:root{--bg:#f4f4f5;--fg:#18181b;--muted:#52525b;--accent:#b45309;--card:#fff;--border:#e4e4e7}*{box-sizing:border-box}html,body{background:var(--bg);color:var(--fg);margin:0;padding:0;font-family:Segoe UI,system-ui,sans-serif;line-height:1.5}a{color:var(--accent)}main{max-width:720px;margin:0 auto;padding:2rem 1.25rem 4rem}.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:1.5rem}.btn{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:8px;padding:.75rem 1.1rem;font-weight:700;text-decoration:none;display:inline-block}.btn.secondary{color:var(--fg);border:1px solid var(--border);background:#fff}.muted{color:var(--muted)}input{border:1px solid var(--border);border-radius:8px;width:100%;margin:.35rem 0 .75rem;padding:.75rem;font-size:1rem}nav{border-bottom:1px solid var(--border);background:#fff;justify-content:space-between;align-items:center;gap:1rem;padding:1rem 1.25rem;display:flex}nav .brand{color:var(--fg);font-weight:800;text-decoration:none}