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

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

nav {
  width: 100%;
  background: #f4f4ff;
  padding: 1rem;
}

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

.nav-header h4 {
  font-size: 1.8rem;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
}

.nav-links a {
  color: #000;
  text-decoration: none;
  font-size: 1.2rem;
}

.container {
  padding: 2rem;
  background-color: #f1f5f8;
  text-align: center;
  border-radius: 18px;
}

main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.container h2 {
  font-size: 1.8rem;
  padding: 1.5rem;
  background: #000;
  color: #fff;
  border-radius: 12px;
  margin-bottom: 1rem;
  width: 100%;
  max-width: 600px;
}

.container button {
  font-size: 1.5rem;
  padding: 1rem 2rem;
  color: #fff;
  background: hsl(240, 68%, 85%);
  border: 2px solid #000;
  border-radius: 12px;
  cursor: pointer;
  width: 100%;
  max-width: 400px;
}

/* RESPONSIVE TWEAKS */
@media (max-width: 768px) {
  .nav-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav-links {
    gap: 1rem;
    margin-top: 1rem;
  }

  .container h2, .container button {
    font-size: 1.2rem;
  }
}