:root {
  color-scheme: light dark;
  --paper: #f8f3e7;
  --paper-deep: #efe7d4;
  --ink: #2b2b2b;
  --muted: #6b6558;
  --green: #2e6544;
  --line: #ded5c2;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.7 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

.page {
  width: min(100% - 40px, 720px);
  margin: 0 auto;
  padding: 24px 0 80px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 48px;
  font-size: .9rem;
}

.home,
a { color: var(--green); }

.home { text-decoration: none; }

.lang-switch { display: inline-flex; gap: 2px; }

.lang-switch button {
  border: 0;
  border-radius: 6px;
  padding: 2px 8px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font: inherit;
}

.lang-switch button.active {
  background: var(--paper-deep);
  color: var(--green);
  font-weight: 600;
}

h1 {
  margin: 0 0 8px;
  font-size: clamp(2rem, 8vw, 3rem);
  line-height: 1.1;
  letter-spacing: -.04em;
}

h2 {
  margin: 2.3em 0 .5em;
  font-size: 1.15rem;
}

p { margin: .7em 0; }

.lead,
.muted { color: var(--muted); }

.lead {
  max-width: 42rem;
  margin: 0 0 40px;
  font-size: 1.05rem;
}

address {
  margin: 1.2em 0;
  font-style: normal;
}

.contact-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.contact-list li { margin: .35em 0; }

button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 3px;
}

footer {
  margin-top: 64px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: .85rem;
}

footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
}

[data-lang="en"] .lang-ja,
[data-lang="ja"] .lang-en { display: none; }

@media (max-width: 560px) {
  .page { width: min(100% - 32px, 720px); }
  .topbar { margin-bottom: 36px; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #191713;
    --paper-deep: #29251d;
    --ink: #eee8da;
    --muted: #b9b09f;
    --green: #8fc6a3;
    --line: #443e32;
  }
}