:root{--bg:#f7fafc;--fg:#111827;--panel:#fff;--border:#d1d5db;--muted:#6b7280;--accent:#0f766e;--danger:#b91c1c}*{box-sizing:border-box}html,body{background:radial-gradient(circle at top,#fff 0%,var(--bg)60%);color:var(--fg);margin:0;padding:0;font-family:Avenir Next,Segoe UI,sans-serif}a{color:inherit;text-decoration:none}main{max-width:920px;margin:0 auto;padding:2rem 1rem}.card{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:1rem}.muted{color:var(--muted)}button{cursor:pointer}