body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: #f4f7f6;
    margin: 0;
    display: flex;
    justify-content: center;
}

.container {
    width: 100%;
    max-width: 800px;
    padding: 20px;
    text-align: center;
}

.hidden { display: none; }

.upload-section { margin: 40px 0; }

.upload-btn {
    background: #007aff;
    color: white;
    padding: 12px 30px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
}

canvas {
    max-width: 100%;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    background: white;
}

.controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-top: 20px;
}

.control-group {
    background: white;
    padding: 15px;
    border-radius: 12px;
}

button {
    padding: 8px 15px;
    margin: 5px;
    border: 1px solid #ddd;
    border-radius: 4px;
    background: white;
    cursor: pointer;
}

button:hover { background: #f0f0f0; }

.primary-btn { background: #34c759; color: white; border: none; }

.download-section { margin-top: 30px; }

.download-link {
    display: inline-block;
    padding: 15px 40px;
    background: #5856d6;
    color: white;
    text-decoration: none;
    border-radius: 30px;
    font-weight: bold;
}

footer {
    margin-top: 50px;
    color: #888;
    font-size: 0.9em;
}

footer a { color: #888; text-decoration: none; }