:root {
    --neon-accent: #00ffcc;
    --neon-danger: #ff4444;
    --bg-dark: #050505;
    --main-bg: rgba(255, 255, 255, 0.05);
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

body, html {
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: var(--bg-dark);
    font-family: 'Segoe UI', system-ui, sans-serif;
    color: white;
}

#myCanvas {
    display: block;
    width: 100vw;
    height: 100vh;
    image-rendering: pixelated;
}

.game-screen {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -55%);
    z-index: 10;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 320px;
    padding: 3rem;
    text-align: center;
    border-radius: 20px;
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

#start_screen { background: var(--main-bg); }

#end_screen { 
    z-index: 20;
    background: rgba(201, 0, 55, 0.4);
    border-color: rgba(255, 0, 70, 0.3);
}

#win_screen { 
    z-index: 20;
    background: rgba(0, 255, 204, 0.1);
    border-color: var(--neon-accent);
}

h1 {
    font-size: 3.5rem;
    letter-spacing: 8px;
    margin-bottom: 2rem;
    color: var(--neon-accent);
    text-shadow: 0 0 15px var(--neon-accent);
    text-transform: uppercase;
}

#end_screen h1 { 
    color: var(--neon-danger); 
    text-shadow: 0 0 15px var(--neon-danger);
}

#instructions {
    max-width: 400px;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    font-size: 1rem;
    line-height: 1.6;
    color: #ccc;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

#instructions strong { color: var(--neon-accent); }

#controls {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    width: 100%;
    margin-bottom: 2.5rem;
}

.control-group {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 18px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 10px;
}

kbd {
    padding: 4px 8px;
    font-family: monospace;
    font-size: 0.85rem;
    color: var(--neon-accent);
    background: #222;
    border: 1px solid #444;
    border-radius: 4px;
    box-shadow: 0 2px 0 #000;
}

.action {
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: #888;
}

input[type=range] {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    background: #222;
    border-radius: 5px;
    margin: 10px 0;
    outline: none;
}

input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: var(--neon-accent);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 10px var(--neon-accent);
}

.button-row {
    display: flex;
    gap: 1rem;
    width: 100%;
}

.mode-button, .menu-button {
    flex: 1;
    padding: 16px 24px;
    font-size: 1rem;
    font-weight: bold;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    text-transform: uppercase;
    transition: var(--transition);
}

.mode-button:active, .menu-button:active { transform: scale(0.96); }

#easy_button, #win_retry_button {
    color: var(--bg-dark);
    background: var(--neon-accent);
}

#easy_button:hover, #win_retry_button:hover {
    background: #fff;
    box-shadow: 0 0 25px var(--neon-accent);
    transform: translateY(-3px) scale(1.02);
}

#hard_button, #retry_button {
    color: white;
    background: transparent;
    border: 2px solid var(--neon-danger);
}

#hard_button:hover, #retry_button:hover {
    background: var(--neon-danger);
    color: var(--bg-dark);
    box-shadow: 0 0 25px var(--neon-danger);
    transform: translateY(-3px) scale(1.02);
}

#win_button_container {
    margin-top: 1rem;
    gap: 1.5rem;
}