:root {
    --neon-blue: #00f3ff;
    --neon-purple: #bc13fe;
    --neon-pink: #ff00ff;
    --bg-dark: #050505;
    --text-main: #ffffff;
    --glass-bg: rgba(255, 255, 255, 0.05);
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: 'Exo 2', sans-serif;
    overflow: hidden;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

#game-container {
    position: relative;
    width: 100vw;
    height: 100vh;
    box-shadow: 0 0 50px rgba(188, 19, 254, 0.2);
    background:
        radial-gradient(circle at center, #1a0b2e 0%, #050505 100%),
        url('https://www.transparenttextures.com/patterns/stardust.png');
    /* Subtle stardust texture */
    background-color: #020205;
    touch-action: none;
}

#gameCanvas {
    display: block;
    width: 100%;
    height: 100%;
}

/* --- HUD --- */
#hud {
    position: absolute;
    top: 20px;
    left: 20px;
    right: 20px;
    display: flex;
    justify-content: space-between;
    pointer-events: none;
    z-index: 10;
}

.stat-box {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(0, 243, 255, 0.3);
    padding: 10px 20px;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.label {
    font-family: 'Orbitron', sans-serif;
    font-size: 10px;
    letter-spacing: 2px;
    color: var(--neon-blue);
    margin-bottom: 5px;
}

#score-val,
#high-score-val {
    font-family: 'Orbitron', sans-serif;
    font-weight: 900;
    font-size: 24px;
    text-shadow: 0 0 10px var(--neon-blue);
}

#powerup-notice {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    font-family: 'Orbitron', sans-serif;
    font-size: 20px;
    color: var(--neon-blue);
    text-shadow: 0 0 15px var(--neon-blue);
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s;
}

#powerup-notice.active {
    opacity: 1;
    animation: bounce 0.5s ease-in-out infinite alternate;
}

@keyframes bounce {
    from {
        transform: translateX(-50%) translateY(0);
    }

    to {
        transform: translateX(-50%) translateY(-10px);
    }
}

.health-bar-container {
    width: 150px;
    height: 10px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 5px;
    overflow: hidden;
    margin-top: 5px;
    border: 1px solid rgba(255, 0, 255, 0.3);
}

#health-bar-fill {
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, var(--neon-purple), var(--neon-pink));
    box-shadow: 0 0 15px var(--neon-pink);
    transition: width 0.3s ease;
}

/* --- OVERLAYS --- */
#overlay,
#game-over {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 20;
    transition: opacity 0.5s ease;
}

.hidden {
    opacity: 0;
    pointer-events: none;
}

#overlay.active {
    opacity: 1;
}

.content {
    text-align: center;
    max-width: 600px;
    padding: 40px;
    border-radius: 20px;
    border: 1px solid rgba(188, 19, 254, 0.5);
    background: rgba(10, 5, 20, 0.8);
    box-shadow: 0 0 30px rgba(188, 19, 254, 0.3);
}

h1 {
    font-family: 'Orbitron', sans-serif;
    font-size: 80px;
    font-weight: 900;
    margin-bottom: 10px;
    letter-spacing: 5px;
    background: linear-gradient(to right, var(--neon-blue), var(--neon-purple));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    text-transform: uppercase;
}

.subtitle {
    font-family: 'Orbitron', sans-serif;
    letter-spacing: 4px;
    color: var(--neon-blue);
    margin-bottom: 40px;
    opacity: 0.8;
}

.instructions {
    margin-bottom: 40px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.control-item {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.7);
}

.key {
    background: rgba(255, 255, 255, 0.1);
    padding: 4px 10px;
    border-radius: 4px;
    border: 1px solid var(--neon-blue);
    color: var(--neon-blue);
    font-family: 'Orbitron', sans-serif;
    font-size: 14px;
}

button {
    padding: 15px 40px;
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    font-size: 18px;
    letter-spacing: 2px;
    background: transparent;
    border: 2px solid var(--neon-blue);
    color: var(--neon-blue);
    cursor: pointer;
    transition: all 0.3s ease;
    border-radius: 5px;
    text-transform: uppercase;
    position: relative;
    overflow: hidden;
}

button:hover {
    background: var(--neon-blue);
    color: var(--bg-dark);
    box-shadow: 0 0 30px var(--neon-blue);
}

.danger-text {
    font-family: 'Orbitron', sans-serif;
    font-size: 50px;
    color: var(--neon-pink);
    text-shadow: 0 0 20px var(--neon-pink);
    margin-bottom: 20px;
}

.final-stats {
    font-size: 24px;
    margin-bottom: 40px;
}

#final-score {
    color: var(--neon-blue);
    font-weight: 700;
}

/* --- MOBILE RESPONSIVENESS --- */
@media (max-width: 768px) {
    #hud {
        top: 10px;
        left: 10px;
        right: 10px;
        gap: 5px;
        flex-wrap: wrap;
    }

    .stat-box {
        padding: 5px 12px;
        flex: 1 1 auto;
        min-width: 80px;
    }

    #score-val,
    #high-score-val {
        font-size: 16px;
    }

    #level-val {
        font-size: 16px;
    }

    .label {
        font-size: 8px;
    }

    h1 {
        font-size: 40px;
    }

    .subtitle {
        font-size: 14px;
    }

    .content {
        padding: 20px;
        width: 90%;
    }

    .health-bar-container {
        width: 100px;
    }
}

/* Animations */
@keyframes pulse {
    0% {
        opacity: 0.6;
    }

    50% {
        opacity: 1;
    }

    100% {
        opacity: 0.6;
    }
}

.subtitle {
    animation: pulse 2s infinite ease-in-out;
}

@keyframes shake {
    0% {
        transform: translate(1px, 1px) rotate(0deg);
    }

    10% {
        transform: translate(-1px, -2px) rotate(-1deg);
    }

    20% {
        transform: translate(-3px, 0px) rotate(1deg);
    }

    30% {
        transform: translate(3px, 2px) rotate(0deg);
    }

    40% {
        transform: translate(1px, -1px) rotate(1deg);
    }

    50% {
        transform: translate(-1px, 2px) rotate(-1deg);
    }

    60% {
        transform: translate(-3px, 1px) rotate(0deg);
    }

    70% {
        transform: translate(3px, 1px) rotate(-1deg);
    }

    80% {
        transform: translate(-1px, -1px) rotate(1deg);
    }

    90% {
        transform: translate(1px, 2px) rotate(0deg);
    }

    100% {
        transform: translate(1px, -2px) rotate(-1deg);
    }
}

.shake {
    animation: shake 0.2s;
    animation-iteration-count: infinite;
}