:root{color-scheme:light;--ink:#173d31;--muted:#5f746d;--brand:#1f6b52;--line:#dce7e2;--bg:#f4f8f6;--danger:#a12626}*{box-sizing:border-box}body{margin:0;background:linear-gradient(145deg,#edf7f2,#f9fbfa);font:16px/1.5 system-ui,sans-serif;color:var(--ink)}main{width:min(92%,480px);margin:8vh auto;background:white;border:1px solid var(--line);border-radius:18px;padding:32px;box-shadow:0 18px 50px #173d3118}h1{margin:0 0 8px;font-size:28px}p{color:var(--muted)}label{display:block;margin:16px 0 6px;font-weight:650}input,select,button{width:100%;font:inherit;border-radius:10px;padding:12px;border:1px solid #b8cbc3}button{margin-top:18px;background:var(--brand);color:white;border:0;font-weight:750;cursor:pointer}.secondary{background:white;color:var(--brand);border:1px solid var(--brand)}nav{display:flex;gap:14px;margin-top:20px;flex-wrap:wrap}a{color:var(--brand)}#message{min-height:24px;margin-top:14px;color:var(--danger)}.mark{font-weight:850;letter-spacing:.03em;margin-bottom:24px}.hidden{display:none}.session{padding:12px;border:1px solid var(--line);border-radius:10px;margin:8px 0}