/* ===== 本地热点与区域话题站 - 全局样式 ===== */
:root {
  --color-primary: #e63946;
  --color-primary-dark: #b82e3a;
  --color-secondary: #1d3557;
  --color-accent: #f4a261;
  --color-bg: #0f1923;
  --color-bg-secondary: #162635;
  --color-bg-card: #1a2f42;
  --color-bg-card-hover: #213a50;
  --color-text: #e8e8e8;
  --color-text-muted: #9ab0c4;
  --color-text-light: #ffffff;
  --color-border: #2a4560;
  --color-border-light: #3a5a7a;
  --color-success: #2ecc71;
  --color-warning: #f39c12;
  --color-danger: #e74c3c;
  --color-tag: #264b6e;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.3);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.4);
  --transition: 0.3s 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: 40px;
  --spacing-xxl: 64px;
  --max-width: 1200px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

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

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

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

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

ul, ol {
  list-style: none;
}

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

/* ===== 头部导航 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(15, 25, 35, 0.95);
  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;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.site-logo {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-text-light);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

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

.nav-main {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.nav-main a {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.nav-main a:hover,
.nav-main a.active {
  color: var(--color-text-light);
  background: var(--color-bg-card);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: var(--spacing-sm);
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ===== 移动端菜单 ===== */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }
  .nav-main {
    position: fixed;
    top: 0;
    right: -100%;
    width: 75%;
    max-width: 300px;
    height: 100vh;
    background: var(--color-bg-secondary);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--spacing-xxl) var(--spacing-lg);
    gap: var(--spacing-md);
    transition: right var(--transition);
    box-shadow: var(--shadow-lg);
    z-index: 2000;
  }
  .nav-main.open {
    right: 0;
  }
  .nav-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    z-index: 1500;
  }
  .nav-overlay.show {
    display: block;
  }
}

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

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

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

.breadcrumb .sep {
  margin: 0 var(--spacing-xs);
}

/* ===== 首屏区域 ===== */
.hero {
  padding: var(--spacing-xxl) 0;
  text-align: center;
  background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-bg) 100%);
  border-bottom: 1px solid var(--color-border);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 40%, rgba(230, 57, 70, 0.05) 0%, transparent 50%),
              radial-gradient(circle at 70% 60%, rgba(244, 162, 97, 0.05) 0%, transparent 50%);
  animation: heroGlow 20s ease-in-out infinite;
}

@keyframes heroGlow {
  0%, 100% { transform: rotate(0deg); }
  50% { transform: rotate(180deg); }
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.02em;
}

.hero .subtitle {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  max-width: 680px;
  margin: 0 auto var(--spacing-lg);
  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-lg);
  padding-right: 120px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  color: var(--color-text);
  font-size: 1rem;
  outline: none;
  transition: all var(--transition);
}

.hero-search input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(230, 57, 70, 0.15);
}

.hero-search button {
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  padding: var(--spacing-sm) var(--spacing-lg);
  background: var(--color-primary);
  color: var(--color-text-light);
  border: none;
  border-radius: var(--radius-xl);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition);
}

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

.search-suggestions {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-top: var(--spacing-xs);
  display: none;
  z-index: 100;
  overflow: hidden;
}

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

.search-suggestions a {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border);
  font-size: 0.9rem;
}

.search-suggestions a:hover {
  background: var(--color-bg-card-hover);
}

/* ===== 区块标题 ===== */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

.section-header h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text-light);
  position: relative;
  padding-left: var(--spacing-md);
}

.section-header h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  background: var(--color-primary);
  border-radius: 2px;
}

.section-header .more-link {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* ===== 内容区块 ===== */
.content-section {
  padding: var(--spacing-xl) 0;
}

/* ===== 城市卡片网格 ===== */
.city-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--spacing-lg);
}

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

.city-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

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

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

.city-card .card-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-sm);
}

.city-card .card-desc {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: var(--spacing-sm);
}

.city-card .card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.tag {
  display: inline-block;
  padding: 2px 10px;
  background: var(--color-tag);
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
}

.tag-hot {
  background: rgba(230, 57, 70, 0.2);
  color: var(--color-primary);
}

/* ===== 热榜列表 ===== */
.rank-list {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

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

.rank-item:last-child {
  border-bottom: none;
}

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

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

.rank-num.top-1 { background: var(--color-primary); color: #fff; }
.rank-num.top-2 { background: var(--color-accent); color: #fff; }
.rank-num.top-3 { background: var(--color-warning); color: #fff; }

.rank-title {
  flex: 1;
  font-size: 0.9rem;
  color: var(--color-text);
}

.rank-heat {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  white-space: nowrap;
}

/* ===== 地图占位区域 ===== */
.map-section {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  text-align: center;
  position: relative;
  overflow: hidden;
  min-height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.map-section img {
  width: 100%;
  height: 300px;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

/* ===== 专题卡片 ===== */
.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-lg);
}

.topic-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  transition: all var(--transition);
}

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

.topic-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-sm);
}

.topic-card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--spacing-md);
}

.topic-card .topic-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* ===== 合规提醒 ===== */
.compliance-notice {
  background: linear-gradient(135deg, rgba(230, 57, 70, 0.08), rgba(244, 162, 97, 0.08));
  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 h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-warning);
  margin-bottom: var(--spacing-sm);
}

.compliance-notice p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

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

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

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

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-lg);
  cursor: pointer;
  font-weight: 600;
  color: var(--color-text-light);
  transition: background var(--transition);
}

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

.faq-question .faq-icon {
  font-size: 1.2rem;
  transition: transform var(--transition);
}

.faq-item.open .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 var(--spacing-lg);
  max-height: 0;
  overflow: hidden;
  transition: all var(--transition);
}

.faq-item.open .faq-answer {
  padding: var(--spacing-md) var(--spacing-lg);
  max-height: 500px;
}

.faq-answer p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.8;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-text-light);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  color: var(--color-text-light);
}

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

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

.btn-accent {
  background: var(--color-accent);
  color: var(--color-secondary);
}

.btn-accent:hover {
  background: #e8944f;
  color: var(--color-secondary);
}

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

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-col h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-md);
}

.footer-col a {
  display: block;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  padding: var(--spacing-xs) 0;
  transition: color var(--transition);
}

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

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.footer-bottom .footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-md);
  margin-top: var(--spacing-sm);
}

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

/* ===== 返回顶部 ===== */
.back-to-top {
  position: fixed;
  bottom: 80px;
  right: 20px;
  width: 44px;
  height: 44px;
  background: var(--color-primary);
  color: var(--color-text-light);
  border: none;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
  box-shadow: var(--shadow-md);
  z-index: 900;
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
}

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

/* ===== PWA安装提示 ===== */
.pwa-prompt {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--color-bg-card);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-md) var(--spacing-lg);
  display: none;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  z-index: 1100;
  box-shadow: var(--shadow-lg);
}

.pwa-prompt.show {
  display: flex;
}

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

.pwa-prompt .pwa-actions {
  display: flex;
  gap: var(--spacing-sm);
}

/* ===== 表单提示 ===== */
.toast {
  position: fixed;
  top: 80px;
  right: 20px;
  background: var(--color-success);
  color: #fff;
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 500;
  opacity: 0;
  transform: translateX(100%);
  transition: all var(--transition);
  z-index: 2000;
}

.toast.show {
  opacity: 1;
  transform: translateX(0);
}

/* ===== 榜单切换 ===== */
.tab-nav {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
}

.tab-btn {
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all var(--transition);
}

.tab-btn.active,
.tab-btn:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-text-light);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

/* ===== 搜索结果 ===== */
.search-results {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

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

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

.search-result-item h3 {
  font-size: 1rem;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-sm);
}

.search-result-item p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.search-result-item .result-path {
  font-size: 0.75rem;
  color: var(--color-accent);
  margin-top: var(--spacing-sm);
}

/* ===== 内页通用 ===== */
.page-hero {
  padding: var(--spacing-xl) 0;
  background: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
}

.page-hero h1 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-sm);
}

.page-hero .page-desc {
  font-size: 1rem;
  color: var(--color-text-muted);
  max-width: 700px;
  line-height: 1.7;
}

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

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

.page-content h2 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-text-light);
  margin: var(--spacing-xl) 0 var(--spacing-md);
  padding-left: var(--spacing-md);
  border-left: 4px solid var(--color-primary);
}

.page-content h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-light);
  margin: var(--spacing-lg) 0 var(--spacing-sm);
}

/* ===== 内链模块 ===== */
.related-links {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
}

.related-links h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-md);
}

.related-links ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--spacing-sm);
}

.related-links li a {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--color-text-muted);
  transition: all var(--transition);
}

.related-links li a:hover {
  background: var(--color-bg-card-hover);
  color: var(--color-accent);
}

/* ===== 404页面 ===== */
.error-page {
  text-align: center;
  padding: var(--spacing-xxl) var(--spacing-md);
}

.error-page h1 {
  font-size: 6rem;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.error-page p {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-xl);
}

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

/* ===== 表单 ===== */
.form-group {
  margin-bottom: var(--spacing-md);
}

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

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 0.9rem;
  font-family: var(--font-main);
  outline: none;
  transition: border-color var(--transition);
}

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

.form-group textarea {
  min-height: 120px;
  resize: vertical;
}

/* ===== 时间线 ===== */
.timeline {
  position: relative;
  padding-left: var(--spacing-xl);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--spacing-xl) + 8px);
  top: var(--spacing-lg);
  width: 10px;
  height: 10px;
  background: var(--color-primary);
  border-radius: 50%;
}

.timeline-item .timeline-date {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-xs);
}

.timeline-item h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-xs);
}

.timeline-item p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ===== 下载页 ===== */
.download-hero {
  text-align: center;
  padding: var(--spacing-xxl) 0;
}

.download-hero .app-icon {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-lg);
  margin: 0 auto var(--spacing-lg);
}

.download-buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-md);
  margin: var(--spacing-lg) 0;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--spacing-lg);
}

.feature-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  text-align: center;
}

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

.feature-item h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-sm);
}

.feature-item p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ===== 两栏布局 ===== */
.two-col {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--spacing-xl);
}

@media (max-width: 768px) {
  .two-col {
    grid-template-columns: 1fr;
  }
}

/* ===== 侧边栏 ===== */
.sidebar-widget {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.sidebar-widget h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--color-border);
}

.sidebar-widget ul li {
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--color-border);
}

.sidebar-widget ul li:last-child {
  border-bottom: none;
}

.sidebar-widget ul li a {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.sidebar-widget ul li a:hover {
  color: var(--color-accent);
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 1.6rem;
  }
  .hero .subtitle {
    font-size: 0.95rem;
  }
  .section-header h2 {
    font-size: 1.2rem;
  }
  .city-grid {
    grid-template-columns: 1fr;
  }
  .topic-grid {
    grid-template-columns: 1fr;
  }
  .feature-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-hero h1 {
    font-size: 1.5rem;
  }
  .download-buttons {
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .tab-nav {
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: var(--spacing-sm);
  }
}

/* ===== 动画 ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-in {
  animation: fadeInUp 0.5s ease forwards;
}

/* ===== 统计数字 ===== */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--spacing-md);
  margin: var(--spacing-lg) 0;
}

.stat-item {
  text-align: center;
  padding: var(--spacing-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.stat-item .stat-num {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--color-primary);
}

.stat-item .stat-label {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: var(--spacing-xs);
}

/* ===== 区域标签云 ===== */
.region-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin: var(--spacing-md) 0;
}

.region-tag {
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  font-size: 0.85rem;
  color: var(--color-text-muted);
  transition: all var(--transition);
}

.region-tag:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(230, 57, 70, 0.1);
}

/* ===== 步骤列表 ===== */
.steps-list {
  counter-reset: step;
}

.step-item {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-lg);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.step-item::before {
  counter-increment: step;
  content: counter(step);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50%;
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.step-content h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-xs);
}

.step-content p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}