/* ==========================================================================
   CN-SANFEN.PRO - 三分机场 · 全球高速网络加速中心 专属设计系统
   Version: 2026.1.0 | 极速响应式 / 暗黑星际美学 / SEO友好架构
   ========================================================================== */

:root {
  /* 品牌核心主色系 (Core Colors) */
  --bg-main: #080a14;
  --bg-card: rgba(18, 22, 44, 0.75);
  --bg-card-hover: rgba(28, 34, 68, 0.85);
  --bg-accent: rgba(99, 102, 241, 0.12);
  
  --primary: #8b5cf6;
  --primary-hover: #7c3aed;
  --primary-glow: rgba(139, 92, 246, 0.45);
  
  --secondary: #06b6d4;
  --secondary-glow: rgba(6, 182, 212, 0.4);
  
  --accent-pink: #ec4899;
  --accent-pink-glow: rgba(236, 72, 153, 0.45);
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --border-subtle: rgba(148, 163, 184, 0.12);
  --border-glow: rgba(139, 92, 246, 0.35);
  --border-card: rgba(168, 85, 247, 0.22);
  
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;

  /* 字体族 */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* 阴影 & 渐变 */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 40px -10px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 35px rgba(139, 92, 246, 0.3);
  --shadow-glow-pink: 0 0 35px rgba(236, 72, 153, 0.35);

  --gradient-aurora: linear-gradient(135deg, #06b6d4 0%, #8b5cf6 50%, #ec4899 100%);
  --gradient-btn: linear-gradient(135deg, #ec4899 0%, #8b5cf6 100%);
  --gradient-btn-hover: linear-gradient(135deg, #f43f5e 0%, #a855f7 100%);
  --gradient-subtle: linear-gradient(180deg, rgba(139, 92, 246, 0.08) 0%, rgba(6, 182, 212, 0.02) 100%);

  /* 基础尺寸 */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --max-width: 1200px;
  --header-height: 72px;
}

/* 基础重置与全局设定 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

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

/* 星云与星光背景动效 */
body::before {
  content: "";
  position: fixed;
  top: -20%;
  left: 20%;
  width: 60vw;
  height: 60vw;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.15) 0%, rgba(6, 182, 212, 0.05) 50%, transparent 70%);
  filter: blur(120px);
  z-index: -2;
  pointer-events: none;
}

body::after {
  content: "";
  position: fixed;
  bottom: -20%;
  right: 10%;
  width: 50vw;
  height: 50vw;
  background: radial-gradient(circle, rgba(236, 72, 153, 0.12) 0%, rgba(139, 92, 246, 0.04) 50%, transparent 70%);
  filter: blur(120px);
  z-index: -2;
  pointer-events: none;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.25s ease;
}

img, svg {
  display: block;
  max-width: 100%;
}

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

/* 文本渐变与排版辅助类 */
.gradient-text {
  background: var(--gradient-aurora);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.gradient-text-pink {
  background: linear-gradient(135deg, #f472b6 0%, #fb7185 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.gradient-text-cyan {
  background: linear-gradient(135deg, #38bdf8 0%, #06b6d4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* 导航条 (Navbar) */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(8, 10, 20, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.nav-logo-icon {
  width: 36px;
  height: 36px;
}

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

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  text-align: center;
  border: 1px solid transparent;
  line-height: 1;
}

.btn-primary {
  background: var(--gradient-btn);
  color: #ffffff;
  padding: 14px 28px;
  font-size: 1rem;
  box-shadow: 0 4px 20px var(--accent-pink-glow);
}

.btn-primary:hover {
  background: var(--gradient-btn-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-pink-glow);
  color: #ffffff;
}

.btn-secondary {
  background: rgba(139, 92, 246, 0.12);
  border: 1px solid rgba(139, 92, 246, 0.35);
  color: #ffffff;
  padding: 14px 28px;
  font-size: 1rem;
}

.btn-secondary:hover {
  background: rgba(139, 92, 246, 0.25);
  border-color: var(--primary);
  transform: translateY(-2px);
  color: #ffffff;
}

.btn-sm {
  padding: 9px 18px;
  font-size: 0.88rem;
}

.btn-block {
  width: 100%;
}

.btn-pulse {
  animation: pulseButton 2.5s infinite;
}

@keyframes pulseButton {
  0% { box-shadow: 0 0 0 0 rgba(236, 72, 153, 0.6); }
  70% { box-shadow: 0 0 0 12px rgba(236, 72, 153, 0); }
  100% { box-shadow: 0 0 0 0 rgba(236, 72, 153, 0); }
}

/* 移动端菜单切换按钮 */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.5rem;
  cursor: pointer;
}

/* 徽章 Badge */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.badge-glow {
  background: rgba(139, 92, 246, 0.12);
  border: 1px solid rgba(139, 92, 246, 0.4);
  color: #c084fc;
  box-shadow: 0 0 15px rgba(139, 92, 246, 0.25);
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--success);
  box-shadow: 0 0 10px var(--success);
  animation: blink 2s infinite;
}

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

/* 英雄首屏 (Hero Section) */
.hero {
  padding: 80px 0 60px;
  text-align: center;
  position: relative;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-top: 24px;
  margin-bottom: 24px;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 780px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 40px;
  font-weight: 400;
}

.hero-cta {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-bottom: 56px;
  flex-wrap: wrap;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 960px;
  margin: 0 auto;
}

.stat-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px 16px;
  backdrop-filter: blur(10px);
}

.stat-number {
  font-size: 2rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 4px;
  font-family: var(--font-mono);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-dim);
  font-weight: 500;
}

/* 实时节点状态条 (Live Status Bar) */
.status-bar-section {
  padding: 20px 0 60px;
}

.status-bar {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  box-shadow: var(--shadow-sm);
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 0.95rem;
}

.status-nodes {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.node-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  background: rgba(255, 255, 255, 0.04);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.node-flag {
  font-size: 1.1rem;
}

.node-ping {
  color: var(--success);
  font-weight: 700;
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

/* 通用区段 (Section General) */
.section {
  padding: 90px 0;
  position: relative;
}

.section-alt {
  background: rgba(14, 18, 38, 0.4);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 60px;
}

.section-tag {
  color: var(--secondary);
  font-size: 0.88rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 12px;
  display: block;
}

.section-title {
  font-size: 2.6rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  line-height: 1.25;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 玻璃拟态卡片 (Glass Cards) */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

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

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: all 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(168, 85, 247, 0.45);
  transform: translateY(-8px);
  box-shadow: 0 20px 40px -15px rgba(139, 92, 246, 0.25);
}

.card-icon {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-md);
  background: rgba(139, 92, 246, 0.15);
  border: 1px solid rgba(139, 92, 246, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  color: #c084fc;
}

.card-title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: #ffffff;
}

.card-desc {
  color: var(--text-muted);
  font-size: 0.98rem;
  line-height: 1.65;
}

/* 节点线路矩阵表 (Node Matrix Table) */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.node-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
}

.node-table th {
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-muted);
  font-weight: 600;
  padding: 18px 24px;
  border-bottom: 1px solid var(--border-subtle);
  white-space: nowrap;
}

.node-table td {
  padding: 18px 24px;
  border-bottom: 1px solid var(--border-subtle);
  vertical-align: middle;
  color: var(--text-main);
  white-space: nowrap;
}

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

.node-table tr:hover td {
  background: rgba(139, 92, 246, 0.05);
}

.tag-badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 600;
}

.tag-iplc {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.tag-netflix {
  background: rgba(239, 68, 68, 0.15);
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.tag-ai {
  background: rgba(6, 182, 212, 0.15);
  color: #22d3ee;
  border: 1px solid rgba(6, 182, 212, 0.3);
}

/* 套餐价格模块 (Pricing Cards) */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.4s ease;
}

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

.pricing-featured {
  background: rgba(30, 27, 75, 0.7);
  border-color: rgba(236, 72, 153, 0.6);
  box-shadow: 0 20px 60px -15px rgba(236, 72, 153, 0.3);
  transform: translateY(-10px);
}

.pricing-featured:hover {
  transform: translateY(-16px);
}

.featured-ribbon {
  position: absolute;
  top: 0;
  right: 28px;
  transform: translateY(-50%);
  background: var(--gradient-btn);
  color: #ffffff;
  padding: 6px 18px;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  box-shadow: 0 4px 15px rgba(236, 72, 153, 0.5);
}

.pricing-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 16px;
  align-self: flex-start;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-muted);
}

.pricing-title {
  font-size: 1.6rem;
  font-weight: 800;
  margin-bottom: 16px;
  color: #ffffff;
}

.pricing-price {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 8px;
}

.price-currency {
  font-size: 1.8rem;
  font-weight: 700;
  color: #ffffff;
}

.price-amount {
  font-size: 3.5rem;
  font-weight: 900;
  color: #ffffff;
  line-height: 1;
  font-family: var(--font-mono);
}

.price-period {
  font-size: 1rem;
  color: var(--text-dim);
  font-weight: 500;
}

.pricing-hint {
  font-size: 0.85rem;
  color: #f472b6;
  font-weight: 600;
  margin-bottom: 28px;
}

.pricing-features {
  list-style: none;
  margin-top: 24px;
  margin-bottom: 36px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: 14px;
  flex-grow: 1;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.95rem;
  color: var(--text-muted);
}

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

.pricing-features .icon-check {
  color: var(--accent-pink);
  font-size: 1.2rem;
  flex-shrink: 0;
}

.pricing-disclaimer {
  text-align: center;
  font-size: 0.88rem;
  color: var(--text-dim);
  margin-top: 36px;
}

/* 客户端支持生态 (Client Ecosystem) */
.client-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.client-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 28px 20px;
  text-align: center;
  transition: all 0.3s ease;
}

.client-card:hover {
  transform: translateY(-6px);
  border-color: var(--primary);
  background: var(--bg-card-hover);
}

.client-icon {
  font-size: 2.5rem;
  margin-bottom: 14px;
  display: inline-block;
}

.client-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.client-platforms {
  font-size: 0.82rem;
  color: var(--text-dim);
  margin-bottom: 14px;
}

.client-features-badge {
  font-size: 0.78rem;
  color: #38bdf8;
  background: rgba(56, 189, 248, 0.1);
  padding: 3px 8px;
  border-radius: 4px;
}

/* 评测与文章导读卡片 (Blog Preview Grid) */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.blog-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 30px;
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
}

.blog-card:hover {
  border-color: rgba(139, 92, 246, 0.5);
  transform: translateY(-6px);
  box-shadow: var(--shadow-glow);
}

.blog-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.82rem;
  color: var(--text-dim);
  margin-bottom: 14px;
}

.blog-tag {
  color: var(--accent-pink);
  font-weight: 700;
}

.blog-title {
  font-size: 1.3rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 14px;
  color: #ffffff;
}

.blog-title a:hover {
  color: var(--accent-pink);
}

.blog-excerpt {
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.blog-readmore {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--secondary);
  font-weight: 600;
  font-size: 0.92rem;
}

.blog-readmore:hover {
  color: #38bdf8;
  gap: 10px;
}

/* 折叠手风琴 FAQ (Details / Summary) */
.faq-list {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all 0.3s ease;
}

.faq-item:hover {
  border-color: rgba(168, 85, 247, 0.45);
}

.faq-item summary {
  padding: 22px 28px;
  cursor: pointer;
  font-size: 1.1rem;
  font-weight: 700;
  display: flex;
  justify-content: space-between;
  align-items: center;
  list-style: none;
  user-select: none;
  color: #ffffff;
}

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

.faq-icon {
  font-size: 1.4rem;
  color: var(--accent-pink);
  transition: transform 0.3s ease;
}

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

.faq-content {
  padding: 0 28px 24px;
  color: var(--text-muted);
  font-size: 0.98rem;
  line-height: 1.7;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 18px;
}

/* 文章详情页专属排版 (Article Layout) */
.article-header {
  padding: 60px 0 40px;
  text-align: center;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-dim);
  margin-bottom: 20px;
}

.breadcrumbs a {
  color: var(--text-muted);
}

.breadcrumbs a:hover {
  color: #ffffff;
}

.article-title {
  font-size: 2.8rem;
  font-weight: 900;
  line-height: 1.25;
  margin-bottom: 24px;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  font-size: 0.9rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.article-container {
  max-width: 860px;
  margin: 0 auto;
  padding: 40px 24px 80px;
}

.article-content {
  font-size: 1.05rem;
  line-height: 1.85;
  color: #cbd5e1;
}

.article-content h2 {
  font-size: 1.85rem;
  font-weight: 800;
  color: #ffffff;
  margin-top: 48px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-subtle);
}

.article-content h3 {
  font-size: 1.4rem;
  font-weight: 700;
  color: #f1f5f9;
  margin-top: 36px;
  margin-bottom: 16px;
}

.article-content p {
  margin-bottom: 24px;
}

.article-content ul, .article-content ol {
  margin-bottom: 24px;
  padding-left: 28px;
}

.article-content li {
  margin-bottom: 10px;
}

.article-content strong {
  color: #ffffff;
}

.article-content code {
  background: rgba(139, 92, 246, 0.15);
  color: #c084fc;
  padding: 3px 8px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.9em;
}

.callout {
  background: rgba(18, 22, 44, 0.85);
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 20px 24px;
  margin: 32px 0;
  border: 1px solid var(--border-card);
  border-left-width: 4px;
}

.callout-success {
  border-left-color: var(--success);
}

.callout-warning {
  border-left-color: var(--warning);
}

.callout-title {
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 8px;
  font-size: 1.05rem;
}

/* 页脚 (Footer) */
.footer {
  background: #05060d;
  border-top: 1px solid var(--border-subtle);
  padding: 70px 0 30px;
  margin-top: 60px;
}

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

.footer-brand p {
  color: var(--text-dim);
  font-size: 0.92rem;
  line-height: 1.6;
  margin-top: 16px;
  max-width: 320px;
}

.footer-col h4 {
  font-size: 1rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 20px;
}

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

.footer-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
}

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

.footer-bottom {
  padding-top: 30px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-dim);
  flex-wrap: wrap;
  gap: 16px;
}

/* 响应式断点适配 (Responsive Design) */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 2.8rem;
  }
  .card-grid, .pricing-grid, .blog-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .card-grid-4, .client-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }
  .navbar .nav-menu {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: #090b17;
    flex-direction: column;
    padding: 24px;
    border-bottom: 1px solid var(--border-card);
    gap: 18px;
  }
  .navbar .nav-menu.show {
    display: flex;
  }
  .menu-toggle {
    display: block;
  }
  .hero-title {
    font-size: 2.2rem;
  }
  .hero-subtitle {
    font-size: 1.05rem;
  }
  .section-title {
    font-size: 2rem;
  }
  .card-grid, .pricing-grid, .blog-grid, .card-grid-4, .client-grid {
    grid-template-columns: 1fr;
  }
  .pricing-featured {
    transform: none;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .article-title {
    font-size: 2rem;
  }
}