/* ==========================================================================
   梯子云 (Tiziyun) - 全球极速专线加速器
   科技高级深邃极客风 (Premium Cyber-Tech / Next-Gen SaaS Aesthetic)
   Pure Vanilla CSS - 零框架依赖、毫秒级秒开、全天候高定科技质感
   ========================================================================== */

:root {
  /* 深邃虚空与高定黑曜石基底 */
  --bg-primary: #05070d;
  --bg-secondary: #090d16;
  --bg-card: rgba(13, 19, 32, 0.72);
  --bg-card-hover: rgba(20, 28, 48, 0.88);
  --bg-glass: rgba(10, 14, 24, 0.75);
  
  /* 科技高级光能光谱 */
  --accent-cyan: #00f2fe;
  --accent-blue: #4facfe;
  --accent-indigo: #6366f1;
  --accent-purple: #8b5cf6;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  
  /* 标志性高定渐变 */
  --brand-gradient: linear-gradient(135deg, #00f2fe 0%, #4facfe 50%, #6366f1 100%);
  --brand-gradient-hover: linear-gradient(135deg, #38bdf8 0%, #00f2fe 100%);
  --badge-glow-gradient: linear-gradient(135deg, rgba(0, 242, 254, 0.15) 0%, rgba(99, 102, 241, 0.15) 100%);
  --card-glow-featured: linear-gradient(180deg, rgba(0, 242, 254, 0.12) 0%, rgba(13, 19, 32, 0.95) 100%);
  
  /* 纤细微透光边框与高定微阴影 */
  --border-hairline: 1px solid rgba(255, 255, 255, 0.08);
  --border-light: 1px solid rgba(255, 255, 255, 0.14);
  --border-active: rgba(0, 242, 254, 0.45);
  --border-featured: 1px solid rgba(0, 242, 254, 0.55);

  --shadow-subtle: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-card: 0 16px 36px -12px rgba(0, 0, 0, 0.6), inset 0 1px 0 rgba(255, 255, 255, 0.08);
  --shadow-glow-cyan: 0 0 35px rgba(0, 242, 254, 0.3);
  --shadow-glow-purple: 0 0 35px rgba(139, 92, 246, 0.25);
  --shadow-btn: 0 4px 20px rgba(0, 242, 254, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.4);

  /* 文字颜色 */
  --text-main: #f8fafc;
  --text-sub: #94a3b8;
  --text-muted: #64748b;
  --text-light: #e2e8f0;

  /* 倒角系统（兼具现代科技与视觉亲和力） */
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* 高级科技字体栈 */
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Inter", "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", Consolas, Monaco, monospace;
  
  --transition: all 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 宇宙星云与激光微网格背景 (Cosmic Cyber Micro-Grid) */
body {
  line-height: 1.65;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  background-color: var(--bg-primary);
  background-image: 
    radial-gradient(circle at 50% -10%, rgba(0, 242, 254, 0.15) 0%, transparent 60%),
    radial-gradient(circle at 85% 25%, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 15% 65%, rgba(0, 242, 254, 0.06) 0%, transparent 45%),
    radial-gradient(rgba(255, 255, 255, 0.06) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 100% 100%, 32px 32px;
}

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

img, svg {
  display: block;
}

ul, ol {
  list-style: none;
}

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

.container {
  width: 100%;
  max-width: 1220px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 科技高级板块标题体系 */
.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 56px auto;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 16px;
  font-size: 0.82rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--accent-cyan);
  background: rgba(0, 242, 254, 0.08);
  border: 1px solid rgba(0, 242, 254, 0.25);
  border-radius: var(--radius-full);
  margin-bottom: 18px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  box-shadow: 0 0 16px rgba(0, 242, 254, 0.15);
}

.section-tag::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--accent-cyan);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-cyan);
}

.section-title {
  font-size: 2.45rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
  letter-spacing: -0.025em;
  color: #ffffff;
}

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

.text-gradient {
  background: linear-gradient(135deg, #ffffff 0%, #a5f3fc 40%, #00f2fe 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

/* --------------------------------------------------------------------------
   高定科技感导航栏 (Premium Navbar)
   -------------------------------------------------------------------------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 72px;
  z-index: 1000;
  background: rgba(6, 9, 16, 0.78);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  transition: var(--transition);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.brand-logo svg {
  width: 32px;
  height: 32px;
  filter: drop-shadow(0 0 12px rgba(0, 242, 254, 0.6));
}

.brand-logo span {
  position: relative;
  font-weight: 900;
  background: linear-gradient(180deg, #ffffff 0%, #cbd5e1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-logo span::after {
  content: ' [PRO]';
  font-size: 0.68rem;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent-cyan);
  vertical-align: super;
  -webkit-text-fill-color: var(--accent-cyan);
  letter-spacing: 0.04em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 0.94rem;
  font-weight: 600;
  color: var(--text-sub);
  position: relative;
  padding: 6px 0;
  transition: var(--transition);
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--brand-gradient);
  transition: var(--transition);
  border-radius: 2px;
  box-shadow: 0 0 8px rgba(0, 242, 254, 0.8);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* 按钮体系：高定质感与触感微反馈 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  font-size: 0.94rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  white-space: nowrap;
  letter-spacing: 0.01em;
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.88rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 14px 34px;
  font-size: 1.05rem;
  border-radius: var(--radius-md);
}

.btn-ghost {
  color: var(--text-light);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
}

.btn-ghost:hover {
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.08);
  transform: translateY(-2px);
}

.btn-outline {
  color: #ffffff;
  background: rgba(0, 242, 254, 0.05);
  border: 1px solid rgba(0, 242, 254, 0.35);
  backdrop-filter: blur(8px);
}

.btn-outline:hover {
  background: rgba(0, 242, 254, 0.15);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  box-shadow: 0 0 24px rgba(0, 242, 254, 0.3);
  transform: translateY(-2px);
}

.btn-primary {
  color: #040813;
  background: var(--brand-gradient);
  border: 1px solid rgba(255, 255, 255, 0.35);
  box-shadow: var(--shadow-btn);
  font-weight: 800;
}

.btn-primary:hover {
  background: var(--brand-gradient-hover);
  box-shadow: 0 6px 28px rgba(0, 242, 254, 0.6), inset 0 1px 0 #ffffff;
  transform: translateY(-2px);
}

.btn-blog {
  color: #ffffff;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.2) 0%, rgba(139, 92, 246, 0.25) 100%);
  border: 1px solid rgba(139, 92, 246, 0.45);
  box-shadow: 0 4px 18px rgba(99, 102, 241, 0.2);
  backdrop-filter: blur(12px);
}

.btn-blog:hover {
  border-color: var(--accent-purple);
  color: #ffffff;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.35) 0%, rgba(139, 92, 246, 0.4) 100%);
  box-shadow: 0 6px 26px rgba(139, 92, 246, 0.45);
  transform: translateY(-2px);
}

/* 移动端汉堡切换 */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--text-main);
}

.mobile-toggle svg {
  width: 26px;
  height: 26px;
}

/* --------------------------------------------------------------------------
   首屏横幅区 (Hero Section) - 科技光芒聚集
   -------------------------------------------------------------------------- */
.hero-section {
  padding-top: 165px;
  padding-bottom: 95px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-badge-wrap {
  margin-bottom: 26px;
}

.discount-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--badge-glow-gradient);
  border: 1px solid rgba(0, 242, 254, 0.35);
  color: #ffffff;
  padding: 8px 22px;
  border-radius: var(--radius-full);
  font-size: 0.92rem;
  font-weight: 700;
  font-family: var(--font-sans);
  box-shadow: 0 0 25px rgba(0, 242, 254, 0.2);
  backdrop-filter: blur(10px);
}

.discount-badge .dot {
  width: 8px;
  height: 8px;
  background: var(--accent-cyan);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent-cyan);
  animation: pulse-dot 1.8s infinite;
}

@keyframes pulse-dot {
  0% { transform: scale(0.9); opacity: 0.6; }
  50% { transform: scale(1.3); opacity: 1; box-shadow: 0 0 14px var(--accent-cyan); }
  100% { transform: scale(0.9); opacity: 0.6; }
}

.hero-title {
  font-size: 3.65rem;
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.035em;
  margin-bottom: 24px;
  max-width: 980px;
  margin-left: auto;
  margin-right: auto;
}

.hero-desc {
  font-size: 1.25rem;
  color: var(--text-sub);
  max-width: 820px;
  margin: 0 auto 40px auto;
  line-height: 1.72;
}

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-bottom: 54px;
  flex-wrap: wrap;
}

.hero-trust {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-family: var(--font-sans);
  flex-wrap: wrap;
}

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

.trust-item svg {
  color: var(--accent-cyan);
  filter: drop-shadow(0 0 6px rgba(0, 242, 254, 0.4));
}

/* --------------------------------------------------------------------------
   核心优势图卡区 (Dynamic Cards Section) - 晶体科技卡片
   -------------------------------------------------------------------------- */
.features-section {
  padding: 85px 0;
  position: relative;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 48px;
}

.feature-card {
  background: var(--bg-card);
  border: var(--border-hairline);
  border-radius: var(--radius-lg);
  padding: 38px 32px;
  position: relative;
  transition: var(--transition);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, rgba(255, 255, 255, 0.2) 50%, transparent 100%);
}

.feature-card:hover {
  border-color: var(--border-active);
  background: var(--bg-card-hover);
  transform: translateY(-5px);
  box-shadow: var(--shadow-glow-cyan), 0 20px 40px rgba(0, 0, 0, 0.6);
}

.feature-icon-wrapper {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-md);
  background: rgba(0, 242, 254, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  border: 1px solid rgba(0, 242, 254, 0.25);
  color: var(--accent-cyan);
  box-shadow: 0 0 20px rgba(0, 242, 254, 0.15);
}

.feature-card:nth-child(2) .feature-icon-wrapper {
  background: rgba(139, 92, 246, 0.08);
  border-color: rgba(139, 92, 246, 0.3);
  color: var(--accent-purple);
  box-shadow: 0 0 20px rgba(139, 92, 246, 0.15);
}

.feature-card:nth-child(3) .feature-icon-wrapper {
  background: rgba(16, 185, 129, 0.08);
  border-color: rgba(16, 185, 129, 0.3);
  color: var(--accent-emerald);
  box-shadow: 0 0 20px rgba(16, 185, 129, 0.15);
}

.feature-card h3 {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: #ffffff;
}

.feature-card p {
  color: var(--text-sub);
  font-size: 0.98rem;
  line-height: 1.68;
}

/* 流媒体与 AI 支持图卡区 (2-col banner grid) */
.streaming-ai-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.media-ai-card {
  background: var(--bg-card);
  border: var(--border-hairline);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  position: relative;
  transition: var(--transition);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(16px);
  overflow: hidden;
}

.media-ai-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-indigo));
  opacity: 0.7;
}

.media-ai-card:nth-child(2)::before {
  background: linear-gradient(90deg, var(--accent-purple), var(--accent-cyan));
}

.media-ai-card:hover {
  border-color: var(--border-active);
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6), 0 0 30px rgba(0, 242, 254, 0.15);
}

.card-badge {
  display: inline-block;
  font-size: 0.76rem;
  font-weight: 800;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
  text-transform: uppercase;
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
}

.badge-stream {
  background: rgba(244, 63, 94, 0.12);
  color: #fb7185;
  border: 1px solid rgba(244, 63, 94, 0.3);
}

.badge-ai {
  background: rgba(139, 92, 246, 0.12);
  color: #c084fc;
  border: 1px solid rgba(139, 92, 246, 0.3);
}

.media-ai-card h3 {
  font-size: 1.48rem;
  font-weight: 800;
  margin-bottom: 14px;
}

.media-ai-card p {
  color: var(--text-sub);
  font-size: 0.98rem;
  line-height: 1.68;
  margin-bottom: 24px;
}

.logo-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  font-size: 0.85rem;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  color: var(--text-light);
  transition: var(--transition);
}

.tag-pill:hover {
  background: rgba(0, 242, 254, 0.08);
  border-color: rgba(0, 242, 254, 0.35);
  color: var(--accent-cyan);
  transform: translateY(-2px);
}

/* --------------------------------------------------------------------------
   定价卡片区 (Pricing Section) - 高端光影阶梯
   -------------------------------------------------------------------------- */
.pricing-section {
  padding: 95px 0;
  position: relative;
}

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

.pricing-card {
  background: var(--bg-card);
  border: var(--border-hairline);
  border-radius: var(--radius-xl);
  padding: 44px 32px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(16px);
}

.pricing-card:hover {
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-5px);
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.7);
}

.pricing-card.featured {
  background: var(--card-glow-featured);
  border: var(--border-featured);
  box-shadow: var(--shadow-glow-cyan), 0 20px 50px rgba(0, 0, 0, 0.7);
  transform: scale(1.03);
  z-index: 2;
}

.pricing-card.featured:hover {
  transform: scale(1.05) translateY(-4px);
  box-shadow: 0 0 50px rgba(0, 242, 254, 0.45), 0 25px 60px rgba(0, 0, 0, 0.8);
}

.pricing-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--brand-gradient);
  color: #040813;
  font-size: 0.8rem;
  font-weight: 800;
  padding: 4px 18px;
  border-radius: var(--radius-full);
  box-shadow: 0 0 20px rgba(0, 242, 254, 0.6);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

.pricing-plan-name {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 6px;
  color: #ffffff;
}

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

.pricing-price-wrap {
  margin: 18px 0;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
}

.currency {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--accent-cyan);
}

.price {
  font-size: 3.4rem;
  font-weight: 900;
  line-height: 1;
  color: #ffffff;
  font-family: var(--font-mono);
}

.unit {
  font-size: 0.95rem;
  color: var(--text-sub);
}

.pricing-traffic {
  display: inline-block;
  background: rgba(0, 242, 254, 0.08);
  border: 1px solid rgba(0, 242, 254, 0.25);
  color: var(--accent-cyan);
  padding: 6px 18px;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 700;
  font-family: var(--font-mono);
  margin-bottom: 22px;
}

.pricing-features {
  margin: 20px 0 34px 0;
  flex-grow: 1;
}

.pricing-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.96rem;
  color: var(--text-sub);
  margin-bottom: 14px;
  line-height: 1.48;
}

.pricing-feature-item svg {
  flex-shrink: 0;
  color: var(--accent-cyan);
  margin-top: 3px;
  filter: drop-shadow(0 0 6px rgba(0, 242, 254, 0.5));
}

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

/* --------------------------------------------------------------------------
   深度特性解析区 (Why Choose Section) - 智能遥测与极客终端
   -------------------------------------------------------------------------- */
.why-section {
  padding: 95px 0;
}

.why-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 52px;
  align-items: center;
  margin-bottom: 84px;
}

.why-row:last-child {
  margin-bottom: 0;
}

.why-text h3 {
  font-size: 2.15rem;
  font-weight: 800;
  margin-bottom: 18px;
  line-height: 1.3;
}

.why-text p {
  color: var(--text-sub);
  font-size: 1.06rem;
  line-height: 1.72;
  margin-bottom: 24px;
}

.why-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.why-list-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  color: var(--text-main);
  font-size: 0.98rem;
}

.why-list-item svg {
  color: var(--accent-cyan);
}

/* 动态工业遥测面板 (Visual Dashboard) */
.dashboard-panel {
  background: rgba(10, 15, 26, 0.85);
  border: 1px solid rgba(0, 242, 254, 0.3);
  border-radius: var(--radius-xl);
  padding: 30px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.7), 0 0 35px rgba(0, 242, 254, 0.15);
  position: relative;
  backdrop-filter: blur(20px);
}

.dashboard-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  margin-bottom: 22px;
}

.dashboard-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.98rem;
  font-weight: 800;
  color: var(--text-main);
}

.status-indicator {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--accent-emerald);
  font-weight: 700;
  font-family: var(--font-mono);
}

.status-indicator::before {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--accent-emerald);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent-emerald);
  animation: pulse-dot 1.5s infinite;
}

.speed-meter-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.speed-stat-box {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  padding: 18px 14px;
  text-align: center;
  transition: var(--transition);
}

.speed-stat-box:hover {
  background: rgba(0, 242, 254, 0.05);
  border-color: rgba(0, 242, 254, 0.25);
}

.stat-label {
  font-size: 0.76rem;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 6px;
  font-family: var(--font-mono);
}

.stat-val {
  font-size: 1.55rem;
  font-weight: 900;
  color: #fff;
  font-family: var(--font-mono);
}

.stat-val.highlight {
  color: var(--accent-cyan);
  text-shadow: 0 0 16px rgba(0, 242, 254, 0.5);
}

.live-graph {
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  padding: 20px;
}

.graph-top {
  display: flex;
  justify-content: space-between;
  font-size: 0.84rem;
  color: var(--text-sub);
  margin-bottom: 12px;
  font-family: var(--font-mono);
}

.wave-svg {
  width: 100%;
  height: 64px;
}

/* 终端代码块 (Geek Terminal - Strict_No_Logs_Policy.sh) */
.terminal-window {
  background: rgba(6, 9, 16, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-xl);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.8), 0 0 35px rgba(0, 242, 254, 0.1);
  font-family: var(--font-mono);
  overflow: hidden;
  backdrop-filter: blur(20px);
}

.terminal-header {
  background: rgba(14, 20, 33, 0.95);
  padding: 14px 20px;
  display: flex;
  align-items: center;
  gap: 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.terminal-dots {
  display: flex;
  gap: 7px;
}

.dot-red { width: 11px; height: 11px; border-radius: 50%; background: #ff5f56; box-shadow: 0 0 6px rgba(255,95,86,0.6); }
.dot-yellow { width: 11px; height: 11px; border-radius: 50%; background: #ffbd2e; box-shadow: 0 0 6px rgba(255,189,46,0.6); }
.dot-green { width: 11px; height: 11px; border-radius: 50%; background: #27c93f; box-shadow: 0 0 6px rgba(39,201,63,0.6); }

.terminal-title {
  font-size: 0.84rem;
  color: var(--text-muted);
  flex-grow: 1;
  text-align: center;
}

.terminal-body {
  padding: 26px 22px;
  font-size: 0.88rem;
  line-height: 1.8;
}

.terminal-line {
  margin-bottom: 6px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.term-prompt { color: var(--accent-cyan); font-weight: 700; }
.term-cmd { color: #f1f5f9; font-weight: 600; }
.term-comment { color: #64748b; font-style: italic; }
.term-success { color: var(--accent-emerald); }
.term-cyan { color: var(--accent-cyan); }
.term-warn { color: var(--accent-amber); }

.cursor-blink {
  display: inline-block;
  width: 8px;
  height: 16px;
  background: var(--accent-cyan);
  vertical-align: middle;
  box-shadow: 0 0 8px var(--accent-cyan);
  animation: cursor-blink 1s step-end infinite;
}

@keyframes cursor-blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* --------------------------------------------------------------------------
   用户评价跑马灯区 (Testimonials Marquee Section)
   -------------------------------------------------------------------------- */
.testimonials-section {
  padding: 95px 0;
  overflow: hidden;
  background: radial-gradient(circle at 50% 50%, rgba(0, 242, 254, 0.04) 0%, transparent 70%);
}

.marquee-container {
  width: 100%;
  overflow: hidden;
  position: relative;
  padding: 24px 0;
  mask-image: linear-gradient(to right, transparent 0%, black 12%, black 88%, transparent 100%);
  -webkit-mask-image: linear-gradient(to right, transparent 0%, black 12%, black 88%, transparent 100%);
}

.marquee-track {
  display: flex;
  gap: 26px;
  width: max-content;
  animation: marquee-scroll 45s linear infinite;
}

.marquee-track:hover {
  animation-play-state: paused;
}

@keyframes marquee-scroll {
  from { transform: translateX(0); }
  to { transform: translateX(calc(-50% - 13px)); }
}

.review-card {
  width: 380px;
  background: var(--bg-card);
  border: var(--border-hairline);
  border-radius: var(--radius-lg);
  padding: 30px 26px;
  flex-shrink: 0;
  transition: var(--transition);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(16px);
}

.review-card:hover {
  border-color: var(--border-active);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow-cyan);
}

.review-stars {
  color: #fbbf24;
  font-size: 1.05rem;
  margin-bottom: 14px;
  letter-spacing: 2px;
  text-shadow: 0 0 10px rgba(251, 191, 36, 0.4);
}

.review-text {
  font-size: 0.96rem;
  color: #fff;
  line-height: 1.68;
  margin-bottom: 20px;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--brand-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #040813;
  font-size: 0.95rem;
  box-shadow: 0 0 14px rgba(0, 242, 254, 0.4);
}

.author-name {
  font-weight: 800;
  font-size: 0.96rem;
  color: #fff;
}

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

/* --------------------------------------------------------------------------
   常见问题解答区 (FAQ Section - Native Details/Summary)
   -------------------------------------------------------------------------- */
.faq-section {
  padding: 95px 0;
}

.faq-container {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: var(--border-hairline);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
  backdrop-filter: blur(12px);
}

.faq-item[open] {
  border-color: rgba(0, 242, 254, 0.4);
  background: rgba(16, 24, 40, 0.85);
  box-shadow: 0 0 25px rgba(0, 242, 254, 0.15);
}

.faq-question {
  padding: 22px 26px;
  font-size: 1.08rem;
  font-weight: 700;
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  user-select: none;
  transition: var(--transition);
}

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

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

.faq-icon {
  width: 22px;
  height: 22px;
  color: var(--text-sub);
  transition: transform 0.28s cubic-bezier(0.16, 1, 0.3, 1);
  flex-shrink: 0;
}

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

.faq-answer {
  padding: 0 26px 24px 26px;
  color: var(--text-sub);
  font-size: 0.98rem;
  line-height: 1.72;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 16px;
}

/* --------------------------------------------------------------------------
   底部转化区 (Bottom CTA Section) - 星云脉冲汇聚
   -------------------------------------------------------------------------- */
.bottom-cta-section {
  padding: 70px 0 100px 0;
}

.bottom-cta-card {
  background: linear-gradient(135deg, rgba(16, 25, 44, 0.92) 0%, rgba(9, 13, 24, 0.95) 100%);
  border: 1px solid rgba(0, 242, 254, 0.35);
  border-radius: var(--radius-xl);
  padding: 68px 40px;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.7), 0 0 60px rgba(0, 242, 254, 0.18);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(20px);
}

.bottom-cta-card::before {
  content: '';
  position: absolute;
  top: -40%;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 500px;
  background: radial-gradient(circle, rgba(0, 242, 254, 0.15) 0%, rgba(99, 102, 241, 0.08) 50%, transparent 75%);
  pointer-events: none;
}

.bottom-cta-card h2 {
  font-size: 2.65rem;
  font-weight: 900;
  margin-bottom: 18px;
}

.bottom-cta-card p {
  font-size: 1.15rem;
  color: var(--text-sub);
  max-width: 720px;
  margin: 0 auto 38px auto;
  line-height: 1.7;
}

.cta-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

/* --------------------------------------------------------------------------
   页脚 (Footer)
   -------------------------------------------------------------------------- */
.site-footer {
  background: #04060b;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 50px 0 40px 0;
  color: var(--text-sub);
}

.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 36px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  flex-wrap: wrap;
  gap: 24px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 800;
  color: #fff;
}

.footer-links-grid {
  display: flex;
  align-items: center;
  gap: 36px;
  flex-wrap: wrap;
}

.footer-link-item {
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--text-sub);
  transition: var(--transition);
}

.footer-link-item:hover {
  color: var(--accent-cyan);
}

.footer-bottom {
  padding-top: 30px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.88rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 16px;
}

/* --------------------------------------------------------------------------
   子页面统一排版样式 (About / Terms / Privacy / Sitemap)
   -------------------------------------------------------------------------- */
.subpage-hero {
  padding-top: 145px;
  padding-bottom: 50px;
  text-align: center;
  background: radial-gradient(circle at 50% 0%, rgba(0, 242, 254, 0.1) 0%, transparent 60%);
}

.subpage-content {
  padding: 40px 0 90px 0;
  max-width: 920px;
  margin: 0 auto;
}

.subpage-card {
  background: var(--bg-card);
  border: var(--border-hairline);
  border-radius: var(--radius-xl);
  padding: 48px;
  margin-bottom: 36px;
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(16px);
}

.subpage-card h2 {
  font-size: 1.6rem;
  font-weight: 800;
  margin-bottom: 16px;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 12px;
}

.subpage-card p {
  color: var(--text-sub);
  font-size: 1.02rem;
  line-height: 1.82;
  margin-bottom: 18px;
}

.subpage-card ul {
  margin-bottom: 24px;
  padding-left: 20px;
  list-style: disc;
  color: var(--text-sub);
  line-height: 1.8;
}

.subpage-card li {
  margin-bottom: 8px;
}

/* --------------------------------------------------------------------------
   推荐资讯 & 深度 SEO 长文专区样式 (Insights & Deep Articles)
   -------------------------------------------------------------------------- */
.insights-layout {
  display: grid;
  grid-template-columns: 290px 1fr;
  gap: 40px;
  align-items: start;
  margin-top: 30px;
}

.insights-sidebar {
  position: sticky;
  top: 96px;
  background: var(--bg-card);
  border: var(--border-hairline);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(16px);
}

.sidebar-title {
  font-size: 1.05rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding-bottom: 12px;
}

.sidebar-menu {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sidebar-link {
  font-size: 0.88rem;
  color: var(--text-sub);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  line-height: 1.4;
  display: block;
}

.sidebar-link:hover {
  background: rgba(0, 242, 254, 0.08);
  color: var(--accent-cyan);
  padding-left: 16px;
}

.sidebar-link.featured-brand {
  color: var(--accent-cyan);
  font-weight: 700;
  border-left: 3px solid var(--accent-cyan);
}

.articles-feed {
  display: flex;
  flex-direction: column;
  gap: 48px;
}

.seo-article-card {
  background: var(--bg-card);
  border: var(--border-hairline);
  border-radius: var(--radius-xl);
  padding: 44px 40px;
  transition: var(--transition);
  position: relative;
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(16px);
}

.seo-article-card:hover {
  border-color: var(--border-active);
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.6), 0 0 30px rgba(0, 242, 254, 0.15);
}

.seo-article-card.brand-spotlight {
  border: 1px solid rgba(0, 242, 254, 0.45);
  background: linear-gradient(170deg, rgba(16, 25, 44, 0.92) 0%, rgba(9, 13, 24, 0.95) 100%);
  box-shadow: 0 0 35px rgba(0, 242, 254, 0.2);
}

.article-header {
  margin-bottom: 24px;
}

.article-category {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--accent-cyan);
  background: rgba(0, 242, 254, 0.08);
  border: 1px solid rgba(0, 242, 254, 0.25);
  padding: 4px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 14px;
}

.article-title {
  font-size: 1.85rem;
  font-weight: 800;
  line-height: 1.35;
  color: #fff;
  margin-bottom: 14px;
  letter-spacing: -0.02em;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.article-body {
  color: var(--text-sub);
  font-size: 1.02rem;
  line-height: 1.85;
}

.article-body h2 {
  font-size: 1.45rem;
  font-weight: 800;
  color: #fff;
  margin: 32px 0 16px 0;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-body h3 {
  font-size: 1.2rem;
  font-weight: 800;
  color: #fff;
  margin: 24px 0 12px 0;
}

.article-body p {
  margin-bottom: 16px;
}

.article-body ul, .article-body ol {
  margin: 16px 0 20px 24px;
  list-style: disc;
}

.article-body li {
  margin-bottom: 8px;
}

.article-callout {
  background: rgba(0, 242, 254, 0.06);
  border-left: 4px solid var(--accent-cyan);
  padding: 18px 22px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
  color: #fff;
  font-size: 0.96rem;
}

.article-callout.tip {
  background: rgba(16, 185, 129, 0.06);
  border-left-color: var(--accent-emerald);
}

.article-table-wrap {
  overflow-x: auto;
  margin: 24px 0;
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  text-align: left;
}

.article-table th {
  background: rgba(255, 255, 255, 0.05);
  padding: 12px 16px;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.1);
  font-weight: 700;
}

.article-table td {
  padding: 12px 16px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--text-sub);
}

.article-table tr:hover td {
  background: rgba(0, 242, 254, 0.04);
}

.article-cta-box {
  background: rgba(10, 15, 26, 0.9);
  border: 1px solid rgba(0, 242, 254, 0.35);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-top: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  box-shadow: 0 0 25px rgba(0, 242, 254, 0.12);
}

.article-cta-text h4 {
  font-size: 1.15rem;
  color: #fff;
  margin-bottom: 4px;
}

.article-cta-text p {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   响应式适配 (Responsive Media Queries)
   -------------------------------------------------------------------------- */
@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(-4px);
  }

  .why-row {
    gap: 36px;
  }

  .insights-layout {
    grid-template-columns: 1fr;
  }

  .insights-sidebar {
    position: relative;
    top: 0;
    margin-bottom: 24px;
  }
}

@media (max-width: 768px) {
  .hero-section {
    padding-top: 130px;
    padding-bottom: 60px;
  }

  .hero-title {
    font-size: 2.35rem;
  }

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

  .hero-cta {
    flex-direction: column;
    width: 100%;
    gap: 14px;
  }

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

  .mobile-toggle {
    display: block;
  }

  .nav-links {
    position: fixed;
    top: 72px;
    left: 0;
    width: 100%;
    background: rgba(6, 9, 16, 0.98);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    flex-direction: column;
    padding: 30px 24px;
    gap: 20px;
    border-bottom: 1px solid rgba(0, 242, 254, 0.25);
    transform: translateY(-150%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.35s ease, opacity 0.35s ease;
  }

  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: auto;
    margin-right: 8px;
  }

  .nav-actions .btn-ghost {
    display: none;
  }

  .nav-actions .btn {
    padding: 6px 14px;
    font-size: 0.84rem;
  }

  .features-grid,
  .streaming-ai-grid,
  .pricing-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .why-row {
    grid-template-columns: 1fr;
    gap: 32px;
    margin-bottom: 56px;
  }

  .why-row.reverse-mobile {
    display: flex;
    flex-direction: column-reverse;
  }

  .speed-meter-grid {
    grid-template-columns: 1fr;
  }

  .bottom-cta-card {
    padding: 44px 20px;
  }

  .bottom-cta-card h2 {
    font-size: 2rem;
  }

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

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

  .footer-top {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-links-grid {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .subpage-card {
    padding: 28px 20px;
  }

  .seo-article-card {
    padding: 28px 18px;
  }

  .article-title {
    font-size: 1.45rem;
  }

  .article-cta-box {
    flex-direction: column;
    align-items: flex-start;
  }

  .article-cta-box .btn {
    width: 100%;
  }
}