/* Main styles for 3D Surface Plot Visualization */
:root {
    --primary-color: #2196F3;
    --secondary-color: #FFC107;
    --background-color: #f5f5f5;
    --text-color: #333;
    --border-color: #ddd;
    --control-bg: #fff;
    --control-hover: #e3f2fd;
    --header-bg: #fff;
    --help-menu-bg: #fff;
    --help-menu-text: #333;
    --analysis-results-bg: #fff;
    --analysis-hover-bg: rgba(33, 150, 243, 0.05);
    --analysis-hover-border: rgba(33, 150, 243, 0.1);
    --message-bg: rgba(76, 175, 80, 0.1);
    --message-border: #4caf50;
}

/* Dark mode color scheme */
[data-theme="dark"] {
    --primary-color: #64B5F6;
    --secondary-color: #FFD54F;
    --background-color: #121212;
    --text-color: #e0e0e0;
    --border-color: #424242;
    --control-bg: #1e1e1e;
    --control-hover: #2d2d2d;
    --header-bg: #1e1e1e;
    --help-menu-bg: #1e1e1e;
    --help-menu-text: #e0e0e0;
    --analysis-results-bg: #1e1e1e;
    --analysis-hover-bg: rgba(100, 181, 246, 0.08);
    --analysis-hover-border: rgba(100, 181, 246, 0.15);
    --message-bg: rgba(129, 199, 132, 0.15);
    --message-border: #81C784;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
}

/* Accessibility helper class for screen-reader-only content */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

.container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    height: 100vh;
}

header {
    margin-bottom: 20px;
    position: relative;
    background-color: var(--header-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--border-color);
}

h1 {
    color: var(--primary-color);
    margin-bottom: 10px;
    text-align: center;
}

.subtitle {
    margin: 0 0 20px 0;
    font-size: 0.85em;
    color: var(--text-color);
    opacity: 0.7;
    text-align: center;
    font-weight: 400;
    line-height: 1.3;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
    background-color: var(--control-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--border-color);
}

.control-group {
    display: flex;
    flex-direction: column;
    margin-bottom: 10px;
}

label {
    font-weight: bold;
    margin-bottom: 5px;
    font-size: 14px;
}

input[type="range"] {
    width: 100%;
    margin-bottom: 5px;
}

select {
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 14px;
    background-color: white;
}

.actions, .sample-data {
    display: flex;
    gap: 10px;
    margin-top: 20px;
    justify-content: center;
}

label {
    font-weight: 500;
    color: var(--text-color);
}

input[type="range"] {
    width: 100%;
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    transition: background 0.2s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    background: var(--secondary-color);
}

select {
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--control-bg);
    color: var(--text-color);
    cursor: pointer;
    outline: none;
}

select:hover {
    background-color: var(--control-hover);
}

button {
    padding: 8px 16px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.2s;
}

button:hover {
    background-color: var(--secondary-color);
}

/* Anchor styled as button for handout link */
.button-link {
    display: inline-block;
    padding: 8px 16px;
    background-color: var(--primary-color);
    color: #fff;
    border-radius: 4px;
    text-decoration: none;
    text-align: center;
    cursor: pointer;
}

.button-link:hover,
.button-link:focus {
    background-color: var(--secondary-color);
    outline: none;
}

/* Navigation toggle buttons - dynamically created toggle buttons */
.nav-toggle-button {
    margin: 8px 0;
    padding: 6px 14px;
    border-radius: 4px;
    border: none;
    background-color: #34495e;
    color: #ecf0f1;
    cursor: pointer;
    text-align: center;
    font-size: 14px;
    font-family: inherit;
    transition: background 0.2s, color 0.2s;
}

.nav-toggle-button:hover,
.nav-toggle-button:focus {
    background-color: #3498db;
    color: #fff;
}

/* Dark mode support for nav toggle buttons */
[data-theme="dark"] .nav-toggle-button {
    background-color: #2c3e50;
    color: #bdc3c7;
}

[data-theme="dark"] .nav-toggle-button:hover,
[data-theme="dark"] .nav-toggle-button:focus {
    background-color: #3498db;
    color: #fff;
}

main {
    display: grid;
    grid-template-columns: 1fr 300px;
    grid-template-rows: auto auto auto auto;
    gap: 20px;
}

.plot-container {
    grid-column: 1;
    grid-row: 1;
    position: relative;
}

.controls {
    grid-column: 1;
    grid-row: 3;
}

#glCanvas {
    width: 100%;
    height: 600px;
    background-color: #000;
    border-radius: 8px;
    display: block;
    outline: none; /* Remove default browser outline */
    border: 3px solid transparent; /* Invisible border to prevent layout shift */
    transition: border-color 0.2s ease-in-out;
}

#glCanvas:focus {
    border-color: #ffffff;
    box-shadow: 
        0 0 0 2px #000000, /* Inner black border for contrast */
        0 0 0 5px #ffffff, /* Outer white border */
        0 0 15px rgba(255, 255, 255, 0.5); /* Subtle glow effect */
}

/* Dark mode focus styling */
[data-theme="dark"] #glCanvas:focus {
    border-color: #ffffff;
    box-shadow: 
        0 0 0 2px #000000, /* Inner black border for contrast */
        0 0 0 5px #ffffff, /* Outer white border */
        0 0 15px rgba(255, 255, 255, 0.7); /* Slightly stronger glow in dark mode */
}

/* Light mode focus styling */
[data-theme="light"] #glCanvas:focus {
    border-color: #000000;
    box-shadow: 
        0 0 0 2px #ffffff, /* Inner white border for contrast */
        0 0 0 5px #000000, /* Outer black border */
        0 0 15px rgba(0, 0, 0, 0.3); /* Subtle dark glow */
}

/* High contrast focus for accessibility */
@media (prefers-contrast: high) {
    #glCanvas:focus {
        border-color: #ffff00 !important; /* Bright yellow border */
        box-shadow: 
            0 0 0 3px #000000, /* Thicker inner black border */
            0 0 0 6px #ffff00, /* Thicker outer yellow border */
            0 0 20px rgba(255, 255, 0, 0.8) !important; /* Stronger glow */
    }
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
    #glCanvas {
        transition: none; /* Remove transition animation */
    }
}

.accessibility-section {
    grid-column: 1 / 2;
    grid-row: 2;
    margin-top: 0;
}

.info-panel {
    background-color: var(--control-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--border-color);
    grid-column: 2;
    grid-row: 1 / span 4;
    height: 100%;
    overflow-y: auto;
}

.accessibility-info {
    background-color: #2c3e50;
    border-radius: 4px;
    padding: 15px;
    margin: 10px 0;
    border: 2px solid #34495e;
    color: #ffffff;
    grid-column: 1;
    grid-row: 2;
    margin-top: 20px;
}

.accessibility-info h3 {
    color: #ecf0f1;
    margin: 0 0 10px 0;
    font-size: 1.1em;
    border-bottom: 2px solid #3498db;
    padding-bottom: 5px;
}

.keyboard-controls {
    color: #ecf0f1;
    font-size: 0.9em;
}

.keyboard-controls p {
    margin: 8px 0;
    color: #3498db;
    font-weight: 500;
}

.keyboard-controls ul {
    list-style-type: none;
    padding-left: 15px;
    margin: 5px 0;
    background-color: #34495e;
    border-radius: 4px;
    padding: 10px;
}

.keyboard-controls li {
    margin: 8px 0;
    position: relative;
    padding-left: 20px;
}

.keyboard-controls li:before {
    content: "•";
    position: absolute;
    left: 0;
    color: #3498db;
    font-size: 1.2em;
}

.navigation-info {
    background-color: #2c3e50;
    border-radius: 4px;
    padding: 15px;
    margin: 10px 0;
    border: 2px solid #34495e;
    color: #ecf0f1;
}

.navigation-info p {
    margin: 5px 0;
    padding: 5px;
    background-color: #34495e;
    border-radius: 3px;
}

.navigation-info p:first-child {
    color: #3498db;
    font-weight: 500;
}

.navigation-info strong {
    color: #3498db;
    font-weight: 600;
}

/* Special styling for the key info panel */
.navigation-info div {
    background-color: rgba(52, 73, 94, 0.3) !important;
    border: 1px solid #3498db;
    margin-top: 10px;
    padding: 8px;
    border-radius: 4px;
}

.navigation-info div p {
    background-color: transparent !important;
    margin: 3px 0;
    padding: 2px 0;
}

.navigation-info div strong {
    color: #ecf0f1;
    background-color: #3498db;
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 0.9em;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .accessibility-info,
    .navigation-info {
        background-color: #000;
        border: 2px solid #fff;
    }
    
    .keyboard-controls,
    .navigation-info {
        color: #fff;
    }
    
    .keyboard-controls p {
        color: #fff;
    }
    
    .keyboard-controls ul {
        background-color: #000;
        border: 1px solid #fff;
    }
    
    .keyboard-controls li:before {
        color: #fff;
    }
    
    .navigation-info p {
        background-color: #000;
        border: 1px solid #fff;
    }
}

/* Help Menu Styles */
.help-menu {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1001;
}

.help-menu[aria-hidden="false"] {
    display: flex;
    justify-content: center;
    align-items: center;
}

.help-menu-content {
    background-color: var(--help-menu-bg);
    color: var(--help-menu-text);
    padding: 2rem;
    border-radius: 8px;
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--border-color);
}

#helpMenuTitle {
    margin-top: 0;
    margin-bottom: 1rem;
    color: var(--help-menu-text);
}

#helpMenuTitle:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.close-help {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    line-height: 1;
    color: var(--help-menu-text);
}

.close-help:hover,
.close-help:focus {
    color: var(--primary-color);
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.keyboard-controls {
    margin-top: 1rem;
}

.keyboard-controls h3 {
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
}

.keyboard-controls ul {
    list-style-type: none;
    padding-left: 1rem;
}

.keyboard-controls li {
    margin-bottom: 0.5rem;
}

/* Screen reader only class */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.performance {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.sample-info, .analysis-results {
    margin-top: 20px;
}

h3 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

#fps {
    font-weight: bold;
}

#fps.low {
    color: #f44336;
}

#fps.medium {
    color: #ff9800;
}

#fps.high {
    color: #4caf50;
}

/* Analysis Results Styling */
.analysis-results {
    padding: 15px;
    background-color: var(--analysis-results-bg);
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    margin-top: 20px;
    border: 1px solid var(--border-color);
}

.analysis-results h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
}

.analysis-results h4 {
    color: var(--text-color);
    margin: 15px 0 10px;
}

.results-table {
    overflow-x: auto;
    margin-top: 10px;
}

.results-table table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9em;
}

.results-table th {
    background-color: var(--primary-color);
    color: white;
    text-align: left;
    padding: 8px 12px;
}

.results-table td {
    padding: 8px 12px;
    border-bottom: 1px solid var(--border-color);
}

.results-table tr:nth-child(even) {
    background-color: var(--analysis-hover-bg);
}

.results-table tr:hover {
    background-color: var(--analysis-hover-border);
}

.results-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 10px;
}

.results-list div {
    padding: 8px 12px;
    border-radius: 4px;
    background-color: var(--analysis-hover-bg);
    border: 1px solid var(--border-color);
}

.message {
    padding: 15px;
    background-color: var(--message-bg);
    border-left: 4px solid var(--message-border);
    border-radius: 4px;
    margin-top: 10px;
    line-height: 1.5;
    color: var(--text-color);
}

#analysisResults {
    min-height: 100px;
}

.analysis-buttons {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.analysis-buttons button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 8px 12px;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
    font-size: 0.9em;
    flex: 1;
    min-width: 120px;
}

.analysis-buttons button:hover {
    background-color: #1976D2;
    transform: translateY(-2px);
}

.analysis-buttons button:active {
    transform: translateY(0);
}

/* Dark mode toggle button */
.dark-mode-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    border-radius: 50px;
    padding: 8px 16px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: 120px;
    justify-content: center;
}

.dark-mode-toggle:hover {
    background-color: var(--primary-color);
    color: var(--control-bg);
    transform: translateY(-1px);
}

.dark-mode-toggle:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.dark-mode-toggle:active {
    transform: translateY(0);
}

.dark-mode-toggle-icon {
    font-size: 16px;
    transition: transform 0.3s ease;
}

[data-theme="dark"] .dark-mode-toggle-icon {
    transform: rotate(180deg);
}

/* Update header styling */
header {
    margin-bottom: 20px;
    position: relative;
    background-color: var(--header-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--border-color);
}

/* Update help menu for dark mode */
.help-menu-content {
    background-color: var(--help-menu-bg);
    color: var(--help-menu-text);
}

/* Responsive design for dark mode toggle */
@media (max-width: 768px) {
    .dark-mode-toggle {
        position: static;
        margin: 10px auto 20px;
        order: -1;
    }
    
    header {
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    
    h1 {
        order: 1;
    }
    
    .controls {
        grid-template-columns: 1fr;
        order: 2;
    }
    
    .actions, .sample-data {
        order: 3;
        flex-wrap: wrap;
    }
    
    button {
        flex: 1 1 calc(50% - 10px);
    }
}

/* Sample info panel specific styles */
#sampleInfo {
    padding: 8px;
    font-size: 14px;
    line-height: 1.4;
}

#sampleInfo h3 {
    margin: 0 0 10px 0;
    color: var(--accent-color);
}

/* Comprehensive statistics display styles */
.sample-stats {
    margin: 0;
}

.sample-stats h4 {
    margin: 0 0 6px 0;
    color: var(--primary-color);
    font-size: 18px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 3px;
    font-weight: 700;
}

.sample-stats h5 {
    margin: 6px 0 3px 0;
    color: var(--text-color);
    font-size: 13px;
    font-weight: 600;
}

.description {
    margin: 0 0 8px 0;
    font-style: italic;
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.3;
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 6px;
    margin-bottom: 8px;
}

.dimension-stats {
    background: rgba(52, 73, 94, 0.1);
    padding: 4px;
    border-radius: 3px;
    border-left: 2px solid var(--primary-color);
}

[data-theme="dark"] .dimension-stats {
    background: rgba(74, 144, 226, 0.1);
}

.stat-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 2px 0;
    font-size: 12px;
}

.stat-label {
    color: var(--text-secondary);
    font-weight: 500;
    flex: 0 0 auto;
    min-width: 45px;
}

.stat-value {
    color: var(--text-color);
    font-family: monospace;
    font-size: 11px;
    text-align: right;
    flex: 1;
}

.stat-value.highlight {
    color: var(--primary-color);
    font-weight: 600;
}

.stat-value.valid {
    color: #27ae60;
}

.stat-value.invalid {
    color: #e74c3c;
}

.summary-stats {
    background: rgba(52, 73, 94, 0.2);
    padding: 4px;
    border-radius: 3px;
    margin-top: 6px;
}

[data-theme="dark"] .summary-stats {
    background: rgba(74, 144, 226, 0.2);
}

.summary-stats h5 {
    margin-top: 0;
    color: var(--primary-color);
}

/* Mobile responsive adjustments */
@media (max-width: 768px) {
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 4px;
    }
    
    .dimension-stats {
        padding: 3px;
    }
    
    .stat-row {
        font-size: 11px;
    }
    
    .stat-value {
        font-size: 10px;
    }
}

.variable-selection {
    display: flex;
    gap: 15px;
    margin-top: 15px;
    padding: 15px;
    background-color: var(--control-bg);
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--border-color);
}

.variable-group {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.variable-group label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-color);
}

.variable-group select {
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--control-bg);
    color: var(--text-color);
    font-size: 14px;
    cursor: pointer;
}

.variable-group select:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.variable-group select:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Review Mode Text Field */
.review-text-field-container {
    margin-bottom: 15px;
    padding: 8px;
    background-color: var(--control-bg);
    border: 2px solid var(--primary-color);
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    display: inline-block;
    max-width: calc(100% - 40px);
}

.review-mode-instructions {
    font-size: 12px;
    margin: 0 0 8px 0;
    color: var(--text-color);
    opacity: 0.8;
    font-style: italic;
    white-space: nowrap;
}

.review-text-field {
    width: auto;
    max-width: calc(100vw - 80px);
    height: 1.8em;
    padding: 4px 8px;
    font-family: 'Courier New', Consolas, Monaco, monospace;
    font-size: 14px;
    line-height: 1.2;
    background-color: var(--background-color);
    color: var(--text-color);
    border: 2px solid var(--border-color);
    border-radius: 6px;
    resize: none;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
    caret-color: var(--primary-color);
    cursor: text;
    overflow: hidden;
    white-space: nowrap;
    /* Enable text selection and caret navigation */
    -webkit-user-select: text;
    -moz-user-select: text;
    -ms-user-select: text;
    user-select: text;
    /* Force caret visibility and ensure proper text navigation */
    caret-shape: auto;
    /* Ensure the field always shows the caret when focused */
    -webkit-user-modify: read-only;
    -moz-user-modify: read-only;
}

.review-text-field:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.1);
}

/* Dark mode overrides for review text field */
[data-theme="dark"] .review-text-field {
    background-color: #1a1a1a;
    border-color: #444;
    caret-color: var(--primary-color);
}

[data-theme="dark"] .review-text-field:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(100, 181, 246, 0.15);
}

/* Selection styles for better visibility */
.review-text-field::selection {
    background-color: var(--primary-color);
    color: white;
}

[data-theme="dark"] .review-text-field::selection {
    background-color: var(--primary-color);
    color: #000;
}

/* Hide variable selection panel by default; toggled via JS when needed */
.variable-selection,
#variableSelection {
    display: none;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .review-text-field-container {
        border-width: 3px;
    }
    
    .review-text-field {
        border-width: 3px;
        font-weight: 600;
        caret-color: #000;
    }
    
    .review-text-field:focus {
        box-shadow: 0 0 0 4px rgba(33, 150, 243, 0.3);
    }
    
    [data-theme="dark"] .review-text-field {
        caret-color: #fff;
    }
}

/* Mobile responsiveness for review text field */
@media (max-width: 768px) {
    .review-text-field-container {
        margin-bottom: 15px;
        padding: 8px;
        max-width: calc(100% - 20px);
    }
    
    .review-text-field {
        font-size: 12px;
        max-width: calc(100vw - 40px);
        padding: 3px 6px;
        height: 1.6em;
    }
    
    .review-mode-instructions {
        font-size: 11px;
    }
}