:root{--bg:#090b10;--surface:#11151d;--surface2:#171c26;--text:#f4f7fb;--muted:#9ba6b6;--line:#252c38;--accent:#74f2ce;--accent2:#72a7ff;--danger:#ff7a90;--max:1160px;--radius:18px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.65}a{color:inherit;text-decoration:none}button,input,select{font:inherit}.container{width:min(calc(100% - 40px),var(--max));margin:auto}.narrow{max-width:860px}.site-header{position:sticky;top:0;z-index:20;background:rgba(9,11,16,.88);backdrop-filter:blur(18px);border-bottom:1px solid rgba(255,255,255,.06)}.nav-wrap{height:72px;display:flex;align-items:center;justify-content:space-between}.brand{font-size:25px;font-weight:850;letter-spacing:-1.2px}.brand-zero{color:var(--accent)}.nav{display:flex;gap:26px;color:var(--muted);font-size:14px;font-weight:650}.nav 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.test-error{margin:16px auto 0;max-width:680px;padding:12px 14px;border:1px solid rgba(255,122,144,.35);background:rgba(255,122,144,.08);color:#ffc2cc;border-radius:12px;font-size:13px;text-align:left}