:root {
  /* Blue Theme Colors */
  --primary: #1e40af;
  --primary-light: #3b82f6;
  --primary-dark: #1e3a8a;
  --secondary: #0ea5e9;
  --secondary-light: #38bdf8;
  --accent: #06b6d4;
  --accent-light: #22d3ee;
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;

  --dark: #0f172a;
  --dark-light: #1e293b;
  --dark-lighter: #334155;
  --light: #ffffff;
  --light-gray: #f8fafc;
  --gray: #64748b;
  --gray-light: #94a3b8;

  --gradient-primary: linear-gradient(135deg, var(--primary), var(--secondary));
  --gradient-secondary: linear-gradient(135deg, var(--secondary), var(--accent));
  --gradient-hero: linear-gradient(135deg, var(--primary-dark), var(--primary), var(--secondary));

  --font-primary: "Inter", sans-serif;
  --font-display: "Poppins", sans-serif;

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

  --transition: all 0.3s ease;
  --border-radius: 0.75rem;
  --border-radius-lg: 1rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  background: var(--dark);
  color: var(--light);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Background Animation */
.bg-animated {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(-45deg, var(--dark), var(--dark-light), var(--primary-dark), var(--dark-lighter));
  background-size: 400% 400%;
  animation: gradientShift 15s ease infinite;
  z-index: -1;
}

@keyframes gradientShift {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1rem 2rem;
  transition: var(--transition);
  backdrop-filter: blur(10px);
}

.header.scrolled {
  background: rgba(15, 23, 42, 0.9);
  border-bottom: 1px solid rgba(59, 130, 246, 0.2);
  box-shadow: var(--shadow-lg);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  transition: var(--transition);
}

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

.logo-icon {
  width: 2.5rem;
  height: 2.5rem;
  background: var(--gradient-primary);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: white;
}

.logo-text {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.25rem;
  color: var(--light);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Language Selector */
.language-selector {
  position: relative;
}

.language-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: var(--border-radius);
  color: var(--light);
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font-primary);
  font-size: 0.875rem;
}

.language-btn:hover {
  background: rgba(59, 130, 246, 0.2);
  transform: translateY(-1px);
}

.language-flag {
  width: 1rem;
  height: 1rem;
  border-radius: 0.25rem;
  object-fit: cover;
}

.language-dropdown {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  min-width: 10rem;
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: var(--border-radius-lg);
  padding: 0.5rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: var(--transition);
  box-shadow: var(--shadow-xl);
  z-index: 1001;
}

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

.language-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: var(--transition);
  color: var(--light);
  font-size: 0.875rem;
}

.language-item:hover {
  background: rgba(59, 130, 246, 0.2);
}

/* Auth Buttons */
.auth-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius);
  font-family: var(--font-primary);
  font-weight: 500;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: var(--transition);
}

.login-btn {
  background: rgba(255, 255, 255, 0.1);
  color: var(--light);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.login-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-1px);
}

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

.signup-btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
  filter: brightness(1.1);
}

/* User Profile */
.user-profile {
  position: relative;
  display: none;
}

.user-profile.active {
  display: block;
}

.user-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem;
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: var(--transition);
}

.user-btn:hover {
  background: rgba(59, 130, 246, 0.2);
}

.user-avatar {
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  color: white;
  font-size: 0.75rem;
}

.user-info h4 {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--light);
}

.user-info p {
  font-size: 0.625rem;
  color: var(--gray-light);
}

.user-dropdown {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  min-width: 12rem;
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: var(--border-radius-lg);
  padding: 0.5rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: var(--transition);
  box-shadow: var(--shadow-xl);
  z-index: 1001;
}

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

.user-menu-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem;
  border-radius: var(--border-radius);
  color: var(--light);
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  background: none;
  font-family: var(--font-primary);
  font-size: 0.875rem;
  width: 100%;
  text-align: left;
}

.user-menu-item:hover {
  background: rgba(59, 130, 246, 0.2);
}

.user-menu-item.danger {
  color: var(--error);
}

.user-menu-item.danger:hover {
  background: rgba(239, 68, 68, 0.1);
}

/* Welcome Message */
.welcome-message {
  position: fixed;
  top: 5rem;
  left: 50%;
  transform: translateX(-50%);
  max-width: 500px;
  padding: 1rem 1.5rem;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: var(--border-radius-lg);
  backdrop-filter: blur(10px);
  text-align: center;
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transform: translateX(-50%) translateY(-20px);
  transition: var(--transition);
}

.welcome-message.active {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.welcome-title {
  font-weight: 600;
  color: var(--success);
  margin-bottom: 0.25rem;
  font-size: 0.875rem;
}

.welcome-text {
  font-size: 0.75rem;
  color: var(--light);
}

/* Main Content */
.main {
  padding-top: 4rem;
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
  position: relative;
}

.hero-content {
  max-width: 1000px;
  z-index: 2;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: 2rem;
  font-size: 0.875rem;
  color: var(--primary-light);
  margin-bottom: 2rem;
  animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--gray-light);
  margin-bottom: 2rem;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
  animation: fadeInUp 0.8s ease 0.6s both;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease 0.8s both;
}

.cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-primary);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  border-radius: var(--border-radius-lg);
  transition: var(--transition);
  cursor: pointer;
  border: none;
}

.cta-primary {
  background: var(--gradient-primary);
  color: white;
}

.cta-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
  filter: brightness(1.1);
}

.cta-secondary {
  background: rgba(255, 255, 255, 0.1);
  color: var(--light);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.cta-secondary:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

/* Stats Section */
.stats {
  padding: 4rem 2rem;
  background: rgba(59, 130, 246, 0.05);
  border-top: 1px solid rgba(59, 130, 246, 0.1);
  border-bottom: 1px solid rgba(59, 130, 246, 0.1);
}

.stats-container {
  max-width: 1000px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
}

.stat-item {
  text-align: center;
  padding: 1.5rem;
  border-radius: var(--border-radius-lg);
  transition: var(--transition);
}

.stat-item:hover {
  transform: translateY(-5px);
  background: rgba(59, 130, 246, 0.1);
}

.stat-number {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 0.5rem;
  display: block;
}

.stat-label {
  font-size: 1rem;
  color: var(--light);
  font-weight: 500;
}

.stat-description {
  font-size: 0.875rem;
  color: var(--gray-light);
  margin-top: 0.25rem;
}

/* Features Section */
.features {
  padding: 4rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-badge {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: 2rem;
  font-size: 0.875rem;
  color: var(--primary-light);
  margin-bottom: 1rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--gray-light);
  max-width: 600px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-top: 3rem;
}

.feature-card {
  padding: 1.5rem;
  background: rgba(59, 130, 246, 0.05);
  border: 1px solid rgba(59, 130, 246, 0.1);
  border-radius: var(--border-radius-lg);
  transition: var(--transition);
  cursor: pointer;
}

.feature-card:hover {
  transform: translateY(-5px);
  background: rgba(59, 130, 246, 0.1);
  border-color: rgba(59, 130, 246, 0.3);
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  width: 3rem;
  height: 3rem;
  background: var(--gradient-primary);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  font-size: 1.25rem;
  color: white;
  transition: var(--transition);
}

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

.feature-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--light);
  margin-bottom: 0.75rem;
}

.feature-description {
  color: var(--gray-light);
  line-height: 1.6;
  font-size: 0.9rem;
}

/* Articles Section */
.articles {
  padding: 4rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 1.5rem;
  margin-top: 3rem;
}

.article-card {
  background: rgba(59, 130, 246, 0.05);
  border: 1px solid rgba(59, 130, 246, 0.1);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}

.article-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(59, 130, 246, 0.3);
}

.article-image {
  width: 100%;
  height: 10rem;
  object-fit: cover;
  transition: var(--transition);
}

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

.article-content {
  padding: 1.5rem;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
  font-size: 0.75rem;
  color: var(--gray-light);
}

.article-category {
  padding: 0.25rem 0.5rem;
  background: rgba(59, 130, 246, 0.2);
  border-radius: 1rem;
  color: var(--primary-light);
  font-size: 0.625rem;
  font-weight: 500;
}

.article-title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--light);
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.article-excerpt {
  color: var(--gray-light);
  line-height: 1.6;
  margin-bottom: 1rem;
  font-size: 0.875rem;
}

.article-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--primary-light);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
  font-size: 0.875rem;
}

.article-link:hover {
  color: var(--primary);
  transform: translateX(4px);
}

/* Footer */
.footer {
  background: rgba(59, 130, 246, 0.05);
  border-top: 1px solid rgba(59, 130, 246, 0.1);
  padding: 3rem 2rem 1.5rem;
}

.footer-content {
  max-width: 1000px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-section h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--light);
  margin-bottom: 1rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-link {
  color: var(--gray-light);
  text-decoration: none;
  transition: var(--transition);
  font-size: 0.875rem;
}

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

.footer-bottom {
  border-top: 1px solid rgba(59, 130, 246, 0.1);
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-copyright {
  color: var(--gray-light);
  font-size: 0.75rem;
}

.social-links {
  display: flex;
  gap: 0.75rem;
}

.social-link {
  width: 2rem;
  height: 2rem;
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--light);
  text-decoration: none;
  transition: var(--transition);
  font-size: 0.875rem;
}

.social-link:hover {
  background: var(--gradient-primary);
  transform: translateY(-2px);
}

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

.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s ease;
}

.animate-on-scroll.animated {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive Design */
@media (max-width: 768px) {
  .header-content {
    padding: 0 1rem;
  }

  .hero {
    padding: 1rem;
    min-height: 90vh;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .cta-btn {
    width: 100%;
    max-width: 250px;
    justify-content: center;
  }

  .features-grid,
  .articles-grid {
    grid-template-columns: 1fr;
  }

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

  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

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

  .stat-number {
    font-size: 2rem;
  }
}