/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: #fff;
    border-bottom: 1px solid #e5e7eb;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    font-size: 1.5rem;
    font-weight: 700;
    color: #1f2937;
    text-decoration: none;
    transition: color 0.2s;
}

.logo a:hover {
    color: #3b82f6;
}

.nav {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: #6b7280;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: #3b82f6;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -1rem;
    left: 0;
    right: 0;
    height: 2px;
    background: #3b82f6;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 4rem 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    margin: 2rem 0;
    border-radius: 12px;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    opacity: 0.9;
    max-width: 800px;
    margin: 0 auto;
}

/* Blog Grid */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    padding: 2rem 0;
}

.blog-card {
    background: #fff;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.blog-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    border-color: #3b82f6;
}

.blog-card.featured {
    grid-column: 1 / -1;
    background: linear-gradient(135deg, #f8fafc 0%, #e0e7ff 100%);
    border: 2px solid #3b82f6;
}

.blog-card.featured .blog-title {
    font-size: 1.5rem;
}

.blog-content {
    padding: 1.5rem;
}

.blog-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.blog-part {
    background: #3b82f6;
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-weight: 500;
}

.blog-date {
    color: #6b7280;
    font-weight: 500;
}

.blog-title {
    margin-bottom: 1rem;
}

.blog-title a {
    color: #1f2937;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.25rem;
    line-height: 1.3;
    transition: color 0.2s;
}

.blog-title a:hover {
    color: #3b82f6;
}

.blog-excerpt {
    color: #6b7280;
    margin-bottom: 1rem;
    line-height: 1.5;
}

.read-more {
    color: #3b82f6;
    text-decoration: none;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    transition: color 0.2s;
}

.read-more:hover {
    color: #2563eb;
}

/* Footer */
.footer {
    background: #1f2937;
    color: white;
    padding: 3rem 0 1.5rem;
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    color: #f9fafb;
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    border-bottom: 2px solid #3b82f6;
    padding-bottom: 0.5rem;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: #d1d5db;
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
    display: inline-block;
}

.footer-links a:hover {
    color: #3b82f6;
    transform: translateX(2px);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #374151;
    margin-top: 2rem;
}

.footer-bottom p {
    color: #9ca3af;
    font-size: 0.9rem;
}

/* Blog Post Styles */
.blog-post {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 0;
}

.post-header {
    margin-bottom: 3rem;
    text-align: center;
}

.post-meta {
    margin-bottom: 1rem;
}

.post-part {
    background: #3b82f6;
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 25px;
    font-weight: 500;
    font-size: 0.875rem;
    display: inline-block;
}

.post-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1f2937;
    line-height: 1.2;
    margin-bottom: 1rem;
}

.post-content {
    font-size: 1.1rem;
    line-height: 1.7;
    color: #374151;
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4,
.post-content h5,
.post-content h6 {
    color: #1f2937;
    font-weight: 600;
    margin: 2rem 0 1rem 0;
    line-height: 1.3;
}

.post-content h1 { font-size: 2rem; }
.post-content h2 { font-size: 1.75rem; }
.post-content h3 { font-size: 1.5rem; }
.post-content h4 { font-size: 1.25rem; }

.post-content p {
    margin-bottom: 1.5rem;
}

.post-content ul,
.post-content ol {
    margin-bottom: 1.5rem;
    padding-left: 2rem;
}

.post-content li {
    margin-bottom: 0.5rem;
}

.post-content code {
    background: #f3f4f6;
    color: #1f2937;
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.9em;
}

.post-content pre {
    background: #1f2937;
    color: #f9fafb;
    padding: 1.5rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1.5rem 0;
}

.post-content pre code {
    background: none;
    padding: 0;
    color: inherit;
}

.post-content blockquote {
    border-left: 4px solid #3b82f6;
    padding-left: 1.5rem;
    margin: 1.5rem 0;
    color: #6b7280;
    font-style: italic;
}

.post-content hr {
    border: none;
    height: 2px;
    background: #e5e7eb;
    margin: 3rem 0;
}

.post-navigation {
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid #e5e7eb;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-next,
.nav-prev {
    flex: 1;
}

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

.nav-next a,
.nav-prev a {
    color: #1f2937;
    text-decoration: none;
    display: block;
    transition: color 0.2s;
}

.nav-next a:hover,
.nav-prev a:hover {
    color: #3b82f6;
}

.nav-label {
    font-size: 0.875rem;
    color: #6b7280;
    font-weight: 500;
    display: block;
    margin-bottom: 0.5rem;
}

.nav-title {
    font-weight: 600;
    font-size: 1.1rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .post-title {
        font-size: 2rem;
    }
    
    .post-content {
        font-size: 1rem;
    }
    
    .post-navigation {
        flex-direction: column;
        gap: 2rem;
    }
    
    .nav-next,
    .nav-prev {
        text-align: center;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .blog-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .blog-card.featured {
        grid-column: 1;
    }
    
    .header .container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav {
        gap: 1rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .footer-section h3 {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 3rem 1rem;
        margin: 1rem -15px;
        border-radius: 0;
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .blog-content {
        padding: 1rem;
    }
    
    .post-title {
        font-size: 1.75rem;
    }
    
    .blog-post {
        padding: 1rem 0;
    }
}