/* ==========================================================================
   MESL机场官网 - 全局原生 CSS 样式表 (style.css)
   极简无依赖、纯原生 CSS、支持响应式、无障碍与秒开加载
   主题风格：梦幻紫 (Dreamy Cosmic Purple)
   ========================================================================== */

:root {
  /* 梦幻紫主背景与层级色调 (优雅通透，光感适中) */
  --bg-primary: #080412;
  --bg-secondary: rgba(18, 12, 32, 0.84);
  --bg-card: rgba(24, 16, 42, 0.86);
  --bg-card-hover: rgba(33, 22, 58, 0.92);
  --bg-muted: rgba(40, 27, 70, 0.86);
  
  --text-main: #fbf8ff;
  --text-secondary: #cbd5e1;
  --text-muted: #9f96bf;
  
  /* 梦幻紫核心高亮与点缀霓虹色 */
  --primary: #9333ea;
  --primary-hover: #a855f7;
  --primary-glow: rgba(147, 51, 234, 0.32);
  --accent: #e879f9;
  --accent-glow: rgba(232, 121, 249, 0.22);
  --success: #10b981;
  --warning: #f59e0b;
  
  --border-color: rgba(168, 85, 247, 0.16);
  --border-focus: #c084fc;
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  --container-max: 1200px;
  --header-height: 72px;
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 10px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px var(--primary-glow);
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  background-image: linear-gradient(rgba(8, 4, 16, 0.18), rgba(6, 3, 12, 0.32)), url('bg-blackhole.svg');
  background-repeat: no-repeat;
  background-position: center top;
  background-size: 1920px auto;
  background-attachment: fixed;
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* 无障碍跳转至主内容 */
.skip-link {
  position: absolute;
  top: -60px;
  left: 20px;
  background: var(--primary);
  color: #ffffff;
  padding: 12px 20px;
  z-index: 9999;
  border-radius: var(--radius-sm);
  font-weight: 600;
  text-decoration: none;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 20px;
  outline: 3px solid #ffffff;
}

/* 锚点偏移量处理 */
section, h1, h2, h3 {
  scroll-margin-top: calc(var(--header-height) + 20px);
}

/* 容器 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* 排版与标题 */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-main);
  font-weight: 700;
  line-height: 1.25;
}

h1 {
  font-size: 2.5rem;
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
}

h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
  text-align: center;
}

h3 {
  font-size: 1.35rem;
  margin-bottom: 0.75rem;
}

p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

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

a:hover {
  color: #f0abfc;
}

a:focus-visible, button:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 4px;
}

img, svg {
  vertical-align: middle;
  max-width: 100%;
  height: auto;
}

/* 顶部导航栏 */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: rgba(6, 3, 10, 0.94);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  display: flex;
  align-items: center;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.01em;
}

.brand-logo svg {
  width: 32px;
  height: 32px;
  color: var(--accent);
}

.brand-logo:hover {
  color: #ffffff;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 8px 4px;
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-main);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transition: width var(--transition-fast);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

/* 按钮通用组件 (触摸区域至少44x44px) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  min-width: 44px;
  padding: 10px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #9333ea 0%, #7c3aed 50%, #6366f1 100%);
  color: #ffffff;
  box-shadow: 0 4px 16px rgba(147, 51, 234, 0.4);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #a855f7 0%, #8b5cf6 50%, #7c3aed 100%);
  color: #ffffff;
  box-shadow: 0 6px 24px rgba(168, 85, 247, 0.55);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--text-main);
  border-color: rgba(168, 85, 247, 0.35);
}

.btn-outline:hover {
  background: rgba(147, 51, 234, 0.12);
  border-color: var(--accent);
  color: #ffffff;
}

.btn-sm {
  min-height: 38px;
  padding: 8px 16px;
  font-size: 0.875rem;
}

.btn-lg {
  min-height: 48px;
  padding: 14px 32px;
  font-size: 1.05rem;
}

/* 主视觉区 (Hero Section) */
.hero-section {
  padding: 80px 0 60px;
  position: relative;
  overflow: hidden;
  text-align: center;
}

.hero-bg-glow {
  position: absolute;
  top: -15%;
  left: 50%;
  transform: translateX(-50%);
  width: 720px;
  height: 460px;
  background: radial-gradient(circle, rgba(147, 51, 234, 0.20) 0%, rgba(217, 70, 239, 0.10) 40%, rgba(99, 102, 241, 0.04) 65%, transparent 75%);
  filter: blur(75px);
  pointer-events: none;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 860px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(147, 51, 234, 0.15);
  border: 1px solid rgba(168, 85, 247, 0.35);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  color: var(--accent);
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 24px;
  box-shadow: 0 0 15px rgba(147, 51, 234, 0.2);
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  padding-top: 30px;
  border-top: 1px solid var(--border-color);
}

.stat-item {
  text-align: center;
}

.stat-num {
  font-size: 1.75rem;
  font-weight: 800;
  color: #ffffff;
  display: block;
  text-shadow: 0 0 12px rgba(168, 85, 247, 0.35);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* 区块通用结构 */
.section-block {
  padding: 80px 0;
  position: relative;
}

.section-block-alt {
  background-color: var(--bg-secondary);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 50px;
}

.section-tag {
  display: inline-block;
  color: var(--accent);
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 10px;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
}

/* 核心优势卡片 (3列图文卡片) */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background-color: var(--bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(217, 70, 239, 0.45);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.5), var(--shadow-glow);
}

.feature-icon-wrapper {
  width: 56px;
  height: 56px;
  background: rgba(147, 51, 234, 0.16);
  border: 1px solid rgba(168, 85, 247, 0.32);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  color: var(--accent);
  box-shadow: 0 0 16px rgba(147, 51, 234, 0.25);
}

.feature-icon-wrapper svg {
  width: 28px;
  height: 28px;
}

.feature-card h3 {
  color: #ffffff;
  font-size: 1.25rem;
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.65;
  margin-bottom: 16px;
  flex-grow: 1;
}

.feature-list {
  list-style: none;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.feature-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}

.feature-list li::before {
  content: '✓';
  color: var(--success);
  font-weight: 700;
}

/* 流媒体与 AI 支持图卡展示 */
.media-ai-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.media-ai-card {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px;
}

.media-ai-card:hover {
  border-color: rgba(168, 85, 247, 0.35);
  box-shadow: var(--shadow-md);
}

.media-ai-card h3 {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  font-size: 1.35rem;
}

.media-tags-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 14px;
  margin-top: 24px;
}

.media-tag-item {
  background: rgba(147, 51, 234, 0.08);
  border: 1px solid rgba(168, 85, 247, 0.18);
  border-radius: var(--radius-sm);
  padding: 12px;
  text-align: center;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
  transition: all var(--transition-fast);
}

.media-tag-item:hover {
  background: rgba(147, 51, 234, 0.22);
  border-color: var(--accent);
  color: #ffffff;
  box-shadow: 0 0 12px rgba(217, 70, 239, 0.25);
}

/* 价格对比表 */
.pricing-table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 10px;
  box-shadow: var(--shadow-md);
  margin-bottom: 24px;
}

.pricing-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 640px;
}

.pricing-table caption {
  font-size: 1.1rem;
  font-weight: 700;
  color: #ffffff;
  padding: 16px 20px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
  caption-side: top;
}

.pricing-table th,
.pricing-table td {
  padding: 18px 20px;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.95rem;
}

.pricing-table th {
  background-color: rgba(147, 51, 234, 0.06);
  color: var(--text-main);
  font-weight: 600;
}

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

.pricing-table tr:hover td {
  background-color: rgba(147, 51, 234, 0.08);
}

.plan-name {
  font-weight: 700;
  color: #ffffff;
  font-size: 1.05rem;
}

.plan-badge {
  display: inline-block;
  background: rgba(16, 185, 129, 0.2);
  color: var(--success);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  margin-left: 6px;
}

.price-val {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--accent);
}

.pricing-note {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
}

/* 客户评价 */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
}

.review-card:hover {
  border-color: rgba(168, 85, 247, 0.35);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.4);
}

.review-stars {
  color: #f59e0b;
  font-size: 1rem;
  margin-bottom: 14px;
  letter-spacing: 2px;
}

.review-card p {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-secondary);
  flex-grow: 1;
}

.reviewer-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
}

.reviewer-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: rgba(147, 51, 234, 0.2);
  border: 1px solid var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #ffffff;
  font-size: 1rem;
}

.reviewer-name {
  font-size: 0.95rem;
  font-weight: 600;
  color: #ffffff;
}

.reviewer-role {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* 常见问题解答 (FAQ) - 原生 details/summary 默认展开 */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.faq-item {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0;
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item[open] {
  border-color: rgba(168, 85, 247, 0.45);
}

.faq-question {
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 600;
  color: #ffffff;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

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

.faq-question::after {
  content: '+';
  font-size: 1.4rem;
  color: var(--accent);
  font-weight: 400;
  transition: transform var(--transition-fast);
}

.faq-item[open] .faq-question::after {
  content: '−';
}

.faq-answer {
  padding: 0 24px 22px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-answer a {
  text-decoration: underline;
  font-weight: 500;
  color: var(--accent);
}

/* 底部页脚 (严格只保留四个标题链接) */
.site-footer {
  margin-top: auto;
  background-color: #020105;
  border-top: 1px solid var(--border-color);
  padding: 50px 0 30px;
}

.footer-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 40px;
  list-style: none;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.footer-nav a {
  color: var(--text-secondary);
  font-size: 1rem;
  font-weight: 500;
  padding: 8px 12px;
  transition: color var(--transition-fast);
}

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

.footer-copyright {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* 独立内容页通用排版 (知识科普、文章、关于、条款等) */
.page-container {
  padding: 60px 0 80px;
}

.article-header {
  max-width: 820px;
  margin: 0 auto 40px;
  text-align: left;
}

.article-meta {
  display: flex;
  gap: 16px;
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.article-meta span {
  display: flex;
  align-items: center;
  gap: 6px;
}

.article-body {
  max-width: 820px;
  margin: 0 auto;
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-md);
}

.article-body h2 {
  text-align: left;
  font-size: 1.5rem;
  margin-top: 32px;
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
  color: #ffffff;
}

.article-body h3 {
  font-size: 1.2rem;
  margin-top: 24px;
  margin-bottom: 10px;
  color: #f5f3ff;
}

.article-body p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 1.25rem;
}

.article-body ul, .article-body ol {
  color: var(--text-secondary);
  padding-left: 24px;
  margin-bottom: 1.5rem;
  line-height: 1.75;
}

.article-body li {
  margin-bottom: 8px;
}

.article-body strong {
  color: #ffffff;
}

.article-body blockquote {
  border-left: 4px solid var(--primary);
  background: rgba(147, 51, 234, 0.1);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
  font-style: normal;
  color: #e2e8f0;
}

.article-cta-box {
  background: linear-gradient(135deg, rgba(147, 51, 234, 0.18) 0%, rgba(217, 70, 239, 0.12) 100%);
  border: 1px solid rgba(168, 85, 247, 0.32);
  border-radius: var(--radius-md);
  padding: 28px;
  text-align: center;
  margin: 36px 0;
}

.article-cta-box h3 {
  color: #ffffff;
  margin-bottom: 10px;
}

.article-cta-box p {
  color: var(--text-secondary);
  margin-bottom: 20px;
}

/* 知识科普列表页卡片 */
.articles-catalog {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-top: 36px;
}

.article-item-card {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

.article-item-card:hover {
  transform: translateY(-4px);
  border-color: rgba(217, 70, 239, 0.45);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.4), 0 0 20px rgba(147, 51, 234, 0.25);
}

.article-card-tag {
  display: inline-block;
  background: rgba(147, 51, 234, 0.18);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  margin-bottom: 14px;
  align-self: flex-start;
}

.article-item-card h2 {
  text-align: left;
  font-size: 1.15rem;
  margin-bottom: 12px;
  line-height: 1.4;
}

.article-item-card h2 a {
  color: #ffffff;
}

.article-item-card h2 a:hover {
  color: var(--accent);
}

.article-item-card p {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text-secondary);
  flex-grow: 1;
  margin-bottom: 18px;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.825rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
  padding-top: 14px;
}

/* 网站地图列表卡片 */
.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-top: 32px;
}

.sitemap-card {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.sitemap-card h2 {
  text-align: left;
  font-size: 1.25rem;
  color: #ffffff;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.sitemap-list {
  list-style: none;
}

.sitemap-list li {
  margin-bottom: 12px;
}

.sitemap-list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-secondary);
  font-size: 0.95rem;
  padding: 6px 0;
}

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

.sitemap-url-badge {
  font-size: 0.75rem;
  color: var(--text-muted);
  background: rgba(147, 51, 234, 0.12);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

/* ==========================================================================
   响应式媒体查询 (Media Queries)
   测试宽度: 1440px, 768px, 390px, 360px
   ========================================================================== */

/* 平板与小屏幕桌面 (<= 1024px) */
@media (max-width: 1024px) {
  .features-grid,
  .articles-catalog {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 移动端横屏与平板竖屏 (<= 768px) */
@media (max-width: 768px) {
  body {
    background-size: 1000px auto;
    background-position: center 0px;
    background-attachment: scroll;
  }
  
  :root {
    --header-height: 64px;
  }
  
  h1 {
    font-size: 1.85rem;
  }
  
  h2 {
    font-size: 1.5rem;
  }
  
  .section-block {
    padding: 50px 0;
  }
  
  .hero-section {
    padding: 50px 0 40px;
  }
  
  .hero-subtitle {
    font-size: 1.05rem;
  }
  
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  
  .main-nav {
    gap: 12px;
  }
  
  .nav-links {
    display: none;
  }
  
  .nav-mobile-link {
    display: inline-flex !important;
  }
  
  .features-grid,
  .articles-catalog,
  .reviews-grid,
  .media-ai-container,
  .sitemap-grid {
    grid-template-columns: 1fr;
  }
  
  .article-body {
    padding: 24px;
  }
  
  .footer-nav {
    flex-direction: column;
    gap: 16px;
  }
}

/* 手机端精细适配 (<= 480px / 390px / 360px) */
@media (max-width: 480px) {
  body {
    background-size: 720px auto;
    background-position: center 25px;
  }
  
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }
  
  h1 {
    font-size: 1.6rem;
  }
  
  .hero-cta {
    flex-direction: column;
    width: 100%;
  }
  
  .hero-cta .btn {
    width: 100%;
  }
  
  .media-tags-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .faq-question {
    padding: 16px 18px;
    font-size: 0.95rem;
  }
  
  .faq-answer {
    padding: 0 18px 18px;
    font-size: 0.9rem;
  }
  
  .btn-lg {
    width: 100%;
  }
  
  .brand-logo {
    font-size: 1.15rem;
  }
}

/* 打印与减弱动画规范 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}