:root{
  --bg-header:#2e2933; /* 深紫灰 */
  --ivory:#fffaf0;     /* 象牙白 */
  --text:#1e1b20;
  --muted:#6b656b;
  --accent:#5a4d63; /* 较深的点缀色 */
  --container-max:1280px;
  --gap:16px;
  --density-scale:0.9; /* 紧凑感 */
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial;
  box-sizing: border-box;
}
*,*::before,*::after{box-sizing:inherit}
html,body{height:100%;margin:0;color:var(--text);background:var(--ivory);-webkit-text-size-adjust:100%;}
.site-header{background:var(--bg-header);color:var(--ivory);padding:12px 16px;box-shadow:none;border-bottom:4px solid rgba(0,0,0,0.06);}
.toolbar{max-width:var(--container-max);margin:0 auto;display:flex;align-items:center;gap:12px;}
.site-name{color:var(--ivory);text-decoration:none;font-weight:700;font-size:1rem;white-space:nowrap}
.mini-nav{margin-left:12px;color:rgba(255,250,240,0.85);font-size:0.9rem;display:flex;gap:8px;align-items:center}
.mini-nav .nav-item{opacity:0.95}
.mini-nav .nav-sep{opacity:0.6}

.site-main{margin:20px auto;padding:0 16px;width:100%;box-sizing:border-box}
/* 保证桌面端容器在合理宽度区间（对 >=1120px 的屏幕应用固定容器） */
@media (min-width:1120px){
  .site-main{max-width:1200px;margin:28px auto}
}
@media (min-width:1440px){
  .site-main{max-width:1280px}
}

/* TOP split headline */
.split-head{display:grid;grid-template-columns:1fr;gap:12px;align-items:start;margin-bottom:16px}
.split-left{background:transparent;padding:12px}
.split-right{background:transparent;padding:12px}
.page-title{margin:0;font-size:1.7rem;line-height:1.15;text-align:center;font-weight:700}
.meta{margin-top:8px;color:var(--muted);font-size:0.9rem;text-align:center}
.summary{margin:0;color:var(--text);font-size:1rem;line-height:1.4;text-align:left}
.keywords{margin-top:10px;color:var(--muted);font-size:0.9rem}

/* 内容网格：在桌面形成 7/5 两栏 */
.content-grid{display:block}
.article{background:#ffffff;padding:16px;border-radius:2px;border:1px solid rgba(0,0,0,0.04)}
.article-surface{background:#ffffff}
.content{color:var(--text);font-size:1rem;line-height:1.65}
.ad-container{margin:18px 0;padding:12px;background:transparent;border:1px dashed rgba(0,0,0,0.06);color:var(--muted);font-size:0.95rem}

.side-column{margin-top:12px}
.faq{background:#fff;border-top:4px solid var(--accent);padding:12px;margin-bottom:12px}
.faq-head{font-weight:700;margin-bottom:8px}
.faq-body{color:var(--text);font-size:0.95rem;line-height:1.5}
.related{background:#fff;padding:12px;border:1px solid rgba(0,0,0,0.04)}
.related-head{font-weight:700;margin-bottom:8px}
.related-body{font-size:0.95rem;color:var(--muted)}

.site-footer{margin-top:28px;padding:18px 16px;background:transparent;color:var(--muted);font-size:0.9rem}
.footer-inner{max-width:var(--container-max);margin:0 auto;text-align:center}

/* Desktop 特有布局（>=1024px），实现标题与摘要左右各半，以及正文 7/5 两栏；右栏承载 FAQ 和推荐 */
@media (min-width:1024px){
  .split-head{grid-template-columns:1fr 1fr;gap:20px;align-items:start;margin-bottom:22px}
  .split-left{display:flex;flex-direction:column;justify-content:center;padding:28px 20px}
  .split-right{padding:20px}

  /* 标题居中，摘要左对齐（依据 title_composition） */
  .page-title{text-align:center;font-size:2rem}
  .summary{text-align:left;font-size:1.02rem}

  .content-grid{display:grid;grid-template-columns:7fr 5fr;gap:24px;align-items:start}
  .article{order:1}
  .side-column{order:2}

  /* 视觉识别：页头基线与正文基线明显不同 */
  .site-header .toolbar{align-items:flex-start}
  .page-title{transform:translateY(0.2rem)}
}

/* Mobile 特有布局（<=767px），标题与摘要上下排列，正文/FAQ/推荐依序显示；避免横向滚动与重叠 */
@media (max-width:767px){
  :root{--gap:12px}
  .site-header{padding:10px}
  .toolbar{gap:8px}
  .split-head{grid-template-columns:1fr;gap:8px}
  .split-left{padding:8px}
  .split-right{padding:0 8px}
  .page-title{font-size:1.25rem;text-align:center}
  .meta{text-align:center;font-size:0.85rem}
  .summary{text-align:left;font-size:0.95rem}

  .content-grid{display:block}
  .article{padding:12px}
  .side-column{margin-top:10px}
  .faq-head{border-top:4px solid var(--accent);padding-top:8px}
  .related-body{display:block}

  /* 保证在 320px 时无横向滚动 */
  html,body{overflow-x:hidden}
  .site-main{padding-left:12px;padding-right:12px}
}

/* 中间区与块级元素的紧凑密度设置 */
.page-title,.summary,.meta,.content,.faq-body,.related-body{letter-spacing:0.01em}
.page-title{margin-bottom:6px}
.article-surface p{margin:0 0 12px 0}

/* 链接样式保持简洁，禁止发光按钮或渐变 */
a{color:var(--accent);text-decoration:underline}
button{background:none;border:1px solid rgba(0,0,0,0.06);padding:6px 10px;border-radius:2px}

/* 细节：限制大图片或表格不导致横向滚动 */
.article-surface img,.article-surface table{max-width:100%;height:auto}