/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 50%, #87CEEB 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    overflow: hidden;
    margin: 0;
    padding: 20px;
}

#gameContainer {
    position: relative;
    border: 4px solid #2F4F4F;
    border-radius: 20px;
    box-shadow: 0 0 30px rgba(0, 0, 0, 0.5), inset 0 0 20px rgba(255, 255, 255, 0.1);
    background: linear-gradient(135deg, #87CEEB 0%, #98D8E8 100%);
    max-width: 90vw;
    max-height: 90vh;
}

#gameCanvas {
    display: block;
    border-radius: 16px;
    background: linear-gradient(to bottom, #87CEEB 0%, #98D8E8 60%, #90EE90 85%, #32CD32 100%);
}

/* Screen overlays */
.screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.8) 0%, rgba(30, 60, 114, 0.9) 100%);
    color: white;
    text-align: center;
    z-index: 10;
    backdrop-filter: blur(5px);
    border-radius: 16px;
}

.screen h1 {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    color: #FFD700;
    text-shadow: 3px 3px 6px rgba(0, 0, 0, 0.8);
    font-weight: bold;
    letter-spacing: 2px;
}

.screen p {
    font-size: 1.4rem;
    margin-bottom: 0.8rem;
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.7);
}

.controls {
    font-size: 1rem !important;
    color: #DDD !important;
    margin-top: 1rem !important;
}

.hidden {
    display: none !important;
}

/* Score display */
#scoreDisplay {
    position: absolute;
    top: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 5;
    font-size: 3rem;
    font-weight: bold;
    color: white;
    text-shadow: 3px 3px 6px rgba(0, 0, 0, 0.8);
    background: rgba(0, 0, 0, 0.3);
    padding: 10px 20px;
    border-radius: 15px;
    backdrop-filter: blur(10px);
}

/* Game over screen specific */
#gameOverScreen button {
    background: linear-gradient(135deg, #FFD700 0%, #FFA500 100%);
    border: none;
    padding: 20px 40px;
    font-size: 1.4rem;
    font-weight: bold;
    border-radius: 15px;
    cursor: pointer;
    margin-top: 1.5rem;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    text-transform: uppercase;
    letter-spacing: 1px;
}

#gameOverScreen button:hover {
    background: linear-gradient(135deg, #FFA500 0%, #FF8C00 100%);
    transform: translateY(-2px);
    box-shadow: 0 7px 20px rgba(0, 0, 0, 0.4);
}

#gameOverScreen button:active {
    transform: translateY(0) scale(0.98);
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.3);
}

/* Mobile controls */
#mobileControls {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 5;
}

#flapBtn {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.2) 0%, rgba(255, 215, 0, 0.3) 100%);
    border: 2px solid white;
    color: white;
    padding: 10px 20px;
    font-size: 0.9rem;
    font-weight: bold;
    border-radius: 8px;
    cursor: pointer;
    backdrop-filter: blur(15px);
    transition: all 0.3s ease;
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.2);
    text-transform: uppercase;
    letter-spacing: 1px;
}

#flapBtn:active {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.4) 0%, rgba(255, 215, 0, 0.5) 100%);
    transform: scale(0.95);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
}

/* Responsive design */
@media (max-width: 700px) {
    body {
        padding: 10px;
    }
    
    #gameContainer {
        border: 2px solid #2F4F4F;
        border-radius: 15px;
        width: 95vw;
        height: 85vh;
    }
    
    #gameCanvas {
        width: 100%;
        height: 100%;
        border-radius: 13px;
    }
    
    .screen h1 {
        font-size: 3rem;
    }
    
    .screen p {
        font-size: 1.2rem;
    }
    
    #scoreDisplay {
        font-size: 2rem;
        top: 20px;
        padding: 8px 16px;
    }
}

@media (max-width: 480px) {
    #gameContainer {
        border: none;
        border-radius: 0;
        width: 100vw;
        height: 100vh;
    }
    
    #gameCanvas {
        width: 100vw;
        height: 100vh;
        border-radius: 0;
    }
    
    .screen h1 {
        font-size: 2.5rem;
    }
    
    .screen p {
        font-size: 1rem;
    }
    
    #scoreDisplay {
        font-size: 1.8rem;
        top: 30px;
        padding: 6px 12px;
    }
}

@media (max-height: 600px) {
    .screen h1 {
        font-size: 2rem;
        margin-bottom: 0.5rem;
    }
    
    .screen p {
        font-size: 1rem;
        margin-bottom: 0.3rem;
    }
}

/* Animation for smooth transitions */
.screen {
    transition: opacity 0.3s ease;
}

/* Pulse animation for start screen */
@keyframes pulse {
    0%, 100% { 
        opacity: 1; 
        transform: scale(1);
    }
    50% { 
        opacity: 0.7; 
        transform: scale(1.05);
    }
}

@keyframes glow {
    0%, 100% {
        text-shadow: 3px 3px 6px rgba(0, 0, 0, 0.8), 0 0 20px rgba(255, 215, 0, 0.5);
    }
    50% {
        text-shadow: 3px 3px 6px rgba(0, 0, 0, 0.8), 0 0 30px rgba(255, 215, 0, 0.8);
    }
}

#startScreen p:first-of-type {
    animation: pulse 2s infinite;
}

#startScreen h1 {
    animation: glow 3s infinite;
}