:root {
  --navy: #1b3a5c;
  --navy-dark: #102a43;
  --orange: #ff6633;
  --orange-hover: #e85a2a;
  --paper: #f8fafc;
  --paper-warm: #fffaf5;
  --line: #cbd5e1;
  --text: #263746;
  --muted: #64748b;
  --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "Microsoft YaHei", Arial, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-main);
  line-height: 1.8;
  color: var(--text);
  background-color: #fff;
  background-image: linear-gradient(rgba(27,58,92,.035) 1px, transparent 1px), linear-gradient(90deg, rgba(27,58,92,.035) 1px, transparent 1px);
  background-size: 32px 32px;
}

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

/* 站点顶部导航 */
.site-header {
  background: #fff;
  border-bottom: 3px solid var(--navy);
  position: sticky;
  top: 0;
  z-index: 100;
}
.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
}
.logo { display: flex; align-items: center; text-decoration: none; }
.logo img { height: 64px; width: auto; object-fit: contain; }
.nav-links { display: flex; gap: 28px; align-items: center; }
.nav-links a { font-size: 17px; font-weight: 700; color: var(--navy); transition: color .2s; }
.nav-links a:hover, .nav-links a.active { color: var(--orange); }
.nav-mobile { display: none; }

/* 面包屑 */
.breadcrumbs {
  max-width: 1000px;
  margin: 0 auto;
  padding: 14px 20px;
  font-size: 14px;
  color: var(--muted);
}
.breadcrumbs a { color: var(--navy); }
.breadcrumbs a:hover { color: var(--orange); text-decoration: underline; }
.breadcrumbs .sep { margin: 0 8px; color: #94a3b8; }

/* 专栏列表页 Hero */
.hub-hero {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-dark) 100%);
  color: #fff;
  padding: 56px 20px 48px;
  text-align: center;
}
.hub-hero .eyebrow {
  color: #ffd0bf;
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.1em;
  margin-bottom: 12px;
  text-transform: uppercase;
}
.hub-hero h1 {
  font-size: clamp(28px, 4.5vw, 44px);
  font-weight: 900;
  margin-bottom: 14px;
  line-height: 1.25;
}
.hub-hero p {
  font-size: clamp(15px, 2vw, 18px);
  color: #e2e8f0;
  max-width: 760px;
  margin: 0 auto;
}

/* 专栏文章卡片流 */
.articles-wrap {
  max-width: 1000px;
  margin: 40px auto 60px;
  padding: 0 20px;
}
.articles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
.article-card {
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: 4px 4px 0 var(--navy);
  padding: 28px;
  transition: transform .2s ease, box-shadow .2s ease;
  display: flex;
  flex-direction: column;
}
.article-card:hover {
  transform: translateY(-3px);
  box-shadow: 6px 6px 0 var(--navy);
}
.article-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13.5px;
  color: var(--muted);
  margin-bottom: 12px;
}
.tag-badge {
  background: #eef4fa;
  color: var(--navy);
  font-weight: 700;
  font-size: 12.5px;
  padding: 3px 10px;
  border-radius: 2px;
  border: 1px solid rgba(27,58,92,0.15);
}
.article-card h2 {
  font-size: clamp(20px, 2.5vw, 24px);
  color: var(--navy);
  margin-bottom: 12px;
  line-height: 1.35;
}
.article-card p {
  color: #475569;
  font-size: 15.5px;
  line-height: 1.7;
  margin-bottom: 18px;
  flex: 1;
}
.read-more {
  color: var(--orange);
  font-weight: 700;
  font-size: 15px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.read-more:hover {
  text-decoration: underline;
}

/* 文章详情页主体 */
.article-detail-container {
  max-width: 900px;
  margin: 24px auto 60px;
  padding: 0 20px;
}
.article-header {
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: 4px 4px 0 var(--navy);
  padding: 36px 32px 28px;
  margin-bottom: 28px;
}
.article-header .tag-badge {
  margin-bottom: 14px;
  display: inline-block;
}
.article-header h1 {
  font-size: clamp(24px, 3.8vw, 36px);
  color: var(--navy);
  font-weight: 900;
  line-height: 1.3;
  margin-bottom: 16px;
}
.article-meta-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  font-size: 14px;
  color: var(--muted);
  border-top: 1px solid #f1f5f9;
  padding-top: 16px;
}

/* 文章正文 */
.article-body {
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: 4px 4px 0 var(--navy);
  padding: 36px 32px;
  font-size: 16.5px;
  line-height: 1.85;
}
.article-summary {
  background: var(--paper-warm);
  border: 1px solid rgba(255,102,51,0.25);
  border-left: 5px solid var(--orange);
  padding: 20px 24px;
  margin-bottom: 32px;
  font-size: 16px;
  color: #334155;
}
.article-summary strong {
  color: var(--navy);
  display: block;
  margin-bottom: 6px;
  font-size: 17px;
}
.article-body h2 {
  font-size: 22px;
  color: var(--navy);
  margin: 36px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid #e2e8f0;
  font-weight: 800;
}
.article-body h3 {
  font-size: 18px;
  color: var(--navy);
  margin: 24px 0 12px;
  font-weight: 700;
}
.article-body p {
  margin-bottom: 18px;
  color: #334155;
}
.article-body ul, .article-body ol {
  margin: 0 0 20px 24px;
  color: #334155;
}
.article-body li {
  margin-bottom: 8px;
}
.article-body strong {
  color: #0f172a;
}
.article-body blockquote {
  background: var(--paper);
  border-left: 4px solid var(--navy);
  padding: 16px 20px;
  margin: 20px 0;
  color: #475569;
  font-style: normal;
}

/* 核心要点卡片 */
.takeaway-box {
  background: #f0f7ff;
  border: 1px solid #bae0ff;
  border-radius: 4px;
  padding: 24px;
  margin: 32px 0;
}
.takeaway-box h3 {
  color: var(--navy);
  font-size: 18px;
  margin-top: 0;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.takeaway-box ol {
  margin-bottom: 0;
  padding-left: 20px;
}
.takeaway-box li {
  margin-bottom: 8px;
  color: #1e293b;
  font-weight: 500;
}

/* 适用人群卡片 */
.audience-box {
  background: #f8fafc;
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 24px;
  margin: 28px 0;
}
.audience-box h3 {
  color: var(--navy);
  font-size: 17px;
  margin-top: 0;
  margin-bottom: 10px;
}

/* 站内关联与内链卡片 */
.related-links-box {
  background: var(--paper);
  border: 1px dashed var(--line);
  padding: 20px 24px;
  margin-top: 36px;
  border-radius: 4px;
}
.related-links-box strong {
  color: var(--navy);
  display: block;
  margin-bottom: 10px;
}
.related-links-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.related-links-list li a {
  color: var(--navy);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.related-links-list li a:hover {
  color: var(--orange);
}

/* 底部文章翻页 */
.article-pagination {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 28px;
}
.article-pagination a {
  background: #fff;
  border: 1px solid var(--line);
  padding: 16px 20px;
  box-shadow: 2px 2px 0 var(--navy);
  flex: 1;
  transition: all .2s;
}
.article-pagination a:hover {
  box-shadow: 4px 4px 0 var(--navy);
  color: var(--orange);
}
.pagination-label {
  font-size: 12.5px;
  color: var(--muted);
  display: block;
  margin-bottom: 4px;
}
.pagination-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.4;
}

/* CTA 试翻区 */
.article-cta {
  background: var(--navy);
  color: #fff;
  padding: 48px 24px;
  text-align: center;
  margin-top: 36px;
  border: 1px solid var(--line);
  box-shadow: 4px 4px 0 var(--navy-dark);
}
.article-cta h2 {
  color: #fff;
  font-size: clamp(22px, 3vw, 28px);
  margin-bottom: 10px;
}
.article-cta p {
  color: #e2e8f0;
  font-size: 15.5px;
  max-width: 640px;
  margin: 0 auto 20px;
}
.btn-cta {
  display: inline-block;
  background: var(--orange);
  color: #fff;
  font-weight: 700;
  font-size: 16px;
  padding: 12px 32px;
  border-radius: 0;
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
  transition: background .2s;
  cursor: pointer;
  border: none;
}
.btn-cta:hover {
  background: var(--orange-hover);
}

/* 页脚 */
.site-footer {
  background-color: var(--navy-dark);
  color: rgba(255,255,255,0.75);
  padding: 32px 20px;
  text-align: center;
  font-size: 14px;
  margin-top: 60px;
}
.site-footer a {
  color: rgba(255,255,255,0.85);
  text-decoration: none;
}
.site-footer a:hover {
  color: #fff;
  text-decoration: underline;
}
.site-footer .footer-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 18px;
  margin-bottom: 14px;
  font-weight: 500;
}

/* 微信弹窗浮层 */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: 999;
  justify-content: center;
  align-items: center;
  padding: 20px;
}
.modal-overlay.active {
  display: flex;
}
.modal-content {
  background: #fff;
  padding: 28px;
  max-width: 380px;
  width: 100%;
  text-align: center;
  position: relative;
  box-shadow: 0 10px 25px rgba(0,0,0,0.3);
}
.modal-close {
  position: absolute;
  top: 10px;
  right: 14px;
  font-size: 24px;
  color: #64748b;
  cursor: pointer;
  background: none;
  border: none;
}
.modal-qr {
  width: 200px;
  height: 200px;
  margin: 14px auto;
  display: block;
}

/* 响应式适配 */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-mobile {
    display: flex;
    gap: 16px;
    padding: 10px 20px;
    background: #f8fafc;
    border-bottom: 1px solid var(--line);
    justify-content: center;
    font-size: 14.5px;
    font-weight: 700;
  }
  .nav-mobile a { color: var(--navy); }
  .nav-mobile a.active { color: var(--orange); }
  .article-header, .article-body { padding: 24px 18px; }
  .article-pagination { flex-direction: column; }
}