body {
    font-family: sans-serif;
    background-color: #f4f4f4;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 2em 0;
}

.container {
    background: white;
    padding: 2em;
    border-radius: 8px;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
    width: 90%;
    max-width: 600px;
}

h1 {
    text-align: center;
    color: #333;
}

textarea {
    width: 100%;
    box-sizing: border-box;
    height: 100px;
    margin-bottom: 1em;
    padding: 0.5em;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 1em;
}

.controls-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1em;
    margin-bottom: 1.5em;
}

.control-item {
    display: flex;
    flex-direction: column;
}

label {
    margin-bottom: 0.5em;
    font-weight: bold;
    color: #555;
}

select, input[type="text"], input[type="number"] {
    padding: 0.8em;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 1em;
    width: 100%;
    box-sizing: border-box;
}

input[type="color"] {
    width: 100%;
    height: 45px;
    border: 1px solid #ccc;
    border-radius: 4px;
    padding: 5px;
    box-sizing: border-box;
}

button {
    background-color: #007bff;
    color: white;
    cursor: pointer;
    border: none;
    padding: 0.8em 1.2em;
    border-radius: 4px;
    font-size: 1em;
    width: 100%;
    margin-bottom: 1em;
}

button:hover {
    background-color: #0056b3;
}

#download-btn {
    background-color: #28a745;
}

#download-btn:hover {
    background-color: #218838;
}

canvas {
    display: block;
    margin: 1em auto;
    border: 1px dashed #ccc;
    max-width: 100%;
}