/* 基础变量与重置 */
:root{
  --bg: #fbf8f3; /* 纸白 */
  --text: #0f1720;
  --muted: #6b7178;
  --accent: #282c43; /* 设计种子色，藏蓝 */
  --line: #e6e4df;
  --max-width: 1280px; /* 在 1120-1440 的中间 */
  --gap: 28px;
}
*{box-sizing:border-box}
html,body{height:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text);line-height:1.7;margin:0;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
.sr{position:absolute;left:-9999px}

/* 报刊双层报头 */
.masthead{border-bottom:1px solid var(--line);background:transparent}
.masthead-top{max-width:var(--max-width);margin:0 auto;padding:18px 20px;display:flex;align-items:center;justify-content:space-between}
.brand{font-weight:700;letter-spacing:0.02em;color:var(--text)}
.masthead-info{color:var(--muted);font-size:0.95rem}
.masthead-bar{height:6px;background:linear-gradient(90deg, rgba(40,44,67,0.06), rgba(40,44,67,0.03));max-width:var(--max-width);margin:0 auto}

/* 页面容器 */
.page-wrap{max-width:var(--max-width);margin:24px auto;padding:0 20px}
.ad{background:transparent;padding:10px 0;text-align:center;color:var(--muted);font-size:0.95rem}

/* 文章头部：大标题与窄元信息列 */
.article-head{display:flex;flex-direction:column;gap:12px;margin-bottom:12px}
.article-head h1{font-size:1.6rem;margin:0;font-weight:800;letter-spacing:-0.01em}
.article-head h1::first-letter{color:var(--accent)} /* 视觉识别：首字强调色 */
.meta{display:flex;flex-wrap:wrap;gap:10px;color:var(--muted);font-size:0.92rem}
.meta .now{margin-left:auto}
.summary{margin:12px 0 18px;padding-right:6px;color:var(--muted)}

/* 栅格布局：正文8/4分栏 */
.layout-grid{display:grid;grid-template-columns:1fr;gap:var(--gap)}
.col-main{order:1}
.col-side{order:2}

.content{font-size:1rem;color:var(--text)}
.content p{margin:0 0 1em}
.content h2{margin:1.2em 0 0.6em;font-size:1.05rem}

/* 侧边索引与块状元素，表面无容器风格：用边线与留白分隔 */
.col-side{padding-left:0}
.index{border-top:1px solid var(--line);padding-top:14px;margin-bottom:18px}
.index h2{font-size:0.95rem;margin:0 0 8px}
.index ul{list-style:none;padding:0;margin:0;color:var(--muted)}
.index li{padding:6px 0;border-bottom:1px dashed var(--line);font-size:0.95rem}
.side-desc{display:block;color:var(--muted)}
.faq-block{border-top:1px solid var(--line);padding-top:14px;margin-bottom:18px}
.faq-block h2{margin:0 0 8px}
.faq-list{display:grid;grid-template-columns:1fr;gap:10px}
.faq-list > *{padding:8px 0;border-bottom:1px dashed var(--line);color:var(--muted)}
.related-block{border-top:1px solid var(--line);padding-top:14px}
.related-list{display:grid;grid-template-columns:1fr;gap:10px}
.related-list > *{padding:6px 0;border-bottom:1px dashed var(--line);color:var(--muted)}

/* 可访问性：突出链接元素 */
article a{color:var(--accent);text-decoration:underline}

/* Footer */
.site-footer{max-width:var(--max-width);margin:28px auto;padding:16px 20px;border-top:1px solid var(--line);color:var(--muted);font-size:0.95rem}

/* --- 桌面规则（>=1024px）--- */
@media (min-width:1024px){
  :root{--gap:36px}
  .page-wrap{margin:36px auto;padding:0 28px}
  .article-head{flex-direction:row;align-items:flex-end;gap:20px}
  .article-head h1{font-size:2.6rem;line-height:1.03;flex:1 1 auto}
  .article-head h1::first-letter{font-size:1.04em;color:var(--accent)}
  .article-head .meta{flex:0 0 220px;flex-direction:column;align-items:flex-end;text-align:right}
  .article-head .meta .now{margin-left:0}

  /* 8/4 非对称网格 */
  .layout-grid{grid-template-columns:2fr 1fr;gap:44px;align-items:start}
  .col-main{order:1}
  .col-side{order:2}

  /* 内容更宽松 */
  .content{font-size:1.03rem}
  .content h2{font-size:1.1rem}

  /* FAQ 两列 */
  .faq-list{grid-template-columns:1fr 1fr;gap:12px}

  /* 相关阅读两列摘要列表 */
  .related-list{grid-template-columns:1fr 1fr;gap:12px}

  /* 将手机相关块隐藏；桌面侧边显示 */
  .mobile-follow{display:none}
  .desktop-related{display:block}
}

/* --- 手机规则（<=767px）--- */
@media (max-width:767px){
  :root{--gap:18px}
  .page-wrap{margin:14px auto;padding:0 16px}
  .masthead-top{padding:12px 16px}
  .masthead-bar{height:4px}
  .article-head{gap:8px}
  .article-head h1{font-size:1.3rem}
  .article-head .meta{flex-direction:row;gap:8px;align-items:center}
  .article-head .meta .now{margin-left:0}

  /* 单列：侧栏下移（自然区块顺序） */
  .layout-grid{grid-template-columns:1fr}
  .col-main{order:1}
  .col-side{order:2;margin-top:18px}

  /* FAQ 单列 */
  .faq-list{grid-template-columns:1fr}

  /* 相关阅读在主列以单列形式出现；侧边的相关阅读隐藏 */
  .mobile-only{display:block}
  .desktop-related{display:none}

  /* 保证最小可读宽度，避免横向滚动 */
  body{word-wrap:break-word}
}

/* 禁止常见禁用样式：无发光按钮、无大圆角、无渐变色调强调 */
button, .btn{background:none;border:1px solid var(--line);padding:6px 10px;border-radius:4px;color:var(--text)}