 (Rule 172, 188) */
.article-bottom-nav {
  margin-top: 36px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 768px) {
  .article-bottom-nav {
    grid-template-columns: 1fr 1fr;
  }
}

.article-nav-card {
  background-color: var(--surface);
  border: 1px solid var(--border);
  padding: 16px 20px;
}

.article-nav-label {
  font-size: 0.78rem;
  color: var(--muted);
  display: block;
  margin-bottom: 4px;
}

.related-reading-box {
  margin-top: 32px;
  background-color: var(--surface-alt);
  border: 1px solid var(--border);
  padding: 24px 26px;
}

.related-reading-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 14px;
}

.related-reading-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.related-reading-list li {
  list-style: none !important;
  margin: 0 !important;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

/* ==========================================================================
   Footer 最后收尾片 (Rule 202-209, 235, 272-273)
   ========================================================================== */
.site-footer {
  position: relative;
  background-color: var(--surface-alt); /* #F1F0EB */
  color: var(--footer-text); /* #4C5558 */
  border-top: 1px solid var(--border); /* #E1DED8 */
  padding: 40px 0 28px;
  font-size: 0.875rem;
  line-height: 1.7;
}

/* Footer 顶部保留一个很轻的小切口 (Rule 205) */
.site-footer::before {
  content: "";
  position: absolute;
  top: -8px;
  left: 14%;
  width: 84px;
  height: 8px;
  background-color: var(--surface-alt);
  border-top: 1px solid var(--border);
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border);
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1.4fr 1fr 1fr 1fr 1fr;
    gap: 24px;
  }
}

.footer-brand-title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 6px;
}

.footer-brand-desc {
  color: var(--footer-text);
  margin-bottom: 14px;
  font-size: 0.85rem;
}

.footer-cta-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background-color: var(--blue);
  color: #FFFFFF;
  padding: 7px 15px;
  font-size: 0.84rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
}

.footer-cta-link:hover {
  background-color: var(--blue-dark);
  color: #FFFFFF;
}

.footer-col-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 10px;
}

.footer-links-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.footer-links-list a {
  color: var(--footer-text);
  font-size: 0.85rem;
}

.footer-links-list a:hover {
  color: var(--text);
}

.footer-bottom-bar {
  padding-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  justify-content: space-between;
  font-size: 0.8125rem;
  color: var(--footer-text);
}

@media (min-width: 768px) {
  .footer-bottom-bar {
    flex-direction: row;
    align-items: center;
  }
}

.friend-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.friend-links a {
  color: var(--footer-text);
  border-bottom: 1px solid transparent;
}

.friend-links a:hover {
  color: var(--text);
  border-bottom-color: var(--footer-text);
}

/* ==========================================================================
   prefers-reduced-motion 完整支持 (Rule 221 & 276)
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .btn-primary:hover,
  .hero-next-dock:hover,
  .text-arrow-link:hover .arrow {
    transform: none !important;
  }
}