:root{color-scheme:light;--red:#b91c1c;--bg:#f8f7f5;--ink:#111;--muted:#6b7280;--line:#e5e7eb}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--ink);font:16px/1.45 -apple-system,system-ui,Segoe UI,Roboto,sans-serif}main{max-width:720px;margin:0 auto;padding:24px 16px 48px}h1{font-size:22px;margin:0 0 4px}.sub{color:var(--muted);margin:0 0 24px}.card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px}.btn,button{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:0;background:var(--red);color:#fff;font-weight:600;font-size:17px;padding:14px 18px;border-radius:10px;width:100%;cursor:pointer}button:disabled{opacity:.5}input{width:100%;font-size:17px;padding:12px 14px;border:1px solid var(--line);border-radius:10px;margin:6px 0 14px}label{font-weight:600;font-size:14px}.err{color:var(--red);margin:0 0 12px}.tag{display:inline-block;font-size:12px;padding:2px 8px;border-radius:999px;background:#eee;color:#333}