:root{--c-primary:#1ab49c;--c-primary-d:#149c87;--bg:#fff;--bg-soft:#f7f8f9;--bg-code:#1f2430;--fg:#24292f;--fg-dim:#6b7280;--bd:#e5e7eb;--sidebar-w:290px;--toc-w:220px;--topbar-h:56px}
@media (prefers-color-scheme:dark){:root{--bg:#16181d;--bg-soft:#1d2026;--fg:#e6e6e6;--fg-dim:#9aa0a6;--bd:#2c3038}}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Segoe UI",Roboto,sans-serif;color:var(--fg);background:var(--bg);font-size:15px;line-height:1.75}
a{color:var(--c-primary-d);text-decoration:none}
a:hover{text-decoration:underline}
code,kbd,pre{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace}
code{background:var(--bg-soft);border:1px solid var(--bd);border-radius:4px;padding:.1em .35em;font-size:.88em}
pre code{background:none;border:0;padding:0;font-size:13px}
h1,h2,h3,h4{line-height:1.35;margin:1.6em 0 .6em}
h1{font-size:1.9em;margin-top:0}
h2{font-size:1.4em;border-bottom:1px solid var(--bd);padding-bottom:.3em}
h3{font-size:1.15em}
hr{border:0;border-top:1px solid var(--bd);margin:2em 0}
blockquote{margin:1em 0;padding:.6em 1em;border-left:4px solid var(--c-primary);background:var(--bg-soft);color:var(--fg-dim);border-radius:0 6px 6px 0}
img{max-width:100%}

/* topbar */
.topbar{position:sticky;top:0;z-index:40;height:var(--topbar-h);display:flex;align-items:center;gap:14px;padding:0 18px;background:var(--c-primary);color:#fff;box-shadow:0 1px 4px rgba(0,0,0,.12)}
.brand{color:#fff;font-size:15px;font-weight:600;white-space:nowrap}
.brand span{opacity:.85;font-weight:400}
.topnav{display:flex;gap:4px;margin-left:8px}
.topnav a{color:#fff;padding:6px 10px;border-radius:6px;font-size:14px;opacity:.92}
.topnav a:hover{background:rgba(255,255,255,.16);text-decoration:none;opacity:1}
.topnav a.on{background:rgba(255,255,255,.24);opacity:1}
.search-btn{margin-left:auto;display:flex;align-items:center;gap:8px;background:rgba(255,255,255,.18);border:1px solid rgba(255,255,255,.35);color:#fff;padding:6px 12px;border-radius:8px;cursor:pointer;font-size:13px}
.search-btn:hover{background:rgba(255,255,255,.3)}
.search-btn kbd{background:rgba(0,0,0,.18);border:0;color:#fff;font-size:11px;padding:1px 5px;border-radius:4px}
.icon-btn{background:rgba(255,255,255,.18);border:0;color:#fff;font-size:18px;width:34px;height:34px;border-radius:8px;cursor:pointer}
.only-mobile{display:none}

/* layout */
.layout{display:flex;align-items:flex-start;max-width:1600px;margin:0 auto}
.sidebar{position:sticky;top:var(--topbar-h);flex:0 0 var(--sidebar-w);width:var(--sidebar-w);height:calc(100vh - var(--topbar-h));overflow-y:auto;padding:14px 8px 40px;border-right:1px solid var(--bd);background:var(--bg-soft)}
.sb-title{font-size:12px;font-weight:700;letter-spacing:1px;color:var(--fg-dim);padding:6px 10px 10px;text-transform:uppercase}
.sidebar a{display:block;padding:5px 10px 5px calc(12px + var(--ind,0) * 13px);color:var(--fg);border-radius:6px;font-size:13.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sidebar a:hover{background:rgba(26,180,156,.12);text-decoration:none}
.sidebar a.on{background:var(--c-primary);color:#fff;font-weight:600}
.sb-group>summary{cursor:pointer;padding:5px 10px 5px calc(12px + var(--ind,0) * 13px);font-size:13.5px;font-weight:600;border-radius:6px;list-style:none;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sb-group>summary::-webkit-details-marker{display:none}
.sb-group>summary::before{content:"▸";display:inline-block;width:12px;transition:transform .15s;color:var(--fg-dim)}
.sb-group[open]>summary::before{transform:rotate(90deg)}
.sb-group>summary:hover{background:rgba(26,180,156,.12)}
.sb-kids{border-left:1px dashed var(--bd);margin-left:16px}
.content{flex:1 1 auto;min-width:0;padding:26px 34px 80px;max-width:980px}
.toc{position:sticky;top:var(--topbar-h);flex:0 0 var(--toc-w);width:var(--toc-w);max-height:calc(100vh - var(--topbar-h));overflow-y:auto;padding:26px 14px 40px;font-size:13px}
.toc-title{font-size:12px;font-weight:700;color:var(--fg-dim);letter-spacing:1px;margin-bottom:8px}
.toc a{display:block;color:var(--fg-dim);padding:3px 0}
.toc a:hover{color:var(--c-primary-d);text-decoration:none}
.toc a.lv3{padding-left:14px}

/* doc */
.crumb{font-size:12.5px;color:var(--fg-dim);margin-bottom:14px}
.crumb i{font-style:normal;opacity:.5;margin:0 2px}
.crumb .c-dim{opacity:.75}
.table-wrap{overflow-x:auto;margin:1em 0}
table{border-collapse:collapse;width:100%;font-size:13.5px}
th,td{border:1px solid var(--bd);padding:7px 10px;text-align:left;vertical-align:top}
th{background:var(--bg-soft);font-weight:600}
tbody tr:nth-child(even){background:rgba(127,127,127,.04)}
.code-block{position:relative;margin:1em 0;border-radius:8px;overflow:hidden;border:1px solid var(--bd)}
.cb-head{display:flex;justify-content:space-between;align-items:center;background:#2b3140;color:#9aa4b2;padding:4px 12px;font-size:11.5px;letter-spacing:.5px}
.cb-copy{background:rgba(255,255,255,.1);border:0;color:#cbd5e1;font-size:11.5px;padding:2px 9px;border-radius:4px;cursor:pointer}
.cb-copy:hover{background:rgba(255,255,255,.22)}
.code-block pre{margin:0;background:var(--bg-code);color:#e6edf3;padding:13px 14px;overflow-x:auto}
.tok-key{color:#79c0ff}.tok-str{color:#a5d6ff}.tok-num{color:#f0b47a}.tok-kw{color:#ff7b72}
.tok-com{color:#8b949e;font-style:italic}.tok-cmd{color:#7ee787}.tok-flag{color:#d2a8ff}
.tok-method{color:#ffa657;font-weight:700}.tok-header{color:#79c0ff}.tok-status{color:#7ee787}
.pager{display:flex;justify-content:space-between;gap:16px;margin-top:44px;padding-top:18px;border-top:1px solid var(--bd)}
.pager a{display:flex;flex-direction:column;padding:9px 14px;border:1px solid var(--bd);border-radius:8px;min-width:160px}
.pager a:hover{border-color:var(--c-primary);text-decoration:none}
.pager a span{font-size:11.5px;color:var(--fg-dim)}
.pg-next{text-align:right;margin-left:auto}

/* home */
.hero{padding:34px 0 8px}
.hero h1{font-size:2.2em;margin:0 0 .2em}
.hero h1 span{color:var(--c-primary)}
.hero-sub{color:var(--fg-dim);font-size:15.5px;margin:.2em 0 1.2em}
.hero-actions{display:flex;gap:10px;flex-wrap:wrap}
.btn{display:inline-block;padding:9px 18px;border:1px solid var(--bd);border-radius:8px;font-size:14px;color:var(--fg)}
.btn:hover{border-color:var(--c-primary);text-decoration:none}
.btn.primary{background:var(--c-primary);border-color:var(--c-primary);color:#fff}
.btn.primary:hover{background:var(--c-primary-d)}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:14px;margin:22px 0}
.card{display:block;padding:16px;border:1px solid var(--bd);border-radius:10px;color:var(--fg)}
.card:hover{border-color:var(--c-primary);text-decoration:none;box-shadow:0 2px 10px rgba(26,180,156,.12)}
.card b{display:block;font-size:15.5px;color:var(--c-primary-d);margin-bottom:4px}
.card span{font-size:13px;color:var(--fg-dim);display:block;line-height:1.6}
.card em{font-size:12px;color:var(--fg-dim);font-style:normal;margin-top:8px;display:block}
.note{font-size:13px;color:var(--fg-dim);background:var(--bg-soft);border:1px solid var(--bd);border-radius:8px;padding:10px 14px}

/* search */
.overlay{position:fixed;inset:0;background:rgba(0,0,0,.42);opacity:0;pointer-events:none;transition:opacity .16s;z-index:50}
.search-modal{position:fixed;inset:0;z-index:60;display:flex;align-items:flex-start;justify-content:center;padding-top:9vh}
.search-modal[hidden]{display:none}
.sm-box{width:min(720px,92vw);background:var(--bg);border:1px solid var(--bd);border-radius:12px;box-shadow:0 12px 44px rgba(0,0,0,.3);overflow:hidden}
#sm-input{width:100%;border:0;border-bottom:1px solid var(--bd);padding:15px 18px;font-size:15px;background:transparent;color:var(--fg);outline:none}
.sm-results{max-height:56vh;overflow-y:auto;padding:6px}
.sm-item{display:block;padding:9px 13px;border-radius:8px;color:var(--fg)}
.sm-item:hover,.sm-item.sel{background:rgba(26,180,156,.13);text-decoration:none}
.sm-item b{display:block;font-size:14px;font-weight:600}
.sm-item .sm-sec{font-size:11.5px;color:var(--fg-dim)}
.sm-item .sm-ex{font-size:12.5px;color:var(--fg-dim);margin-top:3px;display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.sm-item mark{background:rgba(255,213,79,.5);color:inherit;border-radius:2px}
.sm-empty{padding:18px;color:var(--fg-dim);text-align:center;font-size:13.5px}
.sm-foot{display:flex;gap:16px;padding:7px 14px;border-top:1px solid var(--bd);font-size:11.5px;color:var(--fg-dim);background:var(--bg-soft)}

.no-sidebar .sidebar{display:none}
.toc-empty{display:none}
@media (max-width:1180px){.toc{display:none}}
@media (max-width:900px){
  .only-mobile{display:inline-flex;align-items:center;justify-content:center}
  .only-desktop{display:none}
  .layout{display:block}
  .sidebar{position:fixed;top:var(--topbar-h);left:0;bottom:0;height:auto;width:86vw;max-width:330px;z-index:55;transform:translateX(-102%);transition:transform .2s;border-right:1px solid var(--bd)}
  body.nav-open .sidebar{transform:none}
  body.nav-open .overlay{opacity:1;pointer-events:auto}
  .content{padding:18px 16px 60px;max-width:none}
  .search-btn span,.search-btn kbd{display:none}
  .brand{font-size:13.5px}
  .hero h1{font-size:1.7em}
}