body {
    margin: 0;
    overflow: hidden;
    background-color: #e0e0e0;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    transition: background-color 0.2s;
}

canvas {
    display: block;
    cursor: none; /* Hide default cursor */
}

/* --- UI Controls --- */

/* Open Button (Visible by default) */
#openControls {
    position: absolute;
    bottom: 20px;
    right: 20px;
    padding: 10px 20px;
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(0,0,0,0.1);
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    color: #333;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    transition: transform 0.2s, background 0.2s;
    z-index: 100;
}

#openControls:hover {
    transform: translateY(-2px);
    background: #fff;
}

/* Panel Container (Hidden by default) */
#controls {
    display: none; /* Default hidden */
    position: absolute;
    bottom: 20px;
    right: 20px;
    width: 340px;
    max-height: 85vh;
    overflow-y: auto;
    background: rgba(255, 255, 255, 0.95);
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.25);
    backdrop-filter: blur(12px);
    user-select: none;
    border: 1px solid rgba(255,255,255,0.6);
    z-index: 101;
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Header with Hide button */
.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    border-bottom: 1px solid #eee;
    padding-bottom: 10px;
}

h3 {
    margin: 0;
    font-size: 16px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #111;
}

#closeControls {
    background: #f0f0f0;
    border: none;
    padding: 5px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    font-weight: bold;
    color: #555;
    transition: background 0.2s;
}
#closeControls:hover {
    background: #ddd;
    color: #000;
}

/* Scrollbar */
#controls::-webkit-scrollbar { width: 6px; }
#controls::-webkit-scrollbar-thumb { background-color: #ccc; border-radius: 3px; }

/* Controls Layout */
.control-group {
    margin-bottom: 15px;
    display: flex;
    flex-direction: column;
}

.color-row {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 15px;
}
.color-item { flex: 1; }

label {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    margin-bottom: 5px;
    font-weight: 600;
    color: #333;
}

input[type="range"] {
    width: 100%;
    cursor: pointer;
    height: 6px;
    background: #ddd;
    border-radius: 3px;
    appearance: none;
}
input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 16px;
    height: 16px;
    background: #444;
    border-radius: 50%;
    cursor: pointer;
    transition: background 0.2s;
}
input[type="range"]::-webkit-slider-thumb:hover { background: #000; }

input[type="file"] {
    font-size: 11px;
    width: 100%;
    color: #555;
}

input[type="color"] {
    width: 100%;
    height: 30px;
    border: 1px solid #ddd;
    border-radius: 4px;
    cursor: pointer;
    background: none;
    padding: 2px;
}

.divider {
    height: 1px;
    background: #eee;
    margin: 15px 0;
}