/* ==========================================
   CSS Variables - Global Design System
   ========================================== */
:root {
    /* Primary Colors */
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #dbeafe;

    /* Secondary Colors */
    --secondary-color: #64748b;
    --secondary-hover: #475569;

    /* Neutral Colors */
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;

    /* Semantic Colors */
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --info-color: #3b82f6;

    /* Background Colors */
    --bg-white: #ffffff;
    --bg-light: #f8fafc;
    --bg-gray: #f1f5f9;

    /* Text Colors */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;

    /* 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;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'Courier New', monospace;

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 200ms ease-in-out;
    --transition-slow: 300ms ease-in-out;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

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

/* ==========================================
   Typography
   ========================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-xl);
}

h2 {
    font-size: 2rem;
    margin-bottom: var(--spacing-lg);
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.25rem;
}

h5 {
    font-size: 1.125rem;
}

h6 {
    font-size: 1rem;
}

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

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

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

/* ==========================================
   Layout Components
   ========================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section {
    padding: var(--spacing-3xl) 0;
}

.section-light {
    background-color: var(--bg-white);
}

.section-gray {
    background-color: var(--bg-gray);
}

/* ==========================================
   Header
   ========================================== */
.site-header {
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--gray-200);
    padding: var(--spacing-lg) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo-section {
    flex: 1;
}

.site-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 0;
    margin-bottom: 0.25rem;
}

.site-title a {
    color: var(--primary-color);
}

.site-tagline {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin: 0;
}

.main-nav ul {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
    margin: 0;
}

.main-nav a {
    color: var(--text-secondary);
    font-weight: 500;
    transition: color var(--transition-base);
}

.main-nav a:hover {
    color: var(--primary-color);
}

/* ==========================================
   Hero Section
   ========================================== */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    color: white;
    padding: var(--spacing-3xl) 0;
}

.hero-content {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.hero-section h2 {
    color: white;
    font-size: 3rem;
    margin-bottom: var(--spacing-lg);
}

.hero-section p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xl);
}

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

/* ==========================================
   Buttons
   ========================================== */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: white;
}

.btn-secondary {
    background-color: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-read-more {
    display: inline-block;
    color: var(--primary-color);
    font-weight: 600;
    transition: all var(--transition-base);
}

.btn-read-more:hover {
    transform: translateX(4px);
}

/* ==========================================
   Featured Section
   ========================================== */
.featured-section {
    padding: var(--spacing-3xl) 0;
    background-color: var(--bg-white);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

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

.section-header p {
    font-size: 1.125rem;
    color: var(--text-muted);
}

.featured-article {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-3xl);
    background-color: var(--bg-white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-3xl);
    box-shadow: var(--shadow-lg);
}

.article-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.image-placeholder {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    font-weight: 700;
}

.article-content h3 {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-lg);
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--gray-200);
}

.meta-date,
.meta-category {
    color: var(--text-muted);
    font-size: 0.875rem;
}

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

.stars {
    color: var(--warning-color);
    font-size: 1.125rem;
}

.rating-number {
    font-weight: 600;
    color: var(--text-primary);
}

.article-highlights {
    display: flex;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--gray-200);
}

.highlight-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.highlight-label {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.highlight-value {
    font-weight: 600;
    color: var(--primary-color);
}

/* ==========================================
   Reviews Section
   ========================================== */
.reviews-section {
    padding: var(--spacing-3xl) 0;
    background-color: var(--bg-light);
}

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.review-card {
    background-color: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
}

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

.card-image {
    position: relative;
}

.card-image .image-placeholder {
    height: 200px;
    font-size: 1.25rem;
}

.card-badge {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
}

.card-content {
    padding: var(--spacing-xl);
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.meta-date {
    font-size: 0.875rem;
}

.card-content h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
}

.card-content p {
    flex-grow: 1;
    margin-bottom: var(--spacing-lg);
}

.card-stats {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--gray-200);
}

.stat-item {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* ==========================================
   Badges
   ========================================== */
.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-new {
    background-color: var(--success-color);
    color: white;
}

.badge-featured {
    background-color: var(--warning-color);
    color: white;
}

.badge-popular {
    background-color: var(--primary-color);
    color: white;
}

/* ==========================================
   Categories Section
   ========================================== */
.categories-section {
    padding: var(--spacing-3xl) 0;
    background-color: var(--bg-white);
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.category-card {
    background-color: var(--bg-white);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    transition: all var(--transition-base);
    cursor: pointer;
}

.category-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
    background-color: var(--primary-light);
}

.category-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.category-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.category-card p {
    color: var(--text-muted);
    margin-bottom: var(--spacing-md);
}

.category-link {
    color: var(--primary-color);
    font-weight: 600;
    transition: all var(--transition-base);
}

.category-link:hover {
    transform: translateX(4px);
}

/* ==========================================
   Top Rated Section
   ========================================== */
.top-rated-section {
    padding: var(--spacing-3xl) 0;
    background-color: var(--bg-light);
}

.rankings-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-3xl);
}

.ranking-item {
    background-color: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    display: flex;
    gap: var(--spacing-xl);
    transition: all var(--transition-base);
}

.ranking-item:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-xl);
}

.rank-badge {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-width: 100px;
}

.rank-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1;
}

.rank-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.ranking-content {
    flex: 1;
}

.ranking-content h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

.ranking-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.rating-score {
    font-weight: 600;
    color: var(--text-primary);
}

.review-count {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.ranking-features {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin: var(--spacing-lg) 0;
}

.feature-tag {
    background-color: var(--primary-light);
    color: var(--primary-color);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
}

.ranking-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

/* ==========================================
   Info Box
   ========================================== */
.info-box {
    border-left: 4px solid var(--info-color);
    background-color: var(--primary-light);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-3xl);
}

.info-box h4 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.info-box p {
    margin-bottom: 0;
}

/* ==========================================
   Comparison Section
   ========================================== */
.comparison-section {
    margin-top: var(--spacing-3xl);
    padding: var(--spacing-3xl);
    background-color: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.comparison-section h3 {
    margin-bottom: var(--spacing-xl);
}

.table-responsive {
    overflow-x: auto;
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
}

.comparison-table th {
    background-color: var(--gray-100);
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 700;
    color: var(--text-primary);
    border-bottom: 2px solid var(--gray-300);
}

.comparison-table td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--gray-200);
    color: var(--text-secondary);
}

.comparison-table tr:hover {
    background-color: var(--gray-50);
}

.comparison-table .highlight-row {
    background-color: var(--primary-light);
}

.comparison-table .highlight-row:hover {
    background-color: var(--primary-light);
}

/* ==========================================
   CTA Section
   ========================================== */
.cta-section {
    background-color: var(--bg-gray);
    padding: var(--spacing-3xl) 0;
}

.cta-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.cta-content h2 {
    font-size: 2rem;
    margin-bottom: var(--spacing-lg);
}

.cta-content p {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xl);
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-xl);
}

.cta-features {
    display: flex;
    gap: var(--spacing-xl);
    justify-content: center;
    flex-wrap: wrap;
}

.cta-feature {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-secondary);
}

.feature-icon {
    color: var(--success-color);
    font-weight: 700;
    font-size: 1.25rem;
}

/* ==========================================
   Footer
   ========================================== */
.site-footer {
    background-color: var(--gray-900);
    color: var(--gray-300);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-3xl);
}

.footer-section h4 {
    color: white;
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
}

.footer-section p {
    color: var(--gray-400);
    margin-bottom: var(--spacing-md);
}

.footer-section ul {
    list-style: none;
}

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

.footer-section a {
    color: var(--gray-400);
    transition: color var(--transition-base);
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid var(--gray-800);
    padding-top: var(--spacing-xl);
    text-align: center;
    color: var(--gray-500);
}

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

/* ==========================================
   Responsive Design
   ========================================== */

/* Tablet */
@media (max-width: 1024px) {
    .featured-article {
        grid-template-columns: 1fr;
    }

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

/* Mobile */
@media (max-width: 768px) {
    html {
        font-size: 14px;
    }

    .header-content {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .main-nav ul {
        gap: var(--spacing-md);
        flex-wrap: wrap;
        justify-content: center;
    }

    .hero-section h2 {
        font-size: 2rem;
    }

    .hero-section p {
        font-size: 1rem;
    }

    .reviews-grid {
        grid-template-columns: 1fr;
    }

    .categories-grid {
        grid-template-columns: 1fr;
    }

    .ranking-item {
        flex-direction: column;
        text-align: center;
    }

    .ranking-actions {
        flex-direction: column;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    .site-title {
        font-size: 1.125rem;
    }

    .hero-section h2 {
        font-size: 1.75rem;
    }

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

    .article-highlights {
        flex-direction: column;
    }
}