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

:root {
    --bg-dark: #0a0a15;
    --bg-medium: #151525;
    --accent-red: #FF3366;
    --accent-blue: #00D4FF;
    --accent-gold: #FFD700;
    --accent-neon: #39FF14;
    --text-light: #ffffff;
    --text-dim: #888899;
}

body {
    font-family: 'Russo One', sans-serif;
    background: var(--bg-dark);
    color: var(--text-light);
    min-height: 100vh;
    overflow: hidden;
}

.screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.screen.active {
    display: flex;
}

/* Flash Warning Screen */
#warning-screen {
    background: linear-gradient(135deg, #0a0a15 0%, #1a0a0a 50%, #0a0a15 100%);
}

.warning-content {
    text-align: center;
    max-width: 500px;
    padding: 40px;
    animation: fadeInUp 0.5s ease-out;
}

.warning-icon {
    font-size: 5rem;
    margin-bottom: 20px;
    animation: warningPulse 1s ease-in-out infinite;
}

@keyframes warningPulse {
    0%, 100% { 
        transform: scale(1);
        filter: drop-shadow(0 0 20px #FFD700);
    }
    50% { 
        transform: scale(1.1);
        filter: drop-shadow(0 0 40px #FF6B00);
    }
}

.warning-title {
    font-family: 'Bangers', cursive;
    font-size: 3rem;
    color: #FF6B00;
    text-shadow: 0 0 20px #FF6B00;
    margin-bottom: 30px;
    letter-spacing: 0.1em;
}

.warning-text {
    font-size: 1rem;
    color: #ccc;
    line-height: 1.6;
    margin-bottom: 15px;
}

#accept-warning-btn {
    margin-top: 30px;
    background: linear-gradient(135deg, #FF6B00 0%, #FF3366 100%);
}

/* Bye Message */
.bye-message {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    font-family: 'Russo One', sans-serif;
    font-size: 1rem;
    color: rgba(150, 150, 180, 0.6);
    letter-spacing: 0.2em;
    z-index: 1;
}

/* Flash Overlay for Game */
.flash-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 5;
    opacity: 0;
    mix-blend-mode: screen;
}

/* Menu Screen */
#menu-screen {
    background: linear-gradient(135deg, #0a0a15 0%, #1a1a2e 50%, #0f0f1a 100%);
    position: relative;
}

.menu-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 80%, rgba(255, 51, 102, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(0, 212, 255, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(255, 215, 0, 0.05) 0%, transparent 70%);
    pointer-events: none;
}

.title {
    font-family: 'Bangers', cursive;
    font-size: 6rem;
    letter-spacing: 0.15em;
    text-shadow: 
        0 0 20px var(--accent-red),
        0 0 40px var(--accent-red),
        4px 4px 0 #000;
    color: var(--text-light);
    animation: titlePulse 2s ease-in-out infinite;
    z-index: 1;
}

.subtitle {
    font-family: 'Bangers', cursive;
    font-size: 3rem;
    letter-spacing: 0.5em;
    color: var(--accent-gold);
    text-shadow: 
        0 0 10px var(--accent-gold),
        2px 2px 0 #000;
    margin-top: -10px;
    margin-bottom: 40px;
    z-index: 1;
}

@keyframes titlePulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.02); }
}

.character-select {
    background: rgba(20, 20, 35, 0.9);
    border: 2px solid rgba(255, 215, 0, 0.3);
    border-radius: 20px;
    padding: 30px 50px;
    margin-bottom: 30px;
    z-index: 1;
}

.character-select h3 {
    text-align: center;
    color: var(--accent-gold);
    margin-bottom: 25px;
    font-size: 1.2rem;
    letter-spacing: 0.2em;
}

.characters {
    display: flex;
    gap: 20px;
}

.character {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 15px;
    border: 3px solid transparent;
    border-radius: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
    background: rgba(0, 0, 0, 0.3);
}

.character:hover {
    transform: translateY(-5px);
    border-color: rgba(255, 255, 255, 0.3);
    background: rgba(255, 255, 255, 0.05);
}

.character.selected {
    border-color: var(--accent-gold);
    background: rgba(255, 215, 0, 0.1);
    box-shadow: 0 0 30px rgba(255, 215, 0, 0.3);
    transform: translateY(-5px) scale(1.05);
}

.char-preview {
    margin-bottom: 10px;
}

.character span {
    font-size: 0.8rem;
    letter-spacing: 0.1em;
    color: var(--text-dim);
    transition: color 0.3s;
}

.character:hover span,
.character.selected span {
    color: var(--text-light);
}

.controls-info {
    background: rgba(20, 20, 35, 0.8);
    border: 1px solid rgba(0, 212, 255, 0.3);
    border-radius: 15px;
    padding: 20px 40px;
    margin-bottom: 30px;
    z-index: 1;
}

.controls-info h4 {
    text-align: center;
    color: var(--accent-blue);
    margin-bottom: 15px;
    font-size: 0.9rem;
    letter-spacing: 0.3em;
}

.control-keys {
    display: flex;
    gap: 40px;
    justify-content: center;
}

.key-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.key {
    background: linear-gradient(180deg, #3a3a4a 0%, #2a2a3a 100%);
    border: 2px solid #4a4a5a;
    border-radius: 8px;
    padding: 8px 15px;
    font-size: 0.9rem;
    color: var(--text-light);
    box-shadow: 0 4px 0 #1a1a2a;
    display: inline-block;
    min-width: 45px;
    text-align: center;
}

.key-label {
    font-size: 0.7rem;
    color: var(--text-dim);
    letter-spacing: 0.1em;
}

.btn {
    font-family: 'Russo One', sans-serif;
    font-size: 1.3rem;
    padding: 15px 50px;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    letter-spacing: 0.1em;
    transition: all 0.3s ease;
    text-transform: uppercase;
    z-index: 1;
}

.btn:not(:disabled) {
    background: linear-gradient(135deg, var(--accent-red) 0%, #cc2952 100%);
    color: white;
    box-shadow: 0 5px 20px rgba(255, 51, 102, 0.4);
}

.btn:not(:disabled):hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(255, 51, 102, 0.6);
}

.btn:disabled {
    background: #333;
    color: #666;
    cursor: not-allowed;
}

.btn.secondary {
    background: transparent;
    border: 2px solid var(--accent-blue);
    color: var(--accent-blue);
    box-shadow: none;
    margin-top: 15px;
}

.btn.secondary:hover {
    background: rgba(0, 212, 255, 0.1);
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
}

/* Game Screen */
#game-screen {
    background: #0a0a15;
}

#game-canvas {
    display: block;
}

.game-hud {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 40px;
    background: linear-gradient(180deg, rgba(0, 0, 0, 0.8) 0%, transparent 100%);
    z-index: 10;
}

.player-info {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.player-1-info {
    align-items: flex-start;
}

.player-2-info {
    align-items: flex-end;
}

.player-name {
    font-size: 1rem;
    letter-spacing: 0.2em;
    color: var(--text-dim);
}

.hearts {
    display: flex;
    gap: 8px;
}

.player-2-info .hearts {
    flex-direction: row-reverse;
}

.heart {
    width: 30px;
    height: 30px;
    position: relative;
}

.heart::before {
    content: '❤';
    font-size: 28px;
    color: var(--accent-red);
    text-shadow: 0 0 10px var(--accent-red);
    transition: all 0.3s;
}

.heart.lost::before {
    color: #333;
    text-shadow: none;
    opacity: 0.5;
}

.vs {
    font-family: 'Bangers', cursive;
    font-size: 2rem;
    color: var(--accent-gold);
    text-shadow: 0 0 20px var(--accent-gold);
}

/* Level Display */
.level-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    background: rgba(20, 20, 40, 0.8);
    padding: 10px 25px;
    border-radius: 10px;
    border: 2px solid rgba(255, 215, 0, 0.4);
}

.level-num {
    font-family: 'Bangers', cursive;
    font-size: 1.8rem;
    color: var(--accent-gold);
    text-shadow: 0 0 15px var(--accent-gold);
    letter-spacing: 0.1em;
}

.level-name {
    font-size: 0.75rem;
    color: var(--text-dim);
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

/* Game Over Screen */
#gameover-screen {
    background: rgba(10, 10, 21, 0.95);
}

.gameover-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 50% 50%, rgba(255, 51, 102, 0.2) 0%, transparent 60%);
    pointer-events: none;
}

.gameover-content {
    text-align: center;
    z-index: 1;
    animation: fadeInUp 0.5s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

#gameover-title {
    font-family: 'Bangers', cursive;
    font-size: 5rem;
    letter-spacing: 0.1em;
    margin-bottom: 20px;
}

#gameover-title.defeat {
    color: var(--accent-red);
    text-shadow: 0 0 30px var(--accent-red);
}

#gameover-title.victory {
    color: var(--accent-neon);
    text-shadow: 0 0 30px var(--accent-neon);
}

#gameover-title.champion {
    color: var(--accent-gold);
    text-shadow: 
        0 0 30px var(--accent-gold),
        0 0 60px var(--accent-gold);
    animation: championPulse 1s ease-in-out infinite;
}

@keyframes championPulse {
    0%, 100% { 
        transform: scale(1);
        text-shadow: 0 0 30px var(--accent-gold), 0 0 60px var(--accent-gold);
    }
    50% { 
        transform: scale(1.05);
        text-shadow: 0 0 50px var(--accent-gold), 0 0 100px var(--accent-gold);
    }
}

#gameover-message {
    font-size: 1.2rem;
    color: var(--text-dim);
    margin-bottom: 40px;
}

/* Next Level Button */
.btn.next-level {
    background: linear-gradient(135deg, var(--accent-neon) 0%, #2ecc71 100%);
    color: #000;
    font-weight: bold;
    box-shadow: 0 5px 20px rgba(57, 255, 20, 0.4);
    margin-bottom: 10px;
}

.btn.next-level:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(57, 255, 20, 0.6);
}

#next-level-btn {
    display: none;
}

/* Mobile adjustments */
@media (max-width: 768px) {
    .title {
        font-size: 3.5rem;
    }
    
    .subtitle {
        font-size: 1.8rem;
    }
    
    .characters {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .character-select {
        padding: 20px;
    }
    
    .control-keys {
        gap: 20px;
    }
    
    .game-hud {
        padding: 15px 20px;
    }
    
    .heart {
        width: 25px;
        height: 25px;
    }
    
    .heart::before {
        font-size: 22px;
    }
}