:root {
  --ink: #16202b;
  --ink-soft: #4a5966;
  --paper: #f7f8f9;
  --paper-deep: #eceef1;
  --indigo: #2e4a7d;
  --moss: #5f7566;
  --rule: #d7dde2;
  --mincho: "Hiragino Mincho ProN", "Yu Mincho", "YuMincho", "MS PMincho", serif;
  --gothic: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Meiryo", sans-serif;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--gothic);
  font-size: 16px;
  line-height: 1.9;
  font-feature-settings: "palt" 1;
}

.wrap {
  max-width: 44rem;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ---- masthead ---- */

.masthead {
  border-bottom: 1px solid var(--rule);
  padding: 2rem 0 1.25rem;
}

.masthead .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
}

.wordmark {
  font-family: var(--mincho);
  font-size: 1.25rem;
  letter-spacing: 0.18em;
  color: var(--ink);
  text-decoration: none;
}

.masthead nav {
  display: flex;
  gap: 1.5rem;
  font-size: 0.875rem;
}

.masthead nav a {
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}

.masthead nav a:hover,
.masthead nav a:focus-visible {
  color: var(--indigo);
  border-bottom-color: var(--indigo);
}

/* ---- hero ---- */

.hero {
  padding: 4.5rem 0 3.5rem;
  border-bottom: 1px solid var(--rule);
}

.hero h1 {
  font-family: var(--mincho);
  font-weight: 400;
  font-size: clamp(1.9rem, 5.5vw, 2.7rem);
  line-height: 1.5;
  letter-spacing: 0.06em;
  margin: 0 0 1.5rem;
}

.hero p {
  margin: 0;
  max-width: 34rem;
  color: var(--ink-soft);
}

/* ---- sections ---- */

section {
  padding: 3.5rem 0;
  border-bottom: 1px solid var(--rule);
}

section:last-of-type { border-bottom: 0; }

h2 {
  font-family: var(--mincho);
  font-weight: 400;
  font-size: 1.4rem;
  letter-spacing: 0.1em;
  margin: 0 0 1.75rem;
}

h3 {
  font-size: 1rem;
  font-weight: 600;
  margin: 2.25rem 0 0.75rem;
}

p { max-width: 34rem; }

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

/* ---- definition table ---- */

dl.facts {
  margin: 0;
  border-top: 1px solid var(--rule);
}

dl.facts > div {
  display: flex;
  flex-wrap: wrap;
  gap: 0 1.5rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--rule);
}

dl.facts dt {
  flex: 0 0 7.5rem;
  color: var(--ink-soft);
  font-size: 0.875rem;
  line-height: 1.9;
}

dl.facts dd {
  margin: 0;
  flex: 1 1 16rem;
}

/* ---- clinic network ---- */

.tier { margin-bottom: 2.75rem; }

.tier:last-child { margin-bottom: 0; }

.tier-head {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding-bottom: 0.6rem;
  margin-bottom: 0.25rem;
  border-bottom: 2px solid var(--indigo);
}

.tier-group .tier-head { border-bottom-color: var(--moss); }

.tier-head h3 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
}

.tier-head span {
  font-size: 0.8125rem;
  color: var(--ink-soft);
}

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

.clinics li {
  padding: 1rem 0;
  border-bottom: 1px solid var(--rule);
}

.clinics .name {
  font-size: 1.0625rem;
  display: block;
}

.clinics .meta {
  display: block;
  font-size: 0.875rem;
  color: var(--ink-soft);
  margin-top: 0.15rem;
}

.note {
  font-size: 0.875rem;
  color: var(--ink-soft);
  margin-top: 1.25rem;
  max-width: 34rem;
}

/* ---- modules ---- */

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

.modules li {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--rule);
}

.modules li:first-child { border-top: 1px solid var(--rule); }

.modules strong {
  display: block;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.modules span {
  color: var(--ink-soft);
  font-size: 0.9375rem;
}

/* ---- footer ---- */

footer {
  background: var(--paper-deep);
  padding: 2.5rem 0;
  font-size: 0.875rem;
  color: var(--ink-soft);
}

footer p { margin: 0 0 0.4rem; }

footer .lang { margin-top: 1.25rem; }

@media (max-width: 30rem) {
  .hero { padding: 3rem 0 2.5rem; }
  dl.facts dt { flex-basis: 100%; }
}