/* ============================================
   BlogInsight - Enterprise Grade Stylesheet
   Modern, Accessible, Performance-Optimized
   ============================================ */

/* CSS Variables / Design Tokens */
:root {
    /* Colors - Light Mode */
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-primary-light: #3b82f6;
    --color-secondary: #7c3aed;
    --color-accent: #06b6d4;
    
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-info: #3b82f6;
    
    --color-text-primary: #1f2937;
    --color-text-secondary: #4b5563;
    --color-text-muted: #6b7280;
    --color-text-inverse: #ffffff;
    
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f9fafb;
    --color-bg-tertiary: #f3f4f6;
    --color-bg-card: #ffffff;
    
    --color-border: #e5e7eb;
    --color-border-light: #f3f4f6;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
    --gradient-secondary: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
    --gradient-hero: linear-gradient(135deg, #1e3a8a 0%, #7c3aed 50%, #2563eb 100%);
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-serif: 'Merriweather', Georgia, 'Times New Roman', 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;
    --font-size-5xl: 3rem;
    
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;
    
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    /* 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;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --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);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* Z-Index */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-toast: 600;
    
    /* Container */
    --container-max-width: 1280px;
    --container-padding: 1rem;
    
    /* Header */
    --header-height: 72px;
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --color-text-primary: #f9fafb;
    --color-text-secondary: #d1d5db;
    --color-text-muted: #9ca3af;
    
    --color-bg-primary: #111827;
    --color-bg-secondary: #1f2937;
    --color-bg-tertiary: #374151;
    --color-bg-card: #1f2937;
    
    --color-border: #374151;
    --color-border-light: #4b5563;
    
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3), 0 2px 4px -2px rgb(0 0 0 / 0.3);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.3), 0 4px 6px -4px rgb(0 0 0 / 0.3);
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

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

/* Focus Styles for Accessibility */
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Skip Link for Accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: var(--color-text-inverse);
    padding: var(--spacing-sm) var(--spacing-md);
    z-index: var(--z-toast);
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 0;
}

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

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

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-secondary);
}

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

a:hover {
    color: var(--color-primary-dark);
}

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

/* ============================================
   Header
   ============================================ */
.header {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    background: var(--color-bg-primary);
    border-bottom: 1px solid var(--color-border);
    transition: box-shadow var(--transition-normal);
}

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

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    gap: var(--spacing-lg);
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo-text {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-extrabold);
    color: var(--color-text-primary);
}

.logo-accent {
    color: var(--color-primary);
}

/* Navigation */
.main-nav {
    display: none;
}

@media (min-width: 1024px) {
    .main-nav {
        display: block;
    }
}

.nav-list {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    list-style: none;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    background: none;
    border: none;
    cursor: pointer;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
    background: var(--color-bg-secondary);
}

/* Dropdown */
.nav-dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 220px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-sm);
    list-style: none;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-normal);
}

.nav-dropdown:hover .dropdown-menu,
.nav-dropdown:focus-within .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.dropdown-menu li a:hover {
    background: var(--color-bg-secondary);
    color: var(--color-primary);
}

.dropdown-menu li a i {
    width: 20px;
    color: var(--color-text-muted);
}

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.search-toggle,
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--color-bg-secondary);
    border: none;
    border-radius: var(--radius-full);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.search-toggle:hover,
.theme-toggle:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-primary);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    cursor: pointer;
    gap: 5px;
}

@media (min-width: 1024px) {
    .mobile-menu-toggle {
        display: none;
    }
}

.hamburger-line {
    width: 24px;
    height: 2px;
    background: var(--color-text-primary);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.mobile-menu-toggle.active .hamburger-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.mobile-menu-toggle.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active .hamburger-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Search Overlay */
.search-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    z-index: var(--z-modal);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 120px;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.search-overlay.active {
    opacity: 1;
    visibility: visible;
}

.search-container {
    width: 100%;
    max-width: 640px;
    padding: 0 var(--spacing-md);
}

.search-form {
    display: flex;
    background: var(--color-bg-primary);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-2xl);
}

.search-input {
    flex: 1;
    padding: var(--spacing-lg) var(--spacing-xl);
    font-size: var(--font-size-lg);
    border: none;
    background: transparent;
    color: var(--color-text-primary);
}

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

.search-submit {
    padding: var(--spacing-lg) var(--spacing-xl);
    background: var(--color-primary);
    border: none;
    color: var(--color-text-inverse);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.search-submit:hover {
    background: var(--color-primary-dark);
}

.search-close {
    position: absolute;
    top: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-card);
    border: none;
    border-radius: var(--radius-full);
    color: var(--color-text-primary);
    cursor: pointer;
    font-size: var(--font-size-xl);
}

.search-suggestions {
    margin-top: var(--spacing-md);
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

/* Mobile Navigation */
.mobile-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg-primary);
    z-index: var(--z-fixed);
    padding: var(--spacing-xl);
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
}

.mobile-nav.active {
    transform: translateX(0);
}

.mobile-nav-list {
    list-style: none;
}

.mobile-nav-list li {
    border-bottom: 1px solid var(--color-border);
}

.mobile-nav-list a {
    display: block;
    padding: var(--spacing-md) 0;
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
}

/* ============================================
   Hero Section
   ============================================ */
.hero-section {
    padding: var(--spacing-3xl) 0;
    background: var(--gradient-hero);
    color: var(--color-text-inverse);
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
    position: relative;
    z-index: 1;
}

@media (min-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr 1fr;
    }
}

.hero-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--spacing-md);
}

.hero-title {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-extrabold);
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-inverse);
}

@media (min-width: 768px) {
    .hero-title {
        font-size: var(--font-size-5xl);
    }
}

.text-gradient {
    background: linear-gradient(135deg, #fbbf24 0%, #f97316 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: var(--font-size-lg);
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-xl);
    max-width: 500px;
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

/* Featured Article in Hero */
.hero-featured {
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.hero-featured .featured-card {
    display: block;
    color: var(--color-text-inverse);
}

.hero-featured .featured-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-md);
}

.hero-featured .featured-category {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-primary);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    margin-bottom: var(--spacing-sm);
}

.hero-featured .featured-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-inverse);
}

.hero-featured .featured-meta {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.7);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-lg);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-text-inverse);
    border-color: var(--color-primary);
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: var(--color-text-inverse);
}

.btn-secondary {
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
    border-color: var(--color-border);
}

.btn-secondary:hover {
    background: var(--color-bg-tertiary);
    border-color: var(--color-primary);
}

.btn-outline {
    background: transparent;
    color: var(--color-text-inverse);
    border-color: rgba(255, 255, 255, 0.5);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--color-text-inverse);
    color: var(--color-text-inverse);
}

.btn-white {
    background: var(--color-text-inverse);
    color: var(--color-primary);
    border-color: var(--color-text-inverse);
}

.btn-white:hover {
    background: var(--color-bg-secondary);
    color: var(--color-primary-dark);
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-base);
}

/* ============================================
   Sections
   ============================================ */
.section {
    padding: var(--spacing-3xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-muted);
}

/* ============================================
   Content Grid (Main + Sidebar)
   ============================================ */
.content-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
}

@media (min-width: 1024px) {
    .content-grid {
        grid-template-columns: 1fr 340px;
    }
}

/* ============================================
   Articles Grid
   ============================================ */
.articles-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
}

@media (min-width: 640px) {
    .articles-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Article Card */
.article-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-xl);
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: all var(--transition-normal);
}

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

.article-card-link {
    display: block;
    text-decoration: none;
    color: inherit;
}

.article-image-container {
    position: relative;
    padding-top: 56.25%; /* 16:9 Aspect Ratio */
    overflow: hidden;
}

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

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

.article-category {
    position: absolute;
    top: var(--spacing-md);
    left: var(--spacing-md);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-primary);
    color: var(--color-text-inverse);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    border-radius: var(--radius-sm);
}

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

.article-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-excerpt {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

.article-author {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.author-avatar {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-full);
    object-fit: cover;
}

.article-stats {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.article-stats span {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

/* Load More */
.load-more-container {
    text-align: center;
    margin-top: var(--spacing-2xl);
}

/* ============================================
   Sidebar Widgets
   ============================================ */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.widget {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
}

.widget-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-primary);
}

/* Search Widget */
.widget-search-form {
    display: flex;
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.widget-search-form input {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    background: transparent;
    color: var(--color-text-primary);
}

.widget-search-form button {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-primary);
    border: none;
    color: var(--color-text-inverse);
    cursor: pointer;
}

/* Popular Posts */
.popular-post-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--color-border-light);
}

.popular-post-item:last-child {
    border-bottom: none;
}

.popular-post-image {
    width: 80px;
    height: 60px;
    object-fit: cover;
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.popular-post-content {
    flex: 1;
    min-width: 0;
}

.popular-post-title {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.popular-post-meta {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

/* Categories Widget */
.widget-categories .category-list {
    list-style: none;
}

.widget-categories .category-list li {
    border-bottom: 1px solid var(--color-border-light);
}

.widget-categories .category-list li:last-child {
    border-bottom: none;
}

.widget-categories .category-list a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.widget-categories .category-list a:hover {
    color: var(--color-primary);
    padding-left: var(--spacing-sm);
}

.widget-categories .category-list i {
    width: 20px;
    color: var(--color-text-muted);
}

/* Newsletter Widget */
.widget-newsletter p {
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-md);
}

.newsletter-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.newsletter-form input {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
}

.newsletter-note {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    margin-top: var(--spacing-sm);
    margin-bottom: 0;
}

/* Social Widget */
.social-links {
    display: flex;
    gap: var(--spacing-sm);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--color-bg-secondary);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.social-link:hover {
    transform: translateY(-2px);
}

.social-link.facebook:hover { background: #1877f2; color: white; }
.social-link.twitter:hover { background: #1da1f2; color: white; }
.social-link.instagram:hover { background: linear-gradient(45deg, #f09433, #e6683c, #dc2743, #cc2366, #bc1888); color: white; }
.social-link.linkedin:hover { background: #0a66c2; color: white; }
.social-link.rss:hover { background: #f26522; color: white; }

/* ============================================
   Categories Showcase
   ============================================ */
.categories-showcase {
    background: var(--color-bg-secondary);
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

@media (min-width: 768px) {
    .categories-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 1024px) {
    .categories-grid {
        grid-template-columns: repeat(6, 1fr);
    }
}

.category-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
    background: var(--color-bg-card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    text-decoration: none;
    transition: all var(--transition-normal);
}

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

.category-card i {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
}

.category-card h3 {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.category-card p {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    margin-bottom: 0;
    display: none;
}

@media (min-width: 768px) {
    .category-card p {
        display: block;
    }
}

.category-tech:hover { border-color: #3b82f6; }
.category-tech:hover i { color: #3b82f6; }

.category-lifestyle:hover { border-color: #ec4899; }
.category-lifestyle:hover i { color: #ec4899; }

.category-business:hover { border-color: #8b5cf6; }
.category-business:hover i { color: #8b5cf6; }

.category-health:hover { border-color: #10b981; }
.category-health:hover i { color: #10b981; }

.category-travel:hover { border-color: #f59e0b; }
.category-travel:hover i { color: #f59e0b; }

.category-science:hover { border-color: #06b6d4; }
.category-science:hover i { color: #06b6d4; }

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
    background: var(--gradient-primary);
    color: var(--color-text-inverse);
    text-align: center;
}

.cta-content h2 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-md);
    color: var(--color-text-inverse);
}

.cta-content p {
    font-size: var(--font-size-lg);
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-xl);
}

/* ============================================
   Ad Containers
   ============================================ */
.ad-container {
    padding: var(--spacing-md) 0;
    background: var(--color-bg-secondary);
}

.ad-banner {
    margin: var(--spacing-xl) 0;
}

.widget-ad {
    min-height: 250px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-secondary);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--color-bg-secondary);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

@media (min-width: 640px) {
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .footer-grid {
        grid-template-columns: 2fr 1fr 1fr 1fr;
    }
}

.footer-logo {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-extrabold);
    color: var(--color-text-primary);
    text-decoration: none;
    display: inline-block;
    margin-bottom: var(--spacing-md);
}

.footer-logo span {
    color: var(--color-primary);
}

.footer-about {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
}

.footer-social {
    display: flex;
    gap: var(--spacing-sm);
}

.footer-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.footer-social a:hover {
    background: var(--color-primary);
    color: var(--color-text-inverse);
}

.footer-col h4 {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-md);
}

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

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

.footer-links a {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
}

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

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

.footer-bottom p {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xs);
}

.footer-credit {
    color: var(--color-text-muted);
}

.footer-credit i {
    color: var(--color-error);
}

/* ============================================
   Back to Top Button
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary);
    color: var(--color-text-inverse);
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-lg);
    z-index: var(--z-fixed);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
}

/* ============================================
   Toast Notifications
   ============================================ */
.toast-container {
    position: fixed;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    border-left: 4px solid var(--color-primary);
    animation: slideUp 0.3s ease;
}

.toast.success { border-left-color: var(--color-success); }
.toast.error { border-left-color: var(--color-error); }
.toast.warning { border-left-color: var(--color-warning); }

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

/* ============================================
   Loading Skeleton
   ============================================ */
.loading-skeleton {
    display: contents;
}

.skeleton-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    overflow: hidden;
}

.skeleton-card::before {
    content: '';
    display: block;
    padding-top: 56.25%;
    background: linear-gradient(90deg, var(--color-bg-secondary) 25%, var(--color-bg-tertiary) 50%, var(--color-bg-secondary) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

.skeleton-card::after {
    content: '';
    display: block;
    height: 120px;
    padding: var(--spacing-lg);
    background: var(--color-bg-card);
}

.skeleton-mini {
    height: 70px;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(90deg, var(--color-bg-secondary) 25%, var(--color-bg-tertiary) 50%, var(--color-bg-secondary) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-md);
}

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

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

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.hidden { display: none !important; }
.visible { display: block !important; }

/* ============================================
   Print Styles
   ============================================ */
@media print {
    .header,
    .footer,
    .sidebar,
    .back-to-top,
    .ad-container {
        display: none !important;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.5;
    }
    
    a {
        text-decoration: underline;
    }
}