/* =========================================
   Data Feed - Main Stylesheet
   A modern, responsive, SEO-optimized blog
   ========================================= */

/* CSS Variables - Design System */
:root {
    /* Colors - Warm Midnight Theme */
    --color-bg: #0d0d0f;
    --color-bg-elevated: #141418;
    --color-bg-card: #1a1a1f;
    --color-bg-hover: #222228;
    
    --color-text-primary: #f5f5f7;
    --color-text-secondary: #a1a1a6;
    --color-text-muted: #6e6e73;
    
    --color-accent: #ff6b35;
    --color-accent-soft: rgba(255, 107, 53, 0.15);
    --color-accent-hover: #ff8555;
    
    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-light: rgba(255, 255, 255, 0.04);
    
    /* Category Colors */
    --color-ai: #a78bfa;        /* Technology/AI - Purple */
    --color-quantum: #60a5fa;   /* Quantum - Blue */
    --color-green: #4ade80;     /* Sustainability - Green */
    --color-robotics: #f472b6;  /* Robotics - Pink */
    --color-connectivity: #fbbf24; /* Connectivity - Amber */
    --color-security: #ef4444;  /* Cybersecurity - Red */
    --color-spatial: #2dd4bf;   /* Spatial - Teal */
    --color-startups: #fb923c;  /* Startups - Orange */
    
    /* New Category Colors */
    --color-news: #38bdf8;      /* World News - Sky Blue */
    --color-sports: #f87171;    /* Sports - Red/Rose */
    --color-politics: #818cf8;  /* Politics - Indigo */
    --color-finance: #34d399;   /* Finance - Emerald */
    --color-science: #22d3ee;   /* Science - Cyan */
    
    /* Typography */
    --font-display: 'Instrument Serif', Georgia, serif;
    --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(255, 107, 53, 0.2);
    
    /* Container */
    --container-max: 1200px;
    --container-padding: 1.5rem;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg);
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 400;
    line-height: 1.2;
    color: var(--color-text-primary);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(1.75rem, 3vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.5rem); }

p {
    color: var(--color-text-secondary);
    max-width: 65ch;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Container */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* =========================================
   Header & Navigation
   ========================================= */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(13, 13, 15, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    transition: box-shadow var(--transition-base);
}

.site-header.scrolled {
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--color-text-primary);
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    color: var(--color-accent);
    flex-shrink: 0;
}

.logo-icon svg {
    width: 100%;
    height: 100%;
    display: block;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
}

.nav-links a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    padding: var(--spacing-sm) 0;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width var(--transition-base);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--color-text-primary);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 28px;
    height: 28px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
}

.mobile-menu-btn span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--color-text-primary);
    border-radius: 2px;
    transition: var(--transition-fast);
}

/* =========================================
   Hero Section
   ========================================= */
.hero {
    position: relative;
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-4xl) var(--container-padding);
    padding-top: calc(72px + var(--spacing-4xl));
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(255, 107, 53, 0.15), transparent),
        radial-gradient(ellipse 60% 40% at 80% 60%, rgba(167, 139, 250, 0.1), transparent),
        radial-gradient(ellipse 50% 30% at 20% 80%, rgba(96, 165, 250, 0.08), transparent);
    z-index: -1;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    animation: fadeInUp 0.8s ease-out;
}

.hero-tagline {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-accent);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-accent-soft);
    border-radius: var(--radius-full);
}

.hero h1 {
    margin-bottom: var(--spacing-lg);
}

.hero h1 em {
    font-style: italic;
    background: linear-gradient(135deg, var(--color-accent), var(--color-ai));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.15rem;
    max-width: 600px;
    margin: 0 auto var(--spacing-2xl);
    color: var(--color-text-secondary);
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-bg);
    background: var(--color-accent);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

.cta-button:hover {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

/* =========================================
   Section Styles
   ========================================= */
section {
    padding: var(--spacing-4xl) 0;
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--spacing-3xl);
}

.section-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
}

.section-header h2 {
    margin-bottom: var(--spacing-md);
}

.section-header p {
    margin: 0 auto;
    color: var(--color-text-muted);
}

/* =========================================
   Categories Grid
   ========================================= */
.categories-section {
    background: var(--color-bg-elevated);
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    align-items: stretch;
}

.category-card {
    position: relative;
    padding: var(--spacing-xl);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    min-height: 280px;
    height: 100%;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--color-accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

.category-card:hover {
    background: var(--color-bg-hover);
    border-color: var(--color-border);
    transform: translateY(-4px);
}

.category-card:hover::before {
    transform: scaleX(1);
}

.category-card[data-category="ai"] .category-icon { color: var(--color-ai); }
.category-card[data-category="quantum"] .category-icon { color: var(--color-quantum); }
.category-card[data-category="sustainability"] .category-icon { color: var(--color-green); }
.category-card[data-category="robotics"] .category-icon { color: var(--color-robotics); }
.category-card[data-category="connectivity"] .category-icon { color: var(--color-connectivity); }
.category-card[data-category="cybersecurity"] .category-icon { color: var(--color-security); }
.category-card[data-category="spatial"] .category-icon { color: var(--color-spatial); }
.category-card[data-category="startups"] .category-icon { color: var(--color-startups); }

/* Main Category Mappings */
.category-card[data-category="news"] .category-icon { color: var(--color-news); }
.category-card[data-category="sports"] .category-icon { color: var(--color-sports); }
.category-card[data-category="politics"] .category-icon { color: var(--color-politics); }
.category-card[data-category="finance"] .category-icon { color: var(--color-finance); }
.category-card[data-category="science"] .category-icon { color: var(--color-science); }

.category-card[data-category="ai"]::before { background: var(--color-ai); }
.category-card[data-category="quantum"]::before { background: var(--color-quantum); }
.category-card[data-category="sustainability"]::before { background: var(--color-green); }
.category-card[data-category="robotics"]::before { background: var(--color-robotics); }
.category-card[data-category="connectivity"]::before { background: var(--color-connectivity); }
.category-card[data-category="cybersecurity"]::before { background: var(--color-security); }
.category-card[data-category="spatial"]::before { background: var(--color-spatial); }
.category-card[data-category="startups"]::before { background: var(--color-startups); }

/* Main Category Hover Lines */
.category-card[data-category="news"]::before { background: var(--color-news); }
.category-card[data-category="sports"]::before { background: var(--color-sports); }
.category-card[data-category="politics"]::before { background: var(--color-politics); }
.category-card[data-category="finance"]::before { background: var(--color-finance); }
.category-card[data-category="science"]::before { background: var(--color-science); }

.category-icon {
    width: 48px;
    height: 48px;
    margin-bottom: var(--spacing-md);
}

.category-icon svg {
    width: 100%;
    height: 100%;
}

.category-card h3 {
    font-family: var(--font-body);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.category-card p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
    flex-grow: 1;
}

.category-count {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-top: auto;
    padding-top: var(--spacing-sm);
}

/* =========================================
   Featured Post
   ========================================= */
.featured-post {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    overflow: hidden;
}

.featured-image {
    aspect-ratio: 4/3;
    background: var(--color-bg-card);
    overflow: hidden;
}

.featured-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    transition: transform var(--transition-slow);
}

.featured-post:hover .featured-image img {
    transform: scale(1.05);
}

.featured-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: 
        radial-gradient(ellipse at 30% 40%, rgba(255, 107, 53, 0.2), transparent 50%),
        radial-gradient(ellipse at 70% 60%, rgba(96, 165, 250, 0.15), transparent 50%),
        linear-gradient(135deg, var(--color-bg-elevated), var(--color-bg-card));
}

.featured-placeholder svg {
    width: 120px;
    height: 120px;
    color: var(--color-quantum);
    opacity: 0.6;
    animation: rotate 30s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.featured-content {
    padding: var(--spacing-2xl);
}

.post-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    font-size: 0.8rem;
}

.post-category {
    color: var(--color-accent);
    font-weight: 600;
}

.post-date,
.read-time {
    color: var(--color-text-muted);
}

.featured-content h3 {
    font-size: clamp(1.5rem, 2.5vw, 2rem);
    margin-bottom: var(--spacing-md);
    line-height: 1.3;
}

.featured-content h3 a:hover {
    color: var(--color-accent);
}

.featured-content p {
    font-size: 1rem;
    margin-bottom: var(--spacing-lg);
}

.read-more {
    display: inline-flex;
    align-items: center;
    font-weight: 600;
    color: var(--color-accent);
}

.read-more:hover {
    color: var(--color-accent-hover);
}

/* =========================================
   Posts Grid
   ========================================= */
.posts-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.post-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-base);
}

.post-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-border);
    box-shadow: var(--shadow-md);
}

.post-image {
    aspect-ratio: 16/10;
    overflow: hidden;
    background: var(--color-bg-card);
}

.post-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    transition: transform var(--transition-slow);
}

.post-card:hover .post-image img {
    transform: scale(1.05);
}

.post-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.post-placeholder.ai {
    background: linear-gradient(135deg, rgba(167, 139, 250, 0.2), rgba(167, 139, 250, 0.05));
}

.post-placeholder.ai svg {
    color: var(--color-ai);
}

.post-placeholder.quantum {
    background: linear-gradient(135deg, rgba(96, 165, 250, 0.2), rgba(96, 165, 250, 0.05));
}

.post-placeholder.quantum svg {
    color: var(--color-quantum);
}

.post-placeholder.green {
    background: linear-gradient(135deg, rgba(74, 222, 128, 0.2), rgba(74, 222, 128, 0.05));
}

.post-placeholder.green svg {
    color: var(--color-green);
}

.post-placeholder.cybersecurity {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.2), rgba(239, 68, 68, 0.05));
}

.post-placeholder.cybersecurity svg {
    color: #ef4444;
}

.post-placeholder svg {
    width: 48px;
    height: 48px;
    opacity: 0.8;
}

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

.post-card .post-meta {
    font-size: 0.75rem;
    margin-bottom: var(--spacing-sm);
}

.post-card h3 {
    font-family: var(--font-body);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.post-card h3 a:hover {
    color: var(--color-accent);
}

.post-card p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* =========================================
   Newsletter Section
   ========================================= */
.newsletter-section {
    background: var(--color-bg-elevated);
    position: relative;
    overflow: hidden;
}

.newsletter-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -10%;
    width: 50%;
    height: 200%;
    background: radial-gradient(ellipse, rgba(255, 107, 53, 0.08), transparent 70%);
    pointer-events: none;
}

.newsletter-content {
    text-align: center;
    max-width: 500px;
    margin: 0 auto;
    position: relative;
}

.newsletter-content h2 {
    margin-bottom: var(--spacing-md);
}

.newsletter-content > p {
    margin: 0 auto var(--spacing-xl);
    color: var(--color-text-muted);
}

.newsletter-form {
    display: flex;
    gap: var(--spacing-sm);
    max-width: 400px;
    margin: 0 auto var(--spacing-md);
}

.newsletter-form input {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1rem;
    font-family: var(--font-body);
    color: var(--color-text-primary);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    outline: none;
    transition: border-color var(--transition-fast);
}

.newsletter-form input:focus {
    border-color: var(--color-accent);
}

.newsletter-form input::placeholder {
    color: var(--color-text-muted);
}

.newsletter-form button {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
    font-weight: 600;
    font-family: var(--font-body);
    color: var(--color-bg);
    background: var(--color-accent);
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.newsletter-form button:hover {
    background: var(--color-accent-hover);
}

.newsletter-note {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* =========================================
   About Section
   ========================================= */
.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-text {
    text-align: center;
}

.about-text h2 {
    margin-bottom: var(--spacing-lg);
}

.about-text p {
    margin: 0 auto var(--spacing-md);
    max-width: 600px;
}

.about-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-3xl);
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-2xl);
    border-top: 1px solid var(--color-border);
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-family: var(--font-display);
    font-size: 2.5rem;
    color: var(--color-accent);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* =========================================
   Footer
   ========================================= */
.site-footer {
    background: var(--color-bg-elevated);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-4xl) 0 var(--spacing-xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-3xl);
    align-items: start;
}

.footer-brand .logo {
    margin-bottom: var(--spacing-md);
}

.footer-brand p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.6;
    margin-bottom: var(--spacing-sm);
}

.footer-brand p:last-of-type {
    margin-bottom: 0;
}

.footer-links h4 {
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.footer-links ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links li:last-child {
    margin-bottom: 0;
}

.footer-links a {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.footer-links a:hover {
    color: var(--color-accent);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
    margin-top: var(--spacing-xl);
}

.footer-bottom p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin: 0;
    line-height: 1.6;
}

/* =========================================
   Animations
   ========================================= */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Scroll animation classes */
.animate-ready {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.animate-in {
    opacity: 1 !important;
    transform: translateY(0) !important;
}

/* Reading Progress (blog posts) */
.reading-progress {
    position: fixed;
    top: 72px;
    left: 0;
    width: 100%;
    height: 3px;
    background: rgba(255, 255, 255, 0.1);
    z-index: 999;
}

.reading-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--color-accent), var(--color-ai));
    width: 0%;
    transition: width 0.1s ease;
}

/* =========================================
   Responsive Design
   ========================================= */
@media (max-width: 1024px) {
    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-lg);
    }
    
    .category-card {
        min-height: 260px;
    }
    
    .featured-post {
        grid-template-columns: 1fr;
    }
    
    .featured-image {
        aspect-ratio: 16/9;
    }
    
    .posts-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-2xl);
    }
    
    .footer-brand {
        grid-column: 1 / -1;
        margin-bottom: var(--spacing-lg);
    }
    
    .footer-links {
        margin-bottom: var(--spacing-lg);
    }
}

@media (max-width: 768px) {
    :root {
        --container-padding: 1rem;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: rgba(13, 13, 15, 0.98);
        backdrop-filter: blur(20px);
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }
    
    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .hero {
        min-height: 80vh;
        padding-top: calc(72px + var(--spacing-3xl));
    }
    
    .categories-grid {
        grid-template-columns: 1fr;
    }
    
    .category-card {
        padding: var(--spacing-lg);
    }
    
    .posts-grid {
        grid-template-columns: 1fr;
    }
    
    .newsletter-form {
        flex-direction: column;
    }
    
    .about-stats {
        flex-direction: column;
        gap: var(--spacing-xl);
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-brand p {
        margin: 0 auto;
    }
}

@media (max-width: 480px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }
    
    .hero-tagline {
        font-size: 0.75rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .featured-content {
        padding: var(--spacing-lg);
    }
}

/* =========================================
   Blog Post Page Styles
   ========================================= */
.blog-post-page .site-header {
    background: rgba(13, 13, 15, 0.95);
}

.blog-hero {
    padding-top: calc(72px + var(--spacing-3xl));
    padding-bottom: var(--spacing-3xl);
    background: var(--color-bg-elevated);
    border-bottom: 1px solid var(--color-border);
    position: relative;
}

.blog-hero-image {
    width: 100%;
    height: 400px;
    margin-bottom: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--color-bg-card);
}

.blog-hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

.blog-hero .container {
    max-width: 900px;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.85rem;
    margin-bottom: var(--spacing-lg);
}

.breadcrumb a {
    color: var(--color-text-muted);
}

.breadcrumb a:hover {
    color: var(--color-accent);
}

.breadcrumb span {
    color: var(--color-text-muted);
}

.blog-hero .post-meta {
    margin-bottom: var(--spacing-lg);
}

.blog-hero h1 {
    font-size: clamp(2rem, 4vw, 3rem);
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
}

.blog-excerpt {
    font-size: 1.2rem;
    color: var(--color-text-secondary);
    max-width: 700px;
}

.author-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

.author-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-accent), var(--color-ai));
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--color-bg);
}

.author-details {
    display: flex;
    flex-direction: column;
}

.author-name {
    font-weight: 600;
    color: var(--color-text-primary);
}

.author-role {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* Article Content */
.article-content {
    padding: var(--spacing-3xl) 0;
}

.article-content .container {
    max-width: 800px;
}

.article-body {
    font-size: 1.1rem;
    line-height: 1.8;
}

.article-body h2 {
    margin-top: var(--spacing-3xl);
    margin-bottom: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.article-body h3 {
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.article-body p {
    margin-bottom: var(--spacing-lg);
    max-width: none;
}

.article-body ul,
.article-body ol {
    margin-bottom: var(--spacing-lg);
    padding-left: var(--spacing-xl);
}

.article-body li {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-secondary);
}

.article-body strong {
    color: var(--color-text-primary);
    font-weight: 600;
}

.article-body blockquote {
    margin: var(--spacing-2xl) 0;
    padding: var(--spacing-lg) var(--spacing-xl);
    border-left: 4px solid var(--color-accent);
    background: var(--color-bg-elevated);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.article-body blockquote p {
    font-size: 1.15rem;
    font-style: italic;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.article-body blockquote cite {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    font-style: normal;
}

/* Key Takeaway Box */
.key-takeaway {
    margin: var(--spacing-2xl) 0;
    padding: var(--spacing-xl);
    background: var(--color-accent-soft);
    border: 1px solid rgba(255, 107, 53, 0.3);
    border-radius: var(--radius-lg);
}

.key-takeaway h4 {
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
}

.key-takeaway ul {
    margin: 0;
    padding-left: var(--spacing-lg);
}

.key-takeaway li {
    color: var(--color-text-primary);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin: var(--spacing-2xl) 0;
}

.stat-card {
    padding: var(--spacing-lg);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    text-align: center;
}

.stat-card .stat-number {
    font-size: 2rem;
    margin-bottom: var(--spacing-xs);
}

.stat-card .stat-label {
    font-size: 0.85rem;
}

@media (max-width: 768px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

/* Article Tags */
.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-3xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

.article-tags span {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-muted);
    margin-right: var(--spacing-sm);
}

.tag {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.tag:hover {
    background: var(--color-bg-hover);
    color: var(--color-text-primary);
}

/* Related Posts */
.related-posts {
    background: var(--color-bg-elevated);
}

.related-posts .posts-grid {
    grid-template-columns: repeat(2, 1fr);
}

@media (max-width: 768px) {
    .related-posts .posts-grid {
        grid-template-columns: 1fr;
    }
}