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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f4f4f4;
    transition: background-color 0.3s, color 0.3s;
}

nav {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
}

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

.nav-menu li {
    margin: 0 1rem;
}

.nav-menu a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-menu a:hover {
    color: #007bff;
}

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

button {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

#theme-toggle, #performance-toggle {
    background: #007bff;
    color: white;
}

#theme-toggle:hover, #performance-toggle:hover {
    background: #0056b3;
}

.lang-switcher {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

main {
    margin-top: 80px;
}

.section {
    min-height: 100vh;
    padding: 4rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.hero {
    text-align: center;
    padding: 4rem 0;
}

.hero h2 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    color: #666;
}

.section h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    text-align: center;
}

#threejs-container, #pong-game, #sorting-visualizer, #audio-visualizer {
    width: 100%;
    height: 400px;
    border: 1px solid #ddd;
    border-radius: 10px;
    margin: 2rem 0;
}

footer {
    text-align: center;
    padding: 2rem;
    background: #333;
    color: white;
}

/* Dark theme */
body.dark {
    background-color: #222;
    color: #f4f4f4;
}

body.dark nav {
    background: rgba(34, 34, 34, 0.95);
}

body.dark .nav-menu a {
    color: #f4f4f4;
}

body.dark .nav-menu a:hover {
    color: #007bff;
}

body.dark button {
    background: #444;
    color: #f4f4f4;
}

body.dark button:hover {
    background: #555;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
    }

    .nav-controls {
        flex-wrap: wrap;
        justify-content: center;
    }

    .hero h2 {
        font-size: 2rem;
    }

    .section h2 {
        font-size: 2rem;
    }
}