/* ===================================
   CSS Variables for Theming
   =================================== */
:root {
    /* Primary Colors */
    --color-primary: #2563eb;
    --color-primary-dark: #1e40af;
    --color-primary-light: #3b82f6;

    /* Secondary Colors */
    --color-secondary: #64748b;
    --color-secondary-dark: #475569;
    --color-secondary-light: #94a3b8;

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

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

    /* Background Colors */
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f8fafc;
    --color-bg-tertiary: #f1f5f9;

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

    /* Border & Shadow */
    --border-radius: 0.5rem;
    --border-radius-lg: 0.75rem;
    --border-radius-xl: 1rem;
    --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-size-base: 1rem;
    --line-height-base: 1.6;

    /* 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;

    /* Container */
    --container-max-width: 1200px;

    /* 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);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===================================
   Typography
   =================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
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(--color-text-secondary);
}

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

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

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

/* ===================================
   Header
   =================================== */
.header {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
    color: white;
    padding: var(--spacing-lg) 0;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.logo h1 {
    color: white;
    font-size: 1.75rem;
    margin-bottom: var(--spacing-xs);
}

.tagline {
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.875rem;
    margin: 0;
}

.nav ul {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.nav a {
    color: white;
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    transition: background-color var(--transition-fast);
}

.nav a:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
}

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

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: white;
}

.btn-secondary {
    background-color: var(--color-gray-100);
    color: var(--color-primary);
    border: 2px solid var(--color-gray-200);
}

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

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

.featured-article {
    position: relative;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-2xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.featured-badge {
    display: inline-block;
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.featured-article h2 {
    color: white;
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
}

.featured-excerpt {
    color: rgba(255, 255, 255, 0.95);
    font-size: 1.125rem;
    line-height: 1.7;
    margin-bottom: var(--spacing-xl);
}

/* ===================================
   Article Meta
   =================================== */
.article-meta {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    margin-bottom: var(--spacing-lg);
    font-size: 0.875rem;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: rgba(255, 255, 255, 0.9);
}

.meta-label {
    font-weight: 600;
    color: rgba(255, 255, 255, 0.7);
}

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

.section-title {
    text-align: center;
    font-size: 2rem;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-2xl);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    margin: var(--spacing-md) auto 0;
    border-radius: 2px;
}

/* ===================================
   Reviews Section
   =================================== */
.reviews-section {
    background-color: var(--color-bg-secondary);
}

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-xl);
}

/* ===================================
   Review Cards
   =================================== */
.review-card {
    background: white;
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    position: relative;
    border: 1px solid var(--color-gray-200);
}

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

.card-badge {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius);
    font-size: 0.75rem;
    font-weight: 600;
}

.review-card h3 {
    color: var(--color-text-primary);
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
    line-height: 1.4;
    padding-right: 80px;
}

.review-card .article-meta {
    border-bottom: 1px solid var(--color-gray-200);
    padding-bottom: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.review-card .meta-item {
    color: var(--color-text-tertiary);
    font-size: 0.875rem;
}

.card-excerpt {
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-lg);
    font-size: 0.9375rem;
}

/* ===================================
   Rating Stars
   =================================== */
.rating {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.stars {
    color: #f59e0b;
    font-size: 1.125rem;
    letter-spacing: 2px;
}

.rating-text {
    font-weight: 600;
    color: var(--color-text-primary);
    font-size: 1rem;
}

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

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

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.category-card {
    background: linear-gradient(135deg, white 0%, var(--color-gray-50) 100%);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    transition: all var(--transition-base);
    border: 2px solid var(--color-gray-200);
}

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

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

.category-card h3 {
    color: var(--color-text-primary);
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
}

.category-card p {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    margin-bottom: var(--spacing-lg);
}

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

.category-link:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

/* ===================================
   Top Rated Section
   =================================== */
.top-rated-section {
    background-color: var(--color-bg-secondary);
}

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

.top-rated-item {
    background: white;
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    display: flex;
    gap: var(--spacing-lg);
    border: 2px solid var(--color-gray-200);
    transition: all var(--transition-base);
}

.top-rated-item:hover {
    box-shadow: var(--shadow-xl);
    border-color: var(--color-primary);
}

.rank-badge {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    box-shadow: var(--shadow-md);
}

.rank-1 .rank-badge {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
}

.top-rated-content {
    flex: 1;
}

.top-rated-content h3 {
    color: var(--color-text-primary);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

.top-rated-description {
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
}

.top-rated-features {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.feature-badge {
    background-color: var(--color-gray-100);
    color: var(--color-primary);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    font-weight: 600;
    border: 1px solid var(--color-gray-200);
}

.service-area {
    color: var(--color-text-tertiary);
    font-size: 0.9375rem;
    margin: 0;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-gray-200);
}

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

.comparison-section h3 {
    color: var(--color-text-primary);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.table-wrapper {
    overflow-x: auto;
    margin-bottom: var(--spacing-md);
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.comparison-table thead {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
    color: white;
}

.comparison-table th {
    padding: var(--spacing-md) var(--spacing-lg);
    text-align: left;
    font-weight: 600;
    font-size: 1rem;
}

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

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

.comparison-table tbody tr:last-child td {
    border-bottom: none;
}

/* ===================================
   Info Boxes
   =================================== */
.info-boxes-section {
    background-color: var(--color-bg-primary);
}

.info-box {
    background: white;
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    border-left: 4px solid var(--color-info);
    box-shadow: var(--shadow-md);
}

.info-box h3 {
    color: var(--color-text-primary);
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
}

.info-box p {
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 0;
}

.info-box.success {
    border-left-color: var(--color-success);
}

.info-box.success h3 {
    color: var(--color-success);
}

.info-box.warning {
    border-left-color: var(--color-warning);
}

.info-box.warning h3 {
    color: var(--color-warning);
}

.info-box.info {
    border-left-color: var(--color-info);
}

.info-box.info h3 {
    color: var(--color-info);
}

/* ===================================
   Footer
   =================================== */
.footer {
    background: linear-gradient(135deg, var(--color-gray-800) 0%, var(--color-gray-900) 100%);
    color: var(--color-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-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-section h4 {
    color: white;
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
}

.footer-section p {
    color: var(--color-gray-400);
    font-size: 0.9375rem;
    line-height: 1.6;
}

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

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

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

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

.footer-bottom {
    border-top: 1px solid var(--color-gray-700);
    padding-top: var(--spacing-lg);
    text-align: center;
}

.footer-bottom p {
    color: var(--color-gray-400);
    font-size: 0.875rem;
    margin: 0;
}

.footer-bottom a {
    color: var(--color-gray-400);
    text-decoration: underline;
}

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

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

/* Tablet */
@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.25rem; }

    .header-content {
        flex-direction: column;
        text-align: center;
    }

    .nav ul {
        justify-content: center;
    }

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

    .featured-article h2 {
        font-size: 1.5rem;
    }

    .section-title {
        font-size: 1.75rem;
    }

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

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

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

    .rank-badge {
        margin: 0 auto;
    }

    .comparison-table {
        font-size: 0.875rem;
    }

    .comparison-table th,
    .comparison-table td {
        padding: var(--spacing-sm) var(--spacing-md);
    }
}

/* Mobile */
@media (max-width: 480px) {
    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.125rem; }

    .container {
        padding: 0 var(--spacing-md);
    }

    .nav ul {
        flex-direction: column;
        gap: var(--spacing-sm);
        width: 100%;
    }

    .nav a {
        display: block;
        text-align: center;
    }

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

    .article-meta {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .review-card {
        padding: var(--spacing-lg);
    }

    .review-card h3 {
        padding-right: 0;
        margin-top: 40px;
    }

    .card-badge {
        top: var(--spacing-sm);
        right: var(--spacing-sm);
    }

    .top-rated-features {
        justify-content: center;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
}

/* ===================================
   Utility Classes
   =================================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.pt-sm { padding-top: var(--spacing-sm); }
.pt-md { padding-top: var(--spacing-md); }
.pt-lg { padding-top: var(--spacing-lg); }
.pt-xl { padding-top: var(--spacing-xl); }

.pb-sm { padding-bottom: var(--spacing-sm); }
.pb-md { padding-bottom: var(--spacing-md); }
.pb-lg { padding-bottom: var(--spacing-lg); }
.pb-xl { padding-bottom: var(--spacing-xl); }