/* ==========================================================
   大象传媒 · 全站样式表
   版本：1.0
   说明：覆盖全站 8 个页面的完整样式
   ========================================================== */

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

:root {
  --color-primary: #0F766E;
  --color-primary-dark: #0B5C56;
  --color-primary-light: #14B8A6;
  --color-accent: #D97706;
  --color-accent-light: #F59E0B;
  --color-bg: #F5F5F4;
  --color-surface: #FFFFFF;
  --color-text: #1C1917;
  --color-text-light: #57534E;
  --color-text-lighter: #78716C;
  --color-border: #E7E5E4;
  --color-border-dark: #D6D3D1;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Microsoft YaHei", sans-serif;

  --container-width: 1200px;
  --container-padding: 24px;
  --header-height: 64px;

  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;

  --shadow-sm: 0 1px 2px rgba(28, 25, 23, 0.06);
  --shadow-md: 0 4px 12px rgba(28, 25, 23, 0.08);
  --shadow-lg: 0 8px 24px rgba(28, 25, 23, 0.1);

  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.4;
  color: var(--color-text);
}

h1 {
  font-size: 32px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 18px;
}

p {
  color: var(--color-text-light);
}

figure {
  margin: 0;
}

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

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

/* ==========================================================
   Layout — 全站布局骨架
   ========================================================== */

/* ---------- 页头 ---------- */

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

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

.brand-logo {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.02em;
  flex-shrink: 0;
}

.brand-logo:hover {
  color: var(--color-primary-dark);
}

/* ---------- 主导航 ---------- */

.site-nav {
  display: flex;
  align-items: center;
}

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

.nav-list li a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text-light);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-list li a:hover {
  color: var(--color-primary);
  background-color: rgba(15, 118, 110, 0.06);
}

.nav-list li a.is-current {
  color: var(--color-primary);
  background-color: rgba(15, 118, 110, 0.1);
  font-weight: 600;
}

/* 移动端汉堡按钮，默认隐藏 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.nav-toggle:hover {
  background-color: var(--color-bg);
}

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 1px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

/* ---------- 主内容区 ---------- */

.site-main {
  min-height: 60vh;
}

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

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

/* ---------- 面包屑 ---------- */

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 20px 0 16px;
  font-size: 14px;
  color: var(--color-text-lighter);
}

.breadcrumb a {
  color: var(--color-text-lighter);
  transition: color var(--transition-fast);
}

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

.breadcrumb-sep {
  color: var(--color-border-dark);
  user-select: none;
}

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

/* ---------- 页头标题区 ---------- */

.page-header {
  padding: 8px 0 32px;
}

.page-title {
  font-size: 32px;
  color: var(--color-text);
  margin-bottom: 8px;
}

.page-description {
  font-size: 16px;
  color: var(--color-text-light);
  max-width: 720px;
  line-height: 1.7;
}

/* ---------- 页脚 ---------- */

.site-footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  margin-top: 64px;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px var(--container-padding) 32px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
}

.footer-brand {
  padding-right: 24px;
}

.footer-logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.footer-desc {
  font-size: 14px;
  color: var(--color-text-lighter);
  line-height: 1.7;
}

.footer-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 16px;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links li a {
  font-size: 14px;
  color: var(--color-text-light);
  transition: color var(--transition-fast);
}

.footer-links li a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding: 20px var(--container-padding);
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: var(--color-text-lighter);
}

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

/* ---------- 区块标题 ---------- */

.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.section-title {
  font-size: 24px;
  color: var(--color-text);
  position: relative;
  padding-left: 14px;
}

.section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 20px;
  background-color: var(--color-primary);
  border-radius: 2px;
}

.section-title-sm {
  font-size: 18px;
  color: var(--color-text);
  margin-bottom: 16px;
}

/* ---------- 更多链接 ---------- */

.link-more {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: color var(--transition-fast);
}

.link-more::after {
  content: "→";
  font-size: 16px;
  line-height: 1;
}

.link-more:hover {
  color: var(--color-primary-dark);
}

.link-text {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: color var(--transition-fast);
}

.link-text::after {
  content: "→";
  font-size: 15px;
  line-height: 1;
}

.link-text:hover {
  color: var(--color-primary-dark);
}

/* ---------- 类型标签 ---------- */

.tag-label {
  display: inline-block;
  padding: 3px 10px;
  font-size: 12px;
  font-weight: 500;
  color: var(--color-accent);
  background-color: rgba(217, 119, 6, 0.1);
  border-radius: 999px;
  line-height: 1.5;
}

.type-tag {
  display: inline-block;
  padding: 2px 10px;
  font-size: 12px;
  font-weight: 500;
  color: var(--color-accent);
  background-color: rgba(217, 119, 6, 0.1);
  border-radius: 999px;
  line-height: 1.5;
}

/* ---------- 按钮 ---------- */

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  color: #FFFFFF;
  background-color: var(--color-primary);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast), transform var(--transition-fast);
  min-height: 44px;
}

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

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  background-color: var(--color-surface);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
  min-height: 44px;
}

.btn-secondary:hover {
  background-color: rgba(15, 118, 110, 0.06);
  color: var(--color-primary-dark);
  transform: translateY(-1px);
}

/* ---------- 相关链接（通用） ---------- */

.related-links {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.related-links-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  margin-right: 16px;
}

.related-links-item {
  display: inline-block;
  margin: 4px 12px 4px 0;
  font-size: 14px;
  color: var(--color-primary);
  transition: color var(--transition-fast);
}

.related-links-item:hover {
  color: var(--color-primary-dark);
}

/* ==========================================================
   Pages — 首页
   ========================================================== */

/* ---------- 首屏 Hero ---------- */

.home-hero {
  padding: 48px 0 40px;
}

.hero-layout {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 40px;
  align-items: stretch;
}

.hero-categories {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.hero-title {
  font-size: 32px;
  color: var(--color-text);
  margin-bottom: 12px;
}

.hero-desc {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 28px;
  line-height: 1.7;
}

.category-index {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}

.category-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  background-color: var(--color-bg);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
  min-height: 72px;
}

.category-item:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}

.category-dot {
  flex-shrink: 0;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-top: 7px;
  background-color: var(--color-primary);
}

.dot-film {
  background-color: #0F766E;
}

.dot-drama {
  background-color: #D97706;
}

.dot-documentary {
  background-color: #0284C7;
}

.dot-animation {
  background-color: #7C3AED;
}

.dot-variety {
  background-color: #DC2626;
}

.dot-short {
  background-color: #059669;
}

.category-name {
  display: block;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.4;
  margin-bottom: 2px;
}

.category-brief {
  display: block;
  font-size: 13px;
  color: var(--color-text-lighter);
  line-height: 1.5;
}

.link-more {
  margin-top: 8px;
}

/* ---------- 编辑精选 ---------- */

.hero-featured {
  display: flex;
  flex-direction: column;
}

.hero-featured .section-title-sm {
  padding-left: 14px;
  position: relative;
}

.hero-featured .section-title-sm::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 16px;
  background-color: var(--color-accent);
  border-radius: 2px;
}

.featured-card {
  display: flex;
  gap: 16px;
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 16px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
  margin-bottom: 16px;
}

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

.featured-media {
  flex-shrink: 0;
  width: 120px;
  height: 90px;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-bg);
}

.featured-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.featured-body {
  flex: 1;
  min-width: 0;
}

.featured-body .tag-label {
  margin-bottom: 6px;
}

.featured-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
  line-height: 1.4;
}

.featured-summary {
  font-size: 13px;
  color: var(--color-text-lighter);
  line-height: 1.6;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ---------- 最新更新 ---------- */

.latest-updates {
  padding: 40px 0;
  border-top: 1px solid var(--color-border);
}

.update-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.update-item {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 20px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

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

.update-date {
  display: block;
  font-size: 13px;
  color: var(--color-text-lighter);
  margin-bottom: 10px;
}

.update-title {
  display: block;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 10px;
  line-height: 1.5;
  transition: color var(--transition-fast);
}

.update-title:hover {
  color: var(--color-primary);
}

/* ---------- 专题精选 ---------- */

.featured-topics {
  padding: 40px 0;
  border-top: 1px solid var(--color-border);
}

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

.topic-card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

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

.topic-media {
  width: 100%;
  height: 180px;
  overflow: hidden;
  background-color: var(--color-bg);
}

.topic-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.topic-body {
  padding: 20px;
}

.topic-body .tag-label {
  margin-bottom: 8px;
}

.topic-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
  line-height: 1.5;
}

.topic-summary {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ---------- 观看指南入口 ---------- */

.guide-entry {
  padding: 48px 0;
  border-top: 1px solid var(--color-border);
}

.guide-content {
  background-color: var(--color-primary);
  border-radius: var(--radius-lg);
  padding: 40px;
  text-align: center;
}

.guide-content .section-title {
  color: #FFFFFF;
  margin-bottom: 12px;
}

.guide-content .section-title::before {
  background-color: var(--color-accent);
}

.guide-desc {
  font-size: 15px;
  color: rgba(255, 255, 255, 0.85);
  max-width: 560px;
  margin: 0 auto 24px;
  line-height: 1.7;
}

.guide-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 16px;
}

.guide-content .btn-primary {
  background-color: var(--color-accent);
}

.guide-content .btn-primary:hover {
  background-color: var(--color-accent-light);
}

.guide-content .btn-secondary {
  border-color: rgba(255, 255, 255, 0.6);
  color: #FFFFFF;
}

.guide-content .btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.1);
  color: #FFFFFF;
}

.guide-note {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.7);
}

.guide-note a {
  color: rgba(255, 255, 255, 0.9);
  text-decoration: underline;
  transition: color var(--transition-fast);
}

.guide-note a:hover {
  color: #FFFFFF;
}

/* ==========================================================
   Pages — 类型索引页（types.html）
   ========================================================== */

/* ---------- 类型锚点导航 ---------- */

.type-tags {
  margin-bottom: 40px;
}

.type-tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.type-tag-link {
  display: inline-block;
  padding: 8px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-light);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  transition: all var(--transition-fast);
}

.type-tag-link:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background-color: rgba(15, 118, 110, 0.04);
}

/* ---------- 类型内容区块 ---------- */

.type-block {
  margin-bottom: 48px;
  scroll-margin-top: calc(var(--header-height) + 20px);
}

.type-block-head {
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-border);
}

.type-block-title {
  font-size: 22px;
  color: var(--color-text);
  margin-bottom: 6px;
}

.type-block-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
}

.type-items {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.type-item {
  display: flex;
  gap: 16px;
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 16px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

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

.type-item-figure {
  flex-shrink: 0;
  width: 140px;
  height: 100px;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-bg);
}

.type-item-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.type-item-body {
  flex: 1;
  min-width: 0;
}

.type-item-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
  line-height: 1.4;
}

.type-item-tag {
  font-size: 12px;
  color: var(--color-accent);
  margin-bottom: 6px;
  font-weight: 500;
}

.type-item-summary {
  font-size: 13px;
  color: var(--color-text-lighter);
  line-height: 1.6;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.type-item-link {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-primary);
  transition: color var(--transition-fast);
}

.type-item-link:hover {
  color: var(--color-primary-dark);
}

/* ---------- 类型页相关链接 ---------- */

.type-related {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.related-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 16px;
}

.related-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.related-links a {
  display: inline-block;
  padding: 8px 18px;
  font-size: 14px;
  color: var(--color-primary);
  background-color: rgba(15, 118, 110, 0.06);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.related-links a:hover {
  background-color: rgba(15, 118, 110, 0.12);
  color: var(--color-primary-dark);
}

/* ==========================================================
   Pages — 作品目录页（library.html）
   ========================================================== */

/* ---------- 分组导航 ---------- */

.group-tabs {
  margin-bottom: 40px;
}

.group-tabs-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.group-tabs-list li a {
  display: inline-block;
  padding: 8px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-light);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  transition: all var(--transition-fast);
}

.group-tabs-list li a:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background-color: rgba(15, 118, 110, 0.04);
}

/* ---------- 作品分组列表 ---------- */

.library-group {
  margin-bottom: 48px;
  scroll-margin-top: calc(var(--header-height) + 20px);
}

.group-title {
  font-size: 22px;
  color: var(--color-text);
  margin-bottom: 6px;
}

.group-desc {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-border);
}

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

.library-item {
  display: flex;
  align-items: center;
  gap: 16px;
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  transition: box-shadow var(--transition-base), border-color var(--transition-fast);
}

.library-item:hover {
  box-shadow: var(--shadow-sm);
  border-color: var(--color-border-dark);
}

.library-thumb {
  flex-shrink: 0;
  width: 80px;
  height: 56px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background-color: var(--color-bg);
}

.library-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.library-info {
  flex: 1;
  min-width: 0;
}

.library-name {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
}

.library-name a {
  color: var(--color-text);
  transition: color var(--transition-fast);
}

.library-name a:hover {
  color: var(--color-primary);
}

.library-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 2px;
}

.library-meta .type-tag {
  font-size: 12px;
}

.update-time {
  font-size: 12px;
  color: var(--color-text-lighter);
}

.library-desc {
  font-size: 13px;
  color: var(--color-text-lighter);
  line-height: 1.5;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ---------- 作品目录页相关链接 ---------- */

.library-related {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.library-related .related-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
}

.library-related p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

.library-related p a {
  display: inline-block;
  margin-right: 16px;
  color: var(--color-primary);
  font-weight: 500;
  transition: color var(--transition-fast);
}

.library-related p a:hover {
  color: var(--color-primary-dark);
}

/* ==========================================================
   Pages — 专题文章页（topics.html）
   ========================================================== */

/* ---------- 主叙事专题 ---------- */

.featured-article {
  margin-bottom: 48px;
}

.featured-article .section-title {
  margin-bottom: 24px;
}

.featured-card {
  display: flex;
  gap: 24px;
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  padding: 0;
}

.featured-article .featured-media {
  flex-shrink: 0;
  width: 45%;
  height: auto;
  min-height: 280px;
  border-radius: 0;
  overflow: hidden;
  background-color: var(--color-bg);
}

.featured-article .featured-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.featured-article .featured-body {
  flex: 1;
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.featured-tag {
  display: inline-block;
  align-self: flex-start;
  padding: 3px 12px;
  font-size: 12px;
  font-weight: 500;
  color: var(--color-accent);
  background-color: rgba(217, 119, 6, 0.1);
  border-radius: 999px;
  margin-bottom: 12px;
}

.featured-heading {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 12px;
  line-height: 1.4;
}

.featured-summary {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 12px;
  display: block;
  -webkit-line-clamp: unset;
}

.featured-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  margin-top: 8px;
  transition: color var(--transition-fast);
}

.featured-link::after {
  content: "→";
  font-size: 16px;
}

.featured-link:hover {
  color: var(--color-primary-dark);
}

/* ---------- 延伸阅读网格 ---------- */

.article-grid {
  margin-bottom: 48px;
}

.article-grid .section-title {
  margin-bottom: 24px;
}

.article-grid-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.article-card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

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

.article-media {
  width: 100%;
  height: 140px;
  overflow: hidden;
  background-color: var(--color-bg);
}

.article-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.article-body {
  padding: 16px;
}

.article-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.article-heading {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
  line-height: 1.5;
}

.article-summary {
  font-size: 13px;
  color: var(--color-text-lighter);
  line-height: 1.6;
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-link {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-primary);
  transition: color var(--transition-fast);
}

.article-link:hover {
  color: var(--color-primary-dark);
}

/* ---------- 专题页相关链接 ---------- */

.topics-page-related {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

/* ==========================================================
   Pages — 观看指南页（guide.html）
   ========================================================== */

/* ---------- 观看步骤条 ---------- */

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

.guide-steps .section-title {
  margin-bottom: 24px;
}

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

.step-item {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 24px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  position: relative;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

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

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  font-size: 16px;
  font-weight: 700;
  color: #FFFFFF;
  background-color: var(--color-primary);
  border-radius: 50%;
  margin-bottom: 16px;
}

.step-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.step-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ---------- 设备说明 ---------- */

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

.guide-devices .section-title {
  margin-bottom: 24px;
}

.devices-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.device-card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 24px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.device-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.device-desc {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 16px;
  line-height: 1.6;
}

.device-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 8px;
}

.device-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  background-color: var(--color-primary);
  border-radius: 50%;
}

/* ---------- 指南配图 ---------- */

.guide-media {
  margin-bottom: 40px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
}

.guide-media img {
  width: 100%;
  height: 260px;
  object-fit: cover;
}

.guide-media figcaption {
  padding: 12px 20px;
  font-size: 13px;
  color: var(--color-text-lighter);
  background-color: var(--color-surface);
  text-align: center;
}

/* ---------- FAQ ---------- */

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

.guide-faq .section-title {
  margin-bottom: 24px;
}

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

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

.faq-question {
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  transition: background-color var(--transition-fast);
}

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

.faq-question::after {
  content: "+";
  flex-shrink: 0;
  font-size: 20px;
  font-weight: 400;
  color: var(--color-primary);
  transition: transform var(--transition-base);
}

.faq-item[open] .faq-question {
  background-color: rgba(15, 118, 110, 0.04);
}

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

.faq-answer {
  padding: 0 20px 16px;
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ---------- 更多帮助链接 ---------- */

.guide-more {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.guide-more .section-title {
  margin-bottom: 12px;
}

.more-desc {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 16px;
  line-height: 1.7;
}

.more-links li {
  margin-bottom: 10px;
}

.more-links li a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  transition: color var(--transition-fast);
}

.more-links li a::before {
  content: "→";
  font-size: 15px;
}

.more-links li a:hover {
  color: var(--color-primary-dark);
}

/* ==========================================================
   Pages — 更新记录页（updates.html）
   ========================================================== */

/* ---------- 月份跳转 ---------- */

.month-tabs {
  margin-bottom: 40px;
}

.month-tabs .section-title {
  margin-bottom: 20px;
}

.month-tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.month-tab {
  display: inline-block;
  padding: 8px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-light);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  transition: all var(--transition-fast);
}

.month-tab:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background-color: rgba(15, 118, 110, 0.04);
}

/* ---------- 更新分组 ---------- */

.update-groups {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.update-group {
  scroll-margin-top: calc(var(--header-height) + 20px);
}

.update-group .group-title {
  font-size: 20px;
  color: var(--color-text);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-primary);
  display: inline-block;
}

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

.update-item {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  border: 1px solid var(--color-border);
  transition: box-shadow var(--transition-base), border-color var(--transition-fast);
}

.update-item:hover {
  box-shadow: var(--shadow-sm);
  border-color: var(--color-border-dark);
}

.update-date {
  flex-shrink: 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  min-width: 80px;
  padding-top: 2px;
}

.update-content {
  flex: 1;
  min-width: 0;
}

.update-link {
  display: block;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
  line-height: 1.5;
  transition: color var(--transition-fast);
}

.update-link:hover {
  color: var(--color-primary);
}

.update-content .type-tag {
  margin-right: 8px;
}

.update-note {
  font-size: 13px;
  color: var(--color-text-lighter);
}

/* ---------- 更新配图 ---------- */

.updates-media {
  margin-top: 40px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
}

.updates-image {
  width: 100%;
  height: 240px;
  object-fit: cover;
}

.updates-media figcaption {
  padding: 12px 20px;
  font-size: 13px;
  color: var(--color-text-lighter);
  text-align: center;
}

/* ---------- 更新页相关链接 ---------- */

.updates-page-related {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.updates-page-related .section-title {
  margin-bottom: 16px;
}

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

.related-link {
  display: inline-block;
  padding: 8px 18px;
  font-size: 14px;
  color: var(--color-primary);
  background-color: rgba(15, 118, 110, 0.06);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.related-link:hover {
  background-color: rgba(15, 118, 110, 0.12);
  color: var(--color-primary-dark);
}

/* ==========================================================
   Pages — 站点说明页（about.html）
   ========================================================== */

/* ---------- 站点定位 ---------- */

.about-intro {
  margin-bottom: 48px;
}

.about-intro h2 {
  font-size: 22px;
  color: var(--color-text);
  margin-bottom: 20px;
  padding-left: 14px;
  position: relative;
}

.about-intro h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 18px;
  background-color: var(--color-primary);
  border-radius: 2px;
}

.about-intro-layout {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 40px;
  align-items: start;
}

.about-intro-text p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 16px;
}

.about-points {
  margin-top: 12px;
}

.about-points li {
  position: relative;
  padding-left: 24px;
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 10px;
}

.about-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  background-color: var(--color-accent);
  border-radius: 50%;
}

.about-points li strong {
  color: var(--color-text);
  font-weight: 600;
}

.about-figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
}

.about-figure img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.about-figure figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--color-text-lighter);
  text-align: center;
}

/* ---------- 内容边界 ---------- */

.about-boundaries {
  margin-bottom: 48px;
}

.about-boundaries h2 {
  font-size: 22px;
  color: var(--color-text);
  margin-bottom: 12px;
  padding-left: 14px;
  position: relative;
}

.about-boundaries h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 18px;
  background-color: var(--color-primary);
  border-radius: 2px;
}

.boundary-intro {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 24px;
  line-height: 1.7;
}

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

.boundary-card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 24px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

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

.boundary-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 10px;
}

.boundary-card p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ---------- 反馈方式 ---------- */

.feedback-note {
  margin-bottom: 48px;
}

.feedback-note h2 {
  font-size: 22px;
  color: var(--color-text);
  margin-bottom: 20px;
  padding-left: 14px;
  position: relative;
}

.feedback-note h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 18px;
  background-color: var(--color-primary);
  border-radius: 2px;
}

.feedback-layout {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.feedback-layout p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 16px;
}

.feedback-links {
  margin-bottom: 16px;
}

.feedback-links li {
  margin-bottom: 10px;
}

.feedback-links li a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  transition: color var(--transition-fast);
}

.feedback-links li a::before {
  content: "→";
  font-size: 15px;
}

.feedback-links li a:hover {
  color: var(--color-primary-dark);
}

.feedback-note-end {
  font-size: 13px;
  color: var(--color-text-lighter);
  margin-bottom: 0;
}

/* ---------- 相关阅读 ---------- */

.related-nav {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.related-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 16px;
}

.related-nav ul li {
  margin-bottom: 10px;
}

.related-nav ul li a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  transition: color var(--transition-fast);
}

.related-nav ul li a::before {
  content: "→";
  font-size: 15px;
}

.related-nav ul li a:hover {
  color: var(--color-primary-dark);
}

/* ==========================================================
   Pages — 404 错误页
   ========================================================== */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: 48px var(--container-padding);
}

.error-section {
  text-align: center;
  max-width: 480px;
}

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

.error-title {
  font-size: 24px;
  color: var(--color-text);
  margin-bottom: 12px;
}

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

.error-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 32px;
  font-size: 15px;
  font-weight: 600;
  color: #FFFFFF;
  background-color: var(--color-primary);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast), transform var(--transition-fast);
  min-height: 44px;
}

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

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

/* ---------- 平板（≤1024px） ---------- */

@media (max-width: 1024px) {
  .hero-layout {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .hero-featured {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .hero-featured .section-title-sm {
    grid-column: 1 / -1;
  }

  .hero-featured .featured-card {
    margin-bottom: 0;
  }

  .update-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .topic-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .article-grid-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-inner {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
  }

  .footer-brand {
    grid-column: 1 / -1;
    padding-right: 0;
  }

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

  .type-items {
    grid-template-columns: 1fr;
  }

  .featured-article .featured-media {
    width: 40%;
    min-height: 240px;
  }
}

/* ---------- 手机（≤768px） ---------- */

@media (max-width: 768px) {
  :root {
    --container-padding: 16px;
    --header-height: 56px;
  }

  h1 {
    font-size: 26px;
  }

  h2 {
    font-size: 20px;
  }

  /* 移动端导航 */
  .nav-toggle {
    display: flex;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: stretch;
    padding: 8px var(--container-padding) 16px;
    box-shadow: var(--shadow-md);
  }

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

  .nav-list li a {
    padding: 12px 16px;
    font-size: 16px;
    border-radius: var(--radius-md);
  }

  /* 首页 */
  .home-hero {
    padding: 24px 0;
  }

  .hero-categories {
    padding: 20px;
  }

  .category-index {
    grid-template-columns: 1fr;
  }

  .hero-featured {
    display: flex;
    flex-direction: column;
  }

  .hero-featured .section-title-sm {
    grid-column: auto;
  }

  .featured-card {
    margin-bottom: 12px;
  }

  .featured-media {
    width: 100px;
    height: 76px;
  }

  .latest-updates {
    padding: 32px 0;
  }

  .update-list {
    grid-template-columns: 1fr;
  }

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

  .topic-media {
    height: 160px;
  }

  .guide-entry {
    padding: 32px 0;
  }

  .guide-content {
    padding: 24px 16px;
  }

  .guide-actions {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }

  .guide-actions a {
    width: 100%;
  }

  /* 内页 */
  .inner-main {
    padding: 0 16px;
  }

  .breadcrumb {
    padding: 16px 0 12px;
    font-size: 13px;
    flex-wrap: wrap;
  }

  .page-header {
    padding: 4px 0 24px;
  }

  .page-title {
    font-size: 26px;
  }

  .page-description {
    font-size: 14px;
  }

  /* 类型页 */
  .type-tag-list,
  .group-tabs-list,
  .month-tab-list {
    gap: 8px;
  }

  .type-tag-link,
  .group-tabs-list li a,
  .month-tab {
    padding: 7px 14px;
    font-size: 13px;
  }

  .type-block-title {
    font-size: 20px;
  }

  .type-item {
    flex-direction: column;
  }

  .type-item-figure {
    width: 100%;
    height: 160px;
  }

  /* 作品目录页 */
  .library-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .library-thumb {
    width: 100%;
    height: 140px;
  }

  .library-desc {
    white-space: normal;
  }

  /* 专题页 */
  .featured-article .featured-card {
    flex-direction: column;
  }

  .featured-article .featured-media {
    width: 100%;
    height: 200px;
    min-height: 0;
  }

  .featured-article .featured-body {
    padding: 20px;
  }

  .featured-heading {
    font-size: 20px;
  }

  .article-grid-list {
    grid-template-columns: 1fr;
  }

  .article-media {
    height: 160px;
  }

  /* 指南页 */
  .steps-row {
    grid-template-columns: 1fr;
    gap: 16px;
  }

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

  .guide-media img {
    height: 180px;
  }

  .faq-question {
    font-size: 14px;
    padding: 14px 16px;
  }

  .faq-answer {
    padding: 0 16px 14px;
    font-size: 13px;
  }

  /* 更新页 */
  .update-item {
    flex-direction: column;
    gap: 8px;
  }

  .update-date {
    min-width: 0;
    font-size: 13px;
  }

  .update-content .type-tag {
    display: inline-block;
    margin-bottom: 4px;
  }

  .updates-image {
    height: 180px;
  }

  /* 站点说明页 */
  .about-intro-layout {
    grid-template-columns: 1fr;
  }

  .about-figure img {
    height: 180px;
  }

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

  .feedback-layout {
    padding: 20px;
  }

  /* 页脚 */
  .site-footer {
    margin-top: 48px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 32px 16px 24px;
  }

  .footer-brand {
    grid-column: auto;
    padding-right: 0;
  }

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

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

/* ---------- 小屏手机（≤390px） ---------- */

@media (max-width: 390px) {
  :root {
    --container-padding: 12px;
  }

  .brand-logo {
    font-size: 18px;
  }

  .hero-categories {
    padding: 16px;
  }

  .category-item {
    padding: 12px;
    min-height: 64px;
  }

  .featured-card {
    flex-direction: column;
  }

  .featured-media {
    width: 100%;
    height: 140px;
  }

  .topic-media {
    height: 140px;
  }

  .type-item-figure {
    height: 140px;
  }

  .library-thumb {
    height: 120px;
  }

  .article-media {
    height: 140px;
  }

  .guide-media img {
    height: 160px;
  }

  .updates-image {
    height: 160px;
  }

  .about-figure img {
    height: 160px;
  }

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

  .error-title {
    font-size: 20px;
  }
}