/* U — design system.
   Palette derives from a horseshoe magnet: red + pole, steel-blue - pole,
   which is also U's modifier syntax (+R / -M). Nothing here is decorative;
   the pole colors carry meaning wherever a modifier appears. */
:root{
  --ink:#12141C; --ink-2:#191C27; --ink-3:#222634;
  --paper:#FBFBFA; --paper-2:#F2F3F5;
  --pos:#D2392A; --pos-soft:rgba(226,62,46,.13);
  --neg:#3A6EC8; --neg-soft:rgba(58,110,200,.13);
  --graphite:#3D4250; --muted:#6C7281; --line:#E2E4E9; --line-dark:#2B3040;
  --mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
  --sans:"IBM Plex Sans",system-ui,-apple-system,sans-serif;
  --disp:"Space Grotesk",var(--sans);
  --wrap:1140px; --r:14px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{animation-duration:.001ms!important;transition-duration:.001ms!important}
}
body{margin:0;background:var(--paper);color:var(--graphite);
  font:400 17px/1.65 var(--sans);-webkit-font-smoothing:antialiased}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
a{color:inherit}
h1,h2,h3,h4{font-family:var(--disp);color:var(--ink);line-height:1.14;
  letter-spacing:-.02em;margin:0 0 .5em}
h1{font-size:clamp(2.6rem,6vw,4.4rem);font-weight:700;letter-spacing:-.035em}
h2{font-size:clamp(1.7rem,3.4vw,2.5rem);font-weight:600}
h3{font-size:1.2rem;font-weight:600}
p{margin:0 0 1.1em;max-width:68ch}
code,kbd{font-family:var(--mono);font-size:.92em}
:focus-visible{outline:3px solid var(--neg);outline-offset:3px;border-radius:4px}

/* ---------- nav ---------- */
.nav{position:sticky;top:0;z-index:50;background:rgba(251,251,250,.88);
  backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;gap:28px;height:66px}
.brand{display:flex;align-items:center;gap:11px;text-decoration:none;
  font-family:var(--disp);font-weight:700;font-size:1.22rem;color:var(--ink);
  letter-spacing:-.02em;margin-right:auto}
.brand img{width:27px;height:27px;display:block}
.nav a.nl{text-decoration:none;color:var(--graphite);font-size:.94rem;font-weight:500;
  padding:7px 2px;border-bottom:2px solid transparent}
.nav a.nl:hover{color:var(--ink);border-bottom-color:var(--pos)}
.nav a.nl[aria-current=page]{color:var(--ink);border-bottom-color:var(--pos)}
.nav-toggle{display:none;background:none;border:1px solid var(--line);
  border-radius:9px;padding:7px 11px;font:600 .9rem var(--sans);cursor:pointer}
@media(max-width:860px){
  .nav-toggle{display:block}
  .nav-links{display:none;position:absolute;top:66px;left:0;right:0;
    background:var(--paper);border-bottom:1px solid var(--line);
    flex-direction:column;gap:0;padding:8px 24px 18px}
  .nav-links.open{display:flex}
  .nav a.nl{padding:11px 0;border-bottom:1px solid var(--line)}
}
.nav-links{display:flex;align-items:center;gap:26px}

/* ---------- hero ---------- */
.hero{background:var(--ink);color:#E8EAEF;padding:76px 0 60px;position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(700px 340px at 12% -8%,rgba(226,62,46,.16),transparent 62%),
    radial-gradient(680px 340px at 88% 6%,rgba(58,110,200,.16),transparent 62%)}
.hero .wrap{position:relative}
.hero h1{color:#fff}
.hero .lede{font-size:clamp(1.06rem,2vw,1.28rem);color:#AEB6C6;max-width:60ch}
.eyebrow{font-family:var(--mono);font-size:.76rem;letter-spacing:.19em;
  text-transform:uppercase;color:var(--muted);margin:0 0 18px}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:52px;align-items:center}
@media(max-width:940px){.hero-grid{grid-template-columns:1fr;gap:34px}}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:9px;text-decoration:none;
  font:600 .96rem var(--sans);padding:12px 22px;border-radius:11px;
  border:1px solid transparent;cursor:pointer;transition:transform .12s,background .16s}
.btn:hover{transform:translateY(-1px)}
.btn-pos{background:var(--pos);color:#fff}
.btn-pos:hover{background:#c9331f}
.btn-ghost{border-color:rgba(255,255,255,.28);color:#E8EAEF;background:transparent}
.btn-ghost:hover{background:rgba(255,255,255,.09)}
.btn-line{border-color:var(--line);color:var(--ink);background:#fff}
.btn-line:hover{background:var(--paper-2)}
.btn-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}

/* ---------- code ---------- */
.code{background:var(--ink-2);border:1px solid var(--line-dark);border-radius:var(--r);
  overflow:hidden}
.code-bar{display:flex;align-items:center;gap:10px;padding:9px 14px;
  border-bottom:1px solid var(--line-dark);background:var(--ink-3)}
.code-bar .dot{width:9px;height:9px;border-radius:50%;background:#3A4152}
.code-bar .lbl{font-family:var(--mono);font-size:.74rem;color:var(--muted);
  letter-spacing:.09em;text-transform:uppercase;margin-left:4px}
.code pre{margin:0;padding:17px 18px;overflow:auto;font-family:var(--mono);
  font-size:.855rem;line-height:1.72;color:#CFD5E2;tab-size:2}
/* token colors — modifiers use the pole palette, everywhere, always */
.t-mod-pos{color:#FF7A66;font-weight:700}
.t-mod-neg{color:#7FA8F0;font-weight:700}
.t-kw{color:#C79BF0;font-weight:600}
.t-type{color:#6FD3C0}
.t-str{color:#E3C88A}
.t-num{color:#E3C88A}
.t-com{color:#8B93AB;font-style:italic}
.t-fn{color:#9CC2FF}

/* ---------- sections ---------- */
.sec{padding:82px 0}
.sec-tight{padding:56px 0}
.sec.alt{background:var(--paper-2);border-block:1px solid var(--line)}
.sec-head{max-width:64ch;margin-bottom:38px}
.sec-head p{color:var(--muted);font-size:1.04rem}

/* ---------- modifier strip (the signature) ---------- */
.strip{display:flex;gap:9px;flex-wrap:wrap;margin:0 0 22px;padding:0;list-style:none}
.chip{font-family:var(--mono);font-size:.9rem;font-weight:700;padding:8px 15px;
  border-radius:999px;border:1.5px solid;cursor:pointer;background:transparent;
  transition:background .15s,transform .12s;white-space:nowrap}
.chip:hover{transform:translateY(-1px)}
.chip.pos{color:var(--pos);border-color:var(--pos)}
.chip.pos:hover,.chip.pos[aria-selected=true]{background:var(--pos);color:#fff}
.chip.neg{color:var(--neg);border-color:var(--neg)}
.chip.neg:hover,.chip.neg[aria-selected=true]{background:var(--neg);color:#fff}
.strip-body{display:grid;grid-template-columns:1fr 1fr;gap:18px;align-items:start}
@media(max-width:860px){.strip-body{grid-template-columns:1fr}}
.strip-note{background:#fff;border:1px solid var(--line);border-left:3px solid var(--pos);
  border-radius:10px;padding:15px 17px;margin-bottom:18px}
.strip-note p{margin:0;font-size:.97rem}
.strip-note strong{color:var(--ink)}

/* ---------- cards ---------- */
.grid{display:grid;gap:20px}
.g3{grid-template-columns:repeat(3,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
@media(max-width:940px){.g3{grid-template-columns:1fr 1fr}}
@media(max-width:680px){.g3,.g2{grid-template-columns:1fr}}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:24px}
.card h3{margin-bottom:9px}
.card p{font-size:.96rem;color:var(--graphite);margin:0}
.card .k{font-family:var(--mono);font-size:.8rem;color:var(--pos);font-weight:700;
  display:block;margin-bottom:11px;letter-spacing:.04em}
.card.doc{display:block;text-decoration:none;transition:border-color .16s,transform .12s}
.card.doc:hover{border-color:var(--pos);transform:translateY(-2px)}
.card.doc .meta{font-family:var(--mono);font-size:.76rem;color:var(--muted);
  margin-top:12px;display:block}

/* ---------- playground ---------- */
.pg{display:grid;grid-template-columns:1fr 1fr;gap:18px;align-items:stretch}
@media(max-width:940px){.pg{grid-template-columns:1fr}}
.pg-pane{display:flex;flex-direction:column;min-height:430px}
.editor{width:100%;flex:1;min-height:380px;background:var(--ink-2);color:#CFD5E2;
  border:none;padding:17px 18px;font-family:var(--mono);font-size:.855rem;
  line-height:1.72;resize:vertical;tab-size:2;outline:none}
.pg-out{flex:1;overflow:auto;max-height:560px}
.ex-list{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:16px;padding:0;list-style:none}
.ex{font:600 .87rem var(--sans);padding:7px 14px;border-radius:9px;cursor:pointer;
  border:1px solid var(--line);background:#fff;color:var(--graphite);transition:all .15s}
.ex:hover{border-color:var(--pos);color:var(--ink)}
.ex[aria-selected=true]{background:var(--ink);border-color:var(--ink);color:#fff}
.notice{background:#fff;border:1px solid var(--line);border-left:3px solid var(--neg);
  border-radius:10px;padding:14px 17px;font-size:.93rem;margin-top:16px}
.notice strong{color:var(--ink)}
.toolbar{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-bottom:14px}
.toast{position:fixed;left:50%;bottom:28px;transform:translateX(-50%) translateY(80px);
  background:var(--ink);color:#fff;padding:12px 22px;border-radius:11px;
  font:600 .92rem var(--sans);opacity:0;transition:all .28s;pointer-events:none;z-index:90}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* ---------- snippets ---------- */
.snip{background:#fff;border:1px solid var(--line);border-radius:var(--r);
  overflow:hidden;display:flex;flex-direction:column}
.snip-h{padding:17px 20px 0}
.snip-h h3{margin-bottom:5px}
.snip-h p{font-size:.93rem;color:var(--muted);margin:0 0 13px}
.snip .code{border:none;border-radius:0;border-top:1px solid var(--line-dark)}
.snip-f{padding:12px 20px;border-top:1px solid var(--line);display:flex;gap:10px}
.mini{font:600 .82rem var(--sans);padding:6px 12px;border-radius:8px;cursor:pointer;
  border:1px solid var(--line);background:#fff;color:var(--graphite)}
.mini:hover{border-color:var(--pos);color:var(--ink)}

/* ---------- prose (learn) ---------- */
.prose{max-width:74ch}
.prose h2{margin-top:2.2em}
.prose h3{margin-top:1.7em}
.prose ul{padding-left:1.15em}
.prose li{margin-bottom:.45em}
.prose .code{margin:1.4em 0}
.prose table{width:100%;border-collapse:collapse;margin:1.4em 0;font-size:.95rem}
.prose th,.prose td{text-align:left;padding:10px 13px;border-bottom:1px solid var(--line)}
.prose th{font-family:var(--disp);color:var(--ink);font-size:.86rem;
  text-transform:uppercase;letter-spacing:.07em}
.prose td code{color:var(--ink);background:var(--paper-2);padding:2px 6px;border-radius:5px}

/* ---------- toc ---------- */
.two-col{display:grid;grid-template-columns:210px 1fr;gap:52px;align-items:start}
@media(max-width:940px){.two-col{grid-template-columns:1fr;gap:26px}}
.toc{position:sticky;top:90px}
.toc ol{list-style:none;padding:0;margin:0;counter-reset:t}
.toc a{display:block;text-decoration:none;font-size:.9rem;color:var(--muted);
  padding:6px 0 6px 13px;border-left:2px solid var(--line)}
.toc a:hover,.toc a.on{color:var(--ink);border-left-color:var(--pos)}
@media(max-width:940px){.toc{position:static}}

/* ---------- footer ---------- */
.foot{background:var(--ink);color:#9AA2B4;padding:52px 0 40px;margin-top:0}
.foot-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:34px}
@media(max-width:800px){.foot-grid{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.foot-grid{grid-template-columns:1fr}}
.foot h4{color:#fff;font-size:.82rem;text-transform:uppercase;letter-spacing:.13em;
  margin-bottom:13px;font-family:var(--mono);font-weight:500}
.foot a{display:block;color:#9AA2B4;text-decoration:none;font-size:.93rem;padding:4px 0}
.foot a:hover{color:#fff}
.foot .fine{border-top:1px solid var(--line-dark);margin-top:34px;padding-top:22px;
  font-size:.86rem;color:#6B7386;display:flex;justify-content:space-between;
  gap:14px;flex-wrap:wrap}
.foot .brand{color:#fff;margin-bottom:12px}
.status{display:inline-flex;align-items:center;gap:7px;font-family:var(--mono);
  font-size:.78rem;color:var(--muted);border:1px solid var(--line-dark);
  padding:5px 11px;border-radius:999px}
.status .d{width:7px;height:7px;border-radius:50%;background:#3FBF7F}