:root {
  color-scheme: light;
  --ink: #17212b;
  --muted: #5c6975;
  --line: #dbe3e8;
  --surface: #f5f8fa;
  --accent: #176b63;
  --accent-dark: #0e504a;
  --notice: #fff8df;
  --notice-line: #e7cf70;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: #fff;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP",
    "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  line-height: 1.8;
}

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

a:hover {
  text-decoration-thickness: 2px;
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: linear-gradient(135deg, #e8f4f1, #f7faf9);
}

.site-header-inner,
.container {
  width: min(960px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header-inner {
  padding: 28px 0 24px;
}

.brand {
  margin: 0 0 4px;
  color: var(--accent-dark);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

h1,
h2,
h3 {
  line-height: 1.4;
}

h1 {
  margin: 0;
  font-size: clamp(1.55rem, 4vw, 2.25rem);
}

h2 {
  margin-top: 2.5em;
  padding-bottom: 0.35em;
  border-bottom: 1px solid var(--line);
  font-size: 1.35rem;
}

h3 {
  margin-top: 1.8em;
  font-size: 1.1rem;
}

.container {
  padding: 30px 0 56px;
}

.meta,
.muted {
  color: var(--muted);
  font-size: 0.92rem;
}

.lead {
  font-size: 1.06rem;
}

.notice {
  margin: 24px 0;
  padding: 16px 18px;
  border: 1px solid var(--notice-line);
  border-radius: 8px;
  background: var(--notice);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 16px;
  margin: 24px 0;
}

.card {
  display: block;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: inherit;
  background: var(--surface);
  text-decoration: none;
}

.card:hover {
  border-color: var(--accent);
}

.card strong {
  display: block;
  margin-bottom: 6px;
  color: var(--accent-dark);
  font-size: 1.08rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0;
  font-size: 0.95rem;
}

th,
td {
  padding: 10px 12px;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--surface);
}

.table-wrap {
  overflow-x: auto;
}

.button {
  display: inline-block;
  margin: 8px 0;
  padding: 10px 18px;
  border-radius: 6px;
  color: #fff;
  background: var(--accent-dark);
  font-weight: 700;
  text-decoration: none;
}

.doc-nav {
  margin-top: 40px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.doc-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  padding-left: 20px;
}

footer {
  padding: 24px 16px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  background: var(--surface);
  text-align: center;
  font-size: 0.88rem;
}

@media (max-width: 640px) {
  .container {
    padding-top: 22px;
  }

  th,
  td {
    min-width: 140px;
  }
}

@media print {
  .site-header {
    background: none;
  }

  .doc-nav,
  footer {
    display: none;
  }

  a {
    color: inherit;
  }
}