body {
    font-family: system-ui, sans-serif;
    background: #f5f6fa;
    margin: 0;
}

.container {
    max-width: 420px;
    margin: auto;
    padding: 20px;
}

h2 {
    text-align: center;
    margin-bottom: 20px;
}

.input {
    width: 100%;
    padding: 14px;
    margin-bottom: 12px;
    border-radius: 10px;
    border: 1px solid #ccc;
    font-size: 16px;
}

.button-group {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

.btn {
    flex: 1;
    padding: 14px;
    border-radius: 10px;
    border: none;
    font-size: 15px;
    cursor: pointer;
}

.primary {
    background: #007bff;
    color: white;
}

.secondary {
    background: #6c757d;
    color: white;
}

.grid {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

    .grid th, .grid td {
        padding: 10px;
        border-bottom: 1px solid #ddd;
    }

.error {
    color: red;
    text-align: center;
}