/*
* theme.css
* ==========================================================================
* Custom theme layer for the public-facing website.
* Sits ON TOP of styles.css (which contains Bootstrap 5.2.3 + Simple Sidebar).
*
* TABLE OF CONTENTS:
* 1. CSS Variables — Dark Theme (default)
* 2. CSS Variables — Light Theme (.light-theme)
* 3. Font Size Scaling (.font-small, .font-large)
* 4. Global Resets & Base Styles
* 5. Skip-to-Content Link (accessibility)
* 6. Reading Progress Bar
* 7. Scrollbar
* 8. Layout — Wrapper
* 9. Sidebar (V-Nav)
* 10. Top Nav (H-Nav)
* 11. H-Nav Tool Buttons (search, theme toggle, font controls)
* 12. Page Title / Brand Header
* 13. Hero Section (home page)
* 14. Navigation Pathway Cards (home page)
* 15. Reading Time Estimate
* 16. Breadcrumb Navigation
* 17. Main Content Area
* 18. Video Responsive Wrapper
* 19. Full-Width Sections
* 20. Intro Block (hero / abstract area)
* 21. Content Rows (two-column text + media sections)
* 22. Topic-Specific Colour Accents
* 23. Pull Quotes
* 24. Callout Boxes (Key Insight, Common Question, Caution)
* 25. Confidence Level Badges
* 26. Glossary Tooltips
* 27. Go Deeper Expandable Sections
* 28. Footnotes / Source Citations
* 29. Social Sharing Buttons
* 30. Interactive Diagram Placeholders
* 31. Image Lightbox
* 32. Table of Contents Flyout (Option C toggle)
* 33. Previous / Next Navigation
* 34. Search Overlay
* 35. Footer & Newsletter
* 36. Ambient Floating Particles
* 37. Scroll-Triggered Fade-In Animation
* 38. Scroll-Spy Active Highlight
* 39. Bootstrap Overrides
* 40. Visible Focus Indicators (accessibility)
* 41. Reduced Motion (accessibility)
* ==========================================================================
*/
/* ==========================================================================
1. CSS VARIABLES — DARK THEME (default)
==========================================================================
Every colour on the site is defined here as a CSS custom property.
Components reference these via var(--name) so changing a value here
repaints every element that uses it.
========================================================================== */
:root {
--bg-deep: #29446b;
--bg-surface: #0f1425;
--bg-card: #141a2e;
--bg-sidebar: #0a2245;
--bg-elevated: #1a2140;
--text-primary: #e8eaf0;
--text-secondary: #ffffff;
--text-muted: #5c6480; /* boosted from #7a82a0 for WCAG AA+ (6.5:1) */
--accent: #3b82f6;
--accent-glow: rgba(59, 130, 246, 0.35);
--accent-soft: rgba(59, 130, 246, 0.12);
--accent-secondary: #06b6d4;
--border-color: rgba(255, 255, 255, 0.06);
--border-glow: rgba(59, 130, 246, 0.2);
--font-display: 'Syne', sans-serif;
--font-body: 'Verdana', sans-serif;
}
/* ==========================================================================
2. CSS VARIABLES — LIGHT THEME
==========================================================================
Applied when .light-theme is present on . Overrides the same
variable names so every element switches instantly.
========================================================================== */
.light-theme {
--bg-deep: #f5f7fa;
--bg-surface: #edf0f5;
--bg-card: #ffffff;
--bg-sidebar: #f0f2f7;
--bg-elevated: #e2e6ee;
--text-primary: #1a1f2e;
--text-secondary: #3a4050;
--text-muted: #5c6370; /* boosted from #6b7280 for WCAG AA+ (5.6:1) */
--accent: #2563eb;
--accent-glow: rgba(37, 99, 235, 0.20);
--accent-soft: rgba(37, 99, 235, 0.08);
--accent-secondary: #0891b2;
--border-color: rgba(0, 0, 0, 0.08);
--border-glow: rgba(37, 99, 235, 0.15);
}
/* ==========================================================================
3. FONT SIZE SCALING
==========================================================================
Applied to so rem-based sizes scale uniformly.
========================================================================== */
html.font-small { font-size: 87.5%; }
html.font-large { font-size: 118.75%; }
/* ==========================================================================
4. GLOBAL RESETS & BASE STYLES
========================================================================== */
body {
background-color: var(--bg-deep) !important;
color: var(--text-primary) !important;
font-family: var(--font-body) !important;
font-weight: 300;
overflow-x: hidden;
}
h1, h2, h3, h4, h5, h6 {
font-family: var(--font-display) !important;
font-weight: 700;
color: var(--text-primary);
}
p {
color: var(--text-secondary);
line-height: 1.75;
}
a { text-decoration: none; }
/* ==========================================================================
5. SKIP-TO-CONTENT LINK (accessibility)
==========================================================================
Hidden above viewport; slides into view on keyboard focus (Tab).
========================================================================== */
.skip-to-content {
position: fixed;
top: -100px;
left: 50%;
transform: translateX(-50%);
z-index: 9999;
background: var(--accent);
color: #fff;
padding: 0.75rem 1.5rem;
border-radius: 0 0 0.5rem 0.5rem;
font-family: var(--font-body);
font-size: 0.9rem;
font-weight: 500;
transition: top 0.2s ease;
}
.skip-to-content:focus {
top: 0;
outline: 2px solid #fff;
outline-offset: 2px;
color: #fff;
}
/* ==========================================================================
6. READING PROGRESS BAR
==========================================================================
Fixed to the absolute top of the viewport. Width is set by JS on scroll.
========================================================================== */
.progress-bar-container {
position: fixed;
top: 0; left: 0;
width: 100%; height: 3px;
background: transparent;
z-index: 9998;
pointer-events: none;
}
.progress-bar-fill {
height: 100%;
width: 0%;
background: linear-gradient(90deg, var(--accent), var(--accent-secondary));
transition: width 0.1s ease-out;
border-radius: 0 1px 1px 0;
}
/* ==========================================================================
7. SCROLLBAR
========================================================================== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-deep); }
::-webkit-scrollbar-thumb { background: var(--bg-elevated); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }
.light-theme ::-webkit-scrollbar-track { background: #f0f2f7; }
.light-theme ::-webkit-scrollbar-thumb { background: #d1d5db; }
/* ==========================================================================
8. LAYOUT — WRAPPER
========================================================================== */
#wrapper { overflow-x: hidden; }
/* ==========================================================================
9. SIDEBAR (V-NAV)
==========================================================================
Fixed 15rem sidebar. Mobile: hidden, slides in on toggle.
Desktop: visible by default, slides out on toggle.
========================================================================== */
#sidebar-wrapper {
background: var(--bg-sidebar) !important;
border-right: 1px solid var(--border-color) !important;
height: 100vh;
position: fixed;
top: 0; left: 0;
z-index: 1030;
overflow-y: auto;
margin-left: -15rem;
transition: margin 0.25s ease-out;
}
#sidebar-wrapper .sidebar-heading { padding: 0.875rem 1.25rem; font-size: 1.2rem; }
#sidebar-wrapper .list-group { width: 15rem; }
#page-content-wrapper {
min-width: 100vw;
display: flex;
flex-direction: column;
height: 100vh;
overflow-y: auto;
}
body.sb-sidenav-toggled #wrapper #sidebar-wrapper { margin-left: 0; }
@media (min-width: 768px) {
#sidebar-wrapper { margin-left: 0; }
#page-content-wrapper { min-width: 0; width: 100%; margin-left: 15rem; }
body.sb-sidenav-toggled #wrapper #sidebar-wrapper { margin-left: -15rem; }
body.sb-sidenav-toggled #page-content-wrapper { margin-left: 0; }
}
.sidebar-heading {
background: var(--bg-card) !important;
border-bottom: 1px solid var(--border-color) !important;
color: var(--text-primary) !important;
font-family: var(--font-display) !important;
font-weight: 600;
}
.sidebar-toggle-btn {
background: none; border: none;
color: var(--text-muted); cursor: pointer;
padding: 4px; border-radius: 4px;
transition: all 0.2s ease;
display: flex; align-items: center;
}
.sidebar-toggle-btn:hover { color: var(--accent); background: var(--accent-soft); }
.sidebar-restore-btn { display: none; }
@media (max-width: 767.98px) { .sidebar-restore-btn { display: inline-flex; } }
body.sb-sidenav-toggled .sidebar-restore-btn { display: inline-flex; }
.list-group-item {
background: transparent !important;
border-color: var(--border-color) !important;
color: var(--text-secondary) !important;
transition: all 0.2s ease;
font-size: 0.9rem;
letter-spacing: 0.02em;
}
.list-group-item:hover {
background: var(--accent-soft) !important;
color: var(--text-primary) !important;
}
.v-nav-active {
background: linear-gradient(135deg, var(--accent), #2563eb) !important;
color: #fff !important; font-weight: 500;
border-left: 3px solid var(--accent-secondary) !important;
box-shadow: 0 0 20px var(--accent-glow);
}
.v-nav-active:hover {
background: linear-gradient(135deg, #4b8ff7, #2563eb) !important;
color: #fff !important;
}
.v-nav-child {
font-size: 0.85rem;
opacity: 0.8;
transition: background 0.25s ease, color 0.25s ease, border-left-color 0.25s ease, opacity 0.2s ease;
}
.v-nav-child:hover { opacity: 1; }
.v-nav-child.v-nav-active,
.v-nav-parent.v-nav-active {
opacity: 1;
background: linear-gradient(135deg, var(--accent), #2563eb) !important;
color: #fff !important; font-weight: 500;
border-left: 3px solid var(--accent-secondary) !important;
box-shadow: 0 0 15px var(--accent-glow);
}
.v-nav-arrow { transition: transform 0.2s ease; color: var(--text-muted); }
.v-nav-parent[aria-expanded="true"] .v-nav-arrow {
transform: rotate(180deg); color: var(--accent);
}
.v-nav-section-label {
background: linear-gradient(135deg, #1a5c3a, #0e7a46) !important;
color: #fff !important; font-weight: 500;
border-left: 3px solid #34d399 !important;
box-shadow: 0 0 15px rgba(52, 211, 153, 0.25);
margin-top: 0.5rem;
}
.v-nav-section-label:hover {
background: linear-gradient(135deg, #1f6b44, #0e7a46) !important;
color: #fff !important;
}
.light-theme .v-nav-active { box-shadow: 0 0 12px rgba(37, 99, 235, 0.15); }
/* ==========================================================================
10. TOP NAV (H-NAV)
========================================================================== */
.navbar {
background: var(--bg-surface) !important;
border-bottom: 1px solid var(--border-color) !important;
backdrop-filter: blur(12px);
position: sticky; top: 0; z-index: 1020;
}
.navbar-brand-custom {
position: absolute; left: 50%; transform: translateX(-50%);
font-family: var(--font-display); font-weight: 700;
font-size: 1.15rem; color: var(--text-primary) !important;
text-decoration: none; letter-spacing: 0.5px;
text-shadow: 0 0 20px var(--accent-glow);
transition: color 0.2s ease, text-shadow 0.2s ease;
}
.navbar-brand-custom:hover {
color: var(--accent) !important;
text-shadow: 0 0 28px var(--accent-glow);
}
.light-theme .navbar-brand-custom { text-shadow: none; }
.navbar .btn-primary {
background: var(--accent-soft) !important;
border: 1px solid var(--border-glow) !important;
color: var(--accent) !important;
font-size: 0.85rem; font-weight: 500;
letter-spacing: 0.03em; transition: all 0.2s ease;
}
.navbar .btn-primary:hover {
background: var(--accent) !important;
color: #fff !important;
box-shadow: 0 0 15px var(--accent-glow);
}
.navbar .nav-link {
color: var(--text-secondary) !important;
font-size: 0.9rem; letter-spacing: 0.03em;
transition: color 0.2s ease;
}
.navbar .nav-link:hover { color: var(--text-primary) !important; }
.h-nav-active {
font-weight: 600 !important;
color: var(--accent) !important;
border-bottom: 2px solid var(--accent) !important;
text-shadow: 0 0 12px var(--accent-glow);
}
.light-theme .h-nav-active { text-shadow: none; }
.navbar-toggler { border-color: var(--border-color) !important; }
.navbar-toggler-icon { filter: invert(1) brightness(0.7); }
.light-theme .navbar-toggler-icon { filter: none; }
.dropdown-menu {
background: var(--bg-card) !important;
border: 1px solid var(--border-color) !important;
}
.dropdown-item { color: var(--text-secondary) !important; }
.dropdown-item:hover {
background: var(--accent-soft) !important;
color: var(--text-primary) !important;
}
.dropdown-divider { border-color: var(--border-color) !important; }
/* ==========================================================================
11. H-NAV TOOL BUTTONS (search, theme toggle, font controls)
========================================================================== */
.h-nav-tool-btn {
background: none; border: none; cursor: pointer;
font-size: 1.1rem; padding: 0.5rem 0.6rem; line-height: 1;
color: var(--text-secondary) !important;
transition: color 0.2s ease;
}
.h-nav-tool-btn:hover { color: var(--accent) !important; }
.font-size-controls {
display: inline-flex; align-items: center; gap: 2px;
margin: 0 0.4rem;
background: var(--accent-soft);
border-radius: 4px; padding: 2px;
}
.font-size-btn {
background: none; border: none; cursor: pointer;
color: var(--text-muted);
font-family: var(--font-body); font-weight: 500;
padding: 0.2rem 0.5rem; border-radius: 3px;
font-size: 0.8rem; line-height: 1.2;
transition: all 0.2s ease;
}
.font-size-btn:hover { color: var(--text-primary); }
.font-size-btn.font-size-active { background: var(--accent); color: #fff; }
/* ==========================================================================
12. PAGE TITLE / BRAND HEADER
========================================================================== */
.site-brand {
text-align: center;
padding: 2.5rem 1rem 2rem;
position: relative; overflow: hidden; z-index: 2;
margin-bottom: 0.5rem;
}
.site-brand::before {
content: '';
position: absolute; top: 50%; left: 50%;
transform: translate(-50%, -50%);
width: 250px; height: 150px;
background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
border-radius: 50%; pointer-events: none;
animation: brandPulse 4s ease-in-out infinite;
}
@keyframes brandPulse {
0%, 100% { opacity: 0.3; transform: translate(-50%, -50%) scale(1); }
50% { opacity: 0.6; transform: translate(-50%, -50%) scale(1.15); }
}
.site-brand-text {
position: relative;
font-family: var(--font-display);
font-weight: 700; font-size: 1.6rem;
letter-spacing: 0.15em; text-transform: uppercase;
color: var(--text-primary);
text-shadow: 0 0 30px var(--accent-glow), 0 0 60px rgba(59, 130, 246, 0.15);
}
.light-theme .site-brand-text { text-shadow: none; }
.site-brand-dot {
display: inline-block; width: 6px; height: 6px;
background: var(--accent); border-radius: 50%;
vertical-align: middle; margin: 0 2px;
box-shadow: 0 0 8px var(--accent-glow);
animation: dotFlicker 3s ease-in-out infinite;
}
@keyframes dotFlicker {
0%, 100% { opacity: 1; box-shadow: 0 0 8px var(--accent-glow); }
50% { opacity: 0.5; box-shadow: 0 0 16px var(--accent-glow), 0 0 30px rgba(59, 130, 246, 0.2); }
}
.site-brand-sub {
position: relative;
font-family: var(--font-body); font-weight: 300;
font-size: 0.75rem; letter-spacing: 0.35em;
color: var(--text-muted); text-transform: uppercase;
margin-top: 0.3rem;
}
/* ==========================================================================
13. HERO SECTION (home page — item #17)
==========================================================================
Full-viewport landing area. Gradient background, large headline, two
CTA buttons. The .hero-bg div provides a radial glow effect behind
the content. Only used on index.html.
========================================================================== */
.hero-section {
position: relative;
min-height: 85vh;
display: flex;
align-items: center;
justify-content: center;
text-align: center;
padding: 4rem 1.5rem;
overflow: hidden;
}
/* Radial glow effect behind the hero text */
.hero-bg {
position: absolute;
inset: 0;
background:
radial-gradient(ellipse at 30% 40%, rgba(59, 130, 246, 0.08) 0%, transparent 60%),
radial-gradient(ellipse at 70% 60%, rgba(6, 182, 212, 0.06) 0%, transparent 50%);
pointer-events: none;
}
.light-theme .hero-bg {
background:
radial-gradient(ellipse at 30% 40%, rgba(37, 99, 235, 0.06) 0%, transparent 60%),
radial-gradient(ellipse at 70% 60%, rgba(8, 145, 178, 0.04) 0%, transparent 50%);
}
.hero-content {
position: relative;
z-index: 2;
max-width: 720px;
}
/* Small caps label above the headline */
.hero-eyebrow {
font-family: var(--font-body);
font-weight: 500;
font-size: 0.85rem;
letter-spacing: 0.25em;
text-transform: uppercase;
color: var(--accent);
margin-bottom: 1rem;
}
/* Main headline — scales with viewport width */
.hero-headline {
font-family: var(--font-display) !important;
font-weight: 800;
font-size: clamp(2rem, 5.5vw, 3.5rem);
line-height: 1.15;
color: var(--text-primary);
margin-bottom: 1rem;
text-shadow: 0 0 40px var(--accent-glow);
}
.light-theme .hero-headline { text-shadow: none; }
.hero-sub {
font-size: 1.1rem;
color: var(--text-secondary);
max-width: 560px;
margin: 0 auto 2rem;
line-height: 1.7;
}
/* CTA button pair */
.hero-actions {
display: flex;
gap: 1rem;
justify-content: center;
flex-wrap: wrap;
}
.hero-btn {
display: inline-block;
padding: 0.75rem 1.75rem;
border-radius: 0.4rem;
font-family: var(--font-body);
font-size: 0.9rem;
font-weight: 500;
letter-spacing: 0.03em;
transition: all 0.25s ease;
text-decoration: none;
}
/* Primary CTA — filled accent blue */
.hero-btn-primary {
background: var(--accent);
color: #fff;
box-shadow: 0 4px 20px var(--accent-glow);
}
.hero-btn-primary:hover {
background: #2563eb;
color: #fff;
box-shadow: 0 6px 30px var(--accent-glow);
transform: translateY(-2px);
}
/* Secondary CTA — outlined / ghost button */
.hero-btn-secondary {
background: transparent;
color: var(--text-secondary);
border: 1px solid var(--border-color);
}
.hero-btn-secondary:hover {
background: var(--accent-soft);
color: var(--text-primary);
border-color: var(--border-glow);
}
/* ==========================================================================
14. NAVIGATION PATHWAY CARDS (home page — item #16)
==========================================================================
A 2×2 grid of clickable cards on the home page ("Choose Your Journey").
Each card has a data-accent attribute for subtle colour variation:
blue, amber, cyan, green.
========================================================================== */
.pathways-section {
padding: 3rem 0 4rem;
}
.pathways-title {
text-align: center;
font-size: 1.8rem;
margin-bottom: 0.5rem;
}
.pathways-sub {
text-align: center;
color: var(--text-muted);
font-size: 0.95rem;
margin-bottom: 2rem;
}
.pathways-grid {
display: grid;
grid-template-columns: repeat(2, 1fr);
gap: 1.25rem;
max-width: 800px;
margin: 0 auto;
}
@media (max-width: 575.98px) {
.pathways-grid { grid-template-columns: 1fr; }
}
.pathway-card {
display: flex;
flex-direction: column;
padding: 1.5rem;
background: var(--bg-card);
border: 1px solid var(--border-color);
border-radius: 0.75rem;
text-decoration: none;
color: var(--text-secondary);
transition: all 0.25s ease;
}
.pathway-card:hover {
transform: translateY(-4px);
box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3), 0 0 20px var(--accent-glow);
border-color: var(--border-glow);
color: var(--text-primary);
}
.light-theme .pathway-card:hover {
box-shadow: 0 12px 30px rgba(0, 0, 0, 0.08), 0 0 12px var(--accent-glow);
}
/* Icon (Unicode character or SVG) */
.pathway-icon {
font-size: 1.6rem;
color: var(--accent);
margin-bottom: 0.75rem;
}
/* Colour variations via data-accent */
.pathway-card[data-accent="amber"] .pathway-icon { color: #f59e0b; }
.pathway-card[data-accent="cyan"] .pathway-icon { color: #06b6d4; }
.pathway-card[data-accent="green"] .pathway-icon { color: #10b981; }
.pathway-card[data-accent="amber"]:hover { border-color: rgba(245, 158, 11, 0.3); }
.pathway-card[data-accent="cyan"]:hover { border-color: rgba(6, 182, 212, 0.3); }
.pathway-card[data-accent="green"]:hover { border-color: rgba(16, 185, 129, 0.3); }
.pathway-card-title {
font-family: var(--font-display);
font-weight: 600;
font-size: 0.95rem;
color: var(--text-primary);
margin-bottom: 0.5rem;
}
.pathway-card-desc {
font-size: 0.85rem;
line-height: 1.6;
}
/* ==========================================================================
15. READING TIME ESTIMATE
========================================================================== */
.reading-time {
text-align: center;
font-family: var(--font-body);
font-size: 0.8rem;
letter-spacing: 0.1em;
color: var(--text-muted);
padding: 0 1rem 1.5rem;
position: relative; z-index: 2;
}
/* ==========================================================================
16. BREADCRUMB NAVIGATION
==========================================================================
Horizontal bar below the h-nav showing position in site hierarchy.
Uses › as the separator, inserted via CSS ::before.
========================================================================== */
.breadcrumb-bar {
background: var(--bg-surface);
border-bottom: 1px solid var(--border-color);
padding: 0.5rem 1rem;
position: sticky;
top: var(--navbar-height, 56px); /* JS sets --navbar-height; 56px is Bootstrap default */
z-index: 1019; /* just below navbar (1020) */
backdrop-filter: blur(12px);
}
.breadcrumb-list {
list-style: none; margin: 0; padding: 0;
display: flex; flex-wrap: wrap; align-items: center;
font-family: var(--font-body); font-size: 0.8rem;
}
.breadcrumb-item { color: var(--text-muted); }
.breadcrumb-item + .breadcrumb-item::before {
content: '›'; padding: 0 0.5rem; color: var(--text-muted);
}
.breadcrumb-item a {
color: var(--accent); text-decoration: none;
transition: color 0.2s ease;
}
.breadcrumb-item a:hover { color: var(--text-primary); }
.breadcrumb-item.active { color: var(--text-secondary); }
/* Subtopic crumb — slightly brighter to show it's the current position */
.breadcrumb-subtopic {
color: var(--accent) !important;
font-weight: 500;
transition: opacity 0.2s ease;
}
.breadcrumb-subtopic:empty { display: none; }
/* ==========================================================================
17. MAIN CONTENT AREA
========================================================================== */
.main-content { flex-grow: 1; background: var(--bg-deep); }
/* ==========================================================================
18. VIDEO RESPONSIVE WRAPPER
========================================================================== */
.video-wrapper {
width: 100%; border-radius: 0.5rem;
overflow: hidden; background: #000;
}
.video-wrapper video,
.video-wrapper iframe {
display: block; width: 100%; aspect-ratio: 16 / 9;
}
/* ==========================================================================
19. FULL-WIDTH SECTIONS
========================================================================== */
.full-width-section {
width: 100%; padding: 2rem 0; margin-top: 0;
position: relative; z-index: 1;
}
.full-width-section:first-child { margin-top: 0; }
.full-width-section img { border-radius: 0; }
/* ==========================================================================
20. INTRO BLOCK
========================================================================== */
.intro-block {
text-align: center; padding: 4rem 1rem;
position: relative; overflow: hidden;
}
.intro-block::before {
content: '';
position: absolute; top: 0; left: 0; right: 0; bottom: 0;
background:
radial-gradient(ellipse at 20% 50%, rgba(59, 130, 246, 0.06) 0%, transparent 60%),
radial-gradient(ellipse at 80% 50%, rgba(6, 182, 212, 0.04) 0%, transparent 60%);
pointer-events: none;
}
.intro-label {
font-family: var(--font-body); font-weight: 500;
font-size: 0.8rem; letter-spacing: 0.25em;
text-transform: uppercase; color: var(--accent);
margin-bottom: 0.75rem; position: relative;
}
.intro-headline {
font-family: var(--font-display) !important;
font-weight: 800;
font-size: clamp(1.6rem, 4vw, 2.6rem);
line-height: 1.2; color: var(--text-primary);
margin-bottom: 1rem; position: relative;
}
.intro-desc {
font-size: 1rem; color: var(--text-secondary);
max-width: 680px; margin: 0 auto;
line-height: 1.8; position: relative;
}
/* ==========================================================================
21. CONTENT ROWS
========================================================================== */
.content-row { padding: 3rem 0; position: relative; }
.content-row img {
width: 100%; height: auto;
border-radius: 0.75rem;
border: 1px solid var(--border-color);
transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.content-row img:hover {
transform: translateY(-3px);
box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4), 0 0 20px var(--accent-glow);
}
.light-theme .content-row img { border-color: rgba(0, 0, 0, 0.10); }
.light-theme .content-row img:hover {
box-shadow: 0 12px 40px rgba(0, 0, 0, 0.10), 0 0 12px var(--accent-glow);
}
.content-row h2 {
font-size: 1.6rem; margin-bottom: 1rem;
position: relative; display: inline-block;
}
.content-row h2::after {
content: ''; display: block;
width: 40px; height: 2px;
background: linear-gradient(90deg, var(--accent), var(--accent-secondary));
margin-top: 0.5rem; border-radius: 2px;
}
.content-row .video-wrapper {
border: 1px solid var(--border-color);
box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}
.light-theme .content-row .video-wrapper { box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08); }
.row-alt { background: var(--bg-surface); }
/* Cursor hint for lightbox-enabled images */
.lightbox-img { cursor: zoom-in; }
/* ==========================================================================
22. TOPIC-SPECIFIC COLOUR ACCENTS (item #26)
==========================================================================
Each topic page sets data-topic-accent on via a tag and
the flash-prevention script. This subtly recolours the content-row h2
underline and a few decorative elements per topic, creating visual
identity without changing the overall palette.
========================================================================== */
[data-topic-accent="amber"] .content-row h2::after {
background: linear-gradient(90deg, #f59e0b, #d97706);
}
[data-topic-accent="cyan"] .content-row h2::after {
background: linear-gradient(90deg, #06b6d4, #0891b2);
}
[data-topic-accent="green"] .content-row h2::after {
background: linear-gradient(90deg, #10b981, #059669);
}
[data-topic-accent="earth"] .content-row h2::after {
background: linear-gradient(90deg, #a16207, #92400e);
}
[data-topic-accent="silver"] .content-row h2::after {
background: linear-gradient(90deg, #94a3b8, #64748b);
}
/* ==========================================================================
23. PULL QUOTES (item #12)
==========================================================================
Large, visually distinct blockquote used for key quotations. Features
a left border accent, larger italic text, and a cite element below.
========================================================================== */
.pull-quote {
margin: 2rem 0;
padding: 1.5rem 1.5rem 1.5rem 2rem;
border-left: 3px solid var(--accent);
background: var(--accent-soft);
border-radius: 0 0.5rem 0.5rem 0;
position: relative;
}
.pull-quote p {
font-family: var(--font-display);
font-size: 1.15rem;
font-weight: 500;
font-style: italic;
line-height: 1.6;
color: var(--text-primary);
margin-bottom: 0.5rem;
}
.pull-quote-cite {
display: block;
font-family: var(--font-body);
font-size: 0.85rem;
font-style: normal;
color: var(--text-muted);
letter-spacing: 0.02em;
}
/* ==========================================================================
24. CALLOUT BOXES (item #12)
==========================================================================
Three types: Key Insight (blue), Common Question (cyan), Caution (amber).
Each has a coloured left border, tinted background, and a label badge.
========================================================================== */
.callout {
margin: 1.5rem 0;
padding: 1.25rem 1.25rem 1.25rem 1.5rem;
border-radius: 0 0.5rem 0.5rem 0;
border-left: 3px solid var(--accent);
background: var(--accent-soft);
}
.callout p { margin-bottom: 0.5rem; }
.callout p:last-child { margin-bottom: 0; }
/* Label badge at the top of each callout */
.callout-label {
display: inline-block;
font-family: var(--font-body);
font-size: 0.7rem;
font-weight: 600;
letter-spacing: 0.1em;
text-transform: uppercase;
padding: 0.2rem 0.6rem;
border-radius: 3px;
margin-bottom: 0.75rem;
}
/* Key Insight — blue (default) */
.callout-insight {
border-left-color: var(--accent);
background: var(--accent-soft);
}
.callout-insight .callout-label {
background: var(--accent);
color: #fff;
}
/* Common Question — cyan */
.callout-question {
border-left-color: var(--accent-secondary);
background: rgba(6, 182, 212, 0.08);
}
.callout-question .callout-label {
background: var(--accent-secondary);
color: #fff;
}
/* Caution — amber (warns about speculative content) */
.callout-caution {
border-left-color: #f59e0b;
background: rgba(245, 158, 11, 0.08);
}
.callout-caution .callout-label {
background: #f59e0b;
color: #1a1f2e;
}
/* ==========================================================================
25. CONFIDENCE LEVEL BADGES (item #12)
==========================================================================
Small inline badges that visually communicate the evidence level of
a claim. Four levels with colour-coded backgrounds:
Established (green) — consensus science
Strong Evidence (blue) — well-supported but not consensus
Emerging (amber) — plausible, under investigation
Speculative (red) — logically coherent but unproven
========================================================================== */
.confidence-badge {
display: inline-block;
font-family: var(--font-body);
font-size: 0.7rem;
font-weight: 600;
letter-spacing: 0.08em;
text-transform: uppercase;
padding: 0.25rem 0.75rem;
border-radius: 3px;
margin-bottom: 0.75rem;
}
.confidence-established { background: #059669; color: #fff; }
.confidence-strong { background: var(--accent); color: #fff; }
.confidence-emerging { background: #f59e0b; color: #1a1f2e; }
.confidence-speculative { background: #dc2626; color: #fff; }
/* ==========================================================================
26. GLOSSARY TOOLTIPS (item #13)
==========================================================================
Terms wrapped in
get a dotted underline. On hover (desktop) or tap (mobile), a tooltip
appears below the term showing the definition. The tooltip is positioned
by JavaScript to avoid overflowing the viewport.
========================================================================== */
.glossary-term {
border-bottom: 1px dotted var(--accent);
cursor: help;
position: relative;
color: var(--text-primary);
}
/* The tooltip is a child injected by JavaScript on hover */
.glossary-tooltip {
position: absolute;
bottom: calc(100% + 8px);
left: 50%;
transform: translateX(-50%);
z-index: 100;
background: var(--bg-card);
color: var(--text-secondary);
border: 1px solid var(--border-color);
border-radius: 0.4rem;
padding: 0.6rem 0.8rem;
font-family: var(--font-body);
font-size: 0.8rem;
line-height: 1.5;
width: max-content;
max-width: 280px;
box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
pointer-events: none;
opacity: 0;
transition: opacity 0.15s ease;
}
.glossary-tooltip.visible { opacity: 1; }
/* Small arrow pointing down from tooltip to term */
.glossary-tooltip::after {
content: '';
position: absolute;
top: 100%;
left: 50%;
transform: translateX(-50%);
border: 6px solid transparent;
border-top-color: var(--bg-card);
}
.light-theme .glossary-tooltip {
box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}
/* ==========================================================================
27. GO DEEPER EXPANDABLE SECTIONS (item #25)
==========================================================================
Accordion-style progressive disclosure. The toggle button shows a +/-
icon and a descriptive label. Clicking it expands the hidden content
below. Multiple Go Deeper sections can exist on the same page.
========================================================================== */
.go-deeper {
margin: 1.5rem 0;
border: 1px solid var(--border-color);
border-radius: 0.5rem;
overflow: hidden;
}
.go-deeper-toggle {
display: flex;
align-items: center;
gap: 0.5rem;
width: 100%;
padding: 0.9rem 1.25rem;
background: var(--bg-card);
border: none;
color: var(--accent);
font-family: var(--font-body);
font-size: 0.9rem;
font-weight: 500;
cursor: pointer;
text-align: left;
transition: background 0.2s ease;
}
.go-deeper-toggle:hover { background: var(--accent-soft); }
/* The +/- icon rotates on expand */
.go-deeper-icon {
font-size: 1.1rem;
font-weight: 700;
transition: transform 0.2s ease;
flex-shrink: 0;
width: 1.2rem;
text-align: center;
}
/* Content is hidden by default; JS toggles max-height and aria-hidden */
.go-deeper-content {
max-height: 0;
overflow: hidden;
transition: max-height 0.3s ease;
padding: 0 1.25rem;
background: var(--bg-surface);
}
.go-deeper-content.expanded {
max-height: 2000px; /* large enough for any content */
padding: 1rem 1.25rem 1.25rem;
}
/* ==========================================================================
28. FOOTNOTES / SOURCE CITATIONS (item #30)
==========================================================================
Inline footnote references are superscript numbers ([1], [2]).
Hovering shows a tooltip with the full citation. The footnotes
section at the bottom lists all citations collected by JavaScript.
========================================================================== */
/* Inline superscript reference */
.footnote-ref {
font-size: 0.7rem;
color: var(--accent);
cursor: help;
position: relative;
vertical-align: super;
font-weight: 500;
margin-left: 1px;
}
.footnote-ref:hover { color: var(--text-primary); }
/* Footnote tooltip (shown on hover, positioned by JS) */
.footnote-tooltip {
position: absolute;
bottom: calc(100% + 6px);
left: 50%;
transform: translateX(-50%);
z-index: 100;
background: var(--bg-card);
color: var(--text-secondary);
border: 1px solid var(--border-color);
border-radius: 0.4rem;
padding: 0.6rem 0.8rem;
font-family: var(--font-body);
font-size: 0.75rem;
font-style: normal;
line-height: 1.5;
width: max-content;
max-width: 320px;
box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
pointer-events: none;
opacity: 0;
transition: opacity 0.15s ease;
}
.footnote-tooltip.visible { opacity: 1; }
/* Bottom-of-page footnotes list */
.footnotes-section {
padding: 2rem 0;
border-top: 1px solid var(--border-color);
background: var(--bg-surface);
}
.footnotes-heading {
font-size: 1.1rem;
margin-bottom: 1rem;
}
.footnotes-list {
padding-left: 1.5rem;
font-size: 0.8rem;
color: var(--text-muted);
line-height: 1.8;
}
.footnotes-list li {
margin-bottom: 0.5rem;
}
/* ==========================================================================
29. SOCIAL SHARING BUTTONS (item #14)
==========================================================================
Small row of share buttons that appear below section headings.
Each button triggers a JS action (copy URL, open share popup, etc.).
========================================================================== */
.share-buttons {
display: flex;
gap: 0.5rem;
flex-wrap: wrap;
margin-bottom: 1rem;
}
.share-btn {
display: inline-flex;
align-items: center;
gap: 0.3rem;
background: var(--bg-card);
border: 1px solid var(--border-color);
border-radius: 4px;
color: var(--text-muted);
font-family: var(--font-body);
font-size: 0.75rem;
padding: 0.3rem 0.6rem;
cursor: pointer;
transition: all 0.2s ease;
}
.share-btn:hover {
background: var(--accent-soft);
color: var(--accent);
border-color: var(--border-glow);
}
/* "Copied!" confirmation state */
.share-btn.copied {
background: #059669;
color: #fff;
border-color: #059669;
}
/* ==========================================================================
30. INTERACTIVE DIAGRAM PLACEHOLDERS (item #31)
==========================================================================
Structured placeholder boxes for future WebGL / D3.js / p5.js
interactive visualisations. Shows an icon, title, description,
and the technology required. Replaced with actual embeds later.
========================================================================== */
.interactive-placeholder {
margin: 1.5rem 0;
border: 2px dashed var(--border-color);
border-radius: 0.75rem;
background: var(--bg-card);
text-align: center;
padding: 3rem 2rem;
min-height: 250px;
display: flex;
align-items: center;
justify-content: center;
}
.interactive-placeholder-inner svg {
color: var(--text-muted);
margin-bottom: 1rem;
}
.interactive-placeholder-title {
font-family: var(--font-display);
font-weight: 600;
font-size: 1rem;
color: var(--text-primary);
margin-bottom: 0.3rem;
}
.interactive-placeholder-desc {
font-size: 0.85rem;
color: var(--text-secondary);
margin-bottom: 0.75rem;
}
.interactive-placeholder-tech {
font-size: 0.7rem;
color: var(--text-muted);
letter-spacing: 0.05em;
font-family: var(--font-body);
}
/* ==========================================================================
31. IMAGE LIGHTBOX (item #21)
==========================================================================
Full-screen overlay that shows a clicked image at full size.
Images with .lightbox-img class are clickable. Overlay fades in/out.
Close via the × button, clicking the backdrop, or pressing Escape.
========================================================================== */
.lightbox-overlay {
position: fixed;
inset: 0;
z-index: 9995;
background: rgba(0, 0, 0, 0.90);
display: flex;
align-items: center;
justify-content: center;
padding: 2rem;
opacity: 0;
visibility: hidden;
transition: opacity 0.25s ease, visibility 0.25s ease;
cursor: zoom-out;
}
.lightbox-overlay.lightbox-open {
opacity: 1;
visibility: visible;
}
.lightbox-close {
position: absolute;
top: 1rem; right: 1.5rem;
background: none; border: none;
color: #fff;
font-size: 2rem;
cursor: pointer;
z-index: 10;
opacity: 0.7;
transition: opacity 0.2s ease;
}
.lightbox-close:hover { opacity: 1; }
.lightbox-image {
max-width: 90vw;
max-height: 85vh;
object-fit: contain;
border-radius: 0.5rem;
cursor: default;
}
/* ==========================================================================
32. TABLE OF CONTENTS FLYOUT (item #32 — Option C: toggle button)
==========================================================================
A small "Contents" button fixed to the right edge of the content area.
Clicking it opens/closes a floating TOC panel that lists in-page section
headings. The list is auto-generated by JavaScript. The currently visible
section is highlighted via scroll-spy integration.
Mobile: button sits at bottom-right; panel floats above it.
Desktop: button sits at right edge; panel expands to the left.
========================================================================== */
/* Toggle button — always visible, anchored to right edge */
.toc-toggle-btn {
position: fixed;
right: 1rem;
top: 50%;
transform: translateY(-50%);
z-index: 1010;
background: var(--bg-card);
border: 1px solid var(--border-color);
border-radius: 0.4rem;
color: var(--text-muted);
cursor: pointer;
padding: 0.5rem 0.65rem;
display: flex;
align-items: center;
gap: 0.4rem;
font-family: var(--font-body);
font-size: 0.75rem;
font-weight: 500;
transition: all 0.2s ease;
box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
writing-mode: vertical-lr;
}
.toc-toggle-btn:hover {
background: var(--accent-soft);
color: var(--accent);
border-color: var(--border-glow);
}
.toc-toggle-btn[aria-expanded="true"] {
color: var(--accent);
border-color: var(--border-glow);
}
.toc-toggle-label {
writing-mode: vertical-lr;
letter-spacing: 0.08em;
}
/* TOC panel — floats next to the toggle button */
.page-toc {
position: fixed;
right: 3.5rem;
top: 50%;
transform: translateY(-50%);
z-index: 1009;
background: var(--bg-card);
border: 1px solid var(--border-color);
border-radius: 0.5rem;
padding: 1rem 1.25rem;
width: 220px;
max-height: 60vh;
overflow-y: auto;
box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
opacity: 0;
visibility: hidden;
transition: opacity 0.2s ease, visibility 0.2s ease;
}
.page-toc.toc-open {
opacity: 1;
visibility: visible;
}
.light-theme .page-toc {
box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}
.page-toc-heading {
font-family: var(--font-display);
font-weight: 600;
font-size: 0.75rem;
letter-spacing: 0.1em;
text-transform: uppercase;
color: var(--text-muted);
margin-bottom: 0.75rem;
padding-bottom: 0.5rem;
border-bottom: 1px solid var(--border-color);
}
.page-toc-list {
list-style: none;
padding: 0;
margin: 0;
}
.page-toc-item {
margin-bottom: 0.25rem;
}
.page-toc-link {
display: block;
padding: 0.3rem 0.5rem;
font-family: var(--font-body);
font-size: 0.8rem;
color: var(--text-muted);
text-decoration: none;
border-radius: 3px;
border-left: 2px solid transparent;
transition: all 0.15s ease;
}
.page-toc-link:hover {
color: var(--text-primary);
background: var(--accent-soft);
}
/* Active state — synced with scroll-spy */
.page-toc-link.toc-active {
color: var(--accent);
border-left-color: var(--accent);
font-weight: 500;
}
/* Mobile adjustments */
@media (max-width: 991.98px) {
.toc-toggle-btn {
top: auto;
bottom: 1.5rem;
right: 1rem;
transform: none;
writing-mode: horizontal-tb;
}
.toc-toggle-label { writing-mode: horizontal-tb; }
.page-toc {
right: 1rem;
top: auto;
bottom: 4.5rem;
transform: none;
}
}
/* ==========================================================================
33. PREVIOUS / NEXT NAVIGATION
========================================================================== */
.prev-next-nav {
display: flex;
justify-content: space-between;
align-items: stretch;
border-top: 1px solid var(--border-color);
border-bottom: 1px solid var(--border-color);
background: var(--bg-surface);
}
.prev-next-link {
display: flex; align-items: center; gap: 0.75rem;
padding: 1.25rem 1.5rem;
color: var(--text-secondary); text-decoration: none;
transition: background 0.2s ease, color 0.2s ease;
flex: 1;
}
.next-link { justify-content: flex-end; text-align: right; }
.prev-next-link:hover {
background: var(--accent-soft); color: var(--text-primary);
}
.prev-next-arrow { font-size: 1.4rem; color: var(--accent); flex-shrink: 0; }
.prev-next-text { display: flex; flex-direction: column; }
.prev-next-label {
font-size: 0.7rem; letter-spacing: 0.15em;
text-transform: uppercase; color: var(--text-muted);
font-family: var(--font-body);
}
.prev-next-title {
font-family: var(--font-display); font-weight: 600;
font-size: 0.95rem; color: var(--text-primary);
}
@media (max-width: 575.98px) {
.prev-next-nav { flex-direction: column; }
.next-link { border-top: 1px solid var(--border-color); }
}
/* ==========================================================================
34. SEARCH OVERLAY
========================================================================== */
.search-overlay {
position: fixed; inset: 0;
z-index: 9990;
background: rgba(10, 14, 26, 0.92);
backdrop-filter: blur(8px);
display: flex; align-items: flex-start; justify-content: center;
padding-top: 12vh;
opacity: 0; visibility: hidden;
transition: opacity 0.25s ease, visibility 0.25s ease;
}
.search-overlay.search-open { opacity: 1; visibility: visible; }
.light-theme .search-overlay { background: rgba(245, 247, 250, 0.92); }
.search-overlay-inner { width: 90%; max-width: 600px; position: relative; }
.search-close-btn {
position: absolute; top: -3rem; right: 0;
background: none; border: none;
color: var(--text-muted); cursor: pointer;
padding: 0.25rem; transition: color 0.2s ease;
}
.search-close-btn:hover { color: var(--text-primary); }
.search-input-wrapper { position: relative; margin-bottom: 1rem; }
.search-input-icon {
position: absolute; left: 1rem; top: 50%;
transform: translateY(-50%);
color: var(--text-muted); pointer-events: none;
}
.search-input {
width: 100%;
padding: 1rem 1rem 1rem 3rem;
font-family: var(--font-body); font-size: 1.1rem;
color: var(--text-primary);
background: var(--bg-card);
border: 1px solid var(--border-color);
border-radius: 0.5rem; outline: none;
transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.search-input:focus {
border-color: var(--accent);
box-shadow: 0 0 0 3px var(--accent-soft);
}
.search-input::placeholder { color: var(--text-muted); }
.search-results { max-height: 40vh; overflow-y: auto; }
.search-result-item {
display: block;
padding: 0.75rem 1rem;
color: var(--text-secondary);
background: var(--bg-card);
border: 1px solid var(--border-color);
border-top: none;
text-decoration: none;
transition: background 0.15s ease;
font-size: 0.9rem;
}
.search-result-item:first-child {
border-top: 1px solid var(--border-color);
border-radius: 0.5rem 0.5rem 0 0;
}
.search-result-item:last-child { border-radius: 0 0 0.5rem 0.5rem; }
.search-result-item:hover {
background: var(--accent-soft); color: var(--text-primary);
}
.search-result-title {
font-family: var(--font-display); font-weight: 600;
font-size: 0.95rem; color: var(--text-primary);
}
.search-result-path {
font-size: 0.75rem; color: var(--text-muted); margin-top: 0.15rem;
}
.search-no-results {
text-align: center; padding: 2rem 1rem;
color: var(--text-muted); font-size: 0.9rem;
}
.search-hint {
text-align: center; font-size: 0.75rem;
color: var(--text-muted); margin-top: 1rem;
}
.search-hint kbd {
background: var(--bg-elevated); color: var(--text-secondary);
padding: 0.15rem 0.4rem; border-radius: 3px;
font-family: var(--font-body); font-size: 0.7rem;
border: 1px solid var(--border-color);
}
/* ==========================================================================
35. FOOTER & NEWSLETTER (item #28)
========================================================================== */
.site-footer {
background: var(--bg-sidebar) !important;
border-top: 1px solid var(--border-color) !important;
color: var(--text-muted) !important;
}
/* Newsletter signup bar */
.footer-newsletter {
text-align: center;
padding: 2.5rem 1rem 2rem;
border-bottom: 1px solid var(--border-color);
}
.footer-newsletter-label {
font-family: var(--font-display);
font-weight: 600;
font-size: 1.1rem;
color: var(--text-primary);
margin-bottom: 0.3rem;
}
.footer-newsletter-desc {
font-size: 0.85rem;
color: var(--text-muted);
margin-bottom: 1rem;
}
.footer-newsletter-form {
display: flex;
gap: 0.5rem;
max-width: 400px;
margin: 0 auto;
}
.footer-newsletter-input {
flex: 1;
padding: 0.6rem 1rem;
background: var(--bg-card);
border: 1px solid var(--border-color);
border-radius: 0.4rem;
color: var(--text-primary);
font-family: var(--font-body);
font-size: 0.85rem;
outline: none;
transition: border-color 0.2s ease;
}
.footer-newsletter-input:focus {
border-color: var(--accent);
}
.footer-newsletter-input::placeholder { color: var(--text-muted); }
.footer-newsletter-btn {
padding: 0.6rem 1.25rem;
background: var(--accent);
color: #fff;
border: none;
border-radius: 0.4rem;
font-family: var(--font-body);
font-size: 0.85rem;
font-weight: 500;
cursor: pointer;
transition: background 0.2s ease;
}
.footer-newsletter-btn:hover { background: #2563eb; }
.footer-newsletter-note {
font-size: 0.7rem;
color: var(--text-muted);
margin-top: 0.5rem;
}
/* Bottom bar */
.footer-bottom {
padding: 1.25rem 0;
}
.footer-copyright {
font-size: 0.8rem;
color: var(--text-muted);
}
.footer-links {
display: flex;
gap: 1rem;
flex-wrap: wrap;
}
.footer-links a {
font-size: 0.75rem;
color: var(--text-muted);
transition: color 0.2s ease;
}
.footer-links a:hover { color: var(--accent); }
.footer-tagline {
font-size: 0.7rem;
color: var(--text-muted);
letter-spacing: 0.1em;
}
/* ==========================================================================
36. AMBIENT FLOATING PARTICLES
========================================================================== */
.ambient-particles {
position: fixed; top: 0; left: 0; right: 0; bottom: 0;
pointer-events: none; z-index: 0; overflow: hidden;
}
.ambient-particles span {
position: absolute; width: 2px; height: 2px;
background: rgba(59, 130, 246, 0.3);
border-radius: 50%;
animation: float linear infinite;
}
.ambient-particles span:nth-child(1) { left: 10%; top: 20%; animation-duration: 18s; animation-delay: 0s; }
.ambient-particles span:nth-child(2) { left: 30%; top: 60%; animation-duration: 22s; animation-delay: -4s; width: 3px; height: 3px; }
.ambient-particles span:nth-child(3) { left: 55%; top: 10%; animation-duration: 20s; animation-delay: -8s; }
.ambient-particles span:nth-child(4) { left: 75%; top: 40%; animation-duration: 25s; animation-delay: -2s; width: 1.5px; height: 1.5px; background: rgba(6, 182, 212, 0.25); }
.ambient-particles span:nth-child(5) { left: 90%; top: 70%; animation-duration: 19s; animation-delay: -6s; }
.ambient-particles span:nth-child(6) { left: 45%; top: 85%; animation-duration: 24s; animation-delay: -10s; background: rgba(6, 182, 212, 0.2); }
@keyframes float {
0% { transform: translateY(0) translateX(0); opacity: 0; }
10% { opacity: 1; }
90% { opacity: 1; }
100% { transform: translateY(-100vh) translateX(30px); opacity: 0; }
}
.light-theme .ambient-particles span { background: rgba(37, 99, 235, 0.15); }
.light-theme .ambient-particles span:nth-child(4) { background: rgba(8, 145, 178, 0.12); }
.light-theme .ambient-particles span:nth-child(6) { background: rgba(8, 145, 178, 0.10); }
/* ==========================================================================
37. SCROLL-TRIGGERED FADE-IN ANIMATION
========================================================================== */
.fade-in-section {
opacity: 0; transform: translateY(25px);
transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}
.fade-in-section.visible { opacity: 1; transform: translateY(0); }
/* ==========================================================================
38. SCROLL-SPY ACTIVE HIGHLIGHT
========================================================================== */
/* Base scroll-spy style (for any element that gets this class) */
.scroll-spy-active {
background: var(--accent-soft) !important;
color: var(--text-primary) !important;
border-left: 3px solid var(--accent) !important;
font-weight: 500;
}
/* Enhanced style specifically for sidebar subtopic links:
combines accent bar + background glow + bold text */
.v-nav-child.scroll-spy-active {
background: linear-gradient(90deg,
rgba(59, 130, 246, 0.18),
rgba(59, 130, 246, 0.06) 70%,
transparent) !important;
color: var(--accent) !important;
font-weight: 600 !important;
border-left: 3px solid var(--accent) !important;
box-shadow: inset 0 0 12px rgba(59, 130, 246, 0.08),
0 0 8px rgba(59, 130, 246, 0.05);
display: flex !important;
align-items: center;
opacity: 1 !important;
position: relative;
}
/* Small glowing dot indicator before the active subtopic text */
.v-nav-child.scroll-spy-active::before {
content: '';
display: inline-block;
width: 6px;
height: 6px;
border-radius: 50%;
background: var(--accent);
box-shadow: 0 0 6px var(--accent-glow);
margin-right: 8px;
flex-shrink: 0;
vertical-align: middle;
}
/* Light theme adjustments */
.light-theme .v-nav-child.scroll-spy-active {
background: linear-gradient(90deg,
rgba(37, 99, 235, 0.12),
rgba(37, 99, 235, 0.04) 70%,
transparent) !important;
color: var(--accent) !important;
box-shadow: inset 0 0 12px rgba(37, 99, 235, 0.06),
0 0 8px rgba(37, 99, 235, 0.03);
}
/* ==========================================================================
39. BOOTSTRAP OVERRIDES
========================================================================== */
.bg-light { background-color: var(--bg-surface) !important; }
.bg-dark { background-color: var(--bg-deep) !important; }
/* ==========================================================================
40. VISIBLE FOCUS INDICATORS (accessibility)
==========================================================================
Uses :focus-visible so outlines only appear on keyboard navigation,
not on mouse clicks.
========================================================================== */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[role="button"]:focus-visible {
outline: 2px solid var(--accent);
outline-offset: 2px;
}
.list-group-item:focus-visible {
outline: 2px solid var(--accent);
outline-offset: -2px;
}
/* ==========================================================================
41. REDUCED MOTION (accessibility)
==========================================================================
Respects OS-level prefers-reduced-motion setting. Disables all
animations and transitions for users with vestibular disorders.
========================================================================== */
@media (prefers-reduced-motion: reduce) {
.fade-in-section { opacity: 1; transform: none; transition: none; }
.ambient-particles span { animation: none; opacity: 0.4; }
.site-brand::before { animation: none; opacity: 0.3; }
.site-brand-dot { animation: none; opacity: 1; }
.progress-bar-fill { transition: none; }
.content-row img { transition: none; }
.pathway-card { transition: none; }
.hero-btn { transition: none; }
.go-deeper-content { transition: none; }
.lightbox-overlay { transition: none; }
.search-overlay { transition: none; }
.page-toc { transition: none; }
.skip-to-content { transition: none; }
.glossary-tooltip { transition: none; }
.sidebar-toggle-btn,
.navbar .btn-primary,
.navbar .nav-link,
.list-group-item,
.v-nav-arrow,
.navbar-brand-custom,
.prev-next-link,
.h-nav-tool-btn,
.font-size-btn,
.search-input,
.breadcrumb-item a,
.share-btn,
.footer-newsletter-input,
.footer-newsletter-btn,
.footer-links a,
.toc-toggle-btn,
.page-toc-link,
.go-deeper-toggle,
.lightbox-close {
transition: none;
}
}