:root{
  --dfm-bg:#0b1622; --dfm-surface:#11202f; --dfm-surface2:#16293b;
  --dfm-primary:#2dd4bf; --dfm-accent:#f5b942; --dfm-text:#e7eef5;
  --dfm-muted:#9fb3c8; --dfm-line:#22405a; --dfm-inset:0px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--dfm-bg);color:var(--dfm-text);
  font-family:-apple-system,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  line-height:1.75;font-size:16px}
a{color:var(--dfm-primary);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}
/* 导航 */
.dfm-nav{position:sticky;top:0;z-index:60;background:rgba(11,22,34,.92);
  backdrop-filter:blur(8px);border-bottom:1px solid var(--dfm-line)}
.dfm-nav-inner{max-width:1180px;margin:0 auto;display:flex;align-items:center;
  justify-content:space-between;padding:12px 20px}
.dfm-brand{color:var(--dfm-text);font-weight:700;font-size:18px;letter-spacing:.5px}
.dfm-brand:hover{text-decoration:none;color:var(--dfm-primary)}
.dfm-menu{display:flex;gap:6px;list-style:none;margin:0;padding:0}
.dfm-menu>li{position:relative}
.dfm-menu>li>a{display:block;padding:8px 14px;color:var(--dfm-text);border-radius:8px}
.dfm-menu>li>a:hover{background:var(--dfm-surface2);text-decoration:none}
.dfm-has-sub .dfm-drop{display:none;position:absolute;top:100%;left:0;min-width:200px;
  background:var(--dfm-surface);border:1px solid var(--dfm-line);border-radius:10px;
  padding:8px;box-shadow:0 10px 30px rgba(0,0,0,.4)}
.dfm-has-sub:hover .dfm-drop{display:block}
.dfm-sub{display:block;padding:8px 10px;color:var(--dfm-muted);border-radius:6px;font-size:14px}
.dfm-sub:hover{background:var(--dfm-surface2);color:var(--dfm-primary)}
.dfm-burger{display:none;background:none;border:1px solid var(--dfm-line);color:var(--dfm-text);
  font-size:22px;border-radius:8px;width:42px;height:38px;cursor:pointer}
/* 主体 */
.dfm-main{max-width:1180px;margin:0 auto;padding:0 20px}
.dfm-doc{display:grid;grid-template-columns:1fr 240px;gap:36px;padding:24px 0}
.dfm-doc-col{min-width:0}
.dfm-crumbs{font-size:13px;color:var(--dfm-muted);padding:14px 0 6px;margin-bottom:8px}
.dfm-crumbs a{color:var(--dfm-muted)}
.dfm-cr-sep{margin:0 8px;color:var(--dfm-line)}
/* 摘要块 */
.dfm-summary{background:linear-gradient(180deg,var(--dfm-surface),var(--dfm-surface2));
  border-left:4px solid var(--dfm-primary);border-radius:0 10px 10px 0;
  padding:16px 20px;margin:0 0 22px;color:#dbe9f2}
.dfm-summary-tag{display:inline-block;background:var(--dfm-primary);color:#06241f;
  font-size:12px;font-weight:700;padding:2px 8px;border-radius:6px;margin-right:8px}
.dfm-doc h1{font-size:30px;line-height:1.3;margin:6px 0 14px}
.dfm-doc h2{font-size:22px;margin:30px 0 12px;color:#fff;
  border-left:3px solid var(--dfm-accent);padding-left:12px}
.dfm-doc h3{font-size:18px;margin:22px 0 10px;color:var(--dfm-primary)}
.dfm-doc p{margin:12px 0}
.dfm-doc ul,.dfm-doc ol{padding-left:22px;margin:12px 0}
.dfm-doc li{margin:6px 0}
.dfm-doc blockquote{margin:14px 0;padding:10px 16px;border-left:3px solid var(--dfm-line);
  background:var(--dfm-surface);color:var(--dfm-muted);border-radius:0 8px 8px 0}
.dfm-doc code{background:var(--dfm-surface2);padding:1px 6px;border-radius:5px;font-size:14px}
.dfm-doc pre{background:#06121c;padding:14px;border-radius:10px;overflow:auto}
.dfm-doc pre code{background:none;padding:0}
.dfm-doc hr{border:none;border-top:1px solid var(--dfm-line);margin:24px 0}
/* 表格 */
.dfm-table-wrap{overflow-x:auto;margin:16px 0}
.dfm-table-wrap table{border-collapse:collapse;width:100%;font-size:14px}
.dfm-table-wrap th,.dfm-table-wrap td{border:1px solid var(--dfm-line);
  padding:8px 12px;text-align:left}
.dfm-table-wrap th{background:var(--dfm-surface2);color:var(--dfm-primary)}
.dfm-table-wrap tr:nth-child(even) td{background:rgba(255,255,255,.02)}
/* TOC */
.dfm-toc{position:sticky;top:80px;align-self:start;
  background:var(--dfm-surface);border:1px solid var(--dfm-line);border-radius:12px;
  padding:16px;font-size:13px;max-height:calc(100vh - 100px);overflow:auto}
.dfm-toc-title{font-weight:700;color:var(--dfm-accent);margin-bottom:10px}
.dfm-toc ul{list-style:none;margin:0;padding:0}
.dfm-toc li{margin:7px 0}
.dfm-toc a{color:var(--dfm-muted)}
.dfm-toc a:hover{color:var(--dfm-primary)}
/* FAQ */
.dfm-faq{margin:30px 0 10px}
.dfm-faq-h{border-left-color:var(--dfm-primary)!important}
.dfm-faq-item{background:var(--dfm-surface);border:1px solid var(--dfm-line);
  border-radius:10px;margin:10px 0;padding:4px 16px}
.dfm-faq-item summary{cursor:pointer;font-weight:600;padding:12px 0;color:#fff}
.dfm-faq-a{padding:0 0 14px;color:#cfe0ec}
/* 相关阅读 */
.dfm-related{margin:30px 0}
.dfm-related-h{border-left-color:var(--dfm-primary)!important}
.dfm-related ul{list-style:none;padding:0;display:grid;gap:10px}
.dfm-related li a{display:block;background:var(--dfm-surface);border:1px solid var(--dfm-line);
  border-radius:10px;padding:12px 16px}
.dfm-related li a:hover{border-color:var(--dfm-primary)}
/* 列表页 */
.dfm-listpage{padding:24px 0}
.dfm-list-head{padding:18px 0 22px}
.dfm-list-head h1{font-size:28px;margin:8px 0}
.dfm-list-head p{color:var(--dfm-muted);margin:0}
.dfm-card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.dfm-card{background:var(--dfm-surface);border:1px solid var(--dfm-line);border-radius:14px;
  padding:18px 20px;color:var(--dfm-text);transition:.2s;display:flex;flex-direction:column;gap:8px}
.dfm-card:hover{transform:translateY(-3px);border-color:var(--dfm-primary);text-decoration:none}
.dfm-card-title{font-size:17px;font-weight:700;color:#fff}
.dfm-card-desc{font-size:14px;color:var(--dfm-muted);flex:1}
.dfm-card-cat{font-size:12px;color:var(--dfm-accent)}
/* 首页 hero */
.dfm-hero{background:radial-gradient(1200px 400px at 70% -10%,rgba(45,212,191,.18),transparent),
  linear-gradient(180deg,var(--dfm-surface),var(--dfm-bg));
  border:1px solid var(--dfm-line);border-radius:18px;padding:48px 40px;margin:24px 0}
.dfm-hero h1{font-size:34px;margin:0 0 14px;line-height:1.3}
.dfm-hero p{color:var(--dfm-muted);max-width:760px;font-size:17px}
.dfm-hero .dfm-cta{display:inline-block;margin-top:18px;background:var(--dfm-primary);
  color:#06241f;font-weight:700;padding:12px 22px;border-radius:10px}
.dfm-hero .dfm-cta:hover{text-decoration:none;filter:brightness(1.08)}
.dfm-section{margin:34px 0}
.dfm-section h2{font-size:24px;color:#fff;border-left:3px solid var(--dfm-accent);padding-left:12px;margin:0 0 18px}
.dfm-line-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.dfm-line{background:var(--dfm-surface);border:1px solid var(--dfm-line);border-radius:14px;padding:18px}
.dfm-line h3{margin:0 0 8px;color:var(--dfm-primary);font-size:16px}
.dfm-line p{font-size:13px;color:var(--dfm-muted);margin:0}
.dfm-scenario{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.dfm-sc{background:var(--dfm-surface);border:1px solid var(--dfm-line);border-radius:12px;padding:16px}
.dfm-sc h4{margin:0 0 6px;color:var(--dfm-accent);font-size:15px}
.dfm-sc p{margin:0;font-size:13px;color:var(--dfm-muted)}
.dfm-baseline{overflow-x:auto;margin:18px 0}
.dfm-baseline table{border-collapse:collapse;width:100%;font-size:13px}
.dfm-baseline th,.dfm-baseline td{border:1px solid var(--dfm-line);padding:8px 10px;text-align:left}
.dfm-baseline th{background:var(--dfm-surface2);color:var(--dfm-primary)}
/* 叶子页 */
.dfm-leaf{padding:24px 0}
.dfm-leaf h1{font-size:30px;margin:8px 0 18px}
.dfm-leaf h2{font-size:22px;color:#fff;border-left:3px solid var(--dfm-accent);padding-left:12px;margin:28px 0 12px}
.dfm-leaf p{color:#dbe9f2}
.dfm-kw{display:flex;flex-wrap:wrap;gap:10px;margin:14px 0}
.dfm-kw span{background:var(--dfm-surface);border:1px solid var(--dfm-line);border-radius:20px;
  padding:6px 14px;font-size:13px;color:var(--dfm-muted)}
/* 悬浮胶囊 */
.dfm-float{position:fixed;right:18px;top:50%;transform:translateY(-50%);z-index:70;
  display:flex;flex-direction:column;gap:12px}
.dfm-fbtn{width:54px;height:54px;border-radius:27px;border:none;cursor:pointer;
  background:linear-gradient(135deg,var(--dfm-primary),#1aa897);color:#06241f;
  font-weight:700;font-size:14px;box-shadow:0 8px 24px rgba(45,212,191,.35)}
.dfm-fbtn:hover{filter:brightness(1.08)}
.dfm-fwechat{background:linear-gradient(135deg,var(--dfm-accent),#e09a1f);color:#3a2600}
.dfm-wx-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.6);
  z-index:90;align-items:center;justify-content:center}
.dfm-wx-overlay.active{display:flex}
.dfm-wx-card{position:relative;background:#fff;border-radius:12px;padding:8px;
  box-shadow:0 20px 60px rgba(0,0,0,.5)}
.dfm-wx-card img{display:block;width:300px;height:500px;object-fit:contain}
.dfm-wx-close{position:absolute;top:-14px;right:-14px;width:32px;height:32px;border-radius:50%;
  border:none;background:#0b1622;color:#fff;font-size:18px;cursor:pointer}
/* 页脚 */
.dfm-foot{border-top:1px solid var(--dfm-line);margin-top:40px;background:var(--dfm-surface)}
.dfm-foot-inner{max-width:1180px;margin:0 auto;padding:28px 20px;color:var(--dfm-muted);font-size:14px}
.dfm-foot-links{margin:12px 0;display:flex;flex-wrap:wrap;gap:14px}
.dfm-foot-links a{color:var(--dfm-muted)}
.dfm-foot-note{font-size:12px;color:#6c8298;margin-top:10px}
/* 响应式：平板单列；手机隐藏 TOC、分类折叠 */
@media (max-width:1024px){
  .dfm-doc{grid-template-columns:1fr}
  .dfm-toc{display:none}
  .dfm-line-grid{grid-template-columns:repeat(2,1fr)}
  .dfm-scenario{grid-template-columns:repeat(2,1fr)}
  .dfm-card-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:640px){
  body{font-size:15px}
  .dfm-burger{display:block}
  .dfm-menu{display:none;position:absolute;top:100%;left:0;right:0;
    flex-direction:column;background:var(--dfm-surface);border-bottom:1px solid var(--dfm-line);padding:10px}
  .dfm-menu.open{display:flex}
  .dfm-has-sub .dfm-drop{display:none;position:static;box-shadow:none;border:none;
    background:var(--dfm-surface2);margin:4px 0}
  .dfm-has-sub.open .dfm-drop{display:block}
  .dfm-line-grid{grid-template-columns:1fr}
  .dfm-scenario{grid-template-columns:1fr}
  .dfm-card-grid{grid-template-columns:1fr}
  .dfm-hero{padding:32px 22px}
  .dfm-hero h1{font-size:26px}
  .dfm-doc h1{font-size:24px}
  .dfm-doc h2{font-size:20px}
  h1,h2,h3,p,li,td,th{overflow-wrap:anywhere;word-break:break-word}
}