:root {
  color-scheme: light;
  --bg: #f7f8fa;
  --surface: #ffffff;
  --text: #20242a;
  --muted: #5d6673;
  --border: #d9dee6;
  --accent: #254f7a;
  --accent-strong: #17395d;
  --accent-soft: #e8f0f8;
  --focus: #1f6fb2;
  --shadow: 0 8px 24px rgba(24, 38, 55, 0.08);
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #111418;
  --surface: #191e24;
  --text: #f0f3f6;
  --muted: #b3bdc9;
  --border: #333b45;
  --accent: #91bee8;
  --accent-strong: #c3ddf5;
  --accent-soft: #1f2d3b;
  --focus: #9ccbf2;
  --shadow: none;
}
* { box-sizing: border-box; }
html { min-height: 100%; background: var(--bg); }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background: var(--bg);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.7;
}
body.no-js .js-only { display: none; }
body.no-js [data-lang="en"] { display: none; }
body:not(.no-js) [data-lang] { display: none; }
html[data-lang="ja"] body:not(.no-js) [data-lang="ja"],
html[data-lang="en"] body:not(.no-js) [data-lang="en"] { display: revert; }
body:not(.no-js) li[data-lang],
html[data-lang="ja"] body:not(.no-js) li[data-lang="ja"],
html[data-lang="en"] body:not(.no-js) li[data-lang="en"] { display: list-item; }
body:not(.no-js) tr[data-lang],
html[data-lang="ja"] body:not(.no-js) tr[data-lang="ja"],
html[data-lang="en"] body:not(.no-js) tr[data-lang="en"] { display: table-row; }
body:not(.no-js) span[data-lang],
html[data-lang="ja"] body:not(.no-js) span[data-lang="ja"],
html[data-lang="en"] body:not(.no-js) span[data-lang="en"] { display: inline; }
body:not(.no-js) a[data-lang],
html[data-lang="ja"] body:not(.no-js) a[data-lang="ja"],
html[data-lang="en"] body:not(.no-js) a[data-lang="en"] { display: inline-flex; }
.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 20;
  padding: 0.6rem 0.8rem;
  color: var(--surface);
  background: var(--accent-strong);
  border-radius: 6px;
  transition: top 0.12s ease;
}
.skip-link:focus { top: 1rem; }
.site-header { border-bottom: 1px solid var(--border); background: var(--surface); }
.header-inner {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 1rem 0;
  display: grid;
  gap: 0.9rem;
}
.brand-row, .nav-row, .control-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.55rem;
  color: var(--text);
  text-decoration: none;
}
.brand-mark { font-weight: 700; font-size: 1.18rem; }
.brand-subtitle { color: var(--muted); font-size: 0.88rem; }
.site-nav { display: flex; gap: 0.35rem; flex-wrap: wrap; }
.site-nav a, .button-link, .mail-link { color: var(--accent); text-decoration: none; }
.site-nav a { padding: 0.4rem 0.58rem; border-radius: 6px; font-size: 0.95rem; }
.site-nav a:hover, .site-nav a:focus-visible, .site-nav a[aria-current="page"] {
  color: var(--accent-strong);
  background: var(--accent-soft);
}
.segmented {
  display: inline-flex;
  padding: 0.2rem;
  gap: 0.2rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
}
.segmented button {
  min-height: 2.4rem;
  padding: 0.35rem 0.7rem;
  border: 0;
  border-radius: 6px;
  color: var(--muted);
  background: transparent;
  font: inherit;
  font-size: 0.92rem;
  cursor: pointer;
}
.segmented button[aria-pressed="true"] { color: var(--surface); background: var(--accent-strong); }
main {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2rem 0 3.5rem;
}
.hero, .page-title { padding: 1.5rem 0 1rem; }
.eyebrow { margin: 0 0 0.45rem; color: var(--accent); font-weight: 700; font-size: 0.88rem; }
h1, h2, h3, p { overflow-wrap: anywhere; }
h1 { margin: 0; font-size: clamp(2rem, 6vw, 3.25rem); line-height: 1.2; }
h2 { margin: 0 0 0.85rem; font-size: 1.35rem; line-height: 1.35; }
h3 { margin: 0 0 0.55rem; font-size: 1.05rem; line-height: 1.4; }
.lead { max-width: 42rem; margin: 1rem 0 0; color: var(--muted); font-size: 1.08rem; }
.updated { margin: 0.8rem 0 0; color: var(--muted); font-size: 0.95rem; }
.section-grid { display: grid; gap: 1rem; grid-template-columns: repeat(2, minmax(0, 1fr)); }
.section, .info-card {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}
.section { margin-top: 1rem; padding: 1.25rem; }
.info-card { padding: 1.15rem; }
.info-card p, .section p { margin: 0.4rem 0 0; }
.link-list, .clean-list { margin: 0.7rem 0 0; padding-left: 1.2rem; }
.link-list li, .clean-list li { margin: 0.35rem 0; }
.actions { display: flex; flex-wrap: wrap; gap: 0.65rem; margin-top: 1.3rem; }
.button-link, .mail-link {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  padding: 0.55rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  font-weight: 700;
}
.button-link.primary, .mail-link.primary { color: var(--surface); background: var(--accent-strong); border-color: var(--accent-strong); }
.button-link:hover, .button-link:focus-visible, .mail-link:hover, .mail-link:focus-visible { border-color: var(--accent); text-decoration: underline; }
.table-wrap { overflow-x: auto; margin-top: 0.7rem; }
table { width: 100%; border-collapse: collapse; min-width: 34rem; }
th, td { padding: 0.7rem; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; }
th { color: var(--muted); font-size: 0.92rem; font-weight: 700; }
.note { color: var(--muted); font-size: 0.95rem; }
.site-footer { border-top: 1px solid var(--border); background: var(--surface); }
.footer-inner {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 1.3rem 0;
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 0.92rem;
}
a { color: var(--accent); }
a:hover { color: var(--accent-strong); }
button:focus-visible, a:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }
@media (max-width: 720px) {
  .header-inner, main, .footer-inner { width: min(100% - 1.1rem, 1120px); }
  .brand-row, .nav-row, .control-row, .footer-inner { align-items: stretch; flex-direction: column; }
  .brand { align-items: flex-start; flex-direction: column; gap: 0.15rem; }
  .site-nav a { min-height: 2.55rem; display: inline-flex; align-items: center; }
  .segmented { width: 100%; }
  .segmented button { flex: 1 1 0; }
  .section-grid { grid-template-columns: 1fr; }
  h1 { font-size: 2.15rem; }
}