/* 全局变量与基础重置 */
:root{
  --paper:#f8f5ef; /* 纸白 */
  --ink:#0b2340;   /* 藏蓝 */
  --muted:#6b7480;
  --accent:#174a6b; /* 克制强调色 */
  --max-width-clamp:clamp(1120px,80vw,1440px);
  --content-gutter:28px;
  --serif: Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}
*{box-sizing:border-box}
html,body{height:100%;margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);-webkit-font-smoothing:antialiased}
.page-root{min-height:100vh;display:flex;flex-direction:column;align-items:stretch}

/* 左侧纵向刊头（仅桌面可见） */
.vertical-mast{display:none}
.vertical-text{writing-mode:vertical-rl;text-orientation:mixed;transform:rotate(180deg);font-weight:700;color:var(--muted);letter-spacing:2px}

/* 头部：居中刊头与横线导航 */
.page-header{padding:20px 0 8px;background:linear-gradient(180deg,rgba(0,0,0,0.01),transparent)}
.masthead{max-width:var(--max-width-clamp);margin:0 auto;padding:0 20px;text-align:center}
.mast-title{font-family:var(--serif);font-size:20px;color:var(--ink);letter-spacing:1px}
.mast-rule{height:1px;background:var(--ink);opacity:0.08;margin:12px auto 10px;width:60%}
.top-nav{font-size:13px;color:var(--muted);display:inline-flex;gap:14px}
.top-nav .nav-item{opacity:0.9}

/* 容器与排版基准 */
.layout-container{display:flex;justify-content:center;padding:18px 12px 40px}
.edition-article{display:block;width:var(--max-width-clamp);padding:0 20px;display:grid;grid-template-columns:1fr;gap:24px}

.article-head{max-width:980px;margin:0 auto}
.article-title{font-family:var(--serif);font-weight:700;font-size:42px;line-height:1.06;margin:6px 0 10px;color:var(--ink);text-align:center;word-break:break-word}
.article-title::first-letter{color:var(--accent)}
.meta{font-size:13px;color:var(--muted);display:flex;gap:8px;justify-content:center}
.summary{max-width:880px;margin:16px auto 0;color:var(--muted);line-height:1.65;text-align:center}

.article-body{max-width:880px;margin:18px auto;color:var(--ink);line-height:1.78;font-size:17px}
.article-body p{margin:0 0 14px}

/* 广告容器，保持独立且不可遮挡正文 */
.ad{max-width:var(--max-width-clamp);margin:18px auto;padding:10px;text-align:center;color:var(--muted);font-size:13px}
.ad--top{margin-bottom:6px}
.ad--middle{margin-top:8px;margin-bottom:8px}
.ad--bottom{margin-top:18px}

/* 信息区（FAQ 与相关阅读）在 DOM 中位于正文之后，桌面呈右侧注释栏） */
.article-info{max-width:880px;margin:0 auto 20px;padding-top:6px;border-top:0}
.faq{margin-bottom:18px}
.faq-deco{height:3px;background:var(--accent);width:44px;margin-bottom:8px}
.faq h2{margin:0 0 8px;font-size:16px;color:var(--ink);font-family:var(--sans)}
.related h3{margin:8px 0 8px;font-size:15px;color:var(--ink)}
.related-list{border-top:1px solid rgba(11,35,64,0.06);padding-top:10px}
.related-list > *{display:block;padding:10px 0;border-bottom:1px solid rgba(11,35,64,0.04);color:var(--muted);font-size:14px}

.page-footer{border-top:1px solid rgba(11,35,64,0.04);padding:18px 0;background:transparent}
.footer-row{max-width:var(--max-width-clamp);margin:0 auto;padding:0 20px;color:var(--muted);font-size:13px}

/* 桌面布局：居中报头与窄标题，正文从中轴向两侧形成主列和注释栏；整体克制对称 */
@media (min-width:1024px){
  .vertical-mast{display:block;position:fixed;left:18px;top:40%;transform:translateY(-50%);width:44px}
  .layout-container{padding-left:88px}
  .edition-article{display:grid;grid-template-columns:1fr 420px;gap:44px;align-items:start}
  .article-head{grid-column:1/2;align-self:start;padding-right:20px}
  .article-body{grid-column:1/2;margin:0;padding-right:14px}
  .article-info{grid-column:2/3;max-width:none;margin:0;padding-left:24px}
  .article-title{font-size:48px;text-align:center;max-width:720px;margin-left:auto;margin-right:auto}
  .summary{text-align:center}
  .ad{margin-left:auto;margin-right:auto}
}

/* 手机端单列左对齐；中轴布局解除；避免窄正文 */
@media (max-width:767px){
  html,body{font-size:15px}
  .vertical-mast{display:none}
  .masthead{text-align:left;padding:0 16px}
  .mast-rule{width:28%}
  .top-nav{display:inline-flex;gap:12px}
  .layout-container{padding:8px 12px}
  .edition-article{width:100%;grid-template-columns:1fr;gap:10px}
  .article-head{padding:0}
  .article-title{font-size:22px;text-align:left;margin:6px 0}
  .article-title::first-letter{font-size:1.1em}
  .meta{justify-content:flex-start;padding-bottom:6px}
  .summary{text-align:left;margin-top:8px}
  .article-body{font-size:16px;padding:0;margin-top:10px}
  .article-info{padding-top:14px}
  .related-list > *{padding:12px 0}
  .ad{padding:8px}
  .page-footer{text-align:left;padding:14px 12px}
  /* 确保在最窄屏（320px）无横向滚动 */
  body{overflow-x:hidden}
}

/* 细节：可读性与节奏 */
.article-body strong{color:var(--ink)}
.article-body em{color:var(--muted)}

/* Accessibility */
.masthead .nav-item{outline-offset:4px}