/* Basic Reset & Font */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Poppins', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: #1a2a3a; /* Dark Blue background */
    color: #e0e0e0; /* Light grey text */
    overflow: hidden; /* Prevent scrollbars if content overflows slightly */
}

/* Game Container */
.game-container {
    text-align: center;
    background-color: #2a3f54; /* Slightly lighter container background */
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.4);
}

h1 {
    color: #4CAF50; /* Vibrant Green Title */
    margin-bottom: 15px;
    font-weight: 600;
    letter-spacing: 2px;
}

/* Score Board */
.score-board {
    font-size: 1.4em;
    margin-bottom: 20px;
    color: #ffffff;
}

#score {
    font-weight: 600;
    color: #FFD700; /* Gold color for score */
}

/* Canvas Wrapper & Shadow Effect */
.canvas-wrapper {
    position: relative; /* Needed for overlay positioning */
    display: inline-block; /* Fit content size */
    /* The 3D Shadow Effect */
    box-shadow: 10px 10px 25px rgba(0, 0, 0, 0.5),
               -5px -5px 15px rgba(255, 255, 255, 0.05); /* Subtle inner top-left highlight */
    border-radius: 8px; /* Match canvas rounding if any (though canvas itself is sharp) */
    margin-bottom: 20px;
}

/* Game Canvas */
#gameCanvas {
    display: block; /* Remove extra space below canvas */
    background-color: #0d1b2a; /* Very Dark Blue Canvas Background */
    border: 3px solid #4a6f8a; /* Border color */
    border-radius: 5px; /* Slightly rounded corners */
}

/* Game Over Screen Overlay */
.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(26, 42, 58, 0.85); /* Semi-transparent overlay */
    display: none; /* Hidden by default */
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: white;
    border-radius: 5px; /* Match canvas rounding */
    backdrop-filter: blur(3px); /* Optional: Blur effect */
}

.overlay h2 {
    font-size: 2.5em;
    margin-bottom: 15px;
    color: #FF6347; /* Tomato Red for Game Over */
}

.overlay p {
    font-size: 1.5em;
    margin-bottom: 25px;
}

#finalScore {
    font-weight: 600;
    color: #FFD700; /* Gold */
}

/* Restart Button Styling */
#restartButton {
    padding: 12px 25px;
    font-size: 1.1em;
    font-weight: 600;
    color: #ffffff;
    background-color: #4CAF50; /* Green Button */
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.1s ease;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

#restartButton:hover {
    background-color: #45a049; /* Darker Green on hover */
}

#restartButton:active {
    transform: scale(0.98); /* Slight press effect */
}

/* Controls Info Text */
.controls-info {
    margin-top: 10px;
    font-size: 0.9em;
    color: #a0b0c0; /* Lighter grey */
}