:root{
  --paper:#F5F7F8;--surface:#FFFFFF;--surface-2:#EEF2F3;
  --ink:#0E1926;--ink-soft:#3A4A57;--ink-faint:#65757F;
  --line:#DCE3E6;--line-soft:#E8EDEF;
  --accent:#3B4E8C;--accent-deep:#2A3A6E;--accent-bright:#5B72C4;
  --cleared:#1F8F5F;--exception:#B5730B;
  --shadow:0 1px 2px rgba(14,25,38,.05),0 8px 24px -12px rgba(14,25,38,.18);
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --paper:#0B1219;--surface:#111C25;--surface-2:#0F1A22;
    --ink:#EAF1F3;--ink-soft:#AEBEC7;--ink-faint:#7C8D97;
    --line:#22323C;--line-soft:#1A2831;
    --accent:#8A9BE0;--accent-deep:#6A7FCC;--accent-bright:#A7B6EE;
    --cleared:#4FC98A;--exception:#E0A23C;
    --shadow:0 1px 2px rgba(0,0,0,.3),0 12px 30px -14px rgba(0,0,0,.6);
  }
}
:root[data-theme="dark"]{
  --paper:#0B1219;--surface:#111C25;--surface-2:#0F1A22;
  --ink:#EAF1F3;--ink-soft:#AEBEC7;--ink-faint:#7C8D97;
  --line:#22323C;--line-soft:#1A2831;
  --accent:#2FBFA6;--accent-deep:#12A78F;--accent-bright:#54D6BF;
  --cleared:#4FC98A;--exception:#E0A23C;
  --shadow:0 1px 2px rgba(0,0,0,.3),0 12px 30px -14px rgba(0,0,0,.6);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{background:var(--paper);color:var(--ink);font-family:"IBM Plex Sans",system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.6;-webkit-font-smoothing:antialiased}
.wrap{max-width:820px;margin:0 auto;padding:0 24px}
.wrap-wide{max-width:1120px;margin:0 auto;padding:0 24px}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.mono{font-family:"IBM Plex Mono",ui-monospace,Menlo,monospace}
.eyebrow{font-family:"IBM Plex Mono",monospace;font-size:12px;font-weight:500;letter-spacing:.14em;text-transform:uppercase;color:var(--accent)}
h1,h2,h3{text-wrap:balance;letter-spacing:-.02em;line-height:1.15;font-weight:600;color:var(--ink)}

/* header */
header.bar{position:sticky;top:0;z-index:40;background:color-mix(in srgb,var(--paper) 88%,transparent);backdrop-filter:saturate(140%) blur(10px);border-bottom:1px solid var(--line-soft)}
.bar-in{max-width:1120px;margin:0 auto;padding:0 24px;height:60px;display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;align-items:center;gap:10px;font-weight:600;letter-spacing:-.02em;font-size:17px;color:var(--ink)}
.brand:hover{text-decoration:none}
.mark{width:26px;height:26px;border-radius:7px;background:linear-gradient(145deg,var(--accent),var(--accent-deep));position:relative;flex:0 0 auto}
.mark::before{content:"";position:absolute;inset:6px 6px auto 6px;height:2px;border-radius:2px;background:rgba(255,255,255,.9);box-shadow:0 5px 0 rgba(255,255,255,.55),0 10px 0 rgba(255,255,255,.35)}
nav.links{display:flex;gap:24px;align-items:center}
nav.links a{font-size:14px;color:var(--ink-soft)}
nav.links a:hover{color:var(--ink);text-decoration:none}
.btn{display:inline-flex;align-items:center;gap:8px;font-size:14px;font-weight:500;border-radius:9px;padding:10px 16px;border:1px solid transparent;cursor:pointer;transition:.15s}
.btn:hover{text-decoration:none}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-deep)}
.btn-ghost{background:transparent;border-color:var(--line);color:var(--ink)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}
@media(max-width:680px){nav.links a:not(.btn){display:none}}

/* article */
main{padding:48px 0 24px}
.crumbs{font-size:13px;color:var(--ink-faint);margin-bottom:18px}
.crumbs a{color:var(--ink-faint)}
h1.title{font-size:clamp(28px,4vw,40px);margin-top:10px}
.lede{font-size:18px;color:var(--ink-soft);margin-top:18px}
.prose{margin-top:8px}
.prose h2{font-size:22px;margin:38px 0 0}
.prose h3{font-size:17px;margin:26px 0 0}
.prose p{margin-top:14px;color:var(--ink-soft)}
.prose ul{margin:14px 0 0 22px;color:var(--ink-soft)}
.prose li{margin-top:7px}
.prose strong{color:var(--ink);font-weight:600}
.prose code{background:var(--surface-2);border:1px solid var(--line-soft);border-radius:5px;padding:1px 6px;font-size:13px;color:var(--ink)}

.cta-row{display:flex;gap:12px;margin-top:26px;flex-wrap:wrap}
.steps{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:18px}
@media(max-width:560px){.steps{grid-template-columns:1fr}}
.step{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:16px}
.step .k{font-family:"IBM Plex Mono",monospace;font-size:12px;color:var(--accent);font-weight:600}
.step h3{font-size:15px;margin:8px 0 5px}
.step p{font-size:13.5px;color:var(--ink-soft)}

.faq{margin-top:16px}
.faq details{border-bottom:1px solid var(--line-soft);padding:14px 0}
.faq summary{font-weight:600;cursor:pointer;font-size:15px;color:var(--ink);list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"+ ";color:var(--accent);font-family:"IBM Plex Mono",monospace}
.faq details[open] summary::before{content:"\2013 "}
.faq p{margin-top:10px;color:var(--ink-soft);font-size:14.5px}

.band{margin:44px 0 0;background:linear-gradient(150deg,var(--accent-deep),var(--accent));border-radius:16px;padding:34px;color:#fff}
.band h2{font-size:22px;color:#fff;margin:0}
.band p{color:rgba(255,255,255,.86);margin-top:10px;font-size:15px}
.band .btn-primary{background:#fff;color:var(--accent-deep);margin-top:18px}
.band .btn-primary:hover{background:#eafaf6}

.related{margin-top:40px;padding-top:22px;border-top:1px solid var(--line-soft)}
.related .eyebrow{margin-bottom:12px;display:block}
.related a{display:inline-block;margin:0 14px 8px 0;font-size:14px}

footer{padding:36px 0 60px;border-top:1px solid var(--line-soft);margin-top:48px;color:var(--ink-faint);font-size:13px}
.foot-in{max-width:1120px;margin:0 auto;padding:0 24px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;align-items:center}