:root{
  --bg:#f7f3ea; --paper:#fffdf8; --ink:#263238; --muted:#66777a;
  --sky:#cfe5e6; --sky-strong:#8fbfc3; --sky-deep:#4e7d82;
  --apricot:#efd8c2; --rose:#ead7d5; --line:#dfe6e2; --code:#eef4f1;
  --shadow:0 10px 32px rgba(69,84,79,.06);
  --radius:18px; --max:1180px;
}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:92px}
body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;line-height:1.55;letter-spacing:.01em}
body:not(.site-unlocked)>*:not(#password-gate){display:none!important}
a{color:var(--sky-deep);text-decoration:none}a:hover{text-decoration:underline}
.topbar{position:sticky;top:0;z-index:50;background:rgba(247,243,234,.94);backdrop-filter:blur(14px);border-bottom:1px solid rgba(91,112,106,.12)}
.nav{max-width:var(--max);margin:auto;height:58px;display:flex;align-items:center;gap:8px;padding:0 20px}.brand{font-weight:750;margin-right:auto;color:var(--ink)}
.nav a{padding:6px 8px;border-radius:999px;color:#536466;font-size:13px;white-space:nowrap}.nav a.active{background:var(--sky);color:#315d61;text-decoration:none}.nav .subtle{opacity:.74}
.hero{max-width:var(--max);margin:0 auto;padding:48px 20px 24px}.eyebrow{font-size:12px;font-weight:700;color:var(--sky-deep);letter-spacing:.08em;text-transform:uppercase}.hero h1{font-size:clamp(30px,4.5vw,48px);line-height:1.1;margin:8px 0 12px;letter-spacing:-.035em}.hero p{max-width:760px;color:var(--muted);font-size:16px;margin:0}.hero .flow{margin-top:18px;padding:12px 16px;border:1px solid var(--line);border-radius:14px;background:rgba(255,253,248,.55);font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;overflow:auto}
.best-practice-prompt{margin:0 0 10px!important;font-size:14px!important;color:#536466!important}.export-controls{margin:0 0 10px}.export-markdown{border:1px solid #cbdcda;border-radius:999px;padding:6px 11px;background:rgba(255,253,248,.72);color:#557a7e;font:inherit;font-size:13px;cursor:pointer}.export-markdown:hover{background:var(--sky)}
.plg-definition{padding-top:34px}.plg-definition h1{font-size:clamp(30px,4vw,42px)}.plg-definition blockquote{max-width:820px;margin:10px 0;padding:8px 14px;border-left:3px solid var(--sky-strong);background:#f3f8f5;border-radius:0 10px 10px 0;color:#405356}.article .flow{margin:14px 0;padding:10px 14px;border:1px solid var(--line);border-radius:12px;background:#fafcf9;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;overflow:auto}.overview-chapters{padding-top:0}
.page-shell{max-width:var(--max);margin:0 auto;padding:10px 20px 56px;display:grid;grid-template-columns:220px minmax(0,1fr);gap:24px}.toc{position:sticky;top:74px;align-self:start;max-height:calc(100vh - 92px);overflow:auto;padding:12px 8px;border-left:2px solid var(--sky)}.toc strong{display:block;margin:0 6px 8px;font-size:12px;color:var(--muted)}.toc a{display:block;padding:4px 6px;border-radius:8px;color:#607174;font-size:12px;line-height:1.3}.toc a.l2{padding-left:14px}.toc a.l3{padding-left:24px;font-size:11px}.toc a:hover{background:#eef4f1;text-decoration:none}
.article{min-width:0;background:var(--paper);border:1px solid rgba(94,114,108,.12);border-radius:18px;padding:clamp(20px,3.5vw,42px);box-shadow:var(--shadow)}
.article h1,.article h2,.article h3,.article h4{scroll-margin-top:74px;line-height:1.22;letter-spacing:-.015em;color:#263537}.article h1{font-size:30px;margin:0 0 18px}.article h2{font-size:22px;margin:28px 0 10px;padding-top:8px;border-top:1px solid var(--line)}.article h3{font-size:17px;margin:20px 0 8px}.article h4{font-size:14px;margin:16px 0 6px}.article h1>span,.article h2>span,.article h3>span{vertical-align:middle}.deep-link{display:inline-block;margin-left:8px;padding:2px 7px;border:1px solid #cbdcda;border-radius:999px;font-size:10px;font-weight:600;vertical-align:middle;color:#557a7e;background:#f3f8f6}.deep-link:hover{text-decoration:none;background:var(--sky)}
.collapsible-section{margin:8px 0;border-top:1px solid var(--line)}.collapsible-section summary{cursor:pointer;list-style:none}.collapsible-section summary::-webkit-details-marker{display:none}.collapsible-section summary h1,.collapsible-section summary h2,.collapsible-section summary h3,.collapsible-section summary h4{display:flex;align-items:center;gap:8px}.collapsible-section summary h1:after,.collapsible-section summary h2:after,.collapsible-section summary h3:after,.collapsible-section summary h4:after{content:'⌄';margin-left:auto;color:var(--sky-deep);font-size:.8em;transition:transform .15s}.collapsible-section:not([open]) summary h1:after,.collapsible-section:not([open]) summary h2:after,.collapsible-section:not([open]) summary h3:after,.collapsible-section:not([open]) summary h4:after{transform:rotate(-90deg)}
.article p{margin:8px 0;color:#38474a}.article strong{color:#203538}.article blockquote{margin:14px 0;padding:8px 14px;border-left:3px solid var(--sky-strong);background:#f3f8f5;border-radius:0 10px 10px 0;color:#405356}.article ul,.article ol{padding-left:1.25em}.article li{margin:2px 0}.article hr{border:0;border-top:1px solid var(--line);margin:24px 0}.article pre{overflow:auto;background:var(--code);border:1px solid #d8e5df;border-radius:10px;padding:10px 12px;line-height:1.4}.article code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.86em}.article :not(pre)>code{background:#eef3ef;border-radius:5px;padding:1px 4px}.article table{width:100%;border-collapse:collapse;margin:14px 0;font-size:13px}.article th,.article td{padding:7px 9px;border:1px solid #dde5e1;text-align:left;vertical-align:top}.article th{background:#f1f5f2}.anchor-alias{position:relative;top:-72px}
.section-switch{max-width:var(--max);margin:12px auto 0;padding:0 20px;display:flex;gap:8px}.section-switch a{font-size:13px;border:1px solid #d9e2de;border-radius:999px;padding:6px 10px;background:rgba(255,253,248,.6);color:#5c6e70}.section-switch a.active{background:var(--sky);border-color:var(--sky);color:#315d61}.section-switch a:hover{text-decoration:none}
.integrity{margin-top:36px;padding:12px 14px;border-radius:12px;background:#faf7f0;border:1px dashed #ded8cb;color:#76807e;font-size:12px}.source-raw{display:none}
.overview{max-width:var(--max);margin:0 auto;padding:8px 20px 56px}.overview-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:16px}.overview-card{background:var(--paper);border:1px solid rgba(92,113,107,.12);border-radius:16px;padding:18px;min-height:150px}.overview-card h2{margin:0 0 6px;font-size:19px}.overview-card p{color:var(--muted);margin:0 0 9px}.overview-card .go{font-weight:650}.model-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:18px 0}.model-strip div{padding:12px 10px;background:#f2f7f4;border:1px solid #dce7e2;border-radius:11px;text-align:center;font-weight:650}.model-strip div:nth-child(2){background:#eef6f6}.model-strip div:nth-child(3){background:#faf2ea}.model-strip div:nth-child(4){background:#f7efef}
.footer{max-width:var(--max);margin:0 auto;padding:0 20px 28px;color:#81908e;font-size:11px}.gate-card{width:min(420px,calc(100vw - 32px));margin:18vh auto 0;background:var(--paper);border:1px solid rgba(94,114,108,.16);border-radius:18px;padding:28px;box-shadow:var(--shadow)}.gate-card h1{font-size:27px;margin:8px 0}.gate-card p{color:var(--muted);font-size:14px}.gate-card form{display:flex;gap:8px;flex-wrap:wrap}.gate-card input{flex:1 1 220px;border:1px solid #cbdad5;border-radius:9px;padding:9px 11px;font:inherit}.gate-card button{border:0;border-radius:9px;padding:9px 16px;background:var(--sky-deep);color:white;font:inherit;cursor:pointer}.gate-error{flex-basis:100%;min-height:18px;color:#a35d55;font-size:12px}
@media(max-width:900px){.nav{overflow-x:auto}.brand{display:none}.page-shell{grid-template-columns:1fr}.toc{position:relative;top:0;max-height:none;border-left:0;border-bottom:1px solid var(--line);display:flex;gap:4px;overflow-x:auto;padding:6px 0 10px}.toc strong{display:none}.toc a{white-space:nowrap;border:1px solid #dfe7e3;background:#f8fbf9}.toc a.l2,.toc a.l3{padding-left:8px}.article{border-radius:16px;padding:22px 17px}.hero{padding-top:34px}.overview-grid{grid-template-columns:1fr}.model-strip{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.nav{padding:0 12px}.hero,.page-shell,.overview,.section-switch,.footer{padding-left:14px;padding-right:14px}.hero h1{font-size:32px}.article h1{font-size:27px}.article h2{font-size:20px}.model-strip{grid-template-columns:1fr}.article table{display:block;overflow:auto}}
.overview-engine{margin:14px 0;padding:16px 18px;background:var(--paper);border:1px solid rgba(92,113,107,.12);border-radius:16px;box-shadow:var(--shadow)}.overview-engine summary{cursor:pointer;list-style:none}.overview-engine summary::-webkit-details-marker{display:none}.overview-engine summary h2{margin:0 0 8px;font-size:22px;line-height:1.22}.overview-engine summary h2:after{content:'⌄';float:right;color:var(--sky-deep);font-size:.8em}.overview-engine:not([open]) summary h2:after{transform:rotate(-90deg)}.overview-engine h3{font-size:17px;margin:20px 0 8px}.overview-engine p{margin:8px 0;color:#38474a}.overview-engine ul{padding-left:1.25em}.overview-engine li{margin:2px 0}.definition-note{color:var(--muted)!important;font-size:14px!important;margin-top:-4px!important}