/* ==========================================================================
   蓝海云 (LanHai Cloud) - 官方现代化响应式样式表
   纯原生 CSS，零重型外部依赖，秒开性能优化
   ========================================================================== */

:root {
  --bg-dark: #020617;
  --bg-gradient-end: #0c4a6e;
  --card-bg: rgba(15, 23, 42, 0.75);
  --card-border: rgba(56, 189, 248, 0.2);
  --card-hover-border: rgba(56, 189, 248, 0.6);
  --cyan-primary: #38bdf8;
  --cyan-glow: rgba(56, 189, 248, 0.35);
  --cyan-dark: #0284c7;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-light: #cbd5e1;
  --accent-gold: #f59e0b;
  --accent-green: #10b981;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --font-heading: "Chakra Petch", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --container-max: 1200px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-dark);
  color: var(--text-main);
}

body {
  font-family: var(--font-body);
  line-height: 1.6;
  background-color: var(--bg-dark);
  color: var(--text-main);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

/* 导航栏 */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(2, 6, 23, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(56, 189, 248, 0.15);
  transition: all var(--transition-normal);
}

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

.logo-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-main);
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: 0.5px;
}

.logo-icon {
  width: 32px;
  height: 32px;
  color: var(--cyan-primary);
  filter: drop-shadow(0 0 8px var(--cyan-glow));
}

.logo-text-en {
  font-size: 0.75rem;
  color: var(--cyan-primary);
  font-weight: 500;
  letter-spacing: 1.5px;
  text-transform: uppercase;
}

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

.nav-link {
  color: var(--text-light);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
  padding: 6px 0;
}

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

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

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

.nav-badge-hot {
  display: inline-block;
  background: linear-gradient(135deg, #ef4444, #f97316);
  color: #fff;
  font-size: 0.65rem;
  padding: 1px 6px;
  border-radius: 10px;
  margin-left: 4px;
  vertical-align: middle;
}

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

/* 按钮通用规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: 1px solid transparent;
  min-height: 44px;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #0284c7, #38bdf8);
  color: #020617;
  font-weight: 700;
  box-shadow: 0 0 15px var(--cyan-glow);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #38bdf8, #7dd3fc);
  box-shadow: 0 0 25px rgba(56, 189, 248, 0.6);
  transform: translateY(-2px);
  color: #020617;
}

.btn-outline-cyan {
  background: rgba(12, 74, 110, 0.25);
  color: var(--cyan-primary);
  border: 1px solid var(--cyan-primary);
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.2);
}

.btn-outline-cyan:hover {
  background: var(--cyan-primary);
  color: #020617;
  box-shadow: 0 0 24px rgba(56, 189, 248, 0.55);
  transform: translateY(-2px);
}

.btn-blog-dofollow {
  background: rgba(30, 41, 59, 0.7);
  color: #e2e8f0;
  border: 1px solid rgba(148, 163, 184, 0.35);
  position: relative;
  overflow: hidden;
}

.btn-blog-dofollow:hover {
  background: rgba(51, 65, 85, 0.9);
  color: #38bdf8;
  border-color: var(--cyan-primary);
  box-shadow: 0 0 18px rgba(56, 189, 248, 0.3);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.85rem;
  min-height: 36px;
}

.btn-lg {
  padding: 14px 30px;
  font-size: 1.05rem;
  min-height: 52px;
}

.mobile-menu-btn {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-main);
  cursor: pointer;
  padding: 8px;
}

/* ==========================================================================
   Hero 区域与粒子海洋全屏画布
   ========================================================================== */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: radial-gradient(circle at 50% 30%, #0c4a6e 0%, #020617 70%);
  overflow: hidden;
  padding-top: 80px;
}

#particle-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: auto;
}

.hero-content-wrapper {
  position: relative;
  z-index: 2;
  width: 100%;
  padding-top: 40px;
  padding-bottom: 70px;
  pointer-events: none; /* 保证鼠标事件穿透给底下的 Canvas */
}

.hero-text-card {
  max-width: 820px;
  pointer-events: none;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-heading);
  font-size: 0.85rem;
  letter-spacing: 2px;
  color: var(--cyan-primary);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.3);
  padding: 6px 16px;
  border-radius: 30px;
  margin-bottom: 24px;
  text-transform: uppercase;
  pointer-events: auto;
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.15);
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan-primary);
  box-shadow: 0 0 8px var(--cyan-primary);
  animation: pulseGlow 2s infinite;
}

@keyframes pulseGlow {
  0% { transform: scale(0.9); opacity: 0.7; }
  50% { transform: scale(1.3); opacity: 1; }
  100% { transform: scale(0.9); opacity: 0.7; }
}

.hero-headline {
  font-family: var(--font-heading);
  font-size: clamp(2.4rem, 5.2vw, 4.2rem);
  font-weight: 800;
  line-height: 1.15;
  color: #ffffff;
  margin-bottom: 22px;
  letter-spacing: -0.5px;
  text-shadow: 0 0 35px rgba(56, 189, 248, 0.3);
  pointer-events: auto;
}

.hero-subcopy {
  font-size: 1.15rem;
  line-height: 1.8;
  color: var(--text-light);
  margin-bottom: 34px;
  max-width: 680px;
  pointer-events: auto;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 40px;
  pointer-events: auto;
}

.hero-badges-row {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  padding-top: 10px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  pointer-events: auto;
}

.hero-mini-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.hero-mini-badge svg {
  color: var(--cyan-primary);
}

.mouse-hint {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  color: rgba(56, 189, 248, 0.75);
  font-size: 0.75rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  pointer-events: none;
  animation: floatBounce 2.5s infinite ease-in-out;
}

@keyframes floatBounce {
  0%, 100% { transform: translate(-50%, 0); }
  50% { transform: translate(-50%, -8px); }
}

/* ==========================================================================
   通用的模块布局与标题
   ========================================================================== */
.section-padding {
  padding: 100px 0;
  position: relative;
}

.section-padding-sm {
  padding: 60px 0;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 60px;
}

.section-subtitle {
  display: inline-block;
  color: var(--cyan-primary);
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 3.2vw, 2.5rem);
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

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

/* 卡片玻璃态样式 */
.glass-card {
  background: var(--card-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 32px;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.glass-card:hover {
  border-color: var(--card-hover-border);
  box-shadow: 0 10px 30px rgba(56, 189, 248, 0.12);
  transform: translateY(-4px);
}

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

.feature-card {
  display: flex;
  flex-direction: column;
}

.feature-icon-wrapper {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cyan-primary);
  margin-bottom: 22px;
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.15);
}

.feature-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 14px;
}

.feature-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 20px;
  flex-grow: 1;
}

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

.pill-tag {
  font-size: 0.78rem;
  color: var(--cyan-primary);
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.2);
  padding: 4px 10px;
  border-radius: 20px;
}

/* ==========================================================================
   流媒体与AI支持卡片
   ========================================================================== */
.media-ai-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
}

.media-ai-card {
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 36px;
  position: relative;
}

.card-category-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 20px;
}

.badge-purple {
  background: rgba(168, 85, 247, 0.15);
  color: #c084fc;
  border: 1px solid rgba(168, 85, 247, 0.35);
}

.badge-cyan {
  background: rgba(56, 189, 248, 0.15);
  color: #38bdf8;
  border: 1px solid rgba(56, 189, 248, 0.35);
}

.media-ai-title {
  font-size: 1.5rem;
  color: #fff;
  margin-bottom: 14px;
}

.media-ai-desc {
  font-size: 0.96rem;
  color: var(--text-muted);
  margin-bottom: 26px;
  line-height: 1.7;
}

.service-logo-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.service-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(30, 41, 59, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.06);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.service-item:hover {
  background: rgba(56, 189, 248, 0.1);
  border-color: rgba(56, 189, 248, 0.3);
}

.service-icon {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
}

.service-name {
  font-weight: 600;
  font-size: 0.95rem;
  color: #e2e8f0;
}

.service-status {
  margin-left: auto;
  font-size: 0.72rem;
  color: var(--accent-green);
  display: flex;
  align-items: center;
  gap: 4px;
}

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

.pricing-card {
  display: flex;
  flex-direction: column;
  position: relative;
  background: rgba(15, 23, 42, 0.75);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 38px 28px;
  transition: all var(--transition-normal);
}

.pricing-card.featured {
  background: linear-gradient(180deg, rgba(14, 116, 144, 0.25) 0%, rgba(15, 23, 42, 0.9) 100%);
  border: 2px solid var(--cyan-primary);
  box-shadow: 0 0 35px rgba(56, 189, 248, 0.25);
  transform: translateY(-8px);
}

.pricing-ribbon {
  position: absolute;
  top: 14px;
  right: 18px;
  background: linear-gradient(135deg, #0284c7, #38bdf8);
  color: #020617;
  font-size: 0.72rem;
  font-weight: 800;
  padding: 4px 12px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

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

.plan-intro {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.price-box {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin-bottom: 26px;
  padding-bottom: 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.price-currency {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--cyan-primary);
}

.price-amount {
  font-size: 3rem;
  font-weight: 800;
  color: #fff;
  line-height: 1;
}

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

.plan-features-list {
  list-style: none;
  margin-bottom: 34px;
  flex-grow: 1;
}

.plan-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-light);
  margin-bottom: 14px;
}

.plan-feature-item svg {
  color: var(--accent-green);
  flex-shrink: 0;
}

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

.review-card {
  display: flex;
  flex-direction: column;
}

.stars-row {
  display: flex;
  gap: 4px;
  color: var(--accent-gold);
  margin-bottom: 14px;
}

.review-text {
  font-size: 0.95rem;
  color: var(--text-light);
  line-height: 1.7;
  margin-bottom: 20px;
  flex-grow: 1;
  font-style: italic;
}

.reviewer-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 14px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.reviewer-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, #0284c7, #38bdf8);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #020617;
  font-size: 1.05rem;
}

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

.reviewer-role {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ==========================================================================
   常见问题解答 (FAQ)
   ========================================================================== */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: all var(--transition-fast);
}

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

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

.faq-item summary::after {
  content: "+";
  font-size: 1.5rem;
  color: var(--cyan-primary);
  transition: transform var(--transition-fast);
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 24px 22px 24px;
  color: var(--text-light);
  font-size: 0.95rem;
  line-height: 1.75;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  margin-top: 6px;
  padding-top: 16px;
}

/* ==========================================================================
   极简页脚 (严格遵循用户需求：仅保留四个标题打开新页面)
   ========================================================================== */
.site-footer {
  background: #01040f;
  border-top: 1px solid rgba(56, 189, 248, 0.15);
  padding: 48px 0 36px 0;
  margin-top: 80px;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  list-style: none;
  flex-wrap: wrap;
}

.footer-link {
  color: var(--text-light);
  text-decoration: none;
  font-size: 1.02rem;
  font-weight: 500;
  transition: all var(--transition-fast);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
}

.footer-link:hover {
  color: var(--cyan-primary);
  background: rgba(56, 189, 248, 0.08);
}

.footer-copy {
  color: var(--text-muted);
  font-size: 0.85rem;
  text-align: center;
}

/* ==========================================================================
   资讯/文章页样式 (news-insights.html)
   ========================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
}

.article-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 32px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

.article-card:hover {
  border-color: var(--cyan-primary);
  box-shadow: 0 10px 30px rgba(56, 189, 248, 0.15);
  transform: translateY(-3px);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.article-tag {
  background: rgba(56, 189, 248, 0.12);
  color: var(--cyan-primary);
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
}

.article-title {
  font-size: 1.35rem;
  color: #fff;
  line-height: 1.45;
  margin-bottom: 14px;
  font-weight: 700;
}

.article-excerpt {
  color: var(--text-light);
  font-size: 0.94rem;
  line-height: 1.75;
  margin-bottom: 22px;
  flex-grow: 1;
}

.article-body-content {
  background: rgba(2, 6, 23, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-sm);
  padding: 20px;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--text-light);
  margin-top: 14px;
}

.article-body-content a {
  color: var(--cyan-primary);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--transition-fast);
}

.article-body-content a:hover {
  color: #7dd3fc;
}

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

.article-body-content h4 {
  color: #fff;
  margin: 16px 0 8px 0;
  font-size: 1.05rem;
}

/* ==========================================================================
   二级单页文章与内容展示通用 (about, terms, privacy, sitemap)
   ========================================================================== */
.page-hero {
  padding: 130px 0 50px 0;
  background: linear-gradient(180deg, #0c4a6e 0%, #020617 100%);
  border-bottom: 1px solid rgba(56, 189, 248, 0.15);
  text-align: center;
}

.page-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
}

.page-intro {
  font-size: 1.1rem;
  color: var(--text-light);
  max-width: 680px;
  margin: 0 auto;
}

.doc-content-box {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 48px;
  margin-top: 40px;
  margin-bottom: 60px;
  line-height: 1.85;
}

.doc-content-box h2 {
  font-size: 1.6rem;
  color: #fff;
  margin: 36px 0 16px 0;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(56, 189, 248, 0.2);
}

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

.doc-content-box h3 {
  font-size: 1.25rem;
  color: var(--cyan-primary);
  margin: 24px 0 12px 0;
}

.doc-content-box p {
  color: var(--text-light);
  margin-bottom: 16px;
  font-size: 1rem;
}

.doc-content-box ul,
.doc-content-box ol {
  padding-left: 24px;
  margin-bottom: 20px;
  color: var(--text-light);
}

.doc-content-box li {
  margin-bottom: 8px;
}

.highlight-box {
  background: rgba(56, 189, 248, 0.08);
  border-left: 4px solid var(--cyan-primary);
  padding: 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
}

/* ==========================================================================
   响应式媒体查询 (@media)
   确保在手机端完美单栏显示，按钮适合手指点击
   ========================================================================== */
@media (max-width: 1024px) {
  .features-grid,
  .pricing-grid,
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .pricing-card.featured {
    transform: none;
  }
}

@media (max-width: 768px) {
  .site-header {
    height: 64px;
  }
  
  .nav-wrapper {
    height: 64px;
  }

  .mobile-menu-btn {
    display: block;
  }

  .nav-menu {
    position: fixed;
    top: 64px;
    left: 0;
    width: 100%;
    background: #020617;
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid rgba(56, 189, 248, 0.2);
    display: none;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.8);
  }

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

  .hero-section {
    padding-top: 70px;
    min-height: auto;
  }

  .hero-headline {
    font-size: 2.1rem;
  }

  .hero-subcopy {
    font-size: 1rem;
  }

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

  .hero-actions .btn {
    width: 100%;
  }

  .features-grid,
  .media-ai-container,
  .pricing-grid,
  .reviews-grid,
  .articles-grid {
    grid-template-columns: 1fr;
  }

  .service-logo-grid {
    grid-template-columns: 1fr;
  }

  .doc-content-box {
    padding: 26px 18px;
  }

  .footer-nav {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }

  .btn {
    min-height: 48px; /* 移动端更利于手指触碰 */
    font-size: 1rem;
  }
}