:root{--paper:#0F1626;--sheet:#162034;--ink:#EAEFF7;--ink-2:#A9B4C9;--ink-3:#8591A9;--rule:#243049;--pen:#F2B84B;--on-pen:#1E1503;--pen-text:#F5C566;color-scheme:dark}
*{box-sizing:border-box}
body{margin:0;background:var(--paper);color:var(--ink);font-family:'Readex Pro',system-ui,-apple-system,'Segoe UI',Tahoma,sans-serif;font-size:16px;line-height:1.7}
.wrap{max-width:760px;margin:0 auto;padding:0 20px 60px}
.top{display:flex;align-items:center;justify-content:space-between;padding:18px 0 26px}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;font-weight:600;font-size:18px}
.mark{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:9px;background:var(--pen);color:var(--on-pen);font-weight:700;font-size:14px;transform:rotate(-4deg);direction:ltr}
.lang{color:var(--ink);border:1px solid #34425F;border-radius:999px;padding:5px 14px;text-decoration:none;font-size:14px}
h1{font-size:clamp(28px,5vw,40px);line-height:1.1;letter-spacing:-.02em;margin:0 0 10px;font-weight:600}
h2{font-size:20px;margin:34px 0 8px;font-weight:600}
p,li{color:var(--ink-2)} strong{color:var(--ink)}
a{color:var(--pen-text);text-underline-offset:3px}
.lead{font-size:18px}
.card{background:var(--sheet);border:1px solid var(--rule);border-radius:14px;padding:16px 18px;margin:14px 0}
.math{direction:ltr;font-variant-numeric:tabular-nums;color:var(--ink);font-size:15px}
.cta{display:inline-block;margin-top:26px;background:var(--pen);color:var(--on-pen);padding:10px 18px;border-radius:10px;text-decoration:none;font-weight:500}
.foot{margin-top:46px;padding-top:16px;border-top:1px solid var(--rule);font-size:13px;color:var(--ink-3);display:flex;gap:18px;flex-wrap:wrap}
.foot a{color:var(--ink-2);text-decoration:none}
[hidden]{display:none!important}
code{font-size:.9em;background:#1C2840;padding:1px 5px;border-radius:5px;color:#EAEFF7}
.card ul{margin:6px 0 4px;padding-inline-start:20px}.card p{margin:4px 0}.muted{color:var(--ink-3);font-size:14px}