*{box-sizing:border-box}body{margin:0;font:17px/1.55 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:#1b1f24;background:#f6f8fb}
main,header,footer{max-width:820px;margin:auto;padding:0 18px}.draftbar{background:#ffe08a;margin:0;padding:6px;text-align:center;font-size:14px}
.hero{padding:40px 18px 24px}.hero h1{font-size:clamp(1.6rem,4.5vw,2.4rem);line-height:1.2;margin:0 0 12px}
.btn{display:inline-block;background:#1e5bd8;color:#fff;padding:12px 18px;border-radius:8px;text-decoration:none;font-weight:600;margin:4px 6px 4px 0}.btn.ghost{background:#fff;color:#1e5bd8;border:2px solid #1e5bd8}
section{margin:28px 0}.drill{background:#fff;border:1px solid #dde3ec;border-radius:10px;padding:16px;margin:16px 0}
.drill h3{margin-top:0}figure{margin:0 0 8px}figure svg{width:100%;max-width:300px;height:auto;background:#fdfcf4;border:1px solid #e5e2cc;border-radius:6px}
.opts{list-style:none;padding:0;margin:0}.opt{width:100%;text-align:left;font:inherit;padding:10px;margin:4px 0;border:1px solid #c9d2df;border-radius:8px;background:#fff;cursor:pointer}
.opt.correct{background:#dff5e3;border-color:#2e9e4f}.opt.wrong{background:#fde2e2;border-color:#d33}
.reveal{margin-top:8px;font:inherit;background:none;border:0;color:#1e5bd8;text-decoration:underline;cursor:pointer}
.expl{background:#f2f6ff;border-left:4px solid #1e5bd8;padding:8px 12px;margin-top:10px}.src{font-size:14px;color:#555}
.signup{display:flex;flex-wrap:wrap;gap:8px;align-items:center}.signup input{flex:1 1 220px;padding:10px;font:inherit}.signup button{padding:10px 16px;font:inherit}.signup small{width:100%;color:#666}
details{background:#fff;border:1px solid #dde3ec;border-radius:8px;padding:10px 14px;margin:8px 0}summary{font-weight:600;cursor:pointer}
footer{font-size:14px;color:#444;padding-bottom:40px}