/* ==========================================================================
   山水云机场 - 纯原生极速响应式样式表 style.css
   规范：无外部依赖、支持深色主题、WCAG AA 对比度、prefers-reduced-motion
   ========================================================================== */

:root {
  --bg-primary: #0a0f1d;
  --bg-secondary: #111827;
  --bg-card: #162032;
  --bg-card-hover: #1e2d45;
  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --text-dim: #6b7280;
  --accent-cyan: #00d2ff;
  --accent-blue: #2563eb;
  --accent-gradient: linear-gradient(135deg, #00d2ff 0%, #3b82f6 100%);
  --accent-gold: #f59e0b;
  --accent-green: #10b981;
  --border-color: #243247;
  --border-highlight: #38bdf8;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.45);
  --container-max: 1200px;
  --header-height: 72px;
}

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

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-main);
  scroll-behavior: smooth;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 50% 12%, rgba(0, 210, 255, 0.06) 0%, transparent 55%),
    radial-gradient(circle at 85% 45%, rgba(37, 99, 235, 0.04) 0%, transparent 50%),
    radial-gradient(circle at 15% 75%, rgba(0, 210, 255, 0.03) 0%, transparent 50%);
  background-attachment: fixed;
}

/* 键盘可访问性跳过链接 */
.skip-link {
  position: absolute;
  top: -60px;
  left: 16px;
  background: var(--accent-cyan);
  color: #050b14;
  font-weight: 700;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  z-index: 9999;
  transition: top 0.2s ease;
  text-decoration: none;
}
.skip-link:focus {
  top: 16px;
  outline: 3px solid #fff;
}

/* 容器与版心 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 20px;
}

/* 锚点防遮挡 */
h1, h2, h3, h4, section {
  scroll-margin-top: calc(var(--header-height) + 24px);
}

/* 顶部导航栏 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 15, 29, 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;
}
.site-header .header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}
.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-main);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}
.brand-logo svg {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  filter: drop-shadow(0 0 8px rgba(0, 242, 254, 0.45));
  transition: transform 0.25s ease, filter 0.25s ease;
}
.brand-logo:hover svg {
  transform: scale(1.06) rotate(-2deg);
  filter: drop-shadow(0 0 16px rgba(0, 242, 254, 0.8));
}
.brand-logo span {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.site-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}
.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s ease;
  padding: 8px 4px;
}
.nav-link:hover, .nav-link:focus-visible {
  color: var(--accent-cyan);
  outline: none;
}
.nav-link.active {
  color: var(--accent-cyan);
  font-weight: 700;
  border-bottom: 2px solid var(--accent-cyan);
}
.nav-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* 按钮通用规范 (满足触摸区域 >= 44x44px，严格单行不对折) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  min-width: 44px;
  padding: 10px 24px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  word-break: keep-all;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.2s ease;
  border: 1px solid transparent;
}
.btn:focus-visible {
  outline: 3px solid var(--accent-cyan);
  outline-offset: 2px;
}
.btn-primary {
  background: var(--accent-gradient);
  color: #050b14;
  box-shadow: 0 4px 14px rgba(0, 210, 255, 0.35);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(0, 210, 255, 0.5);
}
.btn-secondary {
  background: var(--bg-card);
  color: var(--text-main);
  border-color: var(--border-color);
}
.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-highlight);
}
.btn-lg {
  min-height: 50px;
  padding: 12px 32px;
  font-size: 1.05rem;
}

/* 主视觉 Hero 区域 */
.hero-section {
  padding: 85px 0 65px;
  position: relative;
  text-align: center;
  overflow: hidden;
  background-color: var(--bg-primary);
  background-image: 
    radial-gradient(circle at 50% 30%, rgba(0, 242, 254, 0.1) 0%, transparent 60%),
    linear-gradient(rgba(0, 242, 254, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 242, 254, 0.03) 1px, transparent 1px);
  background-size: 100% 100%, 48px 48px, 48px 48px;
  background-position: 0 0, center center, center center;
}
.hero-section .container {
  position: relative;
  z-index: 2;
}

/* 朦胧水墨山水画画境与科技特效背景 */
.shanshui-backdrop {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
  overflow: hidden;
}
.shanshui-svg {
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  min-width: 1280px;
  height: 100%;
  object-fit: cover;
  pointer-events: none;
}
.shanshui-mist-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(10, 15, 29, 0.5) 0%,
    rgba(10, 15, 29, 0.1) 30%,
    rgba(10, 15, 29, 0.6) 70%,
    var(--bg-primary) 100%
  );
  pointer-events: none;
}

/* 科技山水特效动画 */
.mist-flow-1 {
  animation: drift-mist-1 24s ease-in-out infinite alternate;
  transform-origin: center;
}
.mist-flow-2 {
  animation: drift-mist-2 18s ease-in-out infinite alternate;
  transform-origin: center;
}
.mist-flow-3 {
  animation: drift-mist-1 30s ease-in-out infinite alternate-reverse;
  transform-origin: center;
}
.sun-pulse {
  animation: celestial-glow 7s ease-in-out infinite alternate;
  transform-origin: 1180px 180px;
}
.cyber-node {
  animation: node-twinkle 4s ease-in-out infinite alternate;
  transform-box: fill-box;
  transform-origin: center;
}
.cyber-node-1 { animation-delay: 0s; }
.cyber-node-2 { animation-delay: 1.2s; }
.cyber-node-3 { animation-delay: 2.4s; }
.cyber-node-4 { animation-delay: 0.8s; }
.cyber-node-5 { animation-delay: 1.8s; }
.cyber-node-6 { animation-delay: 3.2s; }

.beam-pulse {
  stroke-dasharray: 80 320;
  animation: beam-flow 7s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}
.beam-pulse-reverse {
  stroke-dasharray: 90 350;
  animation: beam-flow-reverse 8.5s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

@keyframes drift-mist-1 {
  0% { transform: translate3d(0, 0, 0) scaleY(1); }
  50% { transform: translate3d(-40px, -6px, 0) scaleY(1.06); }
  100% { transform: translate3d(30px, 4px, 0) scaleY(0.96); }
}
@keyframes drift-mist-2 {
  0% { transform: translate3d(0, 0, 0) scaleX(1); }
  50% { transform: translate3d(45px, -8px, 0) scaleX(1.05); }
  100% { transform: translate3d(-30px, 5px, 0) scaleX(0.97); }
}
@keyframes celestial-glow {
  0% { opacity: 0.2; transform: scale(0.94); }
  50% { opacity: 0.42; transform: scale(1.08); filter: drop-shadow(0 0 25px rgba(0, 242, 254, 0.5)); }
  100% { opacity: 0.25; transform: scale(0.98); }
}
@keyframes node-twinkle {
  0% { opacity: 0.2; transform: scale(0.8); }
  50% { opacity: 1; transform: scale(1.4); filter: drop-shadow(0 0 8px #00f2fe); }
  100% { opacity: 0.3; transform: scale(0.9); }
}
@keyframes beam-flow {
  0% { stroke-dashoffset: 400; opacity: 0; }
  15% { opacity: 0.85; }
  85% { opacity: 0.85; }
  100% { stroke-dashoffset: -400; opacity: 0; }
}
@keyframes beam-flow-reverse {
  0% { stroke-dashoffset: -440; opacity: 0; }
  15% { opacity: 0.85; }
  85% { opacity: 0.85; }
  100% { stroke-dashoffset: 440; opacity: 0; }
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(0, 210, 255, 0.1);
  border: 1px solid rgba(0, 210, 255, 0.3);
  border-radius: 999px;
  color: var(--accent-cyan);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
}
.hero-badge .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan);
}
.hero-title {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 18px;
  color: #ffffff;
}
.hero-title .gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-subtitle {
  font-size: clamp(1.1rem, 2.5vw, 1.35rem);
  color: var(--accent-cyan);
  font-weight: 600;
  margin-bottom: 16px;
}
.hero-desc {
  max-width: 800px;
  margin: 0 auto 32px;
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.75;
}
.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}
.hero-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 960px;
  margin: 0 auto;
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}
.metric-item {
  text-align: center;
}
.metric-number {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--accent-cyan);
  margin-bottom: 4px;
}
.metric-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* 区块通用结构 */
.section-block {
  padding: 60px 0;
}
.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 48px;
}
.section-tag {
  display: inline-block;
  font-size: 0.825rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--accent-cyan);
  letter-spacing: 1px;
  margin-bottom: 8px;
}
.section-title {
  font-size: clamp(1.6rem, 3.5vw, 2.3rem);
  font-weight: 800;
  color: #fff;
  margin-bottom: 14px;
  line-height: 1.3;
}
.section-subtitle {
  font-size: 1rem;
  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: 28px;
}
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-highlight);
  box-shadow: var(--shadow-lg);
}
.feature-icon-wrapper {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: rgba(0, 210, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--accent-cyan);
}
.feature-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
}
.feature-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* 流媒体与 AI 支持图卡 */
.unlock-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}
.unlock-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
}
.unlock-card-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
}
.unlock-card-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: #fff;
}
.unlock-badge-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}
.unlock-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
}
.unlock-badge svg {
  width: 16px;
  height: 16px;
  color: var(--accent-cyan);
}

/* 套餐价格对比表 */
.pricing-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-bottom: 24px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
}
.pricing-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 680px;
}
.pricing-table caption {
  font-size: 0.9rem;
  color: var(--text-dim);
  padding: 12px;
  text-align: right;
  caption-side: bottom;
}
.pricing-table th, .pricing-table td {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
  vertical-align: middle;
}
.pricing-table th:last-child,
.pricing-table td:last-child {
  white-space: nowrap;
  min-width: 140px;
  text-align: center;
}
.pricing-table .btn {
  white-space: nowrap;
  word-break: keep-all;
  min-width: 110px;
  padding: 10px 20px;
}
.pricing-table th {
  background: var(--bg-secondary);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
}
.pricing-table tbody tr:hover {
  background: rgba(255, 255, 255, 0.02);
}
.plan-name-cell {
  display: flex;
  flex-direction: column;
}
.plan-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
}
.plan-badge {
  display: inline-block;
  font-size: 0.75rem;
  color: var(--accent-cyan);
  font-weight: 600;
  margin-top: 4px;
}
.plan-price {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--accent-cyan);
}
.plan-period {
  font-size: 0.85rem;
  color: var(--text-dim);
  font-weight: 400;
}

/* 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-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.review-stars {
  color: var(--accent-gold);
  font-size: 1.1rem;
  margin-bottom: 12px;
}
.review-content {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 20px;
}
.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
}
.review-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent-gradient);
  color: #050b14;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
}
.review-user-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: #fff;
}
.review-user-role {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* FAQ 常见问题 (默认展开) */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 860px;
  margin: 0 auto;
}
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.2s ease;
}
.faq-item:hover {
  border-color: var(--border-highlight);
}
.faq-summary {
  padding: 18px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  outline: none;
}
.faq-summary::-webkit-details-marker {
  display: none;
}
.faq-summary::after {
  content: "▾";
  font-size: 1.2rem;
  color: var(--accent-cyan);
  transition: transform 0.2s ease;
}
.faq-item[open] .faq-summary::after {
  transform: rotate(180deg);
}
.faq-summary:focus-visible {
  outline: 2px solid var(--accent-cyan);
}
.faq-content {
  padding: 0 24px 20px;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  margin-top: 4px;
}
.faq-content a {
  color: var(--accent-cyan);
  text-decoration: underline;
}

/* 知识科普专区页面布局 */
.knowledge-hero {
  padding: 60px 0 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border-color);
  background: radial-gradient(circle at 50% 30%, rgba(0, 210, 255, 0.08) 0%, rgba(17, 24, 39, 0.95) 70%);
}
.knowledge-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-top: 40px;
}
.knowledge-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.2s ease, border-color 0.2s ease;
}
.knowledge-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-highlight);
}
.knowledge-card-tag {
  font-size: 0.8rem;
  color: var(--accent-cyan);
  font-weight: 700;
  margin-bottom: 8px;
}
.knowledge-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  line-height: 1.45;
  margin-bottom: 12px;
}
.knowledge-card-title a {
  color: #fff;
  text-decoration: none;
}
.knowledge-card-title a:hover {
  color: var(--accent-cyan);
}
.knowledge-card-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
  flex-grow: 1;
}
.knowledge-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-color);
  padding-top: 12px;
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* 文章详情页样式 */
.article-container {
  max-width: 860px;
  margin: 40px auto 60px;
  padding: 0 20px;
}
.article-header {
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
}
.article-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 14px;
}
.article-title {
  font-size: clamp(1.75rem, 3.5vw, 2.4rem);
  font-weight: 800;
  color: #fff;
  line-height: 1.35;
  margin-bottom: 16px;
}
.article-content {
  font-size: 1.05rem;
  line-height: 1.85;
  color: #d1d5db;
}
.article-content h2 {
  font-size: 1.45rem;
  color: #fff;
  margin: 36px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}
.article-content h3 {
  font-size: 1.2rem;
  color: var(--accent-cyan);
  margin: 24px 0 12px;
}
.article-content p {
  margin-bottom: 20px;
}
.article-content ul, .article-content ol {
  margin: 0 0 20px 24px;
}
.article-content li {
  margin-bottom: 8px;
}
.article-content a {
  color: var(--accent-cyan);
  text-decoration: underline;
}
.article-cta-box {
  margin: 40px 0;
  padding: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-lg);
  text-align: center;
}

/* 页脚 - 严格只保留四个标题 */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 48px 0 32px;
  margin-top: auto;
}
.footer-links-row {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 48px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}
.footer-link-item {
  font-size: 1.05rem;
  font-weight: 700;
}
.footer-link-item a {
  color: var(--text-main);
  text-decoration: none;
  transition: color 0.2s ease;
  padding: 8px 12px;
  display: inline-block;
  min-height: 44px;
  line-height: 28px;
}
.footer-link-item a:hover, .footer-link-item a:focus-visible {
  color: var(--accent-cyan);
}
.footer-copyright {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-dim);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 24px;
}

/* 独立单页内容容器 (关于我们/条款/隐私/网站地图) */
.static-page-section {
  padding: 60px 0 80px;
  max-width: 900px;
  margin: 0 auto;
}
.static-page-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
}
.static-page-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 16px;
}
.static-page-content h2 {
  font-size: 1.35rem;
  color: var(--accent-cyan);
  margin: 28px 0 12px;
}
.static-page-content p {
  color: #d1d5db;
  line-height: 1.8;
  margin-bottom: 16px;
}
.static-page-content ul {
  margin: 0 0 20px 24px;
  color: #d1d5db;
}

/* 网站地图列表 */
.sitemap-group {
  margin-bottom: 32px;
}
.sitemap-group h2 {
  font-size: 1.25rem;
  color: var(--accent-cyan);
  margin-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 6px;
}
.sitemap-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
.sitemap-list li a {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-main);
  text-decoration: none;
  padding: 10px 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
  min-height: 44px;
}
.sitemap-list li a:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

/* 响应式媒体查询 @media */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .knowledge-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }
  .features-grid,
  .unlock-grid,
  .reviews-grid,
  .knowledge-grid,
  .hero-metrics,
  .sitemap-list {
    grid-template-columns: 1fr;
  }
  .hero-metrics {
    gap: 16px;
  }
  .site-nav {
    display: none; /* 移动端精简导航 */
  }
  .footer-links-row {
    gap: 16px;
    flex-direction: column;
    text-align: center;
  }
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  .hero-actions .btn {
    width: 100%;
  }
  .static-page-card {
    padding: 24px 16px;
  }
}

/* 减少动态效果遵循无障碍 */
@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;
  }
}