:root {
  --primary-gradient: linear-gradient(135deg, #ffffff 0%, #a855f7 50%, #06b6d4 100%);
  --secondary-gradient: #06b6d4;
  --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --success-gradient: linear-gradient(135deg, #4ade80 0%, #22c55e 100%);
  --warning-gradient: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
  --dark-bg: #0a0a0a;
  --card-bg: rgba(255, 255, 255, 0.05);
  --text-primary: #ffffff;
  --text-secondary: #b3b3b3;
  --border-color: rgba(255, 255, 255, 0.1);
  --shadow-primary: 0 20px 40px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 30px 60px rgba(0, 0, 0, 0.4);
}

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

body {
  font-family: "Inter", sans-serif;
  background: var(--dark-bg);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: var(--bg-nav);
  backdrop-filter: blur(20px);
  z-index: 1000;
  /* padding: 1rem 0; */
  transition: all 0.3s ease;
}

.navbar.scrolled {
  background: var(--bg-nav);
  box-shadow: 0 2px 27px rgb(0 0 0 / 20%);
}


.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 2rem;
}

.logo {
  font-size: 1.8rem;
  font-weight: 800;
  background: var(--primary-gradient);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-decoration: none;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: all 0.3s ease;
  position: relative;
}

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

.nav-link::after {
  content: "";
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-gradient);
  transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

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

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* Breadcrumb */
.breadcrumb {
  padding: 2rem;
  background: radial-gradient(
    ellipse at center,
    rgba(102, 126, 234, 0.05) 0%,
    transparent 70%
  );
}

.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.breadcrumb-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

.breadcrumb-separator {
  color: var(--text-secondary);
}

/* Article Header */
.article-header {
  padding: 2rem 0 3rem;
  text-align: left;
  position: relative;
}

.article-category {
  display: inline-block;
  background: var(--primary-gradient);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 25px;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

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

.article-subtitle {
  font-size: 1.3rem;
  color: var(--text-secondary);
  /* max-width: 800px; */
  margin: 0 auto 2rem;
  line-height: 1.5;
}

.article-meta {
  display: flex;
  justify-content: start;
  align-items: center;
  gap: 2rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  flex-wrap: wrap;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.author-avatar {
  width: 40px;
  height: 40px;
  background: var(--primary-gradient);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
}

/* Article Content */
.article-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 4rem;
  margin-bottom: 4rem;
}

.article-content {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 3rem;
  backdrop-filter: blur(20px);
  position: relative;
  overflow: hidden;
}

.article-content::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--primary-gradient);
}

.featured-image {
  width: 100%;
  height: 400px;
  background: linear-gradient(
    135deg,
    rgba(102, 126, 234, 0.3) 0%,
    rgba(118, 75, 162, 0.3) 100%
  );
  border-radius: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  color: var(--text-primary);
  margin-bottom: 2rem;
  position: relative;
  overflow: hidden;
}

.featured-image::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
  opacity: 0.3;
}

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

.article-body h2 {
  font-size: 1.8rem;
  font-weight: 700;
  margin: 2.5rem 0 1rem;
  background: var(--primary-gradient);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.article-body h3 {
  font-size: 1.4rem;
  font-weight: 600;
  margin: 2rem 0 1rem;
  color: var(--text-primary);
}

.article-body p {
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

.article-body ul,
.article-body ol {
  margin: 1.5rem 0;
  padding-left: 2rem;
}

.article-body li {
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.highlight-box {
  background: linear-gradient(
    135deg,
    rgba(102, 126, 234, 0.1) 0%,
    rgba(118, 75, 162, 0.1) 100%
  );
  border: 1px solid rgba(102, 126, 234, 0.3);
  border-radius: 15px;
  padding: 2rem;
  margin: 2rem 0;
  position: relative;
}

.highlight-box::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--primary-gradient);
  border-radius: 2px;
}

.highlight-box h4 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.stat-item {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 15px;
  padding: 1.5rem;
  text-align: center;
  backdrop-filter: blur(20px);
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  background: var(--success-gradient);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: block;
  margin-bottom: 0.5rem;
}

.stat-label {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
}

/* Sidebar */
.article-sidebar {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.sidebar-widget {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 2rem;
  backdrop-filter: blur(20px);
}

.widget-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  background: var(--primary-gradient);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.share-buttons {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.share-btn {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  background: transparent;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all 0.3s ease;
  font-weight: 500;
}

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

.toc-list {
  list-style: none;
}

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

.toc-list a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.3s ease;
  display: block;
  padding: 0.5rem 0;
  border-bottom: 1px solid transparent;
}

.toc-list a:hover {
  color: var(--text-primary);
  border-bottom-color: var(--border-color);
}

.key-points {
  list-style: none;
}

.key-points li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 1rem;
  padding: 0.75rem;
  background: rgba(102, 126, 234, 0.1);
  border-radius: 10px;
}

.key-points li::before {
  content: "✓";
  color: #4ade80;
  font-weight: bold;
  font-size: 1.1rem;
  flex-shrink: 0;
}

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

.section-title {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 2rem;
  background: var(--primary-gradient);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.related-article {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 15px;
  padding: 1.5rem;
  backdrop-filter: blur(20px);
  transition: all 0.3s ease;
  text-decoration: none;
  color: inherit;
}

.related-article:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(102, 126, 234, 0.3);
}

.related-article .article-category {
  font-size: 0.8rem;
  padding: 0.25rem 0.75rem;
  margin-bottom: 1rem;
}

.related-article h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
  line-height: 1.4;
}

.related-article p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.related-article .article-meta {
  justify-content: flex-start;
  gap: 1rem;
  font-size: 0.8rem;
}

/* CTA Section */
.article-cta {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 3rem;
  text-align: center;
  margin: 3rem 0;
  backdrop-filter: blur(20px);
  position: relative;
  overflow: hidden;
}

.article-cta::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--primary-gradient);
}

.cta-title {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 1rem;
  background: var(--primary-gradient);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.cta-text {
  color: var(--text-secondary);
  margin-bottom: 2rem;
  font-size: 1.1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 2rem;
  border-radius: 25px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
  font-size: 1rem;
}

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

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

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--primary-gradient);
  border-color: transparent;
}

/* Footer */
.footer {
  background: var(--bg-nav);
  padding: 3rem 0 1rem;
  border-top: 1px solid var(--border-color);
  margin-top: 4rem;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.footer-section h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 1rem;
  background: var(--primary-gradient);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

.footer-section ul li {
  margin-bottom: 0.5rem;
}

.footer-section ul li a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer-section ul li a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  margin-top: 2rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-secondary);
}

/* Responsive Design */
@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: block;
  }

  .nav-menu {
    position: fixed;
    top: 100%;
    left: 0;
    width: 100%;
    background: rgba(10, 10, 10, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 2rem;
    gap: 1rem;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
  }

  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .article-title {
    font-size: 2rem;
  }

  .article-layout {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .article-content {
    padding: 2rem;
  }

  .article-meta {
    gap: 1rem;
    justify-content: flex-start;
  }

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

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

  .article-cta {
    padding: 2rem;
  }
}

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

.animate-fade-in {
  animation: fadeInUp 0.8s ease-out;
}

/* Scroll Progress */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: var(--primary-gradient);
  z-index: 1001;
  transition: width 0.3s ease;
}