:root {
    /* Default skin: Cyber Glow */
    --primary-color: #0ff;
    --primary-color-dark: #0aa;
    --primary-color-glow: rgba(0, 255, 255, 0.7);
    --secondary-color: #f0f;
    --secondary-color-rgb: 255, 0, 255;
    --tertiary-color: #ff0;
    --text-color: #ffffff;
    --text-color-medium: #b0d0d0;
    --text-color-light: #99aabb;
    --background-color-dark: #000000;
    --panel-bg-rgb: 5, 15, 25;
    --panel-border-rgb: 0, 255, 255;
    --welcome-gradient-rgb: 0, 25, 40;
    --player-ui-gradient-start-rgb: 0, 10, 17;
    --player-ui-gradient-end-rgb: 0, 25, 40;

    /* GUI appearance variables */
    --gui-bg-alpha: 0.6;
    --gui-blur-strength: 12px;
}

body {
    margin: 0;
    padding: 0;
    background-color: var(--background-color-dark);
    color: var(--text-color);
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    overflow: hidden;
}

body.skin-arcade-night {
    --primary-color: #ff00ff;
    --primary-color-dark: #cc00cc;
    --primary-color-glow: rgba(255, 0, 255, 0.7);
    --secondary-color: #00ffff;
    --secondary-color-rgb: 0, 255, 255;
    --text-color-medium: #e0c0e0;
    --text-color-light: #c0a0c0;
    --background-color-dark: #100818;
    --panel-bg-rgb: 20, 5, 30;
    --panel-border-rgb: 255, 0, 255;
    --welcome-gradient-rgb: 30, 0, 40;
    --player-ui-gradient-start-rgb: 20, 5, 30;
    --player-ui-gradient-end-rgb: 30, 0, 40;
}

body.skin-solar-flare {
    --primary-color: #ffa500;
    --primary-color-dark: #cc8400;
    --primary-color-glow: rgba(255, 165, 0, 0.7);
    --secondary-color: #ff4500;
    --secondary-color-rgb: 255, 69, 0;
    --text-color-medium: #ffe0b8;
    --text-color-light: #ffcc99;
    --background-color-dark: #1a0a00;
    --panel-bg-rgb: 40, 15, 0;
    --panel-border-rgb: 255, 165, 0;
    --welcome-gradient-rgb: 40, 15, 0;
    --player-ui-gradient-start-rgb: 40, 15, 0;
    --player-ui-gradient-end-rgb: 50, 20, 0;
}

body.skin-monochrome {
    --primary-color: #ffffff;
    --primary-color-dark: #cccccc;
    --primary-color-glow: rgba(255, 255, 255, 0.5);
    --secondary-color: #bbbbbb;
    --secondary-color-rgb: 187, 187, 187;
    --text-color-medium: #dddddd;
    --text-color-light: #bbbbbb;
    --background-color-dark: #000000;
    --panel-bg-rgb: 25, 25, 25;
    --panel-border-rgb: 255, 255, 255;
    --welcome-gradient-rgb: 30, 30, 30;
    --player-ui-gradient-start-rgb: 20, 20, 20;
    --player-ui-gradient-end-rgb: 30, 30, 30;
}

#container {
    width: 100vw;
    height: 100vh;
    position: relative;
}

#visualizer {
    display: block;
    width: 100%;
    height: 100%;
}

#top-sliders {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    padding: 10px 20px;
    box-sizing: border-box;
    background: linear-gradient(to bottom, rgba(var(--player-ui-gradient-start-rgb), 0.65) 0%, transparent 100%);
    z-index: 15;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 40px;
    transition: opacity 1s ease-in-out, transform 1s ease-in-out;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
}

#top-sliders.visible {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
}

#top-sliders .slider-control {
    display: flex;
    align-items: center;
    gap: 10px;
}

#top-sliders .slider-control label {
    font-size: 0.9em;
    color: var(--primary-color);
    text-shadow: 0 0 5px var(--primary-color-glow);
    font-weight: 400;
}

#top-sliders .slider-control input[type="range"] {
    width: 200px;
}

#countdown-display {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(1);
    font-size: 25vmin;
    font-weight: bold;
    color: white;
    text-shadow: 0 0 20px var(--primary-color), 0 0 40px var(--primary-color), 0 0 80px var(--primary-color-glow);
    z-index: 999;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s ease-in-out, transform 0.1s ease-in-out;
}

/* Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0s 0.3s;
}

.modal-overlay.visible {
    opacity: 1;
    visibility: visible;
    transition: opacity 0.3s ease;
}

.modal-content {
    background: rgba(var(--panel-bg-rgb), 0.65);
    border: 1px solid rgba(var(--panel-border-rgb), 0.2);
    border-radius: 12px;
    padding: 30px 40px;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    position: relative;
    transform: scale(0.95);
    transition: transform 0.3s ease;
}

.modal-overlay.visible .modal-content {
    transform: scale(1);
}

.modal-content h2 {
    font-size: 2em;
    font-weight: 300;
    color: var(--primary-color);
    text-shadow: 0 0 8px var(--primary-color-glow);
    margin-top: 0;
    margin-bottom: 20px;
    text-align: center;
}

.modal-content ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.modal-content li {
    font-size: 1.1em;
    color: var(--text-color-medium);
    padding: 10px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.modal-content li:last-child {
    border-bottom: none;
}

.modal-content strong {
    color: var(--primary-color);
    font-weight: 500;
}

.modal-close-btn {
    position: absolute;
    top: 10px;
    right: 15px;
    background: none;
    border: none;
    color: var(--text-color-light);
    font-size: 2.5em;
    line-height: 1;
    cursor: pointer;
    transition: color 0.3s, transform 0.3s;
    padding: 0;
}

.modal-close-btn:hover {
    color: var(--text-color);
    transform: scale(1.1);
}