/* ===================================================================
   云兔 (Cloud Rabbit) 官方加速服务推广落地页 - 极光流光美学核心样式
   Style: Aurora Kinetic Stream & Luminous Dark Mode
   Color Palette: 
     - Deep midnight indigo: #080816
     - Vivid auroral emerald: #10B981
     - Hyper-sonic sky blue: #00D2FF
     - Energetic orange: #FF6B35
   =================================================================== */

/* --- 1. CSS 变量与极光流光主题体系 --- */
:root {
  /* 品牌核心极光色调 (跨主题基底) */
  --aurora-bg: #080816;
  --aurora-emerald: #10B981;
  --aurora-sky: #00D2FF;
  --aurora-orange: #FF6B35;
  --aurora-emerald-glow: rgba(16, 185, 129, 0.28);
  --aurora-sky-glow: rgba(0, 210, 255, 0.28);
  --aurora-orange-glow: rgba(255, 107, 53, 0.28);

  /* 默认：白天模式 (Luminous Light Mode) */
  --bg-main: #f8fafc;
  --bg-subtle: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  --bg-glass: rgba(255, 255, 255, 0.85);
  --border-color: #e2e8f0;
  --border-hover: #cbd5e1;
  --border-focus: #00D2FF;
  
  --text-main: #090d16;
  --text-sub: #334155;
  --text-muted: #64748b;
  
  --brand-primary: #059669; /* 翡翠绿主体 */
  --brand-primary-hover: #10b981;
  --brand-gradient: linear-gradient(135deg, #059669 0%, #0284c7 50%, #ea580c 100%);
  --brand-glow: rgba(5, 150, 105, 0.22);
  
  --badge-bg: rgba(16, 185, 129, 0.1);
  --badge-text: #059669;
  --badge-border: rgba(16, 185, 129, 0.25);
  
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 10px -2px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 28px -5px rgba(15, 23, 42, 0.08);
  --shadow-card: 0 10px 30px -10px rgba(15, 23, 42, 0.08);

  --nav-height: 72px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --transition-normal: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-spring: 0.45s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* 深色模式：Luminous Dark Mode & Deep Midnight Indigo */
[data-theme="dark"] {
  --bg-main: #080816;
  --bg-subtle: #0d0d21;
  --bg-card: rgba(15, 15, 35, 0.72);
  --bg-card-hover: rgba(23, 23, 49, 0.85);
  --bg-glass: rgba(8, 8, 22, 0.85);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(0, 210, 255, 0.35);
  --border-focus: #00D2FF;
  
  --text-main: #f8fafc;
  --text-sub: #cbd5e1;
  --text-muted: #8492a6;
  
  --brand-primary: #10B981;
  --brand-primary-hover: #34d399;
  --brand-gradient: linear-gradient(135deg, #10B981 0%, #00D2FF 50%, #FF6B35 100%);
  --brand-glow: rgba(16, 185, 129, 0.35);
  
  --badge-bg: rgba(16, 185, 129, 0.15);
  --badge-text: #10B981;
  --badge-border: rgba(16, 185, 129, 0.35);
  
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.6);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 14px 35px -5px rgba(0, 0, 0, 0.7);
  --shadow-card: 0 12px 36px -8px rgba(0, 0, 0, 0.7), 0 0 1px 1px rgba(255, 255, 255, 0.06);
}

/* --- 2. 基础重置与全局排版 --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  transition: background-color var(--transition-normal), color var(--transition-normal);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  position: relative;
}

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

.container {
  width: 100%;
  max-width: 1220px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* 极光流光渐变文本 */
.gradient-text {
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
  font-weight: 850;
}

.gradient-text-sky {
  background: linear-gradient(135deg, #00D2FF 0%, #10B981 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

/* 区域通用样式 */
.section {
  padding: 100px 0;
  position: relative;
}

.section-alt {
  background-color: var(--bg-subtle);
  transition: background-color var(--transition-normal);
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 56px auto;
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: var(--badge-bg);
  color: var(--badge-text);
  border: 1px solid var(--badge-border);
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 18px;
  letter-spacing: 0.8px;
  text-transform: uppercase;
}

.section-badge svg {
  color: var(--aurora-emerald);
}

.section-title {
  font-size: 2.35rem;
  font-weight: 850;
  line-height: 1.25;
  color: var(--text-main);
  margin-bottom: 16px;
  letter-spacing: -0.025em;
}

.section-desc {
  font-size: 1.08rem;
  color: var(--text-sub);
  line-height: 1.68;
}

/* --- 3. 头部导航栏 (Navbar) --- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  background: var(--bg-glass);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-color);
  transition: background var(--transition-normal), border-color var(--transition-normal);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 850;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.brand-icon-wrapper {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, #10B981 0%, #00D2FF 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: 0 4px 16px var(--aurora-emerald-glow);
}

.brand-tag {
  font-size: 0.7rem;
  font-weight: 800;
  padding: 2px 7px;
  border-radius: 4px;
  background: rgba(16, 185, 129, 0.12);
  color: var(--aurora-emerald);
  border: 1px solid rgba(16, 185, 129, 0.3);
  margin-left: 2px;
}

/* 导航链接目录 */
.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  list-style: none;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-sub);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-normal);
  position: relative;
}

.nav-link:hover {
  color: var(--aurora-emerald);
  background: var(--badge-bg);
}

.nav-link.active {
  color: var(--aurora-emerald);
  font-weight: 700;
}

/* 导航操作区 (切换按钮 + CTA) */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* 昼夜模式切换按钮 */
.theme-toggle-btn {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-sub);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  backdrop-filter: blur(8px);
}

.theme-toggle-btn:hover {
  border-color: var(--aurora-sky);
  color: var(--aurora-sky);
  transform: translateY(-2px);
  box-shadow: 0 4px 14px var(--aurora-sky-glow);
}

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

.icon-sun { display: none; }
.icon-moon { display: block; }
[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }

/* --- 4. 按钮系统 --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.95rem;
  font-weight: 700;
  padding: 12px 24px;
  border-radius: var(--radius-full);
  transition: all var(--transition-normal);
  cursor: pointer;
  white-space: nowrap;
  border: none;
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.88rem;
}

.btn-lg {
  padding: 15px 34px;
  font-size: 1.05rem;
  min-height: 52px;
}

.btn-primary {
  background: linear-gradient(135deg, #10B981 0%, #00D2FF 100%);
  color: #ffffff;
  box-shadow: 0 6px 20px var(--aurora-emerald-glow);
  position: relative;
  overflow: hidden;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px var(--aurora-sky-glow);
  color: #ffffff;
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--aurora-sky);
  color: var(--aurora-sky);
  transform: translateY(-2px);
}

.btn-white {
  background: #ffffff;
  color: #080816;
  font-weight: 800;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

.btn-white:hover {
  transform: translateY(-2px);
  background: #f1f5f9;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
}

.btn-block {
  width: 100%;
}

/* --- 5. 主视觉区 (Hero Section) & Canvas 动态极光流光 --- */
.hero-section {
  position: relative;
  padding: 90px 0 110px 0;
  overflow: hidden;
}

/* Canvas 交互极光层 */
#auroraCanvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.7;
  transition: opacity 0.5s ease;
}

[data-theme="dark"] #auroraCanvas {
  opacity: 0.95;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.hero-title {
  font-size: 3.6rem;
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.035em;
  margin-bottom: 24px;
}

.hero-subtitle {
  font-size: 1.25rem;
  line-height: 1.68;
  color: var(--text-sub);
  margin-bottom: 40px;
  max-width: 740px;
  margin-left: auto;
  margin-right: auto;
}

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

.hero-trust-bar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 28px;
  padding: 14px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-sm);
  margin-bottom: 48px;
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-sub);
}

.trust-item svg {
  color: var(--aurora-emerald);
}

/* --- 6. 极速对比沙盒测速组件 (Speed Benchmark Sandbox) --- */
.benchmark-widget {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  box-shadow: var(--shadow-card);
  max-width: 940px;
  margin: 0 auto;
  text-align: left;
  backdrop-filter: blur(14px);
  position: relative;
}

.benchmark-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 28px;
  flex-wrap: wrap;
  gap: 16px;
}

.benchmark-title-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
}

.benchmark-title-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: rgba(0, 210, 255, 0.12);
  color: var(--aurora-sky);
  display: flex;
  align-items: center;
  justify-content: center;
}

.benchmark-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
}

.btn-benchmark-start {
  background: linear-gradient(135deg, #10B981 0%, #00D2FF 100%);
  color: #ffffff;
  padding: 10px 22px;
  border-radius: var(--radius-full);
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 4px 16px var(--aurora-emerald-glow);
  cursor: pointer;
  border: none;
  transition: all var(--transition-normal);
}

.btn-benchmark-start:hover {
  transform: scale(1.03);
  box-shadow: 0 6px 22px var(--aurora-sky-glow);
}

/* 双轨赛道 */
.race-tracks {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 30px;
}

.race-track-item {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px 22px;
}

.track-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
  font-size: 0.92rem;
  font-weight: 700;
}

.track-label {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-main);
}

.track-val {
  font-family: monospace;
  font-size: 1.05rem;
  color: var(--text-muted);
}

.track-bar-bg {
  width: 100%;
  height: 12px;
  background: rgba(120, 130, 150, 0.15);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
}

.track-bar-fill {
  height: 100%;
  width: 0%;
  border-radius: var(--radius-full);
  transition: width 1.2s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
}

/* 公共公网：橙色拥堵 */
.track-bar-public {
  background: linear-gradient(90deg, #f59e0b, #ef4444);
}

/* 云兔 IPLC：极光绿蓝光轨 */
.track-bar-yuntu {
  background: linear-gradient(90deg, #10B981, #00D2FF);
  box-shadow: 0 0 16px var(--aurora-sky-glow);
}

/* 光轨粒子尾迹 */
.track-bar-yuntu::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 30px;
  background: #ffffff;
  filter: blur(4px);
  border-radius: var(--radius-full);
  opacity: 0.8;
}

/* 测速实时指标仪表板 */
.benchmark-metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  border-top: 1px solid var(--border-color);
  padding-top: 24px;
}

.benchmark-metric-box {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px 16px;
}

.b-metric-title {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.b-metric-num {
  font-size: 1.45rem;
  font-weight: 850;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.b-metric-status {
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--aurora-emerald);
  margin-top: 2px;
}

/* --- 7. 产品核心优势介绍 (3个图文卡片) --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 38px 30px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #10B981, #00D2FF);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--aurora-sky);
  box-shadow: var(--shadow-lg);
}

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

.feature-icon-box {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-md);
  background: var(--badge-bg);
  border: 1px solid var(--badge-border);
  color: var(--aurora-emerald);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
}

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

.feature-title {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 14px;
  color: var(--text-main);
}

.feature-desc {
  font-size: 0.96rem;
  color: var(--text-sub);
  line-height: 1.68;
  margin-bottom: 22px;
  flex-grow: 1;
}

.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  border-top: 1px solid var(--border-color);
  padding-top: 20px;
}

.feature-list li {
  font-size: 0.88rem;
  color: var(--text-sub);
  display: flex;
  align-items: center;
  gap: 8px;
}

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

/* --- 8. 流媒体解锁矩阵 (Live Streaming Unlock Matrix) & 悬浮翻转徽章 --- */
.streaming-matrix-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.stream-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 26px 24px;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  position: relative;
  cursor: pointer;
}

.stream-card:hover {
  transform: translateY(-5px);
  border-color: var(--aurora-emerald);
  box-shadow: 0 12px 30px -8px var(--aurora-emerald-glow);
}

.stream-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.stream-platform-name {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
}

.stream-platform-badge {
  font-size: 0.76rem;
  font-weight: 800;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  background: var(--badge-bg);
  color: var(--aurora-emerald);
  border: 1px solid var(--badge-border);
}

.stream-card-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 18px;
}

/* 翻转/展开的延迟与解锁徽章 */
.stream-status-flip {
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px dashed var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.84rem;
}

.flip-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  color: var(--aurora-emerald);
  transition: all var(--transition-normal);
}

.stream-card:hover .flip-badge {
  transform: scale(1.05);
  color: #00D2FF;
}

.flip-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--aurora-emerald);
  box-shadow: 0 0 8px var(--aurora-emerald);
}

/* --- 9. AI 支持图卡 (AI Support Hub) - 真实矢量计量器与吞吐量 --- */
.ai-section-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 48px;
  box-shadow: var(--shadow-card);
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: center;
}

.ai-card-title {
  font-size: 2rem;
  font-weight: 850;
  margin-bottom: 16px;
  color: var(--text-main);
}

.ai-card-desc {
  font-size: 1.05rem;
  color: var(--text-sub);
  line-height: 1.7;
  margin-bottom: 28px;
}

.ai-tags-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
}

.ai-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 15px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-main);
  transition: all var(--transition-normal);
}

.ai-pill:hover {
  background: rgba(0, 210, 255, 0.1);
  border-color: var(--aurora-sky);
  color: var(--aurora-sky);
}

/* 吞吐量仪表与服务器机架指标卡 */
.ai-gauge-panel {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.gauge-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.gauge-name {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-sub);
  display: flex;
  align-items: center;
  gap: 8px;
}

.gauge-val {
  font-size: 1.25rem;
  font-weight: 850;
  font-family: monospace;
  color: var(--aurora-emerald);
}

/* --- 10. 套餐价格对比表 (Flexible Data Quota Hub) --- */
.pricing-switch-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 48px;
}

.pricing-switch-pill {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  padding: 4px;
  display: inline-flex;
  position: relative;
  box-shadow: var(--shadow-sm);
}

.pricing-switch-btn {
  padding: 9px 24px;
  border-radius: var(--radius-full);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-normal);
  border: none;
  background: transparent;
}

.pricing-switch-btn.active {
  background: linear-gradient(135deg, #10B981, #00D2FF);
  color: #ffffff;
  box-shadow: 0 4px 14px var(--aurora-emerald-glow);
}

.save-badge {
  background: rgba(255, 107, 53, 0.15);
  color: var(--aurora-orange);
  border: 1px solid rgba(255, 107, 53, 0.3);
  font-size: 0.78rem;
  font-weight: 800;
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

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

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.pricing-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card);
}

.pricing-card.featured {
  border: 2px solid var(--aurora-emerald);
  box-shadow: 0 16px 40px -10px var(--aurora-emerald-glow);
  transform: scale(1.02);
}

.pricing-card.featured:hover {
  transform: scale(1.02) translateY(-6px);
}

.featured-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #10B981 0%, #00D2FF 100%);
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 800;
  padding: 4px 18px;
  border-radius: var(--radius-full);
  letter-spacing: 0.6px;
  box-shadow: 0 4px 14px var(--aurora-emerald-glow);
}

.pricing-header {
  text-align: center;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 24px;
}

.pricing-plan-name {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 8px;
}

.pricing-plan-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  min-height: 42px;
}

.pricing-price-box {
  margin-top: 16px;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
}

.price-currency {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--aurora-emerald);
}

.price-number {
  font-size: 3.2rem;
  font-weight: 900;
  line-height: 1;
  color: var(--text-main);
  letter-spacing: -0.03em;
  transition: transform var(--transition-spring);
}

.price-period {
  font-size: 0.92rem;
  color: var(--text-muted);
}

.pricing-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 32px;
  flex-grow: 1;
}

.pricing-features li {
  font-size: 0.92rem;
  color: var(--text-sub);
  display: flex;
  align-items: center;
  gap: 10px;
}

.pricing-features li svg {
  color: var(--aurora-emerald);
  flex-shrink: 0;
}

.pricing-features li.disabled {
  color: var(--text-muted);
  text-decoration: line-through;
  opacity: 0.6;
}

.pricing-features li.disabled svg {
  color: var(--text-muted);
}

/* --- 11. 用户评价 (Testimonials) --- */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px 22px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

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

.testimonial-rating {
  display: flex;
  gap: 4px;
  color: var(--aurora-orange);
  margin-bottom: 14px;
}

.testimonial-text {
  font-size: 0.92rem;
  color: var(--text-sub);
  line-height: 1.62;
  margin-bottom: 20px;
  flex-grow: 1;
}

.testimonial-user {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border-color);
  padding-top: 14px;
}

.user-avatar-circle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--badge-bg);
  color: var(--aurora-emerald);
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
  border: 1px solid var(--badge-border);
}

.user-meta-name {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-main);
}

.user-meta-role {
  font-size: 0.76rem;
  color: var(--text-muted);
}

/* --- 12. 常见问题 (FAQ Accordion) --- */
.faq-container {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

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

.faq-item[open] {
  border-color: var(--aurora-emerald);
  box-shadow: var(--shadow-sm);
}

.faq-summary {
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 750;
  color: var(--text-main);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

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

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

.faq-item[open] .faq-icon-arrow {
  transform: rotate(180deg);
  color: var(--aurora-emerald);
}

.faq-body {
  padding: 0 24px 22px 24px;
  font-size: 0.96rem;
  color: var(--text-sub);
  line-height: 1.7;
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
}

/* --- 13. 呼吁转化大横幅 (CTA Banner) --- */
.cta-banner-section {
  padding: 80px 0;
}

.cta-banner-card {
  background: linear-gradient(135deg, #10B981 0%, #00D2FF 50%, #FF6B35 100%);
  border-radius: var(--radius-lg);
  padding: 68px 40px;
  text-align: center;
  color: #ffffff;
  box-shadow: 0 24px 50px -10px var(--aurora-emerald-glow);
  position: relative;
  overflow: hidden;
}

.cta-banner-title {
  font-size: 2.6rem;
  font-weight: 850;
  margin-bottom: 16px;
  letter-spacing: -0.025em;
}

.cta-banner-desc {
  font-size: 1.15rem;
  opacity: 0.95;
  max-width: 680px;
  margin: 0 auto 36px auto;
  line-height: 1.65;
}

/* --- 14. 页脚 (Footer) - 严格只保留四个标题 --- */
.site-footer {
  background: var(--bg-subtle);
  border-top: 1px solid var(--border-color);
  padding: 56px 0 36px 0;
  margin-top: auto;
  transition: background var(--transition-normal), border-color var(--transition-normal);
}

.footer-nav-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 48px;
  margin-bottom: 32px;
}

.footer-link-item {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-sub);
  transition: all var(--transition-normal);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
}

.footer-link-item:hover {
  color: var(--aurora-emerald);
  background: var(--badge-bg);
}

.footer-divider {
  width: 100%;
  height: 1px;
  background: var(--border-color);
  margin-bottom: 28px;
}

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

.footer-bottom a {
  color: var(--text-sub);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.footer-bottom a:hover {
  color: var(--aurora-emerald);
}

/* --- 15. 子页面排版 (Subpages) --- */
.subpage-hero {
  padding: 60px 0 40px 0;
  text-align: center;
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border-color);
}

.subpage-hero-title {
  font-size: 2.5rem;
  font-weight: 850;
  color: var(--text-main);
  margin-bottom: 12px;
}

.subpage-hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-sub);
  max-width: 600px;
  margin: 0 auto;
}

.article-content {
  max-width: 860px;
  margin: 50px auto 80px auto;
  line-height: 1.8;
  color: var(--text-sub);
}

.article-content h2 {
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--text-main);
  margin-top: 40px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.article-content p {
  margin-bottom: 18px;
  font-size: 1rem;
}

.article-content ul {
  margin-left: 24px;
  margin-bottom: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.article-alert {
  background: var(--badge-bg);
  border-left: 4px solid var(--aurora-emerald);
  padding: 16px 20px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 24px 0;
  color: var(--text-main);
  font-size: 0.95rem;
}

.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  margin-top: 40px;
}

.sitemap-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}

.sitemap-card-title {
  font-size: 1.25rem;
  font-weight: 750;
  color: var(--text-main);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.sitemap-links-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.sitemap-links-list li a {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-sub);
  font-size: 0.95rem;
  transition: all var(--transition-normal);
}

.sitemap-links-list li a:hover {
  color: var(--aurora-emerald);
  transform: translateX(4px);
}

/* --- 16. 全端响应式适配媒体查询 (@media) --- */

@media screen and (max-width: 1024px) {
  .hero-title {
    font-size: 2.85rem;
  }
  
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .features-grid .feature-card:last-child {
    grid-column: span 2;
  }
  
  .streaming-matrix-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .ai-section-card {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .pricing-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }
  
  .pricing-card {
    padding: 28px 20px;
  }
  
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .benchmark-metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media screen and (max-width: 768px) {
  :root {
    --nav-height: 64px;
  }
  
  .container {
    padding-left: 18px;
    padding-right: 18px;
  }
  
  .section {
    padding: 60px 0;
  }
  
  .section-title {
    font-size: 1.85rem;
  }
  
  .section-desc {
    font-size: 0.98rem;
  }

  /* 导航栏自适应 */
  .nav-links {
    display: none; /* 移动端精炼显示 */
  }
  
  .hero-section {
    padding: 50px 0 60px 0;
  }
  
  .hero-title {
    font-size: 2.2rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  
  .hero-actions .btn {
    width: 100%;
    min-height: 48px;
  }
  
  .hero-trust-bar {
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    border-radius: var(--radius-md);
  }

  /* 测速沙盒 */
  .benchmark-widget {
    padding: 20px 16px;
  }
  
  .benchmark-metrics-grid {
    grid-template-columns: 1fr;
  }

  /* 核心优势 */
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .features-grid .feature-card:last-child {
    grid-column: span 1;
  }

  /* 流媒体解锁矩阵单列 */
  .streaming-matrix-grid {
    grid-template-columns: 1fr;
  }

  /* AI 区域 */
  .ai-section-card {
    padding: 24px 18px;
  }

  /* 套餐单列 */
  .pricing-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  
  .pricing-card.featured {
    transform: none;
  }
  
  .pricing-card.featured:hover {
    transform: translateY(-4px);
  }

  /* 评价单列 */
  .testimonials-grid {
    grid-template-columns: 1fr;
  }

  /* 横幅 */
  .cta-banner-card {
    padding: 40px 20px;
  }
  
  .cta-banner-title {
    font-size: 1.85rem;
  }
  
  .cta-banner-card .btn {
    width: 100%;
    min-height: 48px;
  }

  /* 页脚单列 */
  .footer-nav-bar {
    flex-direction: column;
    gap: 16px;
  }
  
  .footer-link-item {
    width: 100%;
    justify-content: center;
    min-height: 44px;
  }

  .sitemap-grid {
    grid-template-columns: 1fr;
  }
}

/* --- 17. SEO 长篇科普文章排版体系 (Articles & Guides) --- */
.article-breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.article-breadcrumbs a {
  color: var(--text-sub);
  transition: color var(--transition-normal);
}

.article-breadcrumbs a:hover {
  color: var(--aurora-emerald);
}

.article-meta-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
  font-size: 0.86rem;
  color: var(--text-muted);
  padding: 14px 0;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 30px;
}

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

/* 文章目录 (Table of Contents) */
.article-toc-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin: 32px 0 40px 0;
  box-shadow: var(--shadow-sm);
  border-left: 4px solid var(--aurora-emerald);
}

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

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

.article-toc-list li a {
  color: var(--text-sub);
  font-size: 0.94rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-normal);
}

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

/* 技术数据对比表格 */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin: 28px 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
  background: var(--bg-card);
}

.article-table th {
  background: var(--bg-subtle);
  padding: 14px 18px;
  font-weight: 750;
  color: var(--text-main);
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

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

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

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

/* 配置文件代码块 */
.code-container {
  background: var(--aurora-bg);
  color: #e2e8f0;
  border-radius: var(--radius-md);
  padding: 20px 22px;
  margin: 24px 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.88rem;
  line-height: 1.6;
  overflow-x: auto;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.4);
}

/* 相关阅读区域 */
.related-posts-section {
  margin-top: 60px;
  padding-top: 40px;
  border-top: 2px dashed var(--border-color);
}

.related-posts-title {
  font-size: 1.5rem;
  font-weight: 850;
  margin-bottom: 24px;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
}

.related-posts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

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

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

.related-post-tag {
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--aurora-emerald);
  margin-bottom: 8px;
}

.related-post-heading {
  font-size: 1.05rem;
  font-weight: 750;
  color: var(--text-main);
  line-height: 1.45;
  margin-bottom: 8px;
}

@media screen and (max-width: 768px) {
  .related-posts-grid {
    grid-template-columns: 1fr;
  }
}