/* ==========================================================================
   XX云加速 (xxyunjiasu.top) - 原生极简超高速样式表
   零外部依赖 | 纯原生CSS | 毫秒级秒开 | 全端响应式
   ========================================================================== */

:root {
  --bg-primary: #07090e;
  --bg-secondary: #0e131f;
  --bg-card: rgba(18, 25, 40, 0.75);
  --bg-card-hover: rgba(28, 38, 62, 0.85);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-highlight: rgba(59, 130, 246, 0.4);
  
  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --text-dim: #6b7280;
  
  --accent-blue: #3b82f6;
  --accent-blue-hover: #2563eb;
  --accent-cyan: #06b6d4;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-purple: #8b5cf6;
  
  --gradient-brand: linear-gradient(135deg, #3b82f6 0%, #06b6d4 100%);
  --gradient-glow: linear-gradient(135deg, rgba(59, 130, 246, 0.15) 0%, rgba(6, 182, 212, 0.05) 100%);
  --gradient-card-hot: linear-gradient(180deg, rgba(59, 130, 246, 0.15) 0%, rgba(18, 25, 40, 0.9) 100%);
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 10px 30px -10px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 35px -5px rgba(59, 130, 246, 0.35);
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  --max-width: 1200px;
}

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

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

body {
  line-height: 1.6;
  overflow-x: hidden;
  background: radial-gradient(circle at 50% 0%, #151d33 0%, var(--bg-primary) 65%);
  min-height: 100vh;
}

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

/* 链接样式 */
a {
  color: inherit;
  text-decoration: none;
  transition: all 0.2s ease;
}

/* ==========================================================================
   头部导航 (与首页保持完全一致：星链极夜科技风)
   深空藏蓝 #0A1128 | 强调色星链青 #38BDF8 | 白色正文
   ========================================================================== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  background-color: rgba(10, 17, 40, 0.85);
  border-bottom: 1px solid rgba(56, 189, 248, 0.22);
  height: 76px;
  display: flex;
  align-items: center;
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-weight: 900;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
  color: #ffffff;
}

.brand-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid #38bdf8;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #38bdf8;
  box-shadow: 0 0 16px rgba(56, 189, 248, 0.3);
  position: relative;
}

.brand-domain {
  font-family: "Space Grotesk", "SF Mono", Consolas, monospace;
  font-size: 0.82rem;
  color: #38bdf8;
  font-weight: 500;
  margin-left: 6px;
  padding: 2px 6px;
  background: rgba(56, 189, 248, 0.12);
  border-radius: 6px;
}

.nav-links {
  display: flex;
  gap: 26px;
  align-items: center;
  list-style: none;
}

.nav-links a {
  color: #94a3b8;
  font-size: 0.92rem;
  font-weight: 500;
  position: relative;
}

.nav-links a:hover {
  color: #38bdf8;
  text-shadow: 0 0 10px rgba(56, 189, 248, 0.45);
}

.nav-links a.nav-highlight {
  color: #38bdf8;
  background: rgba(56, 189, 248, 0.12);
  padding: 5px 14px;
  border-radius: 9999px;
  border: 1px solid rgba(56, 189, 248, 0.22);
  font-weight: 600;
  font-family: "Space Grotesk", "SF Mono", Consolas, monospace;
}

.nav-links a.nav-highlight:hover {
  background: rgba(56, 189, 248, 0.22);
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.4);
  color: #fff;
}

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

.header-cta .btn-primary {
  background: #38bdf8;
  color: #0a1128;
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.45);
  border-color: #38bdf8;
  font-weight: 800;
  border-radius: 9999px;
  padding: 10px 22px;
  font-size: 0.92rem;
  min-height: 42px;
}

.header-cta .btn-primary:hover {
  background: #7dd3fc;
  box-shadow: 0 0 28px rgba(56, 189, 248, 0.7);
  color: #0a1128;
  transform: translateY(-2px);
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.2s ease;
  white-space: nowrap;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--gradient-brand);
  color: #ffffff;
  box-shadow: 0 4px 18px rgba(59, 130, 246, 0.45);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(59, 130, 246, 0.6);
  color: #ffffff;
}

.btn-outline {
  background: rgba(255, 255, 255, 0.05);
  color: #e5e7eb;
  border-color: rgba(255, 255, 255, 0.18);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.3);
  color: #fff;
  transform: translateY(-2px);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.1rem;
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.88rem;
}

.btn-block {
  width: 100%;
}

/* 主视觉区 (Hero) */
.hero-section {
  padding: 85px 0 60px;
  text-align: center;
  position: relative;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(59, 130, 246, 0.12);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  color: #60a5fa;
  margin-bottom: 24px;
}

.hero-pill .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-emerald);
  box-shadow: 0 0 8px var(--accent-emerald);
}

.hero-title {
  font-size: clamp(2.2rem, 5.5vw, 3.8rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 24px;
  letter-spacing: -0.03em;
  color: #ffffff;
}

.gradient-text {
  background: linear-gradient(135deg, #60a5fa 10%, #38bdf8 50%, #34d399 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-en {
  font-family: inherit;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--text-muted);
  max-width: 760px;
  margin: 0 auto 24px;
  line-height: 1.7;
}

/* 主视觉区简介卡片 */
.hero-bio-card {
  max-width: 820px;
  margin: 0 auto 36px;
  background: rgba(18, 25, 40, 0.65);
  border: 1px solid rgba(59, 130, 246, 0.25);
  border-radius: var(--radius-md);
  padding: 18px 24px;
  text-align: left;
  backdrop-filter: blur(12px);
  position: relative;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.hero-bio-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  border-radius: var(--radius-md) 0 0 var(--radius-md);
  background: var(--gradient-brand);
}

.hero-bio-text {
  font-size: 0.94rem;
  color: #cbd5e1;
  line-height: 1.75;
}

.hero-bio-text strong {
  color: var(--accent-cyan);
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 50px;
  flex-wrap: wrap;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: 1.85rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.02em;
}

.stat-number span {
  color: var(--accent-cyan);
}

.stat-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* 模块通用标题 */
.section {
  padding: 90px 0;
  position: relative;
}

.section-alt {
  background: rgba(14, 19, 31, 0.5);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 54px;
}

.section-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-blue);
  margin-bottom: 10px;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: 1.02rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 核心优势 (3个图文卡片) */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  position: relative;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-highlight);
  box-shadow: var(--shadow-glow);
}

.feature-icon-wrapper {
  width: 58px;
  height: 58px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
}

.icon-blue {
  background: rgba(59, 130, 246, 0.15);
  color: #60a5fa;
  border: 1px solid rgba(59, 130, 246, 0.3);
}

.icon-cyan {
  background: rgba(6, 182, 212, 0.15);
  color: #22d3ee;
  border: 1px solid rgba(6, 182, 212, 0.3);
}

.icon-emerald {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.feature-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 14px;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

.feature-highlights {
  list-style: none;
  border-top: 1px solid var(--border-subtle);
  padding-top: 18px;
}

.feature-highlights li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  color: #d1d5db;
  margin-bottom: 8px;
}

.feature-highlights li:last-child {
  margin-bottom: 0;
}

.check-icon {
  width: 16px;
  height: 16px;
  color: var(--accent-emerald);
  flex-shrink: 0;
}

/* 流媒体与AI支持卡片 */
.media-ai-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

.media-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 34px;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(12px);
}

.media-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
}

.media-card.stream::before {
  background: linear-gradient(90deg, #ef4444, #f59e0b, #e11d48);
}

.media-card.ai::before {
  background: linear-gradient(90deg, #8b5cf6, #3b82f6, #06b6d4);
}

.card-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 600;
  margin-bottom: 14px;
}

.badge-stream {
  background: rgba(239, 68, 68, 0.15);
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.badge-ai {
  background: rgba(139, 92, 246, 0.15);
  color: #c084fc;
  border: 1px solid rgba(139, 92, 246, 0.3);
}

.media-card h3 {
  font-size: 1.45rem;
  color: #fff;
  margin-bottom: 10px;
}

.media-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 24px;
}

.service-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 24px;
}

.service-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  color: #e5e7eb;
  transition: all 0.2s ease;
}

.service-tag:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
}

.service-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.dot-netflix { background: #e50914; }
.dot-disney { background: #113ccf; }
.dot-youtube { background: #ff0000; }
.dot-tiktok { background: #00f2fe; }
.dot-chatgpt { background: #10a37f; }
.dot-claude { background: #d97706; }
.dot-midjourney { background: #6366f1; }
.dot-gemini { background: #4285f4; }

.tech-spec-bar {
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.86rem;
  color: var(--text-muted);
}

.tech-spec-bar strong {
  color: #fff;
}

/* 价格对比表 (Pricing) */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
  align-items: stretch;
}

.price-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 38px 28px;
  position: relative;
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease, border-color 0.25s ease;
  backdrop-filter: blur(12px);
}

.price-card.featured {
  background: var(--gradient-card-hot);
  border-color: var(--accent-blue);
  box-shadow: 0 0 40px -10px rgba(59, 130, 246, 0.4);
  transform: scale(1.03);
  z-index: 2;
}

.price-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent-blue);
}

.price-card.featured:hover {
  transform: scale(1.03) translateY(-5px);
}

.hot-tag {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-brand);
  color: #fff;
  font-size: 0.76rem;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

.plan-name {
  font-size: 1.3rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 6px;
}

.plan-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 22px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border-subtle);
}

.plan-currency {
  font-size: 1.4rem;
  font-weight: 700;
  color: #fff;
}

.plan-amount {
  font-size: 2.8rem;
  font-weight: 800;
  color: #fff;
  line-height: 1;
}

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

.plan-features {
  list-style: none;
  margin-bottom: 30px;
  flex-grow: 1;
}

.plan-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: #e5e7eb;
  margin-bottom: 13px;
}

.plan-features li.disabled {
  color: var(--text-dim);
  text-decoration: line-through;
}

/* 用户评价 (Testimonials) */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 26px;
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.review-card:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 255, 255, 0.2);
}

.review-stars {
  color: var(--accent-amber);
  display: flex;
  gap: 3px;
  margin-bottom: 14px;
  font-size: 0.9rem;
}

.review-text {
  font-size: 0.92rem;
  color: #d1d5db;
  line-height: 1.65;
  margin-bottom: 20px;
  font-style: italic;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border-subtle);
  padding-top: 14px;
}

.avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--bg-secondary);
  border: 2px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
  color: #fff;
  flex-shrink: 0;
}

.author-info h4 {
  font-size: 0.92rem;
  color: #fff;
  margin-bottom: 2px;
}

.author-info span {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* 常见问题解答 (FAQ) - 原生无JS details/summary */
.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-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.faq-item:hover {
  border-color: rgba(59, 130, 246, 0.3);
}

.faq-item summary {
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 600;
  color: #fff;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  list-style: none;
  user-select: none;
}

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

.faq-toggle-icon {
  width: 20px;
  height: 20px;
  color: var(--accent-blue);
  transition: transform 0.25s ease;
  flex-shrink: 0;
}

.faq-item[open] .faq-toggle-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, 0.04);
  padding-top: 16px;
}

/* CTA 转换呼吁区 */
.cta-banner {
  padding: 70px 0;
  background: radial-gradient(circle at 50% 50%, rgba(59, 130, 246, 0.18) 0%, rgba(14, 19, 31, 0.8) 100%);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  text-align: center;
}

.cta-banner-inner {
  max-width: 720px;
  margin: 0 auto;
}

.cta-banner h2 {
  font-size: clamp(1.9rem, 3.5vw, 2.6rem);
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
}

.cta-banner p {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 32px;
}

/* 页脚 (规范：仅保留4个标题，打开新页面) */
.footer {
  background: #040609;
  border-top: 1px solid var(--border-subtle);
  padding: 48px 0 36px;
}

.footer-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 36px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}

.footer-nav a {
  color: #d1d5db;
  font-size: 1rem;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.footer-nav a:hover {
  color: #fff;
  background: rgba(59, 130, 246, 0.15);
  border-color: rgba(59, 130, 246, 0.4);
  transform: translateY(-2px);
}

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

/* ==========================================================================
   通用子页面专用样式 (关于我们 / 服务条款 / 隐私政策 / 网站地图)
   ========================================================================== */
.subpage-hero {
  padding: 60px 0 40px;
  text-align: center;
  border-bottom: 1px solid var(--border-subtle);
  background: radial-gradient(circle at 50% 0%, #151d33 0%, var(--bg-primary) 80%);
}

.subpage-hero h1 {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  color: #fff;
  margin-bottom: 14px;
}

.subpage-hero p {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto;
}

.subpage-content {
  padding: 60px 0 80px;
}

.doc-wrapper {
  max-width: 880px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 48px;
  backdrop-filter: blur(12px);
}

.doc-section {
  margin-bottom: 40px;
}

.doc-section:last-child {
  margin-bottom: 0;
}

.doc-section h2 {
  font-size: 1.45rem;
  color: #fff;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding-bottom: 10px;
}

.doc-section p, .doc-section li {
  color: #d1d5db;
  font-size: 0.98rem;
  line-height: 1.8;
  margin-bottom: 12px;
}

.doc-section ul {
  padding-left: 24px;
  margin-bottom: 16px;
}

.doc-highlight-box {
  background: rgba(59, 130, 246, 0.08);
  border-left: 4px solid var(--accent-blue);
  padding: 18px 22px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 20px 0;
}

.doc-highlight-box.danger {
  background: rgba(239, 68, 68, 0.08);
  border-left-color: #ef4444;
}

.doc-highlight-box.success {
  background: rgba(16, 185, 129, 0.08);
  border-left-color: var(--accent-emerald);
}

/* 网站地图网格 */
.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.sitemap-group {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
}

.sitemap-group h3 {
  font-size: 1.15rem;
  color: var(--accent-cyan);
  margin-bottom: 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  padding-bottom: 8px;
}

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

.sitemap-links li {
  margin-bottom: 10px;
}

.sitemap-links a {
  color: #d1d5db;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
}

.sitemap-links a:hover {
  color: var(--accent-blue);
  transform: translateX(4px);
}

/* ==========================================================================
   响应式媒体查询适配 (@media)
   确保移动端单栏、大触摸点击区、字体优雅
   ========================================================================== */
@media (max-width: 992px) {
  .features-grid,
  .pricing-grid,
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .price-card.featured {
    transform: none;
  }
  
  .price-card.featured:hover {
    transform: translateY(-5px);
  }
  
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
}

@media (max-width: 768px) {
  .header {
    height: auto;
    padding: 14px 0;
  }
  
  .header-inner {
    flex-wrap: wrap;
    gap: 12px;
  }
  
  .nav-links {
    display: none; /* 移动端精简模式，极致首屏速度与无多余冗余 */
  }
  
  .hero-section {
    padding: 50px 0 40px;
  }
  
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  
  .hero-actions .btn {
    width: 100%;
  }
  
  .hero-stats {
    grid-template-columns: 1fr 1fr;
    padding: 18px 14px;
  }
  
  .stat-number {
    font-size: 1.5rem;
  }
  
  .features-grid,
  .media-ai-container,
  .pricing-grid,
  .reviews-grid,
  .sitemap-grid {
    grid-template-columns: 1fr; /* 完美单栏布局 */
  }
  
  .feature-card,
  .media-card,
  .price-card,
  .doc-wrapper {
    padding: 24px 18px;
  }
  
  .footer-nav {
    flex-direction: column;
    gap: 12px;
    width: 100%;
  }
  
  .footer-nav a {
    width: 100%;
    justify-content: center;
    padding: 12px;
    font-size: 1.05rem;
  }
  
  .btn {
    min-height: 48px; /* 移动端指尖友好标准尺寸 */
  }
}

/* ==========================================================================
   无障碍 (Accessibility) 与交互增强
   ========================================================================== */

/* 键盘跳过导航入口 */
.skip-to-content {
  position: absolute;
  top: -100px;
  left: 20px;
  background: var(--accent-blue, #38bdf8);
  color: #060a17;
  font-weight: 700;
  padding: 12px 20px;
  border-radius: var(--radius-md, 8px);
  z-index: 9999;
  text-decoration: none;
  transition: top 0.2s ease;
  box-shadow: 0 4px 15px rgba(56, 189, 248, 0.4);
}
.skip-to-content:focus {
  top: 20px;
  outline: 3px solid #ffffff;
}

/* 键盘可访问性焦点指示器 */
:focus-visible {
  outline: 2px solid var(--accent-blue, #38bdf8);
  outline-offset: 3px;
}

/* 锚点滚动距离，避免被固定导航栏遮挡 */
section[id], article[id], div[id], h2[id], h3[id] {
  scroll-margin-top: 92px;
}

/* 折叠/展开无障碍 details/summary 基础 */
details.faq-item summary {
  cursor: pointer;
  list-style: none;
}
details.faq-item summary::-webkit-details-marker {
  display: none;
}

/* 减弱动态效果支持 (prefers-reduced-motion) */
@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;
  }
}