:root {
  --main: #008080;
  --text: #24323d;
  --muted: #5b6b76;
  --line: #d8e3e3;
  --soft: #e7f6f5;
  --shadow: 0 12px 28px rgba(21, 45, 54, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(0, 128, 128, 0.08), transparent 28%),
    linear-gradient(180deg, #f8fbfc 0%, #eef4f4 100%);
  line-height: 1.8;
}

.page {
  width: min(860px, calc(100% - 24px));
  margin: 0 auto;
  padding: 20px 0 28px;
}

.back-link {
  display: inline-flex;
  margin-bottom: 16px;
  color: var(--main);
  font-weight: 700;
  text-decoration: none;
}

.back-link:hover,
.back-link:focus-visible {
  text-decoration: underline;
}

.hero,
.content-card {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: var(--shadow);
}

.hero {
  padding: 26px;
}

.hero-badge {
  display: inline-flex;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--soft);
  color: var(--main);
  font-size: 0.82rem;
  font-weight: 700;
}

h1 {
  margin: 14px 0 10px;
  font-size: clamp(1.8rem, 4vw, 2.35rem);
  line-height: 1.35;
}

.lead {
  margin: 0;
  color: var(--muted);
}

.content-card {
  margin-top: 18px;
  padding: 24px;
}

.section-block + .section-block {
  margin-top: 22px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

h2 {
  margin: 0 0 10px;
  font-size: 1.18rem;
  line-height: 1.45;
}

p,
ul {
  margin: 0;
}

p + p,
p + ul,
ul + p {
  margin-top: 10px;
}

ul {
  padding-left: 1.3em;
}

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

a {
  color: var(--main);
  font-weight: 700;
  word-break: break-all;
}

.notice {
  margin-top: 16px;
  padding: 14px 16px;
  border: 1px solid rgba(0, 128, 128, 0.22);
  border-left: 5px solid var(--main);
  border-radius: 14px;
  background: #f2fbfa;
}

@media (max-width: 640px) {
  .page {
    width: min(100% - 16px, 860px);
    padding-top: 14px;
  }

  .hero,
  .content-card {
    padding: 18px;
    border-radius: 16px;
  }
}