/* ==========================================================================
   龙猫云 (longmaoyun.link) - 官方独享原生样式表 (Cyber-Tech 2.0 极致科技版)
   极简秒开架构：无外部字体、无冗余JS组件库、高可访问性与全响应式适配
   独有风格：深邃极夜黑底、赛博光晕矩阵、实时专线监控 HUD 看板与高转化排版
   ========================================================================== */

:root {
  /* 专属深邃赛博极夜色系 */
  --bg-primary: #040711;
  --bg-secondary: #080d1c;
  --bg-card: rgba(10, 16, 32, 0.82);
  --bg-card-hover: rgba(15, 25, 48, 0.94);
  --border-color: rgba(99, 102, 241, 0.18);
  --border-accent: rgba(0, 240, 255, 0.45);
  --border-glow: rgba(0, 240, 255, 0.25);

  /* 文字层级（确保高对比度 >= 4.5:1） */
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-light: #cbd5e1;
  --text-dim: #64748b;

  /* 赛博高能色彩体系：电光青、高能钴蓝、量子靛紫、状态极光绿 */
  --color-primary: #00f0ff;
  --color-secondary: #3b82f6;
  --color-accent: #8b5cf6;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-tag: rgba(0, 240, 255, 0.12);

  /* 渐变与按钮高光 */
  --color-gradient: linear-gradient(135deg, #00f0ff 0%, #3b82f6 52%, #8b5cf6 100%);
  --color-btn-hover: linear-gradient(135deg, #38bdf8 0%, #60a5fa 50%, #a78bfa 100%);
  --color-surface-gradient: linear-gradient(180deg, rgba(255, 255, 255, 0.05) 0%, rgba(255, 255, 255, 0) 100%);

  /* 阴影与微光 */
  --shadow-sm: 0 4px 14px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 12px 32px -6px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 26px rgba(0, 240, 255, 0.22);
  --shadow-glow-intense: 0 0 35px rgba(0, 240, 255, 0.38);

  /* 圆角规范 */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;

  /* 版心与导航尺寸 */
  --container-width: 1200px;
  --header-height: 74px;
}

/* 基础重置与全局字体设定 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.68;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 18px);
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-color: var(--bg-primary);
  background-image: 
    linear-gradient(rgba(0, 240, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 240, 255, 0.025) 1px, transparent 1px),
    radial-gradient(circle at 85% 10%, rgba(0, 240, 255, 0.14) 0%, transparent 48%),
    radial-gradient(circle at 15% 40%, rgba(139, 92, 246, 0.12) 0%, transparent 44%),
    radial-gradient(circle at 80% 85%, rgba(16, 185, 129, 0.08) 0%, transparent 45%);
  background-size: 44px 44px, 44px 44px, 100% 100%, 100% 100%, 100% 100%;
}

/* 键盘无障碍跳过导航 */
.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  background: var(--color-primary);
  color: #040812;
  padding: 10px 20px;
  z-index: 9999;
  border-radius: var(--radius-sm);
  font-weight: 700;
  text-decoration: none;
  transition: top 0.2s;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.5);
}

.skip-link:focus {
  top: 16px;
  outline: 3px solid #ffffff;
}

/* 容器与版心 */
.container {
  width: min(var(--container-width), calc(100% - 36px));
  margin-inline: auto;
}

/* 顶部导航栏 (赛博微晶毛玻璃) */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(4, 7, 17, 0.88);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  transition: background-color 0.2s, border-color 0.2s;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-main);
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: 0.8px;
}

.brand-logo-img {
  width: 38px;
  height: 38px;
  display: block;
  object-fit: contain;
  filter: drop-shadow(0 0 10px rgba(0, 240, 255, 0.45));
  transition: transform 0.22s cubic-bezier(0.16, 1, 0.3, 1), filter 0.22s ease;
  flex-shrink: 0;
}

.brand-logo:hover .brand-logo-img {
  transform: scale(1.08) translateY(-1px);
  filter: drop-shadow(0 0 16px rgba(0, 240, 255, 0.7));
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 22px;
}

.main-nav a {
  color: var(--text-light);
  text-decoration: none;
  font-size: 0.96rem;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: color 0.2s, background-color 0.2s;
}

.main-nav a:hover, .main-nav a:focus-visible {
  color: var(--color-primary);
  background-color: rgba(0, 240, 255, 0.08);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  background: var(--color-gradient);
  color: #040711 !important;
  font-weight: 800 !important;
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 18px rgba(0, 240, 255, 0.4);
  transition: transform 0.2s, box-shadow 0.2s;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.nav-cta:hover {
  transform: translateY(-1.5px);
  box-shadow: 0 6px 24px rgba(0, 240, 255, 0.6);
}

/* ==========================================================================
   新一代双栏科技主视觉区 (Hero Section)
   ========================================================================== */
.hero-section {
  padding: 80px 0 65px;
  position: relative;
}

.hero-container {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 44px;
  align-items: center;
}

.hero-content {
  text-align: left;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 18px;
  background: var(--color-tag);
  border: 1px solid var(--border-accent);
  color: var(--color-primary);
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 24px;
  box-shadow: 0 0 16px rgba(0, 240, 255, 0.25);
}

.live-dot {
  width: 8px;
  height: 8px;
  background-color: var(--color-primary);
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 10px var(--color-primary);
}

.hero-title {
  font-size: clamp(2.3rem, 4.4vw, 3.6rem);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.6px;
  margin-bottom: 20px;
  background: linear-gradient(180deg, #ffffff 45%, #93c5fd 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: 18px;
  letter-spacing: 0.3px;
}

.hero-desc {
  color: var(--text-muted);
  font-size: 1.05rem;
  line-height: 1.8;
  margin-bottom: 34px;
}

.cta-group {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

/* 按钮通用规范 (满足 >= 44x44px 触控标准) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 32px;
  font-size: 1.02rem;
  font-weight: 800;
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
  border: none;
}

.btn-primary {
  background: var(--color-gradient);
  color: #040711;
  box-shadow: 0 6px 22px rgba(0, 240, 255, 0.35), 0 0 0 1px rgba(255, 255, 255, 0.2) inset;
}

.btn-primary:hover {
  background: var(--color-btn-hover);
  transform: translateY(-2.5px);
  box-shadow: 0 10px 32px rgba(0, 240, 255, 0.55), 0 0 20px rgba(139, 92, 246, 0.4);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
}

/* 信任指标徽章 */
.trust-badges {
  display: flex;
  align-items: center;
  gap: 22px;
  flex-wrap: wrap;
}

.trust-item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.trust-item span:first-child {
  color: var(--color-primary);
  font-weight: 800;
}

/* ==========================================================================
   赛博专线监控 HUD 看板组件 (Hero-HUD-Card)
   ========================================================================== */
.hero-hud-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 30px 26px;
  box-shadow: var(--shadow-md), 0 0 30px rgba(0, 240, 255, 0.12);
  position: relative;
  overflow: hidden;
}

.hero-hud-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-gradient);
}

.hud-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 22px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-color);
}

.hud-status {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.84rem;
  color: var(--color-success);
  font-weight: 700;
  letter-spacing: 0.5px;
}

.pulse-indicator {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--color-success);
  box-shadow: 0 0 10px var(--color-success);
}

.hud-tag {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.76rem;
  padding: 3px 8px;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: var(--color-success);
  border-radius: 4px;
  font-weight: 700;
}

.hud-metrics-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-bottom: 24px;
}

.hud-metric-item {
  background: rgba(4, 7, 17, 0.65);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

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

.metric-value {
  font-size: 1.35rem;
  font-weight: 800;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  line-height: 1.1;
}

.metric-value small {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
}

.tech-cyan { color: var(--color-primary); }
.tech-blue { color: var(--color-secondary); }
.tech-green { color: var(--color-success); }
.tech-purple { color: var(--color-accent); }

.hud-routes-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.hud-route-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 6px;
  padding: 8px 12px;
  font-size: 0.84rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.hud-route-row:hover {
  background: rgba(0, 240, 255, 0.05);
  border-color: rgba(0, 240, 255, 0.2);
}

.route-status { font-size: 0.7rem; }
.route-name { color: var(--text-main); font-weight: 600; }
.route-feat { color: var(--text-muted); font-size: 0.76rem; }
.route-ping { color: var(--color-primary); font-weight: 700; }

/* ==========================================================================
   核心特性卡片 (Features Section)
   ========================================================================== */
.section {
  padding: 76px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 52px;
}

.section-tag {
  color: var(--color-primary);
  font-size: 0.9rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.9rem, 3.6vw, 2.6rem);
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.4px;
}

.section-desc {
  color: var(--text-muted);
  font-size: 1.05rem;
  line-height: 1.75;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 38px 28px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: transparent;
  transition: background 0.3s ease;
}

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

.feature-card:hover::before {
  background: var(--color-gradient);
}

.card-icon {
  width: 58px;
  height: 58px;
  border-radius: 14px;
  background: rgba(0, 240, 255, 0.12);
  border: 1px solid var(--border-accent);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.65rem;
  margin-bottom: 24px;
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.22);
}

.feature-card h3 {
  font-size: 1.32rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text-main);
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.98rem;
  line-height: 1.75;
}

/* ==========================================================================
   流媒体与 AI 支持图卡 (Media & AI)
   ========================================================================== */
.media-ai-container {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  margin-top: 28px;
}

.media-ai-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 40px 34px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.25s, transform 0.25s, box-shadow 0.25s;
}

.media-ai-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.media-ai-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-gradient);
}

.media-ai-card h3 {
  font-size: 1.45rem;
  margin-bottom: 14px;
  color: #ffffff;
}

.media-ai-card p {
  color: var(--text-muted);
  margin-bottom: 24px;
  font-size: 1rem;
  line-height: 1.7;
}

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

.service-tag {
  padding: 8px 16px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  font-size: 0.9rem;
  color: var(--text-light);
  font-weight: 600;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.service-tag:hover {
  background: rgba(0, 240, 255, 0.14);
  border-color: var(--border-accent);
  color: var(--color-primary);
}

/* ==========================================================================
   价格对比表 (Pricing Section)
   ========================================================================== */
.pricing-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow-md);
  margin-top: 32px;
}

.pricing-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 720px;
}

.pricing-table caption {
  caption-side: top;
  text-align: left;
  padding: 18px 28px;
  font-size: 0.92rem;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-color);
  background: rgba(8, 13, 28, 0.7);
}

.pricing-table th, .pricing-table td {
  padding: 22px 28px;
  border-bottom: 1px solid var(--border-color);
}

.pricing-table thead th {
  background: rgba(8, 13, 28, 0.95);
  color: var(--text-main);
  font-weight: 700;
  font-size: 1.05rem;
}

.pricing-table tbody tr {
  transition: background-color 0.2s;
}

.pricing-table tbody tr:hover {
  background: rgba(0, 240, 255, 0.04);
}

.pricing-table .plan-name {
  font-weight: 800;
  color: #ffffff;
  display: block;
  font-size: 1.1rem;
}

.pricing-table .plan-badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 0.76rem;
  font-weight: 700;
  background: var(--color-tag);
  color: var(--color-primary);
  border: 1px solid var(--border-accent);
  margin-top: 5px;
}

.pricing-table .price {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: -0.5px;
}

.pricing-table .period {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.pricing-table .btn-primary {
  min-height: 44px;
  padding: 0 24px;
  font-size: 0.96rem;
  font-weight: 800;
  white-space: nowrap;
  background: var(--color-gradient);
  color: #040711;
  box-shadow: 0 4px 18px rgba(0, 240, 255, 0.45), 0 0 0 1px rgba(255, 255, 255, 0.25) inset;
}

.pricing-table .btn-primary:hover {
  background: var(--color-btn-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 26px rgba(0, 240, 255, 0.7), 0 0 22px rgba(139, 92, 246, 0.5);
}

/* ==========================================================================
   真实用户好评 (Reviews Grid)
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.review-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.22s, border-color 0.22s;
}

.review-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-accent);
}

.review-stars {
  color: #f59e0b;
  margin-bottom: 14px;
  font-size: 1.2rem;
  letter-spacing: 2px;
}

.review-text {
  font-size: 0.98rem;
  color: var(--text-light);
  margin-bottom: 20px;
  line-height: 1.75;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 14px;
}

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(0, 240, 255, 0.16);
  border: 1px solid var(--border-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: var(--color-primary);
  font-size: 1.1rem;
}

.author-info strong {
  display: block;
  font-size: 0.94rem;
  color: var(--text-main);
}

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

/* ==========================================================================
   FAQ 常见问题模块 (默认全部展开 details open)
   ========================================================================== */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 18px;
  max-width: 920px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.25s, box-shadow 0.25s;
}

.faq-item[open] {
  border-color: var(--border-accent);
  border-left: 3px solid var(--color-primary);
  box-shadow: 0 4px 20px rgba(0, 240, 255, 0.14);
}

.faq-item summary {
  padding: 22px 28px;
  font-weight: 700;
  font-size: 1.08rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.02);
  transition: color 0.2s, background-color 0.2s;
}

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

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

.faq-item summary::after {
  content: "▾";
  font-size: 1.35rem;
  color: var(--color-primary);
  transition: transform 0.25s ease;
}

.faq-item[open] summary::after {
  transform: rotate(180deg);
}

.faq-content {
  padding: 20px 28px 28px;
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.8;
  border-top: 1px solid var(--border-color);
  background: rgba(4, 7, 17, 0.4);
}

.faq-content a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* ==========================================================================
   页脚 Footer
   ========================================================================== */
.site-footer {
  margin-top: auto;
  background: #03050c;
  border-top: 1px solid var(--border-color);
  padding: 54px 0 36px;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  flex-wrap: wrap;
  margin-bottom: 26px;
}

.footer-nav a {
  color: var(--text-light);
  text-decoration: none;
  font-size: 0.96rem;
  font-weight: 500;
  transition: color 0.2s;
}

.footer-nav a:hover, .footer-nav a:focus-visible {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.footer-copy {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.88rem;
}

/* ==========================================================================
   文章详情页与独立页面专用样式
   ========================================================================== */
.article-header {
  padding: 54px 0 26px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 38px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 18px;
}

.breadcrumb a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

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

.article-title {
  font-size: clamp(1.85rem, 3.8vw, 2.6rem);
  font-weight: 800;
  line-height: 1.32;
  margin-bottom: 16px;
  color: #ffffff;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.article-body {
  max-width: 860px;
  margin: 0 auto;
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text-light);
}

.article-body p {
  margin-bottom: 22px;
}

.article-body h2 {
  font-size: 1.55rem;
  font-weight: 700;
  color: #ffffff;
  margin: 44px 0 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-primary);
  margin: 28px 0 14px;
}

.article-body ul, .article-body ol {
  margin-bottom: 24px;
  padding-left: 24px;
}

.article-body li {
  margin-bottom: 10px;
  line-height: 1.75;
}

.article-body a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.article-cta-box {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-md);
  padding: 40px 32px;
  text-align: center;
  margin: 48px 0 20px;
  box-shadow: var(--shadow-glow);
}

.article-cta-box h3 {
  color: #ffffff;
  font-size: 1.48rem;
  margin-bottom: 12px;
}

.article-cta-box p {
  color: var(--text-muted);
  margin-bottom: 24px;
}

/* 知识科普专栏聚合列表卡片 */
.knowledge-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 40px;
}

.knowledge-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 30px;
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

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

.knowledge-card h3 {
  font-size: 1.18rem;
  margin-bottom: 14px;
  line-height: 1.5;
}

.knowledge-card h3 a {
  color: #ffffff;
  text-decoration: none;
  transition: color 0.2s;
}

.knowledge-card h3 a:hover {
  color: var(--color-primary);
}

.knowledge-card p {
  color: var(--text-muted);
  font-size: 0.94rem;
  line-height: 1.7;
  margin-bottom: 22px;
  flex-grow: 1;
}

.knowledge-card .read-more {
  color: var(--color-primary);
  text-decoration: none;
  font-size: 0.94rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap 0.2s ease;
}

.knowledge-card:hover .read-more {
  gap: 10px;
}

/* ==========================================================================
   响应式断点 (@media) - 全面覆盖 360px, 390px, 768px, 992px, 1440px
   ========================================================================== */

@media (max-width: 992px) {
  .hero-container {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .hero-content {
    text-align: center;
  }

  .hero-desc {
    margin-inline: auto;
  }

  .cta-group {
    justify-content: center;
  }

  .trust-badges {
    justify-content: center;
  }

  .hero-hud-card {
    max-width: 620px;
    margin: 0 auto;
    width: 100%;
  }

  .grid-3, .reviews-grid, .knowledge-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 66px;
  }

  .site-header .container {
    gap: 12px;
  }

  .main-nav {
    gap: 10px;
  }

  .main-nav a {
    padding: 6px 10px;
    font-size: 0.9rem;
  }

  .nav-cta {
    padding: 0 16px;
    min-height: 42px;
    font-size: 0.88rem !important;
  }

  .hero-section {
    padding: 55px 0 40px;
  }

  .grid-3, .media-ai-container, .reviews-grid, .knowledge-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .pricing-wrapper {
    margin-inline: -12px;
    border-radius: 0;
    border-left: none;
    border-right: none;
  }

  .cta-group {
    flex-direction: column;
    width: 100%;
  }

  .cta-group .btn {
    width: 100%;
  }

  .footer-nav {
    gap: 20px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1.05rem;
  }

  .hero-desc {
    font-size: 0.95rem;
  }

  .feature-card, .media-ai-card, .review-card, .knowledge-card {
    padding: 24px 20px;
  }

  .faq-item summary {
    padding: 18px 20px;
    font-size: 1rem;
  }

  .faq-content {
    padding: 16px 20px 20px;
  }
}

@media (max-width: 360px) {
  .container {
    width: calc(100% - 24px);
  }

  .brand-logo {
    font-size: 1.2rem;
  }

  .brand-icon {
    width: 30px;
    height: 30px;
    font-size: 1rem;
  }

  .btn {
    min-height: 44px;
    padding: 0 20px;
    font-size: 0.95rem;
  }
}

/* 减少动画模式 (无障碍支持) */
@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;
  }
}