/* ==========================================================================
   老头VPN (laotouvpn.cfd) 全局核心样式库
   包含：玻璃拟态、炫彩霓虹、单排横向价格表、适配移动端、优雅PBN页脚
   ========================================================================== */

:root {
  --bg-dark: #080911;
  --bg-card: rgba(18, 22, 40, 0.7);
  --bg-card-hover: rgba(28, 35, 64, 0.85);
  --border-color: rgba(0, 242, 254, 0.15);
  --border-glow: rgba(0, 242, 254, 0.4);
  
  --primary-cyan: #00f2fe;
  --primary-blue: #4facfe;
  --accent-gold: #ffb703;
  --accent-purple: #7928ca;
  --text-main: #f0f4f8;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --max-width: 1280px;
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-family);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(79, 172, 254, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 85% 65%, rgba(121, 40, 202, 0.08) 0%, transparent 40%);
  background-attachment: fixed;
}

/* 鼠标尾翼 Canvas 容器 */
#cursor-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 9999;
}

/* 容器与版心 */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* 导航栏 Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(8, 9, 17, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 0;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-main);
  font-weight: 800;
  font-size: 1.4rem;
  letter-spacing: 0.5px;
}

.logo img {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 2px solid var(--primary-cyan);
  box-shadow: 0 0 12px rgba(0, 242, 254, 0.5);
  object-fit: cover;
}

.logo-text span {
  background: linear-gradient(135deg, var(--primary-cyan), var(--primary-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
  font-size: 0.95rem;
}

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

.btn-nav-recommend {
  background: linear-gradient(135deg, #ff9900, #ff5500);
  color: #fff !important;
  padding: 8px 18px;
  border-radius: 30px;
  font-weight: 600 !important;
  box-shadow: 0 4px 15px rgba(255, 128, 0, 0.3);
}

.btn-nav-recommend:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255, 128, 0, 0.5);
}

.btn-nav-register {
  background: linear-gradient(135deg, var(--primary-cyan), var(--primary-blue));
  color: #000 !important;
  padding: 8px 20px;
  border-radius: 30px;
  font-weight: 700 !important;
  box-shadow: 0 4px 15px rgba(0, 242, 254, 0.3);
}

.btn-nav-register:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 242, 254, 0.6);
}

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

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(0, 242, 254, 0.1);
  border: 1px solid var(--border-color);
  padding: 6px 16px;
  border-radius: 20px;
  color: var(--primary-cyan);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: 3.2rem;
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.hero h1 .highlight {
  background: linear-gradient(135deg, #00f2fe, #4facfe, #9b51e0);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.2rem;
  color: var(--text-muted);
  max-width: 750px;
  margin: 0 auto 36px;
}

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

.btn-cta-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: linear-gradient(135deg, var(--primary-cyan), var(--primary-blue));
  color: #050b14;
  padding: 16px 36px;
  border-radius: 40px;
  font-size: 1.1rem;
  font-weight: 800;
  text-decoration: none;
  box-shadow: 0 8px 30px rgba(0, 242, 254, 0.4);
  transition: var(--transition);
}

.btn-cta-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 12px 40px rgba(0, 242, 254, 0.6);
}

.btn-cta-secondary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(255, 153, 0, 0.15);
  border: 1px solid rgba(255, 153, 0, 0.4);
  color: #ffaa00;
  padding: 16px 32px;
  border-radius: 40px;
  font-size: 1.1rem;
  font-weight: 700;
  text-decoration: none;
  transition: var(--transition);
}

.btn-cta-secondary:hover {
  background: rgba(255, 153, 0, 0.25);
  border-color: #ffaa00;
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(255, 153, 0, 0.4);
}

.hero-avatar-wrap {
  margin-top: 50px;
  position: relative;
  display: inline-block;
}

.hero-avatar {
  width: 220px;
  height: 220px;
  border-radius: 50%;
  border: 4px solid var(--primary-cyan);
  box-shadow: 0 0 50px rgba(0, 242, 254, 0.4), inset 0 0 20px rgba(0, 242, 254, 0.3);
  object-fit: cover;
  animation: float 4s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-12px); }
}

/* 核心优势板块 Features */
.features-section {
  padding: 70px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 50px;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.section-subtitle {
  color: var(--text-muted);
  font-size: 1.05rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 30px;
  backdrop-filter: blur(10px);
  transition: var(--transition);
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glow);
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0, 242, 254, 0.15);
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
  display: inline-block;
}

.feature-card h3 {
  font-size: 1.25rem;
  margin-bottom: 10px;
  color: var(--text-main);
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* 核心：价格列表单排展示 (Horizontal Pricing Row) */
.pricing-section {
  padding: 70px 0;
  background: rgba(0, 0, 0, 0.2);
}

.pricing-row-wrapper {
  overflow-x: auto;
  padding: 10px 5px 30px;
  -webkit-overflow-scrolling: touch;
}

.pricing-row {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: stretch;
  gap: 20px;
  min-width: 1000px; /* 保证单排不被过度挤压，移动端可横向流畅滑动 */
}

.price-card {
  flex: 1;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  transition: var(--transition);
}

.price-card.popular {
  background: rgba(22, 30, 60, 0.9);
  border: 2px solid var(--primary-cyan);
  box-shadow: 0 0 30px rgba(0, 242, 254, 0.25);
  transform: scale(1.03);
}

.popular-badge {
  position: absolute;
  top: -14px;
  right: 20px;
  background: linear-gradient(135deg, var(--primary-cyan), var(--primary-blue));
  color: #000;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 4px 12px;
  border-radius: 12px;
  text-transform: uppercase;
}

.price-card:hover {
  border-color: var(--primary-cyan);
  box-shadow: 0 12px 35px rgba(0, 242, 254, 0.2);
}

.price-header h3 {
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.price-header p {
  color: var(--text-dim);
  font-size: 0.85rem;
  margin-bottom: 20px;
}

.price-amount {
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--primary-cyan);
  margin-bottom: 20px;
}

.price-amount span {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 400;
}

.price-features {
  list-style: none;
  margin-bottom: 24px;
}

.price-features li {
  color: var(--text-muted);
  font-size: 0.9rem;
  padding: 6px 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.price-features li::before {
  content: "✓";
  color: var(--primary-cyan);
  font-weight: bold;
}

.btn-price {
  display: block;
  text-align: center;
  padding: 12px;
  border-radius: var(--radius-md);
  background: rgba(0, 242, 254, 0.12);
  border: 1px solid var(--border-color);
  color: var(--primary-cyan);
  font-weight: 700;
  text-decoration: none;
  transition: var(--transition);
}

.price-card.popular .btn-price,
.btn-price:hover {
  background: linear-gradient(135deg, var(--primary-cyan), var(--primary-blue));
  color: #000;
  border-color: transparent;
}

/* 博客文章聚合 Articles Showcase */
.articles-section {
  padding: 70px 0;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.article-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glow);
  transform: translateY(-4px);
}

.article-tag {
  display: inline-block;
  background: rgba(121, 40, 202, 0.2);
  border: 1px solid rgba(121, 40, 202, 0.4);
  color: #c084fc;
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: 12px;
  margin-bottom: 12px;
  width: fit-content;
}

.article-card h3 {
  font-size: 1.15rem;
  margin-bottom: 12px;
  line-height: 1.4;
}

.article-card h3 a {
  color: var(--text-main);
  text-decoration: none;
  transition: var(--transition);
}

.article-card h3 a:hover {
  color: var(--primary-cyan);
}

.article-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 16px;
  line-height: 1.5;
}

.article-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--text-dim);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 12px;
}

.read-more {
  color: var(--primary-cyan);
  text-decoration: none;
  font-weight: 600;
}

/* 用户评价 Testimonials */
.reviews-section {
  padding: 70px 0;
  background: rgba(0, 0, 0, 0.15);
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.review-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}

.avatar-ph {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-cyan), var(--accent-purple));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  color: #fff;
}

.user-info h4 {
  font-size: 1rem;
  margin-bottom: 2px;
}

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

.rating {
  color: var(--accent-gold);
  font-size: 0.9rem;
  margin-bottom: 10px;
}

.review-text {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

/* 常见问题 FAQ Accordion */
.faq-section {
  padding: 70px 0;
}

.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-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.faq-question {
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

.faq-question::after {
  content: "+";
  font-size: 1.4rem;
  color: var(--primary-cyan);
  transition: var(--transition);
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0 24px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 24px 20px;
}

/* 关键词标签墙 Keyword Tag Wall */
.keywords-section {
  padding: 40px 0;
  text-align: center;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  max-width: 900px;
  margin: 0 auto;
}

.tag-cloud span {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--text-dim);
  font-size: 0.82rem;
  padding: 4px 14px;
  border-radius: 15px;
}

/* 页脚 Footer & PBN 链接 */
footer {
  background: #04050a;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 50px 0 30px;
  font-size: 0.88rem;
  color: var(--text-dim);
  text-align: center;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  color: var(--text-main);
}

.footer-logo img {
  width: 32px;
  height: 32px;
  border-radius: 50%;
}

.footer-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition);
}

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

/* 核心：PBN 权重精准输血管道区 */
.pbn-links-area {
  margin-top: 15px;
  padding-top: 15px;
  border-top: 1px dashed rgba(255, 255, 255, 0.08);
  font-size: 0.82rem;
  color: var(--text-dim);
}

.pbn-links-area p {
  display: inline-block;
  margin-right: 10px;
}

.pbn-link-item {
  color: #718096;
  text-decoration: none;
  margin: 0 10px;
  font-weight: 500;
  transition: var(--transition);
}

.pbn-link-item:hover {
  color: var(--primary-cyan);
  text-decoration: underline;
}

.copyright {
  margin-top: 15px;
  font-size: 0.78rem;
  color: #4a5568;
}

/* 全球节点布局与 8K 极速延迟实测样式 Nodes Section */
.nodes-section {
  padding: 70px 0;
  background: rgba(13, 17, 30, 0.6);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 45px;
}

.metric-box {
  background: rgba(18, 24, 45, 0.8);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 22px 18px;
  text-align: center;
  backdrop-filter: blur(8px);
  transition: var(--transition);
}

.metric-box:hover {
  border-color: var(--primary-cyan);
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(0, 242, 254, 0.15);
}

.metric-number {
  display: block;
  font-size: 2rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--primary-cyan), var(--primary-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 4px;
}

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

.node-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.node-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.node-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--primary-cyan);
  box-shadow: 0 10px 30px rgba(0, 242, 254, 0.2);
  transform: translateY(-4px);
}

.node-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.node-title-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.node-flag {
  font-size: 2.2rem;
}

.node-title-group h4 {
  font-size: 1.05rem;
  color: var(--text-main);
  font-weight: 700;
}

.node-protocol {
  font-size: 0.78rem;
  color: var(--text-dim);
}

.status-indicator {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 12px;
  background: rgba(16, 185, 129, 0.12);
  color: #10b981;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background-color: #10b981;
  border-radius: 50%;
  box-shadow: 0 0 8px #10b981;
  animation: pulse-green 1.8s infinite;
}

@keyframes pulse-green {
  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);
  }
}

.node-body {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.node-metric {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.88rem;
}

.metric-name {
  color: var(--text-dim);
}

.latency-badge {
  font-weight: 800;
  padding: 3px 10px;
  border-radius: 6px;
  font-size: 0.82rem;
}

.latency-badge.ultra-low {
  background: rgba(16, 185, 129, 0.15);
  color: #10b981;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.latency-badge.low {
  background: rgba(0, 242, 254, 0.15);
  color: var(--primary-cyan);
  border: 1px solid rgba(0, 242, 254, 0.3);
}

.unlock-tag {
  color: var(--text-muted);
  font-size: 0.82rem;
  font-weight: 500;
}

.load-bar-wrap {
  flex: 1;
  height: 6px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 3px;
  margin: 0 10px;
  overflow: hidden;
}

.load-bar {
  height: 100%;
  background: linear-gradient(90deg, #10b981, var(--primary-cyan));
  border-radius: 3px;
}

.load-percent {
  color: var(--text-muted);
  font-size: 0.8rem;
  min-width: 32px;
  text-align: right;
}

/* 移动端响应式 Responsive Design */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.2rem;
  }
  .hero p {
    font-size: 1rem;
  }
  .nav-links {
    display: none; /* 简化移动端，专注于转化按钮 */
  }
  .pricing-row {
    min-width: 900px;
  }
  .price-card.popular {
    transform: none;
  }
  .node-cards-grid {
    grid-template-columns: 1fr;
  }
}