:root{
  --bg:#0a0c10;
  --fg:#e8ecf2;
  --muted:#9aa3ad;
  --card:#131720;
  --border:#2a3240;
  --accent:#00e0c2;
  --shadow:0 8px 28px rgba(0,0,0,.25);
  --radius:12px;
  --focus:2px solid var(--accent);
}
@media (prefers-color-scheme: light){
  :root{
    --bg:#f7f9fc;
    --fg:#14161a;
    --muted:#4b5563;
    --card:#ffffff;
    --border:#e5e7eb;
    --accent:#0ea5e9;
    --shadow:0 8px 24px rgba(2,6,23,.08);
  }
}
[data-theme='light']{
  --bg:#f7f9fc;
  --fg:#14161a;
  --muted:#4b5563;
  --card:#ffffff;
  --border:#e5e7eb;
  --accent:#0ea5e9;
  --shadow:0 8px 24px rgba(2,6,23,.08);
}

*{box-sizing:border-box}
html,body{height:100%;background:var(--bg);color:var(--fg);
  font:16px/1.5 system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Noto Sans,Arial,sans-serif}
a{color:var(--accent);text-decoration:none} a:hover{text-decoration:underline}

.skip-link{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden}
.skip-link:focus{left:12px;top:12px;width:auto;height:auto;padding:8px 12px;background:var(--card);
  border:1px solid var(--border);border-radius:8px;box-shadow:var(--shadow)}

.site-header{border-bottom:1px solid var(--border);background:color-mix(in oklab,var(--bg) 94%,black)}
.nav{max-width:960px;margin:0 auto;padding:14px 16px;display:flex;align-items:center;justify-content:space-between;gap:12px}
.brand{display:inline-flex;align-items:center;gap:10px;color:var(--fg)} .brand-name{font-weight:650}
.logo{display:block}
.nav-actions{display:flex;gap:10px;align-items:center}
.nav-link{padding:6px 10px;border-radius:8px}
.nav-link.active,.nav-link:hover{background:color-mix(in oklab,var(--card) 88%,transparent)}

.container{max-width:960px;margin:0 auto;padding:24px 16px}
.hero{text-align:center;padding:12px 0 22px}
.tagline{color:var(--muted)}

.grid{display:grid;gap:18px;align-items:start;grid-template-columns:minmax(280px,1fr) minmax(320px,1fr)}
@media (max-width:860px){.grid{grid-template-columns:1fr}}

.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:18px}

.field{margin-bottom:14px}
.field.two{display:grid;grid-template-columns:1fr 1fr;gap:14px}
label{display:block;font-weight:600;margin-bottom:6px}
.help{font-size:.9rem;color:var(--muted)}
.input-row{display:flex;gap:8px}

input[type="number"], select{
  width:100%;padding:8px 10px;border:1px solid var(--border);border-radius:10px;background:var(--bg);color:var(--fg)
}
input:focus,select:focus,button:focus{outline:var(--focus);outline-offset:2px}

.actions{display:flex;gap:10px;margin:10px 0 2px}
.btn{appearance:none;border:1px solid var(--border);background:color-mix(in oklab,var(--card) 90%,var(--accent) 10%);
  color:var(--fg);padding:8px 12px;border-radius:10px;cursor:pointer;transition:background-color .2s,transform .02s}
.btn:hover{background:color-mix(in oklab,var(--card) 80%,var(--accent) 20%)}
.btn:active{transform:translateY(1px)} .btn.ghost{background:transparent} .btn.small{font-size:.9rem;padding:6px 10px}

.results .stat-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
@media (max-width:720px){.results .stat-grid{grid-template-columns:1fr}}
.stat{border:1px dashed var(--border);border-radius:10px;padding:12px}
.stat-k{font-size:.9rem;color:var(--muted)} .stat-v{font-weight:700;font-size:1.1rem}
.mono{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace}
.small{font-size:.9rem}
.warnings{margin-bottom:10px;color:#f59e0b}
.card.sub{margin-top:10px}

.site-footer{border-top:1px solid var(--border);margin-top:18px}
.footer-inner{display:flex;justify-content:center;padding:18px 16px;color:var(--muted)}

.centered{display:grid;place-content:center;height:100%;padding:24px}
.prose p,.prose li{max-width:65ch}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}