/* 随笔版式：与「论文里的统计故事」(stories/issue-NN/story.css) 同一套设计语言
   结构由 assets/essay/essay.lua 生成：.cvi-story.cvi-essay > header.hero / nav.toc / .wrap > .card.essay-sec */
.cvi-essay{--ink:#1f2933;--muted:#5f6c7b;--bg:#f7f5f0;--card:#fff;--accent:#b4472b;--accent2:#1f5f8b;--gold:#c99a2e;--green:#2f7d5b;--line:#e4dfd3;
  background:var(--bg);color:var(--ink);font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC","Source Han Sans SC",sans-serif;line-height:1.85;font-size:16.5px;padding-bottom:30px}
.cvi-essay,.cvi-essay *{box-sizing:border-box}
.cvi-essay .wrap{max-width:1020px;margin:0 auto;padding:0 22px}

/* hero */
.cvi-essay header.hero{background:linear-gradient(135deg,#1d2b3a 0%,#2c4a63 60%,#7a3b26 100%);color:#fff;padding:56px 24px 44px}
.cvi-essay .hero .issue{letter-spacing:.25em;font-size:13px;opacity:.8}
.cvi-essay .hero h1{font-family:"Songti SC","STSong","Noto Serif CJK SC","Source Han Serif SC",serif;font-size:36px;line-height:1.4;margin:10px 0 8px;color:#fff;font-weight:700;border:none;padding:0}
.cvi-essay .hero .sub{font-size:18px;opacity:.92}
.cvi-essay .paperbox{margin-top:22px;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.25);border-radius:12px;padding:14px 18px;font-size:15px;line-height:1.8}
.cvi-essay .chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}
.cvi-essay .chips .chip{font-size:13px;color:#ffe2bd;border:1px solid rgba(255,226,189,.55);border-radius:14px;padding:1px 12px;text-decoration:none;background:rgba(255,255,255,.06)}
.cvi-essay .chips .chip:hover{background:rgba(255,255,255,.16);color:#fff}

/* 吸顶胶囊目录 */
.cvi-essay nav.toc{position:sticky;top:var(--cvi-navbar-h,0px);z-index:10;background:rgba(247,245,240,.96);backdrop-filter:blur(6px);border-bottom:1px solid var(--line)}
.cvi-essay nav.toc .wrap{display:flex;gap:4px;overflow-x:auto;padding:8px 22px;scrollbar-width:none}
.cvi-essay nav.toc .wrap::-webkit-scrollbar{display:none}
.cvi-essay nav.toc a{white-space:nowrap;text-decoration:none;color:var(--muted);font-size:14px;padding:4px 12px;border-radius:20px;transition:background .15s,color .15s}
.cvi-essay nav.toc a:hover{background:#ebe5d8;color:var(--ink)}
.cvi-essay nav.toc a.on{background:var(--accent2);color:#fff}

/* 卡片式小节 */
.cvi-essay .card{display:block;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:22px 28px;margin:22px 0;box-shadow:0 2px 10px rgba(0,0,0,.03);color:inherit;min-width:0}
.cvi-essay .card:first-child{margin-top:28px}
.cvi-essay .essay-intro{border-left:6px solid var(--accent2)}
.cvi-essay section{padding:0;scroll-margin-top:120px}
.cvi-essay h2{font-family:"Songti SC","STSong","Noto Serif CJK SC",serif;font-size:26px;font-weight:700;line-height:1.45;border:none;border-left:6px solid var(--accent);padding:0 0 0 14px;margin:4px 0 16px;color:var(--ink)}
.cvi-essay h2 .anchorjs-link,.cvi-essay h3 .anchorjs-link{display:none}
.cvi-essay h3{font-size:19px;font-weight:700;margin:28px 0 8px;color:var(--accent2);border:none;padding-top:14px;border-top:1px dashed var(--line)}
.cvi-essay section > h3:first-of-type{border-top:none;padding-top:0}
.cvi-essay p{margin:10px 0}
.cvi-essay strong{color:#7a2e1b}
.cvi-essay a{color:var(--accent2);text-decoration-thickness:1px;text-underline-offset:3px}
.cvi-essay ul,.cvi-essay ol{margin:10px 0;padding-left:1.4em}
.cvi-essay li{margin:4px 0}
.cvi-essay li::marker{color:var(--accent)}

/* 配图：卡片内的浅底图框 + 图注 */
.cvi-essay .quarto-figure,.cvi-essay figure{margin:18px 0}
.cvi-essay figure{background:#fbf8f1;border:1px solid var(--line);border-radius:12px;padding:12px 12px 8px;text-align:center}
.cvi-essay figure p{margin:0}
.cvi-essay figure img{max-width:min(100%,720px);height:auto;border-radius:6px;background:#fff}
.cvi-essay figcaption{font-size:14px;color:var(--muted);margin-top:8px;line-height:1.7;text-align:center}

/* 引用 = 提示框；代码块 = 可复制的提示词卡 */
.cvi-essay blockquote{background:#fff8ec;border:none;border-left:4px solid #e3a24a;border-radius:6px;padding:10px 14px;margin:14px 0;color:inherit;font-size:inherit}
.cvi-essay blockquote p{margin:4px 0}
.cvi-essay div.sourceCode,.cvi-essay pre{background:#fbf4e2;border:1px solid #ecd9a8;border-left:6px solid var(--gold);border-radius:10px;margin:14px 0}
.cvi-essay pre{padding:12px 16px;white-space:pre-wrap;word-break:break-word;font-family:inherit;font-size:15px;line-height:1.8;color:var(--ink)}
.cvi-essay div.sourceCode pre{border:none;margin:0;background:transparent}
.cvi-essay pre code{white-space:pre-wrap;font-family:inherit;color:inherit;background:none;padding:0}
.cvi-essay code{color:#9a3412;background:#f1ece1;padding:0 4px;border-radius:3px}
.cvi-essay .code-copy-button{top:6px;right:6px}

/* 表格 */
.cvi-essay table{border-collapse:collapse;width:100%;font-size:14.5px;margin:10px 0}
.cvi-essay th,.cvi-essay td{border-bottom:1px solid var(--line);padding:6px 8px}
.cvi-essay th{background:#f1ece1;font-weight:600}

/* 文末二维码 */
.cvi-essay .cvi-follow{margin:30px auto 10px}

@media(max-width:600px){
  .cvi-essay{font-size:15.5px}
  .cvi-essay .wrap{padding:0 12px}
  .cvi-essay header.hero{padding:36px 6px 30px}
  .cvi-essay .hero h1{font-size:25px}
  .cvi-essay .paperbox{font-size:14px;padding:12px 14px}
  .cvi-essay nav.toc .wrap{padding:7px 12px}
  .cvi-essay nav.toc a{font-size:13.5px;padding:3px 10px}
  .cvi-essay .card{padding:16px 15px;margin:16px 0;border-radius:12px}
  .cvi-essay h2{font-size:21px;padding-left:11px;border-left-width:5px}
  .cvi-essay h3{font-size:17.5px}
  .cvi-essay figure{padding:8px 6px 6px}
  .cvi-essay pre{font-size:14px;padding:10px 12px}
}