/* ==========================================================================
   老猫云机场 - 2026 全新排版与视觉规范 (Modern Obsidian & Cyber Violet)
   零外部框架依赖，秒开级极速性能，全面符合 WCAG 2.1 AA 级无障碍对比度规范
   ========================================================================== */

:root {
  /* 字体族定义 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  /* 全新背景色系 (深邃黑曜石与科技夜空) */
  --bg-main: #06080e;
  --bg-secondary: #0b0f19;
  --bg-card: rgba(16, 23, 38, 0.72);
  --bg-card-hover: rgba(24, 34, 56, 0.88);
  --bg-surface: #131c2e;
  --bg-surface-hover: #1a263d;
  --bg-glass: rgba(11, 15, 25, 0.82);

  /* 全新主色调与功能色 (电光紫罗兰、琥珀金、薄荷翠绿) */
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-light: #818cf8;
  --primary-glow: rgba(99, 102, 241, 0.35);
  
  --accent: #f59e0b;
  --accent-hover: #d97706;
  --accent-light: #fbbf24;
  --accent-glow: rgba(245, 158, 11, 0.35);

  --emerald: #10b981;
  --emerald-glow: rgba(16, 185, 129, 0.3);
  --cyan: #06b6d4;

  /* 文字颜色层级 */
  --text-primary: #ffffff;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-subtle: #64748b;

  /* 边框与微光反射层 */
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(99, 102, 241, 0.45);
  --border-active: rgba(245, 158, 11, 0.5);
  --border-shine: inset 0 1px 0 rgba(255, 255, 255, 0.12);

  /* 尺寸与间距布局 */
  --container-max: 1200px;
  --header-height: 74px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  /* 阴影与过渡曲线 */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-card: 0 12px 32px -4px rgba(0, 0, 0, 0.5), 0 4px 12px -2px rgba(0, 0, 0, 0.4);
  --shadow-glow-primary: 0 0 28px -4px var(--primary-glow);
  --shadow-glow-accent: 0 0 28px -4px var(--accent-glow);
  --transition: all 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.65;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-color: var(--bg-main);
  background-image: 
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99, 102, 241, 0.15), transparent 70%),
    radial-gradient(circle at 10% 25%, rgba(245, 158, 11, 0.04), transparent 40%),
    radial-gradient(circle at 90% 75%, rgba(16, 185, 129, 0.04), transparent 40%);
  background-attachment: fixed;
}

/* 键盘无障碍跳过链接 */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1.25rem;
  background: var(--primary);
  color: #fff;
  padding: 0.75rem 1.25rem;
  z-index: 9999;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  box-shadow: var(--shadow-card);
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 1.25rem;
  outline: 3px solid var(--accent);
}

/* 锚点偏移处理（防止被吸顶栏遮挡） */
section, h2, h3, article {
  scroll-margin-top: calc(var(--header-height) + 1.75rem);
}

/* 容器规范 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* 顶部导航栏 (Glassmorphism 磨砂毛玻璃) */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  height: var(--header-height);
  background-color: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  display: flex;
  align-items: center;
  transition: var(--transition);
}

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

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  text-decoration: none;
  color: var(--text-primary);
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  transition: var(--transition);
}

.site-logo:hover {
  opacity: 0.92;
  transform: translateY(-1px);
}

.logo-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--primary) 0%, #8b5cf6 50%, var(--accent) 100%);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
  flex-shrink: 0;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 0.75rem;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  position: relative;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: #ffffff;
  background-color: rgba(255, 255, 255, 0.05);
}

.nav-links a.active {
  color: #ffffff;
  background-color: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.3);
}

/* 按钮通用规范 (满足手机端点击热区 >= 46x46px) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 48px;
  padding: 0.7rem 1.65rem;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition);
  text-align: center;
  white-space: nowrap;
  letter-spacing: -0.01em;
}

.btn:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

/* 主 CTA 按钮 (电光紫罗兰渐变，醒目大气) */
.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, #4f46e5 100%);
  color: #ffffff;
  box-shadow: 0 4px 18px var(--primary-glow), var(--border-shine);
  border-color: rgba(255, 255, 255, 0.15);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #7174f8 0%, #4338ca 100%);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(99, 102, 241, 0.5), var(--border-shine);
}

/* 琥珀金高转化呼吁按钮 (极致吸睛，适合立即注册/限时抢购) */
.btn-accent {
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  color: #ffffff;
  box-shadow: 0 4px 18px var(--accent-glow), var(--border-shine);
  border-color: rgba(255, 255, 255, 0.2);
}

.btn-accent:hover {
  background: linear-gradient(135deg, #fbbf24 0%, #b45309 100%);
  transform: translateY(-2px);
  box-shadow: 0 8px 26px rgba(245, 158, 11, 0.55), var(--border-shine);
}

/* 次级按钮 (玻璃质感半透明) */
.btn-secondary {
  background-color: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
  color: #ffffff;
}

/* 大号 CTA 尺寸 */
.btn-lg {
  min-height: 54px;
  padding: 0.85rem 2.25rem;
  font-size: 1.1rem;
}

/* 主视觉区 (Hero Section) */
.hero-section {
  padding: 5.5rem 0 4.5rem;
  position: relative;
  text-align: center;
  overflow: hidden;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: rgba(99, 102, 241, 0.12);
  color: var(--primary-light);
  border: 1px solid rgba(99, 102, 241, 0.3);
  padding: 0.45rem 1.15rem;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 1.75rem;
  box-shadow: 0 2px 12px rgba(99, 102, 241, 0.15);
}

.hero-badge svg {
  color: var(--accent);
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.035em;
  margin-bottom: 1.5rem;
  color: #ffffff;
}

.hero-title span {
  background: linear-gradient(135deg, #ffffff 30%, #a5b4fc 65%, #fcd34d 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero-intro {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 840px;
  margin: 0 auto 2.5rem;
  line-height: 1.8;
  font-weight: 400;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.hero-guarantee {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.guarantee-item {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.guarantee-item svg {
  color: var(--emerald);
  flex-shrink: 0;
}

/* 区块通用结构 */
.section-padding {
  padding: 5.5rem 0;
  position: relative;
}

.section-alt {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 3.5rem;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--primary-light);
  font-weight: 700;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
  background: rgba(99, 102, 241, 0.1);
  padding: 0.3rem 0.9rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(99, 102, 241, 0.25);
}

.section-title {
  font-size: clamp(1.85rem, 3.8vw, 2.65rem);
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 1rem;
  letter-spacing: -0.025em;
  line-height: 1.25;
}

.section-desc {
  font-size: 1.08rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* 核心优势卡片 (3列图文卡片) */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.feature-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-card), var(--border-shine);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.6), transparent);
  opacity: 0;
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-card), var(--shadow-glow-primary);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon-wrapper {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.2) 0%, rgba(139, 92, 246, 0.1) 100%);
  border: 1px solid rgba(99, 102, 241, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #a5b4fc;
  margin-bottom: 1.75rem;
  box-shadow: 0 4px 16px rgba(99, 102, 241, 0.2);
}

.feature-title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.85rem;
  color: #ffffff;
  letter-spacing: -0.015em;
}

.feature-text {
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.75;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  border-top: 1px solid var(--border-color);
  padding-top: 1.25rem;
}

.feature-list li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.feature-list li svg {
  color: var(--emerald);
  flex-shrink: 0;
}

/* 流媒体与 AI 支持图卡 */
.media-ai-container {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2.25rem;
}

.media-ai-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-card), var(--border-shine);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  transition: var(--transition);
}

.media-ai-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-card), var(--shadow-glow-primary);
}

.card-badge {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-full);
  margin-bottom: 1.15rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.badge-stream {
  background: rgba(239, 68, 68, 0.15);
  color: #fca5a5;
  border: 1px solid rgba(239, 68, 68, 0.35);
}

.badge-ai {
  background: rgba(16, 185, 129, 0.15);
  color: #6ee7b7;
  border: 1px solid rgba(16, 185, 129, 0.35);
}

.media-card-title {
  font-size: 1.4rem;
  color: #ffffff;
  margin-bottom: 0.65rem;
  font-weight: 700;
  letter-spacing: -0.015em;
}

.media-card-desc {
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.7;
}

.media-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-top: 1.75rem;
}

.media-item {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-md);
  padding: 1rem 0.6rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.45rem;
  transition: var(--transition);
}

.media-item:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--primary-light);
  transform: translateY(-3px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
}

.media-name {
  font-size: 0.85rem;
  font-weight: 700;
  color: #f1f5f9;
}

.media-tag {
  font-size: 0.72rem;
  color: var(--emerald);
  font-weight: 500;
}

/* 套餐价格对比表 */
.pricing-table-wrapper {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow-card), var(--border-shine);
  -webkit-overflow-scrolling: touch;
}

.pricing-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 740px;
}

.pricing-table caption {
  padding: 1.5rem 1.75rem;
  font-size: 1.15rem;
  font-weight: 800;
  text-align: left;
  color: #ffffff;
  border-bottom: 1px solid var(--border-color);
  background: rgba(255, 255, 255, 0.02);
  letter-spacing: -0.015em;
}

.pricing-table th,
.pricing-table td {
  padding: 1.35rem 1.75rem;
  border-bottom: 1px solid var(--border-color);
  vertical-align: middle;
}

.pricing-table th {
  background: rgba(11, 15, 25, 0.95);
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.pricing-table tbody tr {
  transition: var(--transition);
}

.pricing-table tbody tr:hover {
  background-color: rgba(99, 102, 241, 0.06);
}

/* 热门推荐行高亮效果 */
.pricing-table tr.highlight-row {
  background: linear-gradient(90deg, rgba(245, 158, 11, 0.1) 0%, rgba(99, 102, 241, 0.08) 100%);
  position: relative;
}

.pricing-table tr.highlight-row td:first-child {
  border-left: 4px solid var(--accent);
}

.plan-name-box {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.plan-name-text {
  font-weight: 800;
  font-size: 1.15rem;
  color: #ffffff;
}

.plan-tag-hot {
  background: linear-gradient(135deg, #f59e0b 0%, #ea580c 100%);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  letter-spacing: 0.02em;
  box-shadow: 0 2px 8px var(--accent-glow);
}

.plan-price-num {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--accent-light);
  letter-spacing: -0.02em;
}

.plan-price-period {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-left: 0.25rem;
}

.pricing-note {
  margin-top: 1.5rem;
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* 用户评价区 */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.review-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-card), var(--border-shine);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
}

.review-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-card), var(--shadow-glow-primary);
}

.review-stars {
  color: var(--accent-light);
  margin-bottom: 1rem;
  display: flex;
  gap: 0.25rem;
  font-size: 1.1rem;
}

.review-text {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.75;
  margin-bottom: 1.75rem;
  font-style: italic;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  border-top: 1px solid var(--border-color);
  padding-top: 1.25rem;
}

.avatar-circle {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1rem;
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.author-info h4 {
  font-size: 1rem;
  font-weight: 700;
  color: #ffffff;
}

.author-info p {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* 常见问题 (FAQ - 默认展开 details/summary) */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  max-width: 880px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-card), var(--border-shine);
  border-radius: var(--radius-md);
  padding: 1.4rem 1.75rem;
  transition: var(--transition);
}

.faq-item:hover {
  border-color: var(--border-hover);
}

.faq-item[open] {
  border-color: rgba(99, 102, 241, 0.4);
  background: rgba(20, 28, 46, 0.85);
}

.faq-item summary {
  font-size: 1.12rem;
  font-weight: 700;
  color: #ffffff;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  outline: none;
  gap: 1rem;
}

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

.faq-item summary::after {
  content: "+";
  font-size: 1.6rem;
  font-weight: 400;
  color: var(--primary-light);
  line-height: 1;
  transition: var(--transition);
}

.faq-item[open] summary::after {
  content: "−";
  color: var(--accent-light);
  transform: rotate(180deg);
}

.faq-answer {
  margin-top: 1.15rem;
  padding-top: 1.15rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.8;
}

.faq-answer a {
  color: var(--primary-light);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.faq-answer a:hover {
  color: var(--accent-light);
}

/* 底部呼吁转化区 (Bottom CTA) */
.bottom-cta-section {
  background: radial-gradient(circle at 50% 50%, rgba(99, 102, 241, 0.22) 0%, rgba(245, 158, 11, 0.08) 45%, transparent 75%);
  border-top: 1px solid var(--border-color);
  text-align: center;
}

.bottom-cta-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  margin-bottom: 1.25rem;
  color: #ffffff;
  letter-spacing: -0.025em;
  line-height: 1.25;
}

.bottom-cta-desc {
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 2.5rem;
  font-size: 1.12rem;
  line-height: 1.75;
}

/* 页脚：严格只保留 4 个标题，并在新页面打开 */
.site-footer {
  margin-top: auto;
  background-color: #040508;
  border-top: 1px solid var(--border-color);
  padding: 3.5rem 0 2.25rem;
  position: relative;
}

.footer-nav-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 2rem;
}

.footer-links-list {
  display: flex;
  align-items: center;
  justify-content: center;
  list-style: none;
  gap: 2.25rem;
  flex-wrap: wrap;
}

.footer-links-list a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 1.05rem;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  border: 1px solid transparent;
}

.footer-links-list a:hover,
.footer-links-list a:focus-visible {
  color: #ffffff;
  background-color: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.1);
}

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 1.75rem;
  color: var(--text-subtle);
  font-size: 0.88rem;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.25rem;
}

/* 面包屑导航 */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 2.25rem;
}

.breadcrumbs a {
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition);
}

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

.breadcrumbs span {
  color: var(--text-subtle);
}

/* 文章页面排版规范 (Article Typography) */
.article-container {
  max-width: 860px;
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
}

.article-header {
  margin-bottom: 3rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 2rem;
}

.article-header h1 {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 1.25rem;
  color: #ffffff;
  letter-spacing: -0.025em;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  flex-wrap: wrap;
}

.article-content {
  color: var(--text-secondary);
  font-size: 1.08rem;
  line-height: 1.85;
}

.article-content h2 {
  font-size: 1.55rem;
  font-weight: 700;
  color: #ffffff;
  margin: 3rem 0 1.25rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid var(--border-color);
  letter-spacing: -0.015em;
}

.article-content h3 {
  font-size: 1.28rem;
  font-weight: 600;
  color: #f1f5f9;
  margin: 2rem 0 0.85rem;
  letter-spacing: -0.01em;
}

.article-content p {
  margin-bottom: 1.65rem;
}

.article-content ul,
.article-content ol {
  margin: 1.35rem 0 1.65rem 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.article-content a {
  color: var(--primary-light);
  text-decoration: underline;
  text-underline-offset: 4px;
  font-weight: 500;
  transition: var(--transition);
}

.article-content a:hover {
  color: var(--accent-light);
}

.sitemap-item-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
  margin-bottom: 0.75rem;
  line-height: 1.6;
}

.article-content blockquote {
  border-left: 4px solid var(--primary);
  background: var(--bg-card);
  padding: 1.25rem 1.5rem;
  margin: 2rem 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: #e2e8f0;
  box-shadow: var(--shadow-sm);
}

.article-cta-box {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.16) 0%, rgba(245, 158, 11, 0.12) 100%);
  border: 1px solid rgba(99, 102, 241, 0.35);
  box-shadow: var(--shadow-card), var(--shadow-glow-primary);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  text-align: center;
  margin: 3.5rem 0;
}

.article-cta-box h2,
.article-cta-box h3 {
  margin-top: 0;
  color: #ffffff;
  font-size: 1.45rem;
  margin-bottom: 0.85rem;
  font-weight: 800;
  letter-spacing: -0.015em;
}

.article-cta-box p {
  color: var(--text-secondary);
  margin-bottom: 1.75rem;
  font-size: 1.05rem;
}

/* 知识库列表卡片 */
.knowledge-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.knowledge-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-card), var(--border-shine);
  border-radius: var(--radius-lg);
  padding: 2.25rem 1.85rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
}

.knowledge-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-card), var(--shadow-glow-primary);
}

.knowledge-meta {
  font-size: 0.82rem;
  color: var(--accent-light);
  margin-bottom: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.knowledge-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 0.85rem;
  line-height: 1.45;
  letter-spacing: -0.015em;
}

.knowledge-title a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

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

.knowledge-card .btn {
  margin-top: 1.25rem;
  width: 100%;
}

.knowledge-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

/* 响应式媒体查询适配 (Mobile Friendly) */
@media (max-width: 1024px) {
  .features-grid,
  .reviews-grid,
  .knowledge-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }
  
  .media-ai-container {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 66px;
  }
  
  .nav-links {
    display: none; /* 移动端导航简化模式 */
  }
  
  .features-grid,
  .reviews-grid,
  .knowledge-grid {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
  
  .media-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
  }
  
  .hero-section {
    padding: 3.5rem 0 2.5rem;
  }
  
  .section-padding {
    padding: 3.5rem 0;
  }
  
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
    gap: 1rem;
  }
  
  .hero-cta-group .btn {
    width: 100%;
  }

  .hero-guarantee {
    gap: 0.75rem;
  }
  
  .footer-links-list {
    flex-direction: column;
    gap: 0.85rem;
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

/* 无障碍：减少动效模式 */
@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;
  }
}