/* URBGO document platform: authoritative shell, tokens and reusable page primitives. */
:root{
  --urbgo-lime:#a6cf00;
  --urbgo-lime-bright:#c2f000;
  --urbgo-lime-deep:#86a800;
  --urbgo-ink:#1e201a;
  --urbgo-ink-soft:#3a3c34;
  --urbgo-muted:#8b8e83;
  --urbgo-line:#e7e8e2;
  --urbgo-paper:#fff;
  --urbgo-stage:#0b0c07;
  --urbgo-radius:8px;
  --urbgo-motion:cubic-bezier(.32,.72,0,1);
  --lime:var(--urbgo-lime);
  --lime-bright:var(--urbgo-lime-bright);
  --lime-deep:var(--urbgo-lime-deep);
  --ink:var(--urbgo-ink);
  --ink-soft:var(--urbgo-ink-soft);
  --gray:var(--urbgo-muted);
  --line:var(--urbgo-line);
  --paper:var(--urbgo-paper);
}

body[data-layout="reader"] .topbar{
  height:62px;
  padding:0 24px;
  background:linear-gradient(180deg,rgba(13,14,8,.88),rgba(13,14,8,.52) 72%,rgba(13,14,8,0));
  border-bottom:1px solid rgba(255,255,255,.06);
  backdrop-filter:blur(14px);
}
.topright{display:flex;align-items:center;gap:8px;min-width:0}
.docnav{display:flex;gap:2px;min-width:0;max-width:min(66vw,860px);overflow-x:auto;scrollbar-width:none;background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.10);border-radius:var(--urbgo-radius);padding:2px;margin-right:6px}
.docnav::-webkit-scrollbar{display:none}
.docnav a{font-family:var(--sc,'Jost','Noto Sans SC',sans-serif);font-size:12px;font-weight:550;letter-spacing:0;color:#8a8d80;text-decoration:none;border-radius:6px;padding:7px 12px;transition:color .24s var(--urbgo-motion),background-color .24s var(--urbgo-motion),transform .24s var(--urbgo-motion);white-space:nowrap}
.docnav a:hover{color:#fff;background:rgba(255,255,255,.05)}
.docnav a.on,.docnav a[aria-current="page"]{background:var(--urbgo-lime);color:#16170f}
.tool,.langsw,.langsw button{border-radius:var(--urbgo-radius)}
.tool:focus-visible,.langsw button:focus-visible,.docnav a:focus-visible{outline:3px solid rgba(166,207,0,.34);outline-offset:2px}
.tools .tool.on{color:var(--urbgo-lime)}

/* New fixed pages should use these primitives instead of one-off inline positioning. */
.ds-page{position:relative;width:1200px;height:1697px;overflow:hidden;background:linear-gradient(180deg,#fff,#fbfcf8);color:var(--urbgo-ink)}
.ds-media{position:absolute;inset:0;display:block;width:100%;height:100%}
.ds-media image-slot,.ds-media img{display:block;width:100%;height:100%;object-fit:cover}
.ds-scrim{position:absolute;inset:0;background:linear-gradient(180deg,rgba(8,10,6,.16),rgba(8,10,6,0) 38%,rgba(8,10,6,.22) 62%,rgba(8,10,6,.84));pointer-events:none}
.ds-brand{position:absolute;z-index:2;left:62px;right:62px;top:64px;display:flex;justify-content:space-between;align-items:baseline;border-bottom:1px solid rgba(255,255,255,.28);padding-bottom:20px;color:#fff}
.ds-brand b{font-size:42px;line-height:1}.ds-brand b span{color:var(--urbgo-lime)}
.ds-brand small{font-size:12px;font-weight:650;letter-spacing:.08em;color:rgba(255,255,255,.78)}
.ds-copy{position:absolute;z-index:2;left:62px;right:100px;bottom:210px;color:#fff}
.ds-kicker{font-size:13px;font-weight:700;letter-spacing:.16em;color:var(--urbgo-lime);margin-bottom:24px}
.ds-title{font-family:var(--sc,'Jost','Noto Sans SC',sans-serif);font-size:68px;font-weight:430;line-height:1.12;text-wrap:balance}
.ds-lead{max-width:820px;margin-top:26px;font-family:var(--sc,'Jost','Noto Sans SC',sans-serif);font-size:21px;font-weight:300;line-height:1.68;color:#eef1e8;text-wrap:pretty}
.ds-footer{position:absolute;z-index:2;left:62px;right:62px;bottom:72px;display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid rgba(255,255,255,.28);padding-top:22px;font-size:12px;font-weight:650;letter-spacing:.09em;color:rgba(255,255,255,.76)}
.ds-footer span:nth-child(2){text-align:center}.ds-footer span:last-child{text-align:right}

@media(max-width:820px){
  body[data-layout="reader"] .topbar{height:48px;padding:0 10px}
  .docnav a{padding:5px 7px;font-size:11px}
}
@media(max-width:560px){
  .topright{width:100%;min-width:0;justify-content:space-between;gap:4px}
  .docnav{max-width:none;min-width:0;margin-right:0;flex:1 1 auto}
  .langsw{margin-right:0;flex:0 0 auto}
  .tools{flex:0 0 auto}
}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;animation-duration:.01ms!important;transition-duration:.01ms!important}}
@media print{.topbar,.bottom,.hint,.toc,.nav,.spine{display:none!important}}