:root {
  --ink: #023047;
  --ink-soft: rgba(2, 48, 71, 0.62);
  --cream: #f7fbfd;
  --accent: #219ebc;
  --sky: #8ecae6;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  color: var(--ink);
  background:
    linear-gradient(180deg, #c5e8f5 0%, var(--cream) 220px, var(--cream) 100%);
  line-height: 1.55;
}

a {
  color: var(--accent);
}

header,
main,
footer {
  width: min(720px, calc(100% - 2rem));
  margin-left: auto;
  margin-right: auto;
}

header {
  padding: 2rem 0 1rem;
}

.brand {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin: 0;
}

.brand span {
  color: var(--accent);
}

nav {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  font-size: 0.95rem;
}

nav a {
  text-decoration: none;
  font-weight: 600;
}

nav a[aria-current="page"] {
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

main {
  background: #fff;
  border-radius: 16px;
  padding: 1.5rem 1.35rem 2rem;
  box-shadow: 0 10px 30px rgba(2, 48, 71, 0.06);
  margin-bottom: 2rem;
}

h1 {
  margin: 0 0 0.35rem;
  font-size: 1.75rem;
  letter-spacing: -0.02em;
}

.updated {
  margin: 0 0 1.5rem;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

h2 {
  margin: 1.5rem 0 0.5rem;
  font-size: 1.05rem;
}

p,
li {
  margin: 0 0 0.85rem;
}

ul {
  margin: 0 0 1rem;
  padding-left: 1.2rem;
}

footer {
  padding: 0 0 2.5rem;
  color: var(--ink-soft);
  font-size: 0.9rem;
}