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

:root {
  /* Colors */
  --color-violet-50: #f5f3ff;
  --color-violet-100: #ede9fe;
  --color-violet-200: #ddd6fe;
  --color-violet-300: #c4b5fd;
  --color-violet-400: #a78bfa;
  --color-violet-500: #8b5cf6;
  --color-violet-600: #7c3aed;
  --color-violet-700: #6d28d9;
  --color-violet-800: #5b21b6;
  --color-violet-900: #4c1d95;
  
  --color-purple-50: #faf5ff;
  --color-purple-100: #f3e8ff;
  --color-purple-200: #e9d5ff;
  --color-purple-300: #d8b4fe;
  --color-purple-400: #c084fc;
  --color-purple-500: #a855f7;
  --color-purple-600: #9333ea;
  --color-purple-700: #7e22ce;
  --color-purple-800: #6b21a8;
  --color-purple-900: #581c87;
  
  --color-gray-50: #fafafa;
  --color-gray-100: #f4f4f5;
  --color-gray-200: #e4e4e7;
  --color-gray-300: #d4d4d8;
  --color-gray-400: #a1a1aa;
  --color-gray-500: #71717a;
  --color-gray-600: #52525b;
  --color-gray-700: #3f3f46;
  --color-gray-800: #27272a;
  --color-gray-900: #18181b;
  
  --color-blue-50: #eff6ff;
  --color-blue-100: #dbeafe;
  --color-blue-200: #bfdbfe;
  --color-blue-300: #93c5fd;
  --color-blue-400: #60a5fa;
  --color-blue-500: #3b82f6;
  --color-blue-600: #2563eb;
  --color-blue-700: #1d4ed8;
  
  --color-green-500: #22c55e;
  --color-yellow-400: #facc15;
  --color-pink-600: #db2777;
  --color-cyan-600: #0891b2;
  
  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  
  /* Border Radius */
  --radius-sm: 0.125rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-2xl: 1rem;
  --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);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
  --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
}

/* Base Elements */
html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  color: var(--color-gray-900);
  background-color: white;
  min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-4);
}

h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.875rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1.125rem; }

@media (max-width: 768px) {
  h1 { font-size: 2.25rem; }
  h2 { font-size: 1.875rem; }
  h3 { font-size: 1.5rem; }
}

p {
  margin-bottom: var(--space-4);
  line-height: 1.75;
}

a {
  color: var(--color-violet-600);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-violet-700);
}

/* Layout Components */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

@media (min-width: 640px) {
  .container { padding: 0 var(--space-6); }
}

@media (min-width: 1024px) {
  .container { padding: 0 var(--space-8); }
}

/* Grid System */
.grid {
  display: grid;
  gap: var(--space-8);
}

.grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 768px) {
  .md\:grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
  .md\:grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 1024px) {
  .lg\:grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
  .lg\:grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
  .lg\:grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
}

/* Flexbox Utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-6);
  font-weight: 500;
  border-radius: var(--radius-lg);
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
  text-decoration: none;
  font-size: 1rem;
  line-height: 1.5;
}

.btn-primary {
  background: linear-gradient(to right, var(--color-violet-600), var(--color-purple-600));
  color: white;
}

.btn-primary:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-xl);
}

.btn-secondary {
  background-color: white;
  color: var(--color-gray-900);
  border: 1px solid var(--color-gray-200);
}

.btn-secondary:hover {
  box-shadow: var(--shadow-lg);
}

/* Cards */
.card {
  background-color: white;
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-lg);
  transition: all 0.3s ease;
}

.card:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-2px);
}

/* Glass Effect */
.glass {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

/* Gradient Text */
.gradient-text {
  background: linear-gradient(to right, var(--color-violet-600), var(--color-purple-600));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* Navigation */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-gray-200);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.nav-links {
  display: flex;
  gap: var(--space-8);
  list-style: none;
}

.nav-link {
  color: var(--color-gray-700);
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav-link:hover {
  color: var(--color-violet-600);
}

/* Mobile Menu */
.mobile-menu-button {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
}

@media (max-width: 768px) {
  .mobile-menu-button {
    display: block;
  }
  
  .nav-links {
    position: fixed;
    top: 4rem;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: var(--space-4);
    border-bottom: 1px solid var(--color-gray-200);
    transform: translateY(-100%);
    transition: transform 0.3s ease;
  }
  
  .nav-links.active {
    transform: translateY(0);
  }
}

/* Hero Section */
.hero {
  position: relative;
  min-height: 90vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom right, var(--color-purple-50), white, var(--color-blue-50));
}

.hero-shapes {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.hero-shape {
  position: absolute;
  width: 24rem;
  height: 24rem;
  background: linear-gradient(to bottom right, rgba(124, 58, 237, 0.2), rgba(147, 51, 234, 0.2));
  border-radius: 50%;
  filter: blur(48px);
}

/* Feature Cards */
.feature-card {
  background-color: white;
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-lg);
  transition: all 0.3s ease;
}

.feature-card:hover {
  box-shadow: var(--shadow-xl);
}

.feature-icon {
  width: 3.5rem;
  height: 3.5rem;
  background: linear-gradient(to bottom right, var(--color-violet-100), var(--color-purple-100));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-4);
  transition: transform 0.3s ease;
}

.feature-card:hover .feature-icon {
  transform: scale(1.1);
}

/* Stats */
.stat-card {
  text-align: center;
  padding: var(--space-6);
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  border-radius: var(--radius-2xl);
  transition: transform 0.3s ease;
}

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

.stat-value {
  font-size: 3rem;
  font-weight: 700;
  color: white;
  margin-bottom: var(--space-2);
}

.stat-label {
  color: rgba(255, 255, 255, 0.8);
}

/* Footer */
.footer {
  background-color: var(--color-gray-900);
  color: white;
  padding: var(--space-16) 0 var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

.footer-heading {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-4);
}

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

.footer-link {
  color: var(--color-gray-400);
  display: block;
  padding: var(--space-2) 0;
  transition: color 0.2s ease;
}

.footer-link:hover {
  color: white;
}

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

.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-medium { font-weight: 500; }

.text-sm { font-size: 0.875rem; }
.text-base { font-size: 1rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }
.text-2xl { font-size: 1.5rem; }
.text-3xl { font-size: 1.875rem; }
.text-4xl { font-size: 2.25rem; }
.text-5xl { font-size: 3rem; }

.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-12 { margin-bottom: var(--space-12); }

.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }

.py-4 { padding-top: var(--space-4); padding-bottom: var(--space-4); }
.py-8 { padding-top: var(--space-8); padding-bottom: var(--space-8); }
.py-12 { padding-top: var(--space-12); padding-bottom: var(--space-12); }
.py-16 { padding-top: var(--space-16); padding-bottom: var(--space-16); }
.py-20 { padding-top: var(--space-20); padding-bottom: var(--space-20); }
.py-24 { padding-top: var(--space-24); padding-bottom: var(--space-24); }

.px-4 { padding-left: var(--space-4); padding-right: var(--space-4); }
.px-6 { padding-left: var(--space-6); padding-right: var(--space-6); }
.px-8 { padding-left: var(--space-8); padding-right: var(--space-8); }

.bg-gray-50 { background-color: var(--color-gray-50); }
.bg-gray-100 { background-color: var(--color-gray-100); }
.bg-gray-200 { background-color: var(--color-gray-200); }
.bg-gray-900 { background-color: var(--color-gray-900); }

.text-gray-400 { color: var(--color-gray-400); }
.text-gray-500 { color: var(--color-gray-500); }
.text-gray-600 { color: var(--color-gray-600); }
.text-gray-700 { color: var(--color-gray-700); }
.text-gray-900 { color: var(--color-gray-900); }
.text-white { color: white; }

.border { border: 1px solid var(--color-gray-200); }
.border-gray-200 { border-color: var(--color-gray-200); }
.border-white-20 { border-color: rgba(255, 255, 255, 0.2); }

.rounded { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-2xl { border-radius: var(--radius-2xl); }
.rounded-full { border-radius: var(--radius-full); }

.shadow { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }

.overflow-hidden { overflow: hidden; }
.relative { position: relative; }
.absolute { position: absolute; }
.inset-0 { top: 0; right: 0; bottom: 0; left: 0; }

.z-10 { z-index: 10; }
.z-20 { z-index: 20; }
.z-50 { z-index: 50; }

/* Animations */
@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

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

@keyframes scale-in {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.animate-fade-in {
  animation: fade-in 0.6s ease-out;
}

.animate-fade-up {
  animation: fade-up 0.6s ease-out;
}

.animate-scale-in {
  animation: scale-in 0.6s ease-out;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-gray-100);
}

::-webkit-scrollbar-thumb {
  background: var(--color-gray-400);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-gray-500);
}

/* Loading Spinner */
.spinner {
  display: inline-block;
  width: 2rem;
  height: 2rem;
  border: 3px solid var(--color-gray-200);
  border-radius: 50%;
  border-top-color: var(--color-violet-600);
  animation: spinner 0.8s linear infinite;
}

@keyframes spinner {
  to { transform: rotate(360deg); }
}

/* Article Styles */
.article-content {
  max-width: 65ch;
  margin: 0 auto;
  line-height: 1.8;
}

.article-content h2 {
  margin-top: var(--space-12);
  margin-bottom: var(--space-6);
  color: var(--color-gray-900);
  font-size: 1.875rem;
  font-weight: 700;
}

.article-content h3 {
  margin-top: var(--space-8);
  margin-bottom: var(--space-4);
  color: var(--color-gray-800);
  font-size: 1.5rem;
  font-weight: 600;
}

.article-content ul,
.article-content ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}

.article-content li {
  margin-bottom: var(--space-2);
}

.article-content blockquote {
  margin: var(--space-8) 0;
  padding-left: var(--space-4);
  border-left: 4px solid var(--color-violet-600);
  font-style: italic;
  color: var(--color-gray-700);
}

/* Content Sections */
.intro-paragraph {
  font-size: 1.125rem;
  line-height: 1.75;
  color: var(--color-gray-700);
  margin-bottom: var(--space-8);
  padding: var(--space-6);
  background: var(--color-gray-50);
  border-radius: 0.5rem;
}

.quick-overview {
  margin: var(--space-8) 0;
  padding: var(--space-6);
  background: linear-gradient(to right, var(--color-violet-50), var(--color-purple-50));
  border-radius: 0.5rem;
}

.quick-overview h2 {
  margin-top: 0;
  margin-bottom: var(--space-4);
  color: var(--color-violet-900);
}

.overview-list {
  list-style: none;
  padding: 0;
}

.overview-list li {
  position: relative;
  padding-left: var(--space-8);
  margin-bottom: var(--space-3);
  color: var(--color-gray-700);
}

.overview-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  width: 1.5rem;
  height: 1.5rem;
  background: var(--color-violet-600);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 0.875rem;
}

.content-section {
  margin: var(--space-12) 0;
}

.section-content {
  margin-bottom: var(--space-6);
  color: var(--color-gray-700);
  line-height: 1.75;
}

/* Data Visualizations */
.data-visualization {
  margin: var(--space-8) 0;
  padding: var(--space-6);
  background: var(--color-gray-50);
  border-radius: 0.5rem;
  text-align: center;
}

.data-visualization svg {
  max-width: 100%;
  height: auto;
  margin: 0 auto;
}

/* Links within content */
.internal-links,
.external-links {
  margin: var(--space-6) 0;
  padding: var(--space-4);
  background: var(--color-gray-50);
  border-radius: 0.5rem;
}

.internal-links h3,
.external-links h3 {
  font-size: 1rem;
  margin-bottom: var(--space-2);
  color: var(--color-gray-700);
}

.internal-links ul,
.external-links ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.internal-links li,
.external-links li {
  margin-bottom: var(--space-2);
}

.internal-link,
.external-link {
  color: var(--color-violet-600);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: all 0.2s;
}

.internal-link:hover,
.external-link:hover {
  color: var(--color-violet-700);
  border-bottom-color: var(--color-violet-600);
}

.external-link::after {
  content: " ↗";
  font-size: 0.875em;
  opacity: 0.7;
}

/* Conclusion */
.conclusion {
  margin-top: var(--space-12);
  padding: var(--space-6);
  background: linear-gradient(to bottom, var(--color-violet-50), transparent);
  border-radius: 0.5rem;
}

.conclusion h2 {
  color: var(--color-violet-900);
  margin-top: 0;
}

/* EEAT Author Box */
.author-box {
  background-color: var(--color-gray-50);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  margin: var(--space-12) 0;
}

.author-info {
  display: flex;
  gap: var(--space-6);
  align-items: flex-start;
}

.author-image {
  width: 6rem;
  height: 6rem;
  border-radius: var(--radius-full);
  object-fit: cover;
}

.author-details h3 {
  margin-bottom: var(--space-2);
}

.author-title {
  color: var(--color-gray-600);
  margin-bottom: var(--space-4);
}

/* Data Visualization */
.data-viz {
  margin: var(--space-8) 0;
  padding: var(--space-6);
  background-color: var(--color-gray-50);
  border-radius: var(--radius-xl);
}

.data-viz svg {
  max-width: 100%;
  height: auto;
}

/* Responsive Tables */
.table-container {
  overflow-x: auto;
  margin: var(--space-4) 0;
}

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

th, td {
  text-align: left;
  padding: var(--space-3);
  border-bottom: 1px solid var(--color-gray-200);
}

th {
  font-weight: 600;
  background-color: var(--color-gray-50);
}

/* Breadcrumbs */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
  font-size: 0.875rem;
}

.breadcrumb-separator {
  color: var(--color-gray-400);
}

.breadcrumb-link {
  color: var(--color-gray-600);
}

.breadcrumb-link:hover {
  color: var(--color-violet-600);
}

.breadcrumb-current {
  color: var(--color-gray-900);
  font-weight: 500;
}

/* Breadcrumb Navigation */
.breadcrumb {
  padding: 0.75rem 0;
  margin-bottom: 1.5rem;
  font-size: 0.875rem;
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 0.5rem;
}

.breadcrumb-item {
  display: flex;
  align-items: center;
}

.breadcrumb-item:not(:last-child)::after {
  content: '/';
  margin-left: 0.5rem;
  color: var(--color-gray-400);
}

.breadcrumb-item a {
  color: var(--color-violet-600);
  text-decoration: none;
  transition: color 0.2s;
}

.breadcrumb-item a:hover {
  color: var(--color-violet-700);
  text-decoration: underline;
}

.breadcrumb-item.active {
  color: var(--color-gray-600);
}

/* Related Articles Section */
.related-articles {
  margin-top: 4rem;
  padding-top: 3rem;
  border-top: 1px solid var(--color-gray-200);
}

.related-articles h2 {
  font-size: 1.875rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--color-gray-900);
}

.related-articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.related-article-card {
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  background: white;
  border: 1px solid var(--color-gray-200);
  border-radius: 0.5rem;
  text-decoration: none;
  transition: all 0.2s;
}

.related-article-card:hover {
  border-color: var(--color-violet-300);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
}

.related-article-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-gray-900);
  margin: 0 0 0.5rem 0;
}

.related-article-card .read-more {
  color: var(--color-violet-600);
  font-size: 0.875rem;
  font-weight: 500;
  margin-top: auto;
}

/* FAQ Schema Content (hidden, for SEO only) */
.faq-schema-content {
  display: none;
}