:root{
  --bg:#ffffff; --ink:#14213d; --muted:#4a5568; --line:#e2e8f0;
  --band:#f4f7fb; --accent:#0b5fa5; --accent-ink:#ffffff; --notice:#fff4d6; --notice-ink:#5a3f00;
}
@media (prefers-color-scheme:dark){
  :root{ --bg:#0f1624; --ink:#e8edf5; --muted:#a9b4c6; --line:#27324a;
    --band:#141d30; --accent:#6db3f2; --accent-ink:#0f1624; --notice:#3a2f10; --notice-ink:#ffe9a8; }
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
a{color:var(--accent)}
.wrap{max-width:1040px;margin:0 auto;padding:0 16px}

.notice{background:var(--notice);color:var(--notice-ink);padding:10px 16px;text-align:center;font-size:.92rem}
.notice a{color:inherit;font-weight:600}

.site-header{position:sticky;top:0;background:var(--bg);border-bottom:1px solid var(--line);z-index:10}
.bar{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;padding-top:12px;padding-bottom:12px}
.brand{display:flex;align-items:baseline;gap:8px;text-decoration:none;color:var(--ink);font-weight:700}
.brand small{font-weight:500;color:var(--muted);font-size:.75rem;border:1px solid var(--line);border-radius:999px;padding:1px 8px}
.mark{color:var(--accent)}
nav{display:flex;gap:16px;flex-wrap:wrap}
nav a{color:var(--ink);text-decoration:none;font-weight:500}
nav a:hover{color:var(--accent)}

.hero{padding:56px 0 48px;background:linear-gradient(180deg,var(--band),var(--bg))}
.eyebrow{margin:0 0 8px;color:var(--accent);font-weight:600;font-size:.85rem;letter-spacing:.06em;text-transform:uppercase}
h1{font-size:clamp(1.8rem,5vw,2.8rem);line-height:1.15;margin:0 0 16px;max-width:20ch}
.lead{max-width:60ch;color:var(--muted);font-size:1.1rem;margin:0 0 24px}
.cta{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-block;padding:10px 18px;border-radius:8px;border:1px solid var(--line);text-decoration:none;color:var(--ink);font-weight:600}
.btn.primary{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}

.section{padding-top:48px;padding-bottom:48px}
.band{background:var(--band)}
h2{margin:0 0 4px;font-size:1.6rem}
.sub{margin:0 0 24px;color:var(--muted)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:16px}
.card{display:block;padding:20px;border:1px solid var(--line);border-radius:12px;background:var(--bg);text-decoration:none;color:var(--ink);transition:transform .15s,border-color .15s}
.card:hover{transform:translateY(-2px);border-color:var(--accent)}
.card h3{margin:0 0 6px;font-size:1.1rem}
.card p{margin:0 0 12px;color:var(--muted);font-size:.95rem}
.card span{color:var(--accent);font-weight:600;font-size:.9rem}

.links{padding-left:20px}
.links li{margin:6px 0}

.site-footer{border-top:1px solid var(--line);padding:32px 0;color:var(--muted);font-size:.9rem}
.site-footer .small{font-size:.8rem}

@media (max-width:600px){
  .bar{flex-direction:column;align-items:flex-start}
  .hero{padding:36px 0 32px}
}

/* inner pages */
.hero.small{padding:40px 0 28px}
.hero.small h1{max-width:none}
nav a[aria-current="page"]{color:var(--accent);border-bottom:2px solid var(--accent)}
.prose{max-width:820px}
.prose h2{margin-top:32px}
.prose h2:first-child{margin-top:0}
.prose h3{margin:24px 0 4px}
.prose ul{padding-left:20px}
.prose li{margin:6px 0}
.mt{margin-top:40px}
table{width:100%;border-collapse:collapse;margin:12px 0 16px;font-size:.95rem}
th,td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top}
th{background:var(--band)}
.src{margin-top:40px;padding-top:16px;border-top:1px solid var(--line);color:var(--muted);font-size:.85rem}
.notice-box{padding:14px 16px;border-radius:10px;background:var(--notice);color:var(--notice-ink);margin-bottom:8px}
.prose .btn{margin:4px 8px 4px 0}
.prose .grid{margin-top:16px}
@media (max-width:600px){table{display:block;overflow-x:auto}}