:root{--bg:#fff;--ink:#1b1f24;--muted:#57606a;--line:#e3e6ea;--accent:#0b6e4f}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.6 system-ui,-apple-system,Segoe UI,Roboto,sans-serif}
a{color:var(--accent)}.wrap{max-width:1100px;margin:0 auto;padding:0 20px}
.top{border-bottom:1px solid var(--line)}.row{display:flex;flex-wrap:wrap;gap:12px 24px;align-items:center;padding:14px 20px}
.logo{font-weight:800;font-size:20px;color:var(--ink);text-decoration:none}.top nav{display:flex;flex-wrap:wrap;gap:16px;flex:1}
.top nav a{color:var(--ink);text-decoration:none}.age{border:2px solid var(--ink);border-radius:6px;padding:1px 7px;font-weight:700;font-size:13px}
.crumbs{font-size:14px;color:var(--muted);padding-top:12px}main{padding:24px 20px 48px}
h1{font-size:clamp(28px,4vw,40px);line-height:1.15;margin:8px 0 14px}h2{margin-top:36px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px}
.card{border:1px solid var(--line);border-radius:12px;padding:18px}.card h3{margin:0 0 6px;display:flex;justify-content:space-between;gap:8px}
.bonus{font-weight:700;font-size:19px;margin:4px 0}.code strong{letter-spacing:1px}.btn{display:inline-block;background:var(--accent);color:#fff;text-decoration:none;font-weight:700;padding:10px 16px;border-radius:8px}
.muted{color:var(--muted)}.small{font-size:14px}.note{background:#f4f6f8;border-radius:8px;padding:10px 14px}
.list{padding-left:18px}.list li{margin:10px 0}.meta{color:var(--muted);font-size:15px}
.toc{background:#f4f6f8;border-radius:10px;padding:14px 18px;margin:18px 0}table{border-collapse:collapse;width:100%;display:block;overflow-x:auto}
th,td{border:1px solid var(--line);padding:8px 10px;text-align:left}details{border:1px solid var(--line);border-radius:8px;padding:10px 14px;margin:8px 0}
summary{font-weight:600;cursor:pointer}.foot{background:#1b1f24;color:#e9edf1;margin-top:40px}.foot a{color:#e9edf1}.foot .wrap{padding:28px 20px}
.foot nav{display:flex;flex-wrap:wrap;gap:16px;margin:10px 0}.foot .muted{color:#b8c0c8}