:root {
  color-scheme: light dark;
  --ink: #16232a;
  --paper: #f7f5f1;
  --muted: #5b6b73;
  --accent: #2a6d78;
  --rule: #d9d4ca;
  --max-width: 40rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #eef2f3;
    --paper: #101a1e;
    --muted: #9aabb2;
    --accent: #6fc2cc;
    --rule: #2a373d;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, "SF Pro Text", "Segoe UI", system-ui, sans-serif;
  line-height: 1.55;
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3.5rem 1.5rem 4rem;
}

h1 {
  font-size: 1.75rem;
  margin: 0 0 0.5rem;
}

h2 {
  font-size: 1.1rem;
  margin: 2.25rem 0 0.5rem;
}

p { margin: 0.75rem 0; }

.tagline {
  color: var(--muted);
  font-size: 1.05rem;
  margin-top: 0;
}

.mark {
  display: block;
  width: 4.5rem;
  height: 4.5rem;
  border-radius: 22.5%;
  overflow: hidden;
  margin-bottom: 1.5rem;
}

.store-note {
  display: inline-block;
  margin-top: 1.5rem;
  padding: 0.6rem 1.1rem;
  border: 1px solid var(--rule);
  border-radius: 0.6rem;
  color: var(--muted);
  font-size: 0.95rem;
}

footer {
  margin-top: 3rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.9rem;
}

footer a { color: var(--accent); }
footer a + a { margin-left: 1rem; }

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

dt {
  font-weight: 600;
  margin-top: 1rem;
}

dd {
  margin: 0.15rem 0 0;
  color: var(--muted);
}

.back {
  display: inline-block;
  margin-bottom: 2rem;
  font-size: 0.9rem;
}

.lang-switch {
  position: fixed;
  top: 1rem;
  right: 1rem;
  display: flex;
  gap: 0.25rem;
  z-index: 1;
}

.lang-switch a,
.lang-switch .current {
  font-size: 0.8rem;
  text-decoration: none;
  border: 1px solid var(--rule);
  border-radius: 0.4rem;
  padding: 0.3rem 0.6rem;
}

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

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

.lang-switch .current {
  color: var(--ink);
  border-color: var(--accent);
  font-weight: 600;
}