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

:root {
    --primary-color: #0cf;
    --secondary-color: #f70;
    --accent-color: #0fc;
    --text-color: #fff;
    --bg-dark: #000;
    --bg-semi-transparent: rgba(0, 0, 0, 0.8);
    --footer-bg: rgba(10, 10, 20, 0.7);
}

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: 'Arial', sans-serif;
    background: var(--bg-dark);
    color: var(--text-color);
}

/* Game Container */
#game-container {
    position: relative;
    width: 100%;
    height: calc(100% - 40px); /* Account for footer */
    overflow: hidden;
}

/* Canvas */
#canvas {
    background: url('images/space-background.jpg') no-repeat center center;
    background-size: cover;
    width: 100%;
    height: 100%;
    cursor: default;
}

#canvas.playing {
    cursor: url('images/crosshair.png') 25 25, auto !important;
}

/* HUD Elements */
#hud {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    padding: 15px;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    pointer-events: none;
}

#score-container {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

#score {
    font-size: 3rem;
    font-weight: bold;
    text-shadow: 0 0 10px var(--primary-color), 0 0 20px var(--primary-color);
}

#high-score {
    font-size: 2rem;
    opacity: 10;
    text-shadow: 0 0 5px var(--accent-color);
}

#sound-controls {
    pointer-events: auto;
}

#sound-toggle {
    background: rgba(0, 0, 0, 0.5);
    border: 2px solid var(--primary-color);
    color: var(--text-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    font-size: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
}

#sound-toggle:hover {
    background: rgba(0, 0, 0, 0.8);
    box-shadow: 0 0 15px var(--primary-color);
}

/* Overlay Screens */
.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: var(--bg-semi-transparent);
    z-index: 10;
    text-align: center;
    padding: 20px;
}

.overlay h1 {
    font-size: 4rem;
    margin-bottom: 30px;
    color: var(--primary-color);
    text-shadow: 0 0 10px var(--accent-color), 0 0 20px var(--accent-color);
}

.overlay p {
    font-size: 1.5rem;
    margin-bottom: 40px;
    max-width: 600px;
}

.overlay button {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: var(--bg-dark);
    border: none;
    padding: 15px 40px;
    font-size: 1.5rem;
    border-radius: 30px;
    cursor: pointer;
    margin: 20px 0;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 2px;
    box-shadow: 0 0 20px rgba(12, 255, 204, 0.5);
    transition: all 0.3s ease;
}

.overlay button:hover {
    transform: scale(1.05);
    box-shadow: 0 0 30px rgba(12, 255, 204, 0.8);
}

#final-score, #record-score, #new-record {
    font-size: 2rem;
    margin: 10px 0;
}

#new-record {
    font-size: 5rem;
    color: var(--secondary-color);
    text-shadow: 0 0 20px var(--secondary-color);
    margin: 30px 0;
}

.hidden {
    display: none;
}

/* Fireworks Animation */
.fireworks {
    position: absolute;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
}

/* Footer */
footer {
    width: 100%;
    height: 40px;
    background: var(--footer-bg);
    display: flex;
    justify-content: center;
    align-items: center;
    border-top: 1px solid rgba(12, 255, 204, 0.3);
}

footer p {
    color: var(--text-color);
    font-size: 1rem;
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
    transition: all 0.3s ease;
}

footer a:hover {
    color: var(--accent-color);
    text-shadow: 0 0 5px var(--accent-color);
}

/* Animations */
@keyframes laser-beam {
    0% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.2); opacity: 0.8; }
    100% { transform: scale(1); opacity: 1; }
}

@keyframes asteroid-spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes planet-glow {
    0% { filter: drop-shadow(0 0 15px rgba(0, 255, 255, 0.5)); }
    50% { filter: drop-shadow(0 0 25px rgba(0, 255, 255, 0.8)); }
    100% { filter: drop-shadow(0 0 15px rgba(0, 255, 255, 0.5)); }
}

@keyframes explosion-flash {
    0% { opacity: 1; transform: scale(0.3); }
    50% { opacity: 0.8; transform: scale(1.2); }
    100% { opacity: 0; transform: scale(2); }
}

@keyframes floating {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
    100% { transform: translateY(0px); }
}

@keyframes celebrate {
    0% { transform: scale(1) rotate(0deg); }
    25% { transform: scale(1.2) rotate(-5deg); }
    75% { transform: scale(1.2) rotate(5deg); }
}

/* Enhanced Overlay Animations */
.overlay h1 {
    animation: floating 3s ease-in-out infinite;
}

.high-score-animation {
    animation: celebrate 1s ease-in-out;
}

/* Enhanced Game Elements */
.laser-beam {
    animation: laser-beam 0.3s linear;
    filter: drop-shadow(0 0 10px #0ff);
}

.asteroid {
    animation: asteroid-spin 20s linear infinite;
}

.planet-glow {
    animation: planet-glow 3s ease-in-out infinite;
}

.explosion {
    animation: explosion-flash 0.5s ease-out forwards;
}

/* Particle Effects */
.particle {
    position: absolute;
    pointer-events: none;
    background: radial-gradient(circle, rgba(255,255,255,1) 0%, rgba(255,255,255,0) 70%);
}

/* High Score Celebration */
.celebration-text {
    font-size: 4rem;
    color: gold;
    text-shadow: 0 0 20px rgba(255, 215, 0, 0.8);
    animation: floating 2s ease-in-out infinite;
}

.firework-particle {
    position: absolute;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    pointer-events: none;
}

/* Planet Destruction Effects */
@keyframes fragment-explosion {
    0% { 
        transform: translate(-50%, -50%) scale(1) rotate(0deg);
        filter: brightness(2);
    }
    100% { 
        transform: translate(var(--tx), var(--ty)) scale(0.1) rotate(var(--rot));
        filter: brightness(1);
        opacity: 0;
    }
}

@keyframes fragment-trail {
    0% { 
        transform: scaleX(1) rotate(var(--angle));
        opacity: 0.8;
    }
    100% { 
        transform: scaleX(0.1) rotate(var(--angle));
        opacity: 0;
    }
}

.planet-fragment {
    position: absolute;
    pointer-events: none;
    transform-origin: center;
    z-index: 3;
}

.fragment-trail {
    position: absolute;
    pointer-events: none;
    transform-origin: center;
    z-index: 2;
    filter: brightness(1.5);
}

/* Screen Shake */
@keyframes screen-shake {
    0%, 100% { transform: translate(0, 0); }
    25% { transform: translate(var(--shake-x), var(--shake-y)); }
    75% { transform: translate(calc(var(--shake-x) * -1), calc(var(--shake-y) * -1)); }
}

.screen-shake {
    animation: screen-shake 0.1s ease-in-out;
}

/* Responsive Design */
@media (max-width: 768px) {
    #score {
        font-size: 2rem;
    }
    
    #high-score {
        font-size: 0.9rem;
    }
    
    .overlay h1 {
        font-size: 3rem;
    }
    
    .overlay p {
        font-size: 1.2rem;
    }
    
    .overlay button {
        padding: 12px 30px;
        font-size: 1.2rem;
    }
    
    #new-record {
        font-size: 3.5rem;
    }
}

@media (max-width: 480px) {
    #hud {
        padding: 10px;
    }
    
    #score {
        font-size: 1.5rem;
    }
    
    #high-score {
        font-size: 0.8rem;
    }
    
    #sound-toggle {
        width: 30px;
        height: 30px;
        font-size: 16px;
    }
    
    .overlay h1 {
        font-size: 2rem;
    }
    
    .overlay p {
        font-size: 1rem;
    }
    
    .overlay button {
        padding: 10px 25px;
        font-size: 1rem;
    }
    
    #final-score, #record-score {
        font-size: 1.5rem;
    }
    
    #new-record {
        font-size: 2.5rem;
    }
    
    footer p {
        font-size: 0.9rem;
    }
}

/* Score Animations */
@keyframes high-score-pulse {
    0% { transform: scale(1); color: var(--text-color); }
    50% { transform: scale(1.2); color: gold; }
    100% { transform: scale(1); color: var(--text-color); }
}

.high-score-pulse {
    animation: high-score-pulse 0.5s ease-in-out;
}

/* Weapon Effects */
@keyframes muzzle-flash {
    0% { transform: scale(0.5); opacity: 1; filter: brightness(1.5); }
    50% { transform: scale(1.5); opacity: 0.8; filter: brightness(2); }
    100% { transform: scale(0.5); opacity: 0; filter: brightness(1.5); }
}

@keyframes bullet-trail {
    0% { 
        opacity: 0.8;
        transform: scaleY(0.3);
    }
    100% { 
        opacity: 0;
        transform: scaleY(1);
    }
}

.muzzle-flash {
    position: absolute;
    background: radial-gradient(circle, rgba(255,200,100,1) 0%, rgba(255,160,50,0.8) 50%, rgba(255,100,0,0) 100%);
    border-radius: 50%;
    pointer-events: none;
    z-index: 2;
    animation: muzzle-flash 0.15s ease-out forwards;
}

.bullet-trail {
    position: absolute;
    background: linear-gradient(to top, rgba(0,255,255,0) 0%, rgba(0,255,255,0.4) 50%, rgba(0,255,255,0) 100%);
    pointer-events: none;
    transform-origin: top;
    z-index: 1;
    animation: bullet-trail 0.2s ease-out forwards;
}