/* BiuBiu 机场官网 - 2026 赛博极客科技风格 CSS */

:root {
  --bg-main: #060913;
  --bg-secondary: #0b1120;
  --bg-card: rgba(15, 23, 42, 0.75);
  --bg-card-hover: rgba(30, 41, 59, 0.85);
  --border-glow: rgba(6, 182, 212, 0.3);
  --border-muted: rgba(255, 255, 255, 0.08);
  
  --primary-cyan: #06b6d4;
  --primary-emerald: #10b981;
  --primary-gradient: linear-gradient(135deg, #06b6d4 0%, #3b82f6 50%, #8b5cf6 100%);
  --btn-recommend-gradient: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  --accent-glow: 0 0 25px rgba(6, 182, 212, 0.25);
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --radius-xl: 20px;
  --radius-lg: 14px;
  --radius-md: 10px;
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.6;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: 
    radial-gradient(circle at 20% 0%, rgba(6, 182, 212, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 80% 40%, rgba(139, 92, 246, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 50% 100%, rgba(16, 185, 129, 0.08) 0%, transparent 50%),
    #060913;
  background-attachment: fixed;
  overflow-x: hidden;
}

/* 页面暗纹背景网格 */
body::before {
  content: "";
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 50px 50px;
  pointer-events: none;
  z-index: 0;
}

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* 导航栏 Header */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(6, 9, 19, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-muted);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 800;
  font-size: 1.3rem;
  letter-spacing: -0.5px;
}

.brand img {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  box-shadow: 0 0 16px rgba(6, 182, 212, 0.5);
  border: 1px solid rgba(6, 182, 212, 0.4);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  transition: all 0.2s ease;
}

.nav-links a:hover {
  color: var(--primary-cyan);
  text-shadow: 0 0 10px rgba(6, 182, 212, 0.5);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* 按钮通用 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border: none;
}

.btn-primary {
  background: var(--primary-gradient);
  color: #ffffff;
  box-shadow: 0 4px 20px rgba(6, 182, 212, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(6, 182, 212, 0.55);
}

.btn-recommend {
  background: var(--btn-recommend-gradient);
  color: #ffffff;
  box-shadow: 0 4px 18px rgba(245, 158, 11, 0.35);
}

.btn-recommend:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(245, 158, 11, 0.55);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-glow);
  color: var(--text-primary);
}

.btn-outline:hover {
  background: rgba(6, 182, 212, 0.1);
  border-color: var(--primary-cyan);
  color: var(--primary-cyan);
}

/* Hero 英雄区 - 重新设计大牌极客风格 */
.hero {
  padding: 90px 0 60px;
  text-align: center;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 20px;
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.3);
  border-radius: 40px;
  color: var(--primary-cyan);
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 24px;
}

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

@keyframes pulse {
  0% { opacity: 0.4; }
  50% { opacity: 1; }
  100% { opacity: 0.4; }
}

.hero h1 {
  font-size: 3.4rem;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -1px;
  margin-bottom: 24px;
  background: linear-gradient(180deg, #ffffff 0%, #94a3b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero h1 span {
  background: linear-gradient(135deg, #06b6d4 0%, #10b981 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 820px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 50px;
}

/* 实时网络指标面板 Stats Grid (替代之前的白底地址发布卡片) */
.hero-stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-top: 30px;
}

.stat-box {
  background: var(--bg-card);
  border: 1px solid var(--border-muted);
  border-radius: var(--radius-lg);
  padding: 24px 20px;
  text-align: center;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
}

.stat-box:hover {
  border-color: var(--primary-cyan);
  box-shadow: var(--accent-glow);
  transform: translateY(-4px);
}

.stat-number {
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--primary-cyan);
  margin-bottom: 6px;
  font-family: monospace;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 600;
}

/* 通用 Section 基础 */
.section {
  padding: 80px 0;
  border-bottom: 1px solid var(--border-muted);
}

.section-title {
  text-align: center;
  font-size: 2.4rem;
  font-weight: 800;
  margin-bottom: 14px;
  letter-spacing: -0.5px;
}

.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 54px;
}

/* 核心特性 Feature Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-muted);
  border-radius: var(--radius-xl);
  padding: 34px 28px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; width: 100%; height: 3px;
  background: var(--primary-gradient);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: rgba(6, 182, 212, 0.4);
  background: var(--bg-card-hover);
}

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

.feature-icon {
  font-size: 2.2rem;
  margin-bottom: 20px;
  display: inline-block;
}

.feature-card h3 {
  font-size: 1.3rem;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* 套餐价格 Pricing Grid */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-muted);
  border-radius: var(--radius-xl);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s ease;
}

.pricing-card.popular {
  border: 2px solid var(--primary-cyan);
  background: rgba(6, 182, 212, 0.08);
  box-shadow: 0 0 35px rgba(6, 182, 212, 0.15);
  transform: scale(1.04);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary-gradient);
  color: #ffffff;
  font-size: 0.8rem;
  font-weight: 800;
  padding: 4px 16px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  box-shadow: 0 4px 12px rgba(6, 182, 212, 0.4);
}

.pricing-header h3 {
  font-size: 1.45rem;
  margin-bottom: 8px;
}

.pricing-price {
  font-size: 2.5rem;
  font-weight: 900;
  color: #ffffff;
  margin: 18px 0;
  font-family: monospace;
}

.pricing-price span {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 400;
}

.pricing-features {
  list-style: none;
  margin: 20px 0 32px;
  flex-grow: 1;
}

.pricing-features li {
  padding: 9px 0;
  color: var(--text-secondary);
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 12px;
}

.pricing-features li::before {
  content: "⚡";
  font-size: 0.85rem;
  color: var(--primary-cyan);
}

/* 文章 Grid */
.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-muted);
  border-radius: var(--radius-lg);
  padding: 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.3s ease;
}

.article-card:hover {
  transform: translateY(-5px);
  border-color: var(--primary-cyan);
  box-shadow: var(--accent-glow);
}

.article-meta {
  font-size: 0.8rem;
  color: var(--primary-cyan);
  margin-bottom: 12px;
  display: flex;
  gap: 12px;
  font-weight: 600;
}

.article-card h3 {
  font-size: 1.2rem;
  margin-bottom: 14px;
  line-height: 1.45;
}

.article-card h3 a {
  color: var(--text-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

.article-summary {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.6;
  margin-bottom: 20px;
}

.read-more {
  color: var(--primary-cyan);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.read-more:hover {
  color: #60a5fa;
  text-decoration: underline;
}

/* 文章详情页 Styles */
.article-page {
  padding: 50px 0 90px;
}

.article-header {
  margin-bottom: 40px;
  text-align: center;
}

.article-header h1 {
  font-size: 2.4rem;
  font-weight: 900;
  margin-bottom: 18px;
  line-height: 1.3;
}

.article-content {
  background: var(--bg-card);
  border: 1px solid var(--border-muted);
  border-radius: var(--radius-xl);
  padding: 48px;
  max-width: 920px;
  margin: 0 auto;
  font-size: 1.08rem;
  line-height: 1.85;
  color: #cbd5e1;
  backdrop-filter: blur(10px);
}

.article-content h2 {
  color: #ffffff;
  font-size: 1.6rem;
  margin: 36px 0 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-muted);
}

.article-content h3 {
  color: var(--primary-cyan);
  font-size: 1.3rem;
  margin: 24px 0 14px;
}

.article-content p {
  margin-bottom: 20px;
}

.article-content ul, .article-content ol {
  margin: 0 0 24px 28px;
}

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

.article-content a {
  color: var(--primary-cyan);
  text-decoration: underline;
}

.article-cta-box {
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.15) 0%, rgba(139, 92, 246, 0.15) 100%);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  padding: 30px;
  margin: 40px 0;
  text-align: center;
}

.article-navigation {
  max-width: 920px;
  margin: 36px auto 0;
  display: flex;
  justify-content: space-between;
  gap: 20px;
}

/* 用户评价 Testimonials */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-muted);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all 0.3s ease;
}

.review-card:hover {
  border-color: rgba(6, 182, 212, 0.3);
  transform: translateY(-4px);
}

.review-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #fff;
  font-size: 1.1rem;
}

.review-name {
  font-weight: 800;
  font-size: 1.05rem;
}

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

.stars {
  color: #f59e0b;
  margin-bottom: 12px;
  letter-spacing: 2px;
}

.review-text {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* FAQ 手风琴 */
.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-muted);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.3s ease;
}

.faq-item:hover {
  border-color: rgba(6, 182, 212, 0.3);
}

.faq-question {
  padding: 22px 26px;
  font-weight: 800;
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

.faq-question::after {
  content: "✦";
  font-size: 1.2rem;
  color: var(--primary-cyan);
  transition: transform 0.3s ease;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0 26px;
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding: 0 26px 24px;
}

/* Footer & PBN 精准输血区 (核心任务 2) */
footer {
  margin-top: auto;
  background: #04070f;
  border-top: 1px solid var(--border-muted);
  padding: 48px 0 28px;
  color: var(--text-muted);
  font-size: 0.88rem;
  text-align: center;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  color: var(--text-primary);
}

.footer-brand img {
  width: 28px;
  height: 28px;
  border-radius: 6px;
}

/* 核心任务 2: PBN 友链精准输血区域 */
.pbn-links-area {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px dashed rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
  font-size: 0.82rem;
  color: rgba(148, 163, 184, 0.6);
}

.pbn-links-area span {
  font-weight: 500;
}

.pbn-links-area a {
  color: rgba(148, 163, 184, 0.75);
  text-decoration: none;
  font-size: 0.82rem;
  transition: color 0.2s ease;
}

.pbn-links-area a:hover {
  color: var(--primary-cyan);
  text-decoration: underline;
}

/* 响应式 */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.2rem;
  }
  .nav-links {
    display: none;
  }
  .pricing-card.popular {
    transform: none;
  }
  .article-content {
    padding: 24px;
  }
}