:root{
  --navy:#0a2a44; /* 海军蓝 */
  --fog:#f3f6f7;  /* 浅雾灰 */
  --text:#12202b;
  --muted:#55656f;
  --accent:#0b4a78;
  --max-width:1280px; /* 在1120-1440之间取中间值 */
  --gap:20px;
  --line-height:1.6;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans CJK SC", "PingFang SC", "Hiragino Sans GB", "Microsoft Yahei", sans-serif;
}

/* Reset-ish */
*{box-sizing:border-box}
html,body{height:100%;margin:0;color:var(--text);background:linear-gradient(180deg,var(--fog) 0%, #ffffff 1%);} 
a{color:inherit;text-decoration:none}

.site-header{background:var(--navy);color:#fff;border-bottom:4px solid rgba(0,0,0,0.06);}
.header-inner{max-width:var(--max-width);margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:18px 24px}
.brand-link{font-weight:700;letter-spacing:0.4px;color:#fff}
.nav-index ul{display:flex;gap:18px;list-style:none;padding:0;margin:0}
.nav-index span{font-size:14px;color:rgba(255,255,255,0.9)}

.ad-block{max-width:var(--max-width);margin:18px auto;padding:12px 16px;background:#fff;border:1px dashed #e6eef2;color:var(--muted);font-size:13px}

.site-wrap{max-width:var(--max-width);margin:0 auto;padding:28px 18px 60px}
.dashboard-grid{display:grid;grid-template-columns:1fr;gap:var(--gap)}

/* Article */
.article .article-head{margin-bottom:18px}
.title-row{display:block;margin-bottom:12px}
.title-row h1{font-size:22px;margin:0;color:var(--text);line-height:1.12;font-weight:700}
.summary{margin-top:10px;color:var(--muted);font-size:15px}
.meta{display:flex;flex-wrap:wrap;gap:12px;color:var(--muted);font-size:13px;margin-bottom:18px}
.content{background:#fff;padding:20px;border:1px solid #eef3f5;color:var(--text);line-height:var(--line-height);}
.content :where(p,ul,ol){margin:0 0 12px 0}

.section-title{font-size:16px;margin:18px 0 10px 0;color:var(--accent);font-weight:600}

.faq-grid{display:block}
.related-grid{display:block}

/* Side info */
.side-info{display:block;margin-top:18px}
.info-block{background:white;border:1px solid #e6eef2;padding:14px;color:var(--muted);margin-bottom:var(--gap)}
.info-block h3{margin:0 0 8px 0;color:var(--navy);font-size:14px}
.info-block dl{margin:0;font-size:14px}
.info-block dt{font-weight:600;color:var(--text)}
.info-block dd{margin:4px 0 10px 0;color:var(--muted)}

.recommend-row{max-width:var(--max-width);margin:28px auto 0;padding:0 18px}
.recommend-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.rec{background:#fff;border:1px solid #eef3f5;padding:14px;text-align:center;color:var(--muted)}

.site-footer{border-top:1px solid #e6eef2;background:transparent;padding:20px 0;margin-top:30px}
.footer-inner{max-width:var(--max-width);margin:0 auto;color:var(--muted);padding:0 18px}

/* ---- Desktop (>=1024px) 特有布局：仪表板式双栏、标题通栏、正文8列，右栏两块不同高度，底部推荐四列 ---- */
@media (min-width:1024px){
  .site-wrap{padding:36px 20px 80px}
  .title-row{display:grid;grid-template-columns:1fr 360px;gap:28px;align-items:start}
  .title-row h1{font-size:32px}
  .summary{font-size:15px;margin-top:6px}

  .dashboard-grid{grid-template-columns:repeat(12,1fr);gap:24px;align-items:start}
  .article{grid-column:span 8}
  .side-info{grid-column:span 4;display:flex;flex-direction:column;gap:18px}

  /* side blocks heights differ */
  .info-top{flex:0 0 220px}
  .info-bottom{flex:1 1 120px;overflow:auto}

  .content{font-size:16px;padding:24px}

  /* FAQ 桌面：左问右答表格式 */
  .faq-grid{display:grid;gap:12px}
  /* 假定每个faq项为 .faq-item > .q + .a 的结构，如果源数据不同，仍会自然流式显示 */
  .faq-grid .faq-item{display:grid;grid-template-columns:220px 1fr;column-gap:18px;padding:10px 12px;border-top:1px solid #f0f5f7}
  .faq-grid .faq-item .q{font-weight:600;color:var(--navy)}
  .faq-grid .faq-item .a{color:var(--muted)}

  /* 相关阅读 两列摘要列表 */
  .related-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
  .related-grid > *{background:#fff;border:1px solid #eef3f5;padding:12px}

  .recommend-grid{grid-template-columns:repeat(4,1fr)}
}

/* ---- Mobile (<=767px) 特有重排：信息区成为正文后的两段列表，底部推荐四列变单列 ---- */
@media (max-width:767px){
  .header-inner{padding:12px}
  .nav-index ul{gap:10px}
  .title-row{display:block}
  .title-row h1{font-size:18px}
  .summary{font-size:14px}

  .dashboard-grid{grid-template-columns:1fr}
  .article{grid-column:auto}
  .side-info{grid-column:auto;margin-top:12px}
  .info-top,.info-bottom{background:transparent;border:0;padding:0}
  .info-block{border-left:3px solid var(--navy);padding:10px 12px;background:transparent}

  .content{padding:16px;font-size:15px}

  /* FAQ mobile：左问右答改为堆叠 */
  .faq-grid .faq-item{display:block;border-top:1px solid #f0f5f7;padding:10px 0}
  .faq-grid .faq-item .q{display:block;margin-bottom:6px;font-weight:600;color:var(--navy)}
  .faq-grid .faq-item .a{display:block;color:var(--muted)}

  .related-grid{display:block}
  .related-grid > *{margin-bottom:10px}

  .recommend-grid{grid-template-columns:1fr;}
  .rec{margin-bottom:12px}

  .ad-block{margin:12px 18px}
  .site-wrap{padding:18px 12px 40px}
}

/* Accessibility & fine tuning */
h1,h2,h3{line-height:1.15}

/* Ensure no large radii or heavy shadows; visual signature: large white space + tight typographic steps */
*{border-radius:0}