/* ========================================
   图文素材与视频索引导航 - 全局样式
   暗色高级感 · 瀑布流卡片 · 移动端优先
   ======================================== */

:root {
  --color-primary: #6c5ce7;
  --color-primary-light: #a29bfe;
  --color-primary-dark: #4a3db8;
  --color-accent: #00cec9;
  --color-accent-light: #81ecec;
  --color-bg-dark: #0a0a0f;
  --color-bg-card: #16161e;
  --color-bg-card-hover: #1e1e2a;
  --color-bg-section: #111118;
  --color-text-primary: #eaeaf0;
  --color-text-secondary: #9e9eb8;
  --color-text-muted: #6b6b80;
  --color-border: #2a2a3a;
  --color-border-light: #3a3a4a;
  --color-success: #00b894;
  --color-warning: #fdcb6e;
  --color-danger: #e17055;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 20px rgba(108,92,231,0.15);
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  --font-main: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", monospace;
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;
  --container-max: 1280px;
}

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

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

body {
  font-family: var(--font-main);
  background-color: var(--color-bg-dark);
  color: var(--color-text-primary);
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

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

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

ul, ol {
  list-style: none;
}

/* 容器 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* ========== 顶部导航 ========== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 10, 15, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-md) 0;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
}

.site-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-primary);
}

.site-logo img {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
}

.nav-main {
  display: none;
}

.nav-main.active {
  display: flex;
  flex-direction: column;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-bg-card);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-md);
  gap: var(--spacing-sm);
  animation: slideDown var(--transition-normal);
}

.nav-main a {
  color: var(--color-text-secondary);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  font-size: 0.95rem;
}

.nav-main a:hover,
.nav-main a.active {
  color: var(--color-text-primary);
  background: rgba(108, 92, 231, 0.1);
}

.menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-primary);
  cursor: pointer;
  font-size: 1.2rem;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.btn-search-toggle {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-search-toggle:hover {
  border-color: var(--color-primary);
  color: var(--color-primary-light);
}

/* ========== 首屏英雄区 ========== */
.hero-section {
  padding: var(--spacing-3xl) 0;
  text-align: center;
  background: linear-gradient(180deg, rgba(108,92,231,0.08) 0%, transparent 100%);
  border-bottom: 1px solid var(--color-border);
}

.hero-section h1 {
  font-size: clamp(1.8rem, 5vw, 3rem);
  font-weight: 800;
  margin-bottom: var(--spacing-md);
  background: linear-gradient(135deg, var(--color-text-primary), var(--color-primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--color-text-secondary);
  max-width: 680px;
  margin: 0 auto var(--spacing-xl);
  line-height: 1.8;
}

.hero-search {
  max-width: 560px;
  margin: 0 auto;
  position: relative;
}

.hero-search input {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-xl);
  padding-right: 56px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  color: var(--color-text-primary);
  font-size: 1rem;
  outline: none;
  transition: border-color var(--transition-fast);
}

.hero-search input:focus {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
}

.hero-search input::placeholder {
  color: var(--color-text-muted);
}

.hero-search button {
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  background: var(--color-primary);
  border: none;
  border-radius: 50%;
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast);
}

.hero-search button:hover {
  background: var(--color-primary-dark);
}

.search-suggestions {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-sm);
  display: none;
  z-index: 100;
}

.search-suggestions.active {
  display: block;
}

.search-suggestions a {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
}

.search-suggestions a:hover {
  background: rgba(108,92,231,0.1);
  color: var(--color-text-primary);
}

/* ========== 通用区块 ========== */
.section {
  padding: var(--spacing-2xl) 0;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-xl);
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text-primary);
  position: relative;
  padding-left: var(--spacing-md);
}

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

.section-more {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.section-more:hover {
  color: var(--color-primary-light);
}

/* ========== 瀑布流图文卡片 ========== */
.masonry-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-lg);
}

.media-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-normal);
  position: relative;
}

.media-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  background: var(--color-bg-card-hover);
}

.media-card-thumb {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/10;
  background: var(--color-bg-section);
}

.media-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.media-card:hover .media-card-thumb img {
  transform: scale(1.05);
}

.media-card-badge {
  position: absolute;
  top: var(--spacing-sm);
  left: var(--spacing-sm);
  padding: 2px 10px;
  background: rgba(108, 92, 231, 0.9);
  color: #fff;
  font-size: 0.75rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.media-card-play {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 48px;
  height: 48px;
  background: rgba(0, 0, 0, 0.7);
  border: 2px solid rgba(255,255,255,0.8);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.media-card:hover .media-card-play {
  opacity: 1;
}

.media-card-play::after {
  content: '';
  width: 0;
  height: 0;
  border-left: 14px solid #fff;
  border-top: 8px solid transparent;
  border-bottom: 8px solid transparent;
  margin-left: 3px;
}

.media-card-body {
  padding: var(--spacing-md);
}

.media-card-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.media-card-desc {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.media-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.media-card-source {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.media-card-source::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
}

/* ========== 版权提醒横幅 ========== */
.copyright-banner {
  background: linear-gradient(135deg, rgba(225, 112, 85, 0.1), rgba(253, 203, 110, 0.05));
  border: 1px solid rgba(225, 112, 85, 0.3);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
}

.copyright-banner-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.copyright-banner-text {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.copyright-banner-text strong {
  color: var(--color-warning);
}

/* ========== 来源标签 ========== */
.source-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.source-tag {
  padding: var(--spacing-xs) var(--spacing-md);
  background: rgba(108, 92, 231, 0.1);
  border: 1px solid rgba(108, 92, 231, 0.3);
  border-radius: var(--radius-xl);
  font-size: 0.8rem;
  color: var(--color-primary-light);
  transition: all var(--transition-fast);
}

.source-tag:hover {
  background: rgba(108, 92, 231, 0.2);
  border-color: var(--color-primary);
}

/* ========== 榜单/排行 ========== */
.rank-tabs {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
  overflow-x: auto;
  padding-bottom: var(--spacing-sm);
}

.rank-tab {
  padding: var(--spacing-sm) var(--spacing-lg);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.rank-tab:hover,
.rank-tab.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.rank-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.rank-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.rank-item:hover {
  border-color: var(--color-primary);
  background: var(--color-bg-card-hover);
}

.rank-num {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-section);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-text-muted);
  flex-shrink: 0;
}

.rank-item:nth-child(1) .rank-num {
  background: var(--color-primary);
  color: #fff;
}

.rank-item:nth-child(2) .rank-num {
  background: var(--color-accent);
  color: #fff;
}

.rank-item:nth-child(3) .rank-num {
  background: var(--color-warning);
  color: #000;
}

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

.rank-title {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.rank-meta {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 2px;
}

.rank-heat {
  font-size: 0.8rem;
  color: var(--color-danger);
  font-weight: 600;
  flex-shrink: 0;
}

/* ========== FAQ ========== */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

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

.faq-question {
  padding: var(--spacing-md) var(--spacing-lg);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  font-weight: 500;
  color: var(--color-text-primary);
  transition: background var(--transition-fast);
}

.faq-question:hover {
  background: var(--color-bg-card-hover);
}

.faq-toggle {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--color-bg-section);
  color: var(--color-text-muted);
  font-size: 0.9rem;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.faq-item.active .faq-toggle {
  transform: rotate(45deg);
  background: var(--color-primary);
  color: #fff;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal);
}

.faq-answer-inner {
  padding: 0 var(--spacing-lg) var(--spacing-lg);
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.8;
}

.faq-item.active .faq-answer {
  max-height: 500px;
}

/* ========== 面包屑 ========== */
.breadcrumb {
  padding: var(--spacing-md) 0;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

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

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

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

/* ========== 按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-xl);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
}

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary-light);
}

.btn-accent {
  background: var(--color-accent);
  color: #000;
  font-weight: 600;
}

.btn-accent:hover {
  background: var(--color-accent-light);
  transform: translateY(-2px);
}

/* ========== 页脚 ========== */
.site-footer {
  background: var(--color-bg-section);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-brand {
  max-width: 320px;
}

.footer-brand-name {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.footer-brand-desc {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.footer-nav-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

.footer-nav-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

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

.footer-nav-list a:hover {
  color: var(--color-primary-light);
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: var(--spacing-lg);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-md);
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.footer-links a {
  color: var(--color-text-muted);
  font-size: 0.8rem;
}

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

/* ========== 返回顶部 ========== */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  background: var(--color-primary);
  border: none;
  border-radius: 50%;
  color: #fff;
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-normal);
  z-index: 999;
  box-shadow: var(--shadow-md);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-primary-dark);
  transform: translateY(-3px);
}

/* ========== PWA安装提示 ========== */
.pwa-prompt {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--color-bg-card);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  display: none;
  align-items: center;
  gap: var(--spacing-md);
  box-shadow: var(--shadow-lg);
  z-index: 998;
  max-width: 380px;
  width: calc(100% - 32px);
  transition: transform var(--transition-normal);
}

.pwa-prompt.visible {
  display: flex;
  transform: translateX(-50%) translateY(0);
}

.pwa-prompt-text {
  flex: 1;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

.pwa-prompt-close {
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: 1.2rem;
}

/* ========== 表单提示 ========== */
.toast {
  position: fixed;
  top: 80px;
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  background: var(--color-success);
  color: #fff;
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 500;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  z-index: 9999;
  box-shadow: var(--shadow-md);
}

.toast.visible {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

/* ========== 搜索页 ========== */
.search-page-input {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: 1rem;
  outline: none;
  margin-bottom: var(--spacing-lg);
}

.search-page-input:focus {
  border-color: var(--color-primary);
}

.search-results {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.search-result-item {
  padding: var(--spacing-lg);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast);
}

.search-result-item:hover {
  border-color: var(--color-primary);
}

.search-result-title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.search-result-title a {
  color: var(--color-primary-light);
}

.search-result-desc {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.search-result-path {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* ========== 内页通用 ========== */
.page-hero {
  padding: var(--spacing-2xl) 0;
  text-align: center;
  background: linear-gradient(180deg, rgba(108,92,231,0.05) 0%, transparent 100%);
  border-bottom: 1px solid var(--color-border);
}

.page-hero h1 {
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.page-hero p {
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
  font-size: 0.95rem;
}

.page-content {
  padding: var(--spacing-2xl) 0;
}

.page-content p {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.page-content h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin: var(--spacing-xl) 0 var(--spacing-md);
  color: var(--color-text-primary);
}

.page-content h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: var(--spacing-lg) 0 var(--spacing-md);
  color: var(--color-text-primary);
}

.page-content ul {
  padding-left: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.page-content ul li {
  position: relative;
  padding-left: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-secondary);
}

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

/* ========== 合规提醒条 ========== */
.compliance-notice {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-warning);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
}

.compliance-notice p {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin: 0;
}

.compliance-notice a {
  color: var(--color-primary-light);
  text-decoration: underline;
}

/* ========== 404页面 ========== */
.error-page {
  min-height: 60vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--spacing-2xl);
}

.error-code {
  font-size: clamp(4rem, 15vw, 8rem);
  font-weight: 900;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: var(--spacing-md);
}

.error-message {
  font-size: 1.2rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
}

.error-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  justify-content: center;
}

/* ========== APP下载页 ========== */
.app-hero {
  text-align: center;
  padding: var(--spacing-3xl) 0;
}

.app-mockup {
  max-width: 280px;
  margin: 0 auto var(--spacing-xl);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.app-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
}

.app-feature-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-xl);
  text-align: center;
  transition: all var(--transition-fast);
}

.app-feature-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.app-feature-icon {
  font-size: 2rem;
  margin-bottom: var(--spacing-md);
}

.app-feature-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.app-feature-desc {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

/* ========== 动画 ========== */
@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ========== 桌面端适配 ========== */
@media (min-width: 768px) {
  .nav-main {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    position: static;
    background: none;
    border: none;
    padding: 0;
    flex-direction: row;
  }

  .menu-toggle {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }

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

@media (min-width: 1024px) {
  .masonry-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .container {
    padding: 0 var(--spacing-xl);
  }
}

/* ========== 滚动条 ========== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-dark);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-border-light);
}

/* ========== 视频专区 ========== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.video-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.video-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  background: var(--color-bg-section);
  overflow: hidden;
}

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

.video-duration {
  position: absolute;
  bottom: var(--spacing-sm);
  right: var(--spacing-sm);
  padding: 2px 8px;
  background: rgba(0,0,0,0.85);
  color: #fff;
  font-size: 0.75rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
}

.video-info {
  padding: var(--spacing-md);
}

.video-title {
  font-size: 0.95rem;
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.video-meta {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  display: flex;
  gap: var(--spacing-md);
}

/* ========== 内容策略卡片 ========== */
.info-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
}

.info-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

.info-card p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

/* ========== 联系表单 ========== */
.contact-form {
  max-width: 600px;
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.form-input,
.form-textarea {
  width: 100%;
  padding: var(--spacing-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: 0.95rem;
  font-family: var(--font-main);
  outline: none;
  transition: border-color var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus {
  border-color: var(--color-primary);
}

.form-textarea {
  min-height: 140px;
  resize: vertical;
}

.form-select {
  width: 100%;
  padding: var(--spacing-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: 0.95rem;
  outline: none;
  appearance: none;
}