:root {
    --bg-color: #1e1e1e;
    --text-color: #e0e0e0;
    --text-shadow: 0 0 20px rgba(255, 255, 255, 0.1);
    --panel-bg: rgba(30, 30, 30, 0.95);
    --panel-border: rgba(255, 255, 255, 0.1);
    --input-bg: rgba(0, 0, 0, 0.3);
    --input-color: #e0e0e0;
    --btn-hover: rgba(255, 255, 255, 0.1);
}

[data-theme="light"] {
    --bg-color: #f0f0f0;
    --text-color: #333333;
    --text-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
    --panel-bg: rgba(255, 255, 255, 0.95);
    --panel-border: rgba(0, 0, 0, 0.1);
    --input-bg: rgba(0, 0, 0, 0.05);
    --input-color: #333333;
    --btn-hover: rgba(0, 0, 0, 0.05);
}

.bg-gradient-layer {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -3;
    pointer-events: none;
    transition: opacity 1.5s cubic-bezier(0.4, 0, 0.2, 1);
}

#bg-layer-dark {
    background: linear-gradient(135deg, rgba(255,255,255,0.05) 0%, rgba(0,0,0,0.6) 100%);
    opacity: 1;
}

#bg-layer-light {
    background: linear-gradient(135deg, rgba(255,255,255,0.8) 0%, rgba(0,0,0,0.1) 100%);
    opacity: 0;
}

[data-theme="light"] #bg-layer-dark {
    opacity: 0;
}

[data-theme="light"] #bg-layer-light {
    opacity: 1;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, transparent 0%, rgba(0,0,0,0.05) 100%);
    pointer-events: none;
    z-index: -2;
}