/* ==========================================================================
   可乐云 (Kele Cloud) - 浅色极速响应式样式表
   Pure Vanilla CSS - Zero external dependencies
   ========================================================================== */

/* 1. 全局变量与 Reset */
:root {
  --primary-color: #e63946;
  --primary-hover: #d62828;
  --primary-light: #fff1f2;
  --secondary-color: #2563eb;
  --secondary-light: #eff6ff;
  
  --bg-body: #f8fafc;
  --bg-card: #ffffff;
  --bg-alt: #f1f5f9;
  
  --text-title: #0f172a;
  --text-body: #334155;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 10px 30px rgba(15, 23, 42, 0.12);
  --shadow-primary: 0 8px 25px rgba(230, 57, 70, 0.25);
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --max-width: 1200px;
  --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  background-color: var(--bg-body);
  color: var(--text-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

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

/* 2. 通用容器与布局 */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 5rem 0;
}

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

.section-header {
  text-align: center;
  max-width: 750px;
  margin: 0 auto 3.5rem auto;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 1rem;
  background-color: var(--primary-light);
  color: var(--primary-color);
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--text-title);
  line-height: 1.25;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.section-desc {
  font-size: 1.125rem;
  color: var(--text-muted);
}

/* 3. 按钮规范与 CTA */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.85rem 1.75rem;
  font-size: 1rem;
  font-weight: 700;
  border-radius: var(--radius-md);
  transition: var(--transition-fast);
  cursor: pointer;
  border: 2px solid transparent;
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--primary-color);
  color: #ffffff;
  box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(230, 57, 70, 0.35);
}

.btn-secondary {
  background-color: var(--bg-card);
  color: var(--text-title);
  border-color: var(--border-color);
  box-shadow: var(--shadow-sm);
}

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

.btn-lg {
  padding: 1.1rem 2.25rem;
  font-size: 1.125rem;
  border-radius: var(--radius-lg);
}

.btn-block {
  width: 100%;
}

/* 4. 导航栏 Header */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition-fast);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--text-title);
  letter-spacing: -0.03em;
}

.logo-icon {
  width: 2.5rem;
  height: 2.5rem;
  background: linear-gradient(135deg, #e63946 0%, #d62828 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 900;
  font-size: 1.35rem;
  line-height: 1;
  box-shadow: 0 4px 12px rgba(230, 57, 70, 0.3);
  user-select: none;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-body);
  transition: var(--transition-fast);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* 5. Hero 主视觉区 */
.hero {
  padding: 5rem 0 6rem 0;
  background: radial-gradient(circle at 50% 0%, #fff1f2 0%, var(--bg-body) 70%);
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  background-color: #ffffff;
  border: 1px solid #fecdd3;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--primary-color);
  box-shadow: var(--shadow-sm);
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: 3.25rem;
  font-weight: 900;
  color: var(--text-title);
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
}

.hero-title span {
  background: linear-gradient(135deg, #e63946 0%, #2563eb 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-muted);
  margin-bottom: 2.25rem;
  line-height: 1.6;
}

.hero-ctas {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: 2.75rem;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
}

.hero-media {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  transition: var(--transition-fast);
  background: var(--bg-card);
}

.hero-media:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 40px rgba(15, 23, 42, 0.16);
}

.hero-img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

.stat-item h4 {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-title);
  line-height: 1.1;
}

.stat-item p {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.hero-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  position: relative;
}

.hero-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1.25rem;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-color);
}

.ping-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: #10b981;
  font-weight: 700;
  font-size: 0.875rem;
  background-color: #ecfdf5;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
}

.ping-dot {
  width: 8px;
  height: 8px;
  background-color: #10b981;
  border-radius: 50%;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
}

.node-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.node-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1rem;
  background-color: var(--bg-body);
  border-radius: var(--radius-md);
  font-size: 0.925rem;
  font-weight: 600;
}

.node-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.node-flag {
  font-size: 1.25rem;
}

.node-speed {
  color: #10b981;
  font-weight: 700;
}

/* 6. 产品核心优势 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.feature-card {
  background: var(--bg-card);
  padding: 2.25rem 1.75rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-fast);
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: #cbd5e1;
}

.feature-icon {
  width: 3.5rem;
  height: 3.5rem;
  border-radius: var(--radius-md);
  background-color: var(--primary-light);
  color: var(--primary-color);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.feature-icon svg {
  width: 1.85rem;
  height: 1.85rem;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-title);
  margin-bottom: 0.75rem;
}

.feature-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 7. 流媒体与 AI 支持专区 */
.services-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
}

.service-block {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.service-block-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.75rem;
}

.service-block-icon {
  width: 3rem;
  height: 3rem;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
}

.icon-media {
  background: linear-gradient(135deg, #e50914 0%, #ff4757 100%);
}

.icon-ai {
  background: linear-gradient(135deg, #10a37f 0%, #00b4d8 100%);
}

.service-block-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-title);
}

.service-tags-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.service-item-card {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 1rem;
  background-color: var(--bg-body);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  transition: var(--transition-fast);
}

.service-item-card:hover {
  background-color: #ffffff;
  border-color: var(--primary-color);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.service-logo {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.85rem;
  color: #ffffff;
  flex-shrink: 0;
}

.logo-netflix { background: #e50914; }
.logo-disney { background: #113ccf; }
.logo-youtube { background: #ff0000; }
.logo-hbo { background: #5822b4; }

.logo-chatgpt { background: #10a37f; }
.logo-claude { background: #d97706; }
.logo-midjourney { background: #2563eb; }
.logo-copilot { background: #000000; }

.service-item-name {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-title);
}

.service-item-sub {
  font-size: 0.775rem;
  color: var(--text-muted);
}

/* 8. 套餐价格对比表 */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  padding: 2.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.pricing-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}

.pricing-card.featured {
  border: 2px solid var(--primary-color);
  box-shadow: var(--shadow-lg);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--primary-color);
  color: #ffffff;
  font-size: 0.775rem;
  font-weight: 800;
  padding: 0.35rem 1rem;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  box-shadow: 0 4px 10px rgba(230, 57, 70, 0.3);
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-title);
  margin-bottom: 0.5rem;
}

.plan-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  min-height: 2.5rem;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
  margin-bottom: 1.75rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.currency {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--primary-color);
}

.price-amount {
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--text-title);
  line-height: 1;
}

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

.plan-features {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-bottom: 2rem;
  flex-grow: 1;
}

.plan-feature-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.9rem;
  color: var(--text-body);
}

.plan-feature-item.disabled {
  color: #94a3b8;
  text-decoration: line-through;
}

.check-icon {
  width: 1.15rem;
  height: 1.15rem;
  color: #10b981;
  flex-shrink: 0;
}

/* 9. 用户评价 Section */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.review-card {
  background: var(--bg-card);
  padding: 2rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-stars {
  display: flex;
  gap: 0.25rem;
  color: #f59e0b;
  margin-bottom: 1rem;
}

.review-text {
  font-size: 0.975rem;
  color: var(--text-body);
  line-height: 1.6;
  margin-bottom: 1.5rem;
  font-style: italic;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

.avatar {
  width: 2.75rem;
  height: 2.75rem;
  border-radius: var(--radius-full);
  background-color: var(--secondary-light);
  color: var(--secondary-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1rem;
}

.author-name {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-title);
}

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

/* 10. FAQ Section */
.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.faq-card {
  background: var(--bg-card);
  padding: 2rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.faq-question {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-title);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
}

.faq-q-badge {
  color: var(--primary-color);
  font-weight: 900;
}

.faq-answer {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
  padding-left: 1.5rem;
}

/* 11. 页脚 Footer（严格仅保留4个标题链接） */
.site-footer {
  background-color: #ffffff;
  border-top: 1px solid var(--border-color);
  padding: 3.5rem 0 2.5rem 0;
  margin-top: auto;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-title);
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2.5rem;
  flex-wrap: wrap;
}

.footer-nav-link {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-title);
  transition: var(--transition-fast);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
}

.footer-nav-link:hover {
  color: var(--primary-color);
  background-color: var(--primary-light);
}

.footer-copyright {
  font-size: 0.875rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
  width: 100%;
  padding-top: 1.75rem;
  margin-top: 1rem;
}

/* 12. 独立子页面通用样式（About, Terms, Privacy, Sitemap） */
.page-header {
  background: radial-gradient(circle at 50% 0%, #fff1f2 0%, var(--bg-body) 100%);
  padding: 4rem 0 3rem 0;
  border-bottom: 1px solid var(--border-color);
  text-align: center;
}

.page-title {
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--text-title);
  margin-bottom: 0.75rem;
}

.page-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
}

.content-box {
  background: #ffffff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  padding: 3rem;
  box-shadow: var(--shadow-sm);
  margin: 3rem 0;
}

.content-box h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-title);
  margin: 2rem 0 1rem 0;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--primary-light);
}

.content-box h2:first-child {
  margin-top: 0;
}

.content-box p {
  font-size: 1rem;
  color: var(--text-body);
  line-height: 1.8;
  margin-bottom: 1.25rem;
}

.content-box ul {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.content-box li {
  list-style-type: disc;
  font-size: 0.975rem;
  color: var(--text-body);
  margin-bottom: 0.5rem;
  line-height: 1.6;
}

/* 13. 移动端响应式适配 Media Queries */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }
  
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .services-container {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .navbar-inner {
    height: 4rem;
  }
  
  .nav-menu {
    display: none; /* 在移动端优先保留最核心的注册购买行动 */
  }
  
  .hero {
    padding: 3rem 0 4rem 0;
  }
  
  .hero-title {
    font-size: 2.25rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  .hero-ctas {
    flex-direction: column;
    width: 100%;
  }
  
  .hero-ctas .btn {
    width: 100%;
  }
  
  .hero-stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
    text-align: center;
  }

  .stat-item h4 {
    font-size: 1.35rem;
  }
  
  .features-grid,
  .pricing-grid,
  .reviews-grid,
  .faq-grid,
  .service-tags-grid {
    grid-template-columns: 1fr;
  }
  
  .pricing-card.featured {
    transform: none;
  }
  
  .section {
    padding: 3.5rem 0;
  }
  
  .section-title {
    font-size: 1.75rem;
  }
  
  .footer-nav {
    flex-direction: column;
    gap: 1rem;
  }
  
  .content-box {
    padding: 1.75rem;
    margin: 1.75rem 0;
  }
}

/* 14. 推荐资讯与文章列表 Grid Cards 布局 */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.article-card-tech {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.article-card-tech:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-color);
}

.article-card-tech::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
}

.article-card-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.75rem;
  background-color: var(--primary-light);
  color: var(--primary-color);
  font-size: 0.775rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  margin-bottom: 1rem;
  width: fit-content;
}

.article-card-title {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-title);
  line-height: 1.4;
  margin-bottom: 0.75rem;
  transition: var(--transition-fast);
}

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

.article-card-desc {
  font-size: 0.925rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.article-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.825rem;
  color: var(--text-muted);
}

.article-read-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--primary-color);
  font-weight: 700;
  font-size: 0.9rem;
}

/* 文章详情页优化 */
.article-detail-box {
  background: #ffffff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  padding: 3.5rem;
  box-shadow: var(--shadow-sm);
  margin: 2.5rem 0;
}

.article-detail-box h1 {
  font-size: 2.25rem;
  font-weight: 900;
  color: var(--text-title);
  line-height: 1.3;
  margin-bottom: 1.5rem;
}

.article-detail-meta {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding-bottom: 1.75rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.9rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.article-content {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text-body);
}

.article-content h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-title);
  margin: 2.25rem 0 1rem 0;
  padding-left: 0.85rem;
  border-left: 4px solid var(--primary-color);
}

.article-content p {
  margin-bottom: 1.35rem;
}

.article-content ul, .article-content ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.article-content li {
  margin-bottom: 0.6rem;
  line-height: 1.7;
}

.article-content a {
  color: var(--secondary-color);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

@media (max-width: 1024px) {
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .article-detail-box {
    padding: 1.75rem;
  }
  .article-detail-box h1 {
    font-size: 1.65rem;
  }
}