/* ============================================
   CSS Variables & Reset
   ============================================ */
:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #10b981;
    --accent-color: #f59e0b;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --bg-white: #ffffff;
    --bg-gray: #f9fafb;
    --bg-dark: #111827;
    --border-color: #e5e7eb;
    --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);
    --transition: all 0.3s ease;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

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

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

body {
    font-family: var(--font-sans);
    color: var(--text-primary);
    background-color: var(--bg-white);
    line-height: 1.7;
    overflow-x: hidden;
}

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

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

/* ============================================
   Progress Bar
   ============================================ */
.progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    width: 0%;
    z-index: 9999;
    transition: width 0.1s ease;
}

/* ============================================
   Header
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition);
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.logo i {
    font-size: 1.8rem;
}

.visit-btn {
    background: var(--primary-color);
    color: white;
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
}

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

/* ============================================
   Hero Section
   ============================================ */
.hero {
    padding-top: 120px;
    padding-bottom: 60px;
    position: relative;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.05), rgba(16, 185, 129, 0.05));
    z-index: -1;
}

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

.article-meta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.category {
    background: var(--primary-color);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.85rem;
}

.separator {
    color: var(--border-color);
}

.reading-time {
    display: flex;
    align-items: center;
    gap: 5px;
}

.article-title {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.highlight {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.article-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 2rem;
}

.author-info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-top: 2rem;
}

.author-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2rem;
}

.author-details {
    text-align: left;
}

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

.author-bio {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

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

.fade-in-up {
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
}

.delay-1 {
    animation-delay: 0.2s;
}

.delay-2 {
    animation-delay: 0.4s;
}

/* ============================================
   Table of Contents
   ============================================ */
.toc-section {
    background: var(--bg-gray);
    padding: 2rem 0;
}

.toc-wrapper {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.toc-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.toc ul {
    list-style: none;
}

.toc li {
    margin-bottom: 0.75rem;
}

.toc a {
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition);
    display: inline-block;
}

.toc a:hover {
    color: var(--primary-color);
    transform: translateX(5px);
}

/* ============================================
   Article Content
   ============================================ */
.article-content {
    padding: 4rem 0;
}

.content-wrapper {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 3rem;
    max-width: 1200px;
    margin: 0 auto;
    align-items: start;
}

.content-section {
    margin-bottom: 4rem;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease;
}

.content-section.visible {
    opacity: 1;
    transform: translateY(0);
}

.section-heading {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 2rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 1rem;
    padding-bottom: 1rem;
    border-bottom: 3px solid var(--primary-color);
}

.heading-number {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    font-weight: 700;
}

.section-content {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-primary);
}

.section-content p {
    margin-bottom: 1.5rem;
}

.lead-paragraph {
    font-size: 1.25rem;
    line-height: 1.8;
    color: var(--text-primary);
    font-weight: 500;
}

/* Highlight Box */
.highlight-box {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(16, 185, 129, 0.1));
    padding: 1.5rem;
    border-radius: 12px;
    border-left: 4px solid var(--primary-color);
    margin: 2rem 0;
    display: flex;
    gap: 1rem;
}

.highlight-box i {
    font-size: 2rem;
    color: var(--primary-color);
    flex-shrink: 0;
}

.highlight-content h3 {
    font-size: 1.2rem;
    margin-bottom: 0.75rem;
    color: var(--primary-color);
}

/* Info Box */
.info-box {
    background: var(--bg-gray);
    padding: 1.5rem;
    border-radius: 12px;
    margin: 2rem 0;
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.info-box i {
    font-size: 1.5rem;
    color: var(--primary-color);
    flex-shrink: 0;
    margin-top: 2px;
}

/* Feature Cards */
.feature-cards {
    display: grid;
    gap: 2rem;
    margin: 2rem 0;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    border: 2px solid var(--border-color);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.8rem;
    margin-bottom: 1rem;
}

.feature-title {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.feature-desc {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1rem;
}

.feature-rating {
    display: flex;
    align-items: center;
    gap: 10px;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.rating-label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.stars {
    display: flex;
    align-items: center;
    gap: 3px;
}

.stars i {
    color: var(--accent-color);
    font-size: 1rem;
}

.rating-score {
    margin-left: 5px;
    font-weight: 600;
    color: var(--text-primary);
}

/* Experience Grid */
.experience-grid {
    display: grid;
    gap: 1.5rem;
    margin: 2rem 0;
}

.experience-item {
    background: white;
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    border-left: 4px solid var(--primary-color);
}

.exp-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.exp-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.exp-title i {
    color: var(--primary-color);
}

.exp-score {
    background: var(--primary-color);
    color: white;
    padding: 5px 15px;
    border-radius: 20px;
    font-weight: 700;
    font-size: 1.1rem;
}

.exp-desc {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Testimonial */
.testimonial {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: 2rem;
    border-radius: 12px;
    margin: 2rem 0;
    position: relative;
}

.testimonial i {
    font-size: 3rem;
    opacity: 0.3;
    position: absolute;
    top: 1rem;
    left: 1.5rem;
}

.testimonial-text {
    font-size: 1.2rem;
    line-height: 1.8;
    font-style: italic;
    margin-bottom: 1rem;
    padding-left: 3rem;
}

.testimonial-author {
    text-align: right;
    font-weight: 600;
    opacity: 0.9;
}

/* Accordion */
.use-case-accordion {
    margin: 2rem 0;
}

.accordion-item {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    margin-bottom: 1rem;
    overflow: hidden;
    transition: var(--transition);
}

.accordion-item:hover {
    border-color: var(--primary-color);
}

.accordion-header {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 1.5rem;
    cursor: pointer;
    transition: var(--transition);
}

.accordion-header:hover {
    background: var(--bg-gray);
}

.accordion-header i:first-child {
    font-size: 1.8rem;
    color: var(--primary-color);
}

.accordion-header h3 {
    font-size: 1.3rem;
    font-weight: 600;
    flex: 1;
}

.accordion-icon {
    transition: transform 0.3s ease;
}

.accordion-item.active .accordion-icon {
    transform: rotate(180deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.accordion-item.active .accordion-content {
    max-height: 1000px;
}

.accordion-content {
    padding: 0 1.5rem 1.5rem;
}

.check-list {
    list-style: none;
    margin: 1rem 0;
}

.check-list li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
}

.check-list i {
    color: var(--secondary-color);
    margin-top: 3px;
    flex-shrink: 0;
}

.case-result {
    background: var(--bg-gray);
    padding: 1rem;
    border-radius: 8px;
    margin-top: 1rem;
}

/* Pricing Table */
.pricing-comparison {
    margin: 2rem 0;
}

.pricing-table {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.pricing-col {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    position: relative;
    transition: var(--transition);
}

.pricing-col:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.pricing-col.featured {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
}

.plan-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-color);
    color: white;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.plan-header {
    text-align: center;
    padding-bottom: 1.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--border-color);
}

.plan-name {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.plan-price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 5px;
}

.price-amount {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.price-period {
    color: var(--text-secondary);
}

.plan-features {
    list-style: none;
    margin-bottom: 1.5rem;
}

.plan-features li {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0.75rem 0;
    color: var(--text-secondary);
}

.plan-features i {
    color: var(--secondary-color);
    font-size: 1.1rem;
}

.plan-features .not-included {
    opacity: 0.5;
}

.plan-features .not-included i {
    color: var(--text-light);
}

.plan-recommend {
    background: var(--bg-gray);
    padding: 0.75rem;
    border-radius: 8px;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.value-analysis {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    margin-top: 2rem;
}

.value-analysis h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.value-analysis h3 i {
    color: var(--primary-color);
}

.comparison-list {
    list-style: none;
    margin-top: 1rem;
}

.comparison-list li {
    padding: 0.75rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-secondary);
}

.comparison-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: 700;
}

/* Pros & Cons */
.pros-cons-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin: 2rem 0;
}

.pros,
.cons {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.pros-title,
.cons-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.pros-title {
    color: var(--secondary-color);
}

.cons-title {
    color: var(--accent-color);
}

.pros-list,
.cons-list {
    list-style: none;
}

.pros-list li,
.cons-list li {
    margin-bottom: 1.5rem;
}

.pros-list strong,
.cons-list strong {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-size: 1.05rem;
}

.pros-list p,
.cons-list p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin: 0;
}

/* Overall Rating */
.overall-rating {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    margin-top: 2rem;
}

.rating-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 2rem;
    text-align: center;
}

.rating-breakdown {
    margin-bottom: 2rem;
}

.rating-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.rating-label {
    width: 120px;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.rating-bar {
    flex: 1;
    height: 12px;
    background: var(--bg-gray);
    border-radius: 20px;
    overflow: hidden;
}

.rating-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 20px;
    transition: width 1s ease;
}

.rating-value {
    width: 60px;
    text-align: right;
    font-weight: 700;
    color: var(--primary-color);
}

.overall-score {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: 1.5rem;
    border-radius: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.score-label {
    font-size: 1.2rem;
    font-weight: 600;
}

.score-value {
    font-size: 2.5rem;
    font-weight: 700;
}

/* Recommendation Box */
.recommendation-box {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    margin: 2rem 0;
}

.recommendation-box h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.recommendation-box h3 i {
    color: var(--accent-color);
}

.recommendation-grid {
    display: grid;
    gap: 1.5rem;
}

.recommend-item {
    display: flex;
    gap: 1.5rem;
    padding: 1.5rem;
    background: var(--bg-gray);
    border-radius: 12px;
}

.recommend-icon {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.recommend-icon.green {
    background: var(--secondary-color);
    color: white;
}

.recommend-icon.yellow {
    background: var(--accent-color);
    color: white;
}

.recommend-content h4 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.recommend-content ul {
    list-style: none;
}

.recommend-content li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-secondary);
}

.recommend-content li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: 700;
    font-size: 1.2rem;
}

/* Final Thoughts */
.final-thoughts {
    background: var(--bg-gray);
    padding: 2rem;
    border-radius: 12px;
    margin: 2rem 0;
}

.final-thoughts h3 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.final-thoughts h3 i {
    color: var(--primary-color);
}

/* CTA Box */
.cta-box {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: 3rem;
    border-radius: 12px;
    text-align: center;
    margin: 2rem 0;
}

.cta-box h3 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.cta-box p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.cta-button {
    display: inline-block;
    background: white;
    color: var(--primary-color);
    padding: 15px 40px;
    border-radius: 8px;
    font-weight: 700;
    font-size: 1.1rem;
    transition: var(--transition);
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.cta-note {
    margin-top: 1.5rem;
    font-size: 0.9rem;
    opacity: 0.8;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
}

/* ============================================
   Sidebar
   ============================================ */
.sidebar {
    position: relative;
}

.sticky-sidebar {
    position: sticky;
    top: 100px;
}

.sidebar-card {
    background: white;
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    margin-bottom: 1.5rem;
}

.sidebar-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-primary);
}

.sidebar-title i {
    color: var(--primary-color);
}

.quick-info {
    list-style: none;
}

.quick-info li {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.quick-info li:last-child {
    border-bottom: none;
}

.info-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.info-value {
    font-weight: 600;
    color: var(--text-primary);
    text-align: right;
}

.sidebar-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: var(--primary-color);
    color: white;
    padding: 12px;
    border-radius: 8px;
    font-weight: 600;
    margin-top: 1rem;
    transition: var(--transition);
}

.sidebar-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag {
    background: var(--bg-gray);
    color: var(--text-secondary);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    transition: var(--transition);
}

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

.share-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.share-btn {
    padding: 12px;
    border: none;
    border-radius: 8px;
    color: white;
    cursor: pointer;
    font-size: 1.2rem;
    transition: var(--transition);
}

.share-btn:hover {
    transform: translateY(-2px);
}

.share-btn.twitter {
    background: #1da1f2;
}

.share-btn.linkedin {
    background: #0077b5;
}

.share-btn.wechat {
    background: #09b83e;
}

.share-btn.link {
    background: var(--text-secondary);
}

/* ============================================
   Footer CTA
   ============================================ */
.footer-cta {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.footer-cta-content {
    max-width: 700px;
    margin: 0 auto;
}

.footer-cta-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.footer-cta-text {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.footer-cta-btn {
    display: inline-block;
    background: white;
    color: var(--primary-color);
    padding: 15px 40px;
    border-radius: 8px;
    font-weight: 700;
    font-size: 1.1rem;
    transition: var(--transition);
}

.footer-cta-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--bg-dark);
    color: white;
    padding: 2rem 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-text p {
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.disclaimer {
    font-size: 0.85rem;
}

.footer-links {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.footer-links a {
    color: var(--text-light);
    transition: var(--transition);
}

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

/* ============================================
   Back to Top
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    z-index: 999;
}

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-5px);
}

.back-to-top.visible {
    display: flex;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    .content-wrapper {
        grid-template-columns: 1fr;
    }

    .sidebar {
        display: none;
    }

    .pricing-table {
        grid-template-columns: 1fr;
    }

    .pros-cons-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .article-title {
        font-size: 2rem;
    }

    .article-subtitle {
        font-size: 1.05rem;
    }

    .section-heading {
        font-size: 1.5rem;
    }

    .heading-number {
        width: 40px;
        height: 40px;
        font-size: 1.1rem;
    }

    .toc-wrapper {
        padding: 1.5rem;
    }

    .footer-content {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }

    .footer-cta-title {
        font-size: 1.8rem;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
}

@media (max-width: 480px) {
    .article-meta {
        flex-wrap: wrap;
    }

    .article-title {
        font-size: 1.6rem;
    }

    .hero {
        padding-top: 100px;
    }

    .cta-box {
        padding: 2rem 1.5rem;
    }

    .cta-box h3 {
        font-size: 1.5rem;
    }
}