:root[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-card: #2d2d2d;
    --text-primary: #ffffff;
    --text-secondary: #b3b3b3;
    --neon-yellow: #ffd700;
    --neon-glow: rgba(255, 215, 0, 0.5);
    --neon-dim: rgba(255, 215, 0, 0.2);
    --card-shadow: 0 0 20px rgba(255, 215, 0, 0.2);
}

:root[data-theme="light"] {
    --bg-primary: #f5f5f5;
    --bg-card: #ffffff;
    --text-primary: #333333;
    --text-secondary: #666666;
    --neon-yellow: #f7df1e;
    --neon-glow: rgba(247, 223, 30, 0.5);
    --neon-dim: rgba(247, 223, 30, 0.2);
    --card-shadow: 0 0 20px rgba(247, 223, 30, 0.2);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color 0.3s, color 0.3s;
}

body {
    font-family: 'Segoe UI', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

/* Navbar */
nav {
    background: var(--bg-card);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px var(--neon-dim);
    border-bottom: 1px solid var(--neon-yellow);
}

.logo {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.logo a {
    color: var(--neon-yellow);
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    transition: text-shadow 0.3s;
}

.logo a:hover {
    text-shadow: 0 0 10px var(--neon-yellow);
}

.js-logo {
    position: relative;
    color: var(--neon-yellow);
    font-size: 2rem;
}

.glow-container {
    position: absolute;
    top: -10px;
    left: 50%;
    transform: translateX(-50%);
}

.glow {
    position: absolute;
    width: 2px;
    height: 10px;
    background: var(--neon-yellow);
    bottom: 100%;
    opacity: 0;
    filter: blur(1px);
}

.theme-toggle {
    background: none;
    border: none;
    color: var(--neon-yellow);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.5rem;
    transition: transform 0.3s;
}

.theme-toggle:hover {
    transform: rotate(180deg);
}

/* Main Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 7rem 2rem 2rem;
    position: relative;
    z-index: 1;
}

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

h1 {
    font-size: 2.5rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

h1 i {
    color: var(--neon-yellow);
    font-size: 2rem;
    animation: float 3s ease-in-out infinite;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.2rem;
}

/* Levels Grid */
.levels-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    padding: 1rem;
}

.level-card {
    background: var(--bg-card);
    border-radius: 15px;
    padding: 2rem;
    position: relative;
    overflow: hidden;
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
    border: 1px solid var(--neon-yellow);
}

.level-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 0 30px var(--neon-glow);
}

.card-glow {
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        var(--neon-glow),
        transparent
    );
    transition: 0.5s;
}

.level-card:hover .card-glow {
    left: 100%;
}

.level-number {
    background: var(--neon-yellow);
    color: var(--bg-primary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.2rem;
    margin-bottom: 1rem;
    box-shadow: 0 0 15px var(--neon-glow);
}

.level-card h2 {
    color: var(--neon-yellow);
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.level-card p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    line-height: 1.5;
}

.card-footer {
    display: flex;
    justify-content: center;
}

.play-button {
    background: transparent;
    color: var(--neon-yellow);
    border: 1px solid var(--neon-yellow);
    padding: 0.8rem 2rem;
    border-radius: 25px;
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s;
}

.play-button:hover {
    background: var(--neon-yellow);
    color: var(--bg-primary);
    box-shadow: 0 0 20px var(--neon-glow);
}

/* Particles */
.particles-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
}

.particle {
    position: absolute;
    background: var(--neon-yellow);
    border-radius: 50%;
    pointer-events: none;
    opacity: 0.3;
    animation: float 3s infinite ease-in-out;
}

/* Cursor Trail */
.cursor-trail {
    width: 10px;
    height: 10px;
    background: var(--neon-yellow);
    border-radius: 50%;
    position: fixed;
    pointer-events: none;
    opacity: 0;
    z-index: 10000;
    transition: opacity 0.3s;
    box-shadow: 0 0 10px var(--neon-yellow);
}

/* Animations */
@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

@keyframes glow {
    0% {
        height: 0;
        opacity: 0;
    }
    50% {
        height: 10px;
        opacity: 0.5;
    }
    100% {
        height: 0;
        opacity: 0;
        transform: translateY(-10px);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 6rem 1rem 1rem;
    }

    h1 {
        font-size: 2rem;
    }

    .levels-grid {
        grid-template-columns: 1fr;
    }

    .level-card {
        padding: 1.5rem;
    }
}