/* ===================================================================
   科技熊VPN机场官网 - 现代化渐变与毛玻璃暗黑视觉设计系统 (TechBear Cyber Glassmorphism)
   Official Landing Page & Knowledge Base System
   =================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&family=Noto+Sans+SC:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  /* 调色盘：深邃星际紫黑背景与科技感渐变 */
  --bg-dark: #070611;
  --bg-deep: #0d0a1e;
  --bg-card: rgba(20, 16, 40, 0.68);
  --bg-card-hover: rgba(30, 24, 58, 0.85);
  --bg-glass: rgba(255, 255, 255, 0.04);
  --bg-glass-strong: rgba(255, 255, 255, 0.08);

  /* 核心渐变紫粉蓝 (科技熊定制电光配色) */
  --gradient-primary: linear-gradient(135deg, #7928ca 0%, #a855f7 50%, #ec4899 100%);
  --gradient-cyber: linear-gradient(135deg, #00f2fe 0%, #4facfe 50%, #6366f1 100%);
  --gradient-btn: linear-gradient(135deg, #9333ea 0%, #c026d3 50%, #f43f5e 100%);
  --gradient-btn-hover: linear-gradient(135deg, #7e22ce 0%, #a21caf 50%, #e11d48 100%);
  --gradient-glow: radial-gradient(circle, rgba(168, 85, 247, 0.4) 0%, rgba(236, 72, 153, 0.15) 50%, transparent 70%);
  --gradient-subtle: linear-gradient(180deg, rgba(168, 85, 247, 0.12) 0%, rgba(13, 10, 30, 0) 100%);
  --gradient-text: linear-gradient(135deg, #ffffff 20%, #d8b4fe 60%, #f472b6 100%);

  /* 边框与阴影 */
  --border-glass: rgba(255, 255, 255, 0.09);
  --border-glass-bright: rgba(192, 132, 252, 0.4);
  --border-active: rgba(236, 72, 153, 0.6);
  --shadow-card: 0 20px 40px -15px rgba(0, 0, 0, 0.7), 0 0 30px rgba(168, 85, 247, 0.08);
  --shadow-glow: 0 0 25px rgba(168, 85, 247, 0.5);
  --shadow-pink-glow: 0 0 25px rgba(244, 63, 94, 0.5);

  /* 文字颜色 */
  --text-main: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --accent-purple: #c084fc;
  --accent-pink: #f472b6;
  --accent-cyan: #38bdf8;
  --accent-green: #34d399;
  --accent-yellow: #fbbf24;

  /* 尺寸与圆角 */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 30px;
  --radius-full: 9999px;

  /* 动画过渡 */
  --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-dark);
  color: var(--text-main);
}

body {
  font-family: 'Plus Jakarta Sans', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.65;
  background: var(--bg-dark);
  color: var(--text-main);
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* 动态背景 Canvas 与光晕层 */
#bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  opacity: 0.85;
}

.ambient-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.45;
  animation: floatOrb 20s ease-in-out infinite alternate;
}

.glow-1 {
  width: 550px;
  height: 550px;
  background: radial-gradient(circle, rgba(147, 51, 234, 0.35), transparent 70%);
  top: -100px;
  right: -50px;
}

.glow-2 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(236, 72, 153, 0.25), transparent 70%);
  bottom: 10%;
  left: -150px;
  animation-delay: -6s;
}

.glow-3 {
  width: 450px;
  height: 450px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.2), transparent 70%);
  top: 45%;
  right: 10%;
  animation-delay: -12s;
}

@keyframes floatOrb {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(60px, 80px) scale(1.15); }
  100% { transform: translate(-40px, 50px) scale(0.9); }
}

/* 容器与布局 */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* 顶部导航栏 */
.navbar {
  position: sticky;
  top: 0;
  width: 100%;
  z-index: 100;
  background: rgba(7, 6, 17, 0.75);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-glass);
  transition: var(--transition);
}

.navbar.scrolled {
  background: rgba(7, 6, 17, 0.92);
  border-bottom: 1px solid rgba(168, 85, 247, 0.25);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: #fff;
  transition: var(--transition);
}

.logo-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--gradient-btn);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 15px rgba(236, 72, 153, 0.4);
  transition: var(--transition);
}

.logo:hover .logo-icon {
  transform: rotate(5deg) scale(1.05);
  box-shadow: 0 6px 20px rgba(168, 85, 247, 0.6);
}

.logo-text {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.logo-text span {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-badge {
  font-size: 0.68rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  background: rgba(168, 85, 247, 0.18);
  border: 1px solid rgba(168, 85, 247, 0.4);
  color: var(--accent-purple);
  margin-left: 6px;
}

/* 导航链接 */
.nav-links {
  display: flex;
  list-style: none;
  align-items: center;
  gap: 28px;
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
  padding: 6px 0;
}

.nav-link:hover, .nav-link.active {
  color: #fff;
}

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

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

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

.mobile-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-glass);
  color: #fff;
  font-size: 1.5rem;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  border-radius: var(--radius-full);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

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

.btn-lg {
  padding: 16px 36px;
  font-size: 1.05rem;
}

.btn-primary {
  background: var(--gradient-btn);
  color: #ffffff;
  box-shadow: 0 4px 20px rgba(168, 85, 247, 0.4);
}

.btn-primary:hover {
  background: var(--gradient-btn-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(236, 72, 153, 0.6);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-glass-bright);
  color: #ffffff;
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(236, 72, 153, 0.5);
  transform: translateY(-2px);
}

.btn-glow {
  animation: pulseGlow 2.5s infinite;
}

@keyframes pulseGlow {
  0% { box-shadow: 0 0 15px rgba(168, 85, 247, 0.4); }
  50% { box-shadow: 0 0 35px rgba(236, 72, 153, 0.8), 0 0 10px rgba(255, 255, 255, 0.5); }
  100% { box-shadow: 0 0 15px rgba(168, 85, 247, 0.4); }
}

/* ===================================================================
   Hero 头部首屏
   =================================================================== */
.hero-section {
  padding: 80px 0 60px 0;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 50px;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(168, 85, 247, 0.12);
  border: 1px solid rgba(168, 85, 247, 0.35);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent-purple);
  width: fit-content;
}

.hero-pill-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-green);
  box-shadow: 0 0 10px var(--accent-green);
  animation: blink 2s infinite ease-in-out;
}

@keyframes blink {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

.hero-title {
  font-size: 3.4rem;
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -1px;
}

.gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero-desc {
  font-size: 1.12rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 10px;
  flex-wrap: wrap;
}

.hero-stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  padding-top: 25px;
  border-top: 1px solid var(--border-glass);
}

.stat-item h3 {
  font-size: 1.8rem;
  font-weight: 800;
  color: #fff;
  font-family: 'JetBrains Mono', monospace;
}

.stat-item p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Hero 右侧动态视觉看板 */
.hero-visual {
  position: relative;
}

.dashboard-card {
  background: var(--bg-card);
  backdrop-filter: blur(25px);
  -webkit-backdrop-filter: blur(25px);
  border: 1px solid var(--border-glass-bright);
  border-radius: var(--radius-xl);
  padding: 30px;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}

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

.card-status-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: var(--radius-full);
  background: rgba(52, 211, 153, 0.15);
  border: 1px solid rgba(52, 211, 153, 0.35);
  color: var(--accent-green);
}

.speed-gauge-wrap {
  text-align: center;
  padding: 30px 0;
}

.speed-number {
  font-size: 3.6rem;
  font-weight: 800;
  font-family: 'JetBrains Mono', monospace;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
}

.speed-unit {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-top: 6px;
}

.node-metrics-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.node-metric-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.03);
  padding: 12px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-glass);
}

.node-flag-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  font-weight: 600;
}

.node-ping {
  font-size: 0.85rem;
  font-family: 'JetBrains Mono', monospace;
  color: var(--accent-green);
  font-weight: 600;
}

/* ===================================================================
   核心优势卡片 Features Grid
   =================================================================== */
.section-padding {
  padding: 90px 0;
}

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 55px auto;
}

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-pink);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.4rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
}

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

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

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 34px 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient-btn);
  opacity: 0;
  transition: var(--transition);
}

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

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

.feature-icon-box {
  width: 58px;
  height: 58px;
  border-radius: 16px;
  background: rgba(168, 85, 247, 0.15);
  border: 1px solid rgba(168, 85, 247, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  color: var(--accent-purple);
  transition: var(--transition);
}

.feature-card:hover .feature-icon-box {
  background: var(--gradient-btn);
  color: #fff;
  transform: scale(1.1);
  box-shadow: 0 8px 20px rgba(168, 85, 247, 0.5);
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.feature-text {
  font-size: 0.93rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ===================================================================
   套餐价格 Pricing Section
   =================================================================== */
.pricing-section {
  position: relative;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-xl);
  padding: 34px 26px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  position: relative;
}

.pricing-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glass-bright);
  transform: translateY(-8px);
  box-shadow: var(--shadow-card);
}

.pricing-card.featured {
  background: rgba(30, 20, 60, 0.75);
  border-color: rgba(236, 72, 153, 0.6);
  box-shadow: 0 0 40px rgba(168, 85, 247, 0.25);
  transform: scale(1.04);
}

.pricing-card.featured:hover {
  transform: scale(1.04) translateY(-8px);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-btn);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 15px rgba(236, 72, 153, 0.6);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.plan-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  min-height: 40px;
}

.plan-price-wrap {
  margin: 24px 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.plan-currency {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent-pink);
}

.plan-price {
  font-size: 3rem;
  font-weight: 800;
  font-family: 'JetBrains Mono', monospace;
  line-height: 1;
}

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

.plan-features {
  list-style: none;
  margin: 15px 0 30px 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
  flex-grow: 1;
}

.plan-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.check-icon {
  color: var(--accent-green);
  font-weight: bold;
}

/* ===================================================================
   客户端支持 Clients Section
   =================================================================== */
.clients-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.client-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 28px 22px;
  text-align: center;
  transition: var(--transition);
}

.client-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glass-bright);
  transform: translateY(-5px);
}

.client-icon {
  width: 50px;
  height: 50px;
  margin: 0 auto 16px auto;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
}

.client-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.client-sub {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

/* ===================================================================
   AI 工具加速专属板块
   =================================================================== */
.ai-section {
  background: linear-gradient(180deg, transparent 0%, rgba(168, 85, 247, 0.05) 50%, transparent 100%);
}

.ai-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.ai-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 30px;
  transition: var(--transition);
}

.ai-card:hover {
  border-color: var(--border-glass-bright);
  transform: translateY(-6px);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5);
}

.ai-card-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.ai-logo-box {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(56, 189, 248, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
}

.ai-name {
  font-size: 1.2rem;
  font-weight: 700;
}

.ai-status {
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: rgba(52, 211, 153, 0.15);
  color: var(--accent-green);
  border: 1px solid rgba(52, 211, 153, 0.3);
}

/* ===================================================================
   知识库文章精选 12 篇矩阵
   =================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  text-decoration: none;
  color: inherit;
}

.article-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glass-bright);
  transform: translateY(-6px);
  box-shadow: var(--shadow-card);
}

.article-category {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent-purple);
  text-transform: uppercase;
  margin-bottom: 10px;
}

.article-title {
  font-size: 1.12rem;
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 12px;
  color: #fff;
  transition: var(--transition);
}

.article-card:hover .article-title {
  color: var(--accent-pink);
}

.article-excerpt {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-dim);
  padding-top: 14px;
  border-top: 1px solid var(--border-glass);
}

.article-read-more {
  color: var(--accent-cyan);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* ===================================================================
   常见问题手风琴 FAQ Section
   =================================================================== */
.faq-container {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.faq-item.active {
  border-color: var(--border-glass-bright);
  background: var(--bg-card-hover);
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  background: none;
  border: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  font-size: 1.05rem;
  font-weight: 600;
  color: #fff;
  cursor: pointer;
  transition: var(--transition);
}

.faq-question:hover {
  color: var(--accent-purple);
}

.faq-chevron {
  font-size: 1.2rem;
  transition: transform 0.3s ease;
  color: var(--text-muted);
}

.faq-item.active .faq-chevron {
  transform: rotate(180deg);
  color: var(--accent-pink);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  padding: 0 24px;
}

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

/* ===================================================================
   底部大横幅 CTA & Footer
   =================================================================== */
.cta-banner-section {
  padding: 80px 0 100px 0;
}

.cta-box {
  background: linear-gradient(135deg, rgba(147, 51, 234, 0.25) 0%, rgba(236, 72, 153, 0.2) 100%);
  border: 1px solid var(--border-glass-bright);
  border-radius: var(--radius-xl);
  padding: 60px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
}

.cta-title {
  font-size: 2.6rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-desc {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 650px;
  margin: 0 auto 32px auto;
}

.footer {
  background: rgba(5, 4, 10, 0.95);
  border-top: 1px solid var(--border-glass);
  padding: 60px 0 30px 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 40px;
}

.footer-col h4 {
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 18px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

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

.footer-links a:hover {
  color: var(--accent-purple);
  padding-left: 4px;
}

.footer-bottom {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid var(--border-glass);
  font-size: 0.82rem;
  color: var(--text-dim);
}

/* ===================================================================
   文章内容页专用样式 (Article Layout & Typography)
   =================================================================== */
.article-container {
  max-width: 920px;
  margin: 0 auto;
  padding: 60px 24px 100px 24px;
  position: relative;
  z-index: 1;
}

.article-header {
  margin-bottom: 40px;
  padding-bottom: 25px;
  border-bottom: 1px solid var(--border-glass);
}

.article-breadcrumb {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.article-breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
}

.article-breadcrumb a:hover {
  color: var(--accent-purple);
}

.article-page-title {
  font-size: 2.4rem;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.5px;
  margin-bottom: 18px;
  color: #fff;
}

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

/* 顶部快速开通优惠 Banner */
.coupon-banner {
  background: linear-gradient(135deg, rgba(147, 51, 234, 0.22) 0%, rgba(236, 72, 153, 0.18) 100%);
  border: 1px solid var(--border-glass-bright);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}

.coupon-info h4 {
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 6px;
}

.coupon-info p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* 文章正文 */
.article-body {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text-secondary);
}

.article-body h2 {
  font-size: 1.65rem;
  font-weight: 800;
  color: #ffffff;
  margin: 48px 0 20px 0;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(168, 85, 247, 0.2);
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-body h2::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 24px;
  background: var(--gradient-btn);
  border-radius: 3px;
}

.article-body h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: #f1f5f9;
  margin: 32px 0 16px 0;
}

.article-body p {
  margin-bottom: 20px;
}

.article-body strong {
  color: #ffffff;
  font-weight: 700;
}

.article-body ul, .article-body ol {
  margin: 16px 0 24px 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.article-body li {
  line-height: 1.75;
}

.article-alert {
  background: rgba(168, 85, 247, 0.1);
  border-left: 4px solid var(--accent-purple);
  padding: 18px 22px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 28px 0;
}

.article-alert p {
  margin-bottom: 0;
  color: #e2e8f0;
}

/* 数据测速对比表格 */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin: 30px 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-glass);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  background: rgba(15, 11, 30, 0.6);
  font-size: 0.93rem;
}

.data-table th, .data-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-glass);
}

.data-table th {
  background: rgba(168, 85, 247, 0.15);
  color: #fff;
  font-weight: 700;
}

.data-table tr:hover td {
  background: rgba(255, 255, 255, 0.03);
}

/* 文章推荐与内链跳转区 */
.article-related-section {
  margin-top: 60px;
  padding-top: 40px;
  border-top: 1px solid var(--border-glass);
}

.related-title {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 24px;
  color: #fff;
}

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

.related-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 20px;
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.related-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glass-bright);
  transform: translateY(-3px);
}

.related-card h5 {
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
  transition: var(--transition);
}

.related-card:hover h5 {
  color: var(--accent-pink);
}

.related-card span {
  font-size: 0.8rem;
  color: var(--accent-cyan);
}

/* 响应式断点 */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .features-grid, .pricing-grid, .articles-grid, .ai-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .clients-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.3rem;
  }
  .features-grid, .pricing-grid, .articles-grid, .clients-grid, .ai-grid, .related-grid {
    grid-template-columns: 1fr;
  }
  .nav-links {
    display: none;
    position: absolute;
    top: 76px;
    left: 0;
    width: 100%;
    background: rgba(7, 6, 17, 0.98);
    flex-direction: column;
    padding: 24px;
    border-bottom: 1px solid var(--border-glass);
    gap: 16px;
  }
  .nav-links.show {
    display: flex;
  }
  .mobile-toggle {
    display: block;
  }
  .article-page-title {
    font-size: 1.8rem;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
}