/* Dark Mode Support */
:root {
    --body-bg: #ffffff;
    --body-color: #333333;
    --heading-color: #2c3e50;
    --link-color: #0d6efd;
    --link-hover-color: #0a58ca;
    --sidebar-bg: #ffffff;
    --sidebar-border: rgba(0, 0, 0, 0.1);
    --nav-link-color: #495057;
    --nav-link-active-bg: rgba(13, 110, 253, 0.1);
    --nav-link-active-color: #0d6efd;
    --nav-link-hover-bg: rgba(13, 110, 253, 0.05);
    --section-border: #f8f9fa;
    --card-bg: #ffffff;
    --card-border: #dee2e6;
    --interactive-bg: #f8f9fa;
    --interactive-border: #e9ecef;
    --code-bg: #f8f9fa;
    --progress-bg: #e9ecef;
    --progress-bar: #0d6efd;
    --toc-bg: #ffffff;
    --highlight-bg: #ffeb3b;
    --search-result-border: #e9ecef;
    --box-shadow: rgba(0, 0, 0, 0.05);
    --box-shadow-hover: rgba(0, 0, 0, 0.1);
}

body.dark-mode {
    --body-bg: #1a1a1a;
    --body-color: #e0e0e0;
    --heading-color: #ffffff;
    --link-color: #6ea8fe;
    --link-hover-color: #8bb9fe;
    --sidebar-bg: #252525;
    --sidebar-border: rgba(255, 255, 255, 0.1);
    --nav-link-color: #b0b0b0;
    --nav-link-active-bg: rgba(110, 168, 254, 0.15);
    --nav-link-active-color: #6ea8fe;
    --nav-link-hover-bg: rgba(110, 168, 254, 0.05);
    --section-border: #2c2c2c;
    --card-bg: #2c2c2c;
    --card-border: #3a3a3a;
    --interactive-bg: #2c2c2c;
    --interactive-border: #3a3a3a;
    --code-bg: #2a2a2a;
    --progress-bg: #3a3a3a;
    --progress-bar: #6ea8fe;
    --toc-bg: #252525;
    --highlight-bg: #8b7800;
    --search-result-border: #3a3a3a;
    --box-shadow: rgba(0, 0, 0, 0.2);
    --box-shadow-hover: rgba(0, 0, 0, 0.3);
}

/* Paper Viewer Styles */
body {
    font-family: 'Nunito', sans-serif;
    line-height: 1.6;
    color: var(--body-color);
    background-color: var(--body-bg);
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
    margin: 0;
    padding: 0;
    font-size: calc(1rem * var(--font-size-multiplier));
}

h1, h2, h3, h4, h5, h6 {
    color: var(--heading-color);
}

a {
    color: var(--link-color);
    transition: color 0.15s ease-in-out;
}

a:hover {
    color: var(--link-hover-color);
}

/* Sidebar styles */
.sidebar {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 100;
    padding: 0;
    box-shadow: inset -1px 0 0 var(--sidebar-border);
    overflow-y: auto;
    transition: transform 0.3s ease;
    background-color: var(--sidebar-bg);
}

.sidebar-hidden .sidebar {
    transform: translateX(-100%);
}

.sidebar-hidden .content-pane {
    margin-left: 0;
    width: 100%;
}

.nav-link {
    display: flex;
    align-items: center;
    padding: 0.5rem 1rem;
    color: var(--nav-link-color);
    text-decoration: none;
    transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out;
}

.nav-link i {
    margin-right: 0.5rem;
}

.nav-link:hover, .nav-link:focus {
    color: var(--link-color);
    background-color: var(--nav-link-hover-bg);
}

.nav-link.active {
    color: var(--nav-link-active-color);
    font-weight: 600;
    background-color: var(--nav-link-active-bg);
}

/* Navigation styling */
.nav-link-warning {
    color: #dc3545 !important;
    border-left: 3px solid #dc3545 !important;
}

.nav-link-warning:hover {
    background-color: rgba(220, 53, 69, 0.1);
}

/* Content area styles */
.content-pane {
    transition: margin-left 0.3s ease, width 0.3s ease;
}

.paper-section {
    margin-bottom: 3rem;
    padding-top: 1rem;
    scroll-margin-top: 70px; /* Ensures sections don't get hidden behind the header when scrolled to */
}

.paper-section h2 {
    color: var(--heading-color);
    border-bottom: 2px solid var(--section-border);
    padding-bottom: 0.5rem;
    margin-bottom: 1.5rem;
}

.paper-section h3 {
    color: #3d5a80;
    margin-top: 2rem;
    margin-bottom: 1rem;
    scroll-margin-top: 70px;
}

.abstract-content {
    font-style: italic;
    margin: 20px 0;
    padding: 15px;
    background-color: #f8f9fa;
    border-left: 4px solid #6c757d;
}

/* Interactive elements */
.interactive-element {
    border: 1px solid var(--interactive-border);
    background-color: var(--interactive-bg);
    padding: 20px;
    margin: 25px 0;
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--box-shadow);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.interactive-element:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--box-shadow-hover);
}

.jsxgraph, .desmos-graph {
    width: 100%;
    height: 450px;
    margin: 20px 0;
    border: 1px solid #ddd;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

/* Hide Desmos logo and attribution */
.dcg-container .dcg-footer {
    display: none !important;
}
.dcg-container .dcg-expressionlist .dcg-attribution {
    display: none !important;
}
.dcg-container .dcg-powered-by {
    display: none !important;
}
.dcg-logo-container {
    display: none !important;
}

.formula-controls {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px dashed #dee2e6;
}

.formula-controls input[type="range"] {
    width: 100%;
    margin: 10px 0;
}

.formula-controls .form-label {
    font-weight: 500;
    color: #495057;
}

.formula-output {
    margin-top: 15px;
    font-weight: bold;
    color: #0d6efd;
}

/* Code formatting */
.code-block {
    background-color: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: 5px;
    margin: 20px 0;
    padding: 1rem;
}

pre {
    background-color: var(--code-bg);
    padding: 1rem;
    border-radius: 0.25rem;
    overflow-x: auto;
    margin-bottom: 0;
}

code {
    font-family: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    font-size: 0.875em;
}

/* Theorems, definitions, and examples */
.theorem, .definition, .example {
    margin: 15px 0;
    padding: 10px 15px;
    border-radius: 5px;
}

.theorem {
    background-color: #e3f2fd;
    border-left: 4px solid #0d6efd;
}

.definition {
    background-color: #f8f9fa;
    border-left: 4px solid #6c757d;
}

.example {
    background-color: #f0f9ff;
    border-left: 4px solid #0dcaf0;
}

/* Reading progress bar */
.progress {
    height: 6px;
    background-color: var(--progress-bg);
    border-radius: 3px;
    overflow: hidden;
}

.progress-bar {
    background-color: var(--progress-bar);
    transition: width 0.3s ease;
}

/* Tool sections */
.tool-section {
    margin-bottom: 3rem;
    padding-top: 1rem;
}

.preset-btn {
    margin-right: 0.5rem;
}

/* Search functionality */
.search-container {
    position: relative;
    margin-bottom: 1rem;
}

.search-results {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: white;
    border: 1px solid #dee2e6;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    max-height: 400px;
    overflow-y: auto;
    display: none;
    animation: slideDown 0.2s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.search-result-item {
    padding: 12px 16px;
    border-bottom: 1px solid var(--search-result-border);
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.search-result-item:hover {
    background-color: #f8f9fa;
}

.search-result-item:last-child {
    border-bottom: none;
}

.search-result-item .result-title {
    font-weight: 600;
    color: #0d6efd;
    margin-bottom: 4px;
}

.search-result-item .result-context {
    font-size: 0.875rem;
    color: #6c757d;
    line-height: 1.4;
}

/* Enhanced search styles */
.search-result-item.selected {
    background-color: rgba(13, 110, 253, 0.1);
    border-left: 3px solid #0d6efd;
}

.search-result-item.selected .result-title {
    color: #0d6efd;
}

.search-result-item.selected .result-context {
    color: #495057;
}

.search-input-group {
    display: flex;
    gap: 0.5rem;
}

.search-input-group .form-control {
    border-radius: 8px;
    border: 1px solid #dee2e6;
    padding: 0.5rem 1rem;
    transition: all 0.2s ease;
}

.search-input-group .form-control:focus {
    border-color: #0d6efd;
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}

.search-input-group .btn {
    border-radius: 8px;
    padding: 0.5rem 1rem;
    transition: all 0.2s ease;
}

.search-input-group .btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* Search results animation */
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.search-results {
    animation: slideDown 0.2s ease;
}

/* Search highlight animation */
@keyframes highlightPulse {
    0% {
        background-color: #ffeb3b;
    }
    50% {
        background-color: #fff176;
    }
    100% {
        background-color: #ffeb3b;
    }
}

.highlight {
    background-color: var(--highlight-bg);
    padding: 2px 0;
    animation: highlightPulse 2s ease infinite;
}

/* Table of Contents */
.toc-container {
    position: sticky;
    top: 70px;
    z-index: 990;
    background-color: var(--toc-bg);
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.toc-content {
    max-height: calc(100vh - 140px);
    overflow-y: auto;
    padding: 1rem;
}

.toc-item {
    padding: 0.5rem 0;
    font-size: 0.9rem;
}

.toc-item a {
    color: #495057;
    text-decoration: none;
    display: block;
    padding: 0.5rem 0.75rem;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.toc-item a:hover {
    background-color: #f8f9fa;
    color: #0d6efd;
    transform: translateX(4px);
}

.toc-item.active > a {
    color: #0d6efd;
    font-weight: 600;
    background-color: rgba(13, 110, 253, 0.1);
}

.toc-subitem {
    padding-left: 1.5rem;
}

/* Reading progress in sidebar */
.reading-progress {
    padding: 0.75rem 1rem;
    background-color: #f8f9fa;
    border-radius: 8px;
    margin-bottom: 1rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

/* Print styles */
@media print {
    .sidebar, .btn-toolbar, .toc-container, .search-container {
        display: none !important;
    }
    
    .content-pane {
        margin-left: 0 !important;
        width: 100% !important;
    }
    
    .paper-section {
        page-break-inside: avoid;
        margin-bottom: 2rem;
    }
    
    .interactive-element {
        border: 1px solid #ddd;
        box-shadow: none;
        page-break-inside: avoid;
    }
    
    .jsxgraph, .desmos-graph {
        height: 300px;
        border: 1px solid #ddd;
    }
    
    a[href]:after {
        content: " (" attr(href) ")";
        font-size: 0.8em;
        color: #6c757d;
    }
}

/* Responsive adjustments */
@media (max-width: 767.98px) {
    .sidebar {
        position: fixed;
        top: 0;
        width: 85%;
        height: 100%;
        z-index: 1030;
        background-color: white;
        transform: translateX(-100%);
        box-shadow: 2px 0 5px rgba(0, 0, 0, 0.1);
    }
    
    .sidebar-visible .sidebar {
        transform: translateX(0);
    }
    
    .content-pane {
        margin-left: 0 !important;
        width: 100% !important;
    }
    
    .top-nav {
        position: sticky;
        top: 0;
        z-index: 1020;
        background-color: white;
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    }
    
    .toc-container {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        z-index: 1040;
        background-color: rgba(0, 0, 0, 0.5);
    }
    
    .toc-container .card {
        margin: 1rem;
        max-height: calc(100% - 2rem);
    }
}

/* Dark Mode Toggle */
.dark-mode-toggle {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 1000;
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 2px 10px var(--box-shadow);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.dark-mode-toggle:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 15px var(--box-shadow-hover);
}

.dark-mode-toggle i {
    font-size: 24px;
    color: var(--body-color);
    transition: transform 0.3s ease;
}

.dark-mode .dark-mode-toggle i.bi-moon-fill {
    display: none;
}

.dark-mode .dark-mode-toggle i.bi-sun-fill {
    display: inline-block;
}

.dark-mode-toggle i.bi-sun-fill {
    display: none;
}

.dark-mode-toggle i.bi-moon-fill {
    display: inline-block;
}

/* Tooltip for dark mode toggle */
.dark-mode-toggle::after {
    content: "Toggle Dark Mode";
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--card-bg);
    color: var(--body-color);
    padding: 5px 10px;
    border-radius: 4px;
    font-size: 12px;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s ease;
    white-space: nowrap;
    box-shadow: 0 2px 5px var(--box-shadow);
}

.dark-mode-toggle:hover::after {
    opacity: 1;
}

/* Accessibility Features */
.skip-to-content {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--link-color);
    color: white;
    padding: 8px 12px;
    z-index: 10000;
    transition: top 0.3s;
    border-radius: 0 0 4px 0;
    text-decoration: none;
}

.skip-to-content:focus {
    top: 0;
}

.keyboard-shortcut-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 10000;
}

.keyboard-shortcut-content {
    background-color: var(--card-bg);
    padding: 24px;
    border-radius: 8px;
    max-width: 500px;
    width: 90%;
    box-shadow: 0 4px 12px var(--box-shadow);
}

.keyboard-shortcut-table {
    width: 100%;
    margin: 16px 0;
    border-collapse: collapse;
}

.keyboard-shortcut-table th,
.keyboard-shortcut-table td {
    padding: 8px 12px;
    text-align: left;
    border-bottom: 1px solid var(--card-border);
}

.keyboard-shortcut-table th {
    font-weight: 600;
    color: var(--heading-color);
}

.keyboard-shortcut-table kbd {
    background-color: var(--interactive-bg);
    border: 1px solid var(--interactive-border);
    border-radius: 4px;
    box-shadow: 0 1px 1px var(--box-shadow);
    color: var(--body-color);
    padding: 2px 6px;
    font-family: monospace;
    font-size: 0.9em;
}

/* Focus styles for accessibility */
a:focus, button:focus, input:focus, select:focus, textarea:focus, [tabindex]:focus {
    outline: 3px solid var(--link-color);
    outline-offset: 2px;
}

/* High contrast focus indicator in dark mode */
body.dark-mode a:focus, 
body.dark-mode button:focus, 
body.dark-mode input:focus, 
body.dark-mode select:focus, 
body.dark-mode textarea:focus, 
body.dark-mode [tabindex]:focus {
    outline-color: #ffffff;
}

/* Hide focus outline for mouse users, show for keyboard */
body:not(.keyboard-nav) a:focus, 
body:not(.keyboard-nav) button:focus, 
body:not(.keyboard-nav) input:focus, 
body:not(.keyboard-nav) select:focus, 
body:not(.keyboard-nav) textarea:focus, 
body:not(.keyboard-nav) [tabindex]:focus {
    outline: none;
    box-shadow: none;
}

/* Back to top button */
.back-to-top {
    position: fixed;
    bottom: 80px;
    right: 20px;
    width: 50px;
    height: 50px;
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 2px 10px var(--box-shadow);
    transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.3s ease;
    z-index: 990;
    opacity: 0;
    visibility: hidden;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 15px var(--box-shadow-hover);
}

.back-to-top i {
    font-size: 24px;
    color: var(--body-color);
}

@media print {
    .skip-to-content, 
    .keyboard-shortcut-modal, 
    .dark-mode-toggle,
    .back-to-top {
        display: none !important;
    }
}

/* Citation and Sharing Features */
.section-buttons {
    display: inline-flex;
    align-items: center;
    margin-left: 12px;
    opacity: 0;
    transition: opacity 0.2s ease;
}

h2:hover .section-buttons,
h3:hover .section-buttons {
    opacity: 1;
}

.section-button {
    background: none;
    border: none;
    padding: 4px;
    margin: 0 2px;
    color: var(--body-color);
    font-size: 16px;
    opacity: 0.7;
    transition: all 0.2s ease;
}

.section-button:hover {
    opacity: 1;
    color: var(--link-color);
    transform: translateY(-2px);
}

.section-button.success {
    color: #28a745;
}

/* Citation modal */
.citation-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 10000;
}

.citation-modal-content {
    background-color: var(--card-bg);
    border-radius: 8px;
    max-width: 600px;
    width: 90%;
    box-shadow: 0 4px 12px var(--box-shadow);
    overflow: hidden;
}

.citation-modal-header {
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--card-border);
}

.citation-modal-header h3 {
    margin: 0;
    font-size: 18px;
    color: var(--heading-color);
}

.citation-modal-close {
    background: none;
    border: none;
    font-size: 24px;
    line-height: 1;
    padding: 0;
    cursor: pointer;
    color: var(--body-color);
    opacity: 0.7;
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.citation-modal-close:hover {
    opacity: 1;
    transform: scale(1.1);
}

.citation-modal-body {
    padding: 24px;
}

.citation-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
    border-bottom: 1px solid var(--card-border);
    padding-bottom: 8px;
}

.citation-tab {
    background: none;
    border: none;
    padding: 8px 16px;
    cursor: pointer;
    border-radius: 4px;
    color: var(--body-color);
    transition: all 0.2s ease;
}

.citation-tab:hover {
    background-color: var(--interactive-bg);
}

.citation-tab.active {
    background-color: var(--link-color);
    color: white;
}

.citation-content {
    background-color: var(--interactive-bg);
    padding: 16px;
    border-radius: 4px;
    margin-bottom: 16px;
}

.citation-content pre {
    margin: 0 0 16px 0;
    white-space: pre-wrap;
    word-break: break-word;
    background-color: transparent;
    padding: 0;
    font-family: monospace;
    font-size: 0.9em;
    color: var(--body-color);
}

/* Social sharing */
.social-share-container {
    position: fixed;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    z-index: 99;
    background-color: var(--body-bg);
    border-radius: 30px;
    padding: 10px 5px;
    box-shadow: 0 2px 10px var(--box-shadow);
    border: 1px solid var(--card-border);
}

.social-share-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.social-share-button {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    color: var(--body-color);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    padding: 0;
    font-size: 16px;
}

.social-share-button:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 8px var(--box-shadow-hover);
}

.social-share-button.twitter {
    color: #1da1f2;
}

.social-share-button.facebook {
    color: #1877f2;
}

.social-share-button.linkedin {
    color: #0a66c2;
}

.social-share-button.email {
    color: #ea4335;
}

@media (max-width: 1200px) {
    .social-share-container {
        position: fixed;
        bottom: 20px;
        right: 20px;
        top: auto;
        transform: none;
        border-radius: 20px;
    }
    
    .social-share-buttons {
        flex-direction: row;
    }
}

@media print {
    .section-buttons,
    .social-share-container {
        display: none !important;
    }
}

/* Loading indicator */
.loading-spinner {
    display: inline-block;
    width: 80px;
    height: 80px;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 9999;
}

.loading-spinner:after {
    content: " ";
    display: block;
    width: 64px;
    height: 64px;
    margin: 8px;
    border-radius: 50%;
    border: 6px solid var(--link-color);
    border-color: var(--link-color) transparent var(--link-color) transparent;
    animation: loading-spinner 1.2s linear infinite;
}

@keyframes loading-spinner {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 9998;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Visual Tool: MathJax loading indicator */
.math-loading {
    display: inline-block;
    background-color: var(--interactive-bg);
    color: var(--nav-link-color);
    padding: 2px 5px;
    border-radius: 3px;
    font-size: 0.9em;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% { opacity: 0.6; }
    50% { opacity: 1; }
    100% { opacity: 0.6; }
}

/* Mathematical Notation Helper */
.math-helper-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 400px;
    max-width: 90vw;
    max-height: 80vh;
    overflow-y: auto;
    background-color: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 5px 15px var(--box-shadow);
    z-index: 1050;
    border: 1px solid var(--card-border);
    transition: transform 0.3s ease, opacity 0.3s ease;
    transform-origin: bottom right;
}

.math-helper-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 15px;
    border-bottom: 1px solid var(--card-border);
    background-color: var(--card-bg);
    border-top-left-radius: 8px;
    border-top-right-radius: 8px;
    position: sticky;
    top: 0;
    z-index: 1;
}

.math-helper-header h5 {
    margin: 0;
    font-size: 1rem;
    color: var(--heading-color);
}

.math-helper-content {
    padding: 15px;
}

.math-helper-container .accordion-button {
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
    background-color: var(--card-bg);
    color: var(--body-color);
}

.math-helper-container .accordion-button:not(.collapsed) {
    background-color: var(--card-bg);
    color: var(--link-color);
}

.math-helper-container .accordion-button:focus {
    box-shadow: none;
    border-color: var(--card-border);
}

.math-helper-container .accordion-button::after {
    width: 1rem;
    height: 1rem;
    background-size: 1rem;
}

.math-helper-container .accordion-body {
    padding: 0.75rem 1rem;
    font-size: 0.9rem;
}

.search-common-symbols {
    margin-top: 15px;
}

.symbol-label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.9rem;
    color: var(--nav-link-color);
}

.common-symbols {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
}

.symbol-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
}

/* Tooltip for math terms */
.math-tooltip {
    position: absolute;
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 8px 12px;
    border-radius: 4px;
    box-shadow: 0 2px 8px var(--box-shadow);
    font-size: 0.9rem;
    max-width: 300px;
    z-index: 1060;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.math-tooltip.visible {
    opacity: 1;
}

/* Add styles for the font size controls in the navbar */
.font-size-control {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.25rem 0.5rem;
}

.font-size-control i {
    font-size: 14px;
}