/* style.css */
* {
  margin: 0; padding: 0; box-sizing: border-box;
}
body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #fff;
  color: #0a3d62;
  line-height: 1.6;
  scroll-behavior: smooth;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a {
  text-decoration: none;
  color: inherit;
}

/* Navbar */
header {
  position: fixed;
  width: 100%;
  background: #f0f4f8;
  border-bottom: 1px solid #d1d9e6;
  z-index: 1000;
}
nav {
  max-width: 1100px;
  margin: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
}
nav .logo {
  font-weight: 700;
  font-size: 1.5rem;
  color: #05386b;
  letter-spacing: 1.2px;
}
nav ul {
  list-style: none;
  display: flex;
  gap: 2rem;
}
nav ul li a {
  font-weight: 600;
  font-size: 1rem;
  padding: 0.3rem 0.6rem;
  border-radius: 3px;
  transition: background-color 0.3s ease;
}
nav ul li a:hover, nav ul li a.active {
  background-color: #379683;
  color: white;
}

/* Main container */
main {
  max-width: 1100px;
  margin: 100px auto 60px; /* top margin to offset fixed header */
  padding: 0 20px;
  flex-grow: 1;
}

/* Section titles */
h1, h2 {
  color: #05668d;
}
h1 {
  font-size: 2.8rem;
  font-weight: 900;
  margin-bottom: 1rem;
}
h2 {
  font-weight: 800;
  margin-bottom: 1rem;
  font-size: 2rem;
  border-left: 5px solid #379683;
  padding-left: 10px;
}

/* Buttons */
.btn-primary {
  background-color: #379683;
  color: white;
  padding: 0.75rem 1.8rem;
  font-weight: 700;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.3s ease;
  display: inline-block;
}
.btn-primary:hover {
  background-color: #05668d;
}

/* Responsive */
@media (max-width: 768px) {
  nav ul {
    gap: 1rem;
  }
  h1 {
    font-size: 2rem;
  }
}
@media (max-width: 480px) {
  nav {
    flex-wrap: wrap;
    gap: 1rem;
  }
  main {
    margin: 120px 10px 40px;
  }
}