/* ==========================================================================
   速云 (Suyun) - 极速网络代理服务 原生 CSS 样式表
   极简、无依赖、性能优先、商务科技风格 (Business Minimalist Tech)
   ========================================================================== */

/* 1. 全局变量与设计系统 */
:root {
  --bg-dark: #080c14;
  --bg-card: rgba(18, 24, 38, 0.75);
  --bg-card-hover: rgba(28, 37, 58, 0.85);
  --bg-header: rgba(8, 12, 20, 0.88);
  
  --color-primary: #6366f1; /* 电光紫蓝 */
  --color-primary-hover: #4f46e5;
  --color-cyan: #06b6d4; /* 霓虹青 */
  --color-emerald: #10b981; /* 极速绿 */
  --color-pink: #ec4899;
  
  --gradient-primary: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #06b6d4 100%);
  --gradient-card-border: linear-gradient(135deg, rgba(99, 102, 241, 0.3), rgba(6, 182, 212, 0.15));
  --gradient-btn: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);

  --text-main: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-bright: rgba(99, 102, 241, 0.4);
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --shadow-glow: 0 0 25px rgba(99, 102, 241, 0.25);
  --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.5);

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --max-width: 1200px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  font-size: 16px;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* 全局网格星空暗纹背景 */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(99, 102, 241, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 85% 85%, rgba(6, 182, 212, 0.1) 0%, transparent 40%),
    linear-gradient(to right, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 40px 40px, 40px 40px;
  z-index: -1;
  pointer-events: none;
}

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

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* 3. 核心通用组件 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.8rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-btn);
  color: #ffffff;
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(99, 102, 241, 0.6);
  filter: brightness(1.1);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--border-bright);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 1rem 2.2rem;
  font-size: 1.05rem;
  border-radius: var(--radius-md);
}

.btn-block {
  width: 100%;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 500;
  background: rgba(99, 102, 241, 0.12);
  color: #818cf8;
  border: 1px solid rgba(99, 102, 241, 0.25);
}

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

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.section-title {
  text-align: center;
  margin-bottom: 3.5rem;
}

.section-title h2 {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
  background: linear-gradient(135deg, #ffffff 30%, #94a3b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-title p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto;
}

/* 4. 头部导航 Header与导航目录 (Nav Menu) */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-header);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0.9rem 0;
}

.header-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: #ffffff;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--gradient-primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 900;
  box-shadow: 0 0 15px rgba(99, 102, 241, 0.5);
}

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

/* 页眉导航目录 Links */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s ease;
  position: relative;
}

.nav-link:hover {
  color: var(--text-main);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--color-cyan);
  transition: width 0.25s ease;
}

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

.header-cta {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

/* 5. 左右分栏 Hero Section 与动态卡片 */
.hero {
  padding: 4.5rem 0 3.5rem;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-left {
  text-align: left;
}

.hero-left h1 {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1.18;
  margin: 1.25rem 0 1.25rem;
  letter-spacing: -0.03em;
}

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

.hero-left p {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  line-height: 1.65;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

.latency-bar {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  padding: 0.75rem 1.2rem;
  border-radius: var(--radius-md);
  flex-wrap: wrap;
}

.latency-item {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.latency-item strong {
  color: var(--color-emerald);
}

/* 动态 Hero 图卡 */
.hero-right {
  position: relative;
}

.dynamic-card-wrapper {
  position: relative;
  width: 100%;
}

.dynamic-hero-card {
  background: linear-gradient(145deg, rgba(20, 27, 45, 0.9) 0%, rgba(10, 14, 25, 0.95) 100%);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-card), var(--shadow-glow);
  position: relative;
  overflow: hidden;
}

.card-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 1rem;
}

.card-dots {
  display: flex;
  gap: 6px;
}

.card-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dot-red { background: #ef4444; }
.dot-yellow { background: #f59e0b; }
.dot-green { background: #10b981; }

.status-tag {
  font-size: 0.8rem;
  color: var(--color-cyan);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.node-display {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.node-box {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem;
  transition: all 0.3s ease;
  animation: float 4s ease-in-out infinite alternate;
}

.node-box:nth-child(2) { animation-delay: 1s; }
.node-box:nth-child(3) { animation-delay: 2s; }
.node-box:nth-child(4) { animation-delay: 3s; }

@keyframes float {
  0% { transform: translateY(0px); }
  100% { transform: translateY(-6px); }
}

.node-box:hover {
  background: rgba(99, 102, 241, 0.1);
  border-color: var(--border-bright);
}

.node-location {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.node-ping {
  font-size: 0.75rem;
  color: var(--color-emerald);
  font-weight: 600;
}

.node-bar-container {
  height: 4px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 2px;
  margin-top: 0.6rem;
  overflow: hidden;
}

.node-bar-fill {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: 2px;
  animation: pulseBar 2.5s infinite ease-in-out;
}

@keyframes pulseBar {
  0% { width: 40%; }
  50% { width: 90%; }
  100% { width: 40%; }
}

.metric-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(99, 102, 241, 0.08);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: var(--radius-md);
  padding: 0.9rem 1.2rem;
  font-size: 0.88rem;
}

.metric-item strong {
  color: #ffffff;
  font-size: 1rem;
}

/* 6. 产品核心优势 Core Advantages */
.advantages {
  padding: 4rem 0;
}

.card-grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.75rem;
}

.advantage-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  transition: all 0.35s ease;
  position: relative;
  overflow: hidden;
}

.advantage-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity 0.35s ease;
}

.advantage-card:hover {
  transform: translateY(-5px);
  background: var(--bg-card-hover);
  border-color: var(--border-bright);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

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

.card-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: rgba(99, 102, 241, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #818cf8;
  font-size: 1.6rem;
  margin-bottom: 1.5rem;
}

.advantage-card h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--text-main);
}

.advantage-card p {
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.65;
}

/* 7. 流媒体与 AI 支持图卡 */
.support-section {
  padding: 4rem 0;
}

.support-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.support-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
}

.support-header {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 1rem;
}

.support-header h3 {
  font-size: 1.25rem;
  font-weight: 700;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.tag-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 0.95rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--text-main);
  transition: all 0.2s ease;
}

.tag-item:hover {
  background: rgba(99, 102, 241, 0.15);
  border-color: rgba(99, 102, 241, 0.3);
  transform: scale(1.02);
}

/* 8. 价格对比表 Pricing Section */
.pricing {
  padding: 5rem 0 3rem;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  align-items: stretch;
}

.price-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.25rem 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  transition: all 0.3s ease;
}

.price-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-bright);
}

.price-card.popular {
  background: linear-gradient(180deg, rgba(99, 102, 241, 0.15) 0%, rgba(18, 24, 38, 0.92) 100%);
  border: 2px solid var(--color-primary);
  box-shadow: var(--shadow-glow);
}

.popular-badge {
  position: absolute;
  top: -14px;
  right: 20px;
  background: var(--gradient-primary);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.3rem 0.8rem;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.plan-name {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.plan-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  min-height: 2.5em;
}

.price-amount {
  font-size: 2.4rem;
  font-weight: 900;
  color: var(--text-main);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: baseline;
  gap: 0.2rem;
}

.price-amount span {
  font-size: 0.88rem;
  font-weight: 400;
  color: var(--text-secondary);
}

.feature-list {
  list-style: none;
  margin-bottom: 2rem;
  flex-grow: 1;
}

.feature-list li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0.8rem;
}

.feature-list li svg {
  width: 16px;
  height: 16px;
  color: var(--color-emerald);
  flex-shrink: 0;
}

/* 9. SEO 9大文章图卡板块 (SEO Articles Grid Section - 放在价格表下方) */
.seo-articles {
  padding: 4rem 0 5rem;
  background: rgba(99, 102, 241, 0.02);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.article-grid-9 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.75rem;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.article-card:hover {
  transform: translateY(-5px);
  background: var(--bg-card-hover);
  border-color: var(--border-bright);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

.article-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.article-tag {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  background: rgba(99, 102, 241, 0.15);
  color: #a5b4fc;
  border: 1px solid rgba(99, 102, 241, 0.3);
}

.article-date {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.article-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 0.85rem;
  color: var(--text-main);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-cyan);
  transition: gap 0.2s ease;
}

.article-card:hover .article-link {
  gap: 0.7rem;
  color: #38bdf8;
}

/* SEO 文章正文阅读模式样式 */
.article-detail-container {
  max-width: 880px;
  margin: 0 auto;
  padding: 3.5rem 1.25rem 6rem;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 1rem;
}

.article-body-content {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 3rem 2.5rem;
  line-height: 1.8;
}

.article-body-content h2 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--color-cyan);
  margin: 2rem 0 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border-subtle);
}

.article-body-content h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: #e2e8f0;
  margin: 1.5rem 0 0.75rem;
}

.article-body-content p {
  color: #cbd5e1;
  font-size: 1.05rem;
  margin-bottom: 1.25rem;
}

.article-body-content ul, .article-body-content ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
  color: #cbd5e1;
}

.article-body-content li {
  margin-bottom: 0.6rem;
}

/* 首页内链高亮样式 */
.internal-link {
  color: var(--color-cyan);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.internal-link:hover {
  color: #a855f7;
}

.article-callout {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.12) 0%, rgba(6, 182, 212, 0.08) 100%);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-sm);
  padding: 1.25rem 1.5rem;
  margin: 2rem 0;
}

/* 10. 用户评价 Testimonials */
.testimonials {
  padding: 4rem 0;
}

.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.75rem;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.user-meta {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 1rem;
}

.user-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
  font-size: 1.1rem;
}

.user-info h4 {
  font-size: 0.95rem;
  font-weight: 700;
}

.user-info p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.rating {
  color: #f59e0b;
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
}

.testimonial-card blockquote {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 11. 常见问题解答 FAQ */
.faq {
  padding: 4rem 0 6rem;
}

.faq-container {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

details.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.2rem 1.5rem;
  transition: all 0.25s ease;
}

details.faq-item[open] {
  border-color: var(--border-bright);
  background: var(--bg-card-hover);
}

summary {
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-main);
}

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

summary::after {
  content: "+";
  font-size: 1.4rem;
  color: var(--color-primary);
  transition: transform 0.25s ease;
}

details[open] summary::after {
  content: "−";
  transform: rotate(180deg);
}

details.faq-item p {
  margin-top: 1rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.65;
  border-top: 1px solid var(--border-subtle);
  padding-top: 0.8rem;
}

/* 12. 页脚 Footer - 严格保留 4 个标题链接 */
.footer {
  background: rgba(4, 6, 10, 0.95);
  border-top: 1px solid var(--border-subtle);
  padding: 3.5rem 0 2.5rem;
  text-align: center;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2.5rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.footer-link {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-main);
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  transition: all 0.25s ease;
}

.footer-link:hover {
  color: var(--color-cyan);
  background: rgba(99, 102, 241, 0.12);
  border-color: var(--border-bright);
  transform: translateY(-2px);
}

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

/* 13. 移动端响应式适配 */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  
  .hero-left {
    text-align: center;
  }

  .hero-actions {
    justify-content: center;
  }

  .latency-bar {
    justify-content: center;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }

  .hero-left h1 {
    font-size: 2.2rem;
  }
  
  .hero-left p {
    font-size: 1rem;
  }

  .section-title h2 {
    font-size: 1.75rem;
  }

  .footer-nav {
    flex-direction: column;
    gap: 1rem;
  }

  .footer-link {
    width: 100%;
    max-width: 280px;
  }

  .latency-bar {
    gap: 0.8rem;
    font-size: 0.8rem;
  }

  .btn-lg {
    width: 100%;
  }

  .pricing-grid, .article-grid-9 {
    grid-template-columns: 1fr;
  }

  .article-body-content {
    padding: 1.75rem;
  }
}