/* ==========================================================================
   星驰加速 - 极简 SaaS 风格样式表 (Linear / Stripe Minimal Aesthetic)
   配色规范：
   - 背景主色：#FFFFFF
   - 交替背景：#FAFAFA
   - 文字颜色：#111827 (深炭黑)
   - 次级文字：#4B5563 / #6B7280
   - 主强调色：#4F46E5 (Indigo 靛蓝)
   - 强调悬浮：#4338CA
   - 细线边框：#E5E7EB / rgba(0, 0, 0, 0.06)
   - 字体：Inter, -apple-system, BlinkMacSystemFont, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif
   ========================================================================== */

:root {
  --bg-primary: #FFFFFF;
  --bg-secondary: #FAFAFA;
  --bg-card: #FFFFFF;
  --text-main: #111827;
  --text-muted: #4B5563;
  --text-light: #9CA3AF;
  --primary: #4F46E5;
  --primary-hover: #4338CA;
  --primary-light: #EEF2FF;
  --primary-border: #C7D2FE;
  --border-hairline: #E5E7EB;
  --border-light: #F3F4F6;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-full: 9999px;
  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text-main);
  background-color: var(--bg-primary);
  font-size: 16px;
  line-height: 1.6;
  letter-spacing: -0.011em;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

/* 链接与按钮通用 */
a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* 布局容器 */
.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

.container-narrow {
  width: 100%;
  max-width: 860px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* 细线分割 */
.divider {
  height: 1px;
  background-color: var(--border-hairline);
  width: 100%;
  border: none;
}

/* 顶部粘性导航栏 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-hairline);
  transition: all var(--transition-fast);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.brand-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, #4F46E5 0%, #6366F1 100%);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-muted);
  position: relative;
  padding: 6px 0;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary);
  transition: width var(--transition-fast);
  border-radius: 2px;
}

.nav-link:hover {
  color: var(--text-main);
}

.nav-link:hover::after {
  width: 100%;
}

.nav-link.highlight {
  color: var(--primary);
  font-weight: 600;
}

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

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  text-align: center;
  white-space: nowrap;
  line-height: 1.2;
}

.btn-primary {
  background-color: var(--primary);
  color: #FFFFFF;
  box-shadow: 0 1px 2px rgba(79, 70, 229, 0.2);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
}

.btn-ghost {
  background-color: transparent;
  color: var(--text-main);
  border: 1px solid var(--border-hairline);
}

.btn-ghost:hover {
  background-color: var(--bg-secondary);
  border-color: #D1D5DB;
  color: var(--text-main);
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1.0625rem;
  border-radius: var(--radius-md);
}

.btn-sm {
  padding: 8px 14px;
  font-size: 0.875rem;
}

/* 汉堡菜单按钮 (移动端) */
.mobile-toggle {
  display: none;
  padding: 8px;
  border-radius: var(--radius-sm);
  color: var(--text-main);
}

/* Hero 区域 */
.hero-section {
  padding: 80px 0 60px;
  background-color: var(--bg-primary);
  text-align: center;
  position: relative;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background-color: var(--primary-light);
  border: 1px solid var(--primary-border);
  color: var(--primary);
  font-size: 0.8125rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  margin-bottom: 24px;
}

.badge-dot {
  width: 6px;
  height: 6px;
  background-color: var(--primary);
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.25rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.035em;
  color: var(--text-main);
  max-width: 920px;
  margin: 0 auto 24px;
}

.hero-title-accent {
  background: linear-gradient(135deg, #4F46E5 0%, #818CF8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: clamp(1.0625rem, 2vw, 1.25rem);
  color: var(--text-muted);
  max-width: 720px;
  margin: 0 auto 36px;
  line-height: 1.6;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

.hero-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  font-size: 0.875rem;
  color: var(--text-light);
}

.hero-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* 信任带 / Logo 矩阵 */
.trust-strip {
  padding: 32px 0;
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-hairline);
  border-bottom: 1px solid var(--border-hairline);
}

.trust-title {
  text-align: center;
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-light);
  margin-bottom: 20px;
}

.trust-badges {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  flex-wrap: wrap;
}

.trust-badge-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: #FFFFFF;
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  box-shadow: var(--shadow-sm);
}

/* 区块通用结构 */
.section {
  padding: 96px 0;
}

.section-alt {
  background-color: var(--bg-secondary);
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 56px;
}

.section-tag {
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--primary);
  margin-bottom: 12px;
  display: inline-block;
}

.section-title {
  font-size: clamp(1.875rem, 3.5vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--text-main);
  line-height: 1.25;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.0625rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 核心优势：1px细线网格 (gap-px grid technique) */
.features-grid-wrapper {
  background-color: var(--border-hairline);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
}

.feature-card {
  background-color: var(--bg-card);
  padding: 40px 32px;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  z-index: 2;
  position: relative;
}

.feature-icon-wrapper {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background-color: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.feature-desc {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

.feature-pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.feature-pill {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
}

/* 流媒体与 AI 支持图卡 */
.support-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.support-card {
  background-color: #FFFFFF;
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-lg);
  padding: 36px;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.support-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.support-card-icon {
  width: 44px;
  height: 44px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.support-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
}

.support-badge-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 20px;
}

.support-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  background-color: var(--bg-secondary);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-hairline);
}

.support-item-icon {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  font-size: 0.8125rem;
  font-weight: 700;
}

.support-item-text {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-main);
}

.support-item-sub {
  font-size: 0.75rem;
  color: var(--text-light);
}

/* 价格表区域 */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.pricing-card {
  background-color: #FFFFFF;
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.pricing-card.featured {
  border: 2px solid var(--primary);
  box-shadow: 0 8px 24px rgba(79, 70, 229, 0.12);
}

.popular-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--primary);
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.pricing-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.pricing-desc {
  font-size: 0.8125rem;
  color: var(--text-muted);
  min-height: 40px;
  margin-bottom: 20px;
}

.pricing-price-box {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-hairline);
}

.pricing-currency {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-main);
}

.pricing-num {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--text-main);
}

.pricing-period {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.pricing-features-list {
  list-style: none;
  margin-bottom: 32px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.pricing-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.check-icon {
  width: 16px;
  height: 16px;
  color: var(--primary);
  flex-shrink: 0;
  margin-top: 3px;
}

/* 用户评价 */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background-color: #FFFFFF;
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.stars {
  display: flex;
  gap: 4px;
  color: #F59E0B;
  margin-bottom: 16px;
}

.review-text {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  font-style: normal;
}

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

.author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-secondary);
  border: 1px solid var(--border-hairline);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.875rem;
  color: var(--primary);
}

.author-name {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text-main);
}

.author-tag {
  font-size: 0.75rem;
  color: var(--text-light);
}

/* FAQ 常见问题 */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background-color: #FFFFFF;
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item:hover {
  border-color: #D1D5DB;
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 20px 24px;
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: transparent;
}

.faq-icon {
  width: 20px;
  height: 20px;
  color: var(--text-light);
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
  color: var(--primary);
}

.faq-answer {
  padding: 0 24px 20px;
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.65;
  display: none;
}

.faq-item.active .faq-answer {
  display: block;
}

/* 底部行动号召 */
.cta-banner {
  background: linear-gradient(135deg, #4F46E5 0%, #4338CA 100%);
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  text-align: center;
  color: #FFFFFF;
  margin-top: 40px;
}

.cta-banner-title {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.cta-banner-desc {
  font-size: 1.0625rem;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto 28px;
}

.cta-banner .btn-primary {
  background-color: #FFFFFF;
  color: var(--primary);
}

.cta-banner .btn-primary:hover {
  background-color: #F9FAFB;
  transform: translateY(-2px);
}

/* ==========================================================================
   页脚样式规范：4个核心栏目精细排版 (Linear / Stripe Minimal 4-Column Layout)
   严格只保留 4 个标题：网站地图、关于我们、服务条款、隐私政策
   ========================================================================== */
.site-footer {
  background-color: #FFFFFF;
  border-top: 1px solid var(--border-hairline);
  padding: 64px 0 36px;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 36px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--border-hairline);
}

.footer-col {
  display: flex;
  flex-direction: column;
}

.footer-title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.015em;
  margin-bottom: 18px;
  display: flex;
  align-items: center;
}

.footer-title a {
  color: var(--text-main);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color var(--transition-fast);
}

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

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links li a {
  font-size: 0.9375rem;
  color: var(--text-muted);
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.footer-links li a:hover {
  color: var(--primary);
  transform: translateX(3px);
}

.footer-bottom {
  padding-top: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-copy {
  font-size: 0.875rem;
  color: var(--text-light);
}

.footer-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* 资讯与子页面通用排版 */
.page-hero {
  padding: 64px 0 40px;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-hairline);
  text-align: center;
}

.article-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-top: 40px;
}

.article-card {
  background-color: #FFFFFF;
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.article-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: #CBD5E1;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.8125rem;
  color: var(--text-light);
  margin-bottom: 12px;
}

.article-title {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 14px;
  letter-spacing: -0.015em;
  line-height: 1.35;
}

.article-excerpt {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 18px;
}

.article-content-body {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.75;
  padding-top: 16px;
  border-top: 1px dashed var(--border-hairline);
}

.article-content-body h3, .article-content-body h4 {
  color: var(--text-main);
  margin: 16px 0 8px;
}

.article-content-body p {
  margin-bottom: 12px;
}

.article-content-body ul {
  margin-left: 20px;
  margin-bottom: 12px;
}

.article-link-inline {
  color: var(--primary);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

/* 静态内容页排版 (关于我们, 服务条款, 隐私政策) */
.legal-content {
  background-color: #FFFFFF;
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-lg);
  padding: 48px;
  margin: 40px auto 80px;
}

.legal-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main);
  margin-top: 32px;
  margin-bottom: 14px;
  letter-spacing: -0.02em;
}

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

.legal-content p {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 16px;
}

.legal-content ul {
  margin-left: 20px;
  margin-bottom: 16px;
  color: var(--text-muted);
  font-size: 0.9375rem;
  line-height: 1.75;
}

/* ==========================================================================
   页面元素展示机制：确保所有页面内容 100% 默认完全可见，杜绝任何空白问题
   ========================================================================== */
.fade-up {
  opacity: 1 !important;
  transform: none !important;
  visibility: visible !important;
  transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}

/* 仅当浏览器支持 IntersectionObserver 且页面完成加载时，赋予优雅入场微动效 */
html.js-enhanced .fade-up-ready {
  opacity: 0 !important;
  transform: translateY(16px) !important;
}

html.js-enhanced .fade-up-ready.visible {
  opacity: 1 !important;
  transform: translateY(0) !important;
}

/* ==========================================================================
   响应式媒体查询 (@media) - 确保手机端完美单栏与大触控区域
   ========================================================================== */
@media (max-width: 1024px) {
  .features-grid-wrapper {
    grid-template-columns: 1fr;
  }
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .site-header {
    height: auto;
  }
  .nav-wrapper {
    height: 60px;
  }
  
  .mobile-toggle {
    display: block;
  }

  .nav-menu {
    display: none;
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    padding: 16px 0;
    gap: 16px;
    border-top: 1px solid var(--border-hairline);
  }

  .nav-menu.open {
    display: flex;
  }

  .nav-actions {
    display: none;
  }

  .hero-section {
    padding: 48px 0 40px;
  }

  .hero-title {
    font-size: 2.25rem;
  }

  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }

  .hero-cta-group .btn {
    width: 100%;
    padding: 14px 20px;
  }

  .support-grid {
    grid-template-columns: 1fr;
  }

  .support-badge-list {
    grid-template-columns: 1fr;
  }

  .pricing-grid {
    grid-template-columns: 1fr;
  }

  .reviews-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .legal-content {
    padding: 24px 16px;
  }
}

/* 面包屑与索引导航 */
.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--text-light);
  margin-bottom: 16px;
}

.breadcrumb-nav a {
  color: var(--primary);
  font-weight: 500;
}

.breadcrumb-nav a:hover {
  text-decoration: underline;
}

.quick-toc-box {
  background: #FFFFFF;
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 32px;
}

.quick-toc-title {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.quick-toc-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}