:root{--ink:#0B1320;--ink-2:#111C2E;--line-d:#22324A;--paper:#F5F7FA;--white:#fff;--line:#DCE3EC;--text:#152033;--muted:#566378;--muted-d:#9AA8BC;--accent:#1F6FEB;--accent-h:#1858BD;--signal:#27B39B;--r:6px}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:76px}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{font-family:"IBM Plex Sans",system-ui,-apple-system,Segoe UI,sans-serif;font-size:17px;line-height:1.65;color:var(--text);background:var(--white);-webkit-font-smoothing:antialiased}
a{color:var(--accent)}a:hover{color:var(--accent-h)}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.wrap{max-width:1160px;margin:0 auto;padding:0 24px}
.narrow{max-width:760px}
h1,h2,h3{letter-spacing:-.02em;line-height:1.18;font-weight:700}
h1{font-size:clamp(32px,4.4vw,48px);margin-bottom:16px}
h2{font-size:clamp(24px,2.8vw,32px);margin:44px 0 12px}
h3{font-size:20px;margin:28px 0 8px}
p{margin:14px 0}
ul,ol{margin:14px 0 14px 22px}li{margin:6px 0}
.mono{font-family:"IBM Plex Mono",ui-monospace,monospace;font-variant-numeric:tabular-nums}
.eyebrow{font-family:"IBM Plex Mono",monospace;font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);font-weight:500}
.skip{position:absolute;left:-9999px}.skip:focus{left:16px;top:12px;background:#fff;padding:8px 12px;z-index:100}
header.site{position:sticky;top:0;z-index:50;background:rgba(11,19,32,.97);border-bottom:1px solid var(--line-d)}
header.site .wrap{display:flex;align-items:center;gap:24px;height:64px}
.brand{color:#fff;text-decoration:none;font-weight:700;font-size:18px;white-space:nowrap}
.brand span{color:var(--signal)}
nav.primary{display:flex;gap:20px;margin-left:auto}
nav.primary a{white-space:nowrap;color:#B8C4D6;text-decoration:none;font-size:15px}nav.primary a:hover{color:#fff}
.btn{display:inline-block;white-space:nowrap;font-weight:600;font-size:16px;padding:13px 20px;border-radius:4px;text-decoration:none;border:1px solid transparent}
.btn-p{background:var(--accent);color:#fff}.btn-p:hover{background:var(--accent-h);color:#fff}
.btn-o{border-color:var(--line);color:var(--text)}.btn-o:hover{background:var(--paper);color:var(--text)}
header .btn{padding:9px 16px;font-size:15px}
@media (max-width:900px){nav.primary{display:none}header .btn{margin-left:auto}}
.crumb{font-size:14px;color:var(--muted);padding:26px 0 0}
.crumb a{text-decoration:none}
article{padding:18px 0 72px}
.meta{color:var(--muted);font-size:15px;border-bottom:1px solid var(--line);padding-bottom:18px;margin-bottom:8px}
.lede{font-size:20px;color:var(--muted)}
.key{background:var(--paper);border-left:3px solid var(--accent);border-radius:0 6px 6px 0;padding:18px 20px;margin:22px 0}
.key p{margin:6px 0}
table{width:100%;border-collapse:collapse;margin:20px 0;font-size:16px}
th,td{text-align:left;padding:12px 14px;border-bottom:1px solid var(--line);vertical-align:top}
th{background:var(--paper);font-family:"IBM Plex Mono",monospace;font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);font-weight:500}
td.num{font-family:"IBM Plex Mono",monospace;white-space:nowrap}
.cta-band{background:var(--ink);color:#E8EDF4;border-radius:var(--r);padding:30px;margin:44px 0 0}
.cta-band h2{color:#fff;margin:0 0 8px;font-size:26px}
.cta-band p{color:var(--muted-d);margin:0 0 18px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:20px 0}
@media (max-width:760px){.grid2{grid-template-columns:1fr}}
.card{border:1px solid var(--line);border-radius:var(--r);padding:22px}
.card h3{margin-top:0}
.card p{color:var(--muted);font-size:16px}
footer{background:var(--ink);color:#B9C7D6;border-top:1px solid var(--line-d);padding:48px 0 36px;font-size:15px;margin-top:56px}
footer a{color:#C7D2E2;text-decoration:none}footer a:hover{color:#fff}
footer .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:36px}
footer ul{list-style:none;margin:0}footer li{margin:6px 0}
footer .legal{border-top:1px solid var(--line-d);margin-top:36px;padding-top:22px;font-size:13px;line-height:1.6}
@media (max-width:760px){footer .cols{grid-template-columns:1fr}}
@media (max-width:760px){
  .wrap{padding:0 18px}
  table{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch}
  table thead th{white-space:nowrap}
  td,th{min-width:120px}
  .cta-band{padding:24px}
  .crumb{font-size:13px}
}
@media (max-width:420px){.brand{font-size:16px}header .btn{padding:8px 12px;font-size:14px}}
@media (max-width:760px){
  header.site .wrap{gap:10px}
  header .btn{padding:8px 12px;font-size:14px}
}
@media (max-width:430px){
  header.site .wrap{padding:0 14px;gap:8px}
  .brand{font-size:15px}
  header .btn{padding:8px 10px;font-size:13.5px}
}
@media (max-width:380px){
  header .btn{padding:7px 9px;font-size:13px}
  .brand span{margin:0}
  .brand{font-size:14px}
}
@media (max-width:360px){
  header.site .wrap{height:auto;flex-wrap:wrap;padding:10px 12px;row-gap:8px}
  .brand{font-size:14px;max-width:100%}
  header .btn{margin-left:auto}
}

/* ===================== soft light theme · 2026-09-29 ===================== */
:root{--paper:#F6F8FC;--line:rgba(16,27,45,.10);--hair:rgba(16,27,45,.055);--text:#0F1A2C;--muted:#5B6879;--muted-d:#5B6879;--signal:#0E9F87;--r:16px;--glass:rgba(255,255,255,.62);--glass-2:rgba(255,255,255,.80);--blur:saturate(1.35) blur(14px);--sh-1:0 1px 2px rgba(16,27,45,.04),0 10px 30px -14px rgba(16,27,45,.13)}
html{background:#fff}
body{background:transparent;position:relative}
body::before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;background:radial-gradient(760px 540px at 6% -10%,rgba(31,111,235,.13),transparent 60%),radial-gradient(680px 480px at 97% 0%,rgba(14,159,135,.10),transparent 58%),radial-gradient(940px 640px at 50% 114%,rgba(31,111,235,.07),transparent 62%)}
h1,h2,h3{letter-spacing:-.026em}h1,h2{font-weight:600}
header.site{background:rgba(255,255,255,.72);-webkit-backdrop-filter:saturate(1.6) blur(18px);backdrop-filter:saturate(1.6) blur(18px);border-bottom:1px solid var(--hair)}
.brand{color:var(--text)}.brand span{color:var(--accent)}
nav.primary a{color:var(--muted)}nav.primary a:hover{color:var(--text)}
header .btn{white-space:nowrap}
.btn{border-radius:10px}
.btn-o,.btn-o.l{border-color:var(--line);color:var(--text);background:var(--glass-2);-webkit-backdrop-filter:var(--blur);backdrop-filter:var(--blur)}
.btn-o:hover,.btn-o.l:hover{background:#fff;color:var(--text)}
.alt{background:rgba(246,248,252,.58)}
.dark{background:transparent;color:var(--text)}
.dark h2,.dark h3,.dark b,.dark strong{color:var(--text)}
.dark p,.dark li,.dark .lede{color:var(--muted)}
.dark .eyebrow{color:var(--accent)}
.card,.box,table{background:var(--glass);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--sh-1);-webkit-backdrop-filter:var(--blur);backdrop-filter:var(--blur)}
table th{background:rgba(246,248,252,.7);color:var(--muted)}
table th,table td{border-bottom:1px solid var(--hair)}
footer{background:#0C1523;border-top:1px solid rgba(255,255,255,.08)}
footer .brand{color:#fff}footer .brand span{color:var(--signal)}