/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #6366f1;
    --secondary-color: #8b5cf6;
    --accent-color: #ec4899;
    --background-dark: #0f172a;
    --background-light: #f8fafc;
    --text-dark: #1e293b;
    --text-light: #f1f5f9;
    --card-bg: rgba(255, 255, 255, 0.1);
    --border-radius: 12px;
    --transition: all 0.3s ease;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --glow: 0 0 20px rgba(99, 102, 241, 0.5);
}

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

/* Header Styles */
header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    padding: 1rem 2rem;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

nav h1 {
    font-size: 1.8rem;
    background: linear-gradient(45deg, 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-menu a {
    color: inherit;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.nav-menu a:hover {
    background: var(--card-bg);
    transform: translateY(-2px);
}

/* Controls */
.controls {
    display: flex;
    gap: 1rem;
}

.control-btn {
    background: var(--card-bg);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: inherit;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
}

.control-btn:hover {
    background: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--glow);
}

/* Language Switcher */
.language-switcher {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 1001;
    display: flex;
    gap: 0.5rem;
}

.lang-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.3);
    background: var(--card-bg);
    color: inherit;
    cursor: pointer;
    transition: var(--transition);
    font-weight: bold;
}

.lang-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    box-shadow: var(--glow);
}

/* Main Content */
main {
    margin-top: 80px;
    padding: 2rem;
}

/* Hero Section */
.hero {
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 4rem 2rem;
}

.hero-content h2 {
    font-size: 3rem;
    margin-bottom: 1rem;
    background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-content p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto 3rem;
    opacity: 0.9;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: var(--border-radius);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--glow);
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

/* Demo Sections */
.demo-section {
    min-height: 100vh;
    padding: 4rem 2rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    background: linear-gradient(45deg, var(--secondary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.demo-container {
    max-width: 1200px;
    margin: 0 auto;
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 2rem;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Canvas and Container Styles */
#particles-canvas, #sorting-canvas, #audio-canvas {
    width: 100%;
    height: 400px;
    border-radius: var(--border-radius);
    background: rgba(0, 0, 0, 0.2);
}

#threejs-container {
    width: 100%;
    height: 500px;
    border-radius: var(--border-radius);
    background: rgba(0, 0, 0, 0.2);
    position: relative;
    overflow: hidden;
}

/* Controls Panel */
.controls-panel {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 1rem;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.1);
    border-radius: var(--border-radius);
    align-items: center;
}

.demo-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 600;
}

.demo-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--glow);
}

.slider-group {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.slider-group input[type="range"] {
    width: 150px;
}

/* Game Styles */
.game-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.game-stats {
    display: flex;
    gap: 2rem;
    background: rgba(0, 0, 0, 0.2);
    padding: 1rem 2rem;
    border-radius: var(--border-radius);
}

.stat {
    text-align: center;
}

.stat-label {
    display: block;
    font-size: 0.9rem;
    opacity: 0.8;
}

#target {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--glow);
}

#target.ready {
    background: #10b981;
    animation: pulse 1s infinite;
}

#target.clicked {
    background: #ef4444;
    transform: scale(0.8);
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

/* Audio Visualizer */
.audio-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.visualization-type {
    display: flex;
    gap: 1rem;
}

.viz-type-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: inherit;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
}

.viz-type-btn.active {
    background: var(--primary-color);
}

/* About Section */
.about-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
    max-width: 800px;
    margin: 0 auto;
}

.tech-stack ul, .features ul {
    list-style: none;
    padding: 1rem 0;
}

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

.tech-stack li::before, .features li::before {
    content: "▶";
    position: absolute;
    left: 0;
    color: var(--primary-color);
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* Responsive Design */
@media (max-width: 768px) {
    nav {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }
    
    .controls {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .hero-content h2 {
        font-size: 2rem;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .game-stats {
        flex-direction: column;
        gap: 1rem;
    }
    
    .controls-panel {
        flex-direction: column;
        align-items: stretch;
    }
    
    .slider-group {
        justify-content: space-between;
    }
}