/* Quantum Random Walk Explorer Styles */

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* CSS Variables */
:root {
    --primary: #2196f3;
    --primary-dark: #1976d2;
    --success: #4caf50;
    --danger: #f44336;
    --warning: #ff9800;
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --text-primary: #212121;
    --text-secondary: #757575;
    --border-color: #e0e0e0;
}

/* Typography and Layout */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    background: var(--primary);
    color: white;
    padding: 30px 20px;
    margin-bottom: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
}

header p {
    font-size: 1.1em;
    opacity: 0.95;
}

/* Navigation */
.back-button {
    display: inline-block;
    margin-bottom: 20px;
    padding: 8px 16px;
    background: var(--primary);
    color: white;
    text-decoration: none;
    border-radius: 4px;
    font-size: 0.95em;
    transition: background 0.3s;
}

.back-button:hover {
    background: var(--primary-dark);
}

/* Main Content */
.main-card {
    background: var(--bg-primary);
    border-radius: 8px;
    padding: 25px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.1);
}

.description {
    font-size: 1.05em;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.info-box {
    background: var(--bg-secondary);
    border-left: 4px solid var(--primary);
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 4px;
}

/* Controls */
.unified-controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
    padding: 20px;
    background: var(--bg-secondary);
    border-radius: 4px;
}

.control-group {
    display: flex;
    flex-direction: column;
}

.control-group label {
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-size: 0.95em;
}

.control-group input,
.control-group select {
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1em;
    font-family: inherit;
}

.control-group input:focus,
.control-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(33, 150, 243, 0.1);
}

.control-hint {
    font-size: 0.85em;
    color: var(--text-secondary);
    margin-top: 5px;
}

/* Checkbox Group */
.checkbox-group {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px;
    background: var(--bg-secondary);
    border-radius: 4px;
    margin-bottom: 20px;
}

.checkbox-group input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.checkbox-group label {
    cursor: pointer;
    font-weight: 500;
    margin: 0;
}

/* Buttons */
.button-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

button {
    padding: 12px 24px;
    border: none;
    border-radius: 4px;
    background: var(--primary);
    color: white;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s;
}

button:hover {
    background: var(--primary-dark);
}

button:disabled {
    background: #ccc;
    cursor: not-allowed;
}

/* Tabs */
.tab-headers {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--border-color);
}

.tab-header {
    padding: 12px 20px;
    background: none;
    border: none;
    border-bottom: 3px solid transparent;
    color: var(--text-secondary);
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s;
    margin-bottom: -2px;
}

.tab-header:hover {
    color: var(--primary);
}

.tab-header.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Main Layout with Sidebar */
.main-layout {
    display: flex;
    gap: 20px;
    margin-top: 30px;
}

/* Sidebar Styles */
.sidebar {
    width: 280px;
    background: var(--bg-primary);
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: width 0.3s ease, margin-left 0.3s ease;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.sidebar.collapsed {
    width: 60px;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--primary);
    color: white;
    border-radius: 8px 8px 0 0;
}

.sidebar.collapsed .sidebar-header {
    padding: 20px 15px;
}

.sidebar-toggle {
    background: rgba(255,255,255,0.2);
    border: none;
    border-radius: 4px;
    color: white;
    cursor: pointer;
    padding: 8px;
    transition: background-color 0.2s;
    flex-shrink: 0;
}

.sidebar-toggle:hover {
    background: rgba(255,255,255,0.3);
}

.toggle-icon {
    font-size: 14px;
    transition: transform 0.3s ease;
    display: block;
}

.sidebar.collapsed .toggle-icon {
    transform: rotate(180deg);
}

.sidebar-header h3 {
    margin: 0;
    font-size: 1.1em;
    white-space: nowrap;
    overflow: hidden;
    transition: opacity 0.3s ease;
}

.sidebar.collapsed .sidebar-header h3 {
    opacity: 0;
    width: 0;
}

/* Sidebar Navigation */
.sidebar-nav {
    flex: 1;
    padding: 20px 0;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 12px 20px;
    color: var(--text-primary);
    text-decoration: none;
    transition: all 0.2s ease;
    border-left: 3px solid transparent;
    gap: 12px;
}

.nav-item:hover {
    background: var(--bg-secondary);
    border-left-color: var(--primary);
}

.nav-item.active {
    background: rgba(33, 150, 243, 0.1);
    border-left-color: var(--primary);
    color: var(--primary);
    font-weight: 500;
}

.nav-icon {
    font-size: 18px;
    width: 20px;
    text-align: center;
    flex-shrink: 0;
}

.nav-text {
    white-space: nowrap;
    transition: opacity 0.3s ease;
}

.sidebar.collapsed .nav-text {
    opacity: 0;
    width: 0;
    overflow: hidden;
}

/* Sidebar Controls */
.sidebar-controls {
    border-top: 1px solid var(--border-color);
    padding: 20px;
}

.sidebar.collapsed .sidebar-controls {
    padding: 15px;
}

.control-section h4 {
    margin: 0 0 15px 0;
    font-size: 0.9em;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    white-space: nowrap;
    transition: opacity 0.3s ease;
}

.sidebar.collapsed .control-section h4 {
    opacity: 0;
    width: 0;
    overflow: hidden;
}

/* Main Content Area */
.main-content {
    flex: 1;
    background: var(--bg-primary);
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    overflow: hidden;
}

.content-view {
    display: none;
    padding: 30px;
    min-height: 600px;
}

.content-view.active {
    display: block;
}

/* Responsive Design */
@media (max-width: 768px) {
    .main-layout {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        height: auto;
    }
    
    .sidebar.collapsed {
        width: 100%;
        height: 60px;
    }
    
    .main-content {
        min-height: 400px;
    }
}

/* Quick Controls in Sidebar */
.quick-controls {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.quick-buttons {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.quick-btn {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--bg-primary);
    color: var(--text-primary);
    cursor: pointer;
    font-size: 13px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
}

.quick-btn:hover {
    background: var(--bg-secondary);
    border-color: var(--primary);
}

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

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

.quick-params {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.param-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.param-row label {
    font-size: 12px;
    color: var(--text-secondary);
    white-space: nowrap;
}

.param-row select {
    flex: 1;
    padding: 4px 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 12px;
    background: var(--bg-primary);
}

.sidebar.collapsed .quick-controls {
    display: none;
}

/* Educational Content Styles */
.education-content {
    max-width: 800px;
    margin: 0 auto;
}

.edu-section {
    margin: 40px 0;
    padding: 25px;
    background: var(--bg-secondary);
    border-radius: 8px;
    border-left: 4px solid var(--primary);
}

.edu-section h3 {
    color: var(--primary);
    margin-bottom: 15px;
    font-size: 1.4em;
}

.edu-section h4 {
    color: var(--text-primary);
    margin: 15px 0 10px 0;
    font-size: 1.1em;
}

.equation-box {
    background: var(--bg-primary);
    padding: 20px;
    border-radius: 6px;
    margin: 20px 0;
    border: 1px solid var(--border-color);
}

.equation-box h4 {
    color: var(--primary);
    margin-bottom: 10px;
}

.equation-box ul {
    margin-top: 15px;
    padding-left: 20px;
}

.equation-box li {
    margin: 8px 0;
    color: var(--text-secondary);
}

.comparison-box {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin: 20px 0;
}

.quantum-side, .classical-side {
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.quantum-side {
    background: rgba(33, 150, 243, 0.1);
    border-left: 4px solid var(--primary);
}

.classical-side {
    background: rgba(76, 175, 80, 0.1);
    border-left: 4px solid var(--success);
}

.quantum-side h4, .classical-side h4 {
    margin-bottom: 10px;
}

.coin-examples, .boundary-examples {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin: 20px 0;
}

.coin-card, .boundary-card {
    background: var(--bg-primary);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.coin-card:hover, .boundary-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.coin-card h4, .boundary-card h4 {
    color: var(--primary);
    margin-bottom: 10px;
}

.applications-list {
    list-style: none;
    padding: 0;
    margin: 20px 0;
}

.applications-list li {
    background: var(--bg-primary);
    padding: 15px;
    margin: 10px 0;
    border-radius: 6px;
    border-left: 3px solid var(--primary);
    transition: transform 0.2s ease;
}

.applications-list li:hover {
    transform: translateX(5px);
}

.action-box {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    padding: 30px;
    border-radius: 8px;
    text-align: center;
    margin: 40px 0;
}

.action-box h3 {
    color: white;
    margin-bottom: 15px;
}

.primary-btn {
    background: white;
    color: var(--primary);
    border: none;
    padding: 12px 25px;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-top: 15px;
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

/* Visualization */
.visualization {
    background: var(--bg-secondary);
    border-radius: 4px;
    padding: 15px;
    margin: 20px 0;
    text-align: center;
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Statistics Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 15px;
    margin: 20px 0;
}

.stat-item {
    background: var(--bg-secondary);
    padding: 15px;
    border-radius: 4px;
    border-left: 3px solid var(--primary);
}

.stat-label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.9em;
    margin-bottom: 5px;
}

.stat-value {
    font-size: 1.4em;
    color: var(--primary);
    font-weight: bold;
    font-family: 'Courier New', monospace;
}

/* Tables */
.analysis-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    background: white;
    border-radius: 4px;
    overflow: hidden;
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.analysis-table thead {
    background: var(--bg-secondary);
}

.analysis-table th {
    padding: 12px;
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-color);
    font-size: 0.95em;
}

.analysis-table td {
    padding: 12px;
    border-bottom: 1px solid var(--border-color);
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

.analysis-table tr:hover {
    background: var(--bg-secondary);
}

/* Legend */
.legend {
    background: var(--bg-secondary);
    padding: 15px;
    border-radius: 4px;
    margin: 20px 0;
    font-size: 0.95em;
}

.legend-item {
    margin: 8px 0;
}

.legend-term {
    font-weight: 600;
    color: var(--primary);
}

/* Equations */
.equation {
    background: var(--bg-secondary);
    padding: 15px;
    border-radius: 4px;
    margin: 20px 0;
    text-align: center;
}

/* Timeline Slider */
.timeline-container {
    margin-bottom: 20px;
}

.timeline-label {
    font-weight: 600;
    display: block;
    margin-bottom: 8px;
}

.timeline-controls {
    display: flex;
    gap: 10px;
    align-items: center;
}

.timeline-slider {
    flex: 1;
    cursor: pointer;
}

.timeline-display {
    font-weight: 600;
    min-width: 50px;
    text-align: right;
}

/* Progress Bar */
.progress-container {
    margin-top: 20px;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
}

.progress-label {
    font-weight: 600;
}

.progress-time {
    font-size: 0.9em;
    color: var(--text-secondary);
}

.progress-bar-bg {
    background: var(--bg-secondary);
    border-radius: 4px;
    overflow: hidden;
    height: 20px;
}

.progress-bar {
    background: var(--primary);
    height: 100%;
    width: 0%;
    transition: width 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.progress-percent {
    font-size: 0.75em;
    font-weight: 600;
    color: white;
    min-width: 30px;
}

/* Footer */
footer {
    text-align: center;
    padding: 20px;
    color: var(--text-secondary);
    margin-top: 40px;
}

/* Responsive Design */
@media (max-width: 768px) {
    header h1 {
        font-size: 1.8em;
    }

    .unified-controls {
        grid-template-columns: 1fr;
    }

    .tab-headers {
        flex-wrap: wrap;
    }
}