* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0b0;
    --accent: #00ff88;
    --accent-secondary: #ff00ff;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --transition: all 0.3s ease;
}

body.light-theme {
    --bg-primary: #f0f0f5;
    --bg-secondary: #e0e0ea;
    --text-primary: #1a1a2f;
    --text-secondary: #4a4a5a;
    --accent: #00cc6a;
    --accent-secondary: #cc00cc;
    --glass-bg: rgba(0, 0, 0, 0.05);
    --glass-border: rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    overflow-x: hidden;
    line-height: 1.6;
}

nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(10px);
    padding: 1rem 2rem;
    z-index: 1000;
    border-bottom: 1px solid var(--glass-border);
}

nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
    justify-content: center;
    flex-wrap: wrap;
}

nav a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

nav a:hover, nav a:focus {
    color: var(--accent);
    outline: none;
}

nav a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: var(--transition);
}

nav a:hover::after, nav a:focus::after {
    width: 100%;
}

.controls {
    position: fixed;
    top: 80px;
    right: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 999;
    background: var(--glass-bg);
    padding: 15px;
    border-radius: 10px;
    border: 1px solid var(--glass-border);
}

.control-btn {
    padding: 10px 20px;
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    border: none;
    border-radius: 5px;
    color: white;
    font-weight: bold;
    cursor: pointer;
    transition: var(--transition);
    font-size: 14px;
}

.control-btn:hover, .control-btn:focus {
    transform: scale(1.05);
    box-shadow: 0 0 20px rgba(0, 255, 136, 0.5);
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.control-btn:active {
    transform: scale(0.95);
}

.lang-switcher {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.lang-switcher label {
    font-size: 12px;
    color: var(--text-secondary);
}

.lang-switcher select {
    padding: 8px;
    border-radius: 5px;
    border: 1px solid var(--glass-border);
    background: var(--bg-secondary);
    color: var(--text-primary);
    cursor: pointer;
}

.lang-switcher select:focus {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

main {
    padding-top: 100px;
}

.section {
    min-height: 100vh;
    padding: 60px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.section h2 {
    font-size: 2.5rem;
    margin-bottom: 30px;
    text-align: center;
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero {
    text-align: center;
    padding: 60px 20px;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    letter-spacing: 3px;
}

.hero p {
    font-size: 1.5rem;
    color: var(--text-secondary);
}

#heroParticles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.visual-container, .game-container, .sorting-container, .audio-container {
    width: 100%;
    max-width: 800px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 15px;
    padding: 20px;
    backdrop-filter: blur(5px);
}

canvas {
    display: block;
    width: 100%;
    border-radius: 10px;
    background: var(--bg-secondary);
}

.visual-controls, .game-controls, .sorting-controls, .audio-controls {
    display: flex;
    gap: 15px;
    margin-top: 20px;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
}

.sorting-visual {
    height: 300px;
    display: flex;
    align-items: flex-end;
    gap: 2px;
    padding: 20px;
}

.bar {
    flex: 1;
    background: linear-gradient(180deg, var(--accent), var(--accent-secondary));
    border-radius: 3px 3px 0 0;
    transition: height 0.1s ease;
}

.about-content {
    max-width: 600px;
    text-align: left;
}

.about-content ul {
    list-style: none;
    margin-top: 20px;
}

.about-content li {
    padding: 10px 0;
    border-bottom: 1px solid var(--glass-border);
    position: relative;
    padding-left: 30px;
}

.about-content li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: bold;
}

footer {
    text-align: center;
    padding: 30px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--glass-border);
}

body.low-spec-mode canvas {
    image-rendering: pixelated;
}

body.low-spec-mode .glitch-text {
    animation: none !important;
}

body.low-spec-mode .fade-in {
    animation: none !important;
}

@media (max-width: 768px) {
    nav ul {
        gap: 1rem;
    }
    
    .controls {
        position: relative;
        top: 0;
        right: 0;
        flex-direction: row;
        flex-wrap: wrap;
        margin: 20px;
    }
    
    main {
        padding-top: 20px;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .section h2 {
        font-size: 1.8rem;
    }
}