:root {
    --bg-color: #0d0d0d;
    --grid-color: #1a1a1a;
    --text-color: #e0e0e0;
    --neon-blue: #00ffff;
    --neon-pink: #ff00ff;
    --neon-green: #00ff00;
    --neon-yellow: #ffff00;
    --neon-orange: #ff8000;
    --neon-red: #ff0000;
    --neon-purple: #8000ff;
    --font-main: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-main);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    overflow: hidden;
    user-select: none;
}

#game-container {
    display: flex;
    gap: 20px;
    align-items: flex-start;
    padding: 20px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 255, 255, 0.1);
}

.panel {
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid #333;
    border-radius: 5px;
    padding: 10px;
    margin-bottom: 15px;
    text-align: center;
    width: 100px;
}

.panel h2 {
    margin: 0 0 5px 0;
    font-size: 14px;
    color: var(--neon-blue);
    text-transform: uppercase;
    letter-spacing: 1px;
}

#score-display, #highscore-display, #level-display, #lines-display {
    font-size: 20px;
    font-weight: bold;
    color: var(--text-color);
}

canvas {
    background: var(--grid-color);
    border: 2px solid #333;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
    display: block;
}

#game-canvas {
    border-color: var(--neon-blue);
    box-shadow: 0 0 15px rgba(0, 255, 255, 0.2);
}

#overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0, 0, 0, 0.85);
    padding: 40px;
    border-radius: 10px;
    text-align: center;
    border: 2px solid var(--neon-pink);
    box-shadow: 0 0 30px var(--neon-pink);
    z-index: 10;
}

#overlay.hidden {
    display: none;
}

#overlay h1 {
    font-size: 48px;
    margin: 0 0 20px 0;
    color: var(--neon-pink);
    text-shadow: 0 0 10px var(--neon-pink);
}

#start-btn {
    background: var(--neon-blue);
    color: #000;
    border: none;
    padding: 15px 30px;
    font-size: 20px;
    font-weight: bold;
    cursor: pointer;
    border-radius: 5px;
    transition: transform 0.2s, box-shadow 0.2s;
}

#start-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 0 15px var(--neon-blue);
}

.controls-hint {
    margin-top: 20px;
    font-size: 12px;
    color: #888;
    line-height: 1.5;
}

/* Animations */
@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;
}

.flash {
    animation: flash 0.2s;
}

@keyframes flash {
    0% { background-color: white; }
    100% { background-color: var(--grid-color); }
}