:root{color-scheme:light dark;font-family:system-ui,sans-serif}body{margin:0;background:#f7f7f8}.app{max-width:900px;margin:0 auto;padding:24px}.tabs{display:flex;gap:8px;margin-bottom:16px}.tabs button{padding:8px 16px;border:1px solid #ccc;border-radius:6px;background:#fff;cursor:pointer}.tabs button.active{background:#1a1a2e;color:#fff}.card{background:#fff;border-radius:8px;padding:16px;margin-bottom:12px;box-shadow:0 1px 3px #0000001a}input[type=text],textarea{width:100%;padding:8px;box-sizing:border-box;border:1px solid #ccc;border-radius:6px}button.primary{background:#1a1a2e;color:#fff;border:none;padding:8px 16px;border-radius:6px;cursor:pointer}