/* ============================================
   kuailinnq.com.cn - 全站样式 v2.0
   快连官网 | 全球智能网络加速
   ============================================ */

/* === CSS 变量 === */
:root {
  --primary: #0066ff;
  --primary-dark: #0044cc;
  --primary-light: #4d94ff;
  --accent: #00d4ff;
  --accent-2: #7c3aed;
  --bg: #f0f5ff;
  --bg-white: #ffffff;
  --bg-dark: #0a1628;
  --bg-darker: #060e1c;
  --text: #0a1628;
  --text-secondary: #4a6580;
  --text-muted: #8aa0b8;
  --text-light: rgba(255,255,255,0.85);
  --text-light-muted: rgba(255,255,255,0.55);
  --border: rgba(0, 102, 255, 0.1);
  --border-light: rgba(255,255,255,0.1);
  --shadow-sm: 0 2px 12px rgba(0, 30, 80, 0.06);
  --shadow-md: 0 8px 32px rgba(0, 30, 80, 0.1);
  --shadow-lg: 0 24px 64px rgba(0, 30, 80, 0.14);
  --shadow-glow: 0 0 40px rgba(0, 102, 255, 0.25);
  --radius: 14px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --max-width: 1240px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* === 重置 === */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-dark); }
ul, ol { list-style: none; }
button { cursor: pointer; font-family: inherit; border: none; background: none; }
::selection { background: rgba(0,102,255,0.2); color: var(--text); }

/* === 通用容器 === */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 28px; }
.section { padding: 96px 0; position: relative; overflow: hidden; }
.section-alt { background: var(--bg-white); }
.section-dark { background: var(--bg-dark); color: var(--text-light); }
.section-dark .section-title { color: #fff; }
.section-dark .section-subtitle { color: var(--text-light-muted); }

/* 装饰背景 */
.section-bg-img {
  position: absolute; inset: 0; z-index: 0;
  background-size: cover; background-position: center; opacity: 0.06;
}
.section-glow {
  position: absolute; border-radius: 50%; filter: blur(80px); opacity: 0.4; z-index: 0;
  pointer-events: none;
}

.section-title {
  font-size: 2.2rem; font-weight: 900; text-align: center;
  margin-bottom: 14px; color: var(--text); letter-spacing: -0.8px;
  position: relative; z-index: 1;
}
.section-title .grad {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.section-subtitle {
  text-align: center; color: var(--text-secondary); font-size: 1.08rem;
  max-width: 660px; margin: 0 auto 56px; position: relative; z-index: 1;
}
.text-center { text-align: center; }

/* === 按钮 === */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 34px; border-radius: 50px; font-weight: 700;
  font-size: 0.95rem; transition: all var(--transition); cursor: pointer;
  white-space: nowrap; border: 2px solid transparent; position: relative; overflow: hidden;
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff; box-shadow: 0 6px 24px rgba(0, 102, 255, 0.35);
}
.btn-primary:hover {
  color: #fff; transform: translateY(-3px);
  box-shadow: 0 12px 36px rgba(0, 102, 255, 0.45);
}
.btn-primary::after {
  content:''; position:absolute; top:0; left:-100%; width:100%; height:100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s;
}
.btn-primary:hover::after { left: 100%; }
.btn-outline {
  border-color: var(--primary); color: var(--primary); background: transparent;
}
.btn-outline:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }
.btn-ghost {
  color: var(--text-secondary); background: rgba(0, 102, 255, 0.07);
}
.btn-ghost:hover { background: rgba(0, 102, 255, 0.14); color: var(--primary); }
.btn-light {
  background: #fff; color: var(--primary); box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}
.btn-light:hover { color: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 8px 30px rgba(0,0,0,0.2); }
.btn-lg { padding: 16px 44px; font-size: 1.05rem; }
.btn-sm { padding: 9px 22px; font-size: 0.85rem; }

/* === 导航栏 === */
.navbar {
  position: sticky; top: 0; z-index: 1000;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border); padding: 14px 0;
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.logo {
  display: flex; align-items: center; gap: 10px; font-weight: 900;
  font-size: 1.55rem; color: var(--text); letter-spacing: -0.8px;
}
.logo:hover { color: var(--text); }
.logo-dot {
  width: 38px; height: 38px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 11px; display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 1.15rem; font-weight: 900;
  box-shadow: 0 4px 14px rgba(0,102,255,0.35);
}
.nav-links { display: flex; gap: 30px; align-items: center; flex-wrap: wrap; }
.nav-links a {
  font-weight: 600; color: var(--text-secondary); font-size: 0.93rem;
  position: relative; padding: 4px 0;
}
.nav-links a::after {
  content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transition: width var(--transition); border-radius: 2px;
}
.nav-links a:hover { color: var(--primary); }
.nav-links a:hover::after { width: 100%; }
.nav-cta { display: flex; gap: 12px; align-items: center; }

/* === Hero 区 === */
.hero {
  position: relative; padding: 90px 0 110px; overflow: hidden;
  background: linear-gradient(180deg, #e8f0ff 0%, var(--bg) 100%);
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background-image: url('../img/hero-network.jpg');
  background-size: cover; background-position: center; opacity: 0.12;
}
.hero-bg-overlay {
  position: absolute; inset: 0; z-index: 0;
  background: radial-gradient(ellipse at 30% 50%, rgba(0,102,255,0.08), transparent 60%),
              radial-gradient(ellipse at 80% 20%, rgba(0,212,255,0.06), transparent 50%);
}
.hero-grid {
  display: grid; grid-template-columns: 1.05fr 1fr; gap: 64px;
  align-items: center; position: relative; z-index: 1;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(0, 102, 255, 0.08); border: 1px solid rgba(0, 102, 255, 0.18);
  border-radius: 50px; padding: 7px 20px; font-size: 0.82rem; font-weight: 700;
  color: var(--primary); margin-bottom: 22px;
}
.hero-badge .pulse {
  width: 8px; height: 8px; background: #00cc66; border-radius: 50%;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(0,204,102,0.5); }
  50% { box-shadow: 0 0 0 8px rgba(0,204,102,0); }
}
.hero h1 {
  font-size: 3.3rem; font-weight: 900; line-height: 1.12;
  letter-spacing: -1.5px; margin-bottom: 22px; color: var(--text);
}
.hero h1 .highlight {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero-desc {
  font-size: 1.12rem; color: var(--text-secondary); margin-bottom: 36px;
  max-width: 540px; line-height: 1.8;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 40px; }
.hero-stats { display: flex; gap: 36px; flex-wrap: wrap; }
.hero-stat-num {
  font-size: 2rem; font-weight: 900;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero-stat-label { font-size: 0.85rem; color: var(--text-muted); margin-top: 2px; }

.hero-visual { position: relative; }
.hero-visual img {
  border-radius: var(--radius-lg); box-shadow: var(--shadow-lg);
  width: 100%; border: 1px solid var(--border);
}
.hero-float-card {
  position: absolute; background: rgba(255,255,255,0.95); backdrop-filter: blur(12px);
  border-radius: var(--radius); padding: 14px 20px; box-shadow: var(--shadow-md);
  display: flex; align-items: center; gap: 12px; border: 1px solid var(--border);
  animation: float 4s ease-in-out infinite;
}
.hero-float-card:nth-child(2) { animation-delay: -2s; }
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}
.hero-float-card .icon {
  width: 42px; height: 42px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 11px; display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 1.1rem; flex-shrink: 0;
}
.hero-float-card .fc-title { font-weight: 800; font-size: 0.9rem; }
.hero-float-card .fc-sub { font-size: 0.76rem; color: var(--text-muted); }

/* === 特性卡片网格 === */
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; position: relative; z-index: 1; }
.feature-card {
  background: var(--bg-white); border-radius: var(--radius-lg); padding: 38px 30px;
  border: 1px solid var(--border); transition: all var(--transition); position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: scaleX(0); transform-origin: left; transition: transform var(--transition);
}
.feature-card:hover {
  transform: translateY(-6px); box-shadow: var(--shadow-lg);
  border-color: rgba(0,102,255,0.2);
}
.feature-card:hover::before { transform: scaleX(1); }
.feature-icon {
  width: 60px; height: 60px;
  background: linear-gradient(135deg, rgba(0,102,255,0.12), rgba(0,212,255,0.12));
  border-radius: 16px; display: flex; align-items: center; justify-content: center;
  font-size: 1.6rem; color: var(--primary); margin-bottom: 22px;
  transition: all var(--transition);
}
.feature-card:hover .feature-icon {
  background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff;
  transform: scale(1.08) rotate(-5deg);
}
.feature-card h3 { font-size: 1.22rem; font-weight: 800; margin-bottom: 12px; color: var(--text); }
.feature-card p { color: var(--text-secondary); font-size: 0.93rem; line-height: 1.7; }

/* === 价格卡片 === */
.pricing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; align-items: stretch; position: relative; z-index: 1; }
.price-card {
  background: var(--bg-white); border-radius: var(--radius-lg); padding: 42px 34px;
  border: 2px solid var(--border); display: flex; flex-direction: column;
  transition: all var(--transition); position: relative;
}
.price-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.price-card.featured {
  border-color: transparent;
  background: linear-gradient(180deg, #fff 0%, #f0f6ff 100%);
  box-shadow: var(--shadow-lg); transform: scale(1.04);
  border: 2px solid transparent;
  background-clip: padding-box;
}
.price-card.featured::before {
  content: ''; position: absolute; inset: -2px; border-radius: calc(var(--radius-lg) + 2px);
  background: linear-gradient(135deg, var(--primary), var(--accent)); z-index: -1;
}
.price-badge {
  position: absolute; top: -14px; left: 50%; transform: translateX(-50%);
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff; padding: 5px 20px; border-radius: 30px; font-size: 0.78rem; font-weight: 800;
  box-shadow: 0 4px 14px rgba(0,102,255,0.35);
}
.price-name { font-size: 1.25rem; font-weight: 800; margin-bottom: 8px; color: var(--text); }
.price-desc { font-size: 0.88rem; color: var(--text-muted); margin-bottom: 26px; }
.price-amount { font-size: 3rem; font-weight: 900; color: var(--text); margin-bottom: 4px; letter-spacing: -2px; }
.price-amount .currency { font-size: 1.3rem; vertical-align: top; margin-right: 4px; font-weight: 700; }
.price-amount .period { font-size: 0.92rem; color: var(--text-muted); font-weight: 500; }
.price-features { margin: 30px 0; flex: 1; }
.price-features li {
  padding: 9px 0; font-size: 0.9rem; color: var(--text-secondary);
  display: flex; align-items: center; gap: 10px;
}
.price-features li i { color: var(--primary); font-size: 0.85rem; background: rgba(0,102,255,0.1); width: 20px; height: 20px; border-radius: 50%; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.price-card .btn { width: 100%; justify-content: center; }

/* === 下载平台 === */
.download-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; position: relative; z-index: 1; }
.download-card {
  background: var(--bg-white); border-radius: var(--radius-lg); padding: 36px 26px;
  text-align: center; border: 1px solid var(--border); transition: all var(--transition);
  position: relative; overflow: hidden;
}
.download-card::after {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: scaleX(0); transition: transform var(--transition);
}
.download-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.download-card:hover::after { transform: scaleX(1); }
.download-icon {
  width: 70px; height: 70px; margin: 0 auto 18px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 20px; display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 2rem; box-shadow: 0 8px 24px rgba(0,102,255,0.3);
}
.download-card h3 { font-size: 1.12rem; font-weight: 800; margin-bottom: 6px; }
.download-card .ver { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 18px; }
.download-card .btn { width: 100%; justify-content: center; }

/* === 评价卡片 === */
.reviews-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; position: relative; z-index: 1; }
.review-card {
  background: var(--bg-white); border-radius: var(--radius-lg); padding: 34px 30px;
  border: 1px solid var(--border); transition: all var(--transition); position: relative;
}
.review-card::before {
  content: '\201C'; position: absolute; top: 10px; right: 24px;
  font-size: 4rem; color: rgba(0,102,255,0.08); font-family: Georgia, serif; line-height: 1;
}
.review-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.review-stars { color: #ffb800; margin-bottom: 14px; font-size: 0.9rem; }
.review-text {
  color: var(--text-secondary); font-size: 0.93rem; line-height: 1.75;
  margin-bottom: 22px; font-style: italic; position: relative; z-index: 1;
}
.review-author { display: flex; align-items: center; gap: 12px; }
.review-avatar {
  width: 46px; height: 46px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 800; font-size: 1.05rem; flex-shrink: 0;
}
.review-name { font-weight: 800; font-size: 0.93rem; }
.review-role { font-size: 0.78rem; color: var(--text-muted); }

/* === FAQ === */
.faq-list { max-width: 820px; margin: 0 auto; position: relative; z-index: 1; }
.faq-item {
  background: var(--bg-white); border-radius: var(--radius); margin-bottom: 14px;
  border: 1px solid var(--border); overflow: hidden; transition: all var(--transition);
}
.faq-item:hover { border-color: rgba(0,102,255,0.2); }
.faq-item.open { box-shadow: var(--shadow-sm); border-color: rgba(0,102,255,0.25); }
.faq-question {
  width: 100%; padding: 22px 26px; display: flex; justify-content: space-between;
  align-items: center; font-weight: 700; font-size: 1.02rem; color: var(--text);
  text-align: left; cursor: pointer;
}
.faq-question i {
  color: var(--primary); transition: transform var(--transition); flex-shrink: 0;
  margin-left: 14px; width: 28px; height: 28px; background: rgba(0,102,255,0.08);
  border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 0.8rem;
}
.faq-item.open .faq-question i { transform: rotate(180deg); background: var(--primary); color: #fff; }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.4s ease; }
.faq-item.open .faq-answer { max-height: 600px; }
.faq-answer-inner { padding: 0 26px 22px; color: var(--text-secondary); font-size: 0.93rem; line-height: 1.75; }

/* === 博客 === */
.blog-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; position: relative; z-index: 1; }
.blog-card {
  background: var(--bg-white); border-radius: var(--radius-lg); overflow: hidden;
  border: 1px solid var(--border); transition: all var(--transition);
  display: flex; flex-direction: column;
}
.blog-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.blog-thumb {
  height: 190px; position: relative; overflow: hidden;
  background-size: cover; background-position: center;
}
.blog-thumb::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(0,0,0,0.3) 100%);
}
.blog-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s; }
.blog-card:hover .blog-thumb img { transform: scale(1.08); }
.blog-cat {
  position: absolute; top: 16px; left: 16px;
  background: rgba(255,255,255,0.95); backdrop-filter: blur(8px);
  color: var(--primary); padding: 5px 14px; border-radius: 30px;
  font-size: 0.75rem; font-weight: 800; z-index: 2;
}
.blog-body { padding: 26px; flex: 1; display: flex; flex-direction: column; }
.blog-meta { display: flex; gap: 18px; font-size: 0.8rem; color: var(--text-muted); margin-bottom: 12px; }
.blog-card h3 { font-size: 1.12rem; font-weight: 800; margin-bottom: 12px; line-height: 1.45; color: var(--text); }
.blog-card h3 a { color: var(--text); }
.blog-card h3 a:hover { color: var(--primary); }
.blog-excerpt { color: var(--text-secondary); font-size: 0.88rem; line-height: 1.65; margin-bottom: 18px; flex: 1; }
.blog-readmore { font-weight: 700; font-size: 0.88rem; color: var(--primary); display: inline-flex; align-items: center; gap: 6px; }
.blog-readmore i { transition: transform var(--transition); }
.blog-readmore:hover i { transform: translateX(4px); }

/* 博客文章页 */
.article-header { padding: 70px 0 50px; text-align: center; position: relative; overflow: hidden;
  background: linear-gradient(180deg, #e8f0ff 0%, var(--bg) 100%); }
.article-cat {
  display: inline-block; background: rgba(0,102,255,0.1); color: var(--primary);
  padding: 5px 16px; border-radius: 30px; font-size: 0.8rem; font-weight: 700; margin-bottom: 18px;
}
.article-header h1 { font-size: 2.3rem; font-weight: 900; max-width: 760px; margin: 0 auto 18px; line-height: 1.3; letter-spacing: -0.8px; }
.article-meta { display: flex; justify-content: center; gap: 26px; font-size: 0.88rem; color: var(--text-muted); flex-wrap: wrap; }
.article-body { max-width: 780px; margin: 0 auto; padding: 50px 28px 70px; }
.article-body h2 {
  font-size: 1.55rem; font-weight: 800; margin: 48px 0 18px; color: var(--text);
  padding-left: 16px; border-left: 4px solid var(--primary); line-height: 1.35;
}
.article-body h3 { font-size: 1.22rem; font-weight: 800; margin: 32px 0 14px; color: var(--text); }
.article-body p { margin-bottom: 18px; color: var(--text-secondary); line-height: 1.85; font-size: 1rem; }
.article-body ul, .article-body ol { margin: 18px 0; padding-left: 26px; }
.article-body li { margin-bottom: 10px; color: var(--text-secondary); line-height: 1.75; }
.article-body ul li::marker { color: var(--primary); }
.article-body blockquote {
  border-left: 4px solid var(--primary); background: rgba(0,102,255,0.05);
  padding: 18px 26px; margin: 28px 0; border-radius: 0 12px 12px 0;
  color: var(--text-secondary); font-style: italic;
}
.article-body code {
  background: rgba(0,102,255,0.08); padding: 2px 8px; border-radius: 5px;
  font-size: 0.88em; color: var(--primary-dark);
}
.article-body table { width: 100%; border-collapse: collapse; margin: 28px 0; font-size: 0.9rem; border-radius: 12px; overflow: hidden; box-shadow: var(--shadow-sm); }
.article-body th, .article-body td { border: 1px solid var(--border); padding: 13px 18px; text-align: left; }
.article-body th { background: rgba(0,102,255,0.07); font-weight: 800; color: var(--text); }
.article-body tr:hover td { background: rgba(0,102,255,0.02); }
.article-author-box {
  background: var(--bg-white); border-radius: var(--radius-lg); padding: 30px;
  margin-top: 56px; display: flex; gap: 22px; align-items: flex-start;
  border: 1px solid var(--border); box-shadow: var(--shadow-sm);
}
.article-author-avatar {
  width: 64px; height: 64px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 900; font-size: 1.4rem; flex-shrink: 0;
}
.article-author-info h4 { font-size: 1.05rem; font-weight: 800; margin-bottom: 4px; }
.article-author-info .role { font-size: 0.82rem; color: var(--primary); font-weight: 700; margin-bottom: 8px; }
.article-author-info p { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.6; }

.related-posts { max-width: 940px; margin: 0 auto; padding: 0 28px 70px; }
.related-posts h3 { font-size: 1.35rem; font-weight: 800; margin-bottom: 28px; text-align: center; }
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.related-card {
  background: var(--bg-white); border-radius: var(--radius); padding: 22px;
  border: 1px solid var(--border); transition: all var(--transition);
}
.related-card:hover { box-shadow: var(--shadow-sm); border-color: rgba(0,102,255,0.2); transform: translateY(-3px); }
.related-card .rc-cat { font-size: 0.75rem; color: var(--primary); font-weight: 700; margin-bottom: 8px; }
.related-card h4 { font-size: 0.95rem; font-weight: 700; line-height: 1.45; }
.related-card h4 a { color: var(--text); }
.related-card h4 a:hover { color: var(--primary); }

/* === 节点/地区 === */
.nodes-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-bottom: 56px; position: relative; z-index: 1; }
.node-stat {
  text-align: center; padding: 32px 22px; background: var(--bg-white);
  border-radius: var(--radius-lg); border: 1px solid var(--border); transition: all var(--transition);
}
.node-stat:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.node-stat .num {
  font-size: 2.4rem; font-weight: 900;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  margin-bottom: 4px;
}
.node-stat .label { font-size: 0.88rem; color: var(--text-muted); }
.regions-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; position: relative; z-index: 1; }
.region-card {
  background: var(--bg-white); border-radius: var(--radius-lg); padding: 28px;
  border: 1px solid var(--border); transition: all var(--transition);
}
.region-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
.region-card h3 { font-size: 1.08rem; font-weight: 800; margin-bottom: 16px; display: flex; align-items: center; gap: 10px; }
.region-card h3 i { color: var(--primary); }
.region-card ul li {
  padding: 7px 0; font-size: 0.88rem; color: var(--text-secondary);
  display: flex; justify-content: space-between; border-bottom: 1px solid rgba(0,102,255,0.05);
}
.region-card ul li:last-child { border-bottom: none; }
.region-card .ping { color: var(--primary); font-weight: 700; font-size: 0.82rem; }

/* === 关于/E-E-A-T === */
.about-hero { padding: 90px 0 70px; text-align: center; position: relative; overflow: hidden;
  background: linear-gradient(180deg, #e8f0ff 0%, var(--bg) 100%); }
.about-hero h1 { font-size: 2.6rem; font-weight: 900; margin-bottom: 16px; letter-spacing: -1px; }
.about-hero p { max-width: 660px; margin: 0 auto; color: var(--text-secondary); font-size: 1.12rem; }
.timeline { max-width: 720px; margin: 0 auto; position: relative; padding-left: 44px; }
.timeline::before { content: ''; position: absolute; left: 14px; top: 8px; bottom: 8px; width: 2px; background: linear-gradient(180deg, var(--primary), var(--accent)); border-radius: 2px; }
.timeline-item { position: relative; margin-bottom: 36px; }
.timeline-item::before {
  content: ''; position: absolute; left: -38px; top: 8px; width: 14px; height: 14px;
  background: var(--primary); border-radius: 50%; border: 3px solid var(--bg);
  box-shadow: 0 0 0 3px rgba(0,102,255,0.2);
}
.timeline-year { font-weight: 900; color: var(--primary); font-size: 1.05rem; margin-bottom: 4px; }
.timeline-title { font-weight: 800; font-size: 1.08rem; margin-bottom: 6px; }
.timeline-desc { color: var(--text-secondary); font-size: 0.92rem; line-height: 1.7; }
.team-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; position: relative; z-index: 1; }
.team-card {
  text-align: center; padding: 32px 22px; background: var(--bg-white);
  border-radius: var(--radius-lg); border: 1px solid var(--border); transition: all var(--transition);
}
.team-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
.team-avatar {
  width: 76px; height: 76px; border-radius: 50%; margin: 0 auto 18px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 900; font-size: 1.6rem; box-shadow: 0 6px 20px rgba(0,102,255,0.3);
}
.team-card h4 { font-size: 1.05rem; font-weight: 800; margin-bottom: 4px; }
.team-card .role { font-size: 0.82rem; color: var(--primary); font-weight: 700; margin-bottom: 10px; }
.team-card p { font-size: 0.82rem; color: var(--text-muted); line-height: 1.55; }

/* === 联系 === */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 48px; align-items: start; position: relative; z-index: 1; }
.contact-info-card {
  background: var(--bg-white); border-radius: var(--radius-lg); padding: 40px;
  border: 1px solid var(--border); box-shadow: var(--shadow-sm);
}
.contact-channel { display: flex; gap: 18px; padding: 22px 0; border-bottom: 1px solid var(--border); }
.contact-channel:last-child { border-bottom: none; }
.contact-channel .ci-icon {
  width: 52px; height: 52px; background: linear-gradient(135deg, rgba(0,102,255,0.1), rgba(0,212,255,0.1));
  border-radius: 14px; display: flex; align-items: center; justify-content: center;
  color: var(--primary); font-size: 1.25rem; flex-shrink: 0;
}
.contact-channel h4 { font-size: 0.98rem; font-weight: 800; margin-bottom: 4px; }
.contact-channel p { font-size: 0.86rem; color: var(--text-secondary); }
.contact-form {
  background: var(--bg-white); border-radius: var(--radius-lg); padding: 40px;
  border: 1px solid var(--border); box-shadow: var(--shadow-sm);
}
.form-group { margin-bottom: 22px; }
.form-group label { display: block; font-weight: 700; font-size: 0.88rem; margin-bottom: 8px; color: var(--text); }
.form-group input, .form-group textarea, .form-group select {
  width: 100%; padding: 13px 18px; border: 1.5px solid var(--border); border-radius: 10px;
  font-size: 0.93rem; font-family: inherit; color: var(--text); background: var(--bg);
  transition: all var(--transition);
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  outline: none; border-color: var(--primary); background: #fff;
  box-shadow: 0 0 0 4px rgba(0,102,255,0.1);
}
.form-group textarea { resize: vertical; min-height: 130px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }

/* === 面包屑 === */
.breadcrumb { padding: 18px 0; font-size: 0.85rem; color: var(--text-muted); }
.breadcrumb a { color: var(--text-secondary); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span { margin: 0 8px; }

/* === CTA 横幅 === */
.cta-banner {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 50%, #003399 100%);
  border-radius: var(--radius-xl); padding: 64px 56px; text-align: center; color: #fff;
  position: relative; overflow: hidden;
}
.cta-banner::before {
  content: ''; position: absolute; top: -60%; right: -10%; width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(0,212,255,0.2), transparent 60%); border-radius: 50%;
}
.cta-banner::after {
  content: ''; position: absolute; bottom: -40%; left: -5%; width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(124,58,237,0.15), transparent 60%); border-radius: 50%;
}
.cta-banner h2 { font-size: 2rem; font-weight: 900; margin-bottom: 14px; position: relative; z-index: 1; }
.cta-banner p { opacity: 0.85; margin-bottom: 32px; position: relative; z-index: 1; font-size: 1.05rem; }
.cta-banner .btn { position: relative; z-index: 1; }

/* === 评分条 === */
.rating-bar { margin-bottom: 22px; }
.rating-bar-header { display: flex; justify-content: space-between; margin-bottom: 8px; }
.rating-bar-label { font-weight: 700; font-size: 0.92rem; }
.rating-bar-value { color: var(--primary); font-weight: 800; font-size: 0.92rem; }
.rating-bar-track { height: 10px; background: rgba(0,102,255,0.08); border-radius: 5px; overflow: hidden; }
.rating-bar-fill { height: 100%; background: linear-gradient(90deg, var(--primary), var(--accent)); border-radius: 5px; transition: width 1s ease; }

/* === Logo 墙/合作伙伴 === */
.logo-wall { display: flex; flex-wrap: wrap; justify-content: center; gap: 40px; align-items: center; opacity: 0.5; }
.logo-wall-item { font-size: 1.3rem; font-weight: 800; color: var(--text-muted); letter-spacing: -0.5px; }

/* === 页脚 === */
.footer {
  background: var(--bg-darker); color: var(--text-light-muted); padding: 70px 0 28px;
  position: relative; overflow: hidden;
}
.footer::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--primary), var(--accent), transparent);
}
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.footer-brand .logo { color: #fff; margin-bottom: 18px; }
.footer-brand p { font-size: 0.88rem; line-height: 1.75; margin-bottom: 20px; color: var(--text-light-muted); }
.footer-social { display: flex; gap: 12px; }
.footer-social a {
  width: 40px; height: 40px; background: rgba(255,255,255,0.08); border-radius: 11px;
  display: flex; align-items: center; justify-content: center; color: var(--text-light);
  font-size: 0.95rem; transition: all var(--transition);
}
.footer-social a:hover { background: var(--primary); color: #fff; transform: translateY(-3px); }
.footer-col h4 { color: #fff; font-size: 0.98rem; font-weight: 800; margin-bottom: 20px; }
.footer-col ul li { margin-bottom: 11px; }
.footer-col a { color: var(--text-light-muted); font-size: 0.88rem; transition: color var(--transition); }
.footer-col a:hover { color: var(--accent); padding-left: 4px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08); padding-top: 26px;
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap;
  gap: 12px; font-size: 0.82rem; color: var(--text-light-muted);
}
.footer-bottom a { color: var(--text-light-muted); }
.footer-bottom a:hover { color: var(--accent); }

/* === 响应式 === */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; gap: 48px; }
  .hero h1 { font-size: 2.6rem; }
  .features-grid, .pricing-grid, .reviews-grid, .blog-grid, .regions-grid { grid-template-columns: 1fr 1fr; }
  .download-grid { grid-template-columns: 1fr 1fr; }
  .nodes-stats { grid-template-columns: 1fr 1fr; }
  .team-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: 1fr; }
  .price-card.featured { transform: none; }
}
@media (max-width: 680px) {
  .section { padding: 64px 0; }
  .section-title { font-size: 1.7rem; }
  .hero { padding: 56px 0 72px; }
  .hero h1 { font-size: 2rem; }
  .hero-stats { gap: 22px; }
  .hero-stat-num { font-size: 1.6rem; }
  .features-grid, .pricing-grid, .reviews-grid, .blog-grid, .regions-grid, .download-grid, .nodes-stats, .team-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .cta-banner { padding: 42px 28px; }
  .cta-banner h2 { font-size: 1.5rem; }
  .article-header h1 { font-size: 1.7rem; }
  .article-body { padding: 36px 20px 56px; }
  .article-body h2 { font-size: 1.3rem; }
  .about-hero h1 { font-size: 2rem; }
}