/* =========================================================
   糖心传媒 · 全站样式表
   视觉方向：法律专业风 × 媒体目录感
   色彩：暖白底 / 深灰正文 / 档案深褐强调
   ========================================================= */

/* =========================================================
   01 · Base — 变量、重置、全局基础
   ========================================================= */

:root {
  --color-bg: #f5f3ef;
  --color-text: #1c1c1a;
  --color-accent: #7a4b2a;
  --color-accent-soft: #a47a55;
  --color-line: #b0a89c;
  --color-card: #ffffff;
  --color-muted: #6b655c;
  --color-code-bg: #f0ede8;
  --font-serif: "Noto Serif SC", "Songti SC", "SimSun", "STSong", serif;
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --container-width: 1200px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --shadow-card: 0 1px 3px rgba(28, 28, 26, 0.08);
  --shadow-card-hover: 0 4px 12px rgba(28, 28, 26, 0.1);
  --transition-base: 0.2s ease;
  --header-height: 64px;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-base);
}

a:hover {
  color: var(--color-accent-soft);
}

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
}

/* 视觉隐藏，仅供屏幕阅读器 */
.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

/* =========================================================
   02 · Layout — 容器、版心、骨架
   ========================================================= */

.site-header {
  background-color: var(--color-card);
  border-bottom: 1px solid var(--color-line);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.02em;
  flex-shrink: 0;
}

.brand-link:hover {
  color: var(--color-accent);
}

.brand-name {
  display: inline-block;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  background: none;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--color-text);
  cursor: pointer;
  transition: border-color var(--transition-base), color var(--transition-base);
}

.nav-toggle:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.nav-toggle-icon {
  display: inline-block;
  width: 14px;
  height: 2px;
  background-color: currentColor;
  position: relative;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 14px;
  height: 2px;
  background-color: currentColor;
}

.nav-toggle-icon::before {
  top: -5px;
}

.nav-toggle-icon::after {
  top: 5px;
}

.site-nav {
  display: block;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-list li a {
  display: block;
  padding: 8px 14px;
  font-size: 14px;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-base), color var(--transition-base);
}

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

.nav-list li a.is-current {
  background-color: var(--color-accent);
  color: #fff;
}

.site-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.site-main.inner-main {
  padding-top: 24px;
  padding-bottom: 64px;
}

.site-main.home-main {
  padding-top: 0;
  padding-bottom: 0;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--color-muted);
}

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

.breadcrumb-sep {
  color: var(--color-line);
}

.breadcrumb-current {
  color: var(--color-text);
}

/* 页头标题区 */
.page-header {
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-line);
}

.page-title {
  font-size: 34px;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 10px;
}

.page-description {
  font-size: 16px;
  color: var(--color-muted);
  max-width: 780px;
  line-height: 1.7;
}

/* 页脚 */
.site-footer {
  background-color: #1c1c1a;
  color: #d8d2c8;
  margin-top: 64px;
}

.footer-columns {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 32px;
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr 1fr;
  gap: 40px;
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.7;
  color: #b8b2a8;
  margin-top: 8px;
}

.footer-brand-name {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: #fff;
  margin-top: 0;
}

.footer-col h3 {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 14px;
  letter-spacing: 0.04em;
}

.footer-col ul li {
  margin-bottom: 8px;
}

.footer-col ul li a {
  font-size: 14px;
  color: #b8b2a8;
}

.footer-col ul li a:hover {
  color: #fff;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 16px 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: #8f8a82;
  max-width: var(--container-width);
  margin: 0 auto;
}

/* =========================================================
   03 · Components — 通用组件
   ========================================================= */

/* 按钮 */
.btn-browse {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 500;
  background-color: var(--color-card);
  color: var(--color-text);
  border: 1px solid var(--color-line);
  cursor: pointer;
  transition: border-color var(--transition-base), background-color var(--transition-base), color var(--transition-base);
}

.btn-browse:hover {
  border-color: var(--color-accent);
  background-color: var(--color-accent);
  color: #fff;
}

.btn-browse.is-primary {
  background-color: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

.btn-browse.is-primary:hover {
  background-color: var(--color-accent-soft);
  border-color: var(--color-accent-soft);
}

.btn-home {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  font-size: 16px;
  font-weight: 500;
  background-color: var(--color-accent);
  color: #fff;
  border: 1px solid var(--color-accent);
  cursor: pointer;
  transition: background-color var(--transition-base);
}

.btn-home:hover {
  background-color: var(--color-accent-soft);
  color: #fff;
}

/* 文本链接 */
.text-link {
  display: inline-block;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-accent);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-base);
}

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

/* 表格 */
.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  line-height: 1.6;
}

.data-table th,
.data-table td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--color-line);
  vertical-align: top;
}

.data-table th {
  background-color: var(--color-bg);
  font-family: var(--font-sans);
  font-weight: 600;
  color: var(--color-text);
  white-space: nowrap;
  cursor: pointer;
  user-select: none;
  position: relative;
}

.data-table th:hover {
  color: var(--color-accent);
}

.data-table th.sortable-table__sort-desc::after {
  content: " ↓";
  font-size: 12px;
}

.data-table th.sortable-table__sort-asc::after {
  content: " ↑";
  font-size: 12px;
}

.data-table tbody tr:last-child td {
  border-bottom: none;
}

.data-table tbody tr:hover {
  background-color: rgba(245, 243, 239, 0.6);
}

/* 比较表（误区对照） */
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  line-height: 1.6;
}

.comparison-table th,
.comparison-table td {
  padding: 12px 14px;
  text-align: left;
  border: 1px solid var(--color-line);
  vertical-align: top;
}

.comparison-table th {
  background-color: var(--color-bg);
  font-family: var(--font-sans);
  font-weight: 600;
}

/* 图片容器 */
figure {
  margin: 0;
}

figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

figcaption {
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.6;
  margin-top: 8px;
}

/* FAQ */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-item summary {
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 40px;
  transition: color var(--transition-base);
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  font-weight: 400;
  color: var(--color-accent);
  transition: transform var(--transition-base);
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-item summary:hover {
  color: var(--color-accent);
}

.faq-content {
  padding: 0 20px 16px;
  border-top: 1px solid var(--color-line);
}

.faq-content p {
  margin-top: 12px;
  font-size: 14px;
  line-height: 1.7;
}

.faq-content strong {
  color: var(--color-accent);
}

/* 侧栏 */
.aside-links li {
  margin-bottom: 10px;
}

.aside-links li a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--color-text);
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-base), color var(--transition-base);
}

.aside-links li a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.aside-title {
  font-size: 18px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

/* 相关链接条 */
.related-links {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  padding: 16px 0;
  margin-top: 40px;
  border-top: 1px solid var(--color-line);
}

.related-links-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-muted);
}

.related-links-item {
  font-size: 14px;
  color: var(--color-accent);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-base);
}

.related-links-item:hover {
  border-bottom-color: var(--color-accent);
}

/* 章节标题 */
.section-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

.section-note {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 16px;
}

.section-intro {
  font-size: 15px;
  line-height: 1.7;
  margin-bottom: 20px;
}

/* 步骤编号 */
.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: var(--color-accent);
  color: #fff;
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
  flex-shrink: 0;
}

/* =========================================================
   04 · Pages — 首页
   ========================================================= */

/* ---- Hero 作品档案首屏 ---- */
.hero-archive {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
  padding: 72px 0 64px;
}

.hero-content {
  max-width: 560px;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  text-transform: uppercase;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-accent);
}

.hero-archive h1 {
  font-size: 40px;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 16px;
}

.hero-tagline {
  font-size: 17px;
  line-height: 1.7;
  color: var(--color-muted);
  margin-bottom: 28px;
}

.hero-browse-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-figure {
  width: 100%;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.hero-figure img {
  width: 100%;
  height: 380px;
  object-fit: cover;
  display: block;
}

/* ---- 频道栏与内容流双栏 ---- */
.channels-stream-section {
  padding: 48px 0;
  border-top: 1px solid var(--color-line);
}

.layout-shell {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 40px;
  align-items: start;
}

.sidebar-left .channel-sidebar {
  grid-column: 1;
  grid-row: 1;
}

.sidebar-left .stream-main {
  grid-column: 2;
  grid-row: 1;
}

.channel-sidebar {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px;
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.channel-sidebar h2 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

.channel-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.channel-list li a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  font-size: 14px;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-base), color var(--transition-base);
}

.channel-list li a::after {
  content: "→";
  color: var(--color-line);
  font-size: 13px;
  transition: color var(--transition-base);
}

.channel-list li a:hover {
  background-color: var(--color-bg);
  color: var(--color-accent);
}

.channel-list li a:hover::after {
  color: var(--color-accent);
}

.link-archive {
  display: inline-block;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--color-line);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  width: 100%;
  text-align: center;
}

.link-archive:hover {
  color: var(--color-accent-soft);
}

.stream-main h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 24px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

.stream-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.stream-item {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 20px;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  padding: 0;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.stream-item:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.stream-item img {
  width: 160px;
  height: 110px;
  object-fit: cover;
}

.stream-item-body {
  padding: 16px 16px 16px 0;
}

.stream-item-body h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}

.stream-item-body h3 a {
  color: var(--color-text);
}

.stream-item-body h3 a:hover {
  color: var(--color-accent);
}

.stream-item-body p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ---- 专题片单推荐 ---- */
.featured-collections {
  padding: 48px 0;
  border-top: 1px solid var(--color-line);
}

.featured-collections h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 24px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

.collection-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.collection-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.collection-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.collection-card img {
  width: 100%;
  height: 160px;
  object-fit: cover;
}

.collection-card-body {
  padding: 20px;
}

.collection-card-body h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
}

.collection-card-body p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: 14px;
}

.collection-card-body a {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-base);
}

.collection-card-body a:hover {
  border-bottom-color: var(--color-accent);
}

/* ---- 观看指南摘要 ---- */
.guide-summary {
  padding: 48px 0;
  border-top: 1px solid var(--color-line);
}

.guide-summary h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 24px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

.guide-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 24px;
}

.guide-step {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: box-shadow var(--transition-base);
}

.guide-step:hover {
  box-shadow: var(--shadow-card-hover);
}

.guide-step .step-number {
  margin-bottom: 14px;
}

.guide-step h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
}

.guide-step p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
}

.link-guide {
  display: inline-block;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-accent);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-base);
}

.link-guide:hover {
  border-bottom-color: var(--color-accent);
}

/* ---- 误区与边界引导 ---- */
.clarify-boundary-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  padding: 48px 0;
  border-top: 1px solid var(--color-line);
}

.clarify-card,
.boundary-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.clarify-card:hover,
.boundary-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.clarify-card h2,
.boundary-card h2 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
}

.clarify-card p,
.boundary-card p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: 16px;
}

.clarify-card a,
.boundary-card a {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-base);
}

.clarify-card a:hover,
.boundary-card a:hover {
  border-bottom-color: var(--color-accent);
}

/* =========================================================
   05 · Pages — 档案索引 archive
   ========================================================= */

.archive-summary {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 28px;
  margin-bottom: 40px;
}

.summary-text {
  font-size: 15px;
  line-height: 1.7;
  margin-bottom: 20px;
}

.dimension-tags {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.dimension-tags li {
  padding: 8px 18px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
}

.archive-section {
  margin-bottom: 48px;
}

.archive-section h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

.year-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.year-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  display: flex;
  align-items: baseline;
  gap: 16px;
}

.year-item h3 {
  font-size: 16px;
  font-weight: 700;
  min-width: 80px;
  color: var(--color-accent);
}

.year-item p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
}

.archive-aside {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-top: 48px;
}

.archive-aside h2 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

.archive-figure {
  margin-top: 24px;
}

.archive-figure img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.aside-figure img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  margin-top: 16px;
}

.aside-figure figcaption {
  font-size: 13px;
  color: var(--color-muted);
  margin-top: 6px;
}

.featured-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.featured-item {
  padding: 12px 16px;
  background-color: var(--color-bg);
  border-radius: var(--radius-sm);
}

.featured-item a {
  font-size: 14px;
  font-weight: 500;
}

/* =========================================================
   06 · Pages — 专题片单 zhuanti
   ========================================================= */

.topic-cards {
  margin-bottom: 48px;
}

.topic-cards h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 24px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

.topic-card {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 0;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 20px;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.topic-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.topic-card-media img {
  width: 280px;
  height: 100%;
  min-height: 200px;
  object-fit: cover;
}

.topic-card-body {
  padding: 24px 28px;
}

.topic-card-body h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
}

.topic-card-body > p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 16px;
}

.topic-meta {
  display: flex;
  gap: 32px;
  margin-bottom: 16px;
}

.topic-meta div {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.topic-meta dt {
  font-size: 13px;
  color: var(--color-muted);
}

.topic-meta dd {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

.topic-card-body a {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-base);
}

.topic-card-body a:hover {
  border-bottom-color: var(--color-accent);
}

.topic-channel-index {
  margin-bottom: 48px;
}

.topic-channel-index h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

.topic-channel-index > p {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 16px;
}

.related-topics {
  margin-bottom: 48px;
}

.related-topics h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

.related-topics > p {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 20px;
}

.related-topic-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.related-topic-card {
  display: block;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  color: var(--color-text);
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.related-topic-card:hover {
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-accent);
  color: var(--color-text);
}

.related-topic-card h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--color-accent);
}

.related-topic-card p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
}

.related-info {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px 28px;
}

.related-info h2 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}

.related-info p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
}

.related-info p a {
  margin-right: 16px;
  font-weight: 500;
}

/* =========================================================
   07 · Pages — 观看指南 zhinan
   ========================================================= */

.executive-summary {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 28px;
  margin-bottom: 40px;
}

.summary-intro {
  font-size: 15px;
  line-height: 1.7;
  margin-bottom: 24px;
}

.summary-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.step-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.step-item .step-number {
  flex-shrink: 0;
}

.step-item h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}

.step-item p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
}

.page-toc {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin-bottom: 40px;
}

.toc-list {
  counter-reset: toc;
}

.toc-list li {
  counter-increment: toc;
  margin-bottom: 8px;
}

.toc-list li::before {
  content: counter(toc) ".";
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--color-accent);
  margin-right: 8px;
}

.toc-list a {
  font-size: 15px;
  color: var(--color-text);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-base);
}

.toc-list a:hover {
  border-bottom-color: var(--color-accent);
  color: var(--color-accent);
}

.guide-chapters {
  margin-bottom: 48px;
}

.guide-step {
  margin-bottom: 40px;
}

.guide-step h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

.guide-step p {
  font-size: 15px;
  line-height: 1.7;
  margin-bottom: 16px;
  max-width: 780px;
}

.guide-media {
  margin: 20px 0;
}

.guide-media img {
  width: 100%;
  max-height: 320px;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.guide-step .text-link {
  margin-top: 8px;
}

.operation-table-section {
  margin-bottom: 48px;
}

.operation-table-section h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

.operation-table-section > p {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 16px;
}

.sources-section {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 28px;
  margin-bottom: 40px;
}

.sources-section p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 16px;
}

.sources-section .related-links {
  display: flex;
  gap: 20px;
  padding: 0;
  border: none;
  margin: 0;
}

.guide-aside {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px;
}

/* =========================================================
   08 · Pages — 常见误区 wujie
   ========================================================= */

.misconceptions-section {
  margin-bottom: 48px;
}

.misconceptions-section h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

.content-media-inline {
  margin: 20px 0;
  width: 100%;
}

.content-media-inline img {
  width: 100%;
  max-height: 260px;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.content-media-inline figcaption {
  font-size: 13px;
  color: var(--color-muted);
  margin-top: 8px;
}

.misconceptions-section .section-intro {
  margin-bottom: 24px;
}

.misconception-table-section {
  margin-bottom: 48px;
}

.misconception-table-section h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

.further-help {
  margin-bottom: 40px;
}

.further-help h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

.help-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 20px;
}

.help-link-card {
  display: block;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.help-link-card:hover {
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-accent);
}

.help-link-title {
  display: block;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 6px;
}

.help-link-desc {
  display: block;
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
}

/* =========================================================
   09 · Pages — 更新公告 gengxin
   ========================================================= */

.announcement-section {
  margin-bottom: 48px;
}

.announcement-section h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

.announcement-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.announcement-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  transition: box-shadow var(--transition-base);
}

.announcement-item:hover {
  box-shadow: var(--shadow-card-hover);
}

.announcement-summary {
  flex: 1;
}

.announcement-summary h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 6px;
}

.announcement-batch {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-accent);
  background-color: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: 999px;
  padding: 2px 12px;
  margin-bottom: 8px;
}

.announcement-abstract {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
}

.announcement-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  white-space: nowrap;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-base);
}

.announcement-link:hover {
  border-bottom-color: var(--color-accent);
}

.announcement-detail-section {
  margin-bottom: 48px;
}

.announcement-detail-section h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

.announcement-detail {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 28px;
  margin-bottom: 20px;
}

.announcement-detail h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}

.announcement-detail p {
  font-size: 14px;
  line-height: 1.7;
  margin-top: 12px;
  color: var(--color-text);
}

.announcement-figure {
  margin: 20px 0;
}

.announcement-figure img {
  width: 100%;
  max-height: 280px;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.announcement-figure figcaption {
  font-size: 13px;
  color: var(--color-muted);
  margin-top: 8px;
}

.related-announcements h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

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

.related-list li a {
  display: block;
  padding: 12px 16px;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--color-text);
  transition: border-color var(--transition-base), color var(--transition-base);
}

.related-list li a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* =========================================================
   10 · Pages — 内容边界 bianjie
   ========================================================= */

.boundary-summary {
  margin-bottom: 48px;
}

.boundary-summary h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

.boundary-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 24px;
}

.boundary-col {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px 28px;
}

.boundary-col h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

.boundary-provide h3 {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.boundary-not-provide h3 {
  color: var(--color-muted);
  border-bottom-color: var(--color-line);
}

.boundary-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.7;
  margin-bottom: 10px;
}

.boundary-list li::before {
  content: "·";
  position: absolute;
  left: 4px;
  font-weight: 700;
  color: var(--color-accent);
}

.boundary-not-provide .boundary-list li::before {
  content: "×";
  color: var(--color-muted);
}

.boundary-details {
  margin-bottom: 48px;
}

.boundary-details h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

.detail-list {
  counter-reset: detail;
}

.detail-item {
  counter-increment: detail;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  margin-bottom: 12px;
  position: relative;
  padding-left: 64px;
}

.detail-item::before {
  content: counter(detail, decimal-leading-zero);
  position: absolute;
  left: 20px;
  top: 20px;
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1.3;
}

.detail-item h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}

.detail-item p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
}

.boundary-links {
  margin-bottom: 40px;
}

.boundary-links h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

.link-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 20px;
}

.link-card {
  display: block;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.link-card:hover {
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-accent);
}

.link-card-title {
  display: block;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 6px;
}

.link-card-desc {
  display: block;
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
}

.feedback-note {
  margin-top: 24px;
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
}

.feedback-note a {
  margin-right: 16px;
  font-weight: 500;
}

/* =========================================================
   11 · Pages — 404
   ========================================================= */

.error-main {
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 64px 24px;
}

.error-section {
  text-align: center;
  max-width: 520px;
}

.error-code {
  font-family: var(--font-serif);
  font-size: 72px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1.2;
  margin-bottom: 8px;
}

.error-section h1 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 15px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 24px;
}

.error-help {
  margin-top: 24px;
  font-size: 14px;
  color: var(--color-muted);
}

.error-help a {
  margin: 0 10px;
  font-weight: 500;
}

/* =========================================================
   12 · Responsive — 响应式
   ========================================================= */

/* ---- 1024px 平板 ---- */
@media (max-width: 1024px) {
  .hero-archive {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 48px 0;
  }

  .hero-content {
    max-width: 100%;
  }

  .hero-figure img {
    height: 320px;
  }

  .layout-shell {
    grid-template-columns: 220px 1fr;
    gap: 24px;
  }

  .collection-cards {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .topic-card {
    grid-template-columns: 220px 1fr;
  }

  .topic-card-media img {
    width: 220px;
  }

  .footer-columns {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  /* 修复 1024px 表格溢出 */
  .table-wrap {
    overflow-x: auto;
  }

  .data-table {
    min-width: 0;
  }

  .data-table th,
  .data-table td {
    padding: 10px 12px;
    white-space: normal;
    word-break: break-word;
  }

  .comparison-table th,
  .comparison-table td {
    padding: 10px 12px;
    white-space: normal;
    word-break: break-word;
  }
}

/* ---- 768px 手机横屏 / 小平板 ---- */
@media (max-width: 768px) {
  .header-inner {
    padding: 0 16px;
  }

  .site-main {
    padding: 0 16px;
  }

  .site-main.inner-main {
    padding-top: 16px;
    padding-bottom: 48px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-card);
    border-bottom: 1px solid var(--color-line);
    box-shadow: var(--shadow-card);
    display: block;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    padding: 12px 16px;
    gap: 2px;
  }

  .nav-list.is-open {
    display: flex;
  }

  .nav-list li a {
    padding: 12px 14px;
    font-size: 15px;
  }

  .nav-list li a.is-current {
    background-color: var(--color-bg);
    color: var(--color-accent);
  }

  .hero-archive {
    padding: 32px 0;
  }

  .hero-archive h1 {
    font-size: 30px;
  }

  .hero-tagline {
    font-size: 15px;
  }

  .hero-figure img {
    height: 240px;
  }

  .layout-shell {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .sidebar-left .channel-sidebar,
  .sidebar-left .stream-main {
    grid-column: 1;
    grid-row: auto;
  }

  .channel-sidebar {
    position: static;
  }

  .stream-item {
    grid-template-columns: 120px 1fr;
    gap: 12px;
  }

  .stream-item img {
    width: 120px;
    height: 100px;
  }

  .stream-item-body {
    padding: 12px 12px 12px 0;
  }

  .collection-cards {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .collection-card img {
    height: 180px;
  }

  .guide-steps {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .clarify-boundary-section {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .topic-card {
    grid-template-columns: 1fr;
  }

  .topic-card-media img {
    width: 100%;
    height: 200px;
    min-height: 0;
  }

  .topic-meta {
    flex-direction: column;
    gap: 8px;
  }

  .related-topic-links {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .summary-steps {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .help-links {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .boundary-compare {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .link-cards {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .announcement-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .announcement-link {
    align-self: flex-start;
  }

  .footer-columns {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 40px 16px 24px;
  }

  .page-title {
    font-size: 28px;
  }

  .year-item {
    flex-direction: column;
    gap: 4px;
  }

  .year-item h3 {
    min-width: 0;
  }

  .detail-item {
    padding-left: 20px;
  }

  .detail-item::before {
    position: static;
    display: block;
    margin-bottom: 4px;
    font-size: 18px;
  }

  /* 图片容器避免溢出 */
  .content-media-inline img,
  .guide-media img,
  .archive-figure img,
  .aside-figure img,
  .announcement-figure img {
    height: auto;
    max-height: 220px;
  }
}

/* ---- 480px 手机竖屏 ---- */
@media (max-width: 480px) {
  .brand-link {
    font-size: 18px;
  }

  .nav-toggle-text {
    display: none;
  }

  .hero-archive h1 {
    font-size: 26px;
  }

  .hero-browse-actions {
    flex-direction: column;
  }

  .btn-browse {
    width: 100%;
  }

  .hero-figure img {
    height: 200px;
  }

  .stream-item {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .stream-item img {
    width: 100%;
    height: 160px;
  }

  .stream-item-body {
    padding: 14px;
  }

  .stream-item-body p {
    -webkit-line-clamp: 3;
  }

  .collection-card img {
    height: 160px;
  }

  .topic-card-body {
    padding: 20px;
  }

  .related-topic-card {
    padding: 16px 18px;
  }

  .page-title {
    font-size: 24px;
  }

  .page-description {
    font-size: 15px;
  }

  .data-table {
    font-size: 13px;
  }

  .data-table th,
  .data-table td {
    padding: 8px 10px;
  }

  .comparison-table {
    font-size: 13px;
  }

  .comparison-table th,
  .comparison-table td {
    padding: 8px 10px;
  }

  .faq-item summary {
    font-size: 14px;
    padding: 14px 16px;
    padding-right: 36px;
  }

  .faq-content {
    padding: 0 16px 14px;
  }

  .error-code {
    font-size: 56px;
  }

  .error-section h1 {
    font-size: 22px;
  }

  .footer-bottom {
    padding: 14px 16px;
  }
}

/* ---- 打印 ---- */
@media print {
  .site-header,
  .site-footer,
  .nav-toggle,
  .related-links,
  .breadcrumb {
    display: none;
  }

  body {
    background-color: #fff;
    color: #000;
  }

  .site-main {
    max-width: 100%;
    padding: 0;
  }

  a {
    color: #000;
    text-decoration: underline;
  }
}