/* ===================================================================
   榴莲云 (Durian Cloud) 官方样式库 - 纯原生极简高能 CSS (浅色清爽版)
   极致轻量 · 零外部依赖 · 秒开级加载 · 响应式适配 · 浅色优雅
   =================================================================== */

:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #fdfefe;
  --bg-glass: rgba(255, 255, 255, 0.92);
  --border-color: #e2e8f0;
  --border-highlight: rgba(217, 119, 6, 0.45);

  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;

  --accent-gold: #d97706;
  --accent-gold-hover: #b45309;
  --accent-gold-glow: rgba(217, 119, 6, 0.15);
  --accent-cyan: #0284c7;
  --accent-green: #16a34a;
  --accent-blue: #2563eb;

  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.06);
  --shadow-glow: 0 0 28px rgba(217, 119, 6, 0.14);

  --container-width: 1200px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-stack);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(245, 158, 11, 0.07), transparent 70%),
    radial-gradient(ellipse 60% 40% at 90% 50%, rgba(2, 132, 199, 0.04), transparent 60%);
  background-attachment: fixed;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.2s ease;
}

ul, ol {
  list-style: none;
}

img, svg {
  vertical-align: middle;
}

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

.section {
  padding: 80px 0;
  position: relative;
}

.section-alt {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 50px auto;
}

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  color: var(--accent-gold);
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.25);
  padding: 6px 18px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
}

.section-title {
  font-size: 2.3rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text-primary);
  margin-bottom: 16px;
  line-height: 1.3;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* 导航栏 */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.03);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-primary);
}

.logo-badge {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #fff;
  padding: 4px 9px;
  border-radius: 8px;
  font-size: 1.1rem;
  line-height: 1;
  box-shadow: 0 2px 8px rgba(217, 119, 6, 0.3);
}

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

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
}

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

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

.nav-link.nav-highlight::after {
  content: "热门";
  display: inline-block;
  font-size: 0.65rem;
  background: linear-gradient(135deg, #ef4444, #f59e0b);
  color: #fff;
  padding: 1px 6px;
  border-radius: 4px;
  margin-left: 5px;
  vertical-align: top;
  font-weight: 700;
  line-height: 1.2;
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all 0.25s ease;
  white-space: nowrap;
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #ffffff;
  box-shadow: 0 4px 16px rgba(217, 119, 6, 0.28);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #fbbf24, #d97706);
  box-shadow: 0 6px 20px rgba(217, 119, 6, 0.38);
  transform: translateY(-2px);
}

.btn-secondary {
  background: #ffffff;
  color: var(--text-primary);
  border: 1px solid #cbd5e1;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
}

.btn-secondary:hover {
  background: #f8fafc;
  border-color: #94a3b8;
  color: var(--accent-gold);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 15px 36px;
  font-size: 1.1rem;
}

.btn-block {
  width: 100%;
}

/* 主视觉区 (Hero Section) */
.hero {
  padding: 85px 0 65px 0;
  text-align: center;
  position: relative;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.28);
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  color: var(--accent-gold);
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-title {
  font-size: 3.3rem;
  font-weight: 900;
  letter-spacing: -1px;
  line-height: 1.2;
  margin-bottom: 24px;
  color: var(--text-primary);
}

.hero-title-highlight {
  background: linear-gradient(135deg, #d97706 10%, #f59e0b 50%, #0284c7 95%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 820px;
  margin: 0 auto 36px auto;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-bottom: 48px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 960px;
  margin: 0 auto;
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

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

.stat-num {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--accent-gold);
  display: block;
}

.stat-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* 核心优势网格 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--accent-gold), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-highlight);
  box-shadow: var(--shadow-md);
  background: var(--bg-card-hover);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon-box {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  background: rgba(245, 158, 11, 0.1);
  color: var(--accent-gold);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 20px;
}

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

.feature-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* 生态赋能卡片 */
.support-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
}

.support-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.03);
}

.support-badge {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
}

.badge-ai {
  background: rgba(2, 132, 199, 0.08);
  color: var(--accent-cyan);
  border: 1px solid rgba(2, 132, 199, 0.25);
}

.badge-stream {
  background: rgba(245, 158, 11, 0.08);
  color: var(--accent-gold);
  border: 1px solid rgba(245, 158, 11, 0.25);
}

.support-title {
  font-size: 1.45rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text-primary);
}

.support-desc {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}

.pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tech-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #f8fafc;
  border: 1px solid var(--border-color);
  padding: 8px 16px;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  color: var(--text-primary);
  font-weight: 500;
}

.tech-pill span {
  color: var(--accent-green);
  font-weight: bold;
}

/* 价格套餐对比表 */
.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 0.3s ease;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
}

.pricing-card.popular {
  border: 2px solid var(--accent-gold);
  background: linear-gradient(180deg, #fffbeb 0%, #ffffff 100%);
  box-shadow: 0 12px 32px rgba(217, 119, 6, 0.12);
  transform: scale(1.03);
  z-index: 2;
}

.popular-tag {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 1px;
  padding: 4px 18px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 12px rgba(217, 119, 6, 0.3);
}

.plan-name {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.plan-target {
  font-size: 0.9rem;
  color: var(--text-muted);
  min-height: 42px;
  margin-bottom: 16px;
}

.plan-badges {
  display: flex;
  gap: 8px;
  margin: 8px 0 16px 0;
  flex-wrap: wrap;
}

.plan-badge {
  font-size: 0.78rem;
  padding: 3px 10px;
  border-radius: 6px;
  background: #f1f5f9;
  color: var(--text-secondary);
  border: 1px solid #e2e8f0;
}

.plan-badge.gold {
  background: #fef3c7;
  color: #b45309;
  border-color: #fde68a;
  font-weight: 600;
}

.plan-badge.cyan {
  background: #e0f2fe;
  color: #0369a1;
  border-color: #bae6fd;
  font-weight: 600;
}

.plan-price-wrap {
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

.plan-price-starting {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.plan-price {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.1;
  margin: 6px 0;
}

.plan-price .currency {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--accent-gold);
}

.plan-price .unit {
  font-size: 0.95rem;
  font-weight: 400;
  color: var(--text-secondary);
}

.billing-cycle-info {
  margin-top: 10px;
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
  background: #f8fafc;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.billing-cycle-info .save {
  color: var(--accent-green);
  font-weight: 600;
}

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

.plan-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.plan-feature-item.highlight {
  color: var(--text-primary);
  font-weight: 600;
}

.check-icon {
  color: var(--accent-green);
  font-weight: bold;
}

/* 用户评价 */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.2s ease;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
}

.review-card:hover {
  transform: translateY(-4px);
  border-color: #cbd5e1;
  box-shadow: var(--shadow-md);
}

.review-stars {
  color: #f59e0b;
  margin-bottom: 14px;
  font-size: 1rem;
  letter-spacing: 2px;
}

.review-text {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.review-user {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border-color);
  padding-top: 14px;
}

.review-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, #3b82f6, #06b6d4);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
  font-size: 0.9rem;
}

.review-avatar.alt-1 { background: linear-gradient(135deg, #f59e0b, #ef4444); }
.review-avatar.alt-2 { background: linear-gradient(135deg, #10b981, #06b6d4); }
.review-avatar.alt-3 { background: linear-gradient(135deg, #8b5cf6, #ec4899); }

.review-name {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}

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

/* 常见问题 (纯 CSS 原生折叠) */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.2s ease;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.02);
}

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

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

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

.faq-question::after {
  content: "+";
  font-size: 1.4rem;
  color: var(--accent-gold);
  font-weight: 400;
  transition: transform 0.2s ease;
}

.faq-item[open] .faq-question::after {
  content: "−";
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 24px 22px 24px;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* 底部行动召唤 (Bottom CTA) */
.bottom-cta {
  background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
  text-align: center;
  padding: 80px 0;
  border-top: 1px solid var(--border-color);
}

.bottom-cta-box {
  max-width: 780px;
  margin: 0 auto;
  padding: 48px 32px;
  background: linear-gradient(135deg, #fffbeb 0%, #ffffff 100%);
  border: 1px solid rgba(245, 158, 11, 0.3);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

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

.bottom-cta-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

/* 页脚 (严格四个标题) */
.footer {
  background-color: #f8fafc;
  border-top: 1px solid var(--border-color);
  padding: 40px 0 32px 0;
  text-align: center;
}

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

.footer-link {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.footer-link:hover {
  color: var(--accent-gold);
  background: rgba(245, 158, 11, 0.08);
}

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

/* 独立子页面样式 */
.doc-page {
  padding: 60px 0 80px 0;
  background-color: #f8fafc;
}

.doc-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 48px;
  max-width: 900px;
  margin: 0 auto;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
}

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

.doc-title {
  font-size: 2.1rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.35;
}

.doc-date {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.doc-content h2 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent-gold);
  margin: 32px 0 14px 0;
}

.doc-content h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 20px 0 10px 0;
}

.doc-content p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 16px;
}

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

.doc-content li {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 8px;
  list-style-type: disc;
}

.doc-content code {
  background: #f1f5f9;
  color: #0f172a;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9rem;
  border: 1px solid #e2e8f0;
}

.doc-alert {
  background: #fffbeb;
  border-left: 4px solid var(--accent-gold);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
  color: var(--text-primary);
  border: 1px solid #fef3c7;
  border-left-width: 4px;
}

.doc-back-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent-gold);
  font-weight: 600;
  margin-bottom: 24px;
  font-size: 0.95rem;
}

.doc-back-btn:hover {
  text-decoration: underline;
}

/* 网站地图列表卡片 */
.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 24px;
}

.sitemap-group {
  background: #f8fafc;
  padding: 24px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.sitemap-group-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--accent-gold);
  margin-bottom: 16px;
}

.sitemap-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sitemap-links a {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.sitemap-links a:hover {
  color: var(--accent-gold);
  transform: translateX(4px);
}

.sitemap-article-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.sitemap-article-links a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

.sitemap-article-links a:hover {
  color: var(--accent-gold);
  transform: translateX(4px);
}

/* 高科技网格卡片 (浅色优雅微光版) */
.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin: 32px 0 10px 0;
}

.article-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
}

.article-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, #f59e0b, #0284c7);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.article-card:hover {
  transform: translateY(-5px);
  border-color: rgba(217, 119, 6, 0.45);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.08);
}

.article-card:hover::before {
  opacity: 1;
}

.article-badge {
  display: inline-block;
  align-self: flex-start;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-gold);
  background: #fef3c7;
  border: 1px solid #fde68a;
  padding: 3px 10px;
  border-radius: 4px;
  margin-bottom: 14px;
  letter-spacing: 0.5px;
}

.article-badge.brand {
  color: #0369a1;
  background: #e0f2fe;
  border-color: #bae6fd;
}

.article-title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.48;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.article-title a {
  color: inherit;
}

.article-title a:hover {
  color: var(--accent-gold);
}

.article-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

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

.article-link-btn {
  color: var(--accent-gold);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.85rem;
}

.article-link-btn:hover {
  color: var(--accent-gold-hover);
  transform: translateX(2px);
}

/* ===================================================================
   响应式适配 (@media 媒体查询)
   =================================================================== */

@media (max-width: 1024px) {
  .hero-title {
    font-size: 2.8rem;
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 540px;
    margin: 0 auto;
  }
  .pricing-card.popular {
    transform: none;
  }
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .article-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .section {
    padding: 56px 0;
  }

  .nav-container {
    height: auto;
    padding: 12px 20px;
    flex-wrap: wrap;
    gap: 8px;
  }

  .nav-menu {
    display: flex;
    width: 100%;
    overflow-x: auto;
    white-space: nowrap;
    padding: 8px 0 2px 0;
    gap: 18px;
    border-top: 1px solid var(--border-color);
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .nav-menu::-webkit-scrollbar {
    display: none;
  }

  .nav-link {
    font-size: 0.88rem;
  }

  .hero {
    padding: 50px 0 40px 0;
  }

  .hero-title {
    font-size: 2.2rem;
    letter-spacing: -0.5px;
  }

  .hero-subtitle {
    font-size: 1.05rem;
    line-height: 1.7;
    margin-bottom: 28px;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
    gap: 14px;
  }

  .hero-actions .btn {
    width: 100%;
    padding: 16px 20px;
    font-size: 1.05rem;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    padding: 18px 12px;
  }

  .stat-num {
    font-size: 1.5rem;
  }

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

  .features-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .feature-card {
    padding: 24px 20px;
  }

  .support-wrapper {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .reviews-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .bottom-cta-box {
    padding: 36px 20px;
  }

  .bottom-cta-title {
    font-size: 1.75rem;
  }

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

  .footer-link {
    display: block;
    width: 100%;
    padding: 10px;
    font-size: 1.05rem;
  }

  .doc-card {
    padding: 28px 20px;
  }

  .doc-title {
    font-size: 1.75rem;
  }

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

  .sitemap-article-links {
    grid-template-columns: 1fr;
  }

  .article-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }
}