:root{
  --bg:#F5F7FA;
  --surface:#FFFFFF;
  --ink:#0F1B2D;
  --ink-soft:#5A6B82;
  --line:#CBD5E1;
  --line-soft:#E3E9F2;
  --primary:#1565FF;
  --primary-deep:#0B47C2;
  --teal:#00B4D8;
  --amber:#FF8A3D;
  --radius:14px;
  --shadow:0 8px 28px rgba(15,27,45,.08);
  --h2-inset:16px;
  --header-h:64px;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"Segoe UI","Microsoft YaHei",-apple-system,system-ui,sans-serif;
  background:var(--bg);
  color:var(--ink);
  line-height:1.75;
  font-size:16px;
}
a{color:var(--primary);text-decoration:none;}
a:hover{color:var(--primary-deep);}
img{max-width:100%;}

/* ---------- Header ---------- */
.mld-header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(8px);
  border-bottom:1px solid var(--line-soft);
}
.mld-header-inner{
  max-width:1200px;margin:0 auto;height:var(--header-h);
  display:flex;align-items:center;gap:18px;padding:0 20px;
}
.mld-brand{
  font-weight:800;font-size:20px;color:var(--ink);
  letter-spacing:.3px;white-space:nowrap;
}
.mld-brand:hover{color:var(--primary);}
.mld-nav{display:flex;align-items:center;gap:6px;margin-left:auto;}
.mld-nav>a,.mld-nav-item>summary{
  padding:8px 14px;border-radius:10px;color:var(--ink);
  font-weight:600;cursor:pointer;list-style:none;user-select:none;
}
.mld-nav>a:hover,.mld-nav-item>summary:hover{background:var(--line-soft);color:var(--primary);}
.mld-nav-item{position:relative;}
.mld-nav-item>summary::-webkit-details-marker{display:none;}
.mld-nav-sub{
  position:absolute;top:calc(100% + 8px);left:0;min-width:160px;
  background:var(--surface);border:1px solid var(--line-soft);
  border-radius:12px;box-shadow:var(--shadow);padding:8px;display:none;
}
.mld-nav-item[open]>.mld-nav-sub{display:block;}
.mld-nav-sub a{display:block;padding:8px 12px;border-radius:8px;font-weight:500;}
.mld-nav-sub a:hover{background:var(--bg);}
.mld-nav-toggle{display:none;}
.mld-nav-burger{display:none;}

/* ---------- Container / Breadcrumb ---------- */
.mld-container{max-width:1200px;margin:0 auto;padding:24px 20px 56px;}
.mld-breadcrumb{
  font-size:14px;color:var(--ink-soft);margin:8px 0 22px;
  padding-left:0;display:flex;flex-wrap:wrap;gap:6px;align-items:center;
}
.mld-breadcrumb a{color:var(--ink-soft);}
.mld-breadcrumb a:hover{color:var(--primary);}
.mld-breadcrumb span.sep{color:var(--line);}
.mld-breadcrumb span.cur{color:var(--ink);font-weight:600;}

/* ---------- Layout grids ---------- */
.mld-layout{
  display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:40px;align-items:start;
}
.mld-list-layout{
  display:grid;grid-template-columns:240px minmax(0,1fr);gap:36px;align:start;
}
.mld-content-main{min-width:0;}
.mld-content-main h1{
  font-size:30px;line-height:1.3;margin:0 0 18px;color:var(--ink);
  border-left:5px solid var(--primary);padding-left:14px;
}
.mld-content-main h2{
  font-size:22px;margin:34px 0 12px;color:var(--ink);
  padding-bottom:8px;border-bottom:2px solid var(--line-soft);
}
.mld-content-main h2 .mld-anchor{color:var(--line);font-weight:400;margin-left:8px;}
.mld-content-main h3{font-size:18px;margin:24px 0 10px;color:var(--primary-deep);}
.mld-content-main p{margin:0 0 16px;}
.mld-content-main ul,.mld-content-main ol{margin:0 0 16px;padding-left:22px;}
.mld-content-main li{margin:6px 0;}
.mld-content-main strong{color:var(--ink);}

/* blockquote / conclusion */
.mld-content-main blockquote{
  margin:18px 0;padding:14px 18px;background:#EAF2FF;
  border-left:4px solid var(--primary);border-radius:10px;color:#143A73;
}
.mld-content-main blockquote p{margin:4px 0;}

/* tables */
.mld-content-main table,.mld-page-main table,table.mld-spec{
  border-collapse:collapse;width:100%;margin:18px 0;font-size:15px;
  background:var(--surface);border:1px solid var(--line);
}
.mld-content-main table th,.mld-content-main table td,
.mld-page-main table th,.mld-page-main table td,
table.mld-spec th,table.mld-spec td{
  border:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top;
}
.mld-content-main table th,.mld-content-main table thead td,
.mld-page-main table th,table.mld-spec th{
  background:var(--primary);color:#fff;font-weight:700;
}
.mld-content-main table tbody tr:nth-child(even),
.mld-page-main table tbody tr:nth-child(even),
table.mld-spec tbody tr:nth-child(even){background:#F3F7FE;}

/* time */
.mld-content-main time{display:inline-block;color:var(--ink-soft);font-size:14px;margin:6px 0 14px;}

/* summary block (文章摘要) */
.mld-summary{
  background:var(--surface);border:1px solid var(--line-soft);border-radius:12px;
  padding:16px 18px;margin:0 0 22px;box-shadow:var(--shadow);color:#21314a;
}
.mld-keywords{font-size:14px;color:var(--ink-soft);margin:0 0 18px;}
.mld-keywords b{color:var(--primary);}

/* FAQ bare details */
.mld-faq{margin:26px 0;}
.mld-faq h2{font-size:22px;margin:0 0 14px;}
.mld-content-main details.faq-item,.faq-item{
  border:1px solid var(--line-soft);border-radius:12px;background:var(--surface);
  margin:10px 0;padding:0 16px;
}
.mld-content-main details.faq-item summary,.faq-item>summary{
  cursor:pointer;font-weight:700;padding:14px 0;list-style:none;color:var(--ink);
}
.mld-content-main details.faq-item summary::-webkit-details-marker{display:none;}
.mld-content-main details.faq-item[open] summary,.faq-item[open]>summary{color:var(--primary);}
.faq-item .faq-a{padding:0 0 14px;color:#21314a;}
.faq-item .faq-a p{margin:6px 0;}

/* related */
.mld-related{margin:26px 0;padding:16px 18px;background:#EAF7FB;border-left:4px solid var(--teal);border-radius:10px;}
.mld-related h2{margin:0 0 10px;font-size:20px;border:0;padding:0;}
.mld-related ul{margin:0;padding-left:20px;}
.mld-related li{margin:6px 0;}

/* TOC aside */
.mld-toc-aside{position:sticky;top:calc(var(--header-h) + 16px);max-height:calc(100vh - 100px);overflow-y:auto;}
.mld-toc-panel{background:var(--surface);border:1px solid var(--line-soft);border-radius:12px;padding:12px 14px;box-shadow:var(--shadow);}
.mld-toc-panel>summary{font-weight:700;cursor:pointer;list-style:none;color:var(--ink);}
.mld-toc-panel>summary::-webkit-details-marker{display:none;}
.mld-toc-panel ol{margin:10px 0 0;padding-left:18px;counter-reset:toc;}
.mld-toc-panel ol li{margin:7px 0;font-size:14px;color:var(--ink-soft);}
.mld-toc-panel ol li a{color:var(--ink-soft);}
.mld-toc-panel ol li a:hover{color:var(--primary);}

/* cat side */
.mld-cat-side{position:sticky;top:calc(var(--header-h) + 16px);}
.mld-cat-panel{background:var(--surface);border:1px solid var(--line-soft);border-radius:12px;padding:12px 14px;box-shadow:var(--shadow);}
.mld-cat-panel>summary{font-weight:700;cursor:pointer;list-style:none;color:var(--ink);}
.mld-cat-panel>summary::-webkit-details-marker{display:none;}
.mld-cat-list{list-style:none;margin:10px 0 0;padding:0;}
.mld-cat-list li{margin:4px 0;}
.mld-cat-list a{display:block;padding:8px 12px;border-radius:8px;color:var(--ink);font-weight:500;}
.mld-cat-list a:hover,.mld-cat-list a.active{background:var(--primary);color:#fff;}

/* list content cards */
.mld-list-head{margin:0 0 18px;}
.mld-list-head h1{font-size:28px;margin:0 0 8px;}
.mld-list-head p{color:var(--ink-soft);margin:0;}
.mld-card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:18px;}
.mld-card{
  background:var(--surface);border:1px solid var(--line-soft);border-radius:14px;
  padding:18px;box-shadow:var(--shadow);transition:transform .15s,box-shadow .15s;
  display:flex;flex-direction:column;gap:10px;
}
.mld-card:hover{transform:translateY(-3px);box-shadow:0 12px 30px rgba(15,27,45,.14);}
.mld-card h3{margin:0;font-size:18px;}
.mld-card h3 a{color:var(--ink);}
.mld-card .mld-card-meta{font-size:13px;color:var(--ink-soft);}
.mld-card p{margin:0;color:var(--ink-soft);font-size:14px;}
.mld-card .mld-cat-tag{display:inline-block;font-size:12px;color:var(--primary);background:#EAF2FF;padding:3px 10px;border-radius:20px;}

/* page main (leaf pages) */
.mld-page-main{max-width:840px;margin:0 auto;}
.mld-page-main h1{font-size:30px;margin:0 0 18px;border-left:5px solid var(--primary);padding-left:14px;}
.mld-page-main h2{font-size:22px;margin:30px 0 12px;border-bottom:2px solid var(--line-soft);padding-bottom:6px;}
.mld-page-main h3{font-size:18px;margin:22px 0 8px;color:var(--primary-deep);}
.mld-page-main p{margin:0 0 16px;}
.mld-page-main ul,.mld-page-main ol{margin:0 0 16px;padding-left:22px;}

/* home */
.mld-hero{
  background:linear-gradient(120deg,#0F1B2D 0%,#13376E 55%,#1565FF 100%);
  color:#fff;border-radius:20px;padding:48px 40px;margin:8px 0 36px;box-shadow:var(--shadow);
}
.mld-hero h1{font-size:36px;margin:0 0 14px;color:#fff;border:0;padding:0;}
.mld-hero p{font-size:17px;color:#CFE0FF;max-width:760px;}
.mld-hero .mld-hero-cta{margin-top:22px;display:flex;gap:14px;flex-wrap:wrap;}
.mld-hero .mld-btn{display:inline-block;padding:12px 22px;border-radius:30px;font-weight:700;}
.mld-hero .mld-btn.primary{background:#fff;color:var(--primary-deep);}
.mld-hero .mld-btn.ghost{background:rgba(255,255,255,.12);color:#fff;border:1px solid rgba(255,255,255,.4);}
.mld-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin:0 0 36px;}
.mld-stat{background:var(--surface);border:1px solid var(--line-soft);border-radius:14px;padding:20px;text-align:center;box-shadow:var(--shadow);}
.mld-stat b{display:block;font-size:28px;color:var(--primary);}
.mld-stat span{color:var(--ink-soft);font-size:14px;}
.mld-section-title{font-size:24px;margin:0 0 18px;color:var(--ink);}
.mld-pill-row{display:flex;gap:10px;flex-wrap:wrap;margin:0 0 36px;}
.mld-pill{background:#EAF2FF;color:var(--primary-deep);border-radius:30px;padding:8px 16px;font-size:14px;font-weight:600;}

/* footer */
.mld-footer{background:var(--ink);color:#C9D6EA;margin-top:40px;}
.mld-footer-inner{max-width:1200px;margin:0 auto;padding:36px 20px;}
.mld-footer-cols{display:grid;grid-template-columns:2.2fr 1fr 1fr;gap:24px;}
.mld-footer-col h3{color:#fff;font-size:15px;margin:0 0 12px;}
.mld-footer-col a{display:block;color:#9FB4D2;padding:4px 0;font-size:14px;}
.mld-footer-col a:hover{color:#fff;}
.mld-footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:24px;padding-top:16px;font-size:13px;color:#8FA6C6;}

/* float capsule */
.mld-float{position:fixed;right:18px;top:50%;transform:translateY(-50%);z-index:60;display:flex;flex-direction:column;gap:10px;}
.mld-float-btn{
  display:flex;align-items:center;gap:6px;background:linear-gradient(135deg,var(--primary),var(--teal));
  color:#fff;border:0;border-radius:30px;padding:10px 14px;font-weight:700;cursor:pointer;
  box-shadow:0 6px 18px rgba(21,101,255,.35);font-size:14px;
}
.mld-float-btn:hover{filter:brightness(1.06);}
.mld-card-overlay{position:fixed;inset:0;background:rgba(15,27,45,.6);z-index:80;display:flex;align-items:center;justify-content:center;}
.mld-card-overlay[hidden]{display:none;}
.mld-card-box{background:#fff;border-radius:14px;padding:16px;text-align:center;max-width:92vw;}
.mld-card-box img{width:300px;height:auto;max-height:80vh;border-radius:8px;}
.mld-card-close{margin-top:12px;background:var(--ink);color:#fff;border:0;border-radius:8px;padding:8px 18px;cursor:pointer;}

/* responsive */
@media (max-width:1024px){
  .mld-layout{grid-template-columns:1fr;}
  .mld-toc-aside{position:static;max-height:none;order:2;margin-top:20px;}
  .mld-list-layout{grid-template-columns:1fr;}
  .mld-cat-side{position:static;margin-bottom:20px;}
  .mld-stats{grid-template-columns:repeat(2,1fr);}
  .mld-footer-cols{grid-template-columns:1fr;}
  .mld-nav-burger{display:flex;flex-direction:column;gap:5px;margin-left:auto;cursor:pointer;padding:8px;}
  .mld-nav-burger span{width:24px;height:3px;background:var(--ink);border-radius:2px;display:block;}
  .mld-nav{display:none;position:absolute;top:var(--header-h);left:0;right:0;background:#fff;border-bottom:1px solid var(--line-soft);flex-direction:column;padding:10px 16px;gap:2px;}
  .mld-nav-toggle:checked ~ .mld-nav{display:flex;}
  .mld-nav-item{position:static;}
  .mld-nav-sub{position:static;box-shadow:none;border:0;padding:0 0 0 12px;display:block;}
  .mld-nav-item>summary{padding:10px 0;}
}
@media (max-width:600px){
  .mld-hero{padding:32px 22px;}
  .mld-hero h1{font-size:26px;}
  .mld-stats{grid-template-columns:1fr 1fr;}
  .mld-container{padding:18px 14px 40px;}
}