*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,sans-serif;background:#f5f5f7;color:#1a1a1a}.app-header{background:#1a1a2e;color:#fff;padding:1rem 1.5rem}.app-header h1{margin:0 0 .5rem;font-size:1.5rem}.nav{display:flex;gap:1rem;flex-wrap:wrap}.nav-link{color:#c9c9d9;text-decoration:none;padding:.25rem .5rem;border-radius:4px}.nav-link-active{background:#4a4a7a;color:#fff}.app-main{max-width:900px;margin:0 auto;padding:1.5rem}table{width:100%;border-collapse:collapse;margin:1rem 0}th,td{text-align:left;padding:.5rem .75rem;border-bottom:1px solid #ddd}button{cursor:pointer;border:none;border-radius:4px;padding:.5rem 1rem;background:#4a4a7a;color:#fff;font-size:1rem}button:disabled{background:#aaa;cursor:not-allowed}button.secondary{background:#ddd;color:#1a1a1a}button.danger{background:#b23b3b}input,select{padding:.4rem;font-size:1rem;border:1px solid #ccc;border-radius:4px}.form-row{display:flex;flex-direction:column;gap:.25rem;margin-bottom:1rem;max-width:320px}.card{background:#fff;border-radius:8px;padding:1rem;margin-bottom:1rem;box-shadow:0 1px 3px #0000001a}.amount-positive{color:#1a7a3a;font-weight:600}.amount-negative{color:#b23b3b;font-weight:600}