/* Base */
body {
    font-family: Arial, sans-serif;
    margin: 20px;
    background: #a3a3cc;
    color: #222;
}

#container {
    max-width: 1200px;
    margin: auto;
}

/* Panels */
#intro,
#input-form,
#viz,
#steps-panel,
#queue-history-panel {
    margin: 18px 0;
    padding: 18px;
    background: #ceceeb;
    border-radius: 10px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.06);
    width: 100%;
}

h1,
h2 {
    color: #000000;
    margin: 4px 0 12px;
}

label {
    display: block;
    margin: 8px 0;
    font-weight: 600;
}

input[type="number"],
select,
input[type="range"] {
    padding: 6px 8px;
    margin-left: 8px;
    border-radius: 6px;
    border: 1px solid #292966;
}

button {
    font-size: 16px;
    font-weight: 600;
    padding: 8px 12px;
    margin: 6px 6px 0 0;
    background: #292966;
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}

button:hover {
    font-size: 16px;
    font-weight: 600;
    background: #a3a3cc;
    color: #292966;
}

#graph-svg {
    display: block;
    margin: 12px auto;
    margin-bottom: -250px;
    background: #fafafa;
    border-radius: 8px;
    width: 100%;
    border: 1px solid #e6e9ef;
}

/* Nodes & edges */
.node circle {
    stroke: #000000;
    stroke-width: 1.5px;
    cursor: move;
    transition: fill 0.12s ease;
}

.node text {
    font-weight: 700;
    font-size: 13px;
    pointer-events: none;
    text-anchor: middle;
    dominant-baseline: central;
    fill: #ffffff;
}

.edge-path {
    stroke: #9aa0a6;
    stroke-width: 2px;
    fill: none;
    marker-end: url(#arrowhead);
}

.edge-path.traversal {
    stroke: #db1111;
    stroke-width: 3.5px;
}

/* Controls */
#controls {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
    padding: 10px;
    background: #ceceeb;
    border-radius: 8px;
    justify-content: center;
    width: 100%;
    max-width: 800px;
    margin-bottom: 25px auto;
    margin: 70px auto;
    box-sizing: border-box;
    }

#controls button {
    padding: 6px 12px;
    font-size: 1rem;
    cursor: pointer;
    border: 1px solid #ccc;
    border-radius: 5px;
    background: #292966;
    color: white;
    transition: background 0.2s;
    white-space: nowrap;
}

#controls button:hover {
    background: #a3a3cc;
    color: #292966;
}

#controls label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 18px;
    flex-shrink: 0;
    white-space: nowrap;
}

#controls input[type="range"] {
    flex: 1 1 150px;
    min-width: 100px;
    max-width: 300px;
}

/* Steps panel */
#step-text {
    min-height: 200px;
    max-height: 360px;
    overflow-y: auto;
    border-radius: 8px;
    padding: 12px;
    background: #fbfdff;
    border: 1px solid #e7eefc;
    white-space: pre-line;
    font-size: 14px;
    line-height: 1.5;
}

#final-order {
    background: #292966;
    border: 1px solid #ccccff;
    padding: 10px;
    border-radius: 8px;
    margin-top: 10px;
    color: #ffffff;
}

/* Edge input styling */
#edge-list .edge-input {
    margin: 8px 0;
    padding: 8px;
    background: #f5f7fb;
    border-radius: 6px;
    border: 1px solid #e9eef8;
    display: flex;
    gap: 8px;
    align-items: center;
}

#edge-list input {
    width: 56px;
    text-align: center;
}

#viz {
    position: relative;
    height: 785px;
}

#legend {
    bottom: 12px;
    left: 12px;
    width: 140px;
    background: rgba(204, 204, 255, 0.9);
    border: 1px solid #292966;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 14px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
    pointer-events: none;
    z-index: 10;
    margin-top: 115px;
    margin-left: 12px;
}

#legend h4 {
    margin: 0 0 6px 0;
    font-size: 15px;
    text-align: left;
}

.legend-box {
    margin-top: 2px;
    margin-bottom: 0px;
    display: inline-block;
    width: 16px;
    height: 16px;
    margin-right: 6px;
    border: 1px solid #444;
    vertical-align: middle;
}

.legend-box.visited {
    background-color: #088a3a;
}

.legend-box.current {
    background-color: #e9e218;
}

.legend-box.notvisited {
    background-color: #292966;
}

.legend-box.edge {
    background-color: #db1111;
}

/* Current Queue Display (top right) */

#queue-container.bfs {
    flex-direction: row-reverse;
    position: absolute;
    top: 45px;
    right: 33px;
    display: flex;
    gap: 4px;
    z-index: 10;
}

.queue-item {
    width: 50px;
    height: 50px;
    border: 1px solid #000000;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: sans-serif;
    font-size: 1.2em;
    color: #333;
    background-color: #7878c1;
    transition: background-color 0.3s ease;
}

.queue-item.empty {
    background-color: #ffffff;
    border: 1px dashed #cccccc;
}

/* Queue History Panel */
#queue-history-panel {
    margin-top: 20px;
}

#queue-history-container {
    max-height: 500px;
    overflow-y: auto;
    padding: 10px;
    background: #fbfdff;
    border: 1px solid #e7eefc;
    border-radius: 8px;
}

.history-step {
    margin-bottom: 20px;
    padding: 12px;
    background: #ceceeb;
    border: 1px solid #ddd;
    border-radius: 6px;
}

.history-step-label {
    font-weight: bold;
    margin-bottom: 8px;
    color: #292966;
    font-size: 14px;
}

.history-queue-display {
    display: flex;
    gap: 4px;
    flex-wrap: nowrap;
    flex-direction: row-reverse;
}

.history-queue-item {
    width: 50px;
    height: 50px;
    border: 1px solid #000000;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: sans-serif;
    font-size: 1.2em;
    color: #333;
    background-color: #7878c1;
}

.history-queue-item.empty {
    background-color: #ffffff;
    border: 1px dashed #cccccc;
}

/* Custom slider styling for full fill */
input[type="range"] {
    appearance: none;
    -webkit-appearance: none;
    width: 150px;
    height: 8px;
    background: #ddd;
    border-radius: 25px;
    outline: none;
    cursor: pointer;
    margin-top: 10px;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 0;
    width: 0;
    border-radius: 50%;
    background: #292966;
    border: 0px solid #333;
    margin-top: -5px;
    margin-left: -15px;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-runnable-track {
    width: 100%;
    height: 8px;
    border-radius: 5px;
}

/* Sidebar */
#sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    width: 220px;
    background: #a5a5c9;
    padding: 20px 12px;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.08);
    z-index: 100;
}

#sidebar h3 {
    margin-bottom: 16px;
    color: #000000;
    font-size: 18px;
    font-weight: 700;
    text-align: center;
}

#sidebar button {
    display: block;
    width: 100%;
    margin: 10px 0;
    padding: 10px;
    background: #292966;
    color: #ffffff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 15px;
    font-weight: 600;
    transition: background 0.2s;
}

#sidebar button:hover {
    background: #5c5c99;
}

#container {
    margin-left: 240px;
    background-color: #a3a3cc;
}

/* Navigation Buttons */
#nav-buttons {
    display: flex;
    gap: 12px;
    justify-content: left;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.06);
    margin: 18px 0;
    padding: 18px;
    background: #ceceeb;
    border-radius: 10px;
    width: 100%;
}

#nav-buttons button {
    padding: 10px 24px;
    font-size: 16px;
    font-weight: 600;
    background: #292966;
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s;
}

#nav-buttons button:hover {
    background: #a3a3cc;
    color: #292966;
}

#nav-buttons button:active {
    background: #292966;
    color: #a3a3cc;
}