body {
  margin: 0;
  font-family: system-ui, sans-serif;
  background: #f5f7fb;
  color: #111827;
}

.topbar {
  background: #ffffff;
  border-bottom: 1px solid #e5e7eb;
  position: sticky;
  top: 0;
}

.topbar-inner {
  max-width: 1200px;
  margin: auto;
  padding: 12px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-weight: 700;
  font-size: 1.3rem;
}

.logo span {
  color: #1f6feb;
}

.nav {
  display: flex;
  gap: 20px;
}

.nav a {
  text-decoration: none;
  color: #6b7280;
}

.nav a:hover {
  color: #1f6feb;
}

.dark-toggle {
  background: none;
  border: none;
  font-size: 1.3rem;
  cursor: pointer;
}

.hero {
  text-align: center;
  padding: 80px 16px;
  background: #ffffff;
  border-bottom: 1px solid #e5e7eb;
}

.hero h1 {
  font-size: 2.4rem;
}

.hero p {
  color: #6b7280;
  max-width: 600px;
  margin: auto;
}

.section {
  max-width: 1200px;
  margin: auto;
  padding: 60px 16px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.card {
  background: #ffffff;
  padding: 20px;
  border-radius: 12px;
  border: 1px solid #e5e7eb;
  box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}

.card-image {
  width: 100%;
  border-radius: 10px;
  margin-bottom: 10px;
}

.card h3 {
  margin-bottom: 10px;
}

.card p {
  color: #6b7280;
}

.footer {
  text-align: center;
  padding: 20px;
  color: #6b7280;
}

/* Animations */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeIn 0.8s ease forwards;
}

@keyframes fadeIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Dark Mode */
body.dark {
  background: #020617;
  color: #e5e7eb;
}

body.dark .card {
  background: #0b1120;
  border-color: #1f2937;
}

body.dark .nav a {
  color: #9ca3af;
}

body.dark .nav a:hover {
  color: #60a5fa;
}