/* ==========================================================================
   疾风云 (JiFeng Cloud) - 长曝光光轨美学原生样式系统
   Long-Exposure Light-Trail UI Design
   色彩基调: 午夜黑曜石 (#07080a) | 电光琥珀金 (#ffaa00) | 光子跃迁紫 (#bf00ff) | 极光青 (#00f0ff)
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. 调色盘与动态主题变量 (Light-Trail Theme Tokens)
   -------------------------------------------------------------------------- */
:root {
  /* 品牌光轨核心基色 */
  --amber: #ffaa00;
  --amber-glow: rgba(255, 170, 0, 0.4);
  --amber-subtle: rgba(255, 170, 0, 0.12);
  
  --violet: #bf00ff;
  --violet-glow: rgba(191, 0, 255, 0.4);
  --violet-subtle: rgba(191, 0, 255, 0.12);
  
  --cyan: #00f0ff;
  --cyan-glow: rgba(0, 240, 255, 0.4);
  
  --trail-gradient: linear-gradient(135deg, #ffaa00 0%, #bf00ff 52%, #00f0ff 100%);
  --trail-gradient-hover: linear-gradient(135deg, #ffb822 0%, #cf26ff 52%, #33f3ff 100%);
  --laser-bar: linear-gradient(90deg, #ffaa00, #bf00ff, #00f0ff, #ffaa00);

  /* 白天模式 (默认: 质感流光白) */
  --bg-body: #f8faff;
  --bg-surface: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f3f6fc;
  --bg-glass: rgba(255, 255, 255, 0.88);
  --bg-subtle: #f0f4fa;
  --bg-code: #e8eef8;
  
  --text-primary: #0a0d14;
  --text-secondary: #475569;
  --text-muted: #8c9ba5;
  
  --border-color: #e2e8f2;
  --border-light: rgba(226, 232, 242, 0.7);
  --border-glow: rgba(255, 170, 0, 0.35);
  
  --shadow-sm: 0 2px 6px rgba(10, 13, 20, 0.04);
  --shadow-md: 0 8px 24px -4px rgba(10, 13, 20, 0.08);
  --shadow-lg: 0 16px 40px -8px rgba(10, 13, 20, 0.12);
  --shadow-trail: 0 4px 20px rgba(255, 170, 0, 0.25);
  
  --grid-line-color: rgba(191, 0, 255, 0.04);
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --container-width: 1200px;
  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 午夜黑曜石模式 (Midnight Obsidian Darkness #07080a) */
[data-theme="dark"] {
  --bg-body: #07080a;
  --bg-surface: #0c0e14;
  --bg-card: #11141c;
  --bg-card-hover: #161b26;
  --bg-glass: rgba(11, 14, 20, 0.85);
  --bg-subtle: #151922;
  --bg-code: #0b0d13;
  
  --text-primary: #f8faff;
  --text-secondary: #a0aec0;
  --text-muted: #5e6c84;
  
  --border-color: #1b202d;
  --border-light: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(255, 170, 0, 0.45);
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.6);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.7);
  --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.85);
  --shadow-trail: 0 0 35px rgba(255, 170, 0, 0.3), 0 0 50px rgba(191, 0, 255, 0.2);
  
  --grid-line-color: rgba(255, 170, 0, 0.06);
}

/* --------------------------------------------------------------------------
   2. 全局基础与高速公路线框网格基底
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 86px;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.65;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
  min-height: 100vh;
  position: relative;
  
  /* 动态高速公路矢量线框背景 (Dynamic highway wireframe grid) */
  background-image: 
    linear-gradient(var(--grid-line-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line-color) 1px, transparent 1px);
  background-size: 48px 48px;
}

/* 鼠标光带 Canvas 画布 (轻量缎带消散效果) */
#cursor-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 99999;
}

/* 前倾加粗几何数字规范 (Bold forward-slanted numerals) */
.num-slant {
  font-family: ui-monospace, "SF Mono", "Roboto Mono", "Fira Code", monospace;
  font-style: italic;
  font-weight: 900;
  letter-spacing: -0.5px;
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

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

/* --------------------------------------------------------------------------
   3. 动态光轨线框面板与微动效 (Traveling Light Paths)
   -------------------------------------------------------------------------- */
.light-trail-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

/* 无缝流动的环状长曝光光轨 (Continuous traveling light path) */
.light-trail-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--amber), var(--violet), transparent);
  transition: all var(--transition-normal);
}

.light-trail-card:hover {
  transform: translateY(-5px);
  border-color: rgba(255, 170, 0, 0.5);
  box-shadow: var(--shadow-trail);
}

.light-trail-card:hover::before {
  left: 100%;
  transition: left 0.9s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 渐变流光文字 */
.text-gradient {
  background: var(--trail-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

/* --------------------------------------------------------------------------
   4. 顶部导航栏 (Header & Navbar)
   -------------------------------------------------------------------------- */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

/* 顶部激光微光线 */
.header::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent 5%, var(--amber) 30%, var(--violet) 70%, transparent 95%);
  opacity: 0.6;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.4rem;
  font-weight: 900;
  letter-spacing: -0.5px;
  color: var(--text-primary);
}

.logo-icon {
  width: 38px;
  height: 38px;
  background: var(--trail-gradient);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: 0 4px 14px var(--amber-glow);
  transform: skewX(-6deg);
  transition: transform var(--transition-fast);
}

.logo:hover .logo-icon {
  transform: skewX(0deg) scale(1.08);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  position: relative;
  padding: 8px 4px;
  transition: color var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  color: var(--amber);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--trail-gradient);
  transition: width var(--transition-fast);
  border-radius: 2px;
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* 精致专业透明昼夜切换按钮 (无粗糙Emoji) */
.theme-toggle-btn {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.theme-toggle-btn:hover {
  border-color: var(--amber);
  color: var(--amber);
  transform: translateY(-2px);
  box-shadow: 0 0 16px var(--amber-glow);
}

.theme-toggle-btn svg {
  width: 20px;
  height: 20px;
}

.icon-sun { display: block; }
.icon-moon { display: none; }

[data-theme="dark"] .icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: block; color: var(--amber); }

/* 核心 CTA 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 24px;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  white-space: nowrap;
  line-height: 1;
}

.btn-primary {
  background: var(--trail-gradient);
  color: #ffffff;
  box-shadow: 0 4px 18px var(--amber-glow);
  position: relative;
  overflow: hidden;
}

.btn-primary:hover {
  background: var(--trail-gradient-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 26px var(--amber-glow), 0 0 35px var(--violet-glow);
  color: #ffffff;
}

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

.btn-outline:hover {
  border-color: var(--amber);
  color: var(--amber);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.btn-lg {
  padding: 15px 36px;
  font-size: 1.1rem;
}

.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 28px;
  height: 20px;
  cursor: pointer;
}

.mobile-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background-color: var(--text-primary);
  border-radius: 2px;
}

/* --------------------------------------------------------------------------
   5. 主视觉区 (Hero Section - 光轨极速)
   -------------------------------------------------------------------------- */
.hero {
  padding: 85px 0 65px;
  position: relative;
  overflow: hidden;
}

.hero-content {
  text-align: center;
  max-width: 920px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 20px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--amber);
  margin-bottom: 26px;
  box-shadow: var(--shadow-sm);
}

.hero-badge-photon {
  width: 8px;
  height: 8px;
  background-color: var(--amber);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--amber);
  animation: photonPulse 1.6s infinite ease-in-out;
}

@keyframes photonPulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.6); opacity: 0.4; }
}

.hero-title {
  font-size: clamp(1.5rem, 3.8vw, 3.2rem);
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -0.5px;
  margin-bottom: 22px;
  color: var(--text-primary);
  white-space: nowrap; /* 绝对不换行 */
  display: inline-block;
  max-width: 100%;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 38px;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-bottom: 50px;
  flex-wrap: wrap;
}

.hero-trust-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 30px;
  font-size: 0.9rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  padding-top: 24px;
  border-top: 1px dashed var(--border-color);
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.trust-item svg {
  color: var(--amber);
  width: 18px;
  height: 18px;
}

/* 光纤网络实时节点交互监控卡片 */
.hero-monitor-card {
  margin-top: 50px;
  padding: 26px;
  position: relative;
}

.monitor-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-color);
}

.monitor-status {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 0.92rem;
}

.pulse-dot {
  width: 10px;
  height: 10px;
  background-color: #10b981;
  border-radius: 50%;
  box-shadow: 0 0 10px #10b981;
}

.monitor-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

.ping-node {
  background: var(--bg-subtle);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.ping-node:hover, .ping-node.bursting {
  border-color: var(--amber);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  box-shadow: 0 0 18px var(--amber-glow);
}

.ping-node-name {
  font-size: 0.9rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

.ping-val {
  font-size: 1.05rem;
  color: #10b981;
}

/* 光子爆发火花动效层 */
.photon-spark {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  pointer-events: none;
  background: radial-gradient(circle at center, rgba(255, 170, 0, 0.4) 0%, transparent 70%);
  opacity: 0;
  animation: sparkFlash 0.5s ease-out;
}

@keyframes sparkFlash {
  0% { opacity: 0; transform: scale(0.5); }
  50% { opacity: 1; transform: scale(1.2); }
  100% { opacity: 0; transform: scale(1.5); }
}

/* --------------------------------------------------------------------------
   6. 通用章节标题
   -------------------------------------------------------------------------- */
.section {
  padding: 85px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 55px;
}

.section-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 10px;
}

.section-title {
  font-size: clamp(1.9rem, 3.6vw, 2.5rem);
  font-weight: 900;
  letter-spacing: -0.6px;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* --------------------------------------------------------------------------
   7. 核心优势 (3个图文卡片)
   -------------------------------------------------------------------------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.feature-card {
  padding: 38px 30px;
  display: flex;
  flex-direction: column;
}

.feature-number {
  font-size: 2rem;
  color: var(--amber);
  opacity: 0.6;
  margin-bottom: 16px;
  line-height: 1;
}

.feature-icon-wrapper {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-md);
  background: var(--bg-subtle);
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--amber);
  margin-bottom: 24px;
}

.feature-icon-wrapper svg {
  width: 30px;
  height: 30px;
}

.feature-title {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 14px;
  color: var(--text-primary);
}

.feature-text {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 22px;
  flex-grow: 1;
}

.feature-bullets {
  display: flex;
  flex-direction: column;
  gap: 10px;
  border-top: 1px solid var(--border-color);
  padding-top: 18px;
}

.bullet-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

.bullet-item svg {
  color: var(--amber);
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   8. 场景解锁 (流媒体图卡 & AI支持图卡 - 坚决拒绝机器人图标)
   -------------------------------------------------------------------------- */
.unlock-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.unlock-card {
  padding: 40px 34px;
  display: flex;
  flex-direction: column;
}

.unlock-badge {
  display: inline-block;
  align-self: flex-start;
  padding: 5px 14px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 800;
  text-transform: uppercase;
  margin-bottom: 18px;
}

.badge-media {
  background: var(--amber-subtle);
  color: var(--amber);
  border: 1px solid var(--amber-glow);
}

.badge-ai {
  background: var(--violet-subtle);
  color: var(--violet);
  border: 1px solid var(--violet-glow);
}

.unlock-title {
  font-size: 1.6rem;
  font-weight: 850;
  margin-bottom: 14px;
  color: var(--text-primary);
}

.unlock-desc {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 26px;
}

.unlock-badges-wall {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
}

.service-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.service-pill:hover {
  border-color: var(--amber);
  color: var(--amber);
  background: var(--bg-card-hover);
}

.service-pill .pill-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--amber);
}

.service-pill.ai-pill .pill-dot {
  background: var(--violet);
}

.unlock-specs {
  margin-top: auto;
  border-top: 1px dashed var(--border-color);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.unlock-specs strong {
  color: var(--text-primary);
}

/* --------------------------------------------------------------------------
   9. 套餐价格表 (真实市场价格参考与对比)
   -------------------------------------------------------------------------- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  align-items: stretch;
  padding-top: 24px; /* 预留顶部悬浮徽章空间，防止遮挡 */
}

.pricing-card {
  padding: 42px 30px 40px;
  display: flex;
  flex-direction: column;
  overflow: visible !important; /* 彻底解除 overflow: hidden 对顶部徽章的遮挡裁剪 */
  position: relative;
}

.pricing-card::before {
  display: none; /* 移除外凸光线，避免在 overflow:visible 下溢出 */
}

.pricing-card.featured {
  border: 2px solid var(--amber);
  box-shadow: 0 0 35px var(--amber-glow);
  transform: scale(1.03);
  z-index: 5;
  overflow: visible !important;
}

.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-6px);
}

.popular-ribbon {
  position: absolute;
  top: -16px; /* 优雅骑缝跨立在卡片顶端 */
  left: 50%;
  transform: translateX(-50%);
  background: var(--trail-gradient);
  color: #ffffff;
  padding: 6px 24px;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  box-shadow: 0 4px 18px var(--amber-glow);
  white-space: nowrap;
  z-index: 20; /* 确保悬浮在边框与卡片内容之上，绝对不被遮挡 */
  line-height: 1.2;
}

.plan-header {
  margin-bottom: 24px;
  text-align: center;
}

.plan-name {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.plan-subtitle {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.plan-price-wrapper {
  margin: 20px 0;
  display: flex;
  align-items: baseline;
  justify-content: center;
}

.currency {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--amber);
  margin-right: 4px;
}

.price {
  font-size: 3.2rem;
  color: var(--text-primary);
  line-height: 1;
}

.period {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-left: 6px;
}

.plan-features {
  display: flex;
  flex-direction: column;
  gap: 15px;
  margin-bottom: 34px;
  flex-grow: 1;
}

.plan-feature-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.94rem;
  color: var(--text-secondary);
}

.plan-feature-item svg {
  color: var(--amber);
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.plan-feature-item.muted {
  color: var(--text-muted);
  text-decoration: line-through;
}

.plan-feature-item.muted svg {
  color: var(--text-muted);
}

.pricing-card .btn {
  width: 100%;
}

/* --------------------------------------------------------------------------
   10. 用户评价 (Reviews)
   -------------------------------------------------------------------------- */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 26px;
}

.review-card {
  padding: 30px;
  display: flex;
  flex-direction: column;
}

.review-stars {
  display: flex;
  gap: 4px;
  color: var(--amber);
  margin-bottom: 16px;
}

.review-stars svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.review-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 22px;
  flex-grow: 1;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 14px;
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
}

.author-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--trail-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 800;
  font-size: 1rem;
}

.author-info h4 {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-primary);
}

.author-info p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   11. 常见问题 (FAQ 手风琴)
   -------------------------------------------------------------------------- */
.faq-accordion {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  padding: 22px 26px;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--text-primary);
  background: none;
  cursor: pointer;
}

.faq-icon {
  width: 20px;
  height: 20px;
  color: var(--text-muted);
  transition: transform var(--transition-normal);
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
  color: var(--amber);
}

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

.faq-answer-inner {
  padding: 0 26px 22px;
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --------------------------------------------------------------------------
   12. 推荐资讯专页样式 (pulse-news-9f2a.html)
   -------------------------------------------------------------------------- */
.articles-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.article-card {
  padding: 32px 30px;
}

.article-meta-header {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.article-category {
  padding: 3px 12px;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 0.78rem;
}

.cat-amber { background: var(--amber-subtle); color: var(--amber); border: 1px solid var(--amber-glow); }
.cat-violet { background: var(--violet-subtle); color: var(--violet); border: 1px solid var(--violet-glow); }
.cat-cyan { background: rgba(0, 240, 255, 0.12); color: var(--cyan); border: 1px solid var(--cyan-glow); }

.article-title {
  font-size: 1.45rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-primary);
  line-height: 1.4;
}

.article-title a:hover {
  color: var(--amber);
}

.article-excerpt {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 20px;
}

.article-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
  flex-wrap: wrap;
  gap: 12px;
}

.article-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tag-pill {
  font-size: 0.8rem;
  padding: 3px 10px;
  background: var(--bg-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
}

.btn-text-link {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--amber);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-text-link:hover {
  color: var(--violet);
  transform: translateX(3px);
}

/* --------------------------------------------------------------------------
   13. 页脚 (Footer - 严格仅保留四个指定标题链接)
   -------------------------------------------------------------------------- */
.footer {
  margin-top: auto;
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: 55px 0 35px;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  margin-bottom: 26px;
  flex-wrap: wrap;
}

.footer-nav-link {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-secondary);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.footer-nav-link:hover {
  color: var(--amber);
  background: var(--bg-subtle);
  box-shadow: 0 0 12px var(--amber-glow);
}

.footer-bottom {
  text-align: center;
  font-size: 0.86rem;
  color: var(--text-muted);
  border-top: 1px dashed var(--border-color);
  padding-top: 24px;
}

.footer-brand-tag {
  margin-bottom: 8px;
  font-weight: 600;
}

/* --------------------------------------------------------------------------
   14. 独立二级页面排版
   -------------------------------------------------------------------------- */
.doc-page {
  padding: 60px 0 85px;
}

.doc-container {
  max-width: 880px;
  margin: 0 auto;
}

.doc-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 26px;
}

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

.doc-card {
  padding: 50px;
}

.doc-title {
  font-size: 2.3rem;
  font-weight: 900;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.doc-meta {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 34px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border-color);
}

.doc-content h2 {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-top: 38px;
  margin-bottom: 16px;
}

.doc-content p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 18px;
}

.doc-content ul {
  list-style: disc;
  padding-left: 24px;
  margin-bottom: 22px;
}

.doc-content li {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 10px;
}

.alert-box {
  background: var(--bg-subtle);
  border-left: 4px solid var(--amber);
  padding: 18px 22px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 26px 0;
  font-size: 0.96rem;
  color: var(--text-secondary);
}

.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 26px;
  margin-top: 26px;
}

.sitemap-group {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 26px;
}

.sitemap-group h3 {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
}

.sitemap-list li {
  list-style: none;
  margin-bottom: 12px;
}

.sitemap-list a {
  color: var(--text-secondary);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
}

.sitemap-list a:hover {
  color: var(--amber);
  padding-left: 6px;
}

/* --------------------------------------------------------------------------
   15. 响应式媒体查询 (手机端单栏优化)
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .features-grid,
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-6px);
  }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 74px;
    left: 0;
    right: 0;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    display: none;
    box-shadow: var(--shadow-lg);
  }
  
  .nav-links.open {
    display: flex;
  }
  
  .mobile-toggle {
    display: flex;
  }
  
  .hero {
    padding: 55px 0 45px;
  }

  .hero-title {
    font-size: clamp(1.15rem, 5vw, 1.8rem);
    white-space: nowrap;
  }
  
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  
  .hero-cta-group .btn {
    width: 100%;
    min-height: 50px;
  }
  
  .features-grid,
  .unlock-grid,
  .pricing-grid {
    grid-template-columns: 1fr;
    gap: 22px;
  }
  
  .hero-trust-bar {
    gap: 16px;
    flex-direction: column;
    align-items: center;
  }
  
  .doc-card {
    padding: 28px 20px;
  }
  
  .footer-nav {
    flex-direction: column;
    gap: 18px;
  }
}

/* --------------------------------------------------------------------------
   16. 长篇 SEO 文章增强样式 (目录 TOC、对比表格、文章 FAQ 与相关阅读)
   -------------------------------------------------------------------------- */
.toc-box {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--amber);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin: 30px 0 38px;
}

.toc-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-left: 0;
  list-style: none;
}

.toc-list li a {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.toc-list li a:hover {
  color: var(--amber);
  transform: translateX(4px);
}

.toc-num {
  font-family: monospace;
  color: var(--amber);
  font-weight: 700;
  font-size: 0.9rem;
}

.article-table-wrapper {
  overflow-x: auto;
  margin: 26px 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.94rem;
}

.article-table th {
  background: var(--bg-subtle);
  color: var(--text-primary);
  padding: 14px 18px;
  font-weight: 700;
  border-bottom: 1px solid var(--border-color);
}

.article-table td {
  padding: 14px 18px;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-color);
}

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

.article-table tr:hover td {
  background: var(--bg-card-hover);
}

.article-faq-section {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px dashed var(--border-color);
}

.article-faq-card {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 22px 24px;
  margin-bottom: 16px;
}

.article-faq-q {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-faq-q span.q-badge {
  background: var(--amber);
  color: #000000;
  font-size: 0.8rem;
  font-weight: 900;
  padding: 2px 7px;
  border-radius: 4px;
}

.article-faq-a {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

.related-section {
  margin-top: 50px;
  padding-top: 36px;
  border-top: 1px solid var(--border-color);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin-top: 20px;
}

.related-card {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: all var(--transition-fast);
  display: flex;
  flex-direction: column;
}

.related-card:hover {
  border-color: var(--amber);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.related-card-title {
  font-size: 0.96rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.5;
}

.related-card:hover .related-card-title {
  color: var(--amber);
}

.related-card-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: auto;
}