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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

/* Navigation */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: bold;
    color: #667eea;
}

.nav-logo i {
    margin-right: 10px;
    font-size: 1.8rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-menu a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    padding: 10px 15px;
    border-radius: 25px;
    transition: all 0.3s ease;
}

.nav-menu a:hover,
.nav-menu a.active {
    background: #667eea;
    color: white;
    transform: translateY(-2px);
}

/* Main Content */
.main-content {
    margin-top: 70px;
    padding: 40px 20px;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 80px 0;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    margin-bottom: 60px;
    backdrop-filter: blur(10px);
}

.hero h1 {
    font-size: 3.5rem;
    color: white;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
    font-size: 1.5rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 20px;
    font-weight: 300;
}

.hero-description {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.8);
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 15px 30px;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.btn-primary {
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

/* Grid Layouts */
.overview-grid,
.tech-grid,
.links-grid {
    display: grid;
    gap: 30px;
    margin-bottom: 60px;
}

.overview-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.tech-grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.links-grid {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

/* Cards */
.overview-card,
.tech-category {
    background: rgba(255, 255, 255, 0.95);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.overview-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.card-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(45deg, #667eea, #764ba2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.card-icon i {
    font-size: 1.5rem;
    color: white;
}

.overview-card h3,
.tech-category h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: #333;
}

.overview-card p {
    color: #666;
    margin-bottom: 20px;
    line-height: 1.6;
}

.card-link {
    color: #667eea;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.card-link:hover {
    color: #764ba2;
}

/* Tech Stack */
.tech-category ul {
    list-style: none;
}

.tech-category li {
    padding: 10px 0;
    border-bottom: 1px solid #eee;
    display: flex;
    align-items: center;
    gap: 15px;
}

.tech-category li:last-child {
    border-bottom: none;
}

.tech-category li i {
    color: #667eea;
    width: 20px;
}

/* Project Structure */
.project-structure {
    background: rgba(255, 255, 255, 0.95);
    padding: 40px;
    border-radius: 15px;
    margin-bottom: 60px;
    backdrop-filter: blur(10px);
}

.project-structure h2 {
    text-align: center;
    margin-bottom: 40px;
    color: #333;
}

.structure-tree {
    font-family: 'Courier New', monospace;
    background: #f8f9fa;
    padding: 30px;
    border-radius: 10px;
    border-left: 4px solid #667eea;
}

.tree-item {
    margin: 10px 0;
    display: flex;
    align-items: center;
    gap: 10px;
}

.tree-children {
    margin-left: 30px;
    border-left: 2px solid #ddd;
    padding-left: 20px;
}

.tree-desc {
    color: #666;
    font-style: italic;
    margin-left: auto;
}

/* Quick Links */
.quick-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    padding: 30px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    text-decoration: none;
    color: #333;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.quick-link:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
    color: #667eea;
}

.quick-link i {
    font-size: 2rem;
    color: #667eea;
}

.quick-link span {
    font-weight: 600;
}

/* Sections */
section {
    margin-bottom: 60px;
}

section h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 40px;
    color: white;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

/* Architecture Specific Styles */
.architecture-diagram {
    background: rgba(255, 255, 255, 0.95);
    padding: 40px;
    border-radius: 15px;
    margin-bottom: 40px;
    text-align: center;
    backdrop-filter: blur(10px);
}

.diagram-container {
    display: flex;
    justify-content: space-around;
    align-items: center;
    flex-wrap: wrap;
    gap: 30px;
    margin: 40px 0;
}

.diagram-box {
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    padding: 30px;
    border-radius: 15px;
    min-width: 200px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.diagram-arrow {
    font-size: 2rem;
    color: #667eea;
}

/* Code Blocks */
.code-block {
    background: #2d3748;
    color: #e2e8f0;
    padding: 20px;
    border-radius: 10px;
    font-family: 'Courier New', monospace;
    overflow-x: auto;
    margin: 20px 0;
}

/* Feature Lists */
.feature-list {
    display: grid;
    gap: 20px;
    margin: 30px 0;
}

.feature-item {
    background: rgba(255, 255, 255, 0.95);
    padding: 25px;
    border-radius: 10px;
    border-left: 4px solid #667eea;
    backdrop-filter: blur(10px);
}

.feature-item h4 {
    color: #667eea;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.feature-item p {
    color: #666;
    line-height: 1.6;
}

/* Footer */
.footer {
    background: rgba(0, 0, 0, 0.8);
    color: white;
    text-align: center;
    padding: 40px 20px;
    margin-top: 80px;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-links {
    margin-top: 20px;
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: #667eea;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        flex-direction: column;
        gap: 10px;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .diagram-container {
        flex-direction: column;
    }
    
    .diagram-arrow {
        transform: rotate(90deg);
    }
    
    .main-content {
        padding: 20px 10px;
    }
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.6s ease-in;
}

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

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

.mb-4 {
    margin-bottom: 2rem;
}

.mt-4 {
    margin-top: 2rem;
}

.highlight {
    background: linear-gradient(120deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: bold;
}