/* Base Styles */
:root {
    --primary-color: #1e88e5;
    --primary-dark: #1565c0;
    --primary-light: #e3f2fd;
    --unvisited-color: #fff;
    --queued-color: #4caf50;
    --visited-color: #f44336;
    --current-color: #ff9800;
    --text-color: #333;
    --text-secondary: #616161;
    --border-color: #e0e0e0;
    --background-color: #f5f5f5;
    --danger-color: #f44336;
}

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

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

h1 {
    font-size: 1.5rem;
    font-weight: 500;
}

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

button#helpBtn {
    background-color: white;
    color: var(--primary-color);
    border: none;
    padding: 0.3rem 0.8rem;
    border-radius: 4px;
    font-size: 0.875rem;
    cursor: pointer;
}

button#helpBtn:hover {
    background-color: #f5f5f5;
}

a#aboutLink {
    color: white;
    text-decoration: none;
    font-size: 0.875rem;
}

a#aboutLink:hover {
    text-decoration: underline;
}

main {
    flex-grow: 1;
    padding: 1.5rem;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

footer {
    background-color: #616161;
    color: white;
    text-align: center;
    padding: 0.75rem;
    font-size: 0.875rem;
}

/* Visualization Area */
.visualization-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.canvas-container {
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    padding: 1rem;
    flex-grow: 1;
    position: relative;
}

.canvas-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.canvas-header h2 {
    font-size: 1.25rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.legend {
    display: flex;
    gap: 1rem;
}

.legend-item {
    display: flex;
    align-items: center;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.legend-color {
    display: inline-block;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    margin-right: 4px;
}

.legend-color.unvisited {
    background-color: var(--unvisited-color);
    border: 2px solid var(--primary-color);
}

.legend-color.queued {
    background-color: var(--queued-color);
}

.legend-color.visited {
    background-color: var(--visited-color);
}

.legend-color.current {
    background-color: var(--current-color);
}

#canvas {
    width: 100%;
    height: 450px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: white;
    overflow: hidden;
    position: relative;
}

.editing-hints {
    position: absolute;
    top: 10px;
    right: 10px;
    background-color: rgba(255, 255, 255, 0.9);
    padding: 8px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.queue-visualization {
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    padding: 1rem;
}

.queue-visualization h2 {
    font-size: 1.25rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.queue-container {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding: 8px;
    min-height: 80px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    align-items: center;
}

.queue-item {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: var(--queued-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 500;
    font-size: 1.125rem;
    border: 2px solid var(--primary-color);
}

.empty-queue {
    color: var(--text-secondary);
    font-style: italic;
}

/* Controls Area */
.controls-area {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.control-panel {
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    padding: 1rem;
    flex: 1;
    min-width: 300px;
}

.control-panel h2 {
    font-size: 1.25rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 1rem;
}

.control-group {
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
}

.control-group label {
    flex: 0 0 100px;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.control-group select,
.control-group input[type="text"],
.control-group input[type="range"] {
    flex: 1;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 0.875rem;
}

.algorithm-status {
    background-color: #f5f5f5;
    padding: 0.5rem;
    border-radius: 4px;
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.status-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.25rem;
}

.status-row:last-child {
    margin-bottom: 0;
}

.animation-controls {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.animation-controls button {
    background-color: transparent;
    border: none;
    font-size: 1.25rem;
    padding: 0.25rem;
    cursor: pointer;
    border-radius: 4px;
    color: var(--text-secondary);
}

.animation-controls button:hover {
    background-color: #f5f5f5;
}

.animation-controls button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.action-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
    margin-top: 1rem;
}

.primary-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.5rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.875rem;
    transition: background-color 0.2s;
}

.primary-btn:hover {
    background-color: var(--primary-dark);
}

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

.secondary-btn {
    background-color: white;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    padding: 0.5rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.875rem;
    transition: background-color 0.2s;
}

.secondary-btn:hover {
    background-color: var(--primary-light);
}

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

.danger-btn {
    background-color: white;
    color: var(--danger-color);
    border: 1px solid var(--danger-color);
    padding: 0.5rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.875rem;
    width: 100%;
    transition: background-color 0.2s;
}

.danger-btn:hover {
    background-color: #ffebee;
}

/* Toggle Switch */
.toggle {
    justify-content: space-between;
}

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 46px;
    height: 24px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 24px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--primary-color);
}

input:checked + .slider:before {
    transform: translateX(22px);
}

/* Editor Sections */
.editor-section {
    margin-bottom: 1.5rem;
}

.editor-section h3 {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.node-creation {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.25rem;
}

.node-creation input {
    flex: 1;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 0.875rem;
}

.edge-creation {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 0.25rem;
}

.edge-creation select {
    flex: 1;
    min-width: 80px;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 0.875rem;
}

.hint {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.presets {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}

.preset-btn {
    background-color: white;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    padding: 0.5rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.875rem;
    transition: background-color 0.2s;
}

.preset-btn:hover {
    background-color: var(--primary-light);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
}

.modal-content {
    background-color: white;
    margin: 10% auto;
    padding: 1.5rem;
    border-radius: 8px;
    width: 80%;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
}

.close {
    color: #aaa;
    float: right;
    font-size: 1.5rem;
    font-weight: bold;
    cursor: pointer;
}

.close:hover {
    color: black;
}

.modal h2 {
    margin-bottom: 1rem;
    color: var(--text-color);
}

.modal h3 {
    margin: 1rem 0 0.5rem;
    color: var(--text-color);
}

.modal p {
    margin-bottom: 1rem;
}

.modal ul, .modal ol {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

.modal li {
    margin-bottom: 0.5rem;
}

.color-dot {
    display: inline-block;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    margin-right: 4px;
}

.color-dot.unvisited {
    background-color: var(--unvisited-color);
    border: 2px solid var(--primary-color);
}

.color-dot.queued {
    background-color: var(--queued-color);
}

.color-dot.visited {
    background-color: var(--visited-color);
}

.color-dot.current {
    background-color: var(--current-color);
}

/* SVG Styles */
svg {
    width: 100%;
    height: 100%;
    cursor: crosshair;
}

.node {
    stroke-width: 2px;
    cursor: move;
}

.node-unvisited {
    fill: white;
    stroke: var(--primary-color);
}

.node-queued {
    fill: var(--queued-color);
    stroke: var(--primary-color);
}

.node-visited {
    fill: var(--visited-color);
    stroke: var(--primary-color);
}

.node-current {
    fill: var(--current-color);
    stroke: var(--primary-color);
}

.edge {
    stroke: #999;
    stroke-width: 2px;
}

.edge-highlight {
    stroke: var(--primary-color);
    stroke-width: 3px;
}

/* Responsive Design */
@media (min-width: 768px) {
    .container {
        flex-direction: row;
    }
    
    .visualization-area {
        flex: 3;
    }
    
    .controls-area {
        flex: 1;
        flex-direction: column;
    }
}

@media (max-width: 767px) {
    header {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }
    
    .legend {
        margin-top: 0.5rem;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .canvas-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .control-group {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .control-group label {
        margin-bottom: 0.25rem;
    }
}