:root{color-scheme:light;--navy:#15345b;--blue:#315f9f;--bg:#f5f7fa;--line:#dce3eb;--text:#1d2c40;--muted:#627186;--green:#0f6f59;--amber:#9b6816}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Noto Sans KR","Apple SD Gothic Neo",sans-serif;line-height:1.5}
.topbar{height:84px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:14px;padding:0 max(24px,calc((100vw - 920px)/2))}
.brand-mark{width:42px;height:42px;border-radius:10px;background:var(--navy);color:#fff;display:grid;place-items:center;font-family:Georgia,serif;font-size:30px;font-weight:700}
.brand-name{display:grid;gap:1px}.brand-name strong{font-size:16px;color:var(--navy)}.brand-name span{font-size:12px;color:var(--muted)}
main{max-width:640px;margin:0 auto;padding:56px 20px 64px}.page-heading{margin-bottom:28px}.eyebrow{color:var(--blue);font-size:13px;font-weight:700;letter-spacing:.05em;margin:0 0 7px}h1{font-size:31px;line-height:1.25;letter-spacing:-.04em;margin:0 0 16px}h2{font-size:19px;letter-spacing:-.02em;margin:0 0 5px}.status{display:inline-block;margin:0;padding:7px 11px;border-radius:6px;background:#eef2f7;color:var(--muted);font-size:13px;font-weight:700}.status.ready{background:#e7f4ef;color:var(--green)}.status.pending{background:#fdf3dd;color:var(--amber)}
.card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:32px;box-shadow:0 8px 30px rgba(21,52,91,.05)}.subtext{color:var(--muted);font-size:14px;margin:0 0 28px}form{display:grid}label{font-size:13px;font-weight:700;margin:0 0 8px}input{width:100%;height:48px;border:1px solid #cbd6e2;border-radius:8px;padding:0 14px;color:var(--text);font-size:16px;background:#fff;margin:0 0 23px}input:focus{outline:3px solid #d6e4fa;border-color:var(--blue)}input:disabled{background:#f2f4f7}.challenge{min-height:70px;margin:0 0 19px}button{height:48px;border:0;border-radius:8px;background:var(--navy);color:#fff;font-size:15px;font-weight:700;cursor:pointer}button:disabled{opacity:.46;cursor:not-allowed}.result{margin-top:24px;border-radius:10px;padding:18px 20px;background:#eef3fa;border-left:4px solid var(--blue)}.result.win{background:#eaf6f0;border-color:var(--green)}.result strong{display:block;font-size:18px}.result span{display:block;font-size:13px;color:var(--muted);margin-top:4px}.notice,.reference{color:var(--muted);font-size:12px;line-height:1.65;margin:22px 3px 0}.reference{word-break:break-all}footer{border-top:1px solid var(--line);color:#8591a0;font-size:12px;text-align:center;padding:22px}
@media(max-width:600px){.topbar{height:72px;padding:0 18px}main{padding:38px 16px 50px}h1{font-size:26px}.card{padding:24px 20px}}