/* Derive Growth Lab — the one stylesheet every page on derivegrowthlab.com links.
   Light by default, dark follows the OS. No web fonts, no CDN: the site is served
   straight off disk by Caddy and must render with nothing else reachable. */
:root{
  --bg:#f7f8fa; --panel:#ffffff; --ink:#12161f; --muted:#5a6478; --line:#e3e7ee;
  --brand:#2563eb; --brand-ink:#ffffff; --soft:#eef3ff;
  --shadow:0 1px 2px rgba(16,24,40,.06),0 8px 24px rgba(16,24,40,.06);
}
@media (prefers-color-scheme: dark){
  :root{ --bg:#0e1116; --panel:#161a22; --ink:#e9edf5; --muted:#9aa5b8; --line:#252b36;
         --brand:#5b8cff; --brand-ink:#0b0f17; --soft:#18213a;
         --shadow:0 1px 2px rgba(0,0,0,.4),0 8px 24px rgba(0,0,0,.35); }
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;overflow-x:hidden;max-width:100%}
body{background:var(--bg);color:var(--ink);
     font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
     -webkit-font-smoothing:antialiased}
a{color:var(--brand)}
.wrap{max-width:1020px;margin:0 auto;padding:0 20px}
.narrow{max-width:760px}

/* ── header ─────────────────────────────────────────────────────────────── */
header{border-bottom:1px solid var(--line);background:var(--panel);position:sticky;top:0;z-index:10}
.bar{display:flex;align-items:center;gap:14px;min-height:64px;flex-wrap:wrap;padding-top:10px;padding-bottom:10px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:17px;color:var(--ink);text-decoration:none}
.mark{width:28px;height:28px;border-radius:8px;display:block}
nav{margin-left:auto;display:flex;align-items:center;gap:16px;flex-wrap:wrap}
nav a{color:var(--muted);text-decoration:none;font-size:14.5px}
nav a:hover{color:var(--ink)}
nav a.here{color:var(--ink);font-weight:600}
nav a.cta{background:var(--brand);color:var(--brand-ink);padding:8px 14px;border-radius:8px;font-weight:600}
.btn{display:inline-block;padding:11px 18px;border-radius:9px;font-weight:600;text-decoration:none;font-size:15.5px}
.btn.primary{background:var(--brand);color:var(--brand-ink)}
.btn.ghost{border:1px solid var(--line);background:var(--panel);color:var(--ink)}
.btns{display:flex;gap:10px;flex-wrap:wrap;margin:0 0 24px}

/* ── page furniture ─────────────────────────────────────────────────────── */
.hero{padding:64px 0 40px}
.pagehead{padding:48px 0 30px}
h1{font-size:40px;line-height:1.15;margin:0 0 8px;letter-spacing:-.02em}
.pagehead h1{font-size:34px;margin-bottom:12px}
.tagline{font-size:27px;line-height:1.2;font-weight:650;margin:0 0 16px;letter-spacing:-.015em}
.lede{font-size:18.5px;color:var(--muted);max-width:680px;margin:0 0 24px}
.pills{display:flex;gap:8px;flex-wrap:wrap}
.pill{border:1px solid var(--line);background:var(--panel);border-radius:999px;padding:6px 13px;font-size:13.5px;color:var(--muted)}
section{padding:44px 0;border-top:1px solid var(--line)}
h2{font-size:25px;margin:0 0 10px;letter-spacing:-.01em;scroll-margin-top:84px}
h3{font-size:17px;margin:0 0 6px;scroll-margin-top:84px}
.sub{color:var(--muted);margin:0 0 28px;max-width:720px}
.more{margin:22px 0 0;font-weight:600}
.more a{text-decoration:none}

.step{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.35fr);gap:28px;align-items:center;margin-bottom:34px}
.step:nth-child(even) .txt{order:2}
.num{display:inline-grid;place-items:center;width:26px;height:26px;border-radius:7px;
     background:var(--soft);color:var(--brand);font-weight:700;font-size:13.5px;margin-bottom:10px}
.shot{margin:0;border:1px solid var(--line);border-radius:12px;overflow:hidden;background:var(--panel);box-shadow:var(--shadow)}
.shot img{display:block;width:100%;height:auto}
.shot figcaption{font-size:12.5px;color:var(--muted);padding:9px 12px;border-top:1px solid var(--line)}
.step p{color:var(--muted);margin:0 0 10px}
.step p:last-child{margin-bottom:0}
.step ul{color:var(--muted);margin:0 0 10px;padding-left:20px}
.step li{margin-bottom:6px}

.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px}
.card{border:1px solid var(--line);background:var(--panel);border-radius:12px;padding:18px}
.card p{margin:0 0 10px;color:var(--muted);font-size:14.5px}
.card p:last-child{margin-bottom:0}
a.card{display:block;text-decoration:none;color:inherit}
a.card:hover{border-color:var(--brand)}
a.card h3{color:var(--ink)}
.perm .card h3{font:600 13.5px/1.5 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;word-break:break-all;margin-bottom:8px}

ul.plain{margin:0;padding-left:20px;color:var(--muted)}
ul.plain li{margin-bottom:9px}
.note{border:1px solid var(--line);background:var(--panel);border-left:3px solid var(--brand);
      border-radius:10px;padding:16px 18px;color:var(--muted);font-size:15px}
.note strong{color:var(--ink)}
code{font:13.5px/1.5 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;background:var(--soft);
     color:var(--ink);padding:1px 6px;border-radius:5px}

/* ── documents (policies, help) ─────────────────────────────────────────── */
.doc{line-height:1.68;padding-bottom:10px}
.doc h1{font-size:32px;margin:38px 0 6px}
.doc h2{font-size:20px;margin:34px 0 8px}
.doc h3{font-size:16.5px;margin:22px 0 4px}
.doc .lede{font-size:16px;margin:0 0 30px}
.doc p{margin:0 0 12px}
.doc ul,.doc ol{margin:0 0 14px;padding-left:22px}
.doc li{margin-bottom:7px}
.inforce{color:var(--muted);margin:0 0 8px;font-size:14.5px}
.toc{border:1px solid var(--line);background:var(--panel);border-radius:10px;padding:14px 18px;margin:0 0 26px}
.toc ol{margin:0;padding-left:20px}
.toc li{margin-bottom:4px}
table{border-collapse:collapse;width:100%;margin:8px 0 18px;font-size:14.5px;display:block;overflow-x:auto}
th,td{text-align:left;padding:9px 11px;border-bottom:1px solid var(--line);vertical-align:top}
th{color:var(--muted);font-size:12.5px;text-transform:uppercase;letter-spacing:.04em}
.callout{background:var(--soft);border:1px solid var(--line);border-radius:10px;padding:14px 16px;margin:8px 0 20px}
.callout p:last-child{margin:0}
details.faq{border:1px solid var(--line);background:var(--panel);border-radius:10px;padding:12px 16px;margin:0 0 10px}
details.faq summary{cursor:pointer;font-weight:600}
details.faq p{margin:10px 0 0;color:var(--muted)}

/* ── footer ─────────────────────────────────────────────────────────────── */
footer{border-top:1px solid var(--line);background:var(--panel);padding:34px 0 26px;margin-top:50px}
.fcols{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:22px;margin-bottom:22px}
.fcols h4{margin:0 0 8px;font-size:12.5px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted)}
.fcols a{display:block;color:var(--ink);text-decoration:none;font-size:14.5px;margin-bottom:6px}
.fcols a:hover{color:var(--brand)}
.foot{display:flex;gap:20px;flex-wrap:wrap;align-items:center;font-size:14px;color:var(--muted);
      border-top:1px solid var(--line);padding-top:18px}
.foot a{color:var(--muted)}

@media (max-width:760px){
  h1{font-size:31px}
  .pagehead h1{font-size:28px}
  .tagline{font-size:23px}
  .step{grid-template-columns:1fr}
  .step:nth-child(even) .txt{order:0}
  .bar{padding-top:12px;padding-bottom:12px}
  nav{margin-left:0;gap:12px}
}