/* Metronium — precision-instrument identity. Dark first, light supported. */
:root{
  --graphite:#151719; --graphite-2:#1C2023; --graphite-3:#262B2F;
  --paper:#FAFAF8; --paper-2:#EDEEEA;
  --cobalt:#1F4FD8; --cobalt-light:#5C86F0; --amber:#D98324;

  --bg:var(--graphite); --surface:var(--graphite-2); --surface-2:var(--graphite-3);
  --ink:#F1F2F0; --ink-2:#B8BEC2; --mute:#828A90; --rule:#2C3236;
  --accent:var(--cobalt-light); --accent-ink:#0B0F14; --accent-soft:#16233F;

  --display:Archivo,"Helvetica Neue",Helvetica,Arial,sans-serif;
  --body:"IBM Plex Sans","Helvetica Neue",Helvetica,Arial,sans-serif;
  --mono:"IBM Plex Mono",Menlo,"Courier New",monospace;
  --wrap:1120px;
}
@media (prefers-color-scheme: light){
  :root:not([data-theme="dark"]){
    --bg:var(--paper); --surface:#FFFFFF; --surface-2:var(--paper-2);
    --ink:#14171A; --ink-2:#3B4348; --mute:#677076; --rule:#DCDED8;
    --accent:var(--cobalt); --accent-ink:#FFFFFF; --accent-soft:#E4EAFB;
  }
}
:root[data-theme="light"]{
  --bg:var(--paper); --surface:#FFFFFF; --surface-2:var(--paper-2);
  --ink:#14171A; --ink-2:#3B4348; --mute:#677076; --rule:#DCDED8;
  --accent:var(--cobalt); --accent-ink:#FFFFFF; --accent-soft:#E4EAFB;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0; background:var(--bg); color:var(--ink);
  font-family:var(--body); font-size:16.5px; line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
.wrap{max-width:var(--wrap); margin-inline:auto; padding-inline:clamp(20px,5vw,40px)}
a{color:var(--accent)}
h1,h2,h3{font-family:var(--display); letter-spacing:-.028em; line-height:1.08; margin:0; text-wrap:balance}
h1{font-size:clamp(2.5rem,6.4vw,4.1rem); font-weight:700}
h2{font-size:clamp(1.6rem,3.6vw,2.3rem); font-weight:700}
h3{font-size:1.06rem; font-weight:600; letter-spacing:-.012em}
p{margin:14px 0 0; max-width:64ch}
.eyebrow{
  font-family:var(--mono); font-size:.7rem; font-weight:500; text-transform:uppercase;
  letter-spacing:.14em; color:var(--mute); margin:0;
}
code{font-family:var(--mono); font-size:.88em; background:var(--surface-2); padding:1.5px 6px; border-radius:3px}

/* ── nav ───────────────────────────────────────── */
header.top{
  border-bottom:1px solid var(--rule); position:sticky; top:0;
  background:var(--bg); z-index:20;
  /* Without this the nav's intrinsic width drags the whole document sideways
     on a phone. Belt and braces alongside the media query below. */
  overflow-x:clip;
}
.top .wrap{display:flex; align-items:center; gap:28px; height:62px}
.brand{display:flex; align-items:center; gap:10px; text-decoration:none; color:var(--ink); font-family:var(--display); font-weight:700; font-size:1.1rem; letter-spacing:-.03em}
.brand svg{width:26px; height:26px; display:block}
.top nav{display:flex; gap:22px; margin-left:auto; align-items:center}
.top nav a{font-size:.9rem; color:var(--ink-2); text-decoration:none}
.top nav a:hover{color:var(--accent)}
.top .tick{font-family:var(--mono); font-size:.78rem; color:var(--accent); border:1px solid var(--rule); padding:4px 9px; border-radius:3px; text-decoration:none}

/* ── hero ──────────────────────────────────────── */
.hero{padding-block:clamp(64px,10vw,110px) clamp(48px,7vw,80px); border-bottom:1px solid var(--rule)}
.hero h1{max-width:16ch}
.hero .sub{font-size:clamp(1.05rem,2.2vw,1.24rem); color:var(--ink-2); max-width:54ch; margin-top:22px}
.cta{display:flex; flex-wrap:wrap; gap:12px; margin-top:34px}
.btn{
  display:inline-flex; align-items:center; gap:8px; padding:11px 20px; border-radius:4px;
  font-family:var(--body); font-size:.94rem; font-weight:500; text-decoration:none; border:1px solid var(--rule);
  color:var(--ink); background:var(--surface);
}
.btn.primary{background:var(--accent); border-color:var(--accent); color:var(--accent-ink)}
.btn:hover{border-color:var(--accent)}

/* ── sections ──────────────────────────────────── */
section.band{padding-block:clamp(52px,7vw,82px); border-bottom:1px solid var(--rule)}
.lede{font-size:1.1rem; color:var(--ink-2); max-width:58ch; margin-top:18px}

.grid{display:grid; gap:1px; background:var(--rule); border:1px solid var(--rule); margin-top:34px}
.grid.c2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.grid.c4{grid-template-columns:repeat(auto-fit,minmax(232px,1fr))}
.grid > div{background:var(--bg); padding:24px}
.grid p{font-size:.94rem; color:var(--ink-2); margin-top:7px}
.grid .n{font-family:var(--mono); font-size:.7rem; color:var(--accent); letter-spacing:.1em; display:block; margin-bottom:9px}

pre{
  font-family:var(--mono); font-size:.82rem; line-height:1.65; background:var(--surface);
  border:1px solid var(--rule); border-radius:4px; padding:18px 20px; overflow-x:auto; margin:26px 0 0;
}
pre .c{color:var(--mute)} pre .k{color:var(--accent)} pre .s{color:var(--amber)}

table{border-collapse:collapse; width:100%; font-size:.92rem; min-width:440px}
/* Two-column tables fit a phone; only wide ones should need a sideways drag. */
.tw.fit table{min-width:0}
.tw{overflow-x:auto; margin-top:26px; border-top:1px solid var(--ink)}
th,td{text-align:left; padding:11px 16px 11px 0; border-bottom:1px solid var(--rule); vertical-align:top}
th{font-family:var(--mono); font-weight:500; font-size:.68rem; text-transform:uppercase; letter-spacing:.11em; color:var(--mute)}
td.k{font-family:var(--mono); font-size:.82rem; white-space:nowrap}
td.addr{font-family:var(--mono); font-size:.76rem; color:var(--mute); word-break:break-all; white-space:normal}

footer.site{padding-block:44px; color:var(--mute); font-size:.86rem}
footer.site .row{display:flex; flex-wrap:wrap; gap:10px 26px; align-items:center}
footer.site a{color:var(--mute); text-decoration:none}
footer.site a:hover{color:var(--accent)}
footer.site .fine{margin-top:20px; font-size:.78rem; max-width:70ch; line-height:1.6}

/* ── docs shell ────────────────────────────────── */
.docs{display:block; padding-block:44px}
@media (min-width:980px){
  .docs{display:grid; grid-template-columns:212px minmax(0,1fr); gap:56px; align-items:start}
  .docs aside{position:sticky; top:86px}
}
.docs aside ol{list-style:none; margin:10px 0 24px; padding:0; display:flex; flex-direction:column; gap:2px}
.docs aside a{display:block; padding:5px 0; font-size:.88rem; color:var(--ink-2); text-decoration:none}
.docs aside a:hover,.docs aside a[aria-current]{color:var(--accent)}
.docs article > h2{margin-top:44px}
.docs article > h3{margin-top:28px}
.docs article > p:first-of-type{font-size:1.06rem; color:var(--ink-2)}

.note{border-left:3px solid var(--accent); background:var(--surface); padding:16px 20px; margin-top:24px}
.note.warn{border-left-color:var(--amber)}
.note p{margin:0; font-size:.94rem}
/* Below the two-column breakpoint the sidebar would otherwise fill the first
   screen before a single word of the article. Content first, index after. */
@media (max-width:979px){
  .docs{display:flex; flex-direction:column}
  .docs article{order:1}
  .docs aside{
    order:2; margin-top:44px; padding-top:26px;
    border-top:1px solid var(--rule);
  }
}

/* ── phone ─────────────────────────────────────── */
@media (max-width:760px){
  /* Secondary links live in the footer and the docs sidebar; on a phone the bar
     keeps only what someone actually taps from here. */
  .top nav a.sec{display:none}
  .top .wrap{gap:14px; height:58px}
  .top nav{gap:18px}
  .brand{font-size:1.02rem}
  .hero{padding-block:clamp(44px,9vw,64px) clamp(36px,7vw,52px)}
  .cta .btn{flex:1 1 auto; justify-content:center}
  .grid > div{padding:20px}
  pre{font-size:.76rem; padding:16px}
  footer.site .row{gap:10px 18px}
}

:focus-visible{outline:2px solid var(--accent); outline-offset:3px}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

/* ── contract address strip ─────────────────────── */
.ca{
  display:flex; flex-wrap:wrap; align-items:center; gap:12px;
  margin-top:30px; padding:14px 16px;
  background:var(--surface); border:1px solid var(--rule); border-radius:4px;
}
.ca .lab{
  font-family:var(--mono); font-size:.66rem; text-transform:uppercase;
  letter-spacing:.14em; color:var(--mute);
}
.ca .val{
  font-family:var(--mono); font-size:.86rem; color:var(--ink);
  word-break:break-all; flex:1 1 200px; min-width:0;
}
.ca button{
  font-family:var(--mono); font-size:.72rem; letter-spacing:.06em;
  padding:7px 12px; border-radius:3px; cursor:pointer;
  background:var(--surface-2); color:var(--ink-2);
  border:1px solid var(--rule);
}
.ca button:hover{border-color:var(--accent); color:var(--accent)}
.ca button.ok{border-color:var(--accent); color:var(--accent)}
.soon{
  font-family:var(--mono); font-size:.58rem; letter-spacing:.12em;
  text-transform:uppercase; color:var(--amber);
  border:1px solid var(--amber); border-radius:2px;
  padding:2px 5px; margin-left:7px; vertical-align:middle;
}
@media (max-width:760px){
  .ca{gap:10px; padding:13px 14px}
  .ca .val{flex:1 1 100%}
  .ca button{flex:1 1 auto}
}