/* ==========================================================================
   飞星官网 (fxvpn.cyou) - 品牌专属响应式样式表
   ========================================================================== */

:root {
  --bg-dark: #0f172a;
  --bg-card: #1e293b;
  --bg-card-hover: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-cyan: #06b6d4;
  --accent-blue: #3b82f6;
  --accent-gradient: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
  --accent-glow: rgba(6, 182, 212, 0.25);
  --border-color: rgba(255, 255, 255, 0.1);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --transition-normal: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

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

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

a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: var(--transition-normal);
}

a:hover {
  color: #38bdf8;
}

/* 容器与布局 */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header & 导航栏 */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--accent-gradient);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  box-shadow: 0 0 15px var(--accent-glow);
}

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

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: var(--transition-normal);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #fff;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(6, 182, 212, 0.4);
  color: #fff;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
}

/* Hero 头部区 */
.hero {
  padding: 150px 0 80px;
  text-align: center;
  position: relative;
  background: radial-gradient(circle at 50% 20%, rgba(6, 182, 212, 0.15) 0%, transparent 60%);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.3);
  border-radius: 50px;
  color: var(--accent-cyan);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  background: linear-gradient(180deg, #ffffff 0%, #cbd5e1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 750px;
  margin: 0 auto 36px;
}

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-top: 60px;
  padding-top: 40px;
  border-top: 1px solid var(--border-color);
}

.stat-item h3 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

.stat-item p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* 核心特性与优势区 */
.section {
  padding: 80px 0;
}

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

.section-title h2 {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

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

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

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

.feature-card:hover {
  transform: translateY(-5px);
  background: var(--bg-card-hover);
  border-color: rgba(6, 182, 212, 0.4);
}

.feature-icon {
  width: 52px;
  height: 52px;
  background: rgba(6, 182, 212, 0.1);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--accent-cyan);
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
}

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

/* 价格方案区 */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  margin-top: 40px;
}

.pricing-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition-normal);
}

.pricing-card.popular {
  border-color: var(--accent-cyan);
  background: linear-gradient(180deg, rgba(6, 182, 212, 0.08) 0%, var(--bg-card) 100%);
  box-shadow: 0 0 30px rgba(6, 182, 212, 0.15);
}

.popular-badge {
  position: absolute;
  top: -14px;
  right: 24px;
  background: var(--accent-gradient);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 20px;
  text-transform: uppercase;
}

.pricing-card h3 {
  font-size: 1.4rem;
  margin-bottom: 8px;
}

.pricing-card .price {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 16px 0;
}

.pricing-card .price span {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 400;
}

.pricing-features {
  list-style: none;
  margin: 24px 0;
  flex-grow: 1;
}

.pricing-features li {
  margin-bottom: 12px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

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

/* 推荐机场对比表 (Airports Comparison Table) */
.airports-table-wrapper {
  overflow-x: auto;
  margin: 40px 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
}

.airports-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
  min-width: 900px;
}

.airports-table th {
  background: rgba(15, 23, 42, 0.9);
  color: var(--text-primary);
  padding: 18px 16px;
  font-weight: 700;
  border-bottom: 2px solid var(--border-color);
  white-space: nowrap;
}

.airports-table td {
  padding: 16px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
  vertical-align: middle;
}

.airports-table tr:hover {
  background: rgba(255, 255, 255, 0.03);
}

.airports-table tr.highlight-row {
  background: rgba(6, 182, 212, 0.08);
}

.rank-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  font-weight: 700;
  font-size: 0.85rem;
  color: #fff;
  background: #475569;
}

.rank-badge.top1 {
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  box-shadow: 0 0 10px rgba(245, 158, 11, 0.4);
}

.rank-badge.top2 {
  background: linear-gradient(135deg, #94a3b8 0%, #64748b 100%);
}

.rank-badge.top3 {
  background: linear-gradient(135deg, #b45309 0%, #78350f 100%);
}

.code-tag {
  background: rgba(6, 182, 212, 0.15);
  color: var(--accent-cyan);
  font-family: monospace;
  font-weight: 700;
  padding: 4px 8px;
  border-radius: 4px;
  border: 1px dashed rgba(6, 182, 212, 0.4);
  font-size: 0.85rem;
}

/* SEO 文章网格区 */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 24px;
}

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

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

.article-tag {
  display: inline-block;
  background: rgba(59, 130, 246, 0.15);
  color: #60a5fa;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 4px;
  margin-bottom: 12px;
  width: fit-content;
}

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

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

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

.article-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 20px;
  flex-grow: 1;
}

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

/* 用户评价 (Testimonials) */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  padding: 28px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.stars {
  color: #f59e0b;
  font-size: 1.1rem;
  margin-bottom: 12px;
}

.review-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-style: italic;
  margin-bottom: 20px;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
  font-size: 1.1rem;
}

.user-details h4 {
  font-size: 0.95rem;
}

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

/* 常见问题 (FAQ Accordion) */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.faq-question {
  width: 100%;
  padding: 20px 24px;
  text-align: left;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.05rem;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}

.faq-question::after {
  content: "+";
  font-size: 1.4rem;
  color: var(--accent-cyan);
  transition: transform 0.3s ease;
}

.faq-item.active .faq-question::after {
  content: "−";
}

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

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

/* ==========================================================================
   文章详情页排版与样式
   ========================================================================== */

.article-header {
  padding: 130px 0 40px;
  background: radial-gradient(circle at 50% 0%, rgba(6, 182, 212, 0.1) 0%, transparent 60%);
  border-bottom: 1px solid var(--border-color);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.breadcrumb a {
  color: var(--text-secondary);
}

.article-title {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
}

.article-post-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.article-body-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 40px;
  padding: 50px 0;
}

.article-content {
  background: var(--bg-card);
  padding: 40px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  font-size: 1.05rem;
  line-height: 1.8;
  color: #cbd5e1;
}

.article-content h2 {
  font-size: 1.6rem;
  color: var(--text-primary);
  margin: 36px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.article-content h3 {
  font-size: 1.3rem;
  color: var(--text-primary);
  margin: 24px 0 12px;
}

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

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

.article-content li {
  margin-bottom: 8px;
}

.article-content blockquote {
  border-left: 4px solid var(--accent-cyan);
  background: rgba(6, 182, 212, 0.05);
  padding: 16px 20px;
  margin: 24px 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-primary);
  font-style: italic;
}

.cta-box {
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.15) 0%, rgba(59, 130, 246, 0.15) 100%);
  border: 1px solid var(--accent-cyan);
  border-radius: var(--radius-md);
  padding: 28px;
  text-align: center;
  margin: 40px 0;
}

.cta-box h3 {
  font-size: 1.3rem;
  margin-bottom: 10px;
  color: #fff;
}

.cta-box p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

/* 侧边栏与内部链接推荐 */
.sidebar-widget {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  padding: 24px;
  margin-bottom: 24px;
}

.sidebar-widget h4 {
  font-size: 1.1rem;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
}

.related-links {
  list-style: none;
}

.related-links li {
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--border-color);
}

.related-links li:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.related-links a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.4;
  display: block;
}

.related-links a:hover {
  color: var(--accent-cyan);
}

/* ==========================================================================
   页脚 Footer & PBN 友情链接输血管道
   ========================================================================== */

footer {
  background: #090d16;
  border-top: 1px solid var(--border-color);
  padding: 50px 0 30px;
  margin-top: 80px;
  text-align: center;
}

.footer-top {
  margin-bottom: 30px;
}

.footer-brand {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.footer-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  max-width: 500px;
  margin: 0 auto 20px;
}

/* PBN 友情链接专用区域 */
.footer-friend-links {
  margin: 24px auto;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  max-width: 900px;
}

.footer-friend-links-title {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.footer-links-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.footer-links-wrapper a {
  font-size: 0.8rem;
  color: #64748b;
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-links-wrapper a:hover {
  color: var(--accent-cyan);
  text-decoration: underline;
}

.footer-copyright {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 20px;
}

/* ==========================================================================
   响应式适配 (Mobile & Tablet)
   ========================================================================== */

@media (max-width: 992px) {
  .article-body-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.1rem;
  }
  
  .hero p {
    font-size: 1rem;
  }
  
  .hero-stats {
    gap: 20px;
  }
  
  .stat-item h3 {
    font-size: 1.5rem;
  }
  
  .nav-links {
    display: none; /* 移动端简化 */
  }
  
  .article-content {
    padding: 24px 16px;
  }
}