:root {
  color-scheme: light;
  --bg: #f7faf8;
  --surface: #ffffff;
  --text: #1b2a28;
  --muted: #5b6c68;
  --line: #dbe7e2;
  --brand: #0f766e;
  --brand-dark: #134e4a;
  --accent: #f2b705;
  --shadow: 0 18px 50px rgba(27, 42, 40, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
  font-family:
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Hiragino Sans",
    "Yu Gothic",
    sans-serif;
  line-height: 1.75;
}

body {
  margin: 0;
  color: var(--text);
  background:
    linear-gradient(180deg, rgba(15, 118, 110, 0.08), rgba(247, 250, 248, 0) 360px),
    var(--bg);
}

a {
  color: var(--brand-dark);
  font-weight: 700;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--brand);
}

.site-header {
  border-bottom: 1px solid rgba(219, 231, 226, 0.8);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  max-width: 980px;
  margin: 0 auto;
  padding: 18px 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-size: 1.05rem;
  font-weight: 800;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  color: #ffffff;
  background: var(--brand);
  font-weight: 900;
  line-height: 1;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 14px 18px;
}

.nav-links a {
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 700;
  text-decoration: none;
}

.nav-links a:hover {
  color: var(--brand-dark);
}

.hero,
.content {
  max-width: 980px;
  margin: 0 auto;
  padding: 56px 24px;
}

.hero {
  display: grid;
  gap: 28px;
  min-height: 58vh;
  align-content: center;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--brand-dark);
  font-size: 0.92rem;
  font-weight: 800;
}

h1,
h2,
h3 {
  margin: 0;
  color: var(--text);
  line-height: 1.28;
}

h1 {
  max-width: 760px;
  font-size: 4.25rem;
  letter-spacing: 0;
}

h2 {
  margin-top: 42px;
  padding-top: 4px;
  font-size: 1.65rem;
}

h3 {
  margin-top: 28px;
  font-size: 1.12rem;
}

p {
  max-width: 760px;
  margin: 14px 0 0;
}

.lead {
  color: var(--muted);
  font-size: 1.18rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 14px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 18px;
  border: 1px solid var(--brand);
  border-radius: 8px;
  color: #ffffff;
  background: var(--brand);
  font-weight: 800;
  text-decoration: none;
}

.button.secondary {
  color: var(--brand-dark);
  background: transparent;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 26px;
}

.summary-card,
.notice,
.faq-item {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.summary-card {
  padding: 20px;
}

.summary-card strong {
  display: block;
  margin-bottom: 6px;
  color: var(--brand-dark);
  font-size: 1.02rem;
}

.notice {
  margin: 28px 0;
  padding: 20px;
  border-left: 5px solid var(--accent);
}

.content {
  padding-top: 42px;
}

.content-main {
  max-width: 820px;
}

ul {
  max-width: 780px;
  margin: 14px 0 0;
  padding-left: 1.3em;
}

li + li {
  margin-top: 8px;
}

.meta-list {
  display: grid;
  grid-template-columns: 11em 1fr;
  gap: 8px 16px;
  max-width: 780px;
  margin: 22px 0 0;
}

.meta-list dt {
  color: var(--muted);
  font-weight: 800;
}

.meta-list dd {
  margin: 0;
}

.faq-list {
  display: grid;
  gap: 14px;
  margin-top: 20px;
}

.faq-item {
  padding: 20px;
}

.faq-item h3 {
  margin-top: 0;
}

.site-footer {
  border-top: 1px solid rgba(219, 231, 226, 0.9);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  max-width: 980px;
  margin: 0 auto;
  padding: 24px;
  color: var(--muted);
  font-size: 0.92rem;
}

@media (max-width: 720px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-links {
    justify-content: flex-start;
  }

  .hero,
  .content {
    padding: 38px 18px;
  }

  .hero {
    min-height: auto;
  }

  h1 {
    font-size: 2.1rem;
  }

  .summary-grid {
    grid-template-columns: 1fr;
  }

  .meta-list {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .footer-inner {
    padding: 22px 18px;
  }
}

@media (max-width: 420px) {
  h1 {
    font-size: 1.95rem;
  }
}