/* srf.systems — spec-paper. Light reads like a standard; dark reads like the studio. */
:root{
  --bg:#faf9f7; --bg2:#f1eef7; --ink:#211c2e; --ink2:#5a5468;
  --acc:#7c5cc4; --acc2:#5d4499; --line:#e4dff0; --code:#f3f0fa;
  --chip0:#7c5cc4; --chip1:#8d76c4; --chip2:#a9a1bd;
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#0d0817; --bg2:#1c1130; --ink:#edecea; --ink2:#b7b0c6;
    --acc:#bda4f2; --acc2:#dabca6; --line:#2c2244; --code:#1c1130;
    --chip0:#bda4f2; --chip1:#8d76c4; --chip2:#5a5468;
  }
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);
  font:16px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;}
.skip{position:absolute;left:-999px}.skip:focus{left:8px;top:8px;background:var(--acc);color:var(--bg);padding:.4rem .8rem;z-index:99}
a{color:var(--acc2)}
@media (prefers-color-scheme: dark){a{color:var(--acc)}}
a:hover{opacity:.85}
code,pre{font-family:ui-monospace,"Cascadia Mono","JetBrains Mono",Consolas,monospace;font-size:.92em}
pre{background:var(--code);border:1px solid var(--line);border-radius:8px;padding:1rem;overflow-x:auto}
code{background:var(--code);padding:.1em .35em;border-radius:4px}
pre code{background:none;padding:0}

/* top bar */
.top{position:sticky;top:0;z-index:10;display:flex;gap:1rem;align-items:center;justify-content:space-between;
  padding:.7rem 1.2rem;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line)}
.brand{text-decoration:none;color:var(--ink);white-space:nowrap;font-weight:600;letter-spacing:.02em}
.brand-srf{color:var(--acc);font-weight:800}
.brand-dot{color:var(--ink2);margin:0 .2rem}
.brand-rest{font-weight:500}
.ver{font-family:ui-monospace,monospace;font-size:.72em;border:1px solid var(--line);border-radius:99px;
  padding:.05rem .5rem;color:var(--ink2);margin-left:.4rem;vertical-align:middle}
.top nav{display:flex;gap:1.1rem;flex-wrap:wrap}
.top nav a{text-decoration:none;color:var(--ink2);font-size:.95rem}
.top nav a:hover{color:var(--acc)}
@media(max-width:700px){.brand-rest{display:none}}

main{max-width:1100px;margin:0 auto;padding:1.5rem 1.2rem 4rem}

/* hero */
.hero{padding:3.5rem 0 2rem;max-width:56rem}
.kicker{font-family:ui-monospace,monospace;font-size:.8rem;letter-spacing:.14em;text-transform:uppercase;color:var(--acc2)}
@media (prefers-color-scheme: dark){.kicker{color:var(--acc)}}
h1{font-size:clamp(1.9rem,4.5vw,3rem);line-height:1.12;letter-spacing:-.015em;margin:.4rem 0 1rem}
.acc{color:var(--acc)}
.lede{font-size:1.12rem;color:var(--ink2);max-width:48rem}
.cta-row{display:flex;gap:.8rem;flex-wrap:wrap;margin-top:1.6rem}
.btn{display:inline-block;background:var(--acc);color:var(--bg);text-decoration:none;
  padding:.6rem 1.2rem;border-radius:8px;font-weight:600}
.btn.ghost{background:none;color:var(--acc2);border:1px solid var(--line)}
@media (prefers-color-scheme: dark){.btn.ghost{color:var(--acc)}}
.three{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1rem;margin:2.2rem 0}
.three div{background:var(--bg2);border:1px solid var(--line);border-radius:10px;padding:1.1rem 1.2rem}
.three h3{margin:.1rem 0 .4rem;color:var(--acc2)}
@media (prefers-color-scheme: dark){.three h3{color:var(--acc)}}
.three p{margin:0;color:var(--ink2);font-size:.95rem}
.dois{display:flex;flex-wrap:wrap;gap:.6rem}
.dois a{font-family:ui-monospace,monospace;font-size:.8rem;text-decoration:none;border:1px solid var(--line);
  border-radius:99px;padding:.3rem .8rem}

/* docs layout */
.layout{display:grid;grid-template-columns:230px minmax(0,1fr);gap:2.2rem;align-items:start}
@media(max-width:900px){.layout{grid-template-columns:1fr}.toc{position:static;border:none;padding:0}}
.toc{position:sticky;top:4.2rem;max-height:calc(100vh - 5rem);overflow:auto;font-size:.86rem;
  border-right:1px solid var(--line);padding-right:1rem}
.toc-t{font-family:ui-monospace,monospace;text-transform:uppercase;letter-spacing:.12em;font-size:.7rem;color:var(--ink2)}
.toc ul{list-style:none;padding-left:.7rem;margin:.2rem 0}
.toc>ul{padding-left:0}
.toc a{text-decoration:none;color:var(--ink2);display:block;padding:.12rem 0}
.toc a:hover{color:var(--acc)}
.prose{max-width:76ch;min-width:0}
.prose.wide{max-width:none}
.prose h1{font-size:1.75rem;margin-top:.5rem}
.prose h2{margin-top:2.2rem;padding-top:.6rem;border-top:1px solid var(--line);font-size:1.3rem}
.prose h3{font-size:1.05rem}
.prose table{border-collapse:collapse;width:100%;display:block;overflow-x:auto;font-size:.92rem}
.prose th,.prose td{border:1px solid var(--line);padding:.45rem .7rem;text-align:left;vertical-align:top}
.prose th{background:var(--bg2)}
.prose blockquote{border-left:3px solid var(--acc);margin-left:0;padding-left:1rem;color:var(--ink2)}
hr{border:none;border-top:1px solid var(--line);margin:2rem 0}
.xref{font-family:ui-monospace,monospace;font-size:.93em;text-decoration:none;border-bottom:1px dashed var(--acc2)}

/* card chrome */
.card-head{border:1px solid var(--line);border-left:4px solid var(--acc);background:var(--bg2);
  border-radius:8px;padding:.9rem 1.1rem;margin-bottom:1.4rem}
.card-head .kicker{margin:0 0 .3rem}
.card-head .meta{margin:.2rem 0;font-size:.88rem;color:var(--ink2)}
.card-head .summary{margin:.3rem 0 0;font-size:.95rem}
.tier{font-family:ui-monospace,monospace;font-size:.68rem;letter-spacing:.06em;border-radius:99px;
  padding:.1rem .55rem;margin-left:.5rem;color:var(--bg);vertical-align:middle}
.t0{background:var(--chip0)}.t1{background:var(--chip1)}.t2{background:var(--chip2)}
.pn{display:flex;justify-content:space-between;margin-top:3rem;border-top:1px solid var(--line);padding-top:1rem}
.pn a{text-decoration:none;font-family:ui-monospace,monospace;font-size:.9rem}

/* card grid */
.cardgrid{list-style:none;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:.8rem}
.cardgrid a{display:block;text-decoration:none;color:var(--ink);border:1px solid var(--line);
  border-radius:10px;padding:.9rem 1rem;background:var(--bg2);height:100%}
.cardgrid a:hover{border-color:var(--acc)}
.cardgrid b{font-family:ui-monospace,monospace;font-size:.9rem;color:var(--acc2)}
@media (prefers-color-scheme: dark){.cardgrid b{color:var(--acc)}}
.cardgrid .tag{color:var(--ink2);font-weight:400}
.cardgrid .ct{display:block;font-weight:600;margin:.25rem 0 .15rem}
.cardgrid .cs{display:block;font-size:.85rem;color:var(--ink2)}
details{border:1px solid var(--line);border-radius:8px;padding:.6rem 1rem;margin-top:1.5rem}
summary{cursor:pointer;color:var(--acc2);font-weight:600}

footer{border-top:1px solid var(--line);margin-top:3rem;padding:1.4rem 1.2rem 2.5rem;
  font-size:.85rem;color:var(--ink2);text-align:center}
footer p{max-width:64rem;margin:.35rem auto}