:root{
  --paper:#fbfbf9;--ink:#0e1012;--mute:#7d8185;--faint:#a8abae;--hair:#e7e7e3;
  --pulse:#1b3cf0;--ember:#e0521a;--card:#f3f3f0;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,"SF Mono","Cascadia Mono","Segoe UI Mono",Menlo,Consolas,monospace;
}
@media (prefers-color-scheme:dark){
  :root{--paper:#0a0b0d;--ink:#f2f3f2;--mute:#767b7f;--faint:#4e5357;--hair:#1d2023;
        --pulse:#6b8cff;--ember:#ff8a4c;--card:#111316;}
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
body{background:var(--paper);color:var(--ink);font-family:var(--mono);
  font-size:16px;line-height:1.6;overflow-x:hidden;-webkit-font-smoothing:antialiased}
a{color:inherit}
.skip{position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip:focus{position:fixed;left:16px;top:16px;z-index:99;width:auto;height:auto;
  clip:auto;margin:0;background:var(--paper);color:var(--ink);padding:12px 16px;
  border:1px solid var(--hair);border-radius:4px;font-size:13px}
.bar{display:flex;align-items:center;justify-content:space-between;
  padding:18px clamp(16px,5vw,40px);max-width:1120px;margin:0 auto}
.brand{display:flex;align-items:center;gap:9px;font-size:13px;font-weight:500;
  text-decoration:none}
.bar nav{display:flex;gap:clamp(12px,3vw,22px);font-size:11px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--mute)}
.bar nav a{text-decoration:none}
.bar nav a:hover{color:var(--ink)}
.crumbs{max-width:730px;margin:0 auto;padding:8px clamp(16px,5vw,40px) 0;
  font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--faint)}
.crumbs a{text-decoration:none}
.crumbs a:hover{color:var(--ink)}
main{max-width:730px;margin:0 auto;padding:clamp(28px,6vh,52px) clamp(16px,5vw,40px)}
h1{font-family:var(--sans);font-size:clamp(25px,4.8vw,35px);font-weight:500;
  letter-spacing:-.022em;line-height:1.25;margin-bottom:10px}
h2{font-family:var(--sans);font-size:clamp(18px,3.4vw,23px);font-weight:500;
  letter-spacing:-.012em;margin:42px 0 12px}
h3{font-family:var(--sans);font-size:15px;font-weight:500;margin:26px 0 6px}
.updated{font-size:12px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--faint);margin-bottom:26px}
p{font-size:14px;line-height:1.78;margin-bottom:14px;max-width:65ch}
p.lede{font-size:15px;color:var(--mute)}
ul,ol{margin:0 0 14px 18px}
li{font-size:14px;line-height:1.78;margin-bottom:6px}
strong{font-weight:500}
main a{text-decoration-color:var(--hair);text-underline-offset:3px}
main a:hover{text-decoration-color:var(--pulse)}
.answer{background:var(--card);border-radius:10px;padding:20px 22px;margin:22px 0}
.answer p{margin:0;font-size:14px;line-height:1.75}
.answer p+p{margin-top:10px}
.note{border-left:2px solid var(--hair);padding:2px 0 2px 16px;color:var(--mute);
  font-size:13px;margin:20px 0}
table{width:100%;border-collapse:collapse;margin:20px 0;font-size:13px}
th,td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--hair)}
th{font-size:9px;letter-spacing:.16em;text-transform:uppercase;color:var(--mute);font-weight:400}
td:first-child{font-weight:500}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));
  gap:12px;margin:26px 0}
.tile{background:var(--card);border-radius:10px;padding:20px;text-decoration:none;
  display:block;transition:transform .18s ease}
.tile:hover{transform:translateY(-2px)}
.tile h2,.tile h3{font-family:var(--sans);font-size:15px;font-weight:500;margin:0 0 6px;letter-spacing:0}
.tile p{font-size:13px;color:var(--mute);margin:0}
.cta{display:inline-block;margin:26px 0 0;font-family:var(--sans);font-size:14px;
  font-weight:500;text-decoration:none;border-bottom:2px solid var(--pulse);
  padding-bottom:2px}
details{border-top:1px solid var(--hair);padding:16px 0}
details:last-of-type{border-bottom:1px solid var(--hair)}
summary{font-family:var(--sans);font-size:15px;font-weight:500;cursor:pointer;
  list-style:none;display:flex;justify-content:space-between;gap:14px;align-items:center}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";color:var(--faint);font-size:19px;font-weight:300;flex:none}
details[open] summary::after{content:"\2212"}
details p{margin-top:10px;color:var(--mute)}
footer{border-top:1px solid var(--hair);margin-top:56px}
.foot{max-width:1120px;margin:0 auto;padding:30px clamp(16px,5vw,40px);
  display:flex;flex-wrap:wrap;gap:14px 26px;align-items:center;
  justify-content:space-between;font-size:11px;color:var(--mute)}
.foot nav{display:flex;flex-wrap:wrap;gap:18px}
.foot a{text-decoration:none}
.foot a:hover{color:var(--ink);text-decoration:underline}

/* ---- touch targets: 44px minimum, per Apple + Google ---- */
.bar nav a{display:inline-flex;align-items:center;min-height:44px;padding:0 2px}
.brand{min-height:44px}
.foot nav a{display:inline-flex;align-items:center;min-height:44px}
.crumbs a{display:inline-block;padding:8px 0}
.cta{padding:10px 0 8px}
summary{min-height:44px}
details p{padding-bottom:4px}

/* ---- tables scroll rather than break the layout on narrow phones ---- */
.tw{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:20px 0}
.tw table{margin:0;min-width:440px}

@media(max-width:420px){
  .bar nav{gap:14px;font-size:10px}
  .crumbs{font-size:10px}
}