body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    padding: 30px;
    background: #2c3e50;
    color: #ecf0f1;
    display: flex;
    justify-content: center;
}
#container {
    background: #34495e;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    max-width: 500px;
    width: 100%;
}
h2 { margin-top: 0; color: #3498db; }

.control-group {
    margin-bottom: 15px;
    background: rgba(0,0,0,0.2);
    padding: 10px;
    border-radius: 6px;
}

label { display: block; font-size: 0.8rem; margin-bottom: 5px; color: #bdc3c7; }

canvas {
    border: 2px solid #222;
    image-rendering: pixelated;
    background: #000;
    display: block;
    margin: 20px auto;
    width: 100%;
    max-width: 400px;
    height: auto;
}

button {
    background-color: #3498db;
    color: white;
    border: none;
    margin-bottom: 20px;
    padding: 12px 20px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: bold;
    width: 100%;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

button:hover {
    background-color: #2980b9;
}

button:active {
    transform: scale(0.98);
    background-color: #1f6391;
}

button:disabled {
    background-color: #5d6d7e;
    cursor: progress;
}

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

input[type="checkbox"] {
    width: auto;
    margin-right: 8px;
    vertical-align: middle;
}

.info { font-family: monospace; font-size: 0.9rem; background: #222; padding: 10px; border-radius: 4px; color: #2ecc71; }
.info.error { color: #e74c3c; }
input[type="range"] { width: 100%; }

input[type="file"]::file-selector-button {
    background: #3498db;
    border: none;
    border-radius: 4px;
    color: white;
    padding: 8px 16px;
    cursor: pointer;
    margin-right: 15px;
    font-family: inherit;
    font-size: 0.85rem;
    text-transform: uppercase;
}

input[type="file"]::file-selector-button:hover {
    background: #2980b9;
}

input[type="file"] {
    color: #bdc3c7;
    font-size: 0.9rem;
}