/*
Theme Name: AI Culture Lab
Description: Sophisticated, accessible design for AI culture research
Version: 2.0 - Complete Overhaul
*/

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

:root {
    /* Primary Color Palette */
    --navy-900: #0f172a;
    --navy-800: #1e293b;
    --navy-700: #334155;
    --navy-600: #475569;
    --navy-500: #64748b;
    
    /* Neutral Grays */
    --white: #ffffff;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    
    /* Accent Colors */
    --blue-500: #3b82f6;
    --blue-600: #2563eb;
    --blue-700: #1d4ed8;
    --emerald-500: #10b981;
    --emerald-600: #059669;
    --orange-500: #f59e0b;
    --orange-600: #d97706;
    --purple-500: #7c3aed;
    --purple-600: #6d28d9;
    
    /* Semantic Color Assignments */
    --primary-color: var(--navy-900);
    --secondary-color: var(--navy-700);
    --accent-color: var(--blue-500);
    --success-color: var(--emerald-500);
    --warning-color: var(--orange-500);
    --premium-color: var(--purple-500);
    
    /* Text Colors */
    --text-primary: var(--navy-900);
    --text-secondary: var(--gray-600);
    --text-muted: var(--gray-500);
    --text-light: var(--gray-400);
    --text-inverse: var(--white);
    
    /* Background Colors */
    --background: var(--white);
    --surface: var(--gray-50);
    --surface-raised: var(--white);
    --border: var(--gray-200);
    --border-light: var(--gray-100);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--navy-900) 0%, var(--navy-700) 100%);
    --gradient-accent: linear-gradient(135deg, var(--blue-500) 0%, var(--blue-600) 100%);
    --gradient-hero: linear-gradient(135deg, var(--navy-900) 0%, var(--navy-800) 50%, var(--navy-700) 100%);
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Spacing & Layout */
    --border-radius: 12px;
    --border-radius-lg: 16px;
    --border-radius-xl: 24px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Typography Scale */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    /* Line Heights */
    --leading-tight: 1.25;
    --leading-snug: 1.375;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;
    --leading-loose: 2;
}

/* Typography */
body {
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: var(--font-size-base);
    line-height: var(--leading-relaxed);
    color: var(--text-primary);
    background-color: var(--background);
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Improved Typography Hierarchy */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: var(--leading-tight);
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    letter-spacing: -0.025em;
}

h1 { 
    font-size: var(--font-size-5xl); 
    font-weight: 800;
    letter-spacing: -0.05em;
}
h2 { 
    font-size: var(--font-size-4xl); 
    font-weight: 700;
}
h3 { 
    font-size: var(--font-size-3xl); 
    font-weight: 600;
}
h4 { 
    font-size: var(--font-size-2xl); 
    font-weight: 600;
}
h5 { 
    font-size: var(--font-size-xl); 
    font-weight: 600;
}
h6 { 
    font-size: var(--font-size-lg); 
    font-weight: 600;
}

p {
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
    line-height: var(--leading-relaxed);
}

/* Enhanced Links */
a {
    color: var(--accent-color);
    text-decoration: none;
    transition: var(--transition);
    position: relative;
}

a:hover {
    color: var(--blue-600);
}

a:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
    border-radius: 4px;
}

/* Code Typography */
code {
    font-family: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
    background-color: var(--gray-100);
    color: var(--text-primary);
    padding: 0.25rem 0.5rem;
    border-radius: 6px;
    font-size: 0.875em;
    font-weight: 500;
}

/* Layout System */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 2rem;
}

.container-sm {
    max-width: 640px;
    margin: 0 auto;
    padding: 0 2rem;
}

.container-lg {
    max-width: 1536px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Grid System */
.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 -1rem;
}

.col {
    padding: 0 1rem;
}

.col-1 { flex: 0 0 8.333333%; }
.col-2 { flex: 0 0 16.666667%; }
.col-3 { flex: 0 0 25%; }
.col-4 { flex: 0 0 33.333333%; }
.col-6 { flex: 0 0 50%; }
.col-8 { flex: 0 0 66.666667%; }
.col-12 { flex: 0 0 100%; }

/* Header */
.site-header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: var(--transition);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 0;
}

.site-logo {
    font-size: var(--font-size-xl);
    font-weight: 800;
    color: var(--primary-color);
    letter-spacing: -0.025em;
}

.site-logo:hover {
    color: var(--accent-color);
}

/* Enhanced Navigation */
.main-nav ul {
    list-style: none;
    display: flex;
    gap: 2.5rem;
    align-items: center;
}

.main-nav a {
    font-weight: 500;
    color: var(--text-secondary);
    padding: 0.75rem 0;
    position: relative;
    transition: var(--transition);
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.main-nav a:hover,
.main-nav a.current {
    color: var(--text-primary);
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-accent);
    transition: var(--transition);
    border-radius: 1px;
}

.main-nav a:hover::after,
.main-nav a.current::after {
    width: 100%;
}

/* Hero Section */
.hero-section {
    background: var(--gradient-hero);
    color: var(--text-inverse);
    padding: 6rem 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 50%, rgba(59, 130, 246, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 70% 80%, rgba(16, 185, 129, 0.08) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: 1.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--white) 0%, rgba(59, 130, 246, 0.9) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: var(--leading-tight);
    letter-spacing: -0.05em;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    margin-bottom: 3rem;
    opacity: 0.9;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    line-height: var(--leading-relaxed);
}

/* Enhanced CTA Button */
.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--gradient-accent);
    color: var(--text-inverse);
    padding: 1rem 2rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: var(--transition);
    box-shadow: var(--shadow-lg);
    border: none;
    cursor: pointer;
    text-decoration: none;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
    color: var(--text-inverse);
}

.cta-button:focus {
    outline: 2px solid var(--white);
    outline-offset: 2px;
}

/* Card System */
.card {
    background: var(--surface-raised);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: var(--gray-300);
}

.card-elevated {
    box-shadow: var(--shadow-lg);
    border: none;
}

.card-header {
    display: flex;
    align-items: center;
    margin-bottom: 1.5rem;
}

.card-icon {
    width: 48px;
    height: 48px;
    background: var(--gradient-accent);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 1rem;
    color: var(--text-inverse);
    font-weight: 600;
    font-size: var(--font-size-lg);
}

.card-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0;
}

.card-meta {
    color: var(--text-muted);
    font-size: var(--font-size-sm);
    margin-bottom: 1rem;
    font-weight: 500;
}

.card-excerpt {
    color: var(--text-secondary);
    line-height: var(--leading-relaxed);
}

/* Section Styling */
.homepage-section {
    padding: 6rem 0;
}

.homepage-section:nth-child(even) {
    background-color: var(--surface);
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
    letter-spacing: -0.025em;
}

.section-subtitle {
    font-size: var(--font-size-xl);
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto;
    line-height: var(--leading-relaxed);
}

/* Grid Layouts */
.featured-posts {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.featured-post {
    background: var(--surface-raised);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 1px solid var(--border);
}

.featured-post:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-6px);
}

.featured-post-image {
    width: 100%;
    height: 240px;
    object-fit: cover;
}

.featured-post-content {
    padding: 2rem;
}

.featured-post-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
    line-height: var(--leading-snug);
}

.featured-post-meta {
    color: var(--text-muted);
    font-size: var(--font-size-sm);
    margin-bottom: 1rem;
    font-weight: 500;
}

.featured-post-excerpt {
    color: var(--text-secondary);
    line-height: var(--leading-relaxed);
}

/* AI Writers Grid */
.ai-writers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.ai-writer-card {
    background: var(--surface-raised);
    border-radius: var(--border-radius-lg);
    padding: 2.5rem;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.ai-writer-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-accent);
    transform: scaleX(0);
    transition: var(--transition);
}

.ai-writer-card:hover::before {
    transform: scaleX(1);
}

.ai-writer-card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-8px);
}

.ai-writer-avatar {
    width: 96px;
    height: 96px;
    background: var(--gradient-accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: var(--font-size-3xl);
    color: var(--text-inverse);
    font-weight: 700;
    box-shadow: var(--shadow-lg);
}

.ai-writer-name {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.ai-writer-specialty {
    color: var(--text-secondary);
    font-style: italic;
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.ai-writer-description {
    color: var(--text-secondary);
    line-height: var(--leading-relaxed);
}

/* Culture Pulse */
.culture-pulse {
    background: var(--surface);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    border: 1px solid var(--border);
}

.pulse-item {
    padding: 1.5rem;
    border-left: 4px solid var(--accent-color);
    margin-bottom: 1.5rem;
    background: var(--surface-raised);
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.pulse-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(4px);
}

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

.pulse-time {
    color: var(--text-muted);
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.pulse-title {
    font-weight: 600;
    color: var(--text-primary);
    margin: 0.75rem 0;
    font-size: var(--font-size-lg);
}

.pulse-excerpt {
    color: var(--text-secondary);
    font-size: var(--font-size-base);
    line-height: var(--leading-relaxed);
}

/* Newsletter Form */
.newsletter-form {
    background: var(--gradient-hero);
    color: var(--text-inverse);
    padding: 4rem 2rem;
    border-radius: var(--border-radius-xl);
    text-align: center;
    margin: 4rem 0;
    position: relative;
    overflow: hidden;
}

.newsletter-form::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 30%, rgba(59, 130, 246, 0.15) 0%, transparent 50%);
    pointer-events: none;
}

.newsletter-form h3 {
    font-size: var(--font-size-3xl);
    margin-bottom: 1rem;
    color: var(--text-inverse);
    position: relative;
    z-index: 1;
}

.newsletter-form p {
    margin-bottom: 2rem;
    opacity: 0.9;
    color: var(--text-inverse);
    font-size: var(--font-size-lg);
    position: relative;
    z-index: 1;
}

.form-group {
    display: flex;
    gap: 1rem;
    max-width: 500px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.form-group input {
    flex: 1;
    padding: 1rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    background: var(--surface-raised);
    box-shadow: var(--shadow-md);
}

.form-group input:focus {
    outline: 2px solid var(--white);
    outline-offset: 2px;
}

.form-group button {
    background: var(--surface-raised);
    color: var(--text-primary);
    border: none;
    padding: 1rem 2rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
}

.form-group button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Footer */
.site-footer {
    background: var(--navy-900);
    color: var(--text-inverse);
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-section h4 {
    color: var(--text-inverse);
    margin-bottom: 1.5rem;
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.75rem;
}

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.8);
    transition: var(--transition);
    font-weight: 500;
}

.footer-section ul li a:hover {
    color: var(--text-inverse);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
    text-align: center;
    color: rgba(255, 255, 255, 0.7);
}

/* ============================================================================
   COLLABORATION SECTION STYLES
   ============================================================================ */

/* Application Form */
.collab-application-form {
    max-width: 900px;
    margin: 0 auto;
    background: var(--surface-raised);
    padding: 3rem;
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border);
}

.form-section {
    margin-bottom: 3rem;
    padding: 2.5rem;
    background: var(--surface);
    border-radius: var(--border-radius-lg);
    border-left: 6px solid var(--accent-color);
    border: 1px solid var(--border-light);
}

.form-section h3 {
    color: var(--text-primary);
    margin-bottom: 2rem;
    font-size: var(--font-size-2xl);
    font-weight: 600;
}

.form-group {
    margin-bottom: 2rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.75rem;
    font-weight: 600;
    color: var(--text-primary);
    font-size: var(--font-size-base);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 1rem 1.5rem;
    border: 2px solid var(--border);
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    font-family: inherit;
    transition: var(--transition);
    background-color: var(--surface-raised);
    color: var(--text-primary);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
    background-color: var(--surface-raised);
}

.form-group textarea {
    resize: vertical;
    min-height: 150px;
    line-height: var(--leading-relaxed);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.checkbox-label {
    display: flex !important;
    align-items: flex-start;
    gap: 1rem;
    cursor: pointer;
    font-weight: 500 !important;
    padding: 1.5rem;
    background: var(--surface);
    border-radius: var(--border-radius);
    border: 2px solid var(--border);
    margin-bottom: 1rem;
    transition: var(--transition);
}

.checkbox-label:hover {
    border-color: var(--accent-color);
    background: var(--surface-raised);
}

.checkbox-label input[type="checkbox"] {
    width: auto !important;
    margin: 0 !important;
    flex-shrink: 0;
    transform: scale(1.25);
    accent-color: var(--accent-color);
}

.submit-button {
    background: var(--gradient-accent);
    color: var(--text-inverse);
    border: none;
    padding: 1.25rem 3rem;
    border-radius: var(--border-radius);
    font-size: var(--font-size-lg);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    width: 100%;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    box-shadow: var(--shadow-lg);
}

.submit-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

/* Status Messages */
.success-message,
.error-message {
    padding: 2rem;
    border-radius: var(--border-radius-lg);
    margin: 2rem 0;
    text-align: center;
    box-shadow: var(--shadow-md);
}

.success-message {
    background: var(--success-color);
    color: var(--text-inverse);
}

.error-message {
    background: #ef4444;
    color: var(--text-inverse);
}

.success-message h4,
.error-message h4 {
    color: var(--text-inverse);
    margin-bottom: 0.5rem;
    font-size: var(--font-size-xl);
}

/* Collaboration Cards */
.collab-projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.collab-project-card {
    background: var(--surface-raised);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 1px solid var(--border);
    position: relative;
}

.collab-project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    width: 4px;
    background: var(--gradient-accent);
    transform: scaleY(0);
    transition: var(--transition);
}

.collab-project-card:hover::before {
    transform: scaleY(1);
}

.collab-project-card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-8px);
}

.collab-project-header {
    padding: 2rem;
    background: var(--surface);
}

.collab-project-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.collab-contributor {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
    color: var(--text-primary);
    font-size: var(--font-size-sm);
}

.collab-ai-tool {
    background: var(--gradient-accent);
    color: var(--text-inverse);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.collab-project-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: 1rem;
    line-height: var(--leading-snug);
}

.collab-project-title a {
    color: var(--text-primary);
    text-decoration: none;
}

.collab-project-title a:hover {
    color: var(--accent-color);
}

.collab-project-excerpt {
    color: var(--text-secondary);
    line-height: var(--leading-relaxed);
    margin-bottom: 1.5rem;
}

.collab-project-footer {
    padding: 1.5rem 2rem;
    background: var(--surface-raised);
    border-top: 1px solid var(--border-light);
}

.collab-method-tag {
    background: var(--gray-100);
    color: var(--text-secondary);
    padding: 0.375rem 0.75rem;
    border-radius: 6px;
    font-size: var(--font-size-xs);
    font-weight: 500;
    margin-right: 0.75rem;
}

/* Collaboration Hero */
.collab-hero {
    background: var(--gradient-hero);
    color: var(--text-inverse);
    padding: 4rem 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.collab-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 40% 60%, rgba(59, 130, 246, 0.15) 0%, transparent 50%);
    pointer-events: none;
}

.collab-hero-content {
    position: relative;
    z-index: 1;
}

.collab-hero-content h1 {
    color: var(--text-inverse);
    margin-bottom: 2rem;
    font-size: var(--font-size-4xl);
}

.collab-hero-meta {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
    margin-top: 2rem;
}

.collab-hero-meta span {
    background: rgba(255, 255, 255, 0.15);
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    backdrop-filter: blur(10px);
    font-weight: 500;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

/* Process Documentation */
.collab-process-section {
    background: var(--surface);
    padding: 2.5rem;
    border-radius: var(--border-radius-lg);
    margin: 3rem 0;
    border-left: 6px solid var(--accent-color);
    border: 1px solid var(--border);
}

.collab-process-section h3 {
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    font-size: var(--font-size-2xl);
}

.prompt-iteration {
    background: var(--surface-raised);
    padding: 2rem;
    border-radius: var(--border-radius);
    margin: 1.5rem 0;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}

.prompt-iteration h4 {
    color: var(--accent-color);
    margin-bottom: 1rem;
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.prompt-text {
    background: var(--gray-50);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    font-family: 'JetBrains Mono', monospace;
    font-size: var(--font-size-sm);
    margin: 1rem 0;
    border-left: 4px solid var(--accent-color);
    color: var(--text-primary);
    line-height: var(--leading-relaxed);
}

.ai-response {
    background: #f0fdf4;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    margin: 1rem 0;
    border-left: 4px solid var(--success-color);
    color: var(--text-primary);
    line-height: var(--leading-relaxed);
}

/* Contributor Profile */
.contributor-profile {
    background: var(--surface);
    padding: 3rem;
    border-radius: var(--border-radius-lg);
    margin: 3rem 0;
    text-align: center;
    border: 1px solid var(--border);
}

.contributor-avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    margin: 0 auto 2rem;
    background: var(--gradient-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-3xl);
    color: var(--text-inverse);
    font-weight: 700;
    box-shadow: var(--shadow-lg);
}

.contributor-name {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.contributor-title {
    color: var(--text-secondary);
    font-style: italic;
    margin-bottom: 1.5rem;
    font-size: var(--font-size-lg);
    font-weight: 500;
}

.contributor-bio {
    color: var(--text-secondary);
    line-height: var(--leading-relaxed);
    max-width: 700px;
    margin: 0 auto;
    font-size: var(--font-size-lg);
}

/* Social Sharing */
.collab-social-sharing {
    background: var(--surface);
    padding: 2.5rem;
    border-radius: var(--border-radius-lg);
    margin: 3rem 0;
    text-align: center;
    border: 1px solid var(--border);
}

.collab-social-sharing h4 {
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-size: var(--font-size-xl);
}

.social-share-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 2rem;
}

.social-share-button {
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: var(--font-size-sm);
    box-shadow: var(--shadow-md);
}

.social-share-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.share-twitter {
    background: #1DA1F2;
    color: var(--text-inverse);
}

.share-linkedin {
    background: #0077B5;
    color: var(--text-inverse);
}

.share-email {
    background: var(--gray-600);
    color: var(--text-inverse);
}

/* Filters */
.collab-filters {
    background: var(--surface);
    padding: 2rem;
    border-radius: var(--border-radius-lg);
    margin-bottom: 3rem;
    border: 1px solid var(--border);
}

.filter-row {
    display: flex;
    gap: 2rem;
    align-items: end;
    flex-wrap: wrap;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    min-width: 200px;
}

.filter-group label {
    font-weight: 600;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.filter-group select,
.filter-group input {
    padding: 0.75rem 1rem;
    border: 2px solid var(--border);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    background: var(--surface-raised);
    color: var(--text-primary);
    transition: var(--transition);
}

.filter-group select:focus,
.filter-group input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Article Styles */
.article-header {
    text-align: center;
    padding: 3rem 0;
    border-bottom: 1px solid var(--border);
    margin-bottom: 3rem;
    background: var(--surface);
}

.article-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    letter-spacing: -0.025em;
}

.article-meta {
    color: var(--text-muted);
    font-size: var(--font-size-sm);
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
    font-weight: 500;
}

.article-meta span {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.article-content {
    max-width: 800px;
    margin: 0 auto;
    font-size: var(--font-size-lg);
    line-height: var(--leading-loose);
}

.article-content h2,
.article-content h3,
.article-content h4 {
    margin: 3rem 0 1.5rem;
    color: var(--text-primary);
}

.article-content blockquote {
    border-left: 4px solid var(--accent-color);
    padding-left: 2rem;
    margin: 3rem 0;
    font-style: italic;
    color: var(--text-secondary);
    background: var(--surface);
    padding: 2rem;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    font-size: var(--font-size-lg);
}

.article-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius-lg);
    margin: 3rem 0;
    box-shadow: var(--shadow-lg);
}

/* Archive Pages */
.archive-header {
    text-align: center;
    padding: 4rem 0;
    background: var(--surface);
    margin-bottom: 4rem;
}

.archive-title {
    font-size: var(--font-size-4xl);
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    font-weight: 700;
}

.archive-description {
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto;
    font-size: var(--font-size-lg);
    line-height: var(--leading-relaxed);
}

.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.post-card {
    background: var(--surface-raised);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 1px solid var(--border);
}

.post-card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-6px);
}

.post-card-image {
    width: 100%;
    height: 240px;
    object-fit: cover;
}

.post-card-content {
    padding: 2rem;
}

.post-card-category {
    display: inline-block;
    background: var(--gradient-accent);
    color: var(--text-inverse);
    padding: 0.375rem 1rem;
    border-radius: 20px;
    font-size: var(--font-size-xs);
    font-weight: 600;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.post-card-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
    line-height: var(--leading-snug);
}

.post-card-title a {
    color: inherit;
}

.post-card-title a:hover {
    color: var(--accent-color);
}

.post-card-meta {
    color: var(--text-muted);
    font-size: var(--font-size-sm);
    margin-bottom: 1rem;
    font-weight: 500;
}

.post-card-excerpt {
    color: var(--text-secondary);
    line-height: var(--leading-relaxed);
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin: 4rem 0;
}

.pagination a,
.pagination span {
    padding: 1rem 1.25rem;
    border-radius: var(--border-radius);
    border: 2px solid var(--border);
    color: var(--text-primary);
    transition: var(--transition);
    font-weight: 500;
    background: var(--surface-raised);
}

.pagination a:hover,
.pagination .current {
    background: var(--accent-color);
    color: var(--text-inverse);
    border-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Search Form */
.search-form {
    position: relative;
    max-width: 500px;
}

.search-form input {
    width: 100%;
    padding: 1rem 4rem 1rem 1.5rem;
    border: 2px solid var(--border);
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    transition: var(--transition);
    background: var(--surface-raised);
    color: var(--text-primary);
}

.search-form input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.search-form button {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.75rem;
    font-size: var(--font-size-lg);
}

/* Contact Section */
.contact-section {
    background: var(--surface);
    padding: 6rem 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.contact-item {
    background: var(--surface-raised);
    padding: 2.5rem;
    border-radius: var(--border-radius-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 1px solid var(--border);
}

.contact-item:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-6px);
}

.contact-icon {
    width: 72px;
    height: 72px;
    background: var(--gradient-accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: var(--font-size-2xl);
    color: var(--text-inverse);
    box-shadow: var(--shadow-lg);
}

.contact-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.contact-details {
    color: var(--text-secondary);
    line-height: var(--leading-relaxed);
}

/* Mobile Navigation */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: var(--font-size-2xl);
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.nav-toggle:hover {
    background: var(--surface);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .container {
        padding: 0 1.5rem;
    }
    
    .hero-section {
        padding: 4rem 0;
    }
    
    .homepage-section {
        padding: 4rem 0;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }
    
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .section-title {
        font-size: var(--font-size-3xl);
    }
    
    .main-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--surface-raised);
        box-shadow: var(--shadow-xl);
        padding: 1.5rem;
        border-radius: 0 0 var(--border-radius-lg) var(--border-radius-lg);
        border: 1px solid var(--border);
        border-top: none;
    }
    
    .main-nav.active {
        display: block;
    }
    
    .main-nav ul {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-toggle {
        display: block;
    }
    
    .form-group {
        flex-direction: column;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .featured-posts,
    .posts-grid,
    .ai-writers-grid,
    .collab-projects-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .collab-hero-meta {
        flex-direction: column;
        gap: 1rem;
    }
    
    .social-share-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .filter-row {
        flex-direction: column;
        align-items: stretch;
    }
    
    .filter-group {
        min-width: auto;
    }
    
    .article-meta {
        justify-content: flex-start;
        flex-direction: column;
        gap: 0.75rem;
        text-align: left;
    }
    
    .row {
        margin: 0;
    }
    
    .col {
        padding: 0;
        flex: 0 0 100%;
    }
    
    .collab-application-form {
        padding: 2rem;
    }
    
    .form-section {
        padding: 2rem;
    }
    
    .contributor-profile {
        padding: 2rem;
    }
}

@media (max-width: 480px) {
    .hero-section {
        padding: 3rem 0;
    }
    
    .homepage-section {
        padding: 3rem 0;
    }
    
    .card {
        padding: 1.5rem;
    }
    
    .newsletter-form {
        padding: 3rem 1.5rem;
    }
    
    .site-footer {
        padding: 3rem 0 1.5rem;
    }
    
    h1 { font-size: var(--font-size-3xl); }
    h2 { font-size: var(--font-size-2xl); }
    h3 { font-size: var(--font-size-xl); }
    
    .collab-application-form {
        padding: 1.5rem;
    }
    
    .form-section {
        padding: 1.5rem;
    }
}

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

/* Enhanced Focus Styles */
a:focus,
button:focus,
input:focus,
textarea:focus,
select:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
    border-radius: 4px;
}

/* Skip Link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--navy-900);
    color: var(--text-inverse);
    padding: 8px;
    border-radius: 4px;
    text-decoration: none;
    z-index: 10000;
    font-weight: 600;
}

.skip-link:focus {
    top: 6px;
}

/* Print Styles */
@media print {
    .site-header,
    .site-footer,
    .newsletter-form,
    .cta-button,
    .social-share-buttons,
    .collab-filters {
        display: none;
    }
    
    body {
        color: black;
        background: white;
        font-size: 12pt;
        line-height: 1.5;
    }
    
    .article-content {
        max-width: none;
    }
    
    h1, h2, h3, h4, h5, h6 {
        color: black;
        page-break-after: avoid;
    }
    
    p, blockquote {
        orphans: 3;
        widows: 3;
    }
    
    blockquote {
        page-break-inside: avoid;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #f8fafc;
        --text-secondary: #cbd5e1;
        --text-muted: #94a3b8;
        --text-light: #64748b;
        --background: #0f172a;
        --surface: #1e293b;
        --surface-raised: #334155;
        --border: #475569;
        --border-light: #334155;
    }
}

/* Animation Utilities */
.fade-in {
    animation: fadeInUp 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.loading-spinner {
    display: inline-block;
    width: 24px;
    height: 24px;
    border: 2px solid var(--border);
    border-radius: 50%;
    border-top-color: var(--accent-color);
    animation: spin 1s linear infinite;
}

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

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.p-0 { padding: 0; }
.p-1 { padding: 0.5rem; }
.p-2 { padding: 1rem; }
.p-3 { padding: 1.5rem; }
.p-4 { padding: 2rem; }

.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }
.flex { display: flex; }
.grid { display: grid; }