:root {
  color-scheme: light;
  --brand: #00796b;
  --brand-dark: #005b50;
  --brand-soft: #e0f2f1;
  --ink: #17312e;
  --muted: #60736f;
  --line: #cfe1dd;
  --surface: #ffffff;
  --background: #f4f9f8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--background);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", sans-serif;
  line-height: 1.75;
}

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

.site-header {
  background: linear-gradient(135deg, var(--brand-dark), var(--brand));
  color: #fff;
}

.header-inner,
.content,
.footer-inner {
  width: min(100% - 32px, 860px);
  margin: 0 auto;
}

.header-inner {
  padding: 34px 0 30px;
}

.brand {
  margin: 0;
  color: #fff;
  font-size: clamp(2rem, 7vw, 3rem);
  line-height: 1.15;
  letter-spacing: 0.01em;
}

.tagline {
  margin: 8px 0 0;
  color: rgba(255, 255, 255, 0.88);
}

.content {
  padding: 30px 0 54px;
}

.panel,
.card {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface);
  box-shadow: 0 8px 30px rgba(23, 49, 46, 0.06);
}

.panel {
  padding: clamp(22px, 5vw, 42px);
}

.lead {
  margin: 0 0 26px;
  color: var(--muted);
  font-size: 1.05rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 24px 0;
}

.card {
  display: block;
  padding: 20px;
  color: var(--ink);
  text-decoration: none;
  transition: transform 150ms ease, border-color 150ms ease;
}

.card:hover,
.card:focus-visible {
  border-color: var(--brand);
  transform: translateY(-2px);
}

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

.card span {
  color: var(--muted);
  font-size: 0.92rem;
}

.back-link {
  display: inline-block;
  margin-bottom: 18px;
  font-weight: 700;
  text-decoration: none;
}

h1,
h2 {
  line-height: 1.35;
}

h1 {
  margin: 0 0 10px;
  font-size: clamp(1.75rem, 5vw, 2.35rem);
}

h2 {
  margin: 34px 0 10px;
  padding-top: 4px;
  color: var(--brand-dark);
  font-size: 1.25rem;
}

ul {
  padding-left: 1.35rem;
}

.meta,
.note {
  color: var(--muted);
}

.note {
  padding: 14px 16px;
  border-left: 4px solid var(--brand);
  background: var(--brand-soft);
}

.button {
  display: inline-block;
  padding: 12px 18px;
  border-radius: 999px;
  color: #fff;
  background: var(--brand);
  font-weight: 700;
  text-decoration: none;
}

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  background: #edf5f3;
}

.footer-inner {
  padding: 24px 0;
  font-size: 0.9rem;
}

@media (max-width: 700px) {
  .cards {
    grid-template-columns: 1fr;
  }

  .header-inner {
    padding-top: 26px;
  }
}