:root {
    --bg-color: #2c3e50;
    --text-color: #ecf0f1;
    --accent-color: #e74c3c;
    --success-color: #2ecc71;
}

body {
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    overflow: hidden;
    user-select: none;
}

#game-container {
    position: relative;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    border: 4px solid #34495e;
    border-radius: 8px;
}

canvas {
    background-color: var(--success-color);
    display: block;
}

#hud {
    display: none;
    position: absolute;
    top: 20px;
    left: 20px;
    background: rgba(0, 0, 0, 0.8);
    padding: 15px 20px;
    border-radius: 8px;
    pointer-events: none;
    border-left: 4px solid var(--accent-color);
    min-width: 150px;
}

#hud div {
    margin-bottom: 8px;
    font-size: 16px;
    font-weight: 600;
    letter-spacing: 1px;
}

.hud-value { 
    color: var(--success-color); 
    float: right; 
    margin-left: 15px; 
}

.controls-hint {
    font-size: 12px;
    color: #95a5a6;
    margin-top: 10px;
    text-transform: uppercase;
}

#end-screen {
    display: none;
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.85);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

#end-title { 
    margin: 0 0 20px 0; 
    font-size: 48px; 
    color: var(--accent-color); 
    text-transform: uppercase; 
}

#end-stats {
    margin-bottom: 30px; 
    font-size: 20px;
}

button {
    padding: 12px 30px;
    font-size: 18px;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.2s;
}

button:hover { 
    background: #c0392b; 
}