/* --- Frames Size Synchronization --- */
.canvas-container {
    position: relative;
    width: 100%;
    height: 500px;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 16px;
    border: 1px solid var(--glass-border);
    box-shadow: inset 0 2px 10px rgba(0,0,0,0.02);
    overflow: hidden;
    cursor: default;
}

canvas {
    display: block;
    width: 100%;
    height: 100%;
}

/* --- Sidebar: Spectrum --- */
.spectrum-sidebar {
    height: 500px;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1.5rem;
}

.spectrum-column {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    height: 100%;
}

.spectrum-column h3 {
    margin: 0;
    color: var(--text-light);
    font-size: 1rem;
    font-weight: 700;
}

.spectrum-track {
    position: relative;
    width: 40px;
    flex-grow: 1; 
    background: #fff;
    border-radius: 20px;
    border: 1px solid rgba(0,0,0,0.1);
    padding: 4px;
    box-shadow: inset 0 2px 5px rgba(0,0,0,0.05);
}

.spectrum-gradient {
    width: 100%;
    height: 100%;
    border-radius: 16px;
    background: linear-gradient(to bottom, 
        #8b00ff 0%,   
        #0000ff 17%,  
        #00ff00 33%,  
        #ffff00 50%,  
        #ff7f00 67%,  
        #ff0000 83%,  
        #800000 100% 
    );
}

.spectrum-indicator {
    position: absolute;
    left: 45px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.2rem;
    color: var(--text-main);
    transition: top 0.1s linear;
}

.color-info {
    font-weight: 600;
    color: var(--text-main);
    font-family: 'Roboto Mono', monospace;
    min-height: 1.5em;
    text-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

/* --- UI Layer & Controls --- */
.ui-layer {
    position: absolute;
    bottom: 4px !important;
    left: 4px !important;
    right: 4px !important;
    z-index: 10;
}

.panel-bottom {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(8px);
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    border: 1px solid rgba(255,255,255,0.8);
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

/* Play Button */
.control-group-left {
    padding-right: 1rem;
    border-right: 1px solid rgba(0,0,0,0.1);
}

.control-btn {
    background: #f0f2f5;
    border: none;
    cursor: pointer;
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 10px;
    border-radius: 8px;
    transition: all 0.2s;
    width: 42px;
    height: 42px;
}

.control-btn:hover { background: #e2e8f0; transform: translateY(-1px); }
.control-btn:active { transform: scale(0.95); }

/* Sliders */
.control-group-sliders {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.slider-row {
    display: flex;
    align-items: center;
    width: 100%;
    gap: 0.8rem;
    font-size: 1rem;
    color: var(--text-light);
    font-weight: 500;
}

.slider-row label {
    min-width: 90px;
    text-align: right;
}

.val-display {
    min-width: 75px;
    text-align: left;
    font-family: 'Roboto Mono', monospace;
    font-size: 0.9rem;
    color: var(--text-main);
}

input[type=range] {
    flex-grow: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 4px; 
    background: #cbd5e0;
    border-radius: 2px;
    outline: none;
}

input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    box-shadow: 0 2px 5px rgba(0,0,0,0.15); 
    transition: transform 0.1s;
}

input[type=range]::-webkit-slider-thumb:hover { transform: scale(1.2); }