/* Dark Theme Background */
body {
    font-family: Arial, sans-serif;
    text-align: center;
    background-color: #1e1e1e;
    color: #ffffff;
    margin: 0;
    padding: 0;
}

/* Title Styling (Same as Sorting Visualizer) */
h1 {
    font-size: 2rem;
    font-weight: bold;
    color: #ffffff;
    margin: 20px 0;
    text-transform: uppercase;
    letter-spacing: 2px;
}

/* Control Panel Styling - Full Width */
#controls {
    background-color: #2b2b2b;
    padding: 15px;
    border-radius: 5px;
    margin: 10px auto;
    width: 95%; /* Expand to fit width */
    max-width: 1200px; /* Max width */
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

/* Button Groups - Ensure they expand properly */
.button-group {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    width: 100%; /* Ensures full width */
    flex-wrap: wrap; /* Allows wrapping on small screens */
}

/* Buttons Styling */
.control-btn {
    padding: 8px 15px;
    font-size: 16px;
    border: none;
    cursor: pointer;
    border-radius: 5px;
    transition: background 0.2s, transform 0.1s;
    background-color: #444; /* Default state */
    color: white;
}

/* Button Active State */
.control-btn.active {
    transform: scale(1.05);
}

/* Mode Selection Button - Default (Gray) */
.mode-btn {
    background-color: #555; /* Neutral color when inactive */
    color: white;
}

/* Mode Selection - Active State */
#mode-start.active {
    background-color: #2ecc71; /* Green for Start */
}

#mode-end.active {
    background-color: #e74c3c; /* Red for End */
}

#mode-wall.active {
    background-color: #34495e; /* Dark Gray-Blue for Wall */
}

#mode-erase.active {
    background-color: #f1c40f; /* Yellow for Erase */
}

/* Button Colors */
.green { background-color: #2ecc71; color: white; }
.red { background-color: #e74c3c; color: white; }
.gray { background-color: #34495e; color: white; }
.yellow { background-color: #f1c40f; color: black; }
.blue { background-color: #2980b9; color: white; }
.white { background-color: #ffffff; color: black; }

.control-btn:hover {
    transform: scale(1.05);
}

/* Grid Container */
#grid-container {
    display: grid;
    margin: 20px auto;
    width: fit-content;
    border: 2px solid #ffffff;
}

/* Grid Cells */
.cell {
    width: 30px;
    height: 30px;
    border: 1px solid #444;
    display: inline-block;
    text-align: center;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    transition: background 0.2s;
}

/* Node Colors */
.start { background-color: #2ecc71; } /* Bright Green */
.end { background-color: #e74c3c; } /* Bright Red */
.wall { background-color: #34495e; box-shadow: 0px 0px 5px rgba(255, 255, 255, 0.2); } /* Dark Gray with glow */
.visited { background-color: #f1c40f; animation: fadeIn 0.3s ease-in-out; } /* Yellow */
.path { background-color: #3498db; animation: fadeIn 0.3s ease-in-out; } /* Bright Blue */

/* Animations */
@keyframes fadeIn {
    from { background-color: #555; }
    to { background-color: inherit; }
}

/* Responsive Adjustments */
@media screen and (max-width: 1024px) {
    #controls {
        width: 100%;
        padding: 10px;
    }
    
    .button-group {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .control-btn {
        font-size: 14px;
        padding: 6px 12px;
    }
    
    #grid-container {
        width: 100%;
        overflow-x: auto;
    }

    .cell {
        width: 25px;
        height: 25px;
    }
}