/* ==========================================================================
   花云机场 (flowercloud) - 极简现代化极白高转化原生 CSS 样式表
   主题：极白纯净 (Pure Minimalist White)
   规范：纯原生 CSS，零重型外部依赖，极速秒开，完美响应式，无障碍支持
   ========================================================================== */

:root {
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-light: #eff6ff;
  --color-accent: #ea580c;
  --color-accent-hover: #c2410c;
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-card-bg: #ffffff;
  --color-card-border: #e2e8f0;
  --color-card-hover-border: #93c5fd;
  --color-text-main: #0f172a;
  --color-text-body: #334155;
  --color-text-muted: #64748b;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  --border-radius-sm: 6px;
  --border-radius-md: 12px;
  --border-radius-lg: 16px;
  --border-radius-full: 9999px;
  --container-max-width: 1200px;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --header-height: 72px;
  --transition-fast: 0.2s ease;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.06), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 0 25px rgba(37, 99, 235, 0.15);
}

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

html {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text-main);
  background-color: var(--color-bg);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-color: #ffffff;
  color: var(--color-text-main);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* 键盘可访问性：跳至主要内容 */
.skip-link {
  position: absolute;
  top: -999px;
  left: 20px;
  background: var(--color-accent);
  color: #ffffff;
  padding: 12px 20px;
  z-index: 9999;
  border-radius: var(--border-radius-sm);
  font-weight: 700;
  text-decoration: none;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 20px;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

a:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

/* 锚点滚动留白，防止被固定导航栏遮挡 */
section[id], div[id] {
  scroll-margin-top: calc(var(--header-height) + 24px);
}

/* ==========================================================================
   页眉与导航 (极白纯净风)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-card-border);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.03);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 800;
  color: #0f172a;
  text-decoration: none;
  letter-spacing: -0.5px;
}

.brand-icon {
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 900;
  font-size: 18px;
}

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

.nav-link {
  color: #475569;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}

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

.nav-link.highlight {
  color: var(--color-accent);
  font-weight: 700;
}

.header-cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover));
  color: #ffffff;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--border-radius-full);
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.header-cta-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
  color: #ffffff;
}

/* ==========================================================================
   按钮标准规范 (触控区域 >= 44x44px)
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  min-width: 44px;
  padding: 12px 28px;
  font-size: 1rem;
  font-weight: 700;
  border-radius: var(--border-radius-md);
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all var(--transition-fast);
  text-align: center;
}

.btn-primary {
  background: linear-gradient(135deg, #f97316, #ea580c);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(234, 88, 12, 0.25);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #fb923c, #f97316);
  box-shadow: 0 6px 20px rgba(234, 88, 12, 0.4);
  transform: translateY(-2px);
  color: #ffffff;
}

.btn-secondary {
  background: #ffffff;
  color: #1e293b;
  border: 1px solid var(--color-card-border);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.btn-secondary:hover {
  background: #f8fafc;
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
}

.btn-block {
  width: 100%;
}

/* ==========================================================================
   主视觉区 (Hero Section) - 极白背景与柔和光晕
   ========================================================================== */
.hero-section {
  padding: 80px 0 60px;
  text-align: center;
  position: relative;
  background: radial-gradient(circle at 50% 20%, #eff6ff 0%, #ffffff 70%);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: var(--border-radius-full);
  color: #1d4ed8;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  background-color: var(--color-success);
  border-radius: 50%;
  box-shadow: 0 0 8px rgba(16, 185, 129, 0.6);
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -1px;
  color: #0f172a;
  margin-bottom: 20px;
}

.hero-title-highlight {
  background: linear-gradient(135deg, #1d4ed8 0%, #ea580c 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--color-text-muted);
  max-width: 820px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 900px;
  margin: 0 auto;
  padding: 24px;
  background: #ffffff;
  border: 1px solid var(--color-card-border);
  border-radius: var(--border-radius-lg);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

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

.metric-number {
  font-size: 1.85rem;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 4px;
}

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

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

/* ==========================================================================
   通用板块标题
   ========================================================================== */
.section {
  padding: 70px 0;
  background-color: #ffffff;
}

.section-alt {
  background-color: #f8fafc;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 48px;
}

.section-tag {
  display: inline-block;
  color: var(--color-accent);
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 800;
  color: #0f172a;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ==========================================================================
   套餐价格表 (Pricing Table)
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-card {
  position: relative;
  background: #ffffff;
  border: 1px solid var(--color-card-border);
  border-radius: var(--border-radius-lg);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-primary);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.12);
}

.pricing-card.featured {
  border-color: var(--color-accent);
  background: #ffffff;
  box-shadow: 0 8px 30px rgba(234, 88, 12, 0.12);
}

.pricing-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-hover));
  color: #ffffff;
  padding: 4px 16px;
  font-size: 0.8rem;
  font-weight: 800;
  border-radius: var(--border-radius-full);
  letter-spacing: 0.5px;
  white-space: nowrap;
  box-shadow: 0 2px 8px rgba(234, 88, 12, 0.3);
}

.plan-name {
  font-size: 1.4rem;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 8px;
}

.plan-desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  min-height: 42px;
  margin-bottom: 20px;
}

.plan-price-box {
  display: flex;
  align-items: baseline;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-card-border);
}

.currency {
  font-size: 1.5rem;
  font-weight: 700;
  color: #0f172a;
  margin-right: 4px;
}

.amount {
  font-size: 2.75rem;
  font-weight: 900;
  color: #0f172a;
  line-height: 1;
}

.period {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-left: 6px;
}

.plan-features {
  list-style: none;
  margin-bottom: 32px;
  flex-grow: 1;
}

.plan-features li {
  font-size: 0.92rem;
  color: var(--color-text-body);
  margin-bottom: 12px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.plan-features li::before {
  content: "✓";
  color: var(--color-success);
  font-weight: 900;
}

.pricing-table-container {
  margin-top: 48px;
  overflow-x: auto;
  border-radius: var(--border-radius-md);
  border: 1px solid var(--color-card-border);
  background: #ffffff;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}

.pricing-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
}

.pricing-table caption {
  padding: 16px;
  font-size: 1rem;
  font-weight: 700;
  color: #334155;
  caption-side: top;
  text-align: left;
  background: #f8fafc;
  border-bottom: 1px solid var(--color-card-border);
}

.pricing-table th, .pricing-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--color-card-border);
}

.pricing-table th {
  background: #f1f5f9;
  color: #0f172a;
  font-weight: 700;
}

.pricing-table td {
  color: #334155;
}

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

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

.feature-card {
  background: #ffffff;
  border: 1px solid var(--color-card-border);
  border-radius: var(--border-radius-lg);
  padding: 36px 28px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-primary);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.1);
}

.feature-icon-box {
  width: 56px;
  height: 56px;
  border-radius: var(--border-radius-md);
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  margin-bottom: 24px;
}

.feature-title {
  font-size: 1.3rem;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 12px;
}

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

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

.media-ai-card {
  background: #ffffff;
  border: 1px solid var(--color-card-border);
  border-radius: var(--border-radius-lg);
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}

.media-ai-card-title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 16px;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.tech-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: #f8fafc;
  border: 1px solid var(--color-card-border);
  border-radius: var(--border-radius-sm);
  font-size: 0.875rem;
  color: #334155;
  font-weight: 600;
}

.tech-tag.active {
  border-color: #bfdbfe;
  background: #eff6ff;
  color: #1d4ed8;
}

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

.review-card {
  background: #ffffff;
  border: 1px solid var(--color-card-border);
  border-radius: var(--border-radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}

.review-stars {
  color: #f59e0b;
  font-size: 1.1rem;
  margin-bottom: 14px;
  letter-spacing: 2px;
}

.review-comment {
  font-size: 0.95rem;
  color: var(--color-text-body);
  line-height: 1.6;
  margin-bottom: 20px;
}

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

.author-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, #2563eb, #ea580c);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 700;
  font-size: 1rem;
}

.author-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: #0f172a;
}

.author-title {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* ==========================================================================
   常见问题解答 (FAQ) - 原生 details/summary，默认展开
   ========================================================================== */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: #ffffff;
  border: 1px solid var(--color-card-border);
  border-radius: var(--border-radius-md);
  overflow: hidden;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.03);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.faq-item[open] {
  border-color: #93c5fd;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.06);
}

.faq-summary {
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: #0f172a;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

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

.faq-summary::after {
  content: "▾";
  font-size: 1.2rem;
  color: var(--color-accent);
  transition: transform var(--transition-fast);
}

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

.faq-content {
  padding: 0 24px 20px 24px;
  font-size: 0.95rem;
  color: var(--color-text-body);
  line-height: 1.7;
  border-top: 1px solid #f1f5f9;
}

.faq-content p {
  margin-top: 12px;
}

.faq-content a {
  color: var(--color-primary);
  text-decoration: underline;
}

/* ==========================================================================
   底部行动号召 (CTA Box)
   ========================================================================== */
.article-cta-box {
  background: linear-gradient(135deg, #f8fafc 0%, #eff6ff 100%);
  border: 1px solid #bfdbfe;
  border-radius: var(--border-radius-lg);
  padding: 36px 32px;
  text-align: center;
  margin: 48px auto;
  box-shadow: 0 4px 20px rgba(37, 99, 235, 0.06);
}

.article-cta-box h2, .article-cta-box h3 {
  font-size: 1.8rem;
  color: #0f172a;
  margin-bottom: 12px;
  font-weight: 800;
}

.article-cta-box p {
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto 24px;
  font-size: 1.05rem;
}

/* ==========================================================================
   页脚 (Footer) - 极白淡雅风
   ========================================================================== */
.site-footer {
  margin-top: auto;
  background: #f8fafc;
  border-top: 1px solid var(--color-card-border);
  padding: 48px 0 32px;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  list-style: none;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.footer-link {
  color: #334155;
  font-size: 1rem;
  font-weight: 600;
  padding: 8px 12px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  transition: color var(--transition-fast);
}

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

.footer-copyright {
  text-align: center;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* ==========================================================================
   知识科普与文章页专属样式
   ========================================================================== */
.article-hub-header {
  padding: 60px 0 40px;
  text-align: center;
  background: radial-gradient(circle at 50% 20%, #eff6ff 0%, #ffffff 70%);
  border-bottom: 1px solid var(--color-card-border);
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin: 48px 0;
}

.article-card {
  background: #ffffff;
  border: 1px solid var(--color-card-border);
  border-radius: var(--border-radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-primary);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.1);
}

.article-tag {
  display: inline-block;
  align-self: flex-start;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-accent);
  background: #fff7ed;
  border: 1px solid #fed7aa;
  padding: 4px 10px;
  border-radius: var(--border-radius-sm);
  margin-bottom: 14px;
}

.article-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #0f172a;
  line-height: 1.45;
  margin-bottom: 12px;
}

.article-card-title a {
  color: #0f172a;
}

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

.article-card-desc {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-card-meta {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  border-top: 1px solid #f1f5f9;
  padding-top: 14px;
  display: flex;
  justify-content: space-between;
}

/* 单篇文章正文排版 */
.article-container {
  max-width: 820px;
  margin: 0 auto;
  padding: 48px 20px 80px;
  background-color: #ffffff;
}

.article-header {
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-card-border);
}

.article-header h1 {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 800;
  color: #0f172a;
  line-height: 1.35;
  margin-bottom: 16px;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 20px;
  color: var(--color-text-muted);
  font-size: 0.88rem;
}

.article-body {
  font-size: 1.05rem;
  line-height: 1.85;
  color: #334155;
}

.article-body h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: #0f172a;
  margin: 36px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-card-border);
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: #1e293b;
  margin: 28px 0 12px;
}

.article-body p {
  margin-bottom: 20px;
}

.article-body ul, .article-body ol {
  margin: 16px 0 24px 24px;
}

.article-body li {
  margin-bottom: 8px;
}

.article-body strong {
  color: #0f172a;
}

.article-body blockquote {
  border-left: 4px solid var(--color-primary);
  background: #f8fafc;
  padding: 16px 20px;
  border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
  margin: 24px 0;
  color: #334155;
}

.article-body a {
  color: var(--color-primary);
  text-decoration: underline;
}

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

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }
  
  .site-header .container {
    padding-left: 16px;
    padding-right: 16px;
  }
  
  .nav-menu {
    display: none;
  }
  
  .hero-section {
    padding: 48px 0 40px;
  }
  
  .hero-metrics {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    padding: 16px;
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .media-ai-container {
    grid-template-columns: 1fr;
  }
  
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  
  .articles-grid {
    grid-template-columns: 1fr;
  }
  
  .btn {
    width: 100%;
    min-height: 48px;
  }
  
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  
  .footer-nav {
    flex-direction: column;
    gap: 16px;
  }
}

@media (max-width: 390px) {
  .hero-title {
    font-size: 1.75rem;
  }
  .metric-number {
    font-size: 1.5rem;
  }
}