/* ===================================
   Level Up Synergy - Main Stylesheet
   Modern, Professional Design System
   =================================== */

/* CSS Variables for Design System */
:root {
    /* Color Palette */
    --color-primary: #667eea;
    --color-primary-dark: #5568d3;
    --color-secondary: #764ba2;
    --color-accent: #f093fb;
    --color-success: #48bb78;
    --color-warning: #f6ad55;
    --color-error: #f56565;
    
    /* Gradient */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-success: linear-gradient(135deg, #48bb78 0%, #38a169 100%);
    
    /* Text Colors */
    --color-text-primary: #1a202c;
    --color-text-secondary: #4a5568;
    --color-text-muted: #718096;
    
    /* Background Colors */
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f7fafc;
    --color-bg-tertiary: #edf2f7;
    --color-bg-dark: #1a202c;
    
    /* Border & Shadow */
    --color-border: #e2e8f0;
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Poppins', 'Inter', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Z-index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal: 1040;
    --z-tooltip: 1050;
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --color-text-primary: #f7fafc;
    --color-text-secondary: #e2e8f0;
    --color-text-muted: #a0aec0;
    
    --color-bg-primary: #1a202c;
    --color-bg-secondary: #2d3748;
    --color-bg-tertiary: #4a5568;
    
    --color-border: #4a5568;
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.3);
}

/* ===================================
   Reset & Base Styles
   =================================== */

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    transition: background-color var(--transition-base), color var(--transition-base);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* ===================================
   Container & Layout
   =================================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
}

.section {
    padding: var(--spacing-3xl) 0;
}

@media (max-width: 768px) {
    .section {
        padding: var(--spacing-2xl) 0;
    }
}

/* ===================================
   Navigation
   =================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--color-bg-primary);
    box-shadow: var(--shadow-sm);
    z-index: var(--z-sticky);
    transition: all var(--transition-base);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.95);
}

[data-theme="dark"] .navbar.scrolled {
    background-color: rgba(26, 32, 44, 0.95);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-primary);
    display: flex;
    align-items: center;
    gap: 0.25rem;
    transition: transform var(--transition-fast);
}

.logo:hover {
    transform: scale(1.05);
}

.logo-bracket {
    color: var(--color-primary);
}

.logo-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.nav-link {
    color: var(--color-text-secondary);
    font-weight: 500;
    position: relative;
    padding: var(--spacing-sm) 0;
    transition: color var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-base);
}

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

.nav-link.active::after {
    width: 100%;
}

.theme-toggle {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    transform: scale(1.1);
    background: var(--color-bg-tertiary);
}

.theme-icon {
    font-size: 1.25rem;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 0.25rem;
    padding: var(--spacing-sm);
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--color-text-primary);
    transition: all var(--transition-fast);
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 60px;
        right: -100%;
        width: 100%;
        max-width: 300px;
        background-color: var(--color-bg-primary);
        box-shadow: var(--shadow-lg);
        flex-direction: column;
        align-items: flex-start;
        padding: var(--spacing-xl);
        transition: right var(--transition-base);
    }
    
    .nav-links.active {
        right: 0;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .mobile-menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .mobile-menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .mobile-menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
}

/* ===================================
   Hero Section
   =================================== */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
    padding-top: 60px;
}

.hero-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.code-rain {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
    opacity: 0.1;
}

.hero-container {
    position: relative;
    z-index: 2;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.8s ease;
}

.hero-title-main {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    line-height: 1.2;
    color: var(--color-text-primary);
}

.highlight-number {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 1.2em;
}

.hero-subtitle {
    font-family: var(--font-heading);
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 0.8s ease 0.2s backwards;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-2xl);
    animation: fadeInUp 0.8s ease 0.4s backwards;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 0.6s backwards;
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-2xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text-muted);
    font-size: 0.875rem;
    animation: fadeIn 1s ease 1s backwards;
}

.scroll-arrow {
    width: 24px;
    height: 24px;
    border-left: 2px solid var(--color-primary);
    border-bottom: 2px solid var(--color-primary);
    transform: rotate(-45deg);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: rotate(-45deg) translateY(0); }
    40% { transform: rotate(-45deg) translateY(10px); }
    60% { transform: rotate(-45deg) translateY(5px); }
}

/* ===================================
   Buttons
   =================================== */

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 1rem;
    transition: all var(--transition-base);
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

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

.btn-outline:hover {
    background: var(--color-primary);
    color: white;
}

.btn-small {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
}

.btn-large {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: 1.125rem;
}

.btn-block {
    width: 100%;
    justify-content: center;
}

.btn-icon {
    width: 20px;
    height: 20px;
}

.btn-icon-small {
    width: 16px;
    height: 16px;
}

/* ===================================
   Section Headers
   =================================== */

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-title {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.section-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--color-text-secondary);
}

.page-title {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-subtitle {
    font-size: clamp(1rem, 2vw, 1.5rem);
    color: var(--color-text-secondary);
}

/* ===================================
   Mission Section
   =================================== */

.mission-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3xl);
}

.mission-statement {
    text-align: center;
}

.mission-text {
    font-size: 1.25rem;
    line-height: 1.8;
    color: var(--color-text-secondary);
    max-width: 900px;
    margin: 0 auto;
}

.animated-counter {
    font-weight: 700;
    color: var(--color-primary);
}

.timeline-container {
    padding: var(--spacing-xl) 0;
}

.timeline {
    display: flex;
    justify-content: space-around;
    align-items: flex-start;
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 20px;
    left: 10%;
    right: 10%;
    height: 4px;
    background: var(--gradient-primary);
    z-index: 0;
}

.timeline-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    position: relative;
    z-index: 1;
}

.timeline-marker {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--gradient-primary);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-md);
    animation: pulse 2s infinite;
}

.timeline-content h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-primary);
}

.timeline-content p {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

@media (max-width: 768px) {
    .timeline {
        flex-direction: column;
        gap: var(--spacing-2xl);
    }
    
    .timeline::before {
        top: 0;
        left: 20px;
        right: auto;
        bottom: 0;
        width: 4px;
        height: 100%;
    }
    
    .timeline-item {
        flex-direction: row;
        text-align: left;
        gap: var(--spacing-md);
    }
}

.impact-metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.metric-card {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    text-align: center;
    transition: all var(--transition-base);
    border: 2px solid transparent;
}

.metric-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.metric-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.metric-number {
    font-family: var(--font-heading);
    font-size: 3rem;
    font-weight: 800;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.metric-label {
    font-size: 1rem;
    color: var(--color-text-secondary);
    font-weight: 600;
}

/* ===================================
   Featured Content Carousel
   =================================== */

.carousel-container {
    position: relative;
    overflow: hidden;
    padding: var(--spacing-xl) 0;
}

.carousel {
    display: flex;
    gap: var(--spacing-xl);
    overflow-x: hidden;
    scroll-behavior: smooth;
}

.carousel-item {
    min-width: 100%;
    opacity: 0;
    transform: translateX(100%);
    transition: all var(--transition-slow);
}

.carousel-item.active {
    opacity: 1;
    transform: translateX(0);
}

.featured-card {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    max-width: 800px;
    margin: 0 auto;
}

.featured-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.featured-image {
    position: relative;
    height: 400px;
    overflow: hidden;
}

.featured-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.featured-card:hover .featured-image img {
    transform: scale(1.05);
}

.featured-badge {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: var(--gradient-primary);
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
}

.featured-details {
    padding: var(--spacing-xl);
}

.featured-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.featured-description {
    font-size: 1rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.featured-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.contributor-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.contributor-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 3px solid var(--color-primary);
}

.contributor-name {
    font-weight: 600;
    color: var(--color-text-primary);
}

.featured-date {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.carousel-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.carousel-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--color-bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.carousel-btn:hover {
    background: var(--gradient-primary);
    transform: scale(1.1);
}

.carousel-btn:hover svg {
    stroke: white;
}

.carousel-btn svg {
    width: 24px;
    height: 24px;
    stroke: var(--color-text-primary);
}

.carousel-indicators {
    display: flex;
    gap: var(--spacing-sm);
}

.carousel-indicator {
    width: 40px;
    height: 4px;
    background: var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.carousel-indicator.active {
    background: var(--gradient-primary);
    width: 60px;
}

@media (max-width: 768px) {
    .featured-image {
        height: 250px;
    }
    
    .featured-meta {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: flex-start;
    }
}

/* ===================================
   Footer
   =================================== */

.footer {
    background: var(--color-bg-dark);
    color: #e2e8f0;
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
    margin-top: var(--spacing-3xl);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.footer-main {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-2xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-column {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.footer-logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
    margin-bottom: var(--spacing-sm);
}

.footer-description {
    color: #a0aec0;
    line-height: 1.6;
}

.footer-location {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: #a0aec0;
}

.location-icon {
    width: 20px;
    height: 20px;
    stroke: var(--color-primary);
}

.footer-heading {
    font-size: 1.125rem;
    font-weight: 600;
    color: white;
    margin-bottom: var(--spacing-sm);
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-links a {
    color: #a0aec0;
    transition: color var(--transition-fast);
}

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

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.social-link {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.social-link:hover {
    background: var(--gradient-primary);
    transform: translateY(-3px);
}

.social-link svg {
    width: 20px;
    height: 20px;
    fill: white;
}

.footer-contact {
    color: #a0aec0;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-copyright {
    color: #a0aec0;
}

.heart {
    color: #f56565;
    animation: heartbeat 1.5s infinite;
}

@keyframes heartbeat {
    0%, 100% { transform: scale(1); }
    10% { transform: scale(1.2); }
    20% { transform: scale(1); }
}

.footer-bottom-links {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-bottom-links a {
    color: #a0aec0;
    font-size: 0.875rem;
}

@media (max-width: 768px) {
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

/* ===================================
   Contributors Page
   =================================== */

.contributors-hero,
.content-hero {
    background: var(--gradient-primary);
    color: white;
    padding: calc(60px + var(--spacing-3xl)) 0 var(--spacing-3xl);
    text-align: center;
}

.contributors-hero .page-title,
.content-hero .page-title {
    color: white;
    -webkit-text-fill-color: white;
}

.contributors-hero .page-subtitle,
.content-hero .page-subtitle {
    color: rgba(255, 255, 255, 0.9);
}

.stats-dashboard {
    background: var(--color-bg-secondary);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-3xl);
}

.stat-card {
    background: var(--color-bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.stat-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.stat-value {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.stat-label {
    font-size: 1rem;
    color: var(--color-text-secondary);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.stat-trend {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.stat-trend.positive {
    color: var(--color-success);
}

.tech-stack-section {
    margin-bottom: var(--spacing-3xl);
}

.tech-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
    padding: var(--spacing-xl) 0;
}

.tech-tag {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-lg);
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    font-weight: 600;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.tech-tag:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    background: var(--gradient-primary);
    color: white;
}

.tech-tag.size-small {
    font-size: 0.875rem;
}

.tech-tag.size-medium {
    font-size: 1rem;
}

.tech-tag.size-large {
    font-size: 1.25rem;
}

.leaderboard-section {
    margin-top: var(--spacing-3xl);
}

.leaderboard {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    max-width: 800px;
    margin: 0 auto;
}

.leaderboard-item {
    background: var(--color-bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.leaderboard-item:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow-lg);
}

.leaderboard-item.rank-1 {
    border: 2px solid #ffd700;
}

.leaderboard-item.rank-2 {
    border: 2px solid #c0c0c0;
}

.leaderboard-item.rank-3 {
    border: 2px solid #cd7f32;
}

.rank-badge {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 800;
}

.leaderboard-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    border: 3px solid var(--color-primary);
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.leaderboard-avatar .avatar-initials {
    font-size: 1.25rem;
    font-weight: 700;
    color: white;
}

.leaderboard-info {
    flex: 1;
}

.leaderboard-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.leaderboard-role {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.leaderboard-stats {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.contribution-count {
    font-weight: 600;
    color: var(--color-text-primary);
}

.badge-icon {
    font-size: 1.5rem;
}

.badge-icon.gold {
    filter: drop-shadow(0 0 8px rgba(255, 215, 0, 0.5));
}

.contributors-section {
    background: var(--color-bg-primary);
}

.contributors-controls {
    margin-bottom: var(--spacing-2xl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.search-container {
    position: relative;
    max-width: 600px;
    width: 100%;
}

.search-icon {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    stroke: var(--color-text-muted);
}

.search-input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) calc(var(--spacing-md) + 30px);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
    transition: all var(--transition-fast);
}

.search-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.filter-controls {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.filter-select {
    padding: var(--spacing-md) var(--spacing-lg);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-select:focus {
    outline: none;
    border-color: var(--color-primary);
}

.btn-reset {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
    font-weight: 600;
    transition: all var(--transition-fast);
}

.btn-reset:hover {
    background: var(--color-primary);
    color: white;
}

.contributors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    min-height: 400px;
}

.contributor-card {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    text-align: center;
    transition: all var(--transition-base);
    border: 2px solid transparent;
    cursor: pointer;
}

.contributor-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-primary);
}

.contributor-avatar-large {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    margin: 0 auto var(--spacing-md);
    border: 4px solid var(--color-primary);
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.avatar-initials {
    font-size: 2rem;
    font-weight: 700;
    color: white;
    user-select: none;
}

.contributor-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.contributor-role {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.contributor-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-md) 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.contributor-stat {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-primary);
}

.stat-label-small {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.contributor-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.tech-icon {
    width: 24px;
    height: 24px;
    opacity: 0.7;
    transition: opacity var(--transition-fast);
}

.contributor-card:hover .tech-icon {
    opacity: 1;
}

.contributor-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    opacity: 0;
    transform: translateY(10px);
    transition: all var(--transition-base);
}

.contributor-card:hover .contributor-links {
    opacity: 1;
    transform: translateY(0);
}

.contributor-link {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--color-bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.contributor-link:hover {
    background: var(--gradient-primary);
    transform: scale(1.1);
}

.contributor-link svg {
    width: 18px;
    height: 18px;
    fill: var(--color-text-primary);
}

.contributor-link:hover svg {
    fill: white;
}

.loading-spinner {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    padding: var(--spacing-3xl);
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.load-more-container {
    text-align: center;
    margin-top: var(--spacing-2xl);
}

.contributors-count {
    margin-top: var(--spacing-md);
    color: var(--color-text-muted);
}

.join-section {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
}

.join-content {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--spacing-3xl);
}

.section-description {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-xl);
}

.testimonials-section {
    margin-top: var(--spacing-3xl);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-3xl);
}

.testimonial-card {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.testimonial-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.testimonial-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.testimonial-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    border: 3px solid var(--color-primary);
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.testimonial-avatar .avatar-initials {
    font-size: 1.25rem;
    font-weight: 700;
    color: white;
}

.testimonial-author h4 {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.testimonial-author p {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.testimonial-text {
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.testimonial-rating {
    color: #ffd700;
}

.video-testimonials {
    margin-top: var(--spacing-3xl);
}

.video-testimonials-title {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xl);
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.video-card {
    cursor: pointer;
}

.video-thumbnail {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: var(--spacing-md);
}

.video-thumbnail img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: transform var(--transition-base);
}

.video-card:hover .video-thumbnail img {
    transform: scale(1.1);
}

.play-button {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background: rgba(102, 126, 234, 0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
}

.video-card:hover .play-button {
    transform: translate(-50%, -50%) scale(1.1);
    background: var(--color-primary);
}

.play-button svg {
    width: 24px;
    height: 24px;
    fill: white;
    margin-left: 3px;
}

.video-caption {
    text-align: center;
    font-weight: 600;
    color: var(--color-text-primary);
}

/* ===================================
   Modal
   =================================== */

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: var(--z-modal);
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    backdrop-filter: blur(5px);
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--color-bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--color-bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--color-text-primary);
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--color-error);
    color: white;
    transform: rotate(90deg);
}

.modal-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xl);
    color: var(--color-text-primary);
}

.application-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.form-group label {
    font-weight: 600;
    color: var(--color-text-primary);
}

.form-group input,
.form-group textarea {
    padding: var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: inherit;
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

/* ===================================
   Animations
   =================================== */

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease;
}

.fade-in-up {
    animation: fadeInUp 0.6s ease;
}

/* ===================================
   Utility Classes
   =================================== */

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

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.hidden {
    display: none !important;
}

.visible {
    display: block !important;
}

.no-scroll {
    overflow: hidden;
}

/* ===================================
   Responsive Design
   =================================== */

@media (max-width: 1024px) {
    .hero-title-main {
        font-size: 2.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    .hero {
        min-height: auto;
        padding: calc(60px + var(--spacing-2xl)) 0 var(--spacing-2xl);
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .impact-metrics {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .contributors-grid {
        grid-template-columns: 1fr;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .filter-controls {
        flex-direction: column;
    }
    
    .filter-select,
    .btn-reset {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .logo {
        font-size: 1.25rem;
    }
    
    .hero-title-main {
        font-size: 1.75rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    .section {
        padding: var(--spacing-xl) 0;
    }
    
    .modal-content {
        padding: var(--spacing-lg);
    }
}

/* ===================================
   Print Styles
   =================================== */

@media print {
    .navbar,
    .hero-canvas,
    .code-rain,
    .carousel-controls,
    .btn,
    .footer,
    .modal {
        display: none !important;
    }
    
    body {
        color: #000;
        background: #fff;
    }
    
    .hero {
        min-height: auto;
        padding: 2rem 0;
    }
}

/* ===================================
   Accessibility
   =================================== */

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

:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
}

button:focus-visible,
a:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
}

/* ===================================
   Performance Optimizations
   =================================== */

.lazy-load {
    opacity: 0;
    transition: opacity 0.3s ease;
}

.lazy-load.loaded {
    opacity: 1;
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}