:root{--bg:#faf6ef;--ink:#23202a;--accent:#4b2f62;--muted:#6b6770;--line:#e6e0d7;--vline:#4b2f62;--max-w:1280px;--gap:28px;--font-stack: -apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,"Noto Sans CJK SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;}
*{box-sizing:border-box}
html,body{height:100%;background:var(--bg);color:var(--ink);font-family:var(--font-stack);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;}
body{margin:0;line-height:1.45}
.visually-hidden{position:absolute!important;height:1px;width:1px;overflow:hidden;clip:rect(1px,1px,1px,1px);white-space:nowrap}
.site-header{padding:10px 20px;border-bottom:1px solid var(--line);background:transparent}
.header-inner{max-width:var(--max-w);margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:12px}
.masthead-left{display:flex;flex-direction:column}
.home-link{font-weight:700;color:var(--accent);text-decoration:none;font-size:14px}
.site-path{font-size:12px;color:var(--muted);margin-top:4px}
.col-index{display:flex;gap:12px;font-size:13px;color:var(--muted)}
.col-index span{padding:6px 8px;border-radius:4px}
.ad{max-width:var(--max-w);margin:8px auto;padding:6px 10px;color:var(--muted);font-size:13px;background:transparent;border:1px dashed var(--line)}
.page-wrapper{max-width:1440px;margin:18px auto;padding:0 20px;position:relative}
/* 贯穿页面的1px主题竖线 */
.vline{position:absolute;left:calc(20px + 78px);top:0;bottom:0;width:1px;background:var(--vline);opacity:0.06;pointer-events:none}
/* 布局 */
.layout-grid{display:grid;grid-template-columns:1fr;gap:var(--gap);max-width:var(--max-w);margin:0 auto}
.content-area{background:transparent;padding:0}
.article-header{padding:6px 4px 12px}
.article-title{font-size:22px;line-height:1.15;margin:0 0 8px 0;font-weight:700;text-align:left}
/* 标题粗细横线构图（细横线与粗横线） */
.title-rules{height:10px;margin-top:-6px;margin-bottom:12px;position:relative}
.title-rules::before{content:'';display:block;height:2px;background:var(--accent);width:44px}
.title-rules::after{content:'';display:block;height:1px;background:var(--line);width:100%;margin-top:6px}
.meta-row{font-size:13px;color:var(--muted);display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.summary{margin:12px 0 18px;color:var(--ink);max-width:78ch}
.article-body{color:var(--ink);font-size:16px;line-height:1.7}
.article-body p{margin:0 0 16px}
.faq{margin-top:22px}
.faq-list{border-top:1px solid var(--line)}
/* faq_pattern: 横线问答列表 */
.faq-list > *{padding:12px 0;border-bottom:1px solid var(--line)}
/* 侧栏 */
.side-area{display:none}
.aside-block{padding:8px}
.aside-title{font-size:13px;color:var(--accent);font-weight:600;margin-bottom:8px}
.aside-toc{list-style:none;padding:0;margin:0;color:var(--muted);font-size:14px}
.aside-toc li{padding:6px 0}
.related-list-side{list-style:none;padding:0;margin:0;color:var(--muted);font-size:14px}
.related-bottom{max-width:var(--max-w);margin:30px auto}
.related-grid{display:grid;grid-template-columns:1fr;gap:12px}
.related-grid > *{padding:12px;border-top:1px solid var(--line);font-size:14px;color:var(--muted)}
.site-footer{border-top:1px solid var(--line);margin-top:28px;padding:18px 0;color:var(--muted);font-size:13px}
.footer-inner{max-width:var(--max-w);margin:0 auto}
/* 阅读密度与可视节奏 */
.article-body blockquote{border-left:3px solid var(--line);padding-left:12px;color:var(--muted);margin:12px 0}
/* small screens (mobile) - distinct layout */
@media (max-width:767px){
  .page-wrapper{padding:0 12px}
  .vline{display:none}
  .header-inner{padding:0;margin:0}
  .col-index{display:flex;gap:8px;font-size:12px}
  .article-title{font-size:18px}
  .title-rules::before{width:34px}
  .article-body{font-size:15px;line-height:1.6}
  .layout-grid{grid-template-columns:1fr}
  .side-area{display:none}
  .related-grid{grid-template-columns:repeat(1,1fr)}
  .related-grid > *{border-top:1px solid var(--line);padding:10px}
  .ad{margin:8px 0}
  /* mobile_contract: 站名、标题、摘要和正文紧凑连续，避免首屏空白 */
  .site-header{padding:8px 0}
  .article-header{padding-top:6px}
}
/* desktop rules: distinct two-column editorial grid */
@media (min-width:1024px){
  .page-wrapper{padding:0 24px}
  .layout-grid{grid-template-columns:2.2fr 1fr;align-items:start;gap:36px}
  .side-area{display:block;border-left:1px solid var(--line);padding-left:18px}
  .content-area{padding-right:8px}
  .article-title{font-size:28px}
  .title-rules::before{width:64px}
  .article-body{font-size:17px;line-height:1.8}
  /* 正文和FAQ采用宽窄交替布局：FAQ在窄列中（侧栏）并以窄列显示 */
  .faq{display:none}
  .related-desktop{display:block}
  .related-bottom{margin-top:30px}
  /* 底部三列短卡 */
  .related-grid{grid-template-columns:repeat(3,1fr);gap:16px}
  .related-grid > *{border-top:0;padding:12px;background:transparent;border-left:1px solid var(--line);}
}
/* 保持 320px 无横向滚动 */
@media (max-width:320px){
  html,body{min-width:0}
  .page-wrapper{padding:0 8px}
}