/* ==========================================================================
   云图机场加速器官网 - 极简原生高性能样式表 (Pure Native CSS)
   特性: 无外部字体依赖、无第三方JS、秒开加载、全无障碍支持、自适应移动端
   ========================================================================== */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --bg-primary: #0a0f1d;
  --bg-secondary: #111827;
  --bg-card: #162035;
  --bg-card-hover: #1e2c48;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --accent-cyan: #00e5ff;
  --accent-blue: #3b82f6;
  --accent-indigo: #6366f1;
  --accent-green: #10b981;
  --accent-glow: rgba(0, 229, 255, 0.15);
  --border-color: rgba(255, 255, 255, 0.1);
  --border-focus: #00e5ff;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --container-max: 1200px;
  --header-height: 72px;
  --transition-fast: 0.2s ease;
}

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

@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;
  }
}

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

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

/* 无障碍跳转主要内容入口 */
.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  background: var(--accent-cyan);
  color: #000;
  padding: 10px 18px;
  font-weight: 700;
  z-index: 9999;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 16px;
}

/* 键盘可访问焦点样式 */
:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 3px;
}

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

img, svg {
  max-width: 100%;
  height: auto;
  display: block;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 20px;
}

/* 锚点偏移防止页眉遮挡 */
section[id], article[id] {
  scroll-margin-top: calc(var(--header-height) + 20px);
}

/* ==========================================================================
   页眉与导航
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(10, 15, 29, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 20px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 32px;
  height: 32px;
  fill: var(--accent-cyan);
}

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

.nav-link {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 500;
  transition: color var(--transition-fast);
  padding: 8px 4px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.nav-link:hover, .nav-link:focus-visible, .nav-link.active {
  color: var(--accent-cyan);
}

.nav-cta-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* ==========================================================================
   按钮组件 (CTA规范)
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  min-width: 44px;
  padding: 10px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #00e5ff 0%, #3b82f6 100%);
  color: #050b17;
  box-shadow: 0 4px 14px rgba(0, 229, 255, 0.3);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #33ebff 0%, #60a5fa 100%);
  box-shadow: 0 6px 20px rgba(0, 229, 255, 0.45);
  transform: translateY(-1px);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-main);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.25);
}

.btn-lg {
  padding: 14px 32px;
  font-size: 1.05rem;
  font-weight: 700;
  border-radius: var(--radius-md);
}

/* ==========================================================================
   主视觉区 (Hero Section)
   ========================================================================== */
.hero-section {
  padding: 70px 0 60px;
  background: radial-gradient(circle at 50% 20%, rgba(0, 229, 255, 0.08) 0%, transparent 60%);
  text-align: center;
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(0, 229, 255, 0.1);
  border: 1px solid rgba(0, 229, 255, 0.25);
  border-radius: 9999px;
  color: var(--accent-cyan);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.hero-title {
  font-size: 2.75rem;
  line-height: 1.2;
  font-weight: 900;
  margin-bottom: 20px;
  letter-spacing: -0.03em;
}

.hero-title span {
  background: linear-gradient(135deg, #00e5ff 0%, #818cf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  max-width: 760px;
  margin: 0 auto 32px;
  color: var(--text-muted);
  font-size: 1.15rem;
  line-height: 1.7;
}

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

.hero-features-bar {
  display: flex;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  max-width: 900px;
  margin: 0 auto;
}

.feature-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.feature-pill svg {
  width: 18px;
  height: 18px;
  fill: var(--accent-cyan);
}

/* ==========================================================================
   区块通用样式
   ========================================================================== */
.section-pad {
  padding: 80px 0;
}

.section-head {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 48px;
}

.section-tag {
  color: var(--accent-cyan);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.section-title {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 14px;
}

.section-desc {
  color: var(--text-muted);
  font-size: 1rem;
}

/* ==========================================================================
   核心优势 (3个图文卡片)
   ========================================================================== */
.grid-3 {
  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: transform var(--transition-fast), border-color var(--transition-fast);
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 229, 255, 0.4);
  background: var(--bg-card-hover);
}

.feature-card-icon {
  width: 52px;
  height: 52px;
  background: rgba(0, 229, 255, 0.1);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-card-icon svg {
  width: 28px;
  height: 28px;
  fill: var(--accent-cyan);
}

.feature-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

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

/* ==========================================================================
   流媒体与AI支持卡片
   ========================================================================== */
.stream-ai-section {
  background: var(--bg-secondary);
}

.stream-ai-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.stream-group {
  margin-bottom: 24px;
}

.stream-group-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.badge-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.badge-item {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 0.85rem;
  color: var(--text-main);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.badge-item span.dot {
  width: 6px;
  height: 6px;
  background: var(--accent-green);
  border-radius: 50%;
}

.stream-card-visual {
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
}

.speed-metric {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 12px;
  margin-bottom: 14px;
}

.speed-num {
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--accent-cyan);
}

/* ==========================================================================
   套餐价格表
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}

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

.pricing-card.featured {
  border-color: var(--accent-cyan);
  background: linear-gradient(180deg, #1c2a47 0%, #162035 100%);
  transform: scale(1.02);
  box-shadow: 0 8px 30px rgba(0, 229, 255, 0.12);
}

.pricing-ribbon {
  position: absolute;
  top: -12px;
  right: 24px;
  background: linear-gradient(135deg, #00e5ff 0%, #3b82f6 100%);
  color: #050b17;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 4px 12px;
  border-radius: 9999px;
  text-transform: uppercase;
}

.pricing-name {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.pricing-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 24px;
  min-height: 40px;
}

.pricing-price {
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--text-main);
  line-height: 1;
  margin-bottom: 6px;
}

.pricing-price small {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
}

.pricing-term {
  color: var(--accent-cyan);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
}

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

.pricing-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.pricing-feature-item svg {
  width: 16px;
  height: 16px;
  fill: var(--accent-cyan);
  flex-shrink: 0;
}

/* 套餐对比表格容器 */
.table-wrapper {
  margin-top: 48px;
  overflow-x: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-card);
}

.pricing-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
}

.pricing-table caption {
  padding: 16px 20px;
  font-weight: 700;
  font-size: 1.1rem;
  text-align: left;
  background: rgba(255, 255, 255, 0.02);
  border-bottom: 1px solid var(--border-color);
}

.pricing-table th, .pricing-table td {
  padding: 14px 20px;
  border-bottom: 1px solid var(--border-color);
}

.pricing-table th {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-main);
  font-weight: 600;
}

.pricing-table td {
  color: var(--text-muted);
}

.pricing-table tr:last-child td {
  border-bottom: none;
}

/* ==========================================================================
   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: 28px;
  display: flex;
  flex-direction: column;
}

.review-stars {
  color: #f59e0b;
  font-size: 1.1rem;
  margin-bottom: 14px;
  letter-spacing: 2px;
}

.review-text {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
  flex-grow: 1;
  margin-bottom: 20px;
}

.reviewer-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border-color);
  padding-top: 14px;
}

.reviewer-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(0, 229, 255, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--accent-cyan);
}

.reviewer-name {
  font-weight: 600;
  font-size: 0.95rem;
}

.reviewer-role {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* ==========================================================================
   常见问题解答 (FAQ) - 原生 details/summary，默认展开规范
   ========================================================================== */
.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);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item[open] {
  border-color: rgba(0, 229, 255, 0.35);
}

.faq-summary {
  padding: 18px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 44px;
  user-select: none;
}

.faq-summary::-webkit-details-marker {
  display: none;
}

.faq-icon {
  width: 20px;
  height: 20px;
  fill: var(--accent-cyan);
  transition: transform var(--transition-fast);
  flex-shrink: 0;
  margin-left: 12px;
}

.faq-item[open] .faq-icon {
  transform: rotate(180deg);
}

.faq-content {
  padding: 0 24px 22px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  margin-top: 8px;
  padding-top: 14px;
}

/* ==========================================================================
   文章与科普页面专用样式
   ========================================================================== */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 24px;
}

.breadcrumbs a {
  color: var(--text-muted);
}

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

.article-header {
  margin-bottom: 36px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 24px;
}

.article-title {
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
}

.article-meta {
  display: flex;
  gap: 20px;
  font-size: 0.85rem;
  color: var(--text-dim);
  flex-wrap: wrap;
}

.prose {
  max-width: 820px;
  margin: 0 auto;
  font-size: 1.05rem;
  line-height: 1.8;
  color: #cbd5e1;
}

.prose h2 {
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--text-main);
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.prose h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 28px 0 12px;
}

.prose p {
  margin-bottom: 20px;
}

.prose ul, .prose ol {
  margin: 0 0 24px 24px;
}

.prose li {
  margin-bottom: 8px;
}

.prose blockquote {
  border-left: 4px solid var(--accent-cyan);
  background: rgba(0, 229, 255, 0.05);
  padding: 14px 20px;
  margin: 24px 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-muted);
}

.prose a {
  color: var(--accent-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose a:hover {
  color: #38bdf8;
}

.article-cta-box {
  background: linear-gradient(135deg, #162035 0%, #1e2c48 100%);
  border: 1px solid rgba(0, 229, 255, 0.3);
  border-radius: var(--radius-md);
  padding: 32px;
  text-align: center;
  margin: 48px 0;
}

.article-cta-box h3 {
  font-size: 1.35rem;
  margin-bottom: 12px;
  color: var(--text-main);
}

.article-cta-box p {
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 20px;
  font-size: 0.95rem;
}

/* 知识科普文章列表卡片 */
.article-card-list {
  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: 28px 24px;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 229, 255, 0.4);
}

.article-card-tag {
  color: var(--accent-cyan);
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.article-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 12px;
  color: var(--text-main);
}

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

.article-card-excerpt {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
  flex-grow: 1;
  margin-bottom: 20px;
}

.article-card-footer {
  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, 0.05);
  padding-top: 14px;
}

/* ==========================================================================
   页脚 (Footer) - 严格遵循4个独立页面链接规范
   ========================================================================== */
.site-footer {
  margin-top: auto;
  background: #060913;
  border-top: 1px solid var(--border-color);
  padding: 48px 0 32px;
}

.footer-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 32px;
  list-style: none;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.footer-link {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition-fast);
  padding: 8px 12px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.footer-link:hover, .footer-link:focus-visible {
  color: var(--accent-cyan);
}

.footer-meta {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
  line-height: 1.6;
}

.footer-meta p {
  margin-bottom: 6px;
}

/* ==========================================================================
   响应式断点与移动端适配 (@media)
   ========================================================================== */
@media (max-width: 1024px) {
  .grid-3, .pricing-grid, .reviews-grid, .article-card-list {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card.featured {
    transform: none;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2rem;
  }
  .section-title {
    font-size: 1.6rem;
  }
  .grid-3, .pricing-grid, .reviews-grid, .article-card-list {
    grid-template-columns: 1fr;
  }
  .stream-ai-card {
    grid-template-columns: 1fr;
    padding: 24px;
  }
  .nav-menu {
    display: none; /* 移动端精简模式 */
  }
  .footer-nav {
    gap: 16px;
  }
  .btn-lg {
    width: 100%;
  }
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  .hero-cta-group .btn {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }
  .hero-title {
    font-size: 1.75rem;
  }
  .feature-pill {
    width: 100%;
    justify-content: center;
  }
  .faq-summary {
    padding: 14px 16px;
    font-size: 0.95rem;
  }
}