:root {
  color-scheme: light;
  font-family: "Inter", "Segoe UI", -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --accent: #0ea5e9;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

header {
  background: #0f172a;
  color: #fff;
  padding: 1.5rem 1rem;
}

header .wrap {
  max-width: 780px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

@media (min-width: 640px) {
  header .wrap {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.brand {
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

nav a {
  color: #bae6fd;
  text-decoration: none;
  font-weight: 600;
  margin-right: 1.5rem;
}

nav a:last-child {
  margin-right: 0;
}

nav a:hover {
  color: #fff;
}

main {
  max-width: 780px;
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
}

article {
  background: var(--card);
  padding: 2.5rem;
  border-radius: 18px;
  box-shadow: 0 25px 60px rgba(15, 23, 42, 0.08);
}

h1 {
  margin-top: 0;
  font-size: 2.2rem;
}

h2 {
  margin-top: 2rem;
  font-size: 1.4rem;
}

ul {
  padding-left: 1.25rem;
}

.section-meta {
  color: var(--muted);
  font-size: 0.95rem;
}

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

a:hover {
  color: #0284c7;
}

footer {
  text-align: center;
  padding: 2rem 1rem 3rem;
  color: var(--muted);
  font-size: 0.95rem;
}