body {
    font-family: Arial, sans-serif;
    background: #eef2ff;
    margin: 0;
    padding: 20px;
}

.container {
    max-width: 450px;
    margin: auto;
    background: white;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

h1 {
    text-align: center;
}

input {
    width: 100%;
    padding: 12px;
    margin-top: 10px;
    border-radius: 8px;
    border: 1px solid #ccc;
}

button {
    width: 100%;
    padding: 12px;
    margin-top: 12px;
    background: #2563eb;
    color: white;
    border: none;
    cursor: pointer;
    border-radius: 8px;
    font-size: 16px;
}

button:hover {
    background: #1e4ed8;
}

.units {
    margin-top: 10px;
}

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

.card {
    margin-top: 20px;
    background: #f1f5f9;
    padding: 20px;
    border-radius: 10px;
    text-align: center;
}

.hidden {
    display: none;
}

img {
    width: 80px;
    height: 80px;
}