/* CSS Variables */
:root {
    /* Colors */
    --color-teal-primary: #14B8A6;
    --color-teal-dark: #0D9488;
    --color-teal-light: #5EEAD4;
    --color-teal-extra-light: #CCFBF1;
    --color-navy: #1E293B;
    --color-slate: #334155;
    --color-gray-50: #F9FAFB;
    --color-gray-100: #F3F4F6;
    --color-gray-200: #E5E7EB;
    --color-gray-300: #D1D5DB;
    --color-gray-600: #4B5563;
    --color-gray-700: #374151;
    --color-gray-900: #111827;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-base: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;
    --spacing-4xl: 80px;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 20px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-teal: 0 4px 14px rgba(20, 184, 166, 0.25);
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: var(--font-primary);
    color: var(--color-slate);
    background-color: var(--color-gray-50);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Navigation Styles */
.blog-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--color-gray-200);
    transition: all var(--transition-base);
}

.blog-nav.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-link {
    position: relative;
    font-size: 15px;
    font-weight: 500;
    color: var(--color-slate);
    text-decoration: none;
    padding: 8px 0;
    transition: color var(--transition-base);
}

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

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

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

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, #CCFBF1 0%, #E0F2FE 50%, #FEF3C7 100%);
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(20, 184, 166, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(-30px, -30px) scale(1.1); }
}

.hero-title {
    font-size: 42px;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--color-navy);
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.6s ease-out;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--color-gray-600);
    line-height: 1.6;
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
    animation: fadeInUp 0.6s ease-out 0.1s backwards;
}

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

/* Search Bar */
.search-wrapper {
    position: relative;
    max-width: 550px;
    margin: 0 auto;
    animation: fadeInUp 0.6s ease-out 0.2s backwards;
}

.search-input {
    width: 100%;
    padding: 14px 52px 14px 18px;
    font-size: 15px;
    border: 2px solid transparent;
    border-radius: var(--radius-lg);
    background-color: white;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-base);
    font-family: var(--font-primary);
}

.search-input:focus {
    outline: none;
    border-color: var(--color-teal-primary);
    box-shadow: var(--shadow-teal);
}

.search-input::placeholder {
    color: var(--color-gray-600);
}

.search-icon {
    position: absolute;
    right: 18px;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    color: var(--color-gray-600);
    pointer-events: none;
}

/* Category Filter */
.category-filter-section {
    background: white;
    border-bottom: 1px solid var(--color-gray-200);
    padding: var(--spacing-lg) 0;
    position: sticky;
    top: 64px;
    z-index: 100;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.category-filter {
    display: inline-flex;
    align-items: center;
    padding: 8px 18px;
    font-size: 13px;
    font-weight: 600;
    border-radius: var(--radius-full);
    border: 2px solid transparent;
    background-color: var(--color-gray-100);
    color: var(--color-gray-700);
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
}

.category-filter:hover {
    background-color: var(--color-gray-200);
    transform: translateY(-1px);
}

.category-filter.active {
    background-color: var(--color-teal-primary);
    color: white;
    box-shadow: var(--shadow-teal);
}

.category-filter.active:hover {
    background-color: var(--color-teal-dark);
}

/* Blog Grid - 3 columns on desktop, 2 on tablet, 1 on mobile */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    max-width: 1200px;
    margin: 0 auto;
}

/* Blog Cards - Compact & Cute */
.blog-card {
    background: white;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-smooth);
    height: 100%;
    display: flex;
    flex-direction: column;
    animation: fadeInUp 0.5s ease-out backwards;
    text-decoration: none;
    color: inherit;
}

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

.blog-card-image-wrapper {
    position: relative;
    overflow: hidden;
    width: 100%;
    height: 160px;
    background-color: var(--color-gray-200);
}

.blog-card-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    transition: transform var(--transition-smooth);
}

/* Lazy loading placeholder */
.blog-card-image[loading="lazy"] {
    background: linear-gradient(90deg, var(--color-gray-200) 25%, var(--color-gray-100) 50%, var(--color-gray-200) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

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

.blog-card-content {
    padding: 14px 16px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.category-badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 9px;
    border-radius: var(--radius-full);
    font-size: 10px;
    font-weight: 600;
    background-color: var(--color-teal-primary);
    color: white;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
    align-self: flex-start;
}

.blog-card-title {
    font-size: 15px;
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-navy);
    margin-bottom: 6px;
    transition: color var(--transition-base);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.blog-card:hover .blog-card-title {
    color: var(--color-teal-primary);
}

.blog-card-excerpt {
    font-size: 12px;
    line-height: 1.5;
    color: var(--color-gray-600);
    margin-bottom: 10px;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.blog-card-meta {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 10px;
    color: var(--color-gray-600);
    padding-top: 8px;
    border-top: 1px solid var(--color-gray-200);
}

.blog-card-meta span {
    display: flex;
    align-items: center;
}

/* Featured Post - Compact */
.featured-post {
    background: white;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-smooth);
    animation: fadeInUp 0.6s ease-out;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
}

.featured-post:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.featured-post-image-wrapper {
    position: relative;
    overflow: hidden;
    height: 100%;
    min-height: 280px;
}

.featured-post-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.featured-post-image[loading="lazy"] {
    background: linear-gradient(90deg, var(--color-gray-200) 25%, var(--color-gray-100) 50%, var(--color-gray-200) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

.featured-post-content {
    padding: 28px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.featured-badge {
    display: inline-flex;
    align-items: center;
    padding: 5px 11px;
    border-radius: var(--radius-full);
    font-size: 10px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-teal-primary), var(--color-teal-dark));
    color: white;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: var(--shadow-teal);
    align-self: flex-start;
}

.featured-title {
    font-size: 22px;
    font-weight: 800;
    line-height: 1.2;
    color: var(--color-navy);
    margin: var(--spacing-md) 0 var(--spacing-md);
    transition: color var(--transition-base);
}

.featured-post:hover .featured-title {
    color: var(--color-teal-primary);
}

.featured-excerpt {
    font-size: 14px;
    line-height: 1.6;
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-md);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.featured-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--color-gray-600);
    padding-top: 12px;
    border-top: 1px solid var(--color-gray-200);
}

/* Newsletter Section */
.newsletter-section {
    background: linear-gradient(135deg, var(--color-teal-primary), var(--color-teal-dark));
    color: white;
    position: relative;
    overflow: hidden;
}

.newsletter-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.newsletter-title {
    font-size: 32px;
    font-weight: 800;
    margin-bottom: var(--spacing-base);
    text-align: center;
}

.newsletter-subtitle {
    font-size: 16px;
    opacity: 0.95;
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.newsletter-form {
    display: flex;
    gap: var(--spacing-md);
    max-width: 480px;
    margin: 0 auto;
}

.newsletter-input {
    flex: 1;
    padding: 14px 18px;
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    font-size: 14px;
    background-color: white;
    font-family: var(--font-primary);
    transition: all var(--transition-base);
}

.newsletter-input:focus {
    outline: none;
    border-color: var(--color-teal-light);
}

.newsletter-button {
    padding: 14px 28px;
    font-size: 14px;
    font-weight: 700;
    background-color: white;
    color: var(--color-teal-primary);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
}

.newsletter-button:hover {
    background-color: var(--color-gray-100);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.newsletter-button:active {
    transform: translateY(0);
}

/* Footer */
.blog-footer {
    background-color: var(--color-navy);
    color: var(--color-gray-300);
}

.footer-link {
    color: var(--color-gray-300);
    text-decoration: none;
    font-size: 14px;
    transition: color var(--transition-base);
    display: inline-block;
}

.footer-link:hover {
    color: white;
    text-decoration: underline;
}

.footer-heading {
    font-size: 16px;
    font-weight: 700;
    color: white;
    margin-bottom: var(--spacing-base);
}

/* Loading Spinner */
.loading-spinner {
    display: inline-block;
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-gray-200);
    border-top-color: var(--color-teal-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Utility Classes */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section-padding {
    padding: var(--spacing-4xl) 0;
}

/* Responsive Design */
@media (max-width: 1200px) {
    .blog-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 18px;
    }
}

@media (max-width: 1024px) {
    .blog-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .featured-title {
        font-size: 20px;
    }
    
    .blog-card-image-wrapper {
        height: 160px;
    }
}

@media (max-width: 768px) {
    .blog-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    
    .hero-title {
        font-size: 30px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .featured-post {
        grid-template-columns: 1fr;
    }
    
    .featured-post-image-wrapper {
        min-height: 200px;
    }
    
    .featured-post-content {
        padding: 24px;
    }
    
    .featured-title {
        font-size: 20px;
    }
    
    .newsletter-title {
        font-size: 26px;
    }
    
    .newsletter-form {
        flex-direction: column;
    }
    
    .category-filter-section {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .blog-card-title {
        font-size: 14px;
    }
    
    .blog-card-excerpt {
        font-size: 12px;
    }
}

@media (max-width: 640px) {
    /* Single column on mobile */
    .blog-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    :root {
        --spacing-4xl: 60px;
    }
    
    .hero-title {
        font-size: 26px;
    }
    
    .blog-card-content {
        padding: 12px 14px;
    }
    
    .blog-card-image-wrapper {
        height: 180px;
    }
    
    .blog-card-title {
        font-size: 15px;
    }
    
    .blog-card-excerpt {
        font-size: 12px;
        -webkit-line-clamp: 2;
    }
    
    .featured-title {
        font-size: 18px;
    }
    
    .featured-excerpt {
        font-size: 13px;
    }
    
    .featured-post-image-wrapper {
        min-height: 180px;
    }
}

/* Accessibility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

:focus-visible {
    outline: 2px solid var(--color-teal-primary);
    outline-offset: 2px;
}