:root{--paper:#f7f6f2;--card:#fff;--ink:#26312e;--body:#48544f;--muted:#75817b;--line:#ddd9cf;--brand:#0e7c7b;--brand-deep:#0a5d5c;--brand-soft:#e6efeb;--error-bg:#fbecec;--error-edge:#b3432f}@media (prefers-color-scheme:dark){:root{--paper:#151a18;--card:#1e2523;--ink:#eaede9;--body:#b9c2bc;--muted:#8a948e;--line:#313a36;--brand:#56bdb4;--brand-deep:#7fd1ca;--brand-soft:#1c2624;--error-bg:#33201c;--error-edge:#e08a76}}*{box-sizing:border-box}body{background:var(--paper);color:var(--body);margin:0;font-family:Segoe UI,system-ui,-apple-system,sans-serif;font-size:16.5px;line-height:1.6}h1,h2,h3{color:var(--ink);line-height:1.25}a{color:var(--brand-deep)}button{font:inherit;cursor:pointer;background:var(--brand);color:#fff;border:none;border-radius:8px;padding:10px 22px;font-weight:600}button:disabled{opacity:.55;cursor:default}input[type=email],textarea{font:inherit;color:var(--ink);background:var(--card);border:1.5px solid var(--line);border-radius:8px;width:100%;padding:10px 12px}input:focus-visible,textarea:focus-visible,button:focus-visible{outline:3px solid var(--brand);outline-offset:2px}.shell{max-width:760px;margin:0 auto;padding:48px 20px 64px}.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:28px}.small{color:var(--muted);font-size:.87rem}