/* ==========================================================================
   极速云 (Jisuyun) - 现代化纯原生高转化率样式表
   零外部依赖 | 纯原生 CSS | 秒开级加载体验 | 完美移动端响应式
   ========================================================================== */

:root {
  --bg-main: #090d16;
  --bg-card: rgba(18, 26, 44, 0.75);
  --bg-card-hover: rgba(26, 38, 64, 0.9);
  --bg-card-active: #151e32;
  --bg-nav: rgba(9, 13, 22, 0.85);
  
  --primary: #00f2fe;
  --primary-hover: #4facfe;
  --primary-glow: rgba(0, 242, 254, 0.35);
  --gradient-main: linear-gradient(135deg, #00f2fe 0%, #4facfe 50%, #7f53ac 100%);
  --gradient-btn: linear-gradient(135deg, #00c6ff 0%, #0072ff 100%);
  --gradient-btn-hover: linear-gradient(135deg, #00d8ff 0%, #0084ff 100%);
  --gradient-card-hot: linear-gradient(180deg, rgba(0, 242, 254, 0.15) 0%, rgba(18, 26, 44, 0.85) 100%);
  
  --text-main: #f1f5f9;
  --text-sub: #94a3b8;
  --text-muted: #64748b;
  --text-highlight: #38bdf8;
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-highlight: rgba(0, 242, 254, 0.4);
  --border-hot: #00d2ff;
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 9999px;
  
  --container-width: 1200px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  overflow-x: hidden;
  background: radial-gradient(circle at 50% 0%, rgba(0, 114, 255, 0.18) 0%, transparent 60%),
              radial-gradient(circle at 10% 30%, rgba(127, 83, 172, 0.12) 0%, transparent 50%),
              radial-gradient(circle at 90% 60%, rgba(0, 242, 254, 0.1) 0%, transparent 50%),
              var(--bg-main);
  min-height: 100vh;
}

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

ul, ol {
  list-style: none;
}

img, svg {
  vertical-align: middle;
  display: inline-block;
}

/* 容器 */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* 渐变高亮文字 */
.gradient-text {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

/* 导航栏 */
.header-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg-nav);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: all var(--transition-fast);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text-main);
}

.brand-icon {
  width: 34px;
  height: 34px;
  background: var(--gradient-btn);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 16px var(--primary-glow);
}

.brand-icon svg {
  width: 20px;
  height: 20px;
  fill: #fff;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-item {
  color: var(--text-sub);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.nav-item:hover {
  color: var(--primary);
}

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

/* 通用按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 1rem;
  padding: 13px 28px;
  border-radius: var(--radius-full);
  min-height: 48px;
  cursor: pointer;
  transition: all var(--transition-normal);
  text-align: center;
  border: none;
}

.btn-primary {
  background: var(--gradient-btn);
  color: #fff;
  box-shadow: 0 4px 20px rgba(0, 114, 255, 0.4);
}

.btn-primary:hover {
  background: var(--gradient-btn-hover);
  box-shadow: 0 6px 26px rgba(0, 198, 255, 0.6);
  transform: translateY(-2px);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
}

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

.btn-sm {
  padding: 8px 18px;
  font-size: 0.9rem;
  min-height: 38px;
}

.btn-block {
  width: 100%;
}

.btn-glow {
  position: relative;
  overflow: hidden;
}

.btn-glow::after {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.3) 0%, transparent 60%);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.btn-glow:hover::after {
  opacity: 1;
}

/* 主视觉区 (Hero Section) */
.hero-section {
  padding: 90px 0 70px;
  text-align: center;
  position: relative;
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  border-radius: var(--radius-full);
  background: rgba(0, 242, 254, 0.1);
  border: 1px solid rgba(0, 242, 254, 0.3);
  color: var(--primary);
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-title {
  font-size: 3.4rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -1px;
  margin-bottom: 22px;
  max-width: 960px;
  margin-left: auto;
  margin-right: auto;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-sub);
  max-width: 760px;
  margin: 0 auto 38px;
  line-height: 1.7;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-bottom: 50px;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 960px;
  margin: 0 auto;
  padding: 26px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
}

.metric-item {
  text-align: center;
  padding: 0 10px;
  border-right: 1px solid var(--border-subtle);
}

.metric-item:last-child {
  border-right: none;
}

.metric-value {
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 4px;
}

.metric-label {
  font-size: 0.88rem;
  color: var(--text-sub);
}

/* 区块通用结构 */
.section {
  padding: 90px 0;
  position: relative;
}

.section-alt {
  background: rgba(18, 26, 44, 0.4);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 60px;
}

.section-tag {
  color: var(--primary);
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.3rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 14px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-sub);
  line-height: 1.7;
}

/* 核心优势网格 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 34px 28px;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(10px);
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-highlight);
  transform: translateY(-5px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
}

.feature-icon-wrapper {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  background: rgba(0, 242, 254, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  color: var(--primary);
}

.feature-icon-wrapper svg {
  width: 28px;
  height: 28px;
  stroke: var(--primary);
  stroke-width: 2;
  fill: none;
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-main);
}

.feature-card p {
  color: var(--text-sub);
  font-size: 0.95rem;
  line-height: 1.65;
}

/* 流媒体与 AI 支持 */
.support-dual-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.support-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 38px 32px;
  backdrop-filter: blur(10px);
}

.support-panel-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.support-panel-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--gradient-btn);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  flex-shrink: 0;
}

.support-panel-icon svg {
  width: 24px;
  height: 24px;
}

.support-panel h3 {
  font-size: 1.4rem;
  font-weight: 700;
}

.support-panel p {
  color: var(--text-sub);
  font-size: 0.98rem;
  line-height: 1.7;
  margin-bottom: 26px;
}

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

.chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  padding: 7px 14px;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-main);
  transition: all var(--transition-fast);
}

.chip:hover {
  background: rgba(0, 242, 254, 0.15);
  border-color: var(--primary);
  color: #fff;
}

.chip-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #10b981;
}

/* 套餐价格对比 */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
  margin-bottom: 40px;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 38px 30px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-normal);
  backdrop-filter: blur(10px);
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-highlight);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.4);
}

.pricing-card.hot {
  background: var(--gradient-card-hot);
  border: 2px solid var(--border-hot);
  box-shadow: 0 8px 32px rgba(0, 210, 255, 0.25);
  transform: scale(1.03);
}

.pricing-card.hot:hover {
  transform: scale(1.03) translateY(-6px);
  box-shadow: 0 16px 42px rgba(0, 210, 255, 0.4);
}

.pricing-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-btn);
  color: #fff;
  padding: 4px 18px;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  box-shadow: 0 4px 12px rgba(0, 114, 255, 0.4);
}

.pricing-plan-name {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.pricing-plan-desc {
  font-size: 0.88rem;
  color: var(--text-sub);
  margin-bottom: 24px;
  min-height: 42px;
}

.pricing-price {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 28px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-subtle);
}

.price-currency {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}

.price-num {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1;
  color: var(--text-main);
}

.price-period {
  color: var(--text-sub);
  font-size: 0.95rem;
}

.pricing-features {
  flex-grow: 1;
  margin-bottom: 30px;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-sub);
  margin-bottom: 14px;
}

.pricing-features li.active {
  color: var(--text-main);
}

.pricing-features svg {
  width: 17px;
  height: 17px;
  flex-shrink: 0;
}

.check-icon {
  color: #10b981;
}

.uncheck-icon {
  color: var(--text-muted);
}

/* 套餐对比矩阵表 */
.pricing-matrix-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  margin-top: 40px;
  padding: 10px;
}

.pricing-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 680px;
}

.pricing-table th, .pricing-table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.92rem;
}

.pricing-table th {
  color: var(--text-main);
  font-weight: 700;
  background: rgba(255, 255, 255, 0.02);
}

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

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

.pricing-table td.highlight-col {
  color: var(--primary);
  font-weight: 600;
  background: rgba(0, 242, 254, 0.04);
}

/* 用户评价 */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  backdrop-filter: blur(8px);
  transition: all var(--transition-normal);
}

.testimonial-card:hover {
  border-color: var(--border-highlight);
  transform: translateY(-4px);
}

.star-rating {
  color: #f59e0b;
  font-size: 1rem;
  margin-bottom: 14px;
  display: flex;
  gap: 3px;
}

.testimonial-content {
  color: var(--text-sub);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 22px;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-btn);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
  font-size: 1rem;
  flex-shrink: 0;
}

.author-info h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
}

.author-info p {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* 常见问题 (FAQ) - 原生 details 零 JS */
.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: all var(--transition-fast);
}

.faq-item[open] {
  border-color: var(--border-highlight);
  background: var(--bg-card-hover);
}

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

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

.faq-arrow {
  width: 18px;
  height: 18px;
  color: var(--primary);
  transition: transform var(--transition-normal);
  flex-shrink: 0;
}

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

.faq-answer {
  padding: 0 24px 22px 24px;
  color: var(--text-sub);
  font-size: 0.96rem;
  line-height: 1.7;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  padding-top: 16px;
}

/* 底部行动召唤 (Bottom CTA) */
.cta-banner {
  padding: 70px 0;
}

.cta-banner-box {
  background: linear-gradient(135deg, rgba(0, 114, 255, 0.25) 0%, rgba(127, 83, 172, 0.25) 100%), var(--bg-card);
  border: 1px solid rgba(0, 242, 254, 0.3);
  border-radius: var(--radius-lg);
  padding: 56px 40px;
  text-align: center;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
}

.cta-banner-box h2 {
  font-size: 2.3rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-banner-box p {
  color: var(--text-sub);
  font-size: 1.1rem;
  max-width: 640px;
  margin: 0 auto 32px;
}

/* 页脚规范：严格仅保留四个标题，并以新窗口形式打开 */
.site-footer {
  background: #060910;
  border-top: 1px solid var(--border-subtle);
  padding: 50px 0 36px;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.footer-link {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-sub);
  transition: all var(--transition-fast);
  padding: 8px 12px;
  position: relative;
}

.footer-link:hover {
  color: var(--primary);
}

.footer-link::after {
  content: "";
  position: absolute;
  bottom: 2px;
  left: 12px;
  right: 12px;
  height: 2px;
  background: var(--primary);
  opacity: 0;
  transform: scaleX(0);
  transition: all var(--transition-fast);
}

.footer-link:hover::after {
  opacity: 1;
  transform: scaleX(1);
}

.footer-copyright {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 22px;
}

/* ==========================================================================
   单独展示页面专有样式 (关于我们 / 服务条款 / 隐私政策 / 网站地图)
   ========================================================================== */
.doc-page {
  padding: 60px 0 90px;
}

.doc-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 48px;
  margin-bottom: 40px;
  backdrop-filter: blur(12px);
}

.doc-header {
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 26px;
  margin-bottom: 34px;
}

.doc-header h1 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 10px;
}

.doc-header p {
  color: var(--text-sub);
  font-size: 0.95rem;
}

.doc-content h2 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--primary);
  margin: 36px 0 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.doc-content h2:first-of-type {
  margin-top: 0;
}

.doc-content p, .doc-content li {
  color: var(--text-sub);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 14px;
}

.doc-content ul {
  padding-left: 20px;
  margin-bottom: 20px;
}

.doc-content li {
  list-style: disc;
}

.doc-content strong {
  color: var(--text-main);
}

.doc-callout {
  background: rgba(0, 242, 254, 0.08);
  border-left: 4px solid var(--primary);
  padding: 18px 22px;
  border-radius: var(--radius-sm);
  margin: 24px 0;
}

.doc-callout-warning {
  background: rgba(239, 68, 68, 0.1);
  border-left: 4px solid #ef4444;
}

.doc-back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-sub);
  font-size: 0.95rem;
  margin-bottom: 28px;
  transition: color var(--transition-fast);
}

.doc-back-link:hover {
  color: var(--primary);
}

/* ==========================================================================
   响应式媒体查询 (@media) - 确保手机端完美单栏与超爽触控
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 2.8rem;
  }
  
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .pricing-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
  }
  
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .header-nav {
    padding: 0;
  }
  
  .nav-container {
    height: auto;
    min-height: 64px;
    padding: 10px 0;
    flex-wrap: wrap;
    gap: 8px;
  }
  
  .nav-menu {
    display: flex;
    order: 3;
    width: 100%;
    overflow-x: auto;
    padding: 6px 0 2px;
    gap: 16px;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
  }
  
  .nav-menu::-webkit-scrollbar {
    display: none;
  }
  
  .nav-item {
    font-size: 0.9rem;
    padding: 4px 6px;
  }
  
  .hero-section {
    padding: 50px 0 40px;
  }
  
  .hero-title {
    font-size: 2.1rem;
    letter-spacing: -0.5px;
  }
  
  .hero-subtitle {
    font-size: 1.05rem;
    margin-bottom: 30px;
  }
  
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
    gap: 14px;
  }
  
  .hero-cta-group .btn {
    width: 100%;
  }
  
  .hero-metrics {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    padding: 18px;
  }
  
  .metric-item {
    border-right: none;
    border-bottom: 1px solid var(--border-subtle);
    padding-bottom: 12px;
  }
  
  .metric-item:nth-child(3),
  .metric-item:nth-child(4) {
    border-bottom: none;
    padding-bottom: 0;
  }
  
  .section {
    padding: 60px 0;
  }
  
  .section-title {
    font-size: 1.8rem;
  }
  
  /* 单栏布局强制自适应 */
  .features-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }
  
  .support-dual-grid {
    grid-template-columns: 1fr;
    gap: 22px;
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
    gap: 26px;
  }
  
  .pricing-card.hot {
    transform: none;
  }
  
  .pricing-card.hot:hover {
    transform: translateY(-4px);
  }
  
  .testimonials-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }
  
  .footer-nav {
    flex-direction: column;
    gap: 16px;
  }
  
  .cta-banner-box {
    padding: 38px 20px;
  }
  
  .cta-banner-box h2 {
    font-size: 1.8rem;
  }
  
  .doc-card {
    padding: 24px 20px;
  }
  
  .btn {
    font-size: 1.02rem;
    min-height: 50px; /* 手指友好 */
  }
}