:root {
    --primary-color: #34495e;
    --secondary-color: #2c3e50;
    --accent-color: #3498db;
    --start-node-color: #2ecc71;
    --file-end-node-color: #e74c3c;
    /* Using a different name to avoid confusion with end-of-file */
    --target-node-color: #e74c3c;
    --wall-node-color: #0c3547;
    --path-node-color: #f1c40f;
    --visited-node-color: #00bcd4;
    /* Light blue */
    --visited-node-color-2: #9b59b6;
    /* Purple for weighted/secondary if needed */
    --border-color: #afd8f8;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* Navbar */
.navbar {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: bold;
}

.nav-controls {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}

.control-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Buttons */
.btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
    transition: background-color 0.2s;
    background-color: #bdc3c7;
    color: #2c3e50;
}

.btn:hover:not(:disabled) {
    opacity: 0.9;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background-color: var(--accent-color);
    color: white;
}

.btn-warning {
    background-color: #f39c12;
    color: white;
}

.btn-danger {
    background-color: #c0392b;
    color: white;
}

select {
    padding: 0.5rem;
    border-radius: 4px;
}

/* Legend */
.legend {
    display: flex;
    justify-content: center;
    gap: 2rem;
    padding: 1rem;
    background-color: #ecf0f1;
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
}

/* Grid */
#grid-container {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
    overflow: auto;
    background-color: white;
}

.grid {
    border-collapse: collapse;
}

.grid-row {
    display: flex;
}

/* Nodes */
.node {
    width: 25px;
    height: 25px;
    border: 1px solid var(--border-color);
    background-color: white;
}

/* Remove internal borders to make it look cleaner if desired, keeping for now */

.node-start {
    background-color: var(--start-node-color);
}

.node-target {
    background-color: var(--target-node-color);
}

.node-wall {
    background-color: var(--wall-node-color);
    border-color: var(--wall-node-color);
    animation: wallAnimation 0.3s ease-out forwards;
}

.node-visited {
    animation: visitedAnimation 1.5s ease-out forwards;
}

.node-path {
    animation: shortestPathAnimation 1.5s ease-out forwards;
}

/* Animations from original sorting visualizer repo inspiration */
@keyframes wallAnimation {
    0% {
        transform: scale(0.3);
    }

    50% {
        transform: scale(1.2);
    }

    100% {
        transform: scale(1);
    }
}

@keyframes visitedAnimation {
    0% {
        transform: scale(0.3);
        background-color: rgba(0, 0, 66, 0.75);
        border-radius: 100%;
    }

    50% {
        background-color: rgba(17, 104, 217, 0.75);
    }

    75% {
        transform: scale(1.2);
        background-color: rgba(0, 217, 159, 0.75);
    }

    100% {
        transform: scale(1);
        background-color: rgba(0, 190, 218, 0.75);
    }
}

@keyframes shortestPathAnimation {
    0% {
        transform: scale(0.6);
        background-color: rgb(255, 254, 106);
    }

    50% {
        transform: scale(1.2);
        background-color: rgb(255, 254, 106);
    }

    100% {
        transform: scale(1);
        background-color: rgb(255, 254, 106);
    }
}