:root {
  --bg: #faf7f3;
  --card: #ffffff;
  --text: #24211d;
  --text-dim: #6b645a;
  --accent: #b5714a;
  --accent-soft: #e6b7a1;
  --line: #e7e0d7;
  --sage: #6d8577;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15130f;
    --card: #1e1b16;
    --text: #f1ece3;
    --text-dim: #a89f92;
    --accent: #e6b7a1;
    --accent-soft: #c98a67;
    --line: #332e26;
    --sage: #8ca699;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "Hiragino Sans", "Hiragino Kaku Gothic ProN",
    "Yu Gothic", "Noto Sans JP", "Segoe UI", Roboto, sans-serif;
  line-height: 1.8;
}

.wrap {
  max-width: 680px;
  margin: 0 auto;
  padding: 48px 24px 96px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
  text-decoration: none;
  color: inherit;
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: radial-gradient(circle at 38% 36%, var(--accent-soft), var(--accent) 70%);
  flex-shrink: 0;
}

.brand-name {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

nav.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 40px;
  flex-wrap: wrap;
  gap: 16px;
}

.pagelinks {
  display: flex;
  gap: 18px;
  font-size: 14px;
}

.pagelinks a {
  color: var(--text-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.pagelinks a:hover,
.pagelinks a[aria-current="page"] {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.lang-toggle {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
  font-size: 13px;
}

.lang-toggle button {
  border: none;
  background: transparent;
  color: var(--text-dim);
  padding: 6px 14px;
  cursor: pointer;
  font: inherit;
}

.lang-toggle button.active {
  background: var(--accent);
  color: #fff;
}

h1 {
  font-size: 26px;
  margin: 0 0 4px;
  font-weight: 700;
}

.updated {
  color: var(--text-dim);
  font-size: 13px;
  margin-bottom: 36px;
}

h2 {
  font-size: 17px;
  margin: 36px 0 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

p { margin: 0 0 14px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 24px;
  margin-bottom: 16px;
}

.faq-q {
  font-weight: 600;
  margin-bottom: 6px;
}

.faq-a {
  color: var(--text-dim);
  margin-bottom: 22px;
}

.faq-a:last-child { margin-bottom: 0; }

footer {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  color: var(--text-dim);
  font-size: 13px;
}

.hero {
  text-align: center;
  padding: 64px 0 32px;
}

.hero .brand-mark {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
}

.hero h1 { font-size: 30px; }

.hero p { color: var(--text-dim); max-width: 440px; margin: 0 auto 32px; }

.cta-row {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

.cta-row a {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
}

.cta-row a:hover { border-color: var(--accent); color: var(--accent); }

[data-lang="en"] { display: none; }
html[data-active-lang="en"] [data-lang="ja"] { display: none; }
html[data-active-lang="en"] [data-lang="en"] { display: revert; }