:root {
    --neon-green: #00ff9d;
    --neon-red: #ff2a6d;
    --neon-yellow: #f9f002;
    --neon-blue: #05d9e8;
    --dark-bg: #0d0221;
    --darker-bg: #05010f;
    --text-glow: 0 0 10px currentColor;
}

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

body {
    font-family: 'Orbitron', sans-serif;
    background-color: var(--dark-bg);
    color: white;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.game-container {
    width: 100%;
    max-width: 500px;
    padding: 20px;
    text-align: center;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: 2px;
    color: white;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.7);
}

h1 span {
    color: var(--neon-blue);
    text-shadow: 0 0 10px var(--neon-blue);
}

.level-display {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.level-display span {
    font-size: 0.9rem;
    color: var(--neon-blue);
    margin-bottom: 5px;
}

.level-number {
    font-size: 2rem;
    font-weight: 500;
    color: var(--neon-green);
    text-shadow: var(--text-glow);
}

.game-board {
    position: relative;
    width: 100%;
    aspect-ratio: 1/1;
    margin: 0 auto;
    border-radius: 50%;
    overflow: hidden;
    box-shadow: 0 0 30px rgba(5, 217, 232, 0.3);
}

.quadrant {
    position: absolute;
    width: 50%;
    height: 50%;
    opacity: 0.3;
    transition: all 0.2s ease;
    cursor: pointer;
}

.quadrant:hover {
    opacity: 0.5;
}

.top-left {
    top: 0;
    left: 0;
    background-color: var(--neon-green);
    border-top-left-radius: 100%;
}

.top-right {
    top: 0;
    right: 0;
    background-color: var(--neon-red);
    border-top-right-radius: 100%;
}

.bottom-left {
    bottom: 0;
    left: 0;
    background-color: var(--neon-yellow);
    border-bottom-left-radius: 100%;
}

.bottom-right {
    bottom: 0;
    right: 0;
    background-color: var(--neon-blue);
    border-bottom-right-radius: 100%;
}

.center-circle {
    position: absolute;
    width: 30%;
    height: 30%;
    background-color: var(--darker-bg);
    border-radius: 50%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.8);
    z-index: 10;
}

.start-btn {
    color: white;
    font-size: 1.2rem;
    font-weight: 500;
    cursor: pointer;
    padding: 10px 20px;
    border-radius: 50px;
    transition: all 0.3s ease;
}

.start-btn:hover {
    color: var(--neon-green);
    text-shadow: var(--text-glow);
}

.message {
    margin-top: 20px;
    font-family: 'Roboto', sans-serif;
    font-weight: 300;
    color: rgba(255, 255, 255, 0.7);
    font-size: 1.1rem;
}

/* Active states */
.flash {
    opacity: 1 !important;
    box-shadow: 0 0 30px currentColor;
}

.userflash {
    opacity: 0.8 !important;
    box-shadow: 0 0 20px currentColor;
}

/* Game over effect */
.game-over {
    animation: gameOverFlash 0.5s alternate 3;
}

.game-over {
    background-color: var(--neon-red) !important;
}

@keyframes gameOverFlash {
    from { background-color: var(--dark-bg); }
    to { background-color: var(--neon-red); }
}

/* Responsive */
@media (max-width: 600px) {
    h1 {
        font-size: 2rem;
    }
    
    .level-number {
        font-size: 1.5rem;
    }
    
    .start-btn {
        font-size: 1rem;
    }
    
    .message {
        font-size: 1rem;
    }
}