:root {
  --bg: #4c566a; /* logo background */
  --text: #ffffff;
  --muted: #e2e8f0;
  --border: rgba(255, 255, 255, 0.18);
  --surface: rgba(255, 255, 255, 0.04);
  --brand: #f8c870; /* logo text */
  --max: 880px;
}

* {
  box-sizing: border-box;
}
html,
body {
  height: 100%;
}
body {
  margin: 0;
  font-family:
    ui-sans-serif,
    system-ui,
    -apple-system,
    Segoe UI,
    Roboto,
    Helvetica,
    Arial,
    "Hiragino Sans",
    "Noto Sans JP",
    "Yu Gothic",
    sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

a {
  color: var(--brand);
  text-decoration-color: rgba(248, 200, 112, 0.35);
  text-underline-offset: 3px;
}
a:hover {
  text-decoration-color: rgba(248, 200, 112, 0.7);
}

.container {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.5rem;
}
.muted {
  color: var(--muted);
}
.small {
  font-size: 0.92rem;
}

.section {
  padding: 2rem 0;
}
.section.alt {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.section h2 {
  margin: 0 0 0.5rem;
  font-family:
    "M PLUS 1",
    ui-sans-serif,
    system-ui,
    -apple-system,
    Segoe UI,
    Roboto,
    Helvetica,
    Arial,
    "Hiragino Sans",
    "Noto Sans JP",
    "Yu Gothic",
    sans-serif;
  font-size: 1.15rem;
}

.title {
  margin: 0 0 0.5rem;
  font-family:
    "M PLUS 1",
    ui-sans-serif,
    system-ui,
    -apple-system,
    Segoe UI,
    Roboto,
    Helvetica,
    Arial,
    "Hiragino Sans",
    "Noto Sans JP",
    "Yu Gothic",
    sans-serif;
  font-size: clamp(1.8rem, 3.2vw, 4rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
}
.title-jp {
  display: block;
  font-weight: 700;
  color: var(--brand);
}
.accent {
  color: var(--brand);
}

.title-logo {
  display: inline-block;
  width: 240px;
}

.title-logo img {
  width: 100%;
  aspect-ratio: 1 / 1;
  border: 2px solid var(--muted);
}

.first-contents {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.facts {
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 8ch 1fr;
  column-gap: 1rem;
  row-gap: 0.5rem;
  align-items: baseline;
}
.facts > div {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: subgrid;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
}
.facts > div:last-child {
  border-bottom: none;
}
.facts dt {
  margin: 0;
  font-size: 0.92rem;
  color: var(--muted);
}
.facts dd {
  margin: 0;
  font-weight: 600;
  color: var(--text);
}

@supports not (grid-template-columns: subgrid) {
  .facts {
    display: block;
  }
  .facts > div {
    display: flex;
    gap: 16px;
    align-items: baseline;
  }
  .facts dt {
    min-width: 8ch;
  }
}

.list {
  margin: 0.5rem 0 0;
  padding-left: 1rem;
}
.list li {
  margin: 0.5rem 0;
}

.site-footer {
  padding: 1.5rem 0;
  background: var(--bg);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  flex-direction: column;
  justify-content: flex-start;
  align-items: flex-start;
}

@media (max-width: 640px) {
  .first-contents {
    flex-direction: column;
    align-items: flex-start;
  }
  .facts {
    display: block;
  }
  .facts > div {
    display: flex;
    flex-direction: column;
    gap: 2px;
  }
  .facts dt {
    min-width: auto;
  }
}