/* Dark Theme Variables */
:root {
    --primary-color: #3b82f6;
    --primary-text: #ffffff;
    --accent-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    
    --main-bg: #0f172a;
    --sidebar-bg: #1e293b;
    --nav-bg: rgba(30, 41, 59, 0.8);
    --card-bg: #334155;
    --hero-bg: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    
    --button-bg: #475569;
    --button-hover-bg: #64748b;
    --tab-bg: #475569;
    --tab-hover-bg: #64748b;
    
    --text-color: #f1f5f9;
    --text-secondary: #cbd5e1;
    --heading-color: #ffffff;
    
    --border-color: #475569;
    --icon-filter: brightness(0.9);
    
    --cyber-blue: #00d4ff;
    --cyber-green: #00ff88;
    --cyber-purple: #8b5cf6;
}

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

body {
    background: var(--main-bg);
    color: var(--text-color);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
}

/* Sidebar Styles */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: 300px;
    height: 100vh;
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    z-index: 1000;
    transition: transform 0.3s ease;
}

.sidebar-content {
    padding: 20px;
}

/* Brand Section */
.brand-section {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px 0;
}

.brand-logo {
    font-size: 48px;
    color: var(--cyber-blue);
    margin-bottom: 15px;
}

.brand-section h1 {
    font-size: 24px;
    color: var(--heading-color);
    margin-bottom: 10px;
    font-weight: 700;
}

.brand-section p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 5px;
}

/* Navigation */
.main-navigation ul {
    list-style: none;
}

.main-navigation li {
    margin-bottom: 5px;
}

.nav-link {
    display: flex;
    align-items: center;
    padding: 12px 15px;
    color: var(--text-color);
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.3s ease;
    font-size: 14px;
}

.nav-link:hover {
    background: var(--button-bg);
    color: var(--cyber-blue);
}

.nav-link.active {
    background: var(--primary-color);
    color: white;
}

.nav-link i {
    margin-right: 12px;
    width: 16px;
    text-align: center;
}

/* Social Section */
.social-section {
    margin-top: 30px;
    display: flex;
    justify-content: center;
    gap: 15px;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--button-bg);
    color: var(--text-color);
    text-decoration: none;
    border-radius: 50%;
    transition: all 0.3s ease;
}

.social-link:hover {
    background: var(--primary-color);
    transform: translateY(-2px);
}

/* Main Content */
.main-content {
    margin-left: 300px;
    padding: 40px;
    min-height: 100vh;
}

.content-section {
    display: none;
    animation: fadeIn 0.5s ease;
}

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

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Hero Section */
.hero-section {
    text-align: center;
    padding: 60px 0;
    background: var(--hero-bg);
    border-radius: 15px;
    margin-bottom: 40px;
}

.hero-section h1 {
    font-size: 48px;
    color: var(--heading-color);
    margin-bottom: 20px;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    margin: 40px 0;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.stat-card {
    background: var(--card-bg);
    padding: 30px 20px;
    border-radius: 12px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-card i {
    font-size: 36px;
    color: var(--cyber-blue);
    margin-bottom: 15px;
}

.stat-card h3 {
    color: var(--heading-color);
    margin-bottom: 10px;
    font-size: 18px;
}

.stat-number {
    font-size: 32px;
    font-weight: bold;
    color: var(--cyber-green);
    margin-bottom: 5px;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 14px;
}

/* CTA Section */
.cta-section {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-top: 40px;
}

.cta-button {
    padding: 15px 30px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 10px;
}

.cta-button.primary {
    background: var(--primary-color);
    color: white;
}

.cta-button.secondary {
    background: transparent;
    color: var(--text-color);
    border: 2px solid var(--border-color);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(59, 130, 246, 0.3);
}

/* Content Sections */
.content-section h2 {
    font-size: 32px;
    color: var(--heading-color);
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.content-section h2 i {
    color: var(--cyber-blue);
}

/* Content Placeholder */
.content-placeholder {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.placeholder-card {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease;
}

.placeholder-card:hover {
    transform: translateY(-3px);
}

.placeholder-card h3 {
    color: var(--heading-color);
    margin-bottom: 15px;
    font-size: 20px;
}

.placeholder-card p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

/* Topic Tags */
.topics-preview {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.topic-tag {
    background: var(--primary-color);
    color: white;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}

/* Contributors */
.contributors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.contributor-card, .contributor-placeholder {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease;
}

.contributor-card:hover, .contributor-placeholder:hover {
    transform: translateY(-3px);
}

.contributor-avatar, .placeholder-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--button-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 32px;
    color: var(--text-color);
}

.placeholder-avatar {
    border: 2px dashed var(--border-color);
    color: var(--text-secondary);
}

.contributor-card h3, .contributor-placeholder h3 {
    color: var(--heading-color);
    margin-bottom: 10px;
}

.contributor-card p, .contributor-placeholder p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.contributor-links {
    display: flex;
    justify-content: center;
    gap: 15px;
}

.contributor-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 35px;
    height: 35px;
    background: var(--button-bg);
    color: var(--text-color);
    text-decoration: none;
    border-radius: 50%;
    transition: all 0.3s ease;
}

.contributor-link:hover {
    background: var(--primary-color);
}

.contribute-btn {
    background: var(--cyber-green);
    color: var(--main-bg);
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0 auto;
}

.contribute-btn:hover {
    background: var(--cyber-blue);
    transform: translateY(-2px);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 1001;
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 18px;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--main-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--button-bg);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--button-hover-bg);
}