/* ===== Token ===== */
:root{
  --bg:#f2f5f8;
  --surface:#ffffff;
  --surface-2:#f7f9fc;
  --surface-3:#eef1f6;
  --border:#e2e8f0;
  --border-strong:#c9d4e0;
  --text:#1c2735;
  --text-2:#51607a;
  --text-3:#7b8aa0;
  --accent:#0e7490;
  --accent-deep:#0a5a70;
  --accent-soft:#e2f1f6;
  --link:#0b7285;
  --code-bg:#f5f7fb;
  --code-ink:#31445c;
  --code-border:#e3e9f1;
  --ok:#0f766e;  --ok-bg:#e7f4f1; --ok-ink:#0e5e58;
  --warn:#b45309; --warn-bg:#fdf4e3; --warn-ink:#8a4b0d;
  --note:#1d4ed8; --note-bg:#eef2fc; --note-ink:#1e40af;
  --danger:#b91c1c; --danger-bg:#fdecec; --danger-ink:#991b1b;
  --info:#475569; --info-bg:#f1f5f9; --info-ink:#3b4a63;
  --ga:#2563eb; --ge:#0f766e; --as:#d97706; --gc:#db2777; --tag:#7c3aed; --asc:#0e7490;
  --radius:14px;
  --shadow:0 1px 2px rgba(15,23,42,.05),0 10px 30px -18px rgba(15,23,42,.18);
  --shadow-sm:0 1px 2px rgba(15,23,42,.06);
  --topbar-h:58px;
  --sidebar-w:300px;
  --font-sans:"Noto Sans SC","PingFang SC","Microsoft YaHei","Segoe UI",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","SF Mono","Cascadia Code",Consolas,"Liberation Mono",Menlo,monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:var(--font-sans);font-size:16px;line-height:1.85;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  display:grid;grid-template-rows:var(--topbar-h) 1fr;
  grid-template-columns:var(--sidebar-w) 1fr;
  min-height:100vh;
}
::selection{background:var(--accent-soft);color:var(--accent-deep)}

/* ===== Topbar ===== */
.topbar{
  grid-column:1/-1;grid-row:1;position:sticky;top:0;z-index:40;
  display:flex;align-items:center;gap:14px;
  background:rgba(255,255,255,.92);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--border);
  padding:0 16px;height:var(--topbar-h);
}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);font-weight:900;font-size:16px;letter-spacing:.2px;white-space:nowrap}
.brand .brand-mark{
  width:30px;height:30px;border-radius:9px;flex:none;
  background:linear-gradient(135deg,#0e7490,#0f766e);
  display:grid;place-items:center;color:#fff;box-shadow:var(--shadow-sm);
}
.brand .brand-sub{font-weight:400;color:var(--text-3);font-size:12px;margin-left:2px}
.toc-home{border-bottom:1px solid var(--border);margin:2px 0 8px;padding-bottom:8px}
.site-root-nav{display:flex;align-items:center;gap:9px;padding:8px 10px;border-radius:9px;color:var(--accent);font-size:13.5px;font-weight:700;line-height:1.4;text-decoration:none}
.site-root-nav:hover{background:var(--accent-soft);color:var(--accent-deep)}
.site-foot .site-foot-meta nav{display:flex;gap:14px;flex-wrap:wrap}
.toc-home .toc-item{color:var(--accent);font-weight:700}
.toc-home .toc-item .toc-num{border-color:var(--accent);color:var(--accent)}
.toc-home .toc-item:hover{background:var(--accent-soft);color:var(--accent-deep)}
.icon-btn{
  width:44px;height:44px;border:none;background:transparent;border-radius:10px;
  display:grid;place-items:center;color:var(--text-2);cursor:pointer;flex:none;
}
.icon-btn:hover{background:var(--surface-3);color:var(--text)}
.nav-toggle{display:none}
.search-wrap{position:relative;margin-left:auto;width:min(320px,38vw)}
.search-wrap svg{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:var(--text-3);pointer-events:none}
#q{
  width:100%;height:38px;border:1px solid var(--border);border-radius:10px;
  background:var(--surface-2);padding:0 14px 0 38px;font-size:13.5px;color:var(--text);
  font-family:var(--font-sans);outline:none;transition:border-color .15s,box-shadow .15s;
}
#q::placeholder{color:var(--text-3)}
#q:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(14,116,144,.12);background:#fff}
.search-count{font-size:11px;color:var(--text-3);position:absolute;right:10px;top:50%;transform:translateY(-50%);pointer-events:none}

/* ===== Sidebar ===== */
.sidebar{
  grid-column:1;grid-row:2;position:sticky;top:var(--topbar-h);
  height:calc(100vh - var(--topbar-h));overflow-y:auto;
  background:var(--surface);border-right:1px solid var(--border);
  padding:18px 12px 40px;
}
.sidebar::-webkit-scrollbar{width:8px}
.sidebar::-webkit-scrollbar-thumb{background:var(--border-strong);border-radius:4px}
.sidebar::-webkit-scrollbar-track{background:transparent}
.toc-group{margin:0 0 8px}
.toc-group-title{
  display:flex;align-items:center;gap:8px;font-size:11.5px;font-weight:700;letter-spacing:.12em;
  color:var(--text-3);padding:14px 10px 6px;text-transform:uppercase;
}
.toc-group-title::after{content:"";flex:1;height:1px;background:var(--border)}
.toc-item{display:flex;align-items:center;gap:9px;text-decoration:none;color:var(--text-2);
  padding:8px 10px;border-radius:9px;font-size:13.5px;line-height:1.4;
  transition:background .12s,color .12s;}
.toc-item:hover{background:var(--surface-2);color:var(--text)}
.toc-item.active{background:var(--accent-soft);color:var(--accent-deep);font-weight:700}
.toc-num{
  flex:none;min-width:30px;text-align:center;font-size:11px;font-weight:700;
  color:var(--text-3);border:1px solid var(--border);border-radius:6px;padding:1px 4px;
  font-family:var(--font-mono);
}
.toc-item.active .toc-num{border-color:transparent;background:var(--accent);color:#fff}
.toc-item[data-hidden="1"]{display:none}
.toc-item .toc-label{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.toc-dot{flex:none;width:8px;height:8px;border-radius:50%;opacity:.85}
.scrim{display:none}

/* ===== Content ===== */
.content{grid-column:2;grid-row:2;min-width:0}
/* 内容宽度/内边距由 assets/site.css 的 .content-inner 统一提供 */
.view{animation:fadeIn .25s ease}
@keyframes fadeIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

/* chapter head */
.chapter-head{margin-bottom:26px;padding-bottom:22px;border-bottom:1px solid var(--border)}
.chapter-kicker{display:flex;align-items:center;gap:10px;margin-bottom:12px;flex-wrap:wrap}
.badge{
  display:inline-flex;align-items:center;gap:7px;padding:5px 12px;border-radius:999px;
  font-size:12.5px;font-weight:700;color:#fff;letter-spacing:.3px;
}
.badge svg{width:14px;height:14px}
.badge.pill-asc{background:var(--asc)} .badge.pill-ga{background:var(--ga)} .badge.pill-ge{background:var(--ge)}
.badge.pill-as{background:var(--as)} .badge.pill-gc{background:var(--gc)} .badge.pill-tag{background:var(--tag)}
.badge.pill-none{background:#64748b}
.chapter-no{font-family:var(--font-mono);font-size:12.5px;font-weight:700;color:var(--text-3);letter-spacing:.05em}
.chapter-head h1{margin:0 0 6px;font-size:30px;font-weight:900;letter-spacing:-.3px;line-height:1.3}
.chapter-head .chapter-words{color:var(--text-3);font-size:13.5px}
.toc-box{
  margin-top:18px;background:var(--surface-2);border:1px solid var(--border);border-radius:12px;padding:14px 16px;
}
.toc-box-title{font-size:12px;font-weight:700;color:var(--text-2);letter-spacing:.08em;margin-bottom:8px}
.toc-list{display:flex;flex-wrap:wrap;gap:6px}
.toc-list a{
  font-size:12.5px;color:var(--link);text-decoration:none;background:#fff;
  border:1px solid var(--border);border-radius:7px;padding:4px 10px;transition:all .12s;
}
.toc-list a:hover{border-color:var(--accent);color:var(--accent-deep)}

/* ===== Typography ===== */
.view h1{font-size:30px;font-weight:900;letter-spacing:-.3px;line-height:1.3;margin:0 0 18px}
.view h2{
  font-size:22px;font-weight:800;letter-spacing:-.1px;line-height:1.4;
  margin:42px 0 14px;padding:4px 0 4px 14px;border-left:4px solid var(--accent);border-radius:2px;
}
.view h3{font-size:17px;font-weight:800;margin:30px 0 10px;padding-left:12px;position:relative}
.view h3::before{content:"";position:absolute;left:0;top:9px;width:6px;height:6px;border-radius:50%;background:var(--accent);opacity:.75}
.view h4{font-size:15.5px;font-weight:700;margin:24px 0 8px;color:var(--text-2)}
.view p{margin:0 0 16px;color:var(--text)}
.view p, .view li{text-wrap:pretty}
.view strong{font-weight:700;color:var(--text)}
.view a{color:var(--link);text-decoration:none;border-bottom:1px solid rgba(11,114,133,.35);transition:border-color .12s}
.view a:hover{border-bottom-color:var(--link)}
.view ul,.view ol{margin:0 0 18px;padding-left:26px}
.view li{margin:5px 0}
.view li::marker{color:var(--accent)}
.view hr{border:none;border-top:1px solid var(--border);margin:34px 0}
.view del{color:var(--text-3)}

/* inline code */
.view :not(pre)>code{
  background:var(--accent-soft);color:var(--accent-deep);font-family:var(--font-mono);
  font-size:.86em;padding:2px 6px;border-radius:5px;white-space:nowrap;
}
/* code block */
.view pre{
  background:var(--code-bg);border:1px solid var(--code-border);border-radius:12px;
  padding:16px 18px;overflow-x:auto;margin:0 0 18px;line-height:1.68;
  font-family:var(--font-mono);font-size:13px;color:var(--code-ink);
  tab-size:4;position:relative;
}
.view pre code{background:transparent;padding:0;font-family:inherit;font-size:inherit;color:inherit;white-space:pre}
/* table */
.table-wrap{overflow-x:auto;margin:0 0 20px;border:1px solid var(--border);border-radius:12px;background:#fff;box-shadow:var(--shadow-sm)}
.view table{border-collapse:collapse;width:100%;min-width:560px;font-size:13.5px;line-height:1.6}
.view thead th{
  background:var(--surface-2);color:var(--text-2);font-weight:700;text-align:left;
  padding:10px 14px;border-bottom:1px solid var(--border);white-space:nowrap;font-size:12.5px;letter-spacing:.02em;
}
.view tbody td{padding:10px 14px;border-bottom:1px solid var(--border);vertical-align:top;color:var(--text)}
.view tbody tr:last-child td{border-bottom:none}
.view tbody tr:nth-child(even){background:var(--surface-2)}
.view tbody tr:hover{background:var(--accent-soft)}
.view td strong{color:var(--text)}
/* blockquote callouts */
.view blockquote{
  position:relative;margin:18px 0;padding:13px 16px 13px 18px;border-radius:11px;
  background:var(--info-bg);border-left:4px solid var(--info);
}
.view blockquote p{margin:4px 0}
.view blockquote p:first-child{margin-top:0}
.view blockquote p:last-child{margin-bottom:0}
.view blockquote>p>strong:first-child{
  display:inline-block;font-size:12px;letter-spacing:.04em;padding:2px 10px;border-radius:999px;margin-right:8px;
  background:var(--info);color:#fff;font-weight:700;
}
.view blockquote.warn{background:var(--warn-bg);border-left-color:var(--warn)}
.view blockquote.warn>p>strong:first-child{background:var(--warn)}
.view blockquote.tip{background:var(--ok-bg);border-left-color:var(--ok)}
.view blockquote.tip>p>strong:first-child{background:var(--ok)}
.view blockquote.note{background:var(--note-bg);border-left-color:var(--note)}
.view blockquote.note>p>strong:first-child{background:var(--note)}
.view blockquote.danger{background:var(--danger-bg);border-left-color:var(--danger)}
.view blockquote.danger>p>strong:first-child{background:var(--danger)}
/* nested code in blockquote */
.view blockquote :not(pre)>code{background:rgba(255,255,255,.7)}

/* ===== Hero (home) ===== */
.hero{
  border-radius:18px;padding:30px 30px 26px;margin-bottom:30px;position:relative;overflow:hidden;
  background:
    radial-gradient(900px 300px at 15% -40%, rgba(14,116,144,.16), transparent 60%),
    radial-gradient(700px 280px at 95% -30%, rgba(15,118,110,.12), transparent 60%),
    var(--surface);
  border:1px solid var(--border);box-shadow:var(--shadow);
}
.hero-eyebrow{font-size:12px;font-weight:700;letter-spacing:.18em;color:var(--accent);margin-bottom:10px}
.hero h1{font-size:30px;font-weight:900;margin:0 0 10px;letter-spacing:-.4px}
.hero p.lead{color:var(--text-2);font-size:15px;margin:0 0 22px;max-width:620px}
.arch-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.arch-card{
  display:flex;align-items:center;gap:12px;background:#fff;border:1px solid var(--border);
  border-radius:12px;padding:12px 14px;text-decoration:none;transition:all .14s;box-shadow:var(--shadow-sm);
}
.arch-card:hover{transform:translateY(-2px);box-shadow:var(--shadow);border-color:var(--border-strong)}
.arch-card .arch-ico{
  width:40px;height:40px;border-radius:10px;display:grid;place-items:center;color:#fff;flex:none;
}
.arch-card b{display:block;font-size:14px;color:var(--text);line-height:1.3}
.arch-card span{display:block;font-size:11.5px;color:var(--text-3);line-height:1.4}
.hero-foot{margin-top:22px;display:flex;gap:10px;flex-wrap:wrap}
.hero-chip{
  font-size:12.5px;color:var(--text-2);background:var(--surface-2);border:1px solid var(--border);
  border-radius:999px;padding:5px 12px;
}

/* ===== Pager ===== */
.pager{display:flex;gap:14px;margin-top:46px;padding-top:26px;border-top:1px solid var(--border)}
.pager a{
  flex:1;text-decoration:none;background:var(--surface);border:1px solid var(--border);border-radius:13px;
  padding:15px 18px;transition:all .14s;min-height:72px;display:flex;flex-direction:column;justify-content:center;
}
.pager a:hover{border-color:var(--accent);box-shadow:var(--shadow)}
.pager a.next{text-align:right;align-items:flex-end}
.pager .dir{font-size:11.5px;color:var(--text-3);letter-spacing:.08em;font-weight:700;margin-bottom:3px}
.pager .t{font-size:15px;font-weight:700;color:var(--text);line-height:1.4}
.pager a:hover .t{color:var(--accent-deep)}
.pager .spacer{flex:1;padding:15px 18px;min-height:72px}

/* ===== Totop ===== */
.totop{
  position:fixed;right:22px;bottom:24px;width:46px;height:46px;border-radius:50%;
  border:1px solid var(--border);background:#fff;color:var(--text-2);cursor:pointer;
  display:grid;place-items:center;box-shadow:var(--shadow);z-index:30;opacity:0;pointer-events:none;
  transition:opacity .2s,transform .2s;
}
.totop.show{opacity:1;pointer-events:auto}
.totop:hover{color:var(--accent-deep);transform:translateY(-2px)}

/* ===== Footer：样式见 assets/site.css 的 .site-foot ===== */

/* ===== Responsive ===== */
@media (max-width:1020px){
  .arch-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:899px){
  body{grid-template-columns:1fr}
  .topbar{grid-column:1}
  .nav-toggle{display:grid}
  .brand-sub{display:none}
  .search-wrap{width:auto;flex:1;max-width:none}
  .sidebar{
    grid-column:1;grid-row:auto;position:fixed;top:0;left:0;width:min(320px,84vw);
    height:100vh;height:100dvh;z-index:60;transform:translateX(-102%);
    transition:transform .24s ease;box-shadow:var(--shadow);border-right:1px solid var(--border);
    padding-top:calc(var(--topbar-h) + 10px);
  }
  .sidebar.open{transform:none}
  .scrim{
    display:block;position:fixed;inset:0;background:rgba(15,23,42,.38);z-index:50;
    opacity:0;pointer-events:none;transition:opacity .2s;
  }
  .scrim.show{opacity:1;pointer-events:auto}
  .content{grid-column:1}
  .content-inner{padding:24px 18px 80px}
  .chapter-head h1,.view h1,.hero h1{font-size:25px}
  .view h2{font-size:20px}
  .view pre{font-size:12.5px;padding:14px}
  .pager{flex-direction:column}
}
@media (max-width:520px){
  .arch-grid{grid-template-columns:1fr 1fr;gap:8px}
  .arch-card{padding:10px 12px;gap:10px}
  .arch-card .arch-ico{width:34px;height:34px}
  .toc-list a{font-size:12px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .view,.arch-card{animation:none;transition:none}
}