:root{
  --bg:#f6f7fb;--surface:#ffffff;--ink:#141830;--muted:#4a5070;--line:#dde0ee;
  --accent:#2f4bc4;--accent-ink:#ffffff;--tbc-bg:#fff2c2;--tbc-ink:#5a4300;
  --radius:18px;
}
@media (prefers-color-scheme:dark){
  :root{--bg:#0e1120;--surface:#171b30;--ink:#eceefb;--muted:#b0b6d6;--line:#2a3050;
    --accent:#8ea2ff;--accent-ink:#0e1120;--tbc-bg:#4a3a00;--tbc-ink:#ffe9a0}
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);
  font:16px/1.65 "Avenir Next","Segoe UI",system-ui,-apple-system,sans-serif}
a{color:var(--accent);text-underline-offset:3px}
a:focus-visible,.skip:focus-visible{outline:3px solid var(--accent);outline-offset:3px;border-radius:4px}
.skip{position:absolute;left:16px;top:-100px;background:var(--accent);color:var(--accent-ink);
  padding:8px 14px;border-radius:8px;z-index:10}
.skip:focus{top:12px}
.wrap{max-width:860px;margin:0 auto;padding:0 20px}
header.site{border-bottom:1px solid var(--line)}
header.site .wrap{display:flex;flex-wrap:wrap;gap:8px 24px;align-items:center;justify-content:space-between;padding-top:14px;padding-bottom:14px}
.brand{display:flex;align-items:center;gap:10px;font-weight:650;letter-spacing:.04em;color:var(--ink);text-decoration:none}
.brand-mark{width:40px;height:40px;flex:none;border-radius:10px;background:#fff;border:1px solid var(--line)}
nav ul{display:flex;gap:20px;list-style:none;margin:0;padding:0;flex-wrap:wrap}
nav a{color:var(--muted);text-decoration:none;padding:6px 0;display:inline-block}
nav a:hover,nav a[aria-current="page"]{color:var(--ink);text-decoration:underline}
main{padding:48px 0 64px}
h1{font:600 clamp(2rem,6vw,3rem)/1.15 Georgia,"Times New Roman",serif;margin:0 0 16px;letter-spacing:-.01em}
h2{font-size:1.25rem;line-height:1.3;margin:40px 0 10px}
h3{font-size:1.05rem;margin:24px 0 6px}
p,li{max-width:68ch}
.lede{font-size:1.2rem;color:var(--muted);max-width:60ch}
.notice{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px 20px;margin:28px 0}
.grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));margin:24px 0}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px}
.card h3{margin-top:0}
.card p{margin:0;color:var(--muted)}
table{border-collapse:collapse;width:100%;margin:12px 0;background:var(--surface);border-radius:12px;overflow:hidden}
th,td{text-align:left;vertical-align:top;padding:10px 14px;border-bottom:1px solid var(--line)}
th{font-size:.85rem;text-transform:uppercase;letter-spacing:.05em;color:var(--muted)}
.table-scroll{overflow-x:auto}
.meta{color:var(--muted);font-size:.95rem}
mark.tbc{background:var(--tbc-bg);color:var(--tbc-ink);padding:1px 6px;border-radius:6px}
footer.site{border-top:1px solid var(--line);padding:28px 0 40px;color:var(--muted);font-size:.95rem}
footer.site ul{list-style:none;display:flex;gap:20px;flex-wrap:wrap;margin:0 0 12px;padding:0}
@media (max-width:520px){main{padding-top:32px}th,td{padding:8px 10px}}

.hero{display:flex;gap:28px;align-items:center;margin-bottom:8px}
.hero-logo{width:140px;height:140px;flex:none;border-radius:var(--radius);background:#fff;border:1px solid var(--line)}
.hero h1{margin-top:0}
@media (max-width:600px){.hero{flex-direction:column;align-items:flex-start;gap:16px}.hero-logo{width:112px;height:112px}}
@media (max-width:600px){table.stack thead{display:none}table.stack tr,table.stack th,table.stack td{display:block}table.stack th[scope=row]{border-bottom:0;padding-bottom:0}}