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

body {
    background-color: #0f172a; /* Dark slate background */
    color: #fff;
    font-family: 'Press Start 2P', cursive;
    overflow: hidden; /* Hide scrollbars for the canvas */
    height: 100vh;
    width: 100vw;
    display: flex;
    justify-content: center;
    align-items: center;
}

#gameCanvas {
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1; /* Below the UI layer */
}

#ui-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none; /* Let clicks pass through to canvas if needed, though buttons need pointer-events */
    z-index: 10;
}

#score-board {
    position: absolute;
    top: 20px;
    left: 20px;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(10px);
    border: 2px solid #38bdf8;
    box-shadow: 0 0 15px rgba(56, 189, 248, 0.5);
    padding: 15px 25px;
    border-radius: 8px;
    pointer-events: none;
}

#score-board h2 {
    color: #ffd700;
    font-size: 1.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px #b8860b;
}

#score-board h3 {
    color: #f87171;
    font-size: 1rem;
    text-shadow: 2px 2px #991b1b;
}

.overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(15px);
    border: 4px solid #f43f5e;
    box-shadow: 0 0 30px rgba(244, 63, 94, 0.6);
    padding: 40px;
    border-radius: 12px;
    text-align: center;
    pointer-events: auto; /* Buttons need to be clickable */
    transition: opacity 0.3s ease;
}

.overlay h1 {
    color: #f43f5e;
    font-size: 2.5rem;
    margin-bottom: 20px;
    text-shadow: 3px 3px #881337;
    line-height: 1.4;
}

.overlay p {
    font-size: 0.9rem;
    line-height: 1.8;
    margin-bottom: 15px;
    color: #e2e8f0;
}

.overlay h2 {
    color: #34d399;
    font-size: 1.8rem;
    margin: 25px 0;
    text-shadow: 2px 2px #065f46;
}

button {
    background-color: #38bdf8;
    color: #0f172a;
    font-family: inherit;
    font-size: 1.2rem;
    border: none;
    padding: 15px 30px;
    border-radius: 4px;
    cursor: pointer;
    box-shadow: 4px 4px 0px #0284c7;
    transition: all 0.1s ease;
    margin-top: 10px;
}

button:hover {
    background-color: #7dd3fc;
    transform: translate(-2px, -2px);
    box-shadow: 6px 6px 0px #0284c7;
}

button:active {
    transform: translate(2px, 2px);
    box-shadow: 2px 2px 0px #0284c7;
}

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

/* Screen shake animation for game over / hit */
@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 0.5s;
    animation-iteration-count: 1;
}