/* ==========================================
   DESIGN SYSTEM & VARIABLES - 机场速递
   ========================================== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

:root {
  /* Colors - Light Theme */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  
  --accent-primary: #3b82f6;
  --accent-secondary: #6366f1;
  --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #6366f1 100%);
  --accent-soft: rgba(59, 130, 246, 0.08);
  
  --success: #10b981;
  --success-soft: rgba(16, 185, 129, 0.08);
  --warning: #f59e0b;
  
  --border-color: #e2e8f0;
  --border-hover: #cbd5e1;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.02);
  --shadow-premium: 0 20px 25px -5px rgba(59, 130, 246, 0.05), 0 10px 10px -5px rgba(59, 130, 246, 0.02);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --header-height: 72px;
}

[data-theme="dark"] {
  /* Colors - Dark Theme */
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-tertiary: #1f2937;
  
  --text-primary: #f9fafb;
  --text-secondary: #d1d5db;
  --text-muted: #9ca3af;
  
  --accent-primary: #60a5fa;
  --accent-secondary: #818cf8;
  --accent-gradient: linear-gradient(135deg, #60a5fa 0%, #818cf8 100%);
  --accent-soft: rgba(96, 165, 250, 0.12);
  
  --success: #34d399;
  --success-soft: rgba(52, 211, 153, 0.12);
  
  --border-color: #1f2937;
  --border-hover: #374151;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
  --shadow-premium: 0 20px 25px -5px rgba(96, 165, 250, 0.08);
}

/* ==========================================
   BASE STYLES
   ========================================== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-secondary);
  line-height: 1.6;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Outfit', sans-serif;
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.25;
}

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

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

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

ul, ol {
  list-style: none;
}

/* Layout container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================
   HEADER & NAVIGATION
   ========================================== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background-color: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

[data-theme="dark"] .header {
  background-color: rgba(11, 15, 25, 0.8);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.5rem;
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-family: 'Outfit', sans-serif;
}

.logo svg {
  fill: url(#logo-grad);
}

.nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  position: relative;
}

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

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

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

.theme-toggle svg {
  width: 20px;
  height: 20px;
}

.theme-toggle .sun-icon { display: block; }
.theme-toggle .moon-icon { display: none; }

[data-theme="dark"] .theme-toggle .sun-icon { display: none; }
[data-theme="dark"] .theme-toggle .moon-icon { display: block; }

.menu-toggle {
  display: none;
  font-size: 1.5rem;
  color: var(--text-primary);
}

/* ==========================================
   HERO / BILLBOARD SECTION
   ========================================== */
.hero-section {
  padding: 60px 0 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -20%;
  width: 140%;
  height: 200%;
  background-image: radial-gradient(circle, rgba(59, 130, 246, 0.05) 1px, transparent 1px);
  background-size: 24px 24px;
  z-index: -1;
  pointer-events: none;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-primary);
  background-color: var(--accent-soft);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  margin-bottom: 20px;
  border: 1px solid rgba(59, 130, 246, 0.15);
}

.hero-title {
  font-size: 2.8rem;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.hero-title span {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.15rem;
  max-width: 600px;
  margin: 0 auto 30px;
  color: var(--text-muted);
}

/* Key features grid */
.features-badge-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  max-width: 800px;
  margin: 0 auto;
}

.feature-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.feature-badge:hover {
  border-color: var(--accent-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.feature-badge svg {
  width: 16px;
  height: 16px;
  fill: var(--accent-primary);
}

/* Search bar on home */
.search-container {
  max-width: 500px;
  margin: 30px auto 0;
  position: relative;
}

.search-input {
  width: 100%;
  padding: 14px 20px 14px 48px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: inherit;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.search-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.15);
}

.search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.search-icon svg {
  width: 20px;
  height: 20px;
}

/* ==========================================
   MAIN TWO-COLUMN LAYOUT
   ========================================== */
.main-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 32px;
  padding: 40px 0;
}

/* Left - Article Feed */
.content-feed {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.feed-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 12px;
  margin-bottom: 8px;
}

.feed-title {
  font-size: 1.4rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

.feed-title::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 20px;
  background: var(--accent-gradient);
  border-radius: var(--radius-full);
}

.active-filter-indicator {
  font-size: 0.85rem;
  color: var(--accent-primary);
  background-color: var(--accent-soft);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  display: none;
}

/* Article Cards */
.article-card {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 20px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

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

.card-image-wrap {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 160px;
  overflow: hidden;
}

.card-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

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

.card-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background-color: rgba(15, 23, 42, 0.8);
  color: #ffffff;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  backdrop-filter: blur(4px);
}

.card-content {
  padding: 20px;
  display: flex;
  flex-direction: column;
}

.card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  align-items: center;
}

.card-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

.card-meta svg {
  width: 14px;
  height: 14px;
  fill: currentColor;
}

.card-title {
  font-size: 1.15rem;
  margin-bottom: 10px;
  line-height: 1.4;
}

.card-title a:hover {
  color: var(--accent-primary);
}

.card-excerpt {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

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

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.card-tag {
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  background-color: var(--bg-tertiary);
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.card-tag:hover {
  background-color: var(--accent-soft);
  color: var(--accent-primary);
}

.read-more {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-primary);
}

.read-more svg {
  width: 14px;
  height: 14px;
  fill: currentColor;
  transition: transform var(--transition-fast);
}

.read-more:hover svg {
  transform: translateX(3px);
}

/* ==========================================
   RIGHT - SIDEBAR
   ========================================== */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.sidebar-widget {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}

.widget-title {
  font-size: 1.1rem;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 8px;
}

.widget-title svg {
  width: 18px;
  height: 18px;
  fill: var(--accent-primary);
}

/* Tags cloud */
.tags-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.sidebar-tag {
  font-size: 0.8rem;
  font-weight: 500;
  padding: 6px 12px;
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.sidebar-tag:hover, .sidebar-tag.active {
  background: var(--accent-gradient);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}

/* Featured articles list */
.featured-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.featured-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.featured-item-img {
  width: 64px;
  height: 64px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  border: 1px solid var(--border-color);
}

.featured-item-content {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.featured-item-title {
  font-size: 0.88rem;
  font-weight: 600;
  line-height: 1.35;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  color: var(--text-primary);
}

.featured-item-title a:hover {
  color: var(--accent-primary);
}

.featured-item-date {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ==========================================
   USER REVIEWS / EVALUATION SECTION
   ========================================== */
.reviews-section {
  padding: 60px 0;
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.section-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 40px;
}

.section-title {
  font-size: 2rem;
  margin-bottom: 12px;
}

.section-subtitle {
  color: var(--text-muted);
  font-size: 1rem;
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: transform var(--transition-normal), border-color var(--transition-normal);
}

.review-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-primary);
}

.review-rating {
  color: var(--warning);
  display: flex;
  gap: 2px;
}

.review-rating svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.review-content {
  font-size: 0.92rem;
  color: var(--text-secondary);
  font-style: italic;
  line-height: 1.5;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: auto;
}

.author-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background-color: var(--accent-soft);
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
  border: 1px solid rgba(59, 130, 246, 0.1);
}

.author-info {
  display: flex;
  flex-direction: column;
}

.author-name {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

.author-role {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ==========================================
   FAQ (COMMON QUESTIONS) SECTION
   ========================================== */
.faq-section {
  padding: 60px 0 80px;
}

.faq-container {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-normal);
}

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

.faq-trigger {
  width: 100%;
  padding: 18px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  text-align: left;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
}

.faq-chevron {
  width: 20px;
  height: 20px;
  fill: var(--text-muted);
  transition: transform var(--transition-normal);
}

.faq-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal), padding var(--transition-normal);
  padding: 0 24px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  border-top: 1px solid transparent;
}

.faq-item.active {
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-md);
}

.faq-item.active .faq-chevron {
  transform: rotate(180deg);
  fill: var(--accent-primary);
}

.faq-item.active .faq-content {
  max-height: 300px; /* arbitrary height that easily holds the content */
  padding: 16px 24px 24px;
  border-top-color: var(--border-color);
}

/* ==========================================
   FOOTER
   ========================================== */
.footer {
  background-color: #0b0f19;
  color: #9ca3af;
  padding: 60px 0 24px;
  border-top: 1px solid #1f2937;
  font-size: 0.9rem;
}

.footer h3, .footer h4 {
  color: #f9fafb;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-brand-title {
  font-size: 1.35rem;
  font-weight: 800;
  font-family: 'Outfit', sans-serif;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.footer-links-col {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-links-title {
  font-size: 0.95rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-links-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-link {
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--accent-primary);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  border-top: 1px solid #1f2937;
  font-size: 0.8rem;
}

.footer-bottom-links {
  display: flex;
  gap: 16px;
}

/* ==========================================
   ARTICLE PAGE / CONTENT STYLES
   ========================================== */
.article-page {
  padding: 40px 0;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

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

.breadcrumbs svg {
  width: 12px;
  height: 12px;
  fill: currentColor;
}

.article-header {
  margin-bottom: 30px;
}

.article-title-large {
  font-size: 2.2rem;
  margin-bottom: 16px;
  line-height: 1.3;
}

.article-body {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

.article-body h2 {
  font-size: 1.5rem;
  margin: 32px 0 16px;
}

.article-body h3 {
  font-size: 1.25rem;
  margin: 24px 0 12px;
}

.article-body p {
  margin-bottom: 20px;
}

.article-body ul, .article-body ol {
  margin-bottom: 20px;
  padding-left: 20px;
}

.article-body ul {
  list-style: disc;
}

.article-body ol {
  list-style: decimal;
}

.article-body li {
  margin-bottom: 8px;
}

.article-body blockquote {
  border-left: 4px solid var(--accent-primary);
  background-color: var(--bg-tertiary);
  padding: 16px 20px;
  margin: 24px 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
  color: var(--text-primary);
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.95rem;
}

.article-body th, .article-body td {
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  text-align: left;
}

.article-body th {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  font-weight: 600;
}

.article-body tr:nth-child(even) td {
  background-color: rgba(0, 0, 0, 0.01);
}

[data-theme="dark"] .article-body tr:nth-child(even) td {
  background-color: rgba(255, 255, 255, 0.01);
}

.article-body img {
  border-radius: var(--radius-md);
  margin: 24px auto;
  border: 1px solid var(--border-color);
}

.article-navigation {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin-top: 40px;
  padding-top: 30px;
  border-top: 1px solid var(--border-color);
}

.article-nav-card {
  flex: 1;
  padding: 16px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.article-nav-card:hover {
  border-color: var(--accent-primary);
}

.article-nav-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-muted);
}

.article-nav-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Key features grid for landing page banner */
.core-features-section {
  padding: 40px 0 20px;
}

.core-features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.core-feature-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.core-feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-md);
}

.core-feature-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--accent-soft);
  color: var(--accent-primary);
  border-radius: var(--radius-md);
}

.core-feature-icon svg {
  width: 24px;
  height: 24px;
  fill: currentColor;
}

.core-feature-title {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.core-feature-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* ==========================================
   RESPONSIVE MEDIA QUERIES
   ========================================== */
@media (max-width: 1024px) {
  .main-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .core-features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }
  
  .hero-title {
    font-size: 2.2rem;
  }
  
  .menu-toggle {
    display: block;
  }
  
  .nav {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    padding: 16px 24px;
    align-items: stretch;
    box-shadow: var(--shadow-lg);
  }
  
  .nav.active {
    display: flex;
  }
  
  .nav-link {
    padding: 12px 16px;
  }
  
  .article-card {
    grid-template-columns: 1fr;
    gap: 0;
  }
  
  .card-image-wrap {
    height: 180px;
  }
  
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.8rem;
  }
  
  .core-features-grid {
    grid-template-columns: 1fr;
  }
}