/* ==========================================================================
   自由猫 FreeCat - 现代化纯原生 CSS 样式表 (清爽浅色主题 Light Theme)
   零外部依赖 | 极速秒开 | 移动端优先响应式
   ========================================================================== */

:root {
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-glow: rgba(79, 70, 229, 0.2);
  --accent-cyan: #0284c7;
  --accent-purple: #7c3aed;
  --accent-green: #059669;
  --accent-amber: #d97706;
  
  --bg-page: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #ffffff;
  --bg-card-subtle: #f1f5f9;
  --border-color: #e2e8f0;
  --border-hover: #cbd5e1;
  --border-glow: rgba(79, 70, 229, 0.35);

  --text-main: #0f172a;
  --text-body: #334155;
  --text-muted: #64748b;
  --text-dim: #94a3b8;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-card: 0 4px 20px -2px rgba(15, 23, 42, 0.06), 0 2px 6px -1px rgba(15, 23, 42, 0.04);
  --shadow-card-hover: 0 12px 30px -4px rgba(15, 23, 42, 0.1), 0 4px 10px -2px rgba(15, 23, 42, 0.05);
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  background-color: var(--bg-page);
  color: var(--text-main);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  line-height: 1.6;
  background-color: var(--bg-page);
  background-image: 
    radial-gradient(at 100% 0%, rgba(224, 231, 255, 0.5) 0px, transparent 50%),
    radial-gradient(at 0% 50%, rgba(240, 249, 255, 0.8) 0px, transparent 50%),
    radial-gradient(at 100% 100%, rgba(243, 232, 255, 0.4) 0px, transparent 50%);
  min-height: 100vh;
  overflow-x: hidden;
  color: var(--text-body);
}

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

ul, ol {
  list-style: none;
}

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

/* 布局容器 */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

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

.gradient-text {
  background: linear-gradient(135deg, #4f46e5 0%, #0284c7 50%, #7c3aed 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

/* 顶部导航栏 (清爽毛玻璃浅色) */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(255, 255, 255, 0.85);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 0;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.02);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text-main);
}

.brand-logo .logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary), #0284c7);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 4px 12px var(--primary-glow);
}

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

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

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* 按钮通用规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-normal);
  border: 1px solid transparent;
  white-space: nowrap;
  user-select: none;
  text-decoration: none;
  min-height: 44px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, #4338ca 100%);
  color: #ffffff !important;
  box-shadow: 0 4px 16px rgba(79, 70, 229, 0.3);
  border-color: transparent;
}

.btn-primary:hover {
  background: linear-gradient(135deg, #4338ca 0%, #3730a3 100%);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(79, 70, 229, 0.4);
  color: #ffffff !important;
}

.btn-secondary {
  background: #ffffff;
  color: var(--text-main);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: #f8fafc;
  border-color: #cbd5e1;
  color: var(--primary);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 8px 20px;
  font-size: 0.875rem;
  min-height: 38px;
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.125rem;
  min-height: 52px;
}

.btn-block {
  width: 100%;
}

/* 区域通用样式 */
section {
  padding: 80px 0;
  position: relative;
}

.section-header {
  margin-bottom: 52px;
  text-align: center;
}

.section-tag {
  display: inline-block;
  padding: 6px 16px;
  background: #eef2ff;
  border: 1px solid #c7d2fe;
  color: var(--primary);
  border-radius: var(--radius-full);
  font-size: 0.825rem;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: 0.8px;
  text-transform: uppercase;
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
  color: var(--text-main);
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto;
}

/* 1. 主视觉区 (Hero Section) */
.hero-section {
  padding: 80px 0 70px;
  text-align: center;
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 22px;
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 500;
  color: #334155;
  margin-bottom: 28px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
}

.hero-badge .pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-green);
  border-radius: 50%;
  box-shadow: 0 0 0 3px rgba(5, 150, 105, 0.2);
}

.hero-title {
  font-size: 3.4rem;
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -1.2px;
  margin-bottom: 22px;
  color: var(--text-main);
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-muted);
  max-width: 780px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.hero-image-card {
  max-width: 960px;
  margin: 0 auto 44px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 48px -10px rgba(79, 70, 229, 0.18), 0 0 0 1px rgba(226, 232, 240, 0.8);
  background: #ffffff;
  position: relative;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.hero-image-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 24px 54px -10px rgba(79, 70, 229, 0.25), 0 0 0 1px rgba(99, 102, 241, 0.35);
}

.hero-image {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.hero-guarantees {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  max-width: 900px;
  margin: 0 auto;
}

.guarantee-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  color: var(--text-body);
  font-weight: 500;
}

.guarantee-item svg {
  color: var(--accent-cyan);
}

/* 2. 核心优势卡片网格 (浅色高质感白卡) */
.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: 36px 28px;
  transition: all var(--transition-normal);
  position: relative;
  box-shadow: var(--shadow-card);
}

.feature-card:hover {
  border-color: #cbd5e1;
  transform: translateY(-6px);
  box-shadow: var(--shadow-card-hover);
}

.feature-icon-wrapper {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  background: #eef2ff;
  border: 1px solid #e0e7ff;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  margin-bottom: 22px;
}

.feature-card:nth-child(2) .feature-icon-wrapper {
  background: #f0f9ff;
  border-color: #e0f2fe;
  color: var(--accent-cyan);
}

.feature-card:nth-child(3) .feature-icon-wrapper {
  background: #faf5ff;
  border-color: #f3e8ff;
  color: var(--accent-purple);
}

.feature-card:nth-child(4) .feature-icon-wrapper {
  background: #ecfdf5;
  border-color: #d1fae5;
  color: var(--accent-green);
}

.feature-card:nth-child(5) .feature-icon-wrapper {
  background: #fffbeb;
  border-color: #fef3c7;
  color: var(--accent-amber);
}

.feature-card:nth-child(6) .feature-icon-wrapper {
  background: #fdf2f8;
  border-color: #fce7f3;
  color: #db2777;
}

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

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

/* 3. 流媒体与 AI 支持专区 */
.media-ai-section {
  background: #ffffff;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.support-showcase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.support-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.support-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent-cyan));
}

.support-card.ai-card::before {
  background: linear-gradient(90deg, var(--accent-purple), var(--accent-cyan));
}

.support-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 18px;
}

.support-header h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
}

.support-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 24px;
}

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

.service-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-body);
  transition: all var(--transition-fast);
}

.service-badge:hover {
  background: #eef2ff;
  border-color: #c7d2fe;
  color: var(--primary);
  transform: translateY(-2px);
}

.service-badge .status-icon {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-green);
}

/* 4. 套餐价格对比表 */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-card);
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: #cbd5e1;
  box-shadow: var(--shadow-card-hover);
}

.pricing-card.featured {
  background: linear-gradient(180deg, #fbfaff 0%, #ffffff 100%);
  border: 2px solid var(--primary);
  box-shadow: 0 16px 36px -8px rgba(79, 70, 229, 0.16);
  transform: scale(1.03);
}

.pricing-card.featured:hover {
  transform: scale(1.04) translateY(-4px);
}

.ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #f59e0b 0%, #ec4899 100%);
  color: #ffffff;
  padding: 5px 18px;
  border-radius: var(--radius-full);
  font-size: 0.825rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  box-shadow: 0 4px 14px rgba(236, 72, 153, 0.38);
  z-index: 10;
  pointer-events: none;
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-main);
}

.plan-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  min-height: 42px;
}

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

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

.price-amount {
  font-size: 3.2rem;
  font-weight: 800;
  letter-spacing: -1px;
  color: var(--text-main);
  line-height: 1;
}

.price-cycle {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-left: 4px;
}

.plan-features {
  margin-bottom: 32px;
  flex-grow: 1;
}

.plan-features li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.95rem;
  color: var(--text-body);
  margin-bottom: 14px;
}

.plan-features li strong {
  color: var(--text-main);
}

.plan-features li svg {
  color: var(--accent-green);
  flex-shrink: 0;
  margin-top: 3px;
}

/* 5. 用户评价 (Testimonials) */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.review-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-stars {
  display: flex;
  gap: 4px;
  color: #f59e0b;
  margin-bottom: 16px;
  font-size: 1.1rem;
}

.review-content {
  font-size: 0.98rem;
  color: var(--text-body);
  line-height: 1.68;
  margin-bottom: 24px;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 14px;
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
}

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, #0284c7, #4f46e5);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
  font-size: 1.1rem;
}

.author-info h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
}

.author-info span {
  font-size: 0.825rem;
  color: var(--text-muted);
}

/* 6. 常见问题解答 (FAQ) */
.faq-wrap {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-fast);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.03);
}

.faq-item:hover {
  border-color: #cbd5e1;
}

.faq-item summary {
  padding: 22px 26px;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-main);
  user-select: none;
}

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

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

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

.faq-answer {
  padding: 0 26px 24px;
  font-size: 0.98rem;
  color: var(--text-body);
  line-height: 1.75;
}

/* 底部 CTA 引导区 (清爽渐变) */
.bottom-cta-banner {
  margin: 80px 0 30px;
  background: linear-gradient(135deg, #eef2ff 0%, #e0f2fe 100%);
  border: 1px solid #c7d2fe;
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 16px 32px -8px rgba(79, 70, 229, 0.12);
}

.bottom-cta-banner h2 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 16px;
  color: var(--text-main);
}

.bottom-cta-banner p {
  font-size: 1.08rem;
  color: var(--text-body);
  max-width: 600px;
  margin: 0 auto 32px;
}

/* 7. 页脚规范 (Footer) */
.footer {
  background: #ffffff;
  border-top: 1px solid var(--border-color);
  padding: 50px 0 40px;
  margin-top: 60px;
}

.footer-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 40px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.footer-nav a {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-body);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.footer-nav a:hover {
  color: var(--primary);
  background: #f1f5f9;
}

.footer-copyright {
  text-align: center;
  font-size: 0.875rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border-color);
  padding-top: 24px;
}

/* ==========================================================================
   二级独立展示页面专属样式 (关于我们、服务条款、隐私政策、网站地图)
   ========================================================================== */
.doc-page {
  padding: 50px 0 90px;
}

.doc-container {
  max-width: 880px;
  margin: 0 auto;
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 56px 48px;
  box-shadow: var(--shadow-card);
}

.doc-header {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 28px;
  margin-bottom: 36px;
}

.doc-header .doc-tag {
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 8px;
  display: block;
  letter-spacing: 0.5px;
}

.doc-header h1 {
  font-size: 2.3rem;
  font-weight: 800;
  margin-bottom: 10px;
  color: var(--text-main);
}

.doc-header .doc-date {
  color: var(--text-dim);
  font-size: 0.875rem;
}

.doc-content h2 {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 36px 0 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.doc-content h2::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 20px;
  background: var(--primary);
  border-radius: 2px;
}

.doc-content p {
  color: var(--text-body);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 18px;
}

.doc-content ul {
  margin-bottom: 24px;
  padding-left: 20px;
}

.doc-content ul li {
  list-style-type: disc;
  color: var(--text-body);
  margin-bottom: 10px;
  line-height: 1.7;
}

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

.alert-box {
  background: #eef2ff;
  border: 1px solid #c7d2fe;
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin: 24px 0;
  color: #3730a3;
  font-size: 0.95rem;
  line-height: 1.65;
}

.alert-box.danger {
  background: #fef2f2;
  border-color: #fecaca;
  color: #991b1b;
}

.alert-box.success {
  background: #ecfdf5;
  border-color: #a7f3d0;
  color: #065f46;
}

.sitemap-group {
  margin-bottom: 36px;
}

.sitemap-group h3 {
  font-size: 1.25rem;
  color: var(--text-main);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

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

.sitemap-links a {
  display: block;
  padding: 14px 18px;
  background: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-body);
  font-size: 0.95rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.sitemap-links a:hover {
  background: #eef2ff;
  border-color: #c7d2fe;
  color: var(--primary);
  transform: translateX(4px);
}

/* ==========================================================================
   移动端响应式适配规范 (@media)
   ========================================================================== */

/* 平板屏幕 (<= 992px) */
@media (max-width: 992px) {
  .features-grid,
  .pricing-grid,
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .pricing-card.featured {
    transform: none;
  }
  
  .pricing-card.featured:hover {
    transform: translateY(-4px);
  }

  .hero-title {
    font-size: 2.8rem;
  }
}

/* 手机屏幕 (<= 768px) - 完美单栏布局与手指触控尺寸优化 */
@media (max-width: 768px) {
  section {
    padding: 50px 0;
  }

  .navbar {
    padding: 12px 0;
  }

  .nav-links {
    display: none; /* 移动端精炼显示，避免遮挡 */
  }

  .hero-section {
    padding: 40px 0 35px;
  }

  .hero-title {
    font-size: 2.05rem;
    letter-spacing: -0.5px;
  }

  .hero-subtitle {
    font-size: 1.025rem;
    line-height: 1.6;
    margin-bottom: 28px;
  }

  .hero-cta {
    flex-direction: column;
    width: 100%;
    gap: 12px;
  }

  .hero-cta .btn {
    width: 100%;
    min-height: 50px;
    font-size: 1.05rem;
  }

  .hero-guarantees {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    padding: 20px 10px 0;
  }

  .features-grid,
  .support-showcase-grid,
  .pricing-grid,
  .reviews-grid,
  .sitemap-links {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .feature-card,
  .support-card,
  .pricing-card,
  .review-card {
    padding: 26px 20px;
  }

  .section-title {
    font-size: 1.85rem;
  }

  .section-desc {
    font-size: 0.98rem;
  }

  .footer-nav {
    flex-direction: column;
    gap: 14px;
    align-items: center;
  }

  .footer-nav a {
    width: 100%;
    text-align: center;
    padding: 12px;
    background: #f8fafc;
  }

  .doc-container {
    padding: 32px 20px;
  }

  .doc-header h1 {
    font-size: 1.8rem;
  }
}

/* 超小屏幕 (<= 480px) */
@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero-title {
    font-size: 1.8rem;
  }

  .price-amount {
    font-size: 2.6rem;
  }

  .bottom-cta-banner {
    padding: 36px 18px;
  }

  .bottom-cta-banner h2 {
    font-size: 1.65rem;
  }
}

/* ==========================================================================
   高科技网格卡片布局 (High-Tech Grid Cards Layout) & SEO 文章排版
   ========================================================================== */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 28px;
  margin: 36px 0;
}

.tech-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
  position: relative;
  box-shadow: var(--shadow-sm);
}

.tech-card:hover {
  transform: translateY(-6px);
  border-color: var(--primary);
  box-shadow: 0 14px 32px rgba(79, 70, 229, 0.12);
}

.tech-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}

.tech-card-badge {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--primary);
  background: rgba(79, 70, 229, 0.08);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(79, 70, 229, 0.2);
}

.tech-card-date {
  font-size: 0.8rem;
  color: var(--text-dim);
}

.tech-card-title {
  font-size: 1.22rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.45;
  margin-bottom: 12px;
  transition: color var(--transition-fast);
}

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

.tech-card-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 22px;
  flex-grow: 1;
}

.tech-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px dashed var(--border-color);
  padding-top: 16px;
}

.tech-card-link {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-fast);
}

.tech-card-link:hover {
  color: var(--primary-hover);
  transform: translateX(4px);
}

/* --- SEO 原创文章主体排版样式 --- */
.article-box {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 48px;
  max-width: 900px;
  margin: 0 auto 50px;
  box-shadow: 0 6px 28px rgba(15, 23, 42, 0.04);
}

.article-header-meta {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 24px;
  margin-bottom: 32px;
}

.article-main-title {
  font-size: 2.1rem;
  font-weight: 900;
  color: var(--text-main);
  line-height: 1.35;
  margin-bottom: 16px;
}

.article-sub-info {
  display: flex;
  gap: 20px;
  font-size: 0.88rem;
  color: var(--text-dim);
  flex-wrap: wrap;
}

.article-content h2 {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-main);
  margin: 36px 0 16px;
  border-left: 4px solid var(--primary);
  padding-left: 12px;
  line-height: 1.4;
}

.article-content h3 {
  font-size: 1.18rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 24px 0 12px;
}

.article-content p {
  color: var(--text-body);
  font-size: 1.02rem;
  line-height: 1.85;
  margin-bottom: 20px;
  text-align: justify;
}

.article-content ul, .article-content ol {
  margin-bottom: 24px;
  padding-left: 24px;
}

.article-content li {
  color: var(--text-body);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 10px;
}

.article-seo-box {
  background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
  border: 1px solid #cbd5e1;
  border-radius: var(--radius-md);
  padding: 24px;
  margin: 36px 0;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.02);
}

.article-seo-box h4 {
  font-size: 1.1rem;
  color: var(--accent-purple);
  margin-bottom: 12px;
  font-weight: 800;
}

.article-seo-box p {
  margin-bottom: 10px;
  font-size: 0.96rem;
  color: var(--text-body);
}

.article-seo-box a {
  color: var(--primary);
  font-weight: 700;
  text-decoration: underline;
}

.article-seo-box a:hover {
  color: var(--primary-hover);
}

/* 返回推荐咨询专属按钮 (各文章仅建1个) */
.return-consult-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--primary) 0%, #4338ca 100%);
  color: #ffffff !important;
  font-weight: 700;
  padding: 13px 30px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 16px rgba(79, 70, 229, 0.35);
  transition: all var(--transition-normal);
  margin-top: 36px;
  text-decoration: none;
}

.return-consult-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(79, 70, 229, 0.5);
  color: #ffffff !important;
}

@media (max-width: 768px) {
  .tech-grid {
    grid-template-columns: 1fr;
  }
  .article-box {
    padding: 24px 18px;
  }
  .article-main-title {
    font-size: 1.65rem;
  }
}