:root{
  --bg:#f7f9fa; /* 青灰基层 */
  --panel:#ffffff;
  --muted:#6b7176;
  --line:#e1e6e8; /* 细灰线 */
  --accent:#3fa4c9; /* 湖蓝 */
  --text:#111215;
  --max-desktop:1280px; /* 中心限制，满足1120-1440范围的折中 */
  --gap:18px; /* 紧凑密度 */
  --nav-height:48px;
  --min-tap:44px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans CJK SC", "PingFang SC", "Hiragino Sans GB", sans-serif;
  color-scheme: light;
}
/* 基础重置与布局 */
*{box-sizing:border-box}
html,body{height:100%;margin:0;background:var(--bg);color:var(--text);}
a{color:inherit;text-decoration:none}
.container{margin:0 auto;padding:20px;}
.site-header{display:flex;align-items:center;justify-content:space-between;padding:12px 0;border-bottom:1px solid var(--line);background:transparent}
.brand{display:flex;align-items:baseline;gap:12px}
.home-link{font-weight:700;font-size:16px;color:var(--text)}
.site-name{font-size:12px;color:var(--muted)}
.nav-index{display:flex;gap:10px;align-items:center;overflow:auto;-webkit-overflow-scrolling:touch}
.nav-item{padding:6px 10px;font-size:14px;color:var(--muted);min-height:var(--min-tap);display:inline-flex;align-items:center}
.nav-item:hover{color:var(--text)}
.page-frame{padding-bottom:28px}
.layout{display:grid;grid-template-columns:1fr;gap:18px}
.main-article{min-width:0}
.article{background:var(--panel);border:1px solid var(--line);padding:18px;border-radius:2px}
.article-header h1{font-size:26px;margin:0 0 8px 0;line-height:1.18;font-weight:700}
.meta-row{font-size:13px;color:var(--muted);display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:12px}
.pipe{color:var(--line)}
.summary{display:flex;align-items:flex-start;margin-bottom:14px}
.summary-band{display:inline-block;width:6px;height:20px;background:var(--accent);margin-right:10px;border-radius:1px}
.summary-text{margin:0;color:var(--muted);font-size:15px}
.content{font-size:16px;line-height:1.75;color:var(--text)}
.content p{margin:0 0 12px 0}
.section-title{font-size:16px;margin:18px 0 10px 0}
.faq-list details{border-top:1px solid var(--line);padding:10px 0}
.faq-list summary{cursor:pointer;font-weight:600}
.related-grid{display:grid;grid-template-columns:repeat(1,1fr);gap:10px}
.related-grid > *{border:1px solid var(--line);padding:10px;background:transparent;border-radius:2px}
.sidebar{order:2}
.side-block{border:1px solid var(--line);padding:12px;background:var(--panel);margin-bottom:12px}
.side-title{font-weight:700;font-size:13px;margin-bottom:8px}
.side-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:6px}
.side-list li{font-size:14px;color:var(--muted)}
.ad-slot{border:1px dashed var(--line);padding:10px;text-align:center;background:transparent;color:var(--muted);font-size:13px}
.ad-top,.ad-bottom{max-width:100%;margin:0 0 12px 0}
.ad-middle{margin:12px 0}
.site-footer{border-top:1px solid var(--line);padding:12px 20px;background:transparent;color:var(--muted);font-size:13px}
.footer-inner{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}
.footer-note{opacity:0.9}

/* 手机端规则：独立重排，侧栏下移，导航允许横向滚动或精简，点击区不小于44px */
@media (max-width:767px){
  .container{padding:12px}
  .nav-index{gap:8px}
  .nav-item{padding:0 8px;height:var(--min-tap);min-width:44px;display:inline-flex;align-items:center}
  .layout{grid-template-columns:1fr;gap:12px}
  .article{padding:14px}
  .article-header h1{font-size:20px}
  .summary-band{width:6px;height:18px;margin-right:8px}
  .related-grid{grid-template-columns:repeat(1,1fr)}
  .sidebar{order:3}
  .side-block{padding:10px}
  .meta-row{font-size:12px}
}

/* 桌面端规则：宽主栏 + 窄侧栏，非对称网格；内容容器在允许的屏幕下向 1120px—1440px 区间靠近 */
@media (min-width:1024px){
  .container{max-width:var(--max-desktop);padding:30px 16px}
  /* 当屏幕足够大时确保容器至少为1120px */
  @media (min-width:1120px){
    .container{max-width:1280px;width:1120px}
  }
  .layout{grid-template-columns: 1fr 320px;align-items:start;gap:22px}
  .article{padding:22px}
  .article-header h1{font-size:32px}
  .summary-text{font-size:15px}
  .related-grid{grid-template-columns:repeat(3,1fr);gap:12px}
  .related-grid > *{padding:10px}
  .sidebar{position:static}
  .nav-index{gap:12px}
}

/* 可读性与无渐变、方角、细线风格保障 */
button,input,select,textarea{font-family:inherit}
/* 强调可触控区域 */
.nav-item, .side-list li, .side-block .side-title{min-height:var(--min-tap);display:flex;align-items:center}