:root {
    --bg-color: #1a1a1a;
    --text-color: #f0f0f0;
    --accent-color: #00ffcc;
    --control-bg: #2a2a2a;
    --border-color: #333;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background-color: var(--control-bg);
    padding: 1rem;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.back-link {
    color: var(--accent-color);
    text-decoration: none;
    margin-right: 2rem;
    font-weight: bold;
}

h1 {
    margin: 0;
    font-size: 1.5rem;
}

main {
    display: flex;
    flex: 1;
    overflow: hidden;
}

.controls-container {
    width: 250px;
    background-color: var(--control-bg);
    padding: 1rem;
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    z-index: 10;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.control-group label {
    font-weight: bold;
    font-size: 0.9rem;
}

.control-group input[type="range"] {
    width: 100%;
}

.control-group.buttons {
    margin-top: auto;
    gap: 1rem;
}

button {
    padding: 0.8rem;
    background-color: var(--accent-color);
    border: none;
    border-radius: 4px;
    color: #000;
    font-weight: bold;
    cursor: pointer;
    transition: opacity 0.2s;
}

button:hover {
    opacity: 0.8;
}

#clear-btn {
    background-color: #ff4d4d;
    color: white;
}

.canvas-wrapper {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #000;
    position: relative;
    overflow: hidden;
}

canvas {
    cursor: crosshair;
    display: block;
}

@media (max-width: 768px) {
    main {
        flex-direction: column;
    }

    .controls-container {
        width: 100%;
        flex-direction: row;
        flex-wrap: wrap;
        padding: 0.5rem;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        height: auto;
    }

    .control-group {
        flex: 1;
        min-width: 120px;
    }

    .control-group.buttons {
        margin-top: 0;
        width: 100%;
        flex-direction: row;
    }
}