/* ==========================================================================
   红杏云机场官网 - 纯原生现代极简样式表
   特性：秒开级加载、零外部依赖、响应式无障碍（WCAG AA+）、流畅排版
   ========================================================================== */

:root {
  --primary: #e63946;
  --primary-hover: #d62828;
  --primary-light: rgba(230, 57, 70, 0.12);
  --secondary: #1d3557;
  --accent: #457b9d;
  --accent-light: #a8dadc;
  --bg-main: #0d1117;
  --bg-card: #161b22;
  --bg-card-hover: #1f242c;
  --bg-subtle: #21262d;
  --border-color: #30363d;
  --text-main: #f0f6fc;
  --text-muted: #8b949e;
  --text-bright: #ffffff;
  --success: #2ea043;
  --gold: #f1c40f;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.5);
  --max-width: 1200px;
  --header-height: 72px;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

html {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-main);
  background-color: var(--bg-main);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* 无障碍跳转链接 */
.skip-link {
  position: absolute;
  top: -100px;
  left: 20px;
  background: var(--primary);
  color: var(--text-bright);
  padding: 12px 20px;
  z-index: 9999;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-weight: 600;
  transition: top 0.2s ease;
}
.skip-link:focus {
  top: 15px;
}

/* 锚点防遮挡 */
[id] {
  scroll-margin-top: calc(var(--header-height) + 20px);
}

/* 通用容器 */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* 标题通用 */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-bright);
  line-height: 1.3;
  margin-bottom: 0.8rem;
  font-weight: 700;
}

h1 { font-size: 2.3rem; }
h2 { font-size: 1.8rem; text-align: center; margin-bottom: 1.2rem; }
h3 { font-size: 1.3rem; }
p { margin-bottom: 1rem; color: var(--text-main); }
a { color: var(--accent-light); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--primary); }

/* 按钮规范 (满足 44px 触控要求) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  min-width: 44px;
  padding: 10px 24px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-align: center;
  border: 1px solid transparent;
  transition: all 0.25s ease;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, #b71c1c 100%);
  color: var(--text-bright) !important;
  box-shadow: 0 4px 14px rgba(230, 57, 70, 0.4);
}
.btn-primary:hover, .btn-primary:focus-visible {
  background: linear-gradient(135deg, var(--primary-hover) 0%, #9b111e 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(230, 57, 70, 0.6);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-bright) !important;
  border: 1px solid var(--border-color);
}
.btn-secondary:hover, .btn-secondary:focus-visible {
  background: var(--bg-subtle);
  border-color: var(--accent-light);
  transform: translateY(-2px);
}

.btn-sm {
  min-height: 38px;
  padding: 6px 16px;
  font-size: 0.9rem;
}

.btn-lg {
  min-height: 52px;
  padding: 14px 32px;
  font-size: 1.15rem;
}

/* 页眉与导航 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(13, 17, 23, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  height: var(--header-height);
  display: flex;
  align-items: center;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-bright);
}
.brand-logo span.logo-mark {
  color: var(--primary);
  font-size: 1.6rem;
}

.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 24px;
}
.nav-link {
  color: var(--text-main);
  font-weight: 500;
  padding: 8px 4px;
  position: relative;
}
.nav-link:hover, .nav-link:focus-visible {
  color: var(--primary);
}
.nav-link.active {
  color: var(--primary);
}
.nav-link.highlight {
  color: #ff99a8;
  font-weight: 700;
}

/* 主视觉区 Hero */
.hero-section {
  padding: 80px 0 60px;
  text-align: center;
  background: radial-gradient(circle at 50% 20%, rgba(230, 57, 70, 0.15) 0%, rgba(13, 17, 23, 0) 70%);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 50px;
  background: var(--primary-light);
  border: 1px solid rgba(230, 57, 70, 0.3);
  color: #ff7b88;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-title {
  font-size: 2.8rem;
  max-width: 900px;
  margin: 0 auto 20px;
  letter-spacing: -0.5px;
}
.hero-title .gradient-text {
  background: linear-gradient(135deg, #ffffff 30%, #ff7b88 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--accent-light);
  margin-bottom: 14px;
  font-weight: 500;
}

.hero-intro {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 780px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-cta-group {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 880px;
  margin: 20px auto 0;
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.stat-item .stat-num {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--primary);
  display: block;
}
.stat-item .stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* 通用 Section 头部 */
.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 48px;
}
.section-tag {
  color: var(--primary);
  font-weight: 700;
  text-transform: uppercase;
  font-size: 0.85rem;
  letter-spacing: 1.5px;
  margin-bottom: 8px;
  display: block;
}
.section-subtitle {
  color: var(--text-muted);
  font-size: 1.05rem;
}

/* 核心优势卡片 (3 个图文卡片) */
.features-section {
  padding: 70px 0;
  border-top: 1px solid var(--border-color);
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
}
.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(230, 57, 70, 0.4);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.feature-icon-box {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.7rem;
  margin-bottom: 20px;
}
.feature-card h3 {
  margin-bottom: 12px;
}
.feature-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 16px;
}
.feature-card ul {
  list-style: none;
  margin-top: auto;
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
}
.feature-card ul li {
  font-size: 0.88rem;
  color: var(--accent-light);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* 流媒体与 AI 支持图卡 */
.streaming-ai-section {
  padding: 70px 0;
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}
.media-ai-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}
.media-card {
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px;
}
.media-card-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
}
.media-card-icon {
  font-size: 2rem;
}
.badges-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0;
}
.service-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  padding: 6px 14px;
  border-radius: 50px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-main);
}
.service-pill.hot {
  border-color: var(--primary);
  color: #ff99a8;
}

/* 套餐价格对比表 */
.pricing-section {
  padding: 80px 0;
}
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 40px;
}
.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform 0.3s ease, border-color 0.3s ease;
}
.pricing-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-light);
  box-shadow: var(--shadow-md);
}
.pricing-card.featured {
  border: 2px solid var(--primary);
  background: linear-gradient(180deg, rgba(230, 57, 70, 0.08) 0%, var(--bg-card) 100%);
  transform: scale(1.03);
}
.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-4px);
}
.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary);
  color: var(--text-bright);
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: 50px;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.plan-name {
  font-size: 1.4rem;
  margin-bottom: 8px;
}
.plan-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}
.plan-price {
  margin-bottom: 24px;
  display: flex;
  align-items: baseline;
  gap: 4px;
}
.plan-price .currency {
  font-size: 1.4rem;
  color: var(--primary);
  font-weight: 700;
}
.plan-price .amount {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--text-bright);
  line-height: 1;
}
.plan-price .period {
  color: var(--text-muted);
  font-size: 0.95rem;
}
.plan-features {
  list-style: none;
  margin-bottom: 32px;
  flex-grow: 1;
}
.plan-features li {
  padding: 8px 0;
  border-bottom: 1px dashed var(--border-color);
  font-size: 0.92rem;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-main);
}
.plan-features li::before {
  content: "✓";
  color: var(--success);
  font-weight: 800;
}

/* 套餐明细表格 (保留表格语义、横向安全滚动) */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-top: 30px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
}
.pricing-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 600px;
}
.pricing-table caption {
  padding: 16px;
  font-weight: 700;
  color: var(--accent-light);
  text-align: left;
  caption-side: top;
  border-bottom: 1px solid var(--border-color);
}
.pricing-table th, .pricing-table td {
  padding: 14px 20px;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.92rem;
}
.pricing-table th {
  background: var(--bg-subtle);
  color: var(--text-bright);
  font-weight: 600;
}
.pricing-table tr:hover td {
  background: var(--bg-card-hover);
}

/* 用户评价 */
.reviews-section {
  padding: 70px 0;
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
}
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.review-card {
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  flex-direction: column;
}
.review-stars {
  color: var(--gold);
  font-size: 1.1rem;
  margin-bottom: 12px;
}
.review-quote {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-main);
  margin-bottom: 20px;
  flex-grow: 1;
}
.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
}
.author-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
}
.author-info h4 {
  font-size: 0.95rem;
  margin-bottom: 2px;
}
.author-info span {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* 常见问题解答 FAQ (默认展开 details/summary) */
.faq-section {
  padding: 80px 0;
  border-top: 1px solid var(--border-color);
}
.faq-list {
  max-width: 860px;
  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);
  padding: 0;
  overflow: hidden;
  transition: border-color 0.2s ease;
}
.faq-item[open] {
  border-color: rgba(230, 57, 70, 0.4);
  background: var(--bg-card-hover);
}
.faq-summary {
  padding: 20px 24px;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-bright);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}
.faq-summary::-webkit-details-marker {
  display: none;
}
.faq-summary::after {
  content: "−";
  font-size: 1.5rem;
  color: var(--primary);
  font-weight: bold;
  line-height: 1;
}
.faq-item:not([open]) .faq-summary::after {
  content: "+";
}
.faq-answer {
  padding: 0 24px 20px;
  color: var(--text-main);
  font-size: 0.98rem;
  line-height: 1.7;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  margin-top: 4px;
}
.faq-answer p:last-child {
  margin-bottom: 0;
}

/* 文章正文与科普中心样式 */
.article-header {
  padding: 50px 0 30px;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  background: radial-gradient(circle at 50% 10%, rgba(230, 57, 70, 0.1) 0%, transparent 60%);
}
.breadcrumbs {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}
.breadcrumbs a {
  color: var(--accent-light);
}
.article-meta {
  display: flex;
  justify-content: center;
  gap: 20px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 16px;
}

.article-content {
  max-width: 820px;
  margin: 40px auto 60px;
  padding: 0 20px;
  font-size: 1.05rem;
  line-height: 1.8;
}
.article-content h2 {
  text-align: left;
  margin-top: 40px;
  margin-bottom: 18px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
  color: #ff99a8;
}
.article-content h3 {
  margin-top: 28px;
  margin-bottom: 14px;
}
.article-content ul, .article-content ol {
  margin-left: 24px;
  margin-bottom: 24px;
}
.article-content li {
  margin-bottom: 8px;
}
.article-content blockquote {
  border-left: 4px solid var(--primary);
  background: var(--bg-card);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
  font-style: normal;
  color: var(--accent-light);
}

.article-cta-box {
  background: linear-gradient(135deg, rgba(230, 57, 70, 0.15) 0%, rgba(29, 53, 87, 0.3) 100%);
  border: 1px solid rgba(230, 57, 70, 0.4);
  border-radius: var(--radius-md);
  padding: 32px;
  text-align: center;
  margin: 48px 0;
}
.article-cta-box h3 {
  margin-bottom: 12px;
}

/* 科普文章列表网格 */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin: 40px 0 80px;
}
.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
}
.article-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-light);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.article-card-tag {
  font-size: 0.8rem;
  color: var(--primary);
  font-weight: 700;
  margin-bottom: 10px;
}
.article-card h3 {
  font-size: 1.15rem;
  margin-bottom: 12px;
  line-height: 1.4;
}
.article-card h3 a {
  color: var(--text-bright);
}
.article-card h3 a:hover {
  color: var(--primary);
}
.article-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 18px;
  flex-grow: 1;
}
.article-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border-color);
  padding-top: 14px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* 页脚 (只保留 4 个标题，并在新标签中打开) */
.site-footer {
  background: #080b0e;
  border-top: 1px solid var(--border-color);
  padding: 48px 0 32px;
  margin-top: auto;
}
.footer-links-bar {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 36px;
  flex-wrap: wrap;
  margin-bottom: 28px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
}
.footer-link-item {
  color: var(--text-main);
  font-size: 1.05rem;
  font-weight: 600;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  transition: color 0.2s, background 0.2s;
}
.footer-link-item:hover, .footer-link-item:focus-visible {
  color: var(--primary);
  background: var(--bg-card);
}
.footer-copyright {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ==========================================================================
   响应式断点媒体查询 (@media)
   ========================================================================== */

/* 平板尺寸 (992px 以下) */
@media (max-width: 992px) {
  .hero-title { font-size: 2.3rem; }
  .feature-grid, .pricing-grid, .reviews-grid, .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-4px);
  }
  .media-ai-container {
    grid-template-columns: 1fr;
  }
}

/* 手机端尺寸 (768px 以下 - 完美单栏显示) */
@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }
  .site-header {
    height: auto;
    padding: 12px 0;
  }
  .header-inner {
    flex-direction: column;
    gap: 12px;
  }
  .nav-menu {
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px 18px;
  }
  .hero-section {
    padding: 48px 0 40px;
  }
  .hero-title {
    font-size: 1.85rem;
    line-height: 1.3;
  }
  .hero-subtitle {
    font-size: 1.05rem;
  }
  .hero-intro {
    font-size: 0.95rem;
    margin-bottom: 28px;
  }
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
    max-width: 320px;
    margin-left: auto;
    margin-right: auto;
  }
  .hero-cta-group .btn {
    width: 100%;
  }
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    padding: 16px;
  }
  .stat-item .stat-num {
    font-size: 1.5rem;
  }

  /* 全部网格切换为单栏显示 */
  .feature-grid,
  .pricing-grid,
  .reviews-grid,
  .articles-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .media-card {
    padding: 20px 16px;
  }
  .pricing-card {
    padding: 28px 20px;
  }
  .faq-summary {
    padding: 16px 18px;
    font-size: 1rem;
  }
  .faq-answer {
    padding: 0 18px 16px;
    font-size: 0.92rem;
  }
  .footer-links-bar {
    flex-direction: column;
    gap: 12px;
  }
  .footer-link-item {
    font-size: 1rem;
    display: block;
    text-align: center;
  }
}

/* 超小屏兼容 (360px 及以下) */
@media (max-width: 360px) {
  .hero-title { font-size: 1.6rem; }
  .btn { font-size: 0.9rem; padding: 8px 16px; }
  .hero-stats { grid-template-columns: 1fr; }
}

/* 动效友好适配 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}