:root {
    --board-size: 10;
    --cell-size: 50px;
    /* Soft pastel color palette for a friendly game atmosphere */
    --bg-gradient-start: #ffeaa7;
    --bg-gradient-end: #fab1a0;
    --board-bg: rgba(255, 255, 255, 0.3);
    --primary-color: #6c5ce7;
    --secondary-color: #fd79a8;
    --success-color: #00b894;
    --warning-color: #fdcb6e;
    --danger-color: #d63031;
    --text-dark: #2d3436;
    --text-light: #ffffff;
    --shadow-soft: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 6px 12px rgba(0, 0, 0, 0.15);
    --shadow-large: 0 10px 25px rgba(0, 0, 0, 0.2);
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    /* Gradient background for visual depth */
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: var(--text-dark);
}

#game-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 30px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    box-shadow: var(--shadow-large);
    position: relative;
}

.ui-panel {
    width: calc(var(--board-size) * var(--cell-size));
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

#level-display {
    font-size: 20px;
    font-weight: bold;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--text-light);
    padding: 10px 24px;
    border-radius: 30px;
    box-shadow: var(--shadow-medium);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.02); }
}

#progress-display {
    font-size: 18px;
    font-weight: bold;
    color: var(--text-dark);
    background: linear-gradient(135deg, #dfe6e9, #b2bec3);
    padding: 10px 20px;
    border-radius: 30px;
    box-shadow: var(--shadow-soft);
}

#progress-text {
    color: var(--primary-color);
    margin-left: 8px;
    font-size: 20px;
}

#game-board {
    width: calc(var(--board-size) * var(--cell-size));
    height: calc(var(--board-size) * var(--cell-size));
    position: relative;
    background: var(--board-bg);
    border-radius: 15px;
    box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.1);
    /* Add subtle grid pattern */
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.1) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.1) 1px, transparent 1px);
    background-size: var(--cell-size) var(--cell-size);
}

.animal {
    width: calc(var(--cell-size) * 0.9);
    height: calc(var(--cell-size) * 0.9);
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    cursor: pointer;
    position: absolute;
    top: calc(var(--y) * var(--cell-size) + (var(--cell-size) * 0.05));
    left: calc(var(--x) * var(--cell-size) + (var(--cell-size) * 0.05));
    transition: left 0.5s ease-out, top 0.5s ease-out, opacity 0.5s, transform 0.2s;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

.animal:hover {
    transform: scale(1.1);
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.3));
}

.animal.removing {
    opacity: 0;
}

/* Guinea pig faces down by default, so we adjust rotations accordingly */
.animal.up { transform: rotate(180deg); }
.animal.down { transform: rotate(0deg); }
.animal.left { transform: rotate(90deg); }
.animal.right { transform: rotate(-90deg); }

.animal.up:hover { transform: rotate(180deg) scale(1.1); }
.animal.down:hover { transform: rotate(0deg) scale(1.1); }
.animal.left:hover { transform: rotate(90deg) scale(1.1); }
.animal.right:hover { transform: rotate(-90deg) scale(1.1); }

.ui-panel.bottom {
    margin-top: 25px;
    gap: 15px;
    display: flex;
}

/* Base button styles */
button {
    padding: 14px 28px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 30px;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    box-shadow: var(--shadow-medium);
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
}

/* Button shine effect */
button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s;
}

button:hover::before {
    left: 100%;
}

/* Shuffle button - Playful yellow */
#shuffle-btn {
    background: linear-gradient(135deg, #fdcb6e, #f39c12);
}

#shuffle-btn:hover {
    background: linear-gradient(135deg, #f39c12, #e67e22);
    transform: translateY(-2px) rotate(-2deg);
    box-shadow: var(--shadow-large);
}

#shuffle-btn:active {
    transform: translateY(0) rotate(0);
}

/* Restart button - Fresh green */
#restart-btn {
    background: linear-gradient(135deg, #00b894, #00cec9);
}

#restart-btn:hover {
    background: linear-gradient(135deg, #00cec9, #00b894);
    transform: translateY(-2px) rotate(2deg);
    box-shadow: var(--shadow-large);
}

#restart-btn:active {
    transform: translateY(0) rotate(0);
}

/* Mute button - Elegant purple */
#mute-btn {
    padding: 14px 20px;
    font-size: 22px;
    min-width: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

#mute-btn:hover {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    transform: translateY(-2px) scale(1.1);
    box-shadow: var(--shadow-large);
}

#mute-btn:active {
    transform: translateY(0) scale(1);
}

/* Add a subtle bounce animation for buttons */
@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-5px); }
}

button:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.3);
}

/* Responsive adjustments */
@media (max-width: 600px) {
    :root {
        --cell-size: 40px;
    }
    
    button {
        padding: 10px 20px;
        font-size: 14px;
    }
    
    #level-display, #progress-display {
        font-size: 16px;
        padding: 8px 16px;
    }
}