:root {
  --bg: #ffffff;
  --text: #1a1a1a;
  --muted: #5d5d5d;
  --link: #0b5c7a;
  --maxw: 72ch;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.6;
}

header, main, footer {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 1.5rem 1.25rem;
}

header {
  border-bottom: 1px solid #e5e5e5;
  padding: 0.75rem 1.25rem;
}

footer {
  border-top: 1px solid #e5e5e5;
  color: var(--muted);
  font-size: 0.95rem;
  text-align: center;
}

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

.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.header-lang {
  display: flex;
  justify-content: flex-end;
}

a {
  color: var(--link);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-title a {
  font-weight: 600;
  font-size: 1rem;
  color: var(--text);
}

.lang-switch {
  margin-top: 0;
  display: flex;
  gap: 0.75rem;
  font-size: 0.95rem;
}

.lang-switch .active {
  font-weight: 600;
}

.lang-switch .muted {
  color: var(--muted);
}

.lang-switch a.muted {
  color: var(--muted);
}

.lang-switch a.muted:hover {
  color: var(--muted);
}

main h1 {
  font-size: clamp(2.25rem, 4vw, 3rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin-top: 0.5rem;
  margin-bottom: 1.25rem;
}

main h2 {
  margin-top: 2rem;
  font-size: 1.35rem;
}

main ul {
  padding-left: 1.25rem;
}

@media (max-width: 640px) {
  header, main, footer {
    padding: 1.25rem 1rem;
  }

  header {
    padding: 0.75rem 1rem;
  }
}