/* ===================================================================
   快冲云网 (kuaichongyun.sbs) 官方落地页样式表 - 纯原生 CSS (零外部依赖)
   设计理念：企业级高速感、深邃宇宙科技、丝滑交互、秒开性能
   =================================================================== */

:root {
  --bg-primary: #040914;
  --bg-secondary: #081326;
  --bg-card: rgba(13, 26, 48, 0.72);
  --bg-card-hover: rgba(18, 38, 70, 0.88);
  --border-color: rgba(253, 224, 71, 0.16);
  --border-glow: rgba(253, 224, 71, 0.45);
  
  --primary: #fde047;
  --primary-light: #fef08a;
  --primary-dark: #facc15;
  --accent: #fef9c3;
  --accent-cyan: #06b6d4;
  --accent-gold: #fbbf24;
  --accent-green: #10b981;
  --accent-purple: #818cf8;
  
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", Consolas, Monaco, "Liberation Mono", Menlo, monospace;
  
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 30px rgba(253, 224, 71, 0.28);
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::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);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  line-height: 1.65;
  background: var(--bg-primary);
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* 动态背景画布容器 */
#dynamic-canvas-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: 0.85;
}

/* 页面主体内容层 */
.site-wrapper {
  position: relative;
  z-index: 1;
}

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

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

a:hover {
  color: var(--accent);
}

/* 按钮通用规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  font-size: 15px;
  font-weight: 700;
  border-radius: var(--radius-full);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
  white-space: nowrap;
  border: 1px solid transparent;
  line-height: 1.2;
}

.btn-primary {
  background: linear-gradient(135deg, #fffbeb 0%, #fef08a 25%, #fde047 65%, #facc15 100%);
  color: #060e1c;
  font-weight: 800;
  box-shadow: 0 0 22px rgba(253, 224, 71, 0.45);
  border: 1px solid rgba(254, 240, 138, 0.7);
}

.btn-primary:hover {
  transform: translateY(-2px);
  background: linear-gradient(135deg, #ffffff 0%, #fef9c3 30%, #fde047 80%, #f59e0b 100%);
  box-shadow: 0 0 34px rgba(253, 224, 71, 0.85);
  color: #000000;
}

.btn-secondary {
  background: rgba(14, 30, 56, 0.75);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(22, 46, 84, 0.95);
  border-color: var(--primary);
  color: #fff;
  transform: translateY(-2px);
}

.btn-glow {
  background: linear-gradient(135deg, #fffbeb 0%, #fef08a 25%, #fde047 50%, #facc15 75%, #fef9c3 100%);
  background-size: 200% auto;
  color: #060e1c;
  font-weight: 800;
  box-shadow: 0 4px 26px rgba(253, 224, 71, 0.5);
  border: 1px solid rgba(254, 240, 138, 0.85);
  animation: shineGradientYellow 4s linear infinite;
}

@keyframes shineGradientYellow {
  0% { background-position: 0% 50%; box-shadow: 0 4px 24px rgba(253, 224, 71, 0.45); }
  50% { background-position: 100% 50%; box-shadow: 0 6px 36px rgba(253, 224, 71, 0.85); }
  100% { background-position: 0% 50%; box-shadow: 0 4px 24px rgba(253, 224, 71, 0.45); }
}

.btn-glow:hover {
  box-shadow: 0 6px 38px rgba(253, 224, 71, 0.95);
  transform: translateY(-3px) scale(1.02);
  color: #000000;
}

/* ===================================================================
   顶部导航栏 (Header)
   =================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  width: 100%;
  background: rgba(4, 9, 20, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(253, 224, 71, 0.14);
  transition: background var(--transition-fast);
}

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

.brand-logo-link {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-logo-img {
  height: 48px;
  width: auto;
  display: block;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-link {
  color: var(--text-muted);
  font-size: 15px;
  font-weight: 600;
  padding: 6px 0;
  position: relative;
  transition: color var(--transition-fast);
}

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

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
  box-shadow: 0 0 8px var(--primary);
}

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

.mobile-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

/* ===================================================================
   Hero 首屏视觉区
   =================================================================== */
.hero-section {
  padding: 80px 0 60px;
  position: relative;
  text-align: center;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(253, 224, 71, 0.12);
  border: 1px solid rgba(253, 224, 71, 0.4);
  border-radius: var(--radius-full);
  padding: 6px 18px;
  font-size: 13.5px;
  color: #fef08a;
  font-weight: 600;
  margin-bottom: 24px;
  box-shadow: 0 0 18px rgba(253, 224, 71, 0.2);
}

.status-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-green);
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 10px var(--accent-green);
  animation: pulseGreen 2s infinite;
}

@keyframes pulseGreen {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.3); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

.hero-title {
  font-size: clamp(2.4rem, 5.5vw, 4.2rem);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.02em;
  margin-bottom: 22px;
  color: #ffffff;
}

.text-gradient {
  background: linear-gradient(135deg, #ffffff 15%, #fef08a 60%, #fde047 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-ice-yellow {
  color: #fde047;
  background: linear-gradient(135deg, #fffbeb 0%, #fef08a 25%, #fde047 65%, #facc15 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 0 16px rgba(253, 224, 71, 0.45));
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  color: var(--text-muted);
  max-width: 820px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-subtitle strong {
  color: #fff;
  font-weight: 700;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 44px;
  flex-wrap: wrap;
}

.hero-meta-badges {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
  font-size: 13.5px;
  color: var(--text-dim);
}

.hero-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
}

.hero-meta-item span.icon {
  color: var(--accent-green);
  font-weight: bold;
}

/* 实时专线测速看板 */
.hero-latency-ticker {
  margin-top: 48px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(12px);
}

.ticker-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  font-size: 13px;
  color: var(--text-dim);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  padding-bottom: 10px;
}

.ticker-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
}

.ticker-item {
  background: rgba(10, 20, 38, 0.7);
  border: 1px solid rgba(253, 224, 71, 0.15);
  padding: 12px 14px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.ticker-item:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
}

.node-region {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
}

.node-flag {
  font-size: 18px;
}

.node-speed {
  text-align: right;
}

.node-ms {
  font-size: 14px;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent-green);
}

.node-tag {
  font-size: 11px;
  color: var(--text-dim);
  display: block;
}

/* ===================================================================
   板块基础结构 (Section Base)
   =================================================================== */
.section {
  padding: 90px 0;
  position: relative;
}

.section-alt {
  background: rgba(8, 19, 38, 0.45);
  border-top: 1px solid rgba(253, 224, 71, 0.1);
  border-bottom: 1px solid rgba(253, 224, 71, 0.1);
}

.section-head {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
  background: rgba(253, 224, 71, 0.12);
  padding: 4px 14px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(253, 224, 71, 0.3);
}

.section-title {
  font-size: clamp(2rem, 3.8vw, 2.7rem);
  font-weight: 800;
  line-height: 1.25;
  color: #ffffff;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ===================================================================
   核心优势卡片网格 (Features)
   =================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
  backdrop-filter: blur(10px);
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--primary), transparent);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

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

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

.feature-icon-wrapper {
  width: 58px;
  height: 58px;
  border-radius: 16px;
  background: rgba(253, 224, 71, 0.12);
  border: 1px solid rgba(253, 224, 71, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  margin-bottom: 22px;
  color: var(--primary);
  box-shadow: 0 0 18px rgba(253, 224, 71, 0.2);
}

.feature-title {
  font-size: 19px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 12px;
}

.feature-text {
  font-size: 14.5px;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ===================================================================
   价格板块 - 严格同排展示规范 (Pricing Section - STRICT ROW ALIGNMENT)
   桌面端 4 列严格同排显示，移动端自适应
   =================================================================== */
.pricing-section {
  padding: 90px 0;
  position: relative;
}

.pricing-notice-banner {
  background: rgba(253, 224, 71, 0.1);
  border: 1px dashed rgba(253, 224, 71, 0.45);
  border-radius: var(--radius-md);
  padding: 12px 20px;
  text-align: center;
  font-size: 14px;
  color: #fef08a;
  margin-bottom: 34px;
}

/* 核心：价格网格桌面端 4 列同排 */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 22px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
  backdrop-filter: blur(12px);
}

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

/* 爆款推荐高亮卡片 */
.pricing-card.featured {
  background: linear-gradient(180deg, rgba(14, 38, 74, 0.9) 0%, rgba(8, 22, 44, 0.95) 100%);
  border: 2px solid var(--primary);
  box-shadow: 0 0 35px rgba(253, 224, 71, 0.4);
  transform: scale(1.03);
  z-index: 2;
}

.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-6px);
  box-shadow: 0 0 45px rgba(253, 224, 71, 0.65);
}

.card-badge {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #fef08a, #fde047);
  color: #060e1c;
  font-size: 11.5px;
  font-weight: 800;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  letter-spacing: 0.04em;
  white-space: nowrap;
  box-shadow: 0 2px 12px rgba(253, 224, 71, 0.55);
}

.pricing-header {
  text-align: center;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  margin-bottom: 22px;
}

.plan-name {
  font-size: 20px;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 6px;
}

.plan-desc {
  font-size: 12.5px;
  color: var(--text-dim);
  min-height: 36px;
  line-height: 1.45;
}

.price-box {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
  margin: 16px 0 6px;
}

.price-symbol {
  font-size: 22px;
  font-weight: 700;
  color: var(--primary);
}

.price-amount {
  font-size: 44px;
  font-weight: 900;
  color: #ffffff;
  font-family: var(--font-mono);
  letter-spacing: -0.03em;
}

.price-period {
  font-size: 14px;
  color: var(--text-dim);
}

.plan-traffic-pill {
  display: inline-block;
  background: rgba(253, 224, 71, 0.12);
  color: var(--primary);
  border: 1px solid rgba(253, 224, 71, 0.3);
  font-size: 12px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-top: 4px;
}

.pricing-features {
  list-style: none;
  margin-bottom: 28px;
  flex-grow: 1;
}

.pricing-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 13.5px;
  color: var(--text-muted);
  margin-bottom: 12px;
  line-height: 1.5;
}

.pricing-features li span.check {
  color: var(--accent-green);
  font-weight: bold;
  font-size: 15px;
  line-height: 1.3;
}

.pricing-features li strong {
  color: #fff;
}

.pricing-cta {
  width: 100%;
  padding: 13px 0;
  font-size: 15px;
}

/* ===================================================================
   客户端与协议支持 (Clients & Protocols)
   =================================================================== */
.clients-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 18px;
}

.client-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px 16px;
  text-align: center;
  transition: all var(--transition-fast);
}

.client-card:hover {
  transform: translateY(-3px);
  border-color: var(--primary);
}

.client-icon {
  font-size: 34px;
  margin-bottom: 12px;
  display: block;
}

.client-name {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 4px;
}

.client-hint {
  font-size: 12px;
  color: var(--text-dim);
}

/* ===================================================================
   SEO 专栏文章卡片展示 (Articles Showcase)
   =================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 24px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

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

.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12.5px;
  color: var(--text-dim);
  margin-bottom: 12px;
}

.article-tag {
  background: rgba(253, 224, 71, 0.14);
  color: #fde047;
  border: 1px solid rgba(253, 224, 71, 0.35);
  font-weight: 700;
  padding: 3px 12px;
  border-radius: var(--radius-full);
  box-shadow: 0 0 10px rgba(253, 224, 71, 0.15);
}

.article-card-title {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  line-height: 1.45;
  margin-bottom: 12px;
}

.article-card-title a {
  color: #fff;
}

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

.article-excerpt {
  font-size: 13.5px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 18px;
  flex-grow: 1;
}

.article-keywords-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}

.keyword-chip {
  font-size: 11.5px;
  color: var(--text-dim);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.article-read-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 700;
  color: #fde047;
  transition: all var(--transition-fast);
}

.article-read-more:hover {
  color: #fef9c3;
  gap: 10px;
  text-shadow: 0 0 12px rgba(253, 224, 71, 0.6);
}

/* ===================================================================
   用户真实评价 (Testimonials / Reviews)
   =================================================================== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 22px;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  position: relative;
  transition: all var(--transition-fast);
}

.testimonial-card:hover {
  transform: translateY(-3px);
  border-color: var(--primary);
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.user-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, #f59e0b, #fde047);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 800;
  color: #060e1c;
  border: 2px solid rgba(253, 224, 71, 0.6);
}

.user-info h4 {
  font-size: 15.5px;
  font-weight: 700;
  color: #fff;
}

.user-info p {
  font-size: 12.5px;
  color: var(--text-dim);
}

.review-stars {
  color: #f59e0b;
  font-size: 14px;
  margin-bottom: 12px;
  letter-spacing: 2px;
}

.review-quote {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.65;
  font-style: normal;
}

/* ===================================================================
   常见问题手风琴 (FAQ Accordion - 纯原生实现)
   =================================================================== */
.faq-wrapper {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

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

.faq-question {
  width: 100%;
  text-align: left;
  background: transparent;
  border: none;
  padding: 20px 24px;
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-family: inherit;
}

.faq-icon {
  font-size: 20px;
  color: var(--primary);
  transition: transform var(--transition-fast);
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease-out, padding 0.35s ease-out;
  padding: 0 24px;
  color: var(--text-muted);
  font-size: 14.5px;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 400px;
  padding-bottom: 20px;
}

/* ===================================================================
   权威外链推荐 (External Links)
   =================================================================== */
.external-links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.external-link-card {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.external-link-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  background: var(--bg-card-hover);
}

.ext-icon {
  font-size: 24px;
  color: var(--primary);
}

.ext-title {
  font-size: 14.5px;
  font-weight: 700;
  color: #fff;
  display: block;
}

.ext-desc {
  font-size: 12px;
  color: var(--text-dim);
  display: block;
}

/* ===================================================================
   页尾 (Footer)
   =================================================================== */
.site-footer {
  background: #020610;
  border-top: 1px solid rgba(253, 224, 71, 0.14);
  padding: 70px 0 35px;
  font-size: 14px;
  color: var(--text-dim);
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand p {
  margin-top: 14px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--text-muted);
  max-width: 320px;
}

.footer-heading {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 18px;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 13.5px;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 25px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
}

.footer-geo-badge {
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 12px;
}

/* ===================================================================
   响应式断点适配 (Responsive Breakpoints)
   =================================================================== */
@media (max-width: 1080px) {
  /* 当屏幕较小时，价格网格变为 2x2 */
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-6px);
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .header-inner {
    height: 64px;
  }
  .nav-menu {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    width: 100%;
    background: #040914;
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    padding: 20px;
    gap: 16px;
  }
  .nav-menu.open {
    display: flex;
  }
  .mobile-toggle {
    display: block;
  }
  .hero-section {
    padding: 50px 0 40px;
  }
  .hero-latency-ticker {
    padding: 16px;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 440px;
    margin: 0 auto;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}