* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Arial, sans-serif;
  color: #143042;
  background: #eefaff;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 8vw;
  background: #ffffff;
  border-bottom: 1px solid #c8e7f0;
}

.brand {
  color: #0878a8;
  font-size: 22px;
  font-weight: 700;
  text-decoration: none;
}

.nav {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.nav a {
  color: #143042;
  font-weight: 600;
  text-decoration: none;
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: #0878a8;
}

.page {
  display: grid;
  min-height: calc(100vh - 65px);
  place-items: center;
  padding: 40px 8vw;
}

.content {
  width: min(640px, 100%);
  padding: 32px;
  background: #ffffff;
  border: 1px solid #c8e7f0;
  border-radius: 8px;
  box-shadow: 0 16px 36px rgba(8, 120, 168, 0.12);
}

h1 {
  margin: 0 0 14px;
  color: #0878a8;
  font-size: 34px;
  line-height: 1.15;
}

p {
  margin: 0;
  font-size: 18px;
  line-height: 1.7;
}

@media (max-width: 640px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .content {
    padding: 24px;
  }

  h1 {
    font-size: 28px;
  }
}