:root {
    --primary-color: #00f0ff;
    --secondary-color: #ff00e5;
    --accent-color: #f0ff00;
    --bg-dark: #0a0a0f;
    --bg-darker: #050508;
    --bg-card: rgba(20, 20, 30, 0.8);
    --text-primary: #ffffff;
    --text-secondary: #b0b0c0;
    --border-color: rgba(0, 240, 255, 0.3);
    --shadow-glow: 0 0 20px rgba(0, 240, 255, 0.3);
    --font-display: 'Orbitron', sans-serif;
    --font-body: 'Inter', sans-serif;
    --transition-fast: 0.2s ease;
    --transition-medium: 0.4s ease;
    --transition-slow: 0.8s ease;
    --particle-count: 150;
    --fractal-detail: 200;
    --animation-complexity: 1;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color);
    color: var(--bg-dark);
    padding: 8px 16px;
    z-index: 1000;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 0;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.main-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: linear-gradient(180deg, var(--bg-darker) 0%, transparent 100%);
    backdrop-filter: blur(10px);
    padding: 1rem 2rem;
}

.main-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
}

.nav-brand h1 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: all var(--transition-fast);
    transform: translateX(-50%);
}

.nav-link:hover,
.nav-link:focus,
.nav-link.active {
    color: var(--primary-color);
}

.nav-link:hover::after,
.nav-link:focus::after,
.nav-link.active::after {
    width: 80%;
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.control-btn {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.control-btn:hover,
.control-btn:focus {
    background: var(--primary-color);
    color: var(--bg-dark);
    box-shadow: var(--shadow-glow);
}

.control-btn:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

.control-btn[aria-pressed="true"] {
    background: var(--secondary-color);
    border-color: var(--secondary-color);
}

.icon-moon {
    display: none;
}

[data-theme="light"] .icon-sun {
    display: none;
}

[data-theme="light"] .icon-moon {
    display: inline;
}

.language-switcher select {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.5rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.85rem;
}

.language-switcher select:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.section {
    min-height: 100vh;
    padding: 120px 2rem 4rem;
    max-width: 1400px;
    margin: 0 auto;
}

.section h2 {
    font-family: var(--font-display);
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-section {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
}

#hero-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-content h2 {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.cta-button {
    display: inline-block;
    padding: 1rem 2rem;
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    text-decoration: none;
    font-family: var(--font-display);
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    transition: all var(--transition-fast);
    border-radius: 4px;
}

.cta-button:hover,
.cta-button:focus {
    background: var(--primary-color);
    color: var(--bg-dark);
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
}

.visuals-section {
    background: linear-gradient(180deg, transparent 0%, rgba(0, 240, 255, 0.02) 50%, transparent 100%);
}

.visuals-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.visual-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.visual-card:hover,
.visual-card:focus-within {
    transform: translateY(-5px);
    box-shadow: var(--shadow-glow);
}

.visual-card h3 {
    font-family: var(--font-display);
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.visual-canvas {
    width: 100%;
    height: 200px;
    background: var(--bg-darker);
    border-radius: 8px;
    margin-bottom: 1rem;
}

.visual-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.games-section {
    background: linear-gradient(180deg, transparent 0%, rgba(255, 0, 229, 0.02) 50%, transparent 100%);
}

.games-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
}

.game-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
}

.game-panel h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--secondary-color);
}

.game-canvas {
    background: var(--bg-darker);
    border-radius: 8px;
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
}

.game-controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 1rem;
}

.game-btn, .data-btn, .audio-btn {
    background: transparent;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    cursor: pointer;
    font-family: var(--font-display);
    font-size: 0.85rem;
    text-transform: uppercase;
    transition: all var(--transition-fast);
}

.game-btn:hover, .game-btn:focus,
.data-btn:hover, .data-btn:focus,
.audio-btn:hover, .audio-btn:focus {
    background: var(--primary-color);
    color: var(--bg-dark);
}

.game-btn:focus, .data-btn:focus, .audio-btn:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

.game-score {
    font-family: var(--font-display);
    font-size: 1.2rem;
    color: var(--accent-color);
}

.game-hint {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-top: 0.5rem;
}

.reaction-area {
    width: 100%;
    height: 200px;
    background: #333;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background var(--transition-fast);
    margin-bottom: 1rem;
    border: 2px solid var(--border-color);
}

.reaction-area:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

.reaction-area.waiting {
    background: #cc0000;
}

.reaction-area.ready {
    background: #00cc00;
}

.reaction-area.clicked {
    background: #0066cc;
}

.reaction-result {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.data-section {
    background: linear-gradient(180deg, transparent 0%, rgba(240, 255, 0, 0.02) 50%, transparent 100%);
}

.data-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
}

.data-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
}

.data-panel h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--accent-color);
}

.data-canvas {
    width: 100%;
    height: 250px;
    background: var(--bg-darker);
    border-radius: 8px;
    margin-bottom: 1rem;
}

.data-controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.data-controls select {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
}

.data-controls select:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.chart-legend {
    display: flex;
    gap: 2rem;
    justify-content: center;
    margin-top: 1rem;
}

.chart-legend span {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.audio-section {
    background: linear-gradient(180deg, transparent 0%, rgba(0, 240, 255, 0.02) 50%, transparent 100%);
}

.audio-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
}

.audio-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
}

.audio-panel h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.piano-roll {
    display: flex;
    justify-content: center;
    position: relative;
    height: 120px;
    margin-bottom: 1rem;
}

.piano-key {
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-display);
    font-size: 0.7rem;
}

.piano-key.white {
    width: 40px;
    height: 100%;
    background: linear-gradient(180deg, #f0f0f0 0%, #ffffff 100%);
    border: 1px solid #ccc;
    border-radius: 0 0 4px 4px;
    color: #333;
    z-index: 1;
}

.piano-key.black {
    width: 30px;
    height: 60%;
    background: linear-gradient(180deg, #333 0%, #000 100%);
    border-radius: 0 0 4px 4px;
    color: #fff;
    margin-left: -15px;
    margin-right: -15px;
    z-index: 2;
}

.piano-key:hover,
.piano-key:focus {
    transform: translateY(2px);
}

.piano-key:active,
.piano-key.active {
    transform: translateY(4px);
}

.piano-key.white:active,
.piano-key.white.active {
    background: linear-gradient(180deg, #ddd 0%, #eee 100%);
}

.piano-key.black:active,
.piano-key.black.active {
    background: linear-gradient(180deg, #222 0%, #000 100%);
}

.piano-key:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: -2px;
}

.piano-hint {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.audio-canvas {
    width: 100%;
    height: 200px;
    background: var(--bg-darker);
    border-radius: 8px;
    margin-bottom: 1rem;
}

.about-section {
    background: linear-gradient(180deg, transparent 0%, rgba(255, 0, 229, 0.02) 50%, transparent 100%);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    max-width: 1000px;
    margin: 0 auto;
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.about-text h3 {
    font-family: var(--font-display);
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.features-list {
    list-style: none;
    color: var(--text-secondary);
}

.features-list li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.features-list li::before {
    content: '>';
    position: absolute;
    left: 0;
    color: var(--primary-color);
}

.about-tech h3 {
    font-family: var(--font-display);
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.tech-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tech-badge {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--text-primary);
}

.main-footer {
    text-align: center;
    padding: 2rem;
    background: var(--bg-darker);
    border-top: 1px solid var(--border-color);
}

.main-footer p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-year {
    margin-top: 0.5rem;
    color: var(--primary-color);
}

.performance-indicator {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: var(--secondary-color);
    color: var(--bg-dark);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    font-size: 0.85rem;
    z-index: 1000;
}

.performance-indicator:not(.visually-hidden) {
    display: block;
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .hero-content h2 {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .section h2 {
        font-size: 1.8rem;
    }
    
    .games-container,
    .data-grid,
    .audio-container {
        grid-template-columns: 1fr;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .visuals-grid {
        grid-template-columns: 1fr;
    }
}