:root{
  --ground:#F4F6F8;
  --surface:#FFFFFF;
  --sunk:#EBEFF3;
  --ink:#10151B;
  --muted:#556270;
  --faint:#8893A0;
  --rule:#D9DFE6;
  --accent:#0078D6;
  --accent-ink:#FFFFFF;
  --mark-bg:rgba(0,149,255,.14);
  --code-bg:#0F1216;
  --code-ink:#E9EDF1;
  --code-rule:#262C35;

  --f-display:'Barlow Condensed','Arial Narrow',sans-serif;
  --f-body:'Barlow','Helvetica Neue',Arial,sans-serif;
  --f-mono:'JetBrains Mono',ui-monospace,Menlo,Consolas,monospace;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root{
    --ground:#0F1216;
    --surface:#161A21;
    --sunk:#1C2129;
    --ink:#EEF1F4;
    --muted:#9AA4B1;
    --faint:#66707C;
    --rule:#2A3039;
    --accent:#2FA4FF;
    --accent-ink:#06121D;
    --mark-bg:rgba(47,164,255,.18);
    --code-bg:#0A0C10;
    --code-ink:#E9EDF1;
    --code-rule:#232830;
    color-scheme:dark;
  }
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:24px}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--ground);color:var(--ink);font:400 17px/1.6 var(--f-body);-webkit-font-smoothing:antialiased}
h1,h2,h3,p,ul,ol{margin:0}
a{color:var(--accent)}
:focus-visible{outline:3px solid var(--accent);outline-offset:3px;border-radius:2px}
.wrap{max-width:1160px;margin:0 auto;padding:0 28px}
.skip{position:absolute;left:-999px;top:8px;background:var(--accent);color:var(--accent-ink);padding:8px 12px;z-index:10}
.skip:focus{left:8px}

/* hero */
.hero{border-bottom:1px solid var(--rule);padding:64px 0 48px}
.eyebrow{font:600 13px/1 var(--f-body);letter-spacing:.16em;text-transform:uppercase;color:var(--accent)}
.hero h1{font:700 clamp(52px,8vw,96px)/.92 var(--f-display);letter-spacing:-.01em;margin:18px 0 28px}
.hero h1 span{color:var(--accent)}
.intro{display:grid;gap:14px;max-width:68ch;color:var(--muted)}
.intro strong{color:var(--ink)}
.checks{list-style:none;padding:0;display:flex;flex-wrap:wrap;gap:8px}
.checks li{background:var(--surface);border:1px solid var(--rule);border-radius:3px;padding:6px 12px;font-size:15px;color:var(--ink)}

/* layout */
.layout{display:grid;grid-template-columns:230px minmax(0,1fr);gap:56px;padding-top:40px;padding-bottom:40px}
.toc{position:sticky;top:24px;align-self:start}
.toc-title{font:600 12px/1 var(--f-body);letter-spacing:.14em;text-transform:uppercase;color:var(--faint);margin-bottom:12px}
.toc ol{list-style:none;padding:0;display:grid;gap:2px;border-left:1px solid var(--rule)}
.toc a{display:grid;grid-template-columns:22px 1fr;gap:4px;padding:6px 10px 6px 14px;margin-left:-1px;border-left:2px solid transparent;color:var(--muted);text-decoration:none;font-size:14.5px;line-height:1.35}
.toc a span{font:600 14px/1.35 var(--f-display);color:var(--faint)}
.toc a:hover{color:var(--ink)}
.toc a.on{color:var(--ink);border-left-color:var(--accent)}
.toc a.on span{color:var(--accent)}

/* sections */
.section{padding:8px 0 48px}
.section + .section{border-top:1px solid var(--rule);padding-top:44px}
.section-head{display:flex;align-items:baseline;gap:16px;margin-bottom:18px}
.section-num{font:700 44px/1 var(--f-display);color:var(--accent);min-width:28px}
.section h2{font:700 clamp(30px,3.6vw,40px)/1.05 var(--f-display);text-wrap:balance}
.section-body{display:grid;grid-template-columns:minmax(0,1fr);gap:18px}
.section-body > p{max-width:68ch;color:var(--muted)}
.section-body > p strong{color:var(--ink)}

.item{display:grid;grid-template-columns:minmax(0,1fr);gap:12px;padding-top:14px}
.item h3{font:600 22px/1.25 var(--f-body);display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 10px}
.item h3 .code{font:600 14px/1 var(--f-mono);color:var(--accent);background:var(--mark-bg);padding:5px 7px;border-radius:3px}
.needs{font:500 13px/1 var(--f-body);color:var(--muted);border:1px solid var(--rule);border-radius:3px;padding:5px 8px}
.item > p{max-width:68ch;color:var(--muted)}

/* prompt card */
.prompt{background:var(--code-bg);border:1px solid var(--code-rule);border-radius:6px;overflow:hidden}
.prompt-bar{display:flex;justify-content:space-between;align-items:center;padding:8px 8px 8px 16px;border-bottom:1px solid var(--code-rule)}
.prompt-label{font:500 12px/1 var(--f-mono);color:#7F8A96;letter-spacing:.04em}
.copy{font:600 14px/1 var(--f-body);color:#06121D;background:#2FA4FF;border:0;border-radius:4px;padding:9px 16px;cursor:pointer;min-width:84px}
.copy:hover{background:#5BB8FF}
.copy.done{background:#3DD68C}
.prompt pre{margin:0;padding:18px 18px 20px;overflow-x:auto;white-space:pre-wrap;overflow-wrap:anywhere;font:400 14.5px/1.65 var(--f-mono);color:var(--code-ink)}
.prompt mark{background:rgba(47,164,255,.2);color:#8CCBFF;border-radius:2px;padding:0 2px}

/* connect */
.connect{margin-top:12px;border-top:3px solid var(--ink);padding-top:40px;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:48px;align-items:center}
.connect-text{display:grid;gap:14px;max-width:52ch;min-width:0}
.connect h2{font:700 clamp(34px,4vw,48px)/1 var(--f-display)}
.connect p{color:var(--muted)}
.button{justify-self:start;display:inline-block;background:var(--accent);color:var(--accent-ink);text-decoration:none;font:600 16px/1 var(--f-body);padding:14px 22px;border-radius:4px;margin-top:6px}
.button:hover{filter:brightness(1.08)}
.url{font:400 14px/1.4 var(--f-mono);color:var(--faint)!important}
.qr{display:grid;gap:10px;justify-items:center;background:#FFFFFF;padding:18px;border-radius:6px;border:1px solid var(--rule)}
.qr svg{width:200px;height:200px;display:block}
.qr span{font:600 12px/1 var(--f-body);letter-spacing:.12em;text-transform:uppercase;color:#10151B}

/* footer + toast */
.foot{border-top:1px solid var(--rule);padding:22px 0;color:var(--faint);font-size:14px}
.foot .wrap{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
.toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%,20px);opacity:0;background:var(--ink);color:var(--ground);padding:12px 18px;border-radius:6px;font-weight:600;font-size:15px;transition:opacity .2s,transform .2s;pointer-events:none}
.toast.show{opacity:1;transform:translate(-50%,0)}
@media (prefers-reduced-motion:reduce){.toast{transition:none}}

@media (max-width:900px){
  .layout{grid-template-columns:minmax(0,1fr);gap:24px}
  .toc{position:static;border-bottom:1px solid var(--rule);padding-bottom:18px}
  .toc ol{grid-template-columns:repeat(2,minmax(0,1fr));border-left:0}
  .toc a{border-left:0;padding-left:0}
  .connect{grid-template-columns:minmax(0,1fr)}
  .qr{justify-self:start}
  .wrap{padding:0 18px}
  .prompt pre{font-size:13.5px}
  .hero{padding:44px 0 36px}
}