/**
 * Minimal, monochrome design system
 * Production-ready stylesheet
 */

:root {
    --color-black: #000000;
    --color-white: #ffffff;
    --color-gray-50: #fafafa;
    --color-gray-100: #f5f5f5;
    --color-gray-200: #e5e5e5;
    --color-gray-300: #d4d4d4;
    --color-gray-400: #a3a3a3;
    --color-gray-500: #737373;
    --color-gray-600: #525252;
    --color-gray-700: #404040;
    --color-gray-800: #262626;
    --color-gray-900: #171717;
    
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    
    --max-width: 1200px;
    --content-width: 700px;
    --spacing-unit: 1rem;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    line-height: 1.6;
    color: var(--color-gray-900);
    background: var(--color-white);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-unit);
    color: var(--color-black);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: var(--spacing-unit);
}

a {
    color: var(--color-black);
    text-decoration: none;
    transition: opacity 0.2s;
}

a:hover {
    opacity: 0.7;
}

/* Layout */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header */
.site-header {
    border-bottom: 1px solid var(--color-gray-200);
    background: var(--color-white);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 1.25rem;
    font-weight: 600;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    font-size: 0.95rem;
}

/* Hero */
.hero {
    padding: 6rem 0;
    text-align: center;
    background: linear-gradient(135deg, var(--color-gray-50) 0%, var(--color-white) 100%);
    animation: gradientShift 20s ease infinite;
    background-size: 200% 200%;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 2rem;
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: 1rem;
}

.hero-tagline {
    font-size: 1.5rem;
    color: var(--color-gray-600);
    margin-bottom: 1.5rem;
    font-weight: 400;
}

.hero-intro {
    font-size: 1.125rem;
    color: var(--color-gray-700);
    max-width: 600px;
    margin: 0 auto;
}

/* Sections */
.section-title {
    font-size: 2rem;
    margin-bottom: 2rem;
    text-align: center;
}

.categories-section {
    padding: 4rem 0;
}

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

.category-card {
    padding: 2rem;
    border: 1px solid var(--color-gray-200);
    border-radius: 4px;
    transition: all 0.3s ease;
    background: var(--color-white);
}

.category-card:hover {
    border-color: var(--color-gray-400);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.category-card h3 {
    margin-bottom: 0.5rem;
}

.category-card p {
    color: var(--color-gray-600);
    font-size: 0.95rem;
    margin: 0;
}

/* Posts */
.recent-posts {
    padding: 4rem 0;
    background: var(--color-gray-50);
}

.posts-list {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.post-card {
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: 4px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.post-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transform: translateY(-2px);
}

.post-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
    background: var(--color-gray-100);
}

.post-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.post-content {
    padding: 1.5rem;
}

.post-category {
    display: inline-block;
    font-size: 0.875rem;
    color: var(--color-gray-600);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.5rem;
}

.post-title {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
}

.post-title a {
    color: var(--color-black);
}

.post-excerpt {
    color: var(--color-gray-700);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.post-date {
    font-size: 0.875rem;
    color: var(--color-gray-500);
}

.section-footer {
    text-align: center;
    margin-top: 3rem;
}

.btn-link {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: 1px solid var(--color-black);
    border-radius: 4px;
    font-weight: 500;
    transition: all 0.2s;
}

.btn-link:hover {
    background: var(--color-black);
    color: var(--color-white);
    opacity: 1;
}

/* Blog Page */
.blog-page {
    padding: 3rem 0;
}

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

.page-title {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.page-subtitle {
    font-size: 1.125rem;
    color: var(--color-gray-600);
    max-width: 600px;
    margin: 0 auto;
}

.blog-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 3rem;
    margin-top: 3rem;
}

.blog-main {
    min-width: 0;
}

.blog-sidebar {
    border-left: 1px solid var(--color-gray-200);
    padding-left: 2rem;
}

.sidebar-section h3 {
    font-size: 1.125rem;
    margin-bottom: 1rem;
}

.category-list {
    list-style: none;
}

.category-list li {
    margin-bottom: 0.5rem;
}

.category-list a {
    color: var(--color-gray-700);
    font-size: 0.95rem;
}

/* Blog Post */
.blog-post {
    padding: 3rem 0;
}

.post-header {
    margin-bottom: 2rem;
    text-align: center;
}

.post-header .post-title {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.post-meta {
    color: var(--color-gray-600);
    font-size: 0.95rem;
}

.post-featured-image {
    margin: 2rem 0;
    text-align: center;
}

.post-featured-image img {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
}

.post-content {
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.post-content h2,
.post-content h3,
.post-content h4 {
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.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: var(--color-gray-100);
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-size: 0.9em;
    font-family: 'Courier New', monospace;
}

.post-content pre {
    background: var(--color-gray-900);
    color: var(--color-white);
    padding: 1.5rem;
    border-radius: 4px;
    overflow-x: auto;
    margin-bottom: 1.5rem;
}

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

.post-content blockquote {
    border-left: 4px solid var(--color-gray-300);
    padding-left: 1.5rem;
    margin: 1.5rem 0;
    color: var(--color-gray-700);
    font-style: italic;
}

.post-content a {
    color: var(--color-gray-900);
    text-decoration: underline;
}

.post-footer {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-gray-200);
}

.post-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: center;
}

.post-tags .tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--color-gray-100);
    border-radius: 3px;
    font-size: 0.875rem;
    color: var(--color-gray-700);
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    margin-top: 3rem;
    padding: 2rem 0;
}

.pagination-link {
    padding: 0.5rem 1rem;
    border: 1px solid var(--color-gray-300);
    border-radius: 4px;
}

.pagination-info {
    color: var(--color-gray-600);
}

/* About Page */
.about-page {
    padding: 4rem 0;
}

.about-content {
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.about-text .lead {
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: 2rem;
    color: var(--color-black);
}

.about-text p {
    margin-bottom: 1.5rem;
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--color-gray-800);
}

/* Contact Page */
.contact-page {
    padding: 4rem 0;
}

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

.contact-form-wrapper {
    max-width: 600px;
    margin: 0 auto;
    padding: 0 2rem;
}

.contact-form {
    background: var(--color-white);
    padding: 2rem;
    border: 1px solid var(--color-gray-200);
    border-radius: 4px;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--color-gray-900);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--color-gray-300);
    border-radius: 4px;
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-gray-600);
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}

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

.btn-primary:hover {
    background: var(--color-gray-800);
    opacity: 1;
}

.alert {
    padding: 1rem;
    border-radius: 4px;
    margin-bottom: 1.5rem;
}

.alert-success {
    background: var(--color-gray-100);
    border: 1px solid var(--color-gray-300);
    color: var(--color-gray-900);
}

.alert-error {
    background: var(--color-gray-100);
    border: 1px solid var(--color-gray-400);
    color: var(--color-gray-900);
}

/* LinkedIn Page */
.linkedin-page {
    padding: 3rem 0;
}

.linkedin-embeds {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 2rem;
}

.linkedin-embed-wrapper {
    margin-bottom: 3rem;
    padding: 2rem;
    border: 1px solid var(--color-gray-200);
    border-radius: 4px;
    background: var(--color-white);
}

.embed-title {
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.embed-container {
    min-height: 200px;
}

/* Footer */
.site-footer {
    margin-top: 6rem;
    padding: 3rem 0;
    border-top: 1px solid var(--color-gray-200);
    background: var(--color-gray-50);
}

.footer-container {
    text-align: center;
    color: var(--color-gray-600);
    font-size: 0.95rem;
}

/* Error Page */
.error-page {
    min-height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.error-page h1 {
    font-size: 6rem;
    margin-bottom: 1rem;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-menu {
        gap: 1rem;
        font-size: 0.9rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-tagline {
        font-size: 1.25rem;
    }
    
    .blog-layout {
        grid-template-columns: 1fr;
    }
    
    .blog-sidebar {
        border-left: none;
        border-top: 1px solid var(--color-gray-200);
        padding-left: 0;
        padding-top: 2rem;
    }
    
    .page-title {
        font-size: 2rem;
    }
    
    .post-header .post-title {
        font-size: 2rem;
    }
    
    .categories-grid {
        grid-template-columns: 1fr;
    }
}

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

.post-card,
.category-card {
    animation: fadeIn 0.6s ease-out;
}