:root{--text:#1a1a1a;--muted:#555;--border:#e6e6e6;--soft:#fafafa}
*{box-sizing:border-box}body{margin:0;font:16px/1.7 system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;color:var(--text);background:#fff}
a{color:inherit}.topbar{height:72px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 max(20px,calc((100vw - 850px)/2))}
.brand{display:flex;align-items:center;gap:10px;font-weight:750;text-decoration:none}.brand-mark{width:30px;height:30px;border-radius:8px;background:#111;color:#fff;display:grid;place-items:center}.nav-links{display:flex;gap:18px;font-size:13px}.nav-links a{text-decoration:none;color:var(--muted)}.nav-links a:hover{text-decoration:underline}
main{max-width:850px;margin:0 auto;padding:50px 24px 70px}h1{font-size:clamp(32px,5vw,46px);line-height:1.1;letter-spacing:-1.6px;margin:0 0 12px}h2{font-size:20px;letter-spacing:-.3px;margin:30px 0 8px}p,li{color:#444} .updated{font-size:12px;color:#666;margin:0 0 28px}.notice{padding:14px 16px;background:var(--soft);border:1px solid var(--border);border-radius:10px;font-size:13px}
footer{max-width:850px;margin:auto;padding:20px 24px 28px;border-top:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;color:var(--muted);font-size:12px}.footer-links{display:flex;align-items:center;gap:16px;flex-wrap:wrap}.footer-links a{display:inline-flex;align-items:center;gap:6px;text-decoration:none}.footer-links a:hover{text-decoration:underline}.footer-links svg{width:15px;height:15px}
.error-page{min-height:calc(100vh - 150px);display:grid;place-items:center;text-align:center}.error-code{font:750 clamp(80px,18vw,150px)/1 system-ui;letter-spacing:-8px;color:#111;margin:0}.error-page h1{font-size:28px;letter-spacing:-.8px;margin:12px 0}.error-page p{max-width:440px;margin:0 auto 24px}.button{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 16px;border:1px solid #111;border-radius:7px;background:#111;color:#fff;text-decoration:none;font-size:13px;font-weight:700}
@media(max-width:520px){.topbar{height:auto;min-height:66px;padding:14px 18px;align-items:flex-start;flex-direction:column;gap:10px}.nav-links{gap:14px;flex-wrap:wrap}main{padding:38px 18px 50px}footer{padding:18px}}

.brand-mark{overflow:hidden;background:transparent;flex:none}.brand-mark img{display:block;width:100%;height:100%;object-fit:contain}