body {
    font-family: 'Inter', sans-serif;
    background-color: #f0f4f8; /* Light background */
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    flex-direction: column;
    padding: 1rem;
}

.game-wrapper {
    background-color: #ffffff; /* White card background */
    padding: 2rem;
    border-radius: 1.5rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.game-container {
    position: relative;
    background-color: #d1d9e6; /* Light gray inner board color */
    border: 8px solid #a8b0c4; /* Soft blue-gray border */
    border-radius: 0.5rem;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}
.block {
    position: absolute;
    cursor: grab;
    transition: transform 0.1s ease-out;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(0, 0, 0, 0.1);
    touch-action: none;
    border-radius: 4px;
}
.block.is-dragging {
    cursor: grabbing;
}
.key-block {
    background-color: #ffb703; /* Bright golden key */
    z-index: 10;
}
.key-block .key-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 70%;
    height: 70%;
    fill: #023047; /* Dark blue fill for key icon */
}
.obstacle-block {
    background-color: #6c757d; /* Soft gray-blue */
}

.exit-marker {
    position: absolute;
    right: -8px; 
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 60px; 
    background-color: #ffb703;
    z-index: 5;
    box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.2);
    border-right: 2px solid #e29578;
}

/* Modal Popup */
.modal {
    display: none;
    position: fixed;
    z-index: 20;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4);
    justify-content: center;
    align-items: center;
}
.modal-content {
    background-color: #ffffff;
    padding: 2rem;
    border-radius: 1rem;
    text-align: center;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    animation: fadeIn 0.3s ease-in-out;
    transform: scale(0.9);
}
.modal-title {
    font-size: 2.5rem;
    font-weight: bold;
    color: #023047;
    margin-bottom: 1rem;
}
.modal-text {
    font-size: 1.25rem;
    color: #4a5568;
    margin-bottom: 1.5rem;
}

footer {
    background-color: white;
    text-align: center;
    margin-top: auto;
    width: 100%;
    box-sizing: border-box;
    position: fixed;
    bottom: 0;
    left: 0;
    z-index: 100;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 10px 0;
}

.footer-links {
    color: #555;
    font-size: 0.8em;
    margin-bottom: 10px;
    display: flex;
    gap: 20px;
}

.footer-links a {
    color: #555;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--accent-color);
}

.footer-copyright {
    color: #777;
    font-size: 0.7em;
}

@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.8); }
    to { opacity: 1; transform: scale(1); }
}