/* CSS Custom Properties */
:root {
    --primary-color: #1a1a1a;
    --secondary-color: #6b7280;
    --accent-color: #3b82f6;
    --background-color: #ffffff;
    --surface-color: #f9fafb;
    --border-color: #e5e7eb;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --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;
    
    --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: 0.5rem;
    --border-radius-lg: 0.75rem;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    
    --transition: all 0.2s ease-in-out;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background-color);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Landing Page Styles */
.landing {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--spacing-2xl) 0;
    position: relative;
}

/* Fixed Logo */
.logo-fixed {
    position: fixed;
    top: var(--spacing-xl);
    right: var(--spacing-xl);
    z-index: 100;
}

.logo-link {
    text-decoration: none;
    display: block;
}

.logo-rectangle {
    width: 60px;
    height: 40px;
    background-color: var(--primary-color);
    border-radius: var(--border-radius);
    display: flex;
    align-items: flex-end;
    justify-content: flex-end;
    padding: var(--spacing-sm);
    position: relative;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.logo-rectangle:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.logo-text {
    color: white;
    font-size: var(--font-size-sm);
    font-weight: 500;
    letter-spacing: 0.025em;
}

/* Hero Section */
.hero {
    margin-bottom: var(--spacing-3xl);
    text-align: center;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.hero-name {
    font-size: var(--font-size-4xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.2;
}

.hero-title {
    font-size: var(--font-size-xl);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    font-weight: 400;
}

.hero-description {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-2xl);
}

/* Contact Section */
.contact {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.contact h2 {
    font-size: var(--font-size-2xl);
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
}

.contact-links {
    display: flex;
    flex-direction: row;
    gap: var(--spacing-xl);
    align-items: center;
    justify-content: center;
}

.contact-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-primary);
    text-decoration: none;
    font-size: var(--font-size-lg);
    transition: var(--transition);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
}

.contact-link:hover {
    color: var(--accent-color);
    background-color: var(--surface-color);
    transform: translateY(-2px);
}

.contact-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

/* Blog CTA */
.blog-cta {
    text-align: center;
}

.blog-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.blog-link:hover {
    background-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.arrow-icon {
    width: 16px;
    height: 16px;
    transition: var(--transition);
}

.blog-link:hover .arrow-icon {
    transform: translateX(4px);
}

/* Blog Page Styles */
.blog-header {
    padding: var(--spacing-2xl) 0 var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
    margin-bottom: var(--spacing-2xl);
}

.blog-title {
    font-size: var(--font-size-4xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.blog-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-lg);
    transition: var(--transition);
}

.back-link:hover {
    color: var(--accent-color);
}

/* Filter Controls */
.filters {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background-color: var(--surface-color);
    border-radius: var(--border-radius-lg);
}

.filter-tag {
    background-color: white;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: var(--transition);
}

.filter-tag:hover,
.filter-tag.active {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

/* Filter tag specific colors */
.filter-tag[data-tag="web-development"]:hover,
.filter-tag[data-tag="web-development"].active { background-color: #3B82F6; border-color: #3B82F6; }
.filter-tag[data-tag="learning"]:hover,
.filter-tag[data-tag="learning"].active { background-color: #10B981; border-color: #10B981; }
.filter-tag[data-tag="bioinformatics"]:hover,
.filter-tag[data-tag="bioinformatics"].active { background-color: #059669; border-color: #059669; }
.filter-tag[data-tag="python"]:hover,
.filter-tag[data-tag="python"].active { background-color: #F59E0B; border-color: #F59E0B; }
.filter-tag[data-tag="research"]:hover,
.filter-tag[data-tag="research"].active { background-color: #8B5CF6; border-color: #8B5CF6; }
.filter-tag[data-tag="science"]:hover,
.filter-tag[data-tag="science"].active { background-color: #EF4444; border-color: #EF4444; }
.filter-tag[data-tag="personal"]:hover,
.filter-tag[data-tag="personal"].active { background-color: #6B7280; border-color: #6B7280; }
.filter-tag[data-tag="technology"]:hover,
.filter-tag[data-tag="technology"].active { background-color: #1F2937; border-color: #1F2937; }
.filter-tag[data-tag="tutorial"]:hover,
.filter-tag[data-tag="tutorial"].active { background-color: #DC2626; border-color: #DC2626; }
.filter-tag[data-tag="fastapi"]:hover,
.filter-tag[data-tag="fastapi"].active { background-color: #7C3AED; border-color: #7C3AED; }
.filter-tag[data-tag="htmx"]:hover,
.filter-tag[data-tag="htmx"].active { background-color: #0891B2; border-color: #0891B2; }
.filter-tag[data-tag="bootstrap"]:hover,
.filter-tag[data-tag="bootstrap"].active { background-color: #7C2D12; border-color: #7C2D12; }
.filter-tag[data-tag="angular"]:hover,
.filter-tag[data-tag="angular"].active { background-color: #EA580C; border-color: #EA580C; }
.filter-tag[data-tag="javascript"]:hover,
.filter-tag[data-tag="javascript"].active { background-color: #CA8A04; border-color: #CA8A04; }
.filter-tag[data-tag="microbiome"]:hover,
.filter-tag[data-tag="microbiome"].active { background-color: #16A34A; border-color: #16A34A; }
.filter-tag[data-tag="diversity"]:hover,
.filter-tag[data-tag="diversity"].active { background-color: #9333EA; border-color: #9333EA; }
.filter-tag[data-tag="abstractions"]:hover,
.filter-tag[data-tag="abstractions"].active { background-color: #BE185D; border-color: #BE185D; }
.filter-tag[data-tag="career"]:hover,
.filter-tag[data-tag="career"].active { background-color: #0F766E; border-color: #0F766E; }
.filter-tag[data-tag="decision-making"]:hover,
.filter-tag[data-tag="decision-making"].active { background-color: #B45309; border-color: #B45309; }
.filter-tag[data-tag="frameworks"]:hover,
.filter-tag[data-tag="frameworks"].active { background-color: #1E40AF; border-color: #1E40AF; }

/* Blog Grid */
.blog-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-3xl);
}

.blog-card {
    background-color: white;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
    text-decoration: none;
    color: inherit;
}

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

.card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background-color: var(--surface-color);
}

.card-color {
    width: 100%;
    height: 200px;
    background: var(--card-color, var(--accent-color));
    position: relative;
    overflow: hidden;
}

.card-color::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, transparent 0%, rgba(255,255,255,0.1) 100%);
}

.card-content {
    padding: var(--spacing-lg);
}

.card-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.card-category {
    background-color: var(--surface-color);
    color: var(--text-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-weight: 500;
}

.card-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.3;
}

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

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.card-tag {
    background-color: var(--surface-color);
    color: var(--text-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-xs);
    font-weight: 500;
}

/* Tag-specific colors */
.card-tag[data-tag="web-development"],
.post-tag[data-tag="web-development"] { background-color: #3B82F6; color: white; }
.card-tag[data-tag="learning"],
.post-tag[data-tag="learning"] { background-color: #10B981; color: white; }
.card-tag[data-tag="bioinformatics"],
.post-tag[data-tag="bioinformatics"] { background-color: #059669; color: white; }
.card-tag[data-tag="python"],
.post-tag[data-tag="python"] { background-color: #F59E0B; color: white; }
.card-tag[data-tag="research"],
.post-tag[data-tag="research"] { background-color: #8B5CF6; color: white; }
.card-tag[data-tag="science"],
.post-tag[data-tag="science"] { background-color: #EF4444; color: white; }
.card-tag[data-tag="personal"],
.post-tag[data-tag="personal"] { background-color: #6B7280; color: white; }
.card-tag[data-tag="technology"],
.post-tag[data-tag="technology"] { background-color: #1F2937; color: white; }
.card-tag[data-tag="tutorial"],
.post-tag[data-tag="tutorial"] { background-color: #DC2626; color: white; }
.card-tag[data-tag="fastapi"],
.post-tag[data-tag="fastapi"] { background-color: #7C3AED; color: white; }
.card-tag[data-tag="htmx"],
.post-tag[data-tag="htmx"] { background-color: #0891B2; color: white; }
.card-tag[data-tag="bootstrap"],
.post-tag[data-tag="bootstrap"] { background-color: #7C2D12; color: white; }
.card-tag[data-tag="angular"],
.post-tag[data-tag="angular"] { background-color: #EA580C; color: white; }
.card-tag[data-tag="javascript"],
.post-tag[data-tag="javascript"] { background-color: #CA8A04; color: white; }
.card-tag[data-tag="microbiome"],
.post-tag[data-tag="microbiome"] { background-color: #16A34A; color: white; }
.card-tag[data-tag="diversity"],
.post-tag[data-tag="diversity"] { background-color: #9333EA; color: white; }
.card-tag[data-tag="abstractions"],
.post-tag[data-tag="abstractions"] { background-color: #BE185D; color: white; }
.card-tag[data-tag="career"],
.post-tag[data-tag="career"] { background-color: #0F766E; color: white; }
.card-tag[data-tag="decision-making"],
.post-tag[data-tag="decision-making"] { background-color: #B45309; color: white; }
.card-tag[data-tag="frameworks"],
.post-tag[data-tag="frameworks"] { background-color: #1E40AF; color: white; }

/* Blog Post Styles */
.blog-post {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-2xl) 0;
}

.post-header {
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
}

.post-title {
    font-size: var(--font-size-4xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.post-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.post-category {
    background-color: var(--surface-color);
    color: var(--text-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-weight: 500;
}

.post-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.post-tag {
    background-color: var(--surface-color);
    color: var(--text-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-xs);
    font-weight: 500;
}

.post-content {
    font-size: var(--font-size-lg);
    line-height: 1.8;
    color: var(--text-primary);
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4,
.post-content h5,
.post-content h6 {
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
    color: var(--text-primary);
}

.post-content h1 { font-size: var(--font-size-3xl); }
.post-content h2 { font-size: var(--font-size-2xl); }
.post-content h3 { font-size: var(--font-size-xl); }

.post-content p {
    margin-bottom: var(--spacing-lg);
}

.post-content a {
    color: var(--accent-color);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

.post-content a:hover {
    border-bottom-color: var(--accent-color);
}

.post-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    margin: var(--spacing-xl) 0;
    box-shadow: var(--shadow-md);
}

.post-content code {
    background-color: var(--surface-color);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: var(--font-size-sm);
}

.post-content pre {
    background-color: var(--surface-color);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    overflow-x: auto;
    margin: var(--spacing-lg) 0;
}

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

.post-content blockquote {
    border-left: 4px solid var(--accent-color);
    padding-left: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
    font-style: italic;
    color: var(--text-secondary);
}

.post-content ul,
.post-content ol {
    margin: var(--spacing-lg) 0;
    padding-left: var(--spacing-xl);
}

.post-content li {
    margin-bottom: var(--spacing-sm);
}

/* Navigation */
.post-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--spacing-3xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--border-color);
}

.nav-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--accent-color);
}

.nav-link.prev {
    flex-direction: row-reverse;
}

/* Responsive Design */
@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-xl);
    }
    
    .hero-name {
        font-size: 3.5rem;
    }
    
    .contact-links {
        flex-direction: row;
        gap: var(--spacing-xl);
        justify-content: center;
    }
    
    .blog-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .filters {
        justify-content: center;
    }
    
    .contact-links {
        flex-direction: row;
        gap: var(--spacing-xl);
    }
}

@media (min-width: 1024px) {
    .blog-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .hero-name {
        font-size: 4rem;
    }
}

@media (max-width: 767px) {
    .logo-fixed {
        top: var(--spacing-md);
        right: var(--spacing-md);
    }
    
    .logo-rectangle {
        width: 50px;
        height: 35px;
    }
    
    .logo-text {
        font-size: var(--font-size-xs);
    }
    
    .contact-links {
        flex-direction: column;
        gap: var(--spacing-md);
    }
}

/* Loading Animation */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-3xl);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.fade-in {
    animation: fadeIn 0.5s ease-in-out;
}

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