/* 
========================================================================
   GEOSPATIAL RESEARCH & KNOWLEDGE SOCIETY (GrKs) - STYLE SYSTEM
   Features: Light & Dark Theme Switcher, Fluid Grid, Glowing Accents,
             Interactive Carousel & Satellite Slider, Custom Map Panels
========================================================================
*/

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@300;400;500;600;700;800&display=swap');

:root {
    /* Color Tokens - Light Theme Default */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --bg-navbar: #ffffff;
    
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    
    --border-color: #e2e8f0;
    
    --primary: #0d9488; /* Emerald 600 */
    --primary-hover: #0f766e; /* Emerald 700 */
    --primary-light: #ccfbf1; /* Emerald 100 */
    --primary-glow: rgba(13, 148, 136, 0.2);
    
    --secondary: #06b6d4; /* Cyan 500 */
    --secondary-hover: #0891b2; /* Cyan 600 */
    --secondary-light: #cffafe; /* Cyan 100 */
    
    --accent: #3b82f6; /* Blue 500 */
    --accent-gold: #f59e0b; /* Amber 500 */
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
    --shadow-glow: 0 0 15px rgba(13, 148, 136, 0.15);
    
    --border-radius-sm: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 16px;
    
    --font-sans: 'Inter', sans-serif;
    --font-heading: 'Outfit', sans-serif;
    
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    --header-height: 80px;

    /* Theme-aware Page Banner variables - Premium Spatial Grid Theme */
    --banner-bg-color: #0b1329;
    --banner-bg: radial-gradient(circle at 80% 20%, rgba(20, 184, 166, 0.18) 0%, transparent 50%), radial-gradient(circle at 20% 80%, rgba(59, 130, 246, 0.12) 0%, transparent 50%), linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    --banner-text: #ffffff;
    --banner-subtitle: #94a3b8;
    --banner-border: rgba(13, 148, 136, 0.2);
}

/* Dark Theme Overrides */
body.dark-theme {
    --bg-primary: #0b0f19; /* Deep Obsidian */
    --bg-secondary: #111827; /* Dark Slate */
    --bg-tertiary: #1f2937;
    --bg-navbar: #0b0f19;
    
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    
    --border-color: #1f2937;
    
    --primary: #0d9488; 
    --primary-hover: #14b8a6; /* Glowing Teal */
    --primary-light: rgba(13, 148, 136, 0.15);
    --primary-glow: rgba(13, 148, 136, 0.4);
    
    --secondary: #06b6d4;
    --secondary-hover: #22d3ee;
    --secondary-light: rgba(6, 182, 212, 0.15);
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.25), 0 2px 4px -1px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.35), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 0 20px rgba(13, 148, 136, 0.35);

    /* Dark Theme Page Banner overrides - Premium Spatial Grid Theme */
    --banner-bg-color: #050a14;
    --banner-bg: radial-gradient(circle at 80% 20%, rgba(20, 184, 166, 0.15) 0%, transparent 50%), radial-gradient(circle at 20% 80%, rgba(59, 130, 246, 0.1) 0%, transparent 50%), linear-gradient(rgba(255, 255, 255, 0.015) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
    --banner-text: #ffffff;
    --banner-subtitle: #6b7280;
    --banner-border: rgba(13, 148, 136, 0.15);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px; /* Base font size set to 16px for standard browser layout scale */
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--text-primary);
    font-weight: 700;
    line-height: 1.25;
}

h1 { font-size: 2.75rem; letter-spacing: -0.025em; }
h2 { font-size: 2rem; letter-spacing: -0.02em; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.2rem; }

p {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 1.25rem;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

/* Utility Layouts */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
    width: 100%;
}

@media (min-width: 1200px) {
    .container {
        max-width: 1360px;
    }
}

@media (min-width: 1600px) {
    .container {
        max-width: 1560px;
    }
}

.section {
    padding: 80px 0;
}

.section-light {
    background-color: var(--bg-secondary);
}

.section-title-wrapper {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 50px auto;
}

.section-subtitle {
    text-transform: uppercase;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: 0.1em;
    margin-bottom: 10px;
    display: inline-block;
}

.section-title {
    margin-bottom: 16px;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    margin: 12px auto 0 auto;
    border-radius: 2px;
}

/* Button & UI elements */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.95rem;
    border-radius: var(--border-radius-sm);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #ffffff;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
    color: #ffffff;
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--border-color);
    transform: translateY(-2px);
}

.badge {
    display: inline-block;
    padding: 4px 12px;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 50px;
    background-color: var(--primary-light);
    color: var(--primary);
    text-transform: uppercase;
}

/* Header & Navigation */
.header {
    height: var(--header-height);
    background-color: var(--bg-navbar);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: all var(--transition-normal);
}

.header .container {
    max-width: 1550px;
    width: 95%;
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--text-primary);
}

.logo svg {
    fill: none;
    stroke: var(--primary);
    stroke-width: 2;
    animation: rotateGlobe 12s linear infinite;
}

@keyframes rotateGlobe {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.logo-text span,
.footer-logo span {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Navigation Links */
.nav-menu {
    display: flex;
    list-style: none;
    gap: 20px; /* Increased gap for perfect breathing room */
    align-items: center;
}

.nav-item {
    position: relative;
}

.nav-link {
    color: var(--text-secondary);
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.82rem; /* Adjusted relatively for 20px root base */
    padding: 8px 12px;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    gap: 4px;
    white-space: nowrap; /* Ensures no navigation text wrapping */
}

.nav-link:hover, .nav-item.active .nav-link {
    color: var(--primary);
    background-color: var(--primary-light);
}

/* Dropdown Menu styling */
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-lg);
    padding: 8px 0;
    min-width: 220px;
    list-style: none;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-fast);
    z-index: 1001;
}

.nav-item:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item a {
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    padding: 10px 16px;
    display: block;
}

.dropdown-item a:hover {
    color: var(--primary);
    background-color: var(--primary-light);
}

/* Header Utilities */
.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* Theme Switcher Toggle */
.theme-switch {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8px;
    border-radius: 50px;
    background-color: var(--bg-tertiary);
    transition: all var(--transition-fast);
}

.theme-switch:hover {
    background-color: var(--border-color);
    color: var(--primary);
}

.theme-switch .sun-icon {
    display: block;
}
.theme-switch .moon-icon {
    display: none;
}

body.dark-theme .theme-switch .sun-icon {
    display: none;
}
body.dark-theme .theme-switch .moon-icon {
    display: block;
}

/* Responsive Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 6px;
    border: none;
    background: none;
    cursor: pointer;
    padding: 4px;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

/* Hero Section */
.hero {
    padding-top: calc(var(--header-height) + 40px);
    padding-bottom: 80px;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    position: relative;
    overflow: hidden;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 75% 50%, rgba(255, 255, 255, 0.4) 0%, var(--bg-primary) 80%);
    z-index: 1;
}

body.dark-theme .hero-overlay {
    background: radial-gradient(circle at 75% 50%, rgba(13, 148, 136, 0.1) 0%, var(--bg-primary) 80%);
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 650px;
}

@media (min-width: 992px) {
    .hero-content {
        margin-left: -50px; /* Shift content slightly more to the left for better screen balance */
    }
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 20px;
    letter-spacing: -0.03em;
}

.hero-title span {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-text {
    font-size: 1.15rem;
    line-height: 1.7;
    margin-bottom: 30px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
}

/* Interactive Remote Sensing Carousel */
.carousel-section {
    padding: 60px 0;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.carousel-container {
    max-width: 1000px;
    margin: 0 auto;
    position: relative;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    aspect-ratio: 16 / 9;
}

.carousel-slides {
    position: relative;
    width: 100%;
    height: 100%;
}

.carousel-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.8s ease, visibility 0.8s ease;
    display: flex;
    flex-direction: column;
}

.carousel-slide.active {
    opacity: 1;
    visibility: visible;
    z-index: 10;
}

.carousel-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Before/After Satellite Comparison Slider */
.slider-compare-container {
    position: relative;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.slider-before, .slider-after {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.slider-before img, .slider-after img {
    width: 1000px; /* Force consistent size matching parent container width */
    height: 100%;
    object-fit: cover;
    display: block;
}

.slider-before {
    z-index: 2;
    width: 50%; /* Default dividing line in middle */
    overflow: hidden;
}

.slider-after {
    z-index: 1;
}

.slider-handle {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 4px;
    background-color: #ffffff;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
    z-index: 3;
    cursor: ew-resize;
    transform: translateX(-50%);
}

.slider-handle-button {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 44px;
    height: 44px;
    background-color: var(--primary);
    color: #ffffff;
    border-radius: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 15px rgba(13, 148, 136, 0.5);
    font-size: 1.2rem;
    pointer-events: none;
}

.slider-label {
    position: absolute;
    bottom: 20px;
    padding: 6px 14px;
    background-color: rgba(15, 23, 42, 0.75);
    color: #ffffff;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.8rem;
    border-radius: var(--border-radius-sm);
    z-index: 4;
}

.slider-label-before {
    left: 20px;
}

.slider-label-after {
    right: 20px;
}

/* Carousel Overlay details */
.carousel-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(15, 23, 42, 0.9));
    padding: 30px 40px;
    color: #ffffff;
    z-index: 5;
}

.carousel-slide-title {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 6px;
    color: #ffffff;
}

.carousel-slide-desc {
    color: #cbd5e1;
    font-size: 0.9rem;
    margin-bottom: 0;
}

/* Carousel Nav Controls */
.carousel-control {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background-color: rgba(255, 255, 255, 0.2);
    border: none;
    color: #ffffff;
    width: 44px;
    height: 44px;
    border-radius: 50px;
    cursor: pointer;
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
    transition: all var(--transition-fast);
}

.carousel-control:hover {
    background-color: var(--primary);
    box-shadow: var(--shadow-glow);
}

.carousel-control-prev {
    left: 20px;
}

.carousel-control-next {
    right: 20px;
}

.carousel-dots {
    position: absolute;
    top: 20px;
    right: 20px;
    display: flex;
    gap: 8px;
    z-index: 20;
}

.carousel-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.4);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.carousel-dot.active {
    background-color: var(--primary);
    transform: scale(1.3);
}

/* Grid Layouts & Cards */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 30px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

.card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 30px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 0;
    background: linear-gradient(180deg, var(--primary), var(--secondary));
    transition: all var(--transition-normal);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    border-color: rgba(13, 148, 136, 0.3);
}

.card:hover::before {
    height: 100%;
}

.card-icon {
    font-size: 2.25rem;
    color: var(--primary);
    margin-bottom: 20px;
    display: inline-block;
}

.card-icon svg {
    width: 2.25rem;
    height: 2.25rem;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
    vertical-align: middle;
}

.card-title {
    margin-bottom: 12px;
}

/* Founder Blockquote Section */
.founder-section {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.founder-wrapper {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 40px;
    align-items: center;
}

.founder-profile {
    text-align: center;
}

.founder-avatar {
    width: 180px;
    height: 180px;
    border-radius: 100px;
    object-fit: cover;
    margin: 0 auto 20px auto;
    border: 4px solid var(--primary-light);
    box-shadow: var(--shadow-md);
}

.founder-name {
    font-size: 1.25rem;
    margin-bottom: 4px;
}

.founder-title {
    color: var(--text-muted);
    font-size: 0.85rem;
    text-transform: uppercase;
    font-weight: 600;
}

.founder-quote {
    position: relative;
}

.founder-quote blockquote {
    font-size: 1.15rem;
    font-style: italic;
    color: var(--text-secondary);
    border-left: 4px solid var(--primary);
    padding-left: 24px;
    margin-bottom: 20px;
}

/* Statistics Counter Grid */
.stats-section {
    background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-primary));
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    text-align: center;
    gap: 30px;
}

.stat-number {
    font-family: var(--font-heading);
    font-size: 3rem;
    font-weight: 800;
    color: var(--primary);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 8px;
}

.stat-label {
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

/* Accordions (Applications and Who Benefits) */
.accordion {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    overflow: hidden;
    background-color: var(--bg-secondary);
    margin-bottom: 12px;
}

.accordion-header {
    padding: 20px 24px;
    background-color: var(--bg-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-weight: 600;
    transition: all var(--transition-fast);
}

.accordion-header:hover {
    background-color: var(--bg-tertiary);
    color: var(--primary);
}

.accordion-header .icon-arrow {
    transition: transform var(--transition-fast);
}

.accordion.active .accordion-header {
    background-color: var(--primary-light);
    color: var(--primary);
}

.accordion.active .accordion-header .icon-arrow {
    transform: rotate(180deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal) ease-out;
    padding: 0 24px;
}

.accordion.active .accordion-content {
    max-height: 500px;
    padding: 20px 24px;
    border-top: 1px solid var(--border-color);
}

/* Dynamic Leaflet Interactive Map Card Dashboard */
.map-container {
    height: 480px;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    z-index: 10;
}

/* Tutorial Layout: Core Reading Mode */
.reading-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 40px;
    margin-top: 40px;
}

.sidebar-nav {
    position: sticky;
    top: calc(var(--header-height) + 20px);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 20px;
    max-height: calc(100vh - var(--header-height) - 40px);
    overflow-y: auto;
}

.sidebar-title {
    font-size: 0.9rem;
    text-transform: uppercase;
    color: var(--text-muted);
    font-weight: 700;
    letter-spacing: 0.05em;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.sidebar-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: 8px 12px;
    border-radius: var(--border-radius-sm);
    display: block;
}

.sidebar-link:hover, .sidebar-link.active {
    color: var(--primary);
    background-color: var(--primary-light);
}

.reading-content {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 40px;
    box-shadow: var(--shadow-sm);
}

.reading-content section {
    display: none;
}

.reading-content section.active {
    display: block;
}

.reading-content h2 {
    margin-top: 30px;
    margin-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
}

.reading-content h3 {
    margin-top: 24px;
    margin-bottom: 12px;
}

.reading-content ul, .reading-content ol {
    margin-bottom: 20px;
    padding-left: 20px;
}

.reading-content li {
    margin-bottom: 8px;
    color: var(--text-secondary);
}

/* Callout Box / Alert Panels */
.callout {
    padding: 20px;
    border-radius: var(--border-radius-md);
    border-left: 4px solid var(--primary);
    background-color: var(--bg-tertiary);
    margin-bottom: 20px;
}

.callout-info { border-left-color: var(--accent); }
.callout-warning { border-left-color: var(--accent-gold); }

/* Code Blocks Styling */
.code-header {
    background-color: #1e293b;
    padding: 10px 20px;
    border-top-left-radius: var(--border-radius-md);
    border-top-right-radius: var(--border-radius-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #334155;
}

.code-lang {
    color: #94a3b8;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.8rem;
}

.code-copy-btn {
    background: none;
    border: none;
    color: #94a3b8;
    cursor: pointer;
    font-size: 0.8rem;
}

.code-copy-btn:hover { color: #f8fafc; }

pre {
    background-color: #0f172a;
    padding: 20px;
    border-bottom-left-radius: var(--border-radius-md);
    border-bottom-right-radius: var(--border-radius-md);
    overflow-x: auto;
    margin-bottom: 20px;
    box-shadow: var(--shadow-md);
}

code {
    font-family: monospace;
    font-size: 0.9rem;
    color: #f8fafc;
}

/* Form Styles */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-weight: 600;
    font-family: var(--font-heading);
    font-size: 0.9rem;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.95rem;
    transition: all var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

textarea.form-control {
    resize: vertical;
    min-height: 120px;
}

/* Search Box resource styles */
.search-box-wrapper {
    display: flex;
    gap: 12px;
    margin-bottom: 30px;
    max-width: 600px;
}

.search-box-wrapper .form-control {
    border-radius: var(--border-radius-md);
}

/* Donation Progress & Grid Details */
.donation-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.donation-box {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-md);
}

.bank-detail-card {
    background-color: var(--bg-tertiary);
    border-radius: var(--border-radius-md);
    padding: 24px;
    border: 1px dashed var(--border-color);
    margin-top: 20px;
}

.bank-detail-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 12px;
    font-size: 0.95rem;
}

.bank-detail-row:last-child { margin-bottom: 0; }
.bank-label { font-weight: 600; color: var(--text-secondary); }
.bank-value { font-family: monospace; font-weight: 700; color: var(--text-primary); }

/* Table Styling for Universities and Datasets */
.table-wrapper {
    width: 100%;
    overflow-x: auto;
    border-radius: var(--border-radius-md);
    border: 1px solid var(--border-color);
    margin-bottom: 30px;
    box-shadow: var(--shadow-sm);
}

table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    background-color: var(--bg-secondary);
}

th, td {
    padding: 16px 20px;
}

th {
    background-color: var(--bg-tertiary);
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

td {
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
    font-size: 0.95rem;
}

tr:last-child td {
    border-bottom: none;
}

tr:hover td {
    background-color: var(--bg-tertiary);
}

/* Footer styling */
.footer {
    background-color: #0f172a;
    color: #94a3b8;
    padding: 80px 0 30px 0;
    border-top: 1px solid #1e293b;
}

body.dark-theme .footer {
    background-color: #030712;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    margin-bottom: 50px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.5rem;
    color: #ffffff;
    margin-bottom: 20px;
}

.footer-logo svg {
    fill: none;
    stroke: var(--primary);
    stroke-width: 2;
    animation: rotateGlobe 12s linear infinite;
}

.footer-desc {
    color: #64748b;
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.footer-title {
    color: #ffffff;
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 20px;
    position: relative;
}

.footer-title::after {
    content: '';
    display: block;
    width: 30px;
    height: 2px;
    background-color: var(--primary);
    margin-top: 8px;
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    color: #94a3b8;
    font-size: 0.9rem;
}

.footer-links a:hover {
    color: #ffffff;
    transform: translateX(4px);
    display: inline-block;
}

.footer-newsletter p {
    color: #64748b;
    font-size: 0.9rem;
}

.newsletter-form {
    display: flex;
    gap: 8px;
    margin-top: 12px;
}

.newsletter-form .form-control {
    background-color: #1e293b;
    border-color: #334155;
    color: #ffffff;
    border-radius: var(--border-radius-sm);
}

.newsletter-form .form-control:focus {
    border-color: var(--primary);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 30px;
    border-top: 1px solid #1e293b;
    font-size: 0.85rem;
    color: #64748b;
}

.footer-bottom-links {
    display: flex;
    gap: 20px;
}

.footer-bottom-links a {
    color: #64748b;
}

.footer-bottom-links a:hover {
    color: #ffffff;
}

/* Animations using IntersectionObserver trigger */
.fade-up {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Dynamic Tab System for About Page */
.tabs-header {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 12px 24px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    font-family: var(--font-heading);
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

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

.tab-btn.active {
    background-color: var(--primary);
    color: #ffffff;
    border-color: var(--primary);
    box-shadow: var(--shadow-glow);
}

.tab-panel {
    display: none;
    animation: fadeIn 0.4s ease-in-out;
}

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

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

/* Responsive Overrides */
@media (max-width: 1024px) {
    h1 { font-size: 2.25rem; }
    .reading-layout {
        grid-template-columns: 1fr;
    }
    .sidebar-nav {
        position: static;
        max-height: none;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .founder-wrapper {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .founder-quote blockquote {
        border-left: none;
        border-top: 3px solid var(--primary);
        padding-left: 0;
        padding-top: 20px;
    }
    .hamburger {
        display: flex;
    }
    .nav-menu {
        position: fixed;
        top: var(--header-height);
        left: -100%;
        width: 100%;
        height: calc(100vh - var(--header-height));
        background-color: var(--bg-secondary);
        flex-direction: column;
        align-items: stretch;
        padding: 24px;
        gap: 12px;
        box-shadow: var(--shadow-lg);
        transition: left var(--transition-normal);
        z-index: 999;
        overflow-y: auto;
    }
    .nav-menu.active {
        left: 0;
    }
    .nav-item:hover .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        border: none;
        padding-left: 20px;
    }
    .donation-grid {
        grid-template-columns: 1fr;
    }
    .hero-title {
        font-size: 2.5rem;
    }
    .hero-buttons {
        flex-direction: column;
    }
}

/* Technical Services Grid & Styling helpers */
.service-sub-card {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 20px;
    margin-top: 15px;
}

.service-sub-card h4 {
    margin-bottom: 8px;
    color: var(--primary);
    font-size: 1rem;
}

.service-tags-container {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 10px;
    margin-bottom: 15px;
}

.service-tag-item {
    font-size: 0.75rem;
    font-weight: 500;
    padding: 3px 8px;
    border-radius: 4px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.service-cols-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    margin-top: 15px;
}

@media (max-width: 768px) {
    .service-cols-3 {
        grid-template-columns: 1fr;
    }
}

.service-col-title {
    font-weight: 700;
    font-size: 0.85rem;
    text-transform: uppercase;
    color: var(--text-primary);
    margin-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 4px;
}

.service-col-list {
    list-style: none;
    padding-left: 0;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.service-col-list li {
    margin-bottom: 6px;
    position: relative;
    padding-left: 12px;
}

.service-col-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary);
}

/* 
========================================================================
   PAGE BANNER COMPONENT
   A premium theme-aware geospatial grid header for subpages with glowing effects
========================================================================
*/
.page-banner {
    position: relative;
    padding-top: 140px;
    padding-bottom: 60px;
    background-color: var(--banner-bg-color) !important;
    background-image: var(--banner-bg) !important;
    background-size: 100% 100%, 100% 100%, 30px 30px, 30px 30px !important;
    color: var(--banner-text) !important;
    text-align: center;
    overflow: hidden;
    border-bottom: 1px solid var(--banner-border) !important;
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.page-banner .container {
    position: relative;
    z-index: 2;
}

.page-banner h1 {
    color: var(--banner-text) !important;
    font-size: 2.25rem !important;
    font-weight: 800 !important;
    margin-top: 10px !important;
    margin-bottom: 0 !important;
    letter-spacing: -0.02em !important;
    font-family: var(--font-heading) !important;
    transition: color var(--transition-normal);
}

.page-banner p {
    color: var(--banner-subtitle) !important;
    font-size: 1.05rem !important;
    max-width: 650px !important;
    margin: 15px auto 0 auto !important;
    line-height: 1.6 !important;
    transition: color var(--transition-normal);
}

.page-banner .badge {
    display: inline-block !important;
    padding: 4px 12px !important;
    font-size: 0.75rem !important;
    font-weight: 600 !important;
    border-radius: 50px !important;
    text-transform: uppercase !important;
    letter-spacing: 0.05em !important;
}

/* ========================================================================
   DOWNLOAD CENTER AND GOOGLE DRIVE INTEGRATION STYLES
   ======================================================================== */

.download-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 24px;
    margin-bottom: 16px;
    box-shadow: var(--shadow-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 24px;
    transition: all var(--transition-normal);
}

.download-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md), var(--shadow-glow);
    border-color: rgba(13, 148, 136, 0.3);
}

.download-card .info {
    flex: 1;
}

.download-card .name {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 6px;
}

.download-card .desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
    line-height: 1.5;
}

.download-card .meta {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Download Tags */
.download-tag {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 600;
    padding: 2px 10px;
    border-radius: 50px;
    text-transform: uppercase;
}

.download-tag.free {
    background-color: rgba(16, 185, 129, 0.15);
    color: #10b981;
}

.download-tag.trial {
    background-color: rgba(245, 158, 11, 0.15);
    color: #f59e0b;
}

.download-tag.licensed {
    background-color: rgba(239, 68, 68, 0.15);
    color: #ef4444;
}

.download-tag.web {
    background-color: rgba(59, 130, 246, 0.15);
    color: #3b82f6;
}

.download-tag.rec {
    background-color: var(--primary-light);
    color: var(--primary);
    border: 1px solid rgba(13, 148, 136, 0.2);
}

/* Sidebar navigation for Download Center */
.download-panel {
    display: none;
    animation: fadeIn 0.4s ease forwards;
}

.download-panel.active {
    display: block;
}

.download-panel h2 {
    font-size: 1.6rem;
    color: var(--text-primary);
    margin-bottom: 24px;
    border-bottom: 2px solid var(--primary);
    display: inline-block;
    padding-bottom: 6px;
}

/* Google Drive Cloud Downloader Styling */
.gdrive-container {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 24px;
    margin-top: 20px;
}

.gdrive-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

.gdrive-title-wrapper {
    display: flex;
    align-items: center;
    gap: 12px;
}

.gdrive-icon {
    color: #34a853; /* Google Drive Green */
    font-size: 1.8rem;
    display: flex;
    align-items: center;
}

.gdrive-icon svg {
    animation: none !important;
    width: 28px;
    height: 28px;
}

.gdrive-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin: 0;
}

.gdrive-auth-btn {
    background-color: #4285f4; /* Google Blue */
    color: #ffffff;
    border-radius: var(--border-radius-sm);
    padding: 8px 16px;
    font-size: 0.85rem;
    font-weight: 600;
    border: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.gdrive-auth-btn:hover {
    background-color: #357ae8;
}

.gdrive-config-panel {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 16px;
    margin-bottom: 20px;
}

.gdrive-form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

@media (max-width: 768px) {
    .gdrive-form-grid {
        grid-template-columns: 1fr;
    }
}

.gdrive-form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.gdrive-form-group label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.gdrive-input {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 8px 12px;
    font-size: 0.85rem;
    color: var(--text-primary);
    width: 100%;
}

.gdrive-input:focus {
    outline: none;
    border-color: var(--primary);
}

.gdrive-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 12px;
}

/* File list table */
.gdrive-files-wrapper {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    overflow: hidden;
}

.gdrive-search-bar {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    padding: 12px 16px;
    gap: 12px;
    background-color: var(--bg-secondary);
}

.gdrive-search-input {
    flex: 1;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 6px 12px;
    font-size: 0.85rem;
    background-color: var(--bg-primary);
    color: var(--text-primary);
}

.gdrive-search-input:focus {
    outline: none;
    border-color: var(--primary);
}

.gdrive-filter-select {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 6px 12px;
    font-size: 0.85rem;
    background-color: var(--bg-primary);
    color: var(--text-primary);
}

.gdrive-table-container {
    overflow-x: auto;
}

.gdrive-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

.gdrive-table th, .gdrive-table td {
    padding: 12px 16px;
    font-size: 0.85rem;
    border-bottom: 1px solid var(--border-color);
}

.gdrive-table th {
    background-color: var(--bg-tertiary);
    font-weight: 600;
    color: var(--text-secondary);
}

.gdrive-table tr:hover td {
    background-color: var(--bg-primary);
}

.file-name-cell {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
}

.file-icon {
    font-size: 1.1rem;
}

/* Folder, PDF, ZIP, Image icons color */
.file-icon.folder { color: #fabb05; }
.file-icon.pdf { color: #ea4335; }
.file-icon.zip { color: #a0c3ff; }
.file-icon.image { color: #4285f4; }
.file-icon.file { color: #7f8c8d; }

.gdrive-table-btn {
    padding: 4px 10px;
    font-size: 0.75rem;
    border-radius: var(--border-radius-sm);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

/* Mode toggles and status indicators */
.gdrive-status {
    padding: 40px;
    text-align: center;
    color: var(--text-secondary);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.gdrive-spinner {
    width: 30px;
    height: 30px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: gdrive-spin 1s linear infinite;
}

@keyframes gdrive-spin {
    to { transform: rotate(360deg); }
}

.gdrive-demo-badge {
    background-color: rgba(245, 158, 11, 0.15);
    color: #f59e0b;
    border: 1px solid rgba(245, 158, 11, 0.3);
    padding: 2px 8px;
    font-size: 0.7rem;
    font-weight: 600;
    border-radius: 4px;
    display: inline-block;
}

.gdrive-setup-guide {
    margin-top: 30px;
    border: 1px dashed var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 20px;
    background-color: var(--bg-tertiary);
}

.gdrive-setup-title {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.gdrive-setup-steps {
    list-style: decimal;
    padding-left: 20px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

/* ========================================================================
   PAGE BANNER BACKGROUND CAROUSEL
   ======================================================================== */
.page-banner-slider {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    overflow: hidden;
}

.page-banner-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 0;
    transition: opacity 1.5s ease-in-out;
    transform: scale(1.06);
}

.page-banner-slide.active {
    opacity: 0.85; /* Significantly increased opacity to display map colors clearly */
    animation: bannerKenBurns 24s ease-in-out infinite alternate;
}

.page-banner-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2;
    /* Soft, less intense radial gradient to let the maps show through on the sides */
    background-image: 
        radial-gradient(circle, rgba(15, 23, 42, 0.6) 0%, rgba(15, 23, 42, 0.3) 65%, rgba(15, 23, 42, 0.05) 100%),
        linear-gradient(rgba(255, 255, 255, 0.015) 1px, transparent 1px), 
        linear-gradient(90deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
    background-size: 100% 100%, 30px 30px, 30px 30px;
    pointer-events: none;
    backdrop-filter: blur(0.5px);
}

/* Maintain proper contrast for text overlay using a unified glassmorphic panel */
.page-banner .container {
    position: relative;
    z-index: 3;
    max-width: 860px !important; /* Premium panel width */
    margin: 0 auto !important;
    padding: 30px 40px !important;
    background-color: rgba(11, 19, 41, 0.78) !important; /* Translucent deep slate background */
    border: 1px solid rgba(255, 255, 255, 0.08) !important; /* Fine edge highlight */
    border-radius: var(--border-radius-lg) !important;
    backdrop-filter: blur(8px) !important; /* Soft glass blur to diffuse maps underneath */
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4) !important;
    text-align: center;
}

.page-banner h1 {
    color: #ffffff !important;
    font-size: 2.25rem !important;
    font-weight: 800 !important;
    margin-top: 15px !important;
    margin-bottom: 0 !important;
    letter-spacing: -0.02em !important;
    text-shadow: none !important; /* Crisp, clean typography inside the dark card */
}

.page-banner p {
    color: #e2e8f0 !important; /* Light slate text for high readability */
    font-weight: 400 !important;
    font-size: 1.05rem !important;
    max-width: 720px !important;
    margin: 15px auto 0 auto !important;
    line-height: 1.6 !important;
    display: block !important;
    padding: 0 !important;
    background: none !important;
    border: none !important;
    border-radius: 0 !important;
    backdrop-filter: none !important;
    box-shadow: none !important;
    text-shadow: none !important;
}

.page-banner .badge {
    display: inline-block !important;
    padding: 4px 14px !important;
    font-size: 0.75rem !important;
    font-weight: 700 !important;
    border-radius: 50px !important;
    text-transform: uppercase !important;
    letter-spacing: 0.08em !important;
    background-color: rgba(6, 182, 212, 0.12) !important; /* Translucent cyan glow */
    color: #22d3ee !important; /* Bright high-contrast cyan */
    border: 1px solid rgba(34, 211, 238, 0.3) !important;
    box-shadow: none !important;
    text-shadow: none !important;
}

@keyframes bannerKenBurns {
    0% {
        transform: scale(1.05) translate(0, 0);
    }
    100% {
        transform: scale(1.15) translate(1.5%, -0.5%);
    }
}