/** * Copyright (c) 2026 DNA Genics, S.L. All rights reserved.
 * 
 * Learn Page - Cinematic Knowledge Hub
 * A calm, scholarly, welcoming design for understanding ancestry, genetics, and tools.
 * Follows the design system established in ProductServices.css
 */

/* ========================================
   FONT IMPORTS
   ======================================== */
@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,400;0,500;0,600;0,700;1,400&family=Inter:wght@300;400;500;600;700&display=swap');

/* ========================================
   CSS VARIABLES - LEARN DESIGN SYSTEM
   ======================================== */
:root {
    /* Primary Brand Colors */
    --learn-deep: #0f1419;
    --learn-deep-soft: #1a2332;
    --learn-navy: #162029;
    --learn-slate: #1e2d38;
    
    /* Accent Colors - Scholarly Theme */
    --learn-primary: #2c7a7b;
    --learn-primary-dark: #1a5456;
    --learn-primary-light: #81e6d9;
    --learn-teal: #319795;
    --learn-teal-light: #4fd1c5;
    --learn-gold: #b7945e;
    --learn-gold-light: #d4a863;
    
    /* Neutral Palette */
    --learn-white: #ffffff;
    --learn-off-white: #faf9f7;
    --learn-cream: #f5f3ef;
    --learn-gray-100: #f1f0ed;
    --learn-gray-200: #e4e2dc;
    --learn-gray-300: #c5c2ba;
    --learn-gray-400: #9a968c;
    --learn-gray-500: #706c64;
    --learn-gray-600: #4a473f;
    --learn-gray-700: #2d2a24;
    --learn-gray-800: #1a1815;
    --learn-gray-900: #0d0c0a;
    
    /* Text Colors */
    --learn-text-dark: #1a1815;
    --learn-text-body: #4a473f;
    --learn-text-muted: #706c64;
    --learn-text-light: #f0f0f2;
    --learn-text-light-muted: rgba(240, 240, 242, 0.7);
    
    /* Typography */
    --learn-font-serif: 'Cormorant Garamond', 'Georgia', 'Times New Roman', serif;
    --learn-font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    /* Spacing */
    --learn-space-xs: 0.5rem;
    --learn-space-sm: 1rem;
    --learn-space-md: 1.5rem;
    --learn-space-lg: 2.5rem;
    --learn-space-xl: 4rem;
    --learn-space-2xl: 6rem;
    --learn-space-3xl: 8rem;
    
    /* Border Radius */
    --learn-radius-sm: 4px;
    --learn-radius-md: 8px;
    --learn-radius-lg: 12px;
    --learn-radius-xl: 16px;
    --learn-radius-full: 9999px;
    
    /* Shadows */
    --learn-shadow-soft: 0 2px 8px rgba(0, 0, 0, 0.04);
    --learn-shadow-md: 0 4px 20px rgba(0, 0, 0, 0.06);
    --learn-shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.08);
    --learn-shadow-xl: 0 16px 64px rgba(0, 0, 0, 0.1);
    --learn-shadow-primary: 0 8px 32px rgba(44, 122, 123, 0.2);
    --learn-shadow-dark: 0 4px 24px rgba(0, 0, 0, 0.4);
    
    /* Transitions */
    --learn-ease: cubic-bezier(0.4, 0, 0.2, 1);
    --learn-ease-gentle: cubic-bezier(0.25, 0.1, 0.25, 1);
    --learn-transition-fast: 0.15s var(--learn-ease);
    --learn-transition: 0.3s var(--learn-ease);
    --learn-transition-slow: 0.6s var(--learn-ease-gentle);
    
    /* Editorial Design Variables */
    --learn-accent-line-width: 3px;
    --learn-accent-line-color: var(--learn-teal);
    --learn-editorial-title-size-sm: 1.35rem;
    --learn-editorial-title-size-md: 1.65rem;
    --learn-editorial-title-size-lg: 2rem;
    --learn-editorial-number-size: 3rem;
    --learn-editorial-number-opacity: 0.15;
    --learn-editorial-border-subtle: 1px solid var(--learn-gray-200);
    --learn-editorial-border-accent: var(--learn-accent-line-width) solid var(--learn-accent-line-color);
}

/* ========================================
   BASE STYLES
   ======================================== */
.learn-page {
    font-family: var(--learn-font-sans);
    color: var(--learn-text-body);
    background: var(--learn-off-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    line-height: 1.7;
}

.learn-page *,
.learn-page *::before,
.learn-page *::after {
    box-sizing: border-box;
}

/* Skip Link - Accessibility */
.learn-skip-link {
    position: absolute;
    top: -100px;
    left: 16px;
    background: var(--learn-primary);
    color: var(--learn-white);
    padding: 12px 24px;
    text-decoration: none;
    font-weight: 600;
    border-radius: var(--learn-radius-sm);
    z-index: 10000;
    transition: top var(--learn-transition-fast);
}

.learn-skip-link:focus {
    top: 16px;
    outline: 3px solid var(--learn-primary-light);
    outline-offset: 2px;
}

/* Container */
.learn-container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--learn-space-lg);
}

.learn-container--narrow {
    max-width: 900px;
}

/* ========================================
   TYPOGRAPHY
   ======================================== */
.learn-display-hero {
    font-family: var(--learn-font-serif);
    font-size: clamp(2.5rem, 5vw + 1rem, 4rem);
    font-weight: 400;
    line-height: 1.1;
    letter-spacing: -0.02em;
    color: var(--learn-text-light);
    margin: 0;
}

.learn-display-1 {
    font-family: var(--learn-font-serif);
    font-size: clamp(1.75rem, 3vw + 0.5rem, 2.75rem);
    font-weight: 500;
    line-height: 1.2;
    letter-spacing: -0.01em;
    color: var(--learn-text-dark);
    margin: 0;
}

.learn-text-gradient {
    background: linear-gradient(135deg, var(--learn-teal-light), var(--learn-gold-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.learn-text-light {
    color: var(--learn-text-light) !important;
}

.learn-text-light-muted {
    color: var(--learn-text-light-muted) !important;
}

/* ========================================
   SCROLL PROGRESS & NAVIGATION
   ======================================== */
.learn-scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 3px;
    background: linear-gradient(90deg, var(--learn-primary), var(--learn-teal-light));
    z-index: 9999;
    transition: width 0.1s linear;
}

.learn-page-nav {
    position: fixed;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.learn-nav-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    border: 2px solid var(--learn-primary);
    transition: all var(--learn-transition);
    position: relative;
    cursor: pointer;
}

.learn-nav-dot:hover,
.learn-nav-dot.active {
    background: var(--learn-primary);
    transform: scale(1.3);
}

.learn-nav-dot::after {
    content: attr(data-tooltip);
    position: absolute;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
    background: var(--learn-deep);
    color: var(--learn-text-light);
    padding: 6px 12px;
    border-radius: var(--learn-radius-sm);
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--learn-transition);
    font-size: 0.8rem;
    font-weight: 500;
}

.learn-nav-dot:hover::after {
    opacity: 1;
}

.learn-back-to-top {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--learn-deep);
    color: var(--learn-text-light);
    border: none;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--learn-transition);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--learn-shadow-lg);
}

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

.learn-back-to-top:hover {
    background: var(--learn-primary);
    transform: translateY(-4px);
}

/* ========================================
   ANIMATIONS
   ======================================== */
.learn-animate {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s var(--learn-ease-gentle), transform 0.8s var(--learn-ease-gentle);
}

.learn-animate--visible {
    opacity: 1;
    transform: translateY(0);
}

.learn-animate-delay-1 { transition-delay: 0.1s; }
.learn-animate-delay-2 { transition-delay: 0.2s; }
.learn-animate-delay-3 { transition-delay: 0.3s; }
.learn-animate-delay-4 { transition-delay: 0.4s; }
.learn-animate-delay-5 { transition-delay: 0.5s; }

/* ========================================
   BUTTONS
   ======================================== */
.learn-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    font-family: var(--learn-font-sans);
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--learn-radius-md);
    cursor: pointer;
    transition: all var(--learn-transition);
    border: 2px solid transparent;
}

.learn-btn--primary {
    background: linear-gradient(135deg, var(--learn-primary), var(--learn-teal));
    color: var(--learn-white);
    border-color: transparent;
}

.learn-btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--learn-shadow-primary);
    color: var(--learn-white);
    text-decoration: none;
}

.learn-btn--outline {
    background: transparent;
    color: var(--learn-primary);
    border-color: var(--learn-primary);
}

.learn-btn--outline:hover {
    background: var(--learn-primary);
    color: var(--learn-white);
    text-decoration: none;
}

.learn-btn--outline-light {
    background: transparent;
    color: var(--learn-text-light);
    border-color: rgba(255, 255, 255, 0.4);
}

.learn-btn--outline-light:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--learn-text-light);
    color: var(--learn-text-light);
    text-decoration: none;
}

.learn-btn--lg {
    padding: 16px 32px;
    font-size: 1rem;
}

.learn-btn--small {
    padding: 8px 16px;
    font-size: 0.85rem;
}

/* ========================================
   SECTIONS
   ======================================== */
.learn-section {
    padding: var(--learn-space-3xl) 0;
    position: relative;
}

.learn-section--cream {
    background: var(--learn-cream);
}

.learn-section--dark {
    background: linear-gradient(180deg, var(--learn-deep) 0%, var(--learn-deep-soft) 100%);
}

.learn-section--responsibility {
    background: linear-gradient(135deg, var(--learn-navy) 0%, var(--learn-slate) 100%);
}

.learn-section--cta {
    background: linear-gradient(135deg, var(--learn-deep) 0%, var(--learn-primary-dark) 100%);
    position: relative;
    overflow: hidden;
}

.learn-section-header {
    text-align: center;
    margin-bottom: var(--learn-space-xl);
}

.learn-section-header--light {
    color: var(--learn-text-light);
}

.learn-section-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--learn-primary);
    margin-bottom: var(--learn-space-sm);
    padding: 6px 16px;
    background: rgba(44, 122, 123, 0.1);
    border-radius: var(--learn-radius-full);
}

.learn-section-label--light {
    color: var(--learn-teal-light);
    background: rgba(79, 209, 197, 0.15);
}

.learn-section-label--gold {
    color: var(--learn-gold-light);
    background: rgba(212, 168, 99, 0.15);
}

.learn-section-subtitle {
    font-size: 1.1rem;
    color: var(--learn-text-muted);
    max-width: 700px;
    margin: var(--learn-space-sm) auto 0;
    line-height: 1.7;
}

.learn-subsection-title {
    font-family: var(--learn-font-sans);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--learn-text-dark);
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: var(--learn-space-md);
}

.learn-subsection-title i {
    color: var(--learn-primary);
}

.learn-subsection-intro {
    color: var(--learn-text-muted);
    margin-bottom: var(--learn-space-lg);
}

/* ========================================
   HERO SECTION
   ======================================== */
.learn-hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.learn-hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('/img/ui/backgrounds/learn/header-learning.jpg') center/cover no-repeat;
    z-index: 0;
}

.learn-hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, 
        rgba(15, 20, 25, 0.85) 0%, 
        rgba(15, 20, 25, 0.75) 50%,
        rgba(15, 20, 25, 0.9) 100%);
}

.learn-hero-texture {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
    opacity: 0.03;
    pointer-events: none;
}

.learn-hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    padding: var(--learn-space-xl) var(--learn-space-lg);
}

.learn-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: rgba(79, 209, 197, 0.15);
    border: 1px solid rgba(79, 209, 197, 0.3);
    border-radius: var(--learn-radius-full);
    color: var(--learn-teal-light);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: var(--learn-space-md);
}

.learn-hero-subtitle {
    font-size: 1.25rem;
    color: var(--learn-text-light-muted);
    line-height: 1.8;
    margin: var(--learn-space-md) 0 var(--learn-space-lg);
}

.learn-hero-trust {
    display: flex;
    justify-content: center;
    gap: var(--learn-space-lg);
    flex-wrap: wrap;
    margin-bottom: var(--learn-space-xl);
}

.learn-trust-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--learn-text-light-muted);
    font-size: 0.9rem;
}

.learn-trust-item i {
    color: var(--learn-teal-light);
}

.learn-hero-cta {
    display: flex;
    justify-content: center;
    gap: var(--learn-space-sm);
    flex-wrap: wrap;
}

/* Scroll Indicator */
.learn-scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: var(--learn-text-light-muted);
    font-size: 0.8rem;
    animation: bounce 2s infinite;
}

.learn-scroll-mouse {
    width: 24px;
    height: 40px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 12px;
    position: relative;
}

.learn-scroll-wheel {
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--learn-teal-light);
    border-radius: 2px;
    animation: scroll 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

@keyframes scroll {
    0% { opacity: 1; transform: translateX(-50%) translateY(0); }
    100% { opacity: 0; transform: translateX(-50%) translateY(16px); }
}

/* ========================================
   NARRATIVE & QUOTES
   ======================================== */
.learn-narrative {
    text-align: center;
    margin-bottom: var(--learn-space-xl);
}

.learn-narrative-lead {
    font-family: var(--learn-font-serif);
    font-size: 1.5rem;
    font-weight: 400;
    font-style: italic;
    line-height: 2;
    color: var(--learn-text-dark);
}

.learn-quote {
    text-align: center;
    margin-top: var(--learn-space-xl);
}

.learn-quote blockquote {
    margin: 0;
    padding: var(--learn-space-lg);
    background: linear-gradient(135deg, rgba(44, 122, 123, 0.05), rgba(183, 148, 94, 0.05));
    border-left: 4px solid var(--learn-primary);
    border-radius: var(--learn-radius-md);
}

.learn-quote blockquote p {
    font-family: var(--learn-font-serif);
    font-size: 1.35rem;
    font-weight: 500;
    font-style: italic;
    color: var(--learn-text-dark);
    margin: 0;
}

/* ========================================
   INSIGHT CARDS - Editorial Style
   ======================================== */
.learn-insight-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--learn-space-xl);
    margin-bottom: var(--learn-space-lg);
}

.learn-insight-card {
    background: transparent;
    padding: var(--learn-space-lg) 0;
    border-top: var(--learn-editorial-border-accent);
    position: relative;
}

.learn-insight-number {
    position: absolute;
    top: var(--learn-space-lg);
    right: 0;
    font-family: var(--learn-font-serif);
    font-size: var(--learn-editorial-number-size);
    font-weight: 400;
    color: var(--learn-text-dark);
    opacity: var(--learn-editorial-number-opacity);
    line-height: 1;
    pointer-events: none;
}

.learn-insight-card h3 {
    font-family: var(--learn-font-serif);
    font-size: var(--learn-editorial-title-size-sm);
    font-weight: 500;
    color: var(--learn-text-dark);
    margin: 0 0 var(--learn-space-sm);
    padding-right: 4rem;
}

.learn-insight-card p {
    font-size: 0.95rem;
    color: var(--learn-text-muted);
    margin: 0;
    line-height: 1.8;
}

/* ========================================
   LEARNING PATHS - Editorial Style
   ======================================== */
.learn-paths-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--learn-space-lg);
}

.learn-path-card {
    background: rgba(255, 255, 255, 0.05);
    border-left: var(--learn-editorial-border-accent);
    border-top: none;
    border-right: none;
    border-bottom: none;
    padding: var(--learn-space-xl);
    padding-left: calc(var(--learn-space-xl) + var(--learn-accent-line-width));
    display: flex;
    flex-direction: column;
    transition: border-color var(--learn-transition);
}

.learn-path-card:hover {
    border-left-color: var(--learn-teal-light);
}

.learn-path-content {
    flex: 1;
}

.learn-path-subtitle {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--learn-teal-light);
    margin: 0 0 var(--learn-space-xs);
    display: block;
}

.learn-path-title {
    font-family: var(--learn-font-serif);
    font-size: var(--learn-editorial-title-size-md);
    font-weight: 500;
    color: var(--learn-text-light);
    margin: 0 0 var(--learn-space-sm);
}

.learn-path-description {
    font-size: 0.95rem;
    color: var(--learn-text-light-muted);
    margin: 0 0 var(--learn-space-lg);
    line-height: 1.8;
}

.learn-path-cta {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--learn-teal-light);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--learn-transition);
}

.learn-path-cta:hover {
    color: var(--learn-white);
    gap: 12px;
    text-decoration: none;
}

.learn-modules-link {
    margin-top: var(--learn-space-xl);
    padding-top: var(--learn-space-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.learn-modules-links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--learn-space-lg);
    text-align: center;
}

.learn-modules-link-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--learn-space-md);
}

.learn-modules-link-item p {
    margin: 0;
    color: var(--learn-text-light-muted);
}

.learn-modules-link-item p i {
    margin-right: 8px;
}

/* ========================================
   CONCEPT CARDS - Editorial Style
   ======================================== */
.learn-concepts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--learn-space-lg);
    margin-bottom: var(--learn-space-2xl);
}

.learn-concept-card {
    background: var(--learn-white);
    border-left: var(--learn-editorial-border-accent);
    border-top: var(--learn-editorial-border-subtle);
    border-right: var(--learn-editorial-border-subtle);
    border-bottom: var(--learn-editorial-border-subtle);
    padding: var(--learn-space-lg);
    padding-left: calc(var(--learn-space-lg) + var(--learn-accent-line-width));
    transition: border-color var(--learn-transition);
}

.learn-concept-card:hover {
    border-left-color: var(--learn-teal-light);
}

.learn-concept-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--learn-space-sm);
    margin-bottom: var(--learn-space-sm);
}

.learn-concept-title {
    font-family: var(--learn-font-serif);
    font-size: var(--learn-editorial-title-size-sm);
    font-weight: 500;
    color: var(--learn-text-dark);
    margin: 0;
    flex: 1;
    line-height: 1.4;
}

.learn-concept-toggle {
    width: 32px;
    height: 32px;
    border-radius: var(--learn-radius-md);
    border: 1px solid var(--learn-gray-200);
    background: var(--learn-gray-100);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--learn-transition);
    flex-shrink: 0;
}

.learn-concept-toggle:hover {
    background: var(--learn-primary);
    border-color: var(--learn-primary);
    color: var(--learn-white);
}

.learn-concept-toggle i {
    transition: transform var(--learn-transition);
}

.learn-concept-toggle[aria-expanded="true"] i {
    transform: rotate(180deg);
}

.learn-concept-summary {
    font-size: 0.95rem;
    color: var(--learn-text-muted);
    margin: 0;
    line-height: 1.7;
}

.learn-concept-content {
    margin-top: var(--learn-space-md);
    padding-top: var(--learn-space-md);
    border-top: 1px solid var(--learn-gray-200);
}

.learn-concept-content p {
    font-size: 0.95rem;
    color: var(--learn-text-body);
    margin: 0;
    line-height: 1.8;
}

.learn-concept-video {
    margin-top: var(--learn-space-sm);
}

.learn-video-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--learn-primary);
    font-weight: 500;
    text-decoration: none;
    font-size: 0.9rem;
}

.learn-video-link:hover {
    color: var(--learn-primary-dark);
    text-decoration: underline;
}

/* ========================================
   VIDEO SECTION
   ======================================== */
.learn-videos-section {
    background: var(--learn-cream);
    border-radius: var(--learn-radius-xl);
    padding: var(--learn-space-xl);
}

.learn-video-tabs {
    display: flex;
    gap: var(--learn-space-sm);
    margin-bottom: var(--learn-space-lg);
    flex-wrap: wrap;
}

.learn-video-tab {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--learn-white);
    border: 1px solid var(--learn-gray-200);
    border-radius: var(--learn-radius-full);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--learn-text-muted);
    cursor: pointer;
    transition: all var(--learn-transition);
}

.learn-video-tab:hover {
    border-color: var(--learn-primary);
    color: var(--learn-primary);
}

.learn-video-tab.active {
    background: var(--learn-primary);
    border-color: var(--learn-primary);
    color: var(--learn-white);
}

.learn-videos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--learn-space-lg);
}

.learn-video-card {
    background: var(--learn-white);
    border: var(--learn-editorial-border-subtle);
    overflow: hidden;
    transition: border-color var(--learn-transition);
}

.learn-video-card:hover {
    border-color: var(--learn-primary);
}

.learn-video-card[data-category]:not(.show) {
    display: none;
}

.learn-video-card.show,
.learn-video-card[data-category="foundations"] {
    display: block;
}

.learn-video-wrapper {
    position: relative;
    padding-top: 56.25%;
    background: var(--learn-gray-100);
}

.learn-video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

.learn-video-info {
    padding: var(--learn-space-md);
}

.learn-video-title {
    font-family: var(--learn-font-serif);
    font-size: 1rem;
    font-weight: 500;
    color: var(--learn-text-dark);
    margin: 0 0 4px;
}

.learn-video-description {
    font-size: 0.85rem;
    color: var(--learn-text-muted);
    margin: 0;
}

/* Analysis Methods Callout - Editorial Style */
.learn-methods-callout {
    background: var(--learn-cream);
    border-left: var(--learn-editorial-border-accent);
    border-top: var(--learn-editorial-border-subtle);
    border-right: var(--learn-editorial-border-subtle);
    border-bottom: var(--learn-editorial-border-subtle);
    padding: var(--learn-space-xl);
    padding-left: calc(var(--learn-space-xl) + var(--learn-accent-line-width));
    margin-top: var(--learn-space-2xl);
}

.learn-methods-callout-content {
    width: 100%;
}

.learn-methods-callout-title {
    font-family: var(--learn-font-serif);
    font-weight: 500;
    font-size: var(--learn-editorial-title-size-sm);
    color: var(--learn-text-dark);
    margin: 0 0 var(--learn-space-sm) 0;
}

.learn-methods-callout-desc {
    font-size: 0.95rem;
    color: var(--learn-text-muted);
    line-height: 1.8;
    margin: 0 0 var(--learn-space-md) 0;
}

.learn-methods-callout-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--learn-gold);
    text-decoration: none;
    transition: all var(--learn-transition);
}

.learn-methods-callout-link:hover {
    color: var(--learn-gold-dark);
    gap: 0.75rem;
}

.learn-methods-callout-link i {
    transition: transform var(--learn-transition);
}

.learn-methods-callout-link:hover i {
    transform: translateX(4px);
}

@media (max-width: 576px) {
    .learn-methods-callout-link {
        justify-content: center;
    }
}

/* ========================================
   TIMELINE (Deep Time)
   ======================================== */
.learn-timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto var(--learn-space-xl);
}

.learn-timeline-item {
    display: flex;
    gap: var(--learn-space-lg);
    margin-bottom: var(--learn-space-xl);
    position: relative;
}

.learn-timeline-item:last-child {
    margin-bottom: 0;
}

.learn-timeline-marker {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex-shrink: 0;
}

.learn-timeline-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--learn-teal);
    border: 2px solid var(--learn-white);
    box-shadow: 0 0 0 2px var(--learn-teal);
    z-index: 1;
    flex-shrink: 0;
}

.learn-timeline-line {
    width: 2px;
    flex: 1;
    background: var(--learn-gray-300);
    margin-top: var(--learn-space-sm);
}

.learn-timeline-item:last-child .learn-timeline-line {
    display: none;
}

.learn-timeline-content {
    flex: 1;
    padding-top: 8px;
}

.learn-timeline-era {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--learn-primary);
    margin-bottom: 4px;
}

.learn-timeline-title {
    font-family: var(--learn-font-serif);
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--learn-text-dark);
    margin: 0 0 var(--learn-space-sm);
}

.learn-timeline-description {
    font-size: 0.95rem;
    color: var(--learn-text-muted);
    margin: 0;
    line-height: 1.7;
}

/* Deep Ancestry CTA */
.learn-deep-cta {
    background: var(--learn-white);
    border-radius: var(--learn-radius-xl);
    padding: var(--learn-space-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--learn-space-lg);
    box-shadow: var(--learn-shadow-md);
    flex-wrap: wrap;
}

.learn-deep-cta-content h3 {
    font-family: var(--learn-font-serif);
    font-size: 1.35rem;
    font-weight: 500;
    color: var(--learn-text-dark);
    margin: 0 0 8px;
}

.learn-deep-cta-content p {
    font-size: 0.95rem;
    color: var(--learn-text-muted);
    margin: 0;
}

.learn-deep-cta-actions {
    display: flex;
    gap: var(--learn-space-sm);
    flex-wrap: wrap;
}

/* ========================================
   TOOLS GRID
   ======================================== */
.learn-tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--learn-space-lg);
    margin-bottom: var(--learn-space-2xl);
}

.learn-tool-card {
    background: var(--learn-cream);
    border-left: var(--learn-editorial-border-accent);
    border-top: var(--learn-editorial-border-subtle);
    border-right: var(--learn-editorial-border-subtle);
    border-bottom: var(--learn-editorial-border-subtle);
    padding: var(--learn-space-lg);
    padding-left: calc(var(--learn-space-lg) + var(--learn-accent-line-width));
    transition: border-color var(--learn-transition);
}

.learn-tool-card:hover {
    border-left-color: var(--learn-teal-light);
}

.learn-tool-title {
    font-family: var(--learn-font-serif);
    font-size: var(--learn-editorial-title-size-sm);
    font-weight: 500;
    color: var(--learn-text-dark);
    margin: 0 0 var(--learn-space-md);
}

.learn-tool-description {
    font-size: 0.95rem;
    color: var(--learn-text-muted);
    margin: 0 0 var(--learn-space-md);
    line-height: 1.7;
}

.learn-tool-points {
    list-style: none;
    padding: 0;
    margin: 0 0 var(--learn-space-md);
}

.learn-tool-points li {
    font-size: 0.9rem;
    color: var(--learn-text-body);
    margin-bottom: 8px;
    padding-left: 1rem;
    position: relative;
}

.learn-tool-points li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--learn-text-muted);
}

.learn-tool-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--learn-primary);
    font-weight: 600;
    text-decoration: none;
    font-size: 0.9rem;
    transition: all var(--learn-transition);
}

.learn-tool-link:hover {
    color: var(--learn-primary-dark);
    gap: 12px;
    text-decoration: none;
}

/* Quick Access Tools */
.learn-tools-quick {
    background: var(--learn-cream);
    border-radius: var(--learn-radius-xl);
    padding: var(--learn-space-xl);
}

.learn-tools-quick-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--learn-space-sm);
}

.learn-quick-tool {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: var(--learn-space-md);
    background: var(--learn-white);
    border: 1px solid var(--learn-gray-200);
    border-radius: var(--learn-radius-md);
    text-decoration: none;
    transition: all var(--learn-transition);
}

.learn-quick-tool:hover {
    border-color: var(--learn-primary);
    background: linear-gradient(135deg, rgba(44, 122, 123, 0.05), rgba(79, 209, 197, 0.05));
    text-decoration: none;
}

.learn-quick-tool i {
    color: var(--learn-primary);
    font-size: 1.25rem;
}

.learn-quick-tool span {
    font-weight: 500;
    color: var(--learn-text-dark);
}

/* ========================================
   RESPONSIBILITY SECTION
   ======================================== */
.learn-responsibility-content {
    text-align: center;
}

.learn-responsibility-quote {
    margin-bottom: var(--learn-space-xl);
}

.learn-responsibility-quote blockquote {
    background: transparent;
    border: none;
    padding: 0;
}

.learn-responsibility-quote blockquote p {
    font-family: var(--learn-font-serif);
    font-size: clamp(1.5rem, 3vw, 2.25rem);
    font-weight: 400;
    font-style: italic;
    color: var(--learn-gold-light);
    margin: 0;
}

.learn-responsibility-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--learn-space-lg);
    text-align: left;
}

.learn-responsibility-card {
    background: rgba(255, 255, 255, 0.05);
    border-left: 3px solid var(--learn-gold);
    border-top: none;
    border-right: none;
    border-bottom: none;
    padding: var(--learn-space-lg);
    padding-left: calc(var(--learn-space-lg) + 3px);
}

.learn-responsibility-card h3 {
    font-family: var(--learn-font-serif);
    font-size: var(--learn-editorial-title-size-sm);
    font-weight: 500;
    color: var(--learn-text-light);
    margin: 0 0 var(--learn-space-sm);
}

.learn-responsibility-card p {
    font-size: 0.9rem;
    color: var(--learn-text-light-muted);
    margin: 0;
    line-height: 1.7;
}

.learn-responsibility-anchor {
    margin-top: var(--learn-space-xl);
    text-align: center;
}

/* ========================================
   GUIDED JOURNEYS
   ======================================== */
.learn-journeys-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: var(--learn-space-lg);
}

.learn-journey-card {
    background: var(--learn-white);
    border-left: var(--learn-editorial-border-accent);
    border-top: var(--learn-editorial-border-subtle);
    border-right: var(--learn-editorial-border-subtle);
    border-bottom: var(--learn-editorial-border-subtle);
    padding: var(--learn-space-lg);
    padding-left: calc(var(--learn-space-lg) + var(--learn-accent-line-width));
    transition: border-color var(--learn-transition);
}

.learn-journey-card:hover {
    border-left-color: var(--learn-teal-light);
}

.learn-journey-header {
    margin-bottom: var(--learn-space-lg);
    padding-bottom: var(--learn-space-md);
    border-bottom: var(--learn-editorial-border-subtle);
}

.learn-journey-info {
    width: 100%;
}

.learn-journey-title {
    font-family: var(--learn-font-serif);
    font-size: var(--learn-editorial-title-size-sm);
    font-weight: 500;
    color: var(--learn-text-dark);
    margin: 0 0 4px;
}

.learn-journey-description {
    font-size: 0.9rem;
    color: var(--learn-text-muted);
    margin: 0;
    line-height: 1.7;
}

.learn-journey-steps {
    list-style: none;
    padding: 0;
    margin: 0 0 var(--learn-space-lg);
    counter-reset: step;
}

.learn-journey-step {
    display: flex;
    align-items: center;
    gap: var(--learn-space-sm);
    padding: var(--learn-space-sm) 0;
    border-bottom: 1px dashed var(--learn-gray-200);
}

.learn-journey-step:last-child {
    border-bottom: none;
}

.learn-step-number {
    font-family: var(--learn-font-serif);
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--learn-primary);
    flex-shrink: 0;
    min-width: 2rem;
}

.learn-step-content {
    flex: 1;
}

.learn-step-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--learn-text-dark);
    margin: 0;
}

.learn-step-description {
    font-size: 0.8rem;
    color: var(--learn-text-muted);
    margin: 0;
}

.learn-step-link {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--learn-gray-100);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--learn-text-muted);
    text-decoration: none;
    transition: all var(--learn-transition);
    flex-shrink: 0;
}

.learn-step-link:hover {
    background: var(--learn-primary);
    color: var(--learn-white);
}

.learn-journey-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--learn-space-md);
    border-top: 1px solid var(--learn-gray-200);
}

.learn-journey-steps-count {
    font-size: 0.85rem;
    color: var(--learn-text-muted);
    display: flex;
    align-items: center;
    gap: 6px;
}

.learn-journey-steps-count i {
    color: var(--learn-primary);
}

/* More Modules CTA */
.learn-more-modules {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--learn-space-lg);
    background: var(--learn-white);
    border-radius: var(--learn-radius-xl);
    padding: var(--learn-space-lg);
    margin-top: var(--learn-space-xl);
    box-shadow: var(--learn-shadow-md);
    flex-wrap: wrap;
}

.learn-more-modules-content {
    display: flex;
    align-items: center;
    gap: var(--learn-space-md);
}

.learn-more-modules-content > i {
    font-size: 2rem;
    color: var(--learn-primary);
}

.learn-more-modules-content h3 {
    font-family: var(--learn-font-sans);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--learn-text-dark);
    margin: 0;
}

.learn-more-modules-content p {
    font-size: 0.9rem;
    color: var(--learn-text-muted);
    margin: 0;
}

/* ========================================
   FINAL CTA SECTION
   ======================================== */
.learn-cta-content {
    text-align: center;
    position: relative;
    z-index: 1;
}

.learn-cta-subtitle {
    font-size: 1.15rem;
    color: var(--learn-text-light-muted);
    margin: var(--learn-space-lg) 0 var(--learn-space-xl);
    line-height: 1.8;
}

.learn-cta-buttons {
    display: flex;
    justify-content: center;
    gap: var(--learn-space-sm);
    flex-wrap: wrap;
    margin-bottom: var(--learn-space-xl);
}

.learn-cta-links {
    display: flex;
    justify-content: center;
    gap: var(--learn-space-lg);
    flex-wrap: wrap;
}

.learn-cta-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--learn-text-light-muted);
    font-size: 0.9rem;
    text-decoration: none;
    transition: all var(--learn-transition);
}

.learn-cta-link:hover {
    color: var(--learn-text-light);
    text-decoration: none;
}

.learn-cta-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
}

.learn-cta-gradient {
    position: absolute;
    top: -50%;
    right: -20%;
    width: 70%;
    height: 200%;
    background: radial-gradient(ellipse, rgba(79, 209, 197, 0.1) 0%, transparent 70%);
}

.learn-cta-pattern {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 200px;
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.02'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */
@media (max-width: 1024px) {
    .learn-page-nav {
        display: none;
    }
    
    .learn-section {
        padding: var(--learn-space-2xl) 0;
    }
    
    .learn-hero {
        min-height: 90vh;
    }
    
    .learn-paths-grid {
        grid-template-columns: 1fr;
    }
    
    .learn-deep-cta {
        flex-direction: column;
        text-align: center;
    }
    
    .learn-more-modules {
        flex-direction: column;
        text-align: center;
    }
    
    .learn-more-modules-content {
        flex-direction: column;
    }
}

@media (max-width: 768px) {
    .learn-container {
        padding: 0 var(--learn-space-md);
    }
    
    .learn-section {
        padding: var(--learn-space-xl) 0;
    }
    
    .learn-hero {
        min-height: 80vh;
    }
    
    .learn-hero-content {
        padding: var(--learn-space-lg) var(--learn-space-sm);
    }
    
    .learn-hero-cta {
        flex-direction: column;
    }
    
    .learn-hero-trust {
        flex-direction: column;
        gap: var(--learn-space-sm);
    }
    
    .learn-scroll-indicator {
        display: none;
    }
    
    .learn-insight-cards {
        grid-template-columns: 1fr;
        gap: var(--learn-space-lg);
    }
    
    .learn-insight-number {
        font-size: 2rem;
    }
    
    .learn-insight-card h3 {
        padding-right: 3rem;
    }
    
    .learn-concepts-grid {
        grid-template-columns: 1fr;
    }
    
    .learn-video-tabs {
        flex-direction: column;
    }
    
    .learn-videos-grid {
        grid-template-columns: 1fr;
    }
    
    .learn-timeline-item {
        flex-direction: column;
        gap: var(--learn-space-md);
    }
    
    .learn-timeline-marker {
        flex-direction: row;
    }
    
    .learn-timeline-line {
        height: 2px;
        width: 100%;
        margin-left: var(--learn-space-sm);
        margin-top: 0;
    }
    
    .learn-tools-grid {
        grid-template-columns: 1fr;
    }
    
    .learn-tools-quick-grid {
        grid-template-columns: 1fr;
    }
    
    .learn-responsibility-cards {
        grid-template-columns: 1fr;
    }
    
    .learn-journeys-grid {
        grid-template-columns: 1fr;
    }
    
    .learn-cta-buttons {
        flex-direction: column;
    }
    
    .learn-cta-links {
        flex-direction: column;
        gap: var(--learn-space-sm);
    }
    
    .learn-back-to-top {
        bottom: 16px;
        right: 16px;
        width: 44px;
        height: 44px;
    }
}

@media (max-width: 480px) {
    .learn-display-hero {
        font-size: 2rem;
    }
    
    .learn-display-1 {
        font-size: 1.5rem;
    }
    
    .learn-path-card {
        padding: var(--learn-space-md);
        padding-left: calc(var(--learn-space-md) + var(--learn-accent-line-width));
    }
    
    .learn-concept-card {
        padding: var(--learn-space-md);
        padding-left: calc(var(--learn-space-md) + var(--learn-accent-line-width));
    }
    
    .learn-tool-card {
        padding: var(--learn-space-md);
        padding-left: calc(var(--learn-space-md) + var(--learn-accent-line-width));
    }
    
    .learn-journey-card {
        padding: var(--learn-space-md);
        padding-left: calc(var(--learn-space-md) + var(--learn-accent-line-width));
    }
    
    .learn-responsibility-card {
        padding: var(--learn-space-md);
        padding-left: calc(var(--learn-space-md) + 3px);
    }
    
    .learn-concept-header {
        flex-wrap: wrap;
    }
    
    .learn-journey-header {
        text-align: center;
    }
}

/* ========================================
   PRINT STYLES
   ======================================== */
@media print {
    .learn-page-nav,
    .learn-scroll-progress,
    .learn-back-to-top,
    .learn-scroll-indicator,
    .learn-hero-cta,
    .learn-cta-buttons,
    .learn-video-wrapper,
    .learn-quick-tool {
        display: none !important;
    }
    
    .learn-section {
        padding: 2rem 0;
        page-break-inside: avoid;
    }
    
    .learn-hero {
        min-height: auto;
        padding: 4rem 0;
    }
    
    .learn-section--dark,
    .learn-section--responsibility,
    .learn-section--cta {
        background: #f5f5f5;
        color: #333;
    }
    
    .learn-text-light,
    .learn-text-light-muted {
        color: #333 !important;
    }
}

/* ========================================
   REDUCED MOTION
   ======================================== */
@media (prefers-reduced-motion: reduce) {
    .learn-animate {
        opacity: 1;
        transform: none;
        transition: none;
    }
    
    .learn-scroll-indicator,
    .learn-scroll-wheel {
        animation: none;
    }
    
    .learn-btn,
    .learn-path-card,
    .learn-concept-card,
    .learn-tool-card,
    .learn-journey-card,
    .learn-video-card,
    .learn-insight-card {
        transition: none;
    }
}