/* ==========================================================================
   赔钱机场 - 极致速度与现代化极简设计系统 (Vanilla CSS)
   ========================================================================== */

:root {
  --bg-primary: #0a0c14;
  --bg-secondary: #121524;
  --bg-card: rgba(22, 27, 46, 0.75);
  --bg-card-hover: rgba(30, 37, 64, 0.9);
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --accent-cyan: #00f2fe;
  --accent-blue: #4facfe;
  --accent-purple: #7f00ff;
  --accent-pink: #e100ff;
  --accent-green: #10b981;
  --accent-orange: #f59e0b;
  --border-color: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(0, 242, 254, 0.3);
  --shadow-glow: 0 0 25px rgba(0, 242, 254, 0.15);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-family: var(--font-main);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* 动态背景光晕 */
body::before {
  content: "";
  position: fixed;
  top: -10vw;
  left: -10vw;
  width: 50vw;
  height: 50vw;
  background: radial-gradient(circle, rgba(0, 242, 254, 0.12) 0%, rgba(0,0,0,0) 70%);
  pointer-events: none;
  z-index: 0;
}

body::after {
  content: "";
  position: fixed;
  bottom: -10vw;
  right: -10vw;
  width: 60vw;
  height: 60vw;
  background: radial-gradient(circle, rgba(127, 0, 255, 0.12) 0%, rgba(0,0,0,0) 70%);
  pointer-events: none;
  z-index: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

/* 渐变文字 */
.gradient-text {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple), var(--accent-pink));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.gradient-text-alt {
  background: linear-gradient(135deg, #00f2fe 0%, #4facfe 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* 容器与版心 */
.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* 语义化 Block / Section 划分 */
section {
  padding: 90px 0;
  scroll-margin-top: 80px;
  position: relative;
}

/* 导航栏 */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 76px;
  background: rgba(10, 12, 20, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  display: flex;
  align-items: center;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.4rem;
  font-weight: 800;
  cursor: pointer;
  user-select: none;
  transition: transform var(--transition-fast);
}

.logo:hover {
  transform: scale(1.03);
}

.logo-icon {
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 15px rgba(0, 242, 254, 0.4);
  animation: pulse-glow 3s infinite alternate;
}

@keyframes pulse-glow {
  0% { box-shadow: 0 0 15px rgba(0, 242, 254, 0.4); }
  100% { box-shadow: 0 0 25px rgba(225, 0, 255, 0.6); }
}

.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);
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--accent-cyan);
}

.header-cta-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* 按钮通用基础 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 50px;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: none;
  outline: none;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  color: #fff;
  box-shadow: 0 4px 20px rgba(0, 242, 254, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 242, 254, 0.55);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--text-main);
  backdrop-filter: blur(10px);
}

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

/* 主视觉区 (Hero) */
.hero {
  padding-top: 160px;
  padding-bottom: 100px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(0, 242, 254, 0.08);
  border: 1px solid rgba(0, 242, 254, 0.25);
  border-radius: 50px;
  color: var(--accent-cyan);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.badge-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-green);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent-green);
  animation: blink 1.5s infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -1px;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 36px;
  max-width: 560px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 40px;
}

.hero-stats {
  display: flex;
  gap: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  width: 100%;
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-num {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text-main);
}

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

/* 动态仪表盘/特效卡片 */
.hero-visual {
  position: relative;
}

.visual-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow-glow);
  position: relative;
  overflow: hidden;
}

.node-status-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-color);
}

.node-status-title {
  font-weight: 700;
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.ping-badge {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-green);
  font-size: 0.8rem;
  padding: 4px 10px;
  border-radius: 12px;
  font-weight: 700;
}

.speed-meter-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.meter-box {
  background: rgba(0, 0, 0, 0.3);
  padding: 16px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.meter-val {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--accent-cyan);
}

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

.live-nodes-list {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.node-pill {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.03);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
}

/* 核心优势 (3 Cards) */
.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 56px auto;
}

.section-subtitle {
  color: var(--accent-cyan);
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 8px;
  display: block;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
  background: var(--bg-card-hover);
}

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(0, 242, 254, 0.1), rgba(127, 0, 255, 0.2));
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 20px;
  color: var(--accent-cyan);
}

.feature-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 12px;
}

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

/* 流媒体与 AI 支持区 */
.media-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.media-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  transition: transform var(--transition-normal);
}

.media-card:hover {
  transform: scale(1.04);
  border-color: var(--accent-purple);
}

.media-icon {
  font-size: 2.2rem;
  margin-bottom: 12px;
  display: block;
}

/* 价格对比表 (Pricing) */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
  position: relative;
}

.pricing-card.popular {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 30px rgba(0, 242, 254, 0.2);
  background: rgba(22, 32, 60, 0.85);
  transform: scale(1.03);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  color: #fff;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 4px 14px;
  border-radius: 50px;
  text-transform: uppercase;
}

.plan-name {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.plan-price {
  font-size: 2.4rem;
  font-weight: 900;
  margin-bottom: 4px;
  color: var(--accent-cyan);
}

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

.plan-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.plan-features {
  list-style: none;
  margin-bottom: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.plan-features li {
  font-size: 0.9rem;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.plan-features li::before {
  content: "✓";
  color: var(--accent-green);
  font-weight: 800;
}

/* SEO 文章板块 (15 篇图卡墙) */
.seo-articles-section {
  padding: 90px 0;
  background: rgba(0, 0, 0, 0.2);
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

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

.article-card:hover {
  transform: translateY(-6px);
  border-color: var(--accent-cyan);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
}

.article-tag {
  font-size: 0.75rem;
  color: var(--accent-cyan);
  background: rgba(0, 242, 254, 0.1);
  padding: 4px 10px;
  border-radius: 50px;
  align-self: flex-start;
  margin-bottom: 12px;
  font-weight: 600;
}

.article-title {
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 10px;
  color: var(--text-main);
}

.article-excerpt {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 18px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 12px;
}

/* FAQ 常见问题 */
.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

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

.faq-question {
  font-weight: 700;
  font-size: 1.05rem;
  margin-bottom: 10px;
  color: var(--accent-cyan);
}

.faq-answer {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* 用户评价 */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

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

.review-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #fff;
}

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

.user-stars {
  color: var(--accent-orange);
  font-size: 0.8rem;
}

/* 页脚 (Footer) */
.footer {
  background: #06070c;
  border-top: 1px solid var(--border-color);
  padding: 60px 0 40px 0;
  text-align: center;
}

.footer-nav {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-bottom: 32px;
  list-style: none;
}

.footer-nav-link {
  font-size: 0.95rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: color var(--transition-fast);
}

.footer-nav-link:hover {
  color: var(--accent-cyan);
}

.pbn-links-area {
  margin: 24px 0;
  padding: 16px;
  background: rgba(255, 255, 255, 0.02);
  border-radius: var(--radius-sm);
  display: inline-block;
}

.pbn-links-title {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

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

.pbn-seo-link {
  color: var(--accent-cyan);
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: underline;
  transition: color var(--transition-fast);
}

.pbn-seo-link:hover {
  color: var(--accent-pink);
}

.copyright {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.3);
  margin-top: 16px;
}

/* 右侧悬浮上下翻页箭头组件 */
.floating-nav-arrows {
  position: fixed;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 12px;
  z-index: 999;
}

.arrow-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(18, 21, 36, 0.85);
  border: 1px solid var(--border-color);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  backdrop-filter: blur(10px);
  transition: all var(--transition-normal);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.arrow-btn:hover {
  background: var(--accent-cyan);
  color: #000;
  transform: scale(1.15);
  box-shadow: 0 0 20px rgba(0, 242, 254, 0.6);
}

.arrow-btn:active {
  transform: scale(0.95);
}

/* 文章 & 4大页脚子页面 Pop-up / Modal 模态窗口系统 */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(12px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  padding: 24px;
}

.modal-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  max-width: 900px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  padding: 40px;
  position: relative;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.8);
  transform: translateY(30px);
  transition: transform 0.3s ease;
}

.modal-backdrop.active .modal-box {
  transform: translateY(0);
}

.modal-close-btn {
  position: absolute;
  top: 20px;
  right: 24px;
  font-size: 2rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: color var(--transition-fast);
  line-height: 1;
}

.modal-close-btn:hover {
  color: var(--accent-pink);
}

.article-content {
  line-height: 1.8;
  font-size: 1.05rem;
  color: #d1d5db;
}

.article-content h2 {
  font-size: 1.6rem;
  color: var(--text-main);
  margin: 28px 0 14px 0;
  border-left: 4px solid var(--accent-cyan);
  padding-left: 12px;
}

.article-content h3 {
  font-size: 1.25rem;
  color: var(--accent-cyan);
  margin: 20px 0 10px 0;
}

.article-content p {
  margin-bottom: 16px;
}

.article-cta-box {
  margin: 32px 0;
  padding: 24px;
  background: linear-gradient(135deg, rgba(0, 242, 254, 0.1), rgba(127, 0, 255, 0.15));
  border: 1px solid var(--accent-cyan);
  border-radius: var(--radius-md);
  text-align: center;
}

/* 移动端响应式适配 (@media) */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-content {
    align-items: center;
  }

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

  .features-grid, .reviews-grid, .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .pricing-grid, .media-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .header {
    height: 64px;
  }

  .nav-menu {
    display: none; /* 移动端精简菜单 */
  }

  .hero {
    padding-top: 110px;
    padding-bottom: 60px;
  }

  .hero-title {
    font-size: 2.2rem;
  }

  .features-grid, .pricing-grid, .media-grid, .articles-grid, .faq-grid, .reviews-grid {
    grid-template-columns: 1fr;
  }

  .pricing-card.popular {
    transform: none;
  }

  .floating-nav-arrows {
    right: 12px;
  }

  .arrow-btn {
    width: 38px;
    height: 38px;
  }

  .footer-nav {
    flex-direction: column;
    gap: 16px;
  }

  .modal-box {
    padding: 24px 18px;
  }
}