/* Theme variables: 海军蓝与浅雾灰 */
:root{
  --navy: #0b3a66;
  --mist: #f4f6f7;
  --text: #222529;
  --muted: #6b7278;
  --accent: #0b3a66;
  --gap: 18px;
  --max-center: 780px; /* 正文居中约780px */
  --font-sans: system-ui,-apple-system,Segoe UI,Roboto,'Helvetica Neue',Arial;
  --font-serif: Georgia,'Times New Roman',serif;
}

/* Basic page reset */
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  color:var(--text);
  background:var(--mist);
  font-family: var(--font-serif);
  line-height:1.58;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}

/* Header: 报刊双层报头，第二层极窄 */
.site-header{background:#fff;border-bottom:1px solid #e6eaee}
.masthead-outer{max-width:100%;padding:14px 18px}
.masthead{display:flex;align-items:center;justify-content:space-between}
.site-brand{font-weight:700;color:var(--navy);font-size:18px}
.header-meta{color:var(--muted);font-size:13px}
.masthead-slim{background:transparent;border-top:0;padding:6px 0;color:var(--muted);font-size:12px;display:flex;justify-content:space-between}
.masthead-slim .kw{color:var(--accent)}

/* Page container and 3-track grid for desktop */
.page{margin:20px auto;padding:8px}
.layout-grid{display:block}

/* Columns */
.col-left,.col-center,.col-right{background:transparent}

/* Article title composition: 标题与摘要左右分置 on desktop */
.article-head{background:#fff;padding:18px;border-bottom:1px solid #e9eef2}
.title-area{display:block}
.title{margin:0 0 6px 0;font-size:26px;line-height:1.12;color:var(--navy);font-family:var(--font-serif)}
.summary{color:var(--muted);font-size:15px}

.content{background:#fff;padding:20px 18px;color:var(--text);font-size:15px}
.content p{margin:0 0 12px}

/* Ad slots are independent, static blocks */
.ad-slot{background:transparent;padding:12px;margin:12px 0;text-align:center;color:var(--muted);font-size:13px}
.ad-slot *{pointer-events:none}

/* FAQ pattern: 主题色顶部边线问答区 */
.faq{background:#fff;margin-top:18px}
.faq-inner{border-top:4px solid var(--navy);padding:14px 18px}
.faq-title{margin:0 0 10px 0;font-size:16px;color:var(--navy)}
.faq-content{color:var(--text);font-size:14px}

/* Related: visual_signature 使用反向色块标题栏 */
.related{margin-top:18px}
.related-header{background:var(--navy);color:#fff;padding:10px 14px;font-weight:600}
.related-list{background:#fff;padding:12px 14px;border-top:1px solid #e9eef2}
.related-list .item{display:flex;justify-content:space-between;padding:10px 0;border-bottom:1px dashed #edf2f4}
.related-list .item:last-child{border-bottom:0}
.related-list .item .title{color:var(--text)}
.related-list .item .meta{color:var(--muted);font-size:12px}

/* Right index: compact list with subtle separators (带日期的分隔线列表 由内容提供日期) */
.col-right .right-index{background:#fff;padding:14px}
.index-title{font-weight:700;color:var(--navy);margin-bottom:8px}
.index-list .idx-item{padding:8px 0;border-bottom:1px solid #f0f3f5}
.index-list .idx-item:last-child{border-bottom:0}

.site-footer{padding:18px;text-align:center;color:var(--muted);font-size:13px}

/* Desktop specific layout (1024px and above). 必须包含 @media (min-width: 1024px) */
@media (min-width:1024px){
  .page{width:clamp(1120px,90vw,1440px);margin:26px auto}
  .layout-grid{display:grid;grid-template-columns:220px 1fr 300px;gap:26px;align-items:start}

  /* center column constrained to ~780px */
  .col-center{max-width:var(--max-center);min-width:560px}
  .col-left{position:relative}
  .col-right{position:relative}

  /* Title and summary side-by-side */
  .title-area{display:grid;grid-template-columns:1fr 320px;gap:18px;align-items:center}
  .title{font-size:30px}
  .summary{font-size:15px;color:var(--muted)}

  /* Right index styled as concise rail */
  .right-index{position:sticky;top:26px}
}

/* Mobile specific layout (max-width: 767px). 必须包含 @media (max-width: 767px) */
@media (max-width:767px){
  body{font-size:15px}
  .page{padding:12px}
  .layout-grid{display:block}
  .article-head{padding:12px}
  .title-area{display:block}
  .title{font-size:20px}
  .summary{margin-top:8px}

  /* 两侧信息全部移动到正文之后，正文宽度占满安全区域。侧栏改为文章末尾区块 */
  .col-left,.col-right{display:block}
  .col-left{order:2}
  .col-center{order:1}
  .col-right{order:3}

  /* Ensure no horizontal scroll at 320px */
  html,body{overflow-x:hidden}
  .content{padding:14px}
  .faq-inner{padding:12px}
  .related-header{padding:8px}
}

/* Density: 紧凑，调整小间距，但保持人文杂志风格 */
.title, .article-head, .content, .related-list, .right-index{letter-spacing:0.01em}

/* Accessibility tweaks */
h1{line-height:1.08}
.time, time{font-size:13px;color:var(--muted)}