:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --border: #e2e8f0;
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
  --primary: #61dafb;
  --primary-hover: #4fa8c7;
  --bg-primary: #0f0f0f;
  --bg-secondary: #1a1a1a;
  --bg-tertiary: #2a2a2a;
  --text-primary: #ffffff;
  --text-secondary: #e2e8f0;
  --text-muted: #94a3b8;
  --border: rgba(255, 255, 255, 0.08);
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: 280px;
  height: 100vh;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  padding: 1.5rem;
  overflow-y: auto;
  z-index: 1000;
  transform: translateX(-100%);
  transition: transform 0.3s ease;
}

.sidebar.active {
  transform: translateX(0);
}

.sidebar-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.sidebar-logo {
  width: 40px;
  height: 40px;
  border-radius: 6px;
}

.sidebar-header h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
}

.sidebar-nav {
  margin-bottom: 2rem;
}

.nav-link {
  display: block;
  padding: 0.75rem 1rem;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: 6px;
  margin-bottom: 0.25rem;
  transition: all 0.2s ease;
  font-size: 0.875rem;
}

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

.sidebar-stats {
  margin-bottom: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.sidebar-stats h4 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.sidebar-stat {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0;
}

.sidebar-stat .stat-number {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--primary);
}

.sidebar-stat .stat-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.sidebar-social h4 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

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

.social-link {
  display: block;
  padding: 0.5rem 0.75rem;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: 4px;
  transition: all 0.2s ease;
  font-size: 0.875rem;
}

.social-link:hover {
  background-color: var(--bg-tertiary);
  color: var(--primary);
}

.theme-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.75rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-primary);
  cursor: pointer;
  font-size: 0.875rem;
  margin-top: 1rem;
  transition: all 0.2s ease;
}

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

.mobile-menu-toggle {
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 1001;
  background: var(--primary);
  border: none;
  border-radius: 6px;
  padding: 0.75rem;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.mobile-menu-toggle span {
  width: 20px;
  height: 2px;
  background: white;
  transition: all 0.3s ease;
}

.mobile-menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

.main-content {
  margin-left: 0;
  padding: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.header {
  font-size: 2.5rem;
  color: var(--primary);
  text-align: center;
  margin-bottom: 1rem;
  font-weight: 700;
}

.subheader {
  color: var(--primary);
  font-size: 1.8rem;
  margin-bottom: 1rem;
  font-weight: 600;
}

.icon {
  width: 120px;
  height: 120px;
  display: block;
  margin: 0 auto 1rem;
  border-radius: 12px;
}

.image {
  width: 100%;
  max-width: 200px;
  border-radius: 8px;
  margin-bottom: 1rem;
}

.button {
  background: var(--primary);
  color: white;
  padding: 0.8rem 1.5rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 500;
  transition: all 0.2s ease;
  border: none;
  cursor: pointer;
  text-align: center;
  font-size: 0.95rem;
  display: inline-block;
}

.button:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

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

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin: 2rem 0;
}

.badge {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  padding: 0.5rem 1rem;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 500;
  display: inline-block;
  margin: 1rem 0;
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.link {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s ease;
  font-weight: 500;
}

.link:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

.project-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  transition: all 0.3s ease;
}

.project-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.team-member {
  text-align: center;
  background: var(--bg-tertiary);
  border-radius: 8px;
  padding: 1.5rem;
  border: 1px solid var(--border);
}

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

.team-member img {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  margin-bottom: 1rem;
  border: 2px solid var(--primary);
}

.team-member h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.team-member p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.team-bio {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin: 0.5rem 0 1rem 0;
  font-style: italic;
}

.faq-item {
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.faq-item h3 {
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  font-size: 1.125rem;
  font-weight: 600;
}

.faq-item:last-child {
  border-bottom: none;
}

.stats-section {
  background: var(--bg-tertiary);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 2rem;
  margin: 2rem 0;
}

.stat-item {
  text-align: center;
  padding: 1.5rem;
}

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 0.5rem;
  display: block;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.footer {
  background: var(--bg-tertiary);
  padding: 2rem;
  margin-top: 4rem;
  border-top: 1px solid var(--border);
}

.footer ul {
  list-style: none;
  padding: 0;
}

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

.footer h3 {
  color: var(--text-primary);
  margin-bottom: 1rem;
  font-weight: 600;
}

html {
  scroll-behavior: smooth;
}

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

ul {
  margin-left: 1.5rem;
  margin-bottom: 1rem;
}

li {
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

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

.animate {
  animation: fadeInUp 0.6s ease forwards;
}

@media (min-width: 1024px) {
  .sidebar {
    transform: translateX(0);
  }
  
  .main-content {
    margin-left: 280px;
  }
  
  .mobile-menu-toggle {
    display: none;
  }
}

@media (max-width: 768px) {
  .main-content {
    padding: 1rem;
  }

  .header {
    font-size: 2rem;
  }

  .subheader {
    font-size: 1.5rem;
  }

  .card,
  .project-card {
    padding: 1.5rem;
  }

  .grid,
  .projects-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

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

  .stat-number {
    font-size: 1.5rem;
  }
}

@media (max-width: 480px) {
  .header {
    font-size: 1.8rem;
  }

  .subheader {
    font-size: 1.3rem;
  }

  .card-content {
    font-size: 0.95rem;
  }

  .icon {
    width: 80px;
    height: 80px;
  }

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

  .stat-item {
    padding: 1rem;
  }
}