body {
  font-family: 'Inter', sans-serif;
  margin: 0;
  background: #f8fafc;
  color: #0f172a;
  line-height: 1.6;
  scroll-behavior: smooth;
}

header {
  padding: 80px 20px;
  text-align: center;
  background: linear-gradient(135deg, #e2e8f0, #ffffff);
}

header h1 {
  font-size: 3rem;
  margin-bottom: 10px;
  letter-spacing: -1px;
}

header p {
  color: #475569;
  font-size: 1.1rem;
}

nav {
  position: sticky;
  top: 0;
  background: rgba(255,255,255,0.9);
  backdrop-filter: blur(10px);
  padding: 12px;
  display: flex;
  justify-content: center;
  gap: 25px;
  border-bottom: 1px solid #e2e8f0;
  z-index: 100;
}

nav a {
  color: #1e293b;
  text-decoration: none;
  font-weight: 500;
  transition: all 0.2s ease;
}

nav a:hover {
  color: #2563eb;
  transform: translateY(-1px);
}

section {
  max-width: 900px;
  margin: 50px auto;
  padding: 0 20px;
}

h2 {
  border-left: 4px solid #2563eb;
  padding-left: 12px;
  margin-bottom: 20px;
  font-size: 1.6rem;
}

.card {
  background: #ffffff;
  padding: 22px;
  border-radius: 18px;
  margin-bottom: 20px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.08);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 15px 35px rgba(0,0,0,0.12);
}

ul {
  padding-left: 20px;
}

li {
  margin-bottom: 6px;
}

footer {
  text-align: center;
  padding: 40px;
  color: #475569;
  border-top: 1px solid #e2e8f0;
  margin-top: 60px;
  background: #ffffff;
}