body {
    font-family: Arial, sans-serif;
    background: #f4f4f4;
    margin: 0;
    padding: 20px;
    text-align: center;
}

h1 {
    margin-bottom: 20px;
}

/* SIDE-BY-SIDE LAYOUT */
.container {
    display: flex;
    gap: 20px;
    justify-content: center;
    align-items: flex-start;
    flex-wrap: wrap;
}

/* LEFT = CONTROLS */
.left-panel {
    width: 300px;
    background: white;
    padding: 15px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

/* RIGHT = PREVIEW */
.right-panel {
    width: 420px;
    background: white;
    padding: 15px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

#preview {
    width: 100%;
    max-height: 500px;
    object-fit: contain;
    display: none;
    border: 1px solid #ccc;
}

.control-group {
    margin-bottom: 15px;
}

input, select {
    width: 100%;
    padding: 8px;
    margin-top: 5px;
    box-sizing: border-box;
}

button {
    width: 100%;
    padding: 10px;
    background: #007bff;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

button:hover {
    background: #0056b3;
}

.download-btn {
    background: #28a745;
    margin-top: 10px;
}

.download-btn:hover {
    background: #1f8a38;
}