/* ==========================================================================
   麻豆传媒官网版 - 整站样式表
   版本：1.0
   说明：覆盖全站首页、内页、404 页面的全部语义 class
   ========================================================================== */

/* ==========================================================================
   Base - 基础变量、重置、全局字体与颜色
   ========================================================================== */

:root {
  /* 色彩系统 */
  --color-bg: #0d1117;
  --color-panel: #161b22;
  --color-panel-light: #1c2128;
  --color-border: #2d333b;
  --color-text: #e6edf3;
  --color-text-secondary: #8b949e;
  --color-accent: #ff7a18;
  --color-accent-hover: #ff963f;
  --color-accent-soft: rgba(255, 122, 24, 0.12);
  --color-blue: #58a6ff;
  --color-success: #3fb950;

  /* 字体系统 */
  --font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  --font-size-base: 16px;
  --font-size-sm: 14px;
  --font-size-xs: 13px;
  --font-size-lg: 18px;
  --font-size-xl: 20px;
  --font-size-h1: 30px;
  --font-size-h2: 23px;
  --font-size-h3: 19px;
  --line-height-base: 1.75;
  --line-height-heading: 1.4;

  /* 布局系统 */
  --container-width: 1200px;
  --container-padding: 24px;
  --grid-gap: 24px;
  --section-gap: 64px;

  /* 圆角与阴影 */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.35);
  --shadow-hover: 0 6px 20px rgba(0, 0, 0, 0.5);

  /* 动效 */
  --transition-base: 0.25s ease;
  --transition-fast: 0.15s ease;

  /* 粘性页头高度 */
  --header-height: 64px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a {
  color: var(--color-blue);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

ul,
ol {
  list-style: none;
}

button {
  font-family: inherit;
  font-size: inherit;
  border: none;
  background: none;
  cursor: pointer;
  color: inherit;
}

details summary {
  cursor: pointer;
  list-style: none;
}

details summary::-webkit-details-marker {
  display: none;
}

/* 全局容器 */
.site-header .header-inner,
.site-main,
.site-footer .footer-top,
.site-footer .footer-bottom {
  max-width: var(--container-width);
  margin: 0 auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

/* 站点主体骨架 */
.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.site-main {
  flex: 1 0 auto;
  width: 100%;
}

/* ==========================================================================
   Layout - 页头、导航、页脚、面包屑、页面标题区
   ========================================================================== */

/* ---------- 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(13, 17, 23, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  gap: 24px;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}

.brand-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.02em;
  line-height: 1.2;
}

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

/* 主导航 */
.site-nav {
  display: flex;
  align-items: center;
}

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

.nav-list li {
  position: relative;
}

.nav-list a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 8px 16px;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-list a:hover {
  color: var(--color-text);
  background-color: rgba(255, 122, 24, 0.08);
}

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

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  gap: 5px;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.nav-toggle:hover {
  background-color: rgba(255, 255, 255, 0.06);
}

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 20px 0 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

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

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

.breadcrumb-sep {
  color: var(--color-text-secondary);
  opacity: 0.6;
}

.breadcrumb-current {
  color: var(--color-text);
  font-weight: 500;
}

/* ---------- 页面标题区（内页统一） ---------- */
.page-header {
  padding: 28px 0 20px;
}

.page-title {
  font-size: var(--font-size-h1);
  line-height: var(--line-height-heading);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 10px;
}

.page-description {
  font-size: var(--font-size-lg);
  line-height: var(--line-height-base);
  color: var(--color-text-secondary);
  max-width: 720px;
}

/* ---------- 页脚 ---------- */
.site-footer {
  background-color: var(--color-panel);
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 48px;
  padding-top: 48px;
  padding-bottom: 40px;
}

.footer-brand .footer-logo {
  display: inline-block;
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 12px;
}

.footer-desc {
  font-size: var(--font-size-sm);
  line-height: 1.7;
  color: var(--color-text-secondary);
  max-width: 320px;
}

.footer-nav h3,
.footer-meta h3 {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 16px;
}

.footer-nav ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-nav a {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

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

.footer-meta p {
  font-size: var(--font-size-sm);
  line-height: 1.7;
  color: var(--color-text-secondary);
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 20px;
  padding-bottom: 24px;
}

.footer-bottom p {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  text-align: center;
}

/* ==========================================================================
   Components - 通用组件
   ========================================================================== */

/* ---------- 区块标题 ---------- */
.section-title {
  font-size: var(--font-size-h2);
  font-weight: 700;
  line-height: var(--line-height-heading);
  color: var(--color-text);
  margin-bottom: 24px;
  position: relative;
  padding-left: 14px;
}

.section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  border-radius: 2px;
  background-color: var(--color-accent);
}

/* ---------- 卡片通用 ---------- */
.feature-card,
.sub-card,
.event-card,
.people-card,
.category-card,
.guide-card,
.download-card,
.link-card,
.research-card,
.recommend-card,
.related-card {
  background-color: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.feature-card:hover,
.sub-card:hover,
.event-card:hover,
.people-card:hover,
.category-card:hover,
.guide-card:hover,
.download-card:hover,
.link-card:hover,
.research-card:hover,
.recommend-card:hover,
.related-card:hover {
  transform: translateY(-3px);
  border-color: rgba(255, 122, 24, 0.5);
  box-shadow: var(--shadow-hover);
}

/* ---------- 图片容器与图片 ---------- */
.hero-visual,
.grid-featured img,
.sub-card img,
.event-card-media,
.people-card-media,
.research-media,
.material-figure,
.period-figure,
.flow-figure {
  position: relative;
  overflow: hidden;
}

.hero-visual img,
.grid-featured img,
.sub-card img,
.event-card-media img,
.people-card-media img,
.research-media img,
.material-figure img,
.period-figure img,
.flow-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 链接卡片 ---------- */
.link-card {
  display: block;
  padding: 24px;
}

.link-card h3 {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.link-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

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

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

.faq-item:hover {
  border-color: rgba(255, 122, 24, 0.4);
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--color-text);
  line-height: 1.5;
}

.faq-item summary::after {
  content: "+";
  flex-shrink: 0;
  font-size: 22px;
  font-weight: 400;
  color: var(--color-accent);
  transition: transform var(--transition-base);
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-answer,
.faq-item[open] p {
  padding: 0 20px 16px;
  font-size: var(--font-size-sm);
  line-height: 1.7;
  color: var(--color-text-secondary);
}

/* ==========================================================================
   Pages - 首页模块
   ========================================================================== */

/* ---------- 首屏焦点区 ---------- */
.hero-focus {
  padding: 48px 0 40px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 32px;
  align-items: stretch;
}

.hero-visual {
  border-radius: var(--radius-lg);
  min-height: 320px;
  max-height: 420px;
}

.hero-visual img {
  transition: transform 0.4s ease;
}

.hero-visual:hover img {
  transform: scale(1.02);
}

.hero-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  background-color: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
}

.hero-copy h1 {
  font-size: 28px;
  line-height: 1.35;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 12px;
}

.hero-lead {
  font-size: var(--font-size-base);
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

.hero-quick-entry {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.entry-link {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 10px 16px;
  background-color: var(--color-panel-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text);
  transition: border-color var(--transition-fast), background-color var(--transition-fast), color var(--transition-fast);
}

.entry-link:hover {
  border-color: var(--color-accent);
  background-color: var(--color-accent-soft);
  color: var(--color-accent);
}

/* ---------- 频道标签带 ---------- */
.channel-tags {
  padding: 40px 0;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.tag-chip {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 10px 20px;
  background-color: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: border-color var(--transition-fast), color var(--transition-fast), background-color var(--transition-fast);
}

.tag-chip:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background-color: var(--color-accent-soft);
}

/* ---------- 最新内容主次网格 ---------- */
.latest-grid {
  padding: 40px 0;
}

.grid-featured {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: var(--grid-gap);
  align-items: stretch;
}

.feature-card {
  display: flex;
  flex-direction: column;
}

.feature-card img {
  height: 260px;
}

.feature-info {
  padding: 24px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
  flex: 1;
}

.tag-label {
  display: inline-block;
  padding: 4px 12px;
  background-color: var(--color-accent-soft);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-weight: 500;
  color: var(--color-accent);
}

.feature-info h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-text);
}

.feature-info p {
  font-size: var(--font-size-sm);
  line-height: 1.7;
  color: var(--color-text-secondary);
  flex: 1;
}

.feature-info a,
.sub-card a,
.period-item a,
.event-card a,
.people-card a,
.guide-card a {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-accent);
}

.feature-info a:hover,
.sub-card a:hover,
.period-item a:hover,
.event-card a:hover,
.people-card a:hover,
.guide-card a:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

.sub-card-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--grid-gap);
}

.sub-card {
  display: flex;
  flex-direction: column;
}

.sub-card img {
  height: 140px;
}

.sub-card h3 {
  padding: 16px 16px 4px;
  font-size: var(--font-size-base);
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-text);
}

.sub-card p {
  padding: 0 16px 8px;
  font-size: var(--font-size-sm);
  line-height: 1.6;
  color: var(--color-text-secondary);
  flex: 1;
}

.sub-card a {
  display: block;
  padding: 0 16px 16px;
}

/* ---------- 时期索引预览 ---------- */
.period-preview {
  padding: 40px 0;
}

.timeline-simple {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--grid-gap);
}

.period-item {
  background-color: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.period-item:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.period-name {
  display: inline-block;
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 10px;
}

.period-item p {
  font-size: var(--font-size-sm);
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}

/* ---------- 事件目录预览 ---------- */
.event-preview {
  padding: 40px 0;
}

.event-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--grid-gap);
}

.event-card {
  padding: 24px;
  display: flex;
  flex-direction: column;
}

.event-date {
  display: inline-block;
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  margin-bottom: 8px;
}

.event-card h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
  line-height: 1.4;
}

.event-card p {
  font-size: var(--font-size-sm);
  line-height: 1.7;
  color: var(--color-text-secondary);
  flex: 1;
  margin-bottom: 12px;
}

/* ---------- 人物档案预览 ---------- */
.people-preview {
  padding: 40px 0;
}

.people-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--grid-gap);
}

.people-card {
  padding: 24px;
  display: flex;
  flex-direction: column;
}

.role-tag {
  display: inline-block;
  align-self: flex-start;
  padding: 4px 12px;
  background-color: rgba(88, 166, 255, 0.12);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-weight: 500;
  color: var(--color-blue);
  margin-bottom: 12px;
}

.people-card h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
  line-height: 1.4;
}

.people-card p {
  font-size: var(--font-size-sm);
  line-height: 1.7;
  color: var(--color-text-secondary);
  flex: 1;
  margin-bottom: 12px;
}

/* ---------- 资料来源与入口核验 ---------- */
.source-guide {
  padding: 40px 0;
}

.two-col-guide {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--grid-gap);
}

.guide-card {
  padding: 28px;
  display: flex;
  flex-direction: column;
}

.guide-card h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 10px;
}

.guide-card p {
  font-size: var(--font-size-sm);
  line-height: 1.7;
  color: var(--color-text-secondary);
  flex: 1;
  margin-bottom: 16px;
}

/* ---------- 首页 FAQ 摘选 ---------- */
.faq-preview {
  padding: 40px 0 56px;
}

.faq-preview .faq-list {
  margin-bottom: 20px;
}

.more-faq {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 10px 24px;
  background-color: var(--color-accent);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: #0d1117;
  transition: background-color var(--transition-fast);
}

.more-faq:hover {
  background-color: var(--color-accent-hover);
  color: #0d1117;
}

/* ==========================================================================
   Pages - 内页通用布局
   ========================================================================== */

.inner-main {
  padding-top: 0;
  padding-bottom: 64px;
}

/* 主内容 + 侧栏布局 */
.page-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 40px;
  align-items: start;
  padding-top: 8px;
}

.main-content {
  min-width: 0;
}

.sidebar {
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.sidebar-inner {
  background-color: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.sidebar-inner h2 {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.sidebar-links {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sidebar-links a {
  display: block;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.sidebar-links a:hover {
  background-color: var(--color-accent-soft);
  color: var(--color-accent);
}

.sidebar-note {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
  font-size: var(--font-size-xs);
  line-height: 1.6;
  color: var(--color-text-secondary);
}

/* 侧栏卡片（feedback 页） */
.sidebar-card {
  background-color: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 20px;
}

.sidebar-card h3 {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 14px;
}

.sidebar-card .sidebar-links {
  margin-bottom: 12px;
}

/* ==========================================================================
   Pages - 时期索引 periods.html
   ========================================================================== */

.intro-section {
  padding: 24px 0 8px;
}

.intro-section p {
  font-size: var(--font-size-base);
  line-height: 1.75;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
  max-width: 780px;
}

.period-list-section {
  padding: 24px 0;
}

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

.period-list .period-item {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 24px;
  align-items: start;
  padding: 24px;
}

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

.period-badge {
  display: inline-block;
  align-self: flex-start;
  padding: 4px 12px;
  background-color: var(--color-accent-soft);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-accent);
}

.period-time {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

.period-content h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.period-desc {
  font-size: var(--font-size-sm);
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}

/* 相关分类区块 */
.related-categories {
  padding: 32px 0;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--grid-gap);
}

.category-card {
  padding: 24px;
  display: flex;
  flex-direction: column;
}

.category-name {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.category-desc {
  font-size: var(--font-size-sm);
  line-height: 1.7;
  color: var(--color-text-secondary);
  flex: 1;
  margin-bottom: 12px;
}

/* 归档入口 */
.archive-links {
  padding: 24px 0;
}

.archive-intro {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

.archive-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.archive-list li {
  display: inline-flex;
}

.archive-list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 10px 20px;
  background-color: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

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

/* 时期配图 */
.period-figure {
  margin-top: 32px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.period-figure img {
  height: 260px;
}

.period-figure figcaption {
  padding: 12px 20px;
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  background-color: var(--color-panel);
}

/* ==========================================================================
   Pages - 事件目录 events.html
   ========================================================================== */

.event-filter-intro {
  padding: 24px 0 8px;
}

.event-filter-intro p {
  font-size: var(--font-size-base);
  line-height: 1.75;
  color: var(--color-text-secondary);
  max-width: 780px;
}

.event-list-section {
  padding: 24px 0;
}

.event-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--grid-gap);
}

.event-card {
  display: flex;
  flex-direction: column;
  padding: 0;
}

.event-card-media {
  height: 180px;
  border-bottom: 1px solid var(--color-border);
}

.event-card-body {
  padding: 20px 24px 24px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.event-card-body h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
}

.event-meta {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  margin-bottom: 10px;
}

.event-summary {
  font-size: var(--font-size-sm);
  line-height: 1.7;
  color: var(--color-text-secondary);
  flex: 1;
  margin-bottom: 12px;
}

.event-order {
  font-size: var(--font-size-sm);
  line-height: 1.6;
  color: var(--color-text-secondary);
  padding: 10px 14px;
  background-color: var(--color-panel-light);
  border-radius: var(--radius-sm);
}

.event-order strong {
  color: var(--color-accent);
  font-weight: 600;
  margin-right: 4px;
}

/* 相关人物与专题链接 */
.related-links-section {
  padding: 32px 0;
}

.related-links-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--grid-gap);
}

.related-card {
  padding: 24px;
  display: flex;
  flex-direction: column;
}

.related-card h3 {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.related-card p {
  font-size: var(--font-size-sm);
  line-height: 1.7;
  color: var(--color-text-secondary);
  flex: 1;
  margin-bottom: 12px;
}

/* 分页式归档提示 */
.archive-pagination {
  padding: 16px 0;
}

.archive-pagination p {
  display: inline-flex;
  align-items: center;
  padding: 12px 20px;
  background-color: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.archive-entries {
  padding: 16px 0;
}

.archive-entries p {
  font-size: var(--font-size-sm);
  line-height: 1.8;
  color: var(--color-text-secondary);
}

.archive-entries a {
  color: var(--color-accent);
  margin-right: 16px;
}

.archive-entries a:hover {
  text-decoration: underline;
}

/* ==========================================================================
   Pages - 人物档案 people.html
   ========================================================================== */

.people-intro {
  padding: 24px 0 8px;
}

.people-intro p {
  font-size: var(--font-size-base);
  line-height: 1.75;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
  max-width: 780px;
}

.people-list-section {
  padding: 24px 0;
}

.people-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--grid-gap);
}

.people-card {
  display: flex;
  flex-direction: column;
  padding: 0;
}

.people-card-media {
  height: 160px;
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-panel-light);
}

.people-card-body {
  padding: 20px 24px 24px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.people-card-body h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
}

.people-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
}

.people-tags span {
  display: inline-block;
  padding: 3px 10px;
  background-color: rgba(88, 166, 255, 0.12);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  color: var(--color-blue);
}

.people-desc {
  font-size: var(--font-size-sm);
  line-height: 1.7;
  color: var(--color-text-secondary);
  flex: 1;
  margin-bottom: 12px;
}

.people-links {
  font-size: var(--font-size-sm);
  color: var(--color-accent);
}

.people-links a:hover {
  text-decoration: underline;
}

/* 相关事件与专题推荐 */
.people-recommend {
  padding: 32px 0;
}

.recommend-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--grid-gap);
}

.recommend-card {
  padding: 24px;
  display: flex;
  flex-direction: column;
}

.recommend-card h3 {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.recommend-card p {
  font-size: var(--font-size-sm);
  line-height: 1.7;
  color: var(--color-text-secondary);
  flex: 1;
  margin-bottom: 12px;
}

.recommend-card a {
  font-size: var(--font-size-sm);
  color: var(--color-accent);
}

.recommend-card a:hover {
  text-decoration: underline;
}

/* ==========================================================================
   Pages - 专题研究 research.html
   ========================================================================== */

.research-list {
  padding: 24px 0;
}

.research-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--grid-gap);
}

.research-card {
  display: flex;
  flex-direction: column;
  padding: 0;
}

.research-media {
  height: 180px;
  border-bottom: 1px solid var(--color-border);
}

.research-body {
  padding: 20px 24px 24px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.research-tag {
  display: inline-block;
  align-self: flex-start;
  padding: 4px 12px;
  background-color: var(--color-accent-soft);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-weight: 500;
  color: var(--color-accent);
  margin-bottom: 10px;
}

.research-body h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
  line-height: 1.4;
}

.research-body p {
  font-size: var(--font-size-sm);
  line-height: 1.7;
  color: var(--color-text-secondary);
  flex: 1;
  margin-bottom: 12px;
}

.research-body a {
  font-size: var(--font-size-sm);
  color: var(--color-accent);
  font-weight: 500;
}

.research-body a:hover {
  text-decoration: underline;
}

/* 解读摘要模块 */
.research-highlight {
  padding: 32px 0;
}

.highlight-card {
  background-color: var(--color-panel);
  border: 1px solid rgba(255, 122, 24, 0.4);
  border-radius: var(--radius-lg);
  padding: 32px;
}

.highlight-content {
  max-width: 760px;
}

.highlight-label {
  display: inline-block;
  padding: 4px 12px;
  background-color: var(--color-accent);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: #0d1117;
  margin-bottom: 16px;
}

.highlight-content h3 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 12px;
  line-height: 1.4;
}

.highlight-content p {
  font-size: var(--font-size-base);
  line-height: 1.75;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

.highlight-content a {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-accent);
}

.highlight-content a:hover {
  text-decoration: underline;
}

/* 相关时期与事件链接 */
.research-related {
  padding: 24px 0;
}

.related-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--grid-gap);
}

.related-link {
  display: block;
  background-color: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.related-link:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.related-link-title {
  display: block;
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
}

.related-link-desc {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   Pages - 资料来源 materials.html
   ========================================================================== */

.verify-steps {
  padding: 24px 0;
}

.steps-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--grid-gap);
}

.step-item {
  background-color: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  position: relative;
}

.step-item h3 {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 10px;
  padding-top: 28px;
  position: relative;
}

.step-item h3::before {
  content: attr(data-step);
  position: absolute;
  top: 0;
  left: 0;
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-accent);
  background-color: var(--color-accent-soft);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
}

.step-item p {
  font-size: var(--font-size-sm);
  line-height: 1.7;
  color: var(--color-text-secondary);
}

/* 观看指南 */
.watching-guide {
  padding: 32px 0;
}

.guide-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--grid-gap);
}

.guide-card {
  padding: 24px;
}

.guide-card h3 {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 10px;
}

.guide-card p {
  font-size: var(--font-size-sm);
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

/* 下载官网与 APP 说明 */
.download-info {
  padding: 32px 0;
}

.download-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--grid-gap);
}

.download-card {
  padding: 24px;
}

.download-card h3 {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 10px;
}

.download-card p {
  font-size: var(--font-size-sm);
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: 8px;
}

.download-card p:last-child {
  margin-bottom: 0;
}

/* 相关页面入口 */
.related-links .link-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--grid-gap);
}

/* 材料配图 */
.material-figure {
  margin-top: 32px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

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

.material-figure figcaption {
  padding: 12px 20px;
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  background-color: var(--color-panel);
}

/* ==========================================================================
   Pages - 问题反馈 feedback.html
   ========================================================================== */

.faq-section {
  padding: 24px 0 8px;
}

.section-desc {
  font-size: var(--font-size-base);
  line-height: 1.75;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
  max-width: 780px;
}

/* 反馈流程说明 */
.feedback-flow-section {
  padding: 32px 0;
}

.flow-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--grid-gap);
  margin-bottom: 24px;
}

.flow-step {
  background-color: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  position: relative;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background-color: var(--color-accent);
  border-radius: 50%;
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: #0d1117;
  margin-bottom: 14px;
}

.flow-step h3 {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.flow-step p {
  font-size: var(--font-size-sm);
  line-height: 1.7;
  color: var(--color-text-secondary);
}

.flow-figure {
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

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

.flow-figure figcaption {
  padding: 12px 20px;
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  background-color: var(--color-panel);
}

/* 内容边界声明 */
.boundary-section {
  padding: 32px 0;
}

.boundary-section p {
  font-size: var(--font-size-base);
  line-height: 1.75;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
  max-width: 780px;
}

.boundary-section p:last-child {
  margin-bottom: 0;
}

/* ==========================================================================
   Pages - 404 页面
   ========================================================================== */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
  flex: 1;
}

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

.error-code {
  font-size: 72px;
  font-weight: 800;
  line-height: 1;
  color: var(--color-accent);
  margin-bottom: 16px;
}

.error-panel h1 {
  font-size: var(--font-size-h1);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 12px;
}

.error-desc {
  font-size: var(--font-size-base);
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: 28px;
}

.btn-back-home {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 32px;
  background-color: var(--color-accent);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: 600;
  color: #0d1117;
  transition: background-color var(--transition-fast);
}

.btn-back-home:hover {
  background-color: var(--color-accent-hover);
  color: #0d1117;
}

/* ==========================================================================
   Responsive - 响应式断点
   ========================================================================== */

/* ---------- 平板与窄屏（≤1024px） ---------- */
@media (max-width: 1024px) {
  :root {
    --container-padding: 20px;
    --section-gap: 48px;
  }

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

  .hero-visual {
    min-height: 280px;
  }

  .grid-featured {
    grid-template-columns: 1fr;
  }

  .feature-card img {
    height: 220px;
  }

  .sub-card-group {
    grid-template-columns: repeat(3, 1fr);
  }

  .sub-card img {
    height: 120px;
  }

  .page-layout {
    grid-template-columns: 1fr 260px;
    gap: 32px;
  }

  .event-grid,
  .people-grid,
  .research-grid {
    grid-template-columns: 1fr 1fr;
  }

  .flow-steps {
    grid-template-columns: 1fr 1fr;
  }
}

/* ---------- 移动端（≤768px） ---------- */
@media (max-width: 768px) {
  :root {
    --font-size-h1: 26px;
    --font-size-h2: 21px;
    --font-size-h3: 18px;
    --container-padding: 16px;
    --section-gap: 40px;
  }

  /* 页头导航 */
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-panel);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-card);
  }

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

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

  .nav-list a {
    display: block;
    padding: 12px 16px;
    border-radius: var(--radius-md);
  }

  /* 首页首屏 */
  .hero-focus {
    padding: 32px 0 24px;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .hero-visual {
    min-height: 220px;
    max-height: 300px;
  }

  .hero-copy {
    padding: 24px;
  }

  .hero-copy h1 {
    font-size: 24px;
  }

  .hero-quick-entry {
    grid-template-columns: 1fr 1fr;
  }

  /* 频道标签 */
  .channel-tags {
    padding: 24px 0;
  }

  .tag-list {
    gap: 10px;
  }

  .tag-chip {
    min-height: 40px;
    padding: 8px 16px;
    font-size: var(--font-size-xs);
  }

  /* 最新内容 */
  .latest-grid,
  .period-preview,
  .event-preview,
  .people-preview,
  .source-guide,
  .faq-preview {
    padding: 24px 0;
  }

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

  .sub-card {
    flex-direction: row;
    align-items: center;
  }

  .sub-card img {
    width: 120px;
    height: 90px;
    flex-shrink: 0;
  }

  .sub-card h3 {
    padding: 12px 12px 4px;
    font-size: var(--font-size-base);
  }

  .sub-card p {
    padding: 0 12px 4px;
  }

  .sub-card a {
    padding: 0 12px 12px;
  }

  /* 时期、事件、人物预览 */
  .timeline-simple,
  .event-cards,
  .people-cards,
  .category-grid,
  .recommend-grid {
    grid-template-columns: 1fr;
  }

  /* 资料来源 */
  .two-col-guide,
  .guide-grid,
  .download-grid,
  .link-grid,
  .related-links-grid,
  .related-links {
    grid-template-columns: 1fr;
  }

  /* 内页 */
  .inner-main {
    padding-bottom: 48px;
  }

  .breadcrumb {
    padding-top: 16px;
    font-size: var(--font-size-xs);
  }

  .page-header {
    padding: 20px 0 16px;
  }

  .page-description {
    font-size: var(--font-size-base);
  }

  /* 内页侧栏布局 */
  .page-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .sidebar {
    position: static;
  }

  /* 时期列表 */
  .period-list .period-item {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 20px;
  }

  .period-meta {
    flex-direction: row;
    align-items: center;
    gap: 12px;
  }

  /* 事件与人物列表 */
  .event-grid,
  .people-grid,
  .research-grid {
    grid-template-columns: 1fr;
  }

  .event-card-media {
    height: 160px;
  }

  .people-card-media {
    height: 140px;
  }

  /* 步骤列表 */
  .steps-list,
  .flow-steps {
    grid-template-columns: 1fr;
  }

  /* 页脚 */
  .footer-top {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-top: 40px;
    padding-bottom: 32px;
  }

  .footer-desc {
    max-width: 100%;
  }

  .footer-bottom {
    padding-top: 16px;
    padding-bottom: 20px;
  }

  /* 404 */
  .error-main {
    padding: 60px 16px;
  }

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

/* ---------- 小屏手机（≤480px） ---------- */
@media (max-width: 480px) {
  :root {
    --container-padding: 14px;
  }

  .hero-quick-entry {
    grid-template-columns: 1fr;
  }

  .entry-link {
    min-height: 44px;
  }

  .hero-copy h1 {
    font-size: 22px;
  }

  .feature-info {
    padding: 20px;
  }

  .feature-info h3 {
    font-size: var(--font-size-lg);
  }

  .sub-card {
    flex-direction: column;
    align-items: stretch;
  }

  .sub-card img {
    width: 100%;
    height: 140px;
  }

  .sub-card h3,
  .sub-card p,
  .sub-card a {
    padding-left: 16px;
    padding-right: 16px;
  }

  .faq-item summary {
    padding: 14px 16px;
    font-size: var(--font-size-sm);
  }

  .faq-answer,
  .faq-item[open] p {
    padding: 0 16px 14px;
    font-size: var(--font-size-xs);
  }

  .period-list .period-item {
    padding: 16px;
  }

  .event-card-body,
  .people-card-body,
  .research-body {
    padding: 16px 16px 20px;
  }

  .highlight-card {
    padding: 24px;
  }

  .highlight-content h3 {
    font-size: var(--font-size-lg);
  }

  .archive-list {
    flex-direction: column;
    align-items: stretch;
  }

  .archive-list a {
    justify-content: center;
  }
}