:root {
  --text: #202124;
  --muted: #667085;
  --border: #e5e7eb;
  --soft: #f7f8fa;
  --link: #3157a4;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background: #fff;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 16px;
  line-height: 1.68;
}

a { color: var(--link); }
a:hover { text-decoration-thickness: 2px; }

.site-header {
  border-bottom: 1px solid var(--border);
  background: #fff;
}

.nav {
  width: min(960px, calc(100% - 40px));
  min-height: 64px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  color: var(--text);
  font-size: 1.05rem;
  font-weight: 700;
  text-decoration: none;
}

.brand-mark { display: none; }

.nav-links { display: flex; gap: 22px; }
.nav-links a { color: #4b5563; text-decoration: none; font-size: 0.9rem; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: #111827; text-decoration: underline; }

.page {
  width: min(780px, calc(100% - 40px));
  margin: 0 auto;
  padding: 58px 0 84px;
}

.hero { margin-bottom: 30px; }
.eyebrow { display: none; }

h1 {
  margin: 0;
  color: #111827;
  font-size: clamp(2rem, 6vw, 2.75rem);
  line-height: 1.2;
  letter-spacing: -0.025em;
}

.lead {
  margin: 14px 0 0;
  color: #4b5563;
  font-size: 1rem;
}

.meta { margin-top: 14px; color: var(--muted); font-size: 0.9rem; }

.card {
  margin-top: 0;
  padding: 0;
  border: 0;
  background: transparent;
}

.card h2 {
  margin: 42px 0 10px;
  padding-top: 4px;
  color: #111827;
  font-size: 1.35rem;
  line-height: 1.35;
}

.card h2:first-child { margin-top: 0; }
.card h3 { margin: 26px 0 8px; font-size: 1.05rem; }
.card p { margin: 8px 0 15px; }
.card li { margin: 7px 0; }
.card ul, .card ol { padding-left: 1.4rem; }

.contents {
  margin: 28px 0 38px;
  padding: 22px 24px;
  border: 1px solid var(--border);
  background: var(--soft);
}
.contents strong { display: block; margin-bottom: 8px; }
.contents ol { margin: 0; padding-left: 1.3rem; columns: 2; column-gap: 36px; }
.contents li { margin: 4px 0; break-inside: avoid; }
.contents a { color: #374151; text-decoration: none; }
.contents a:hover { text-decoration: underline; }

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

.button {
  display: inline-block;
  margin-top: 10px;
  padding: 11px 18px;
  border: 1px solid #1f2937;
  border-radius: 4px;
  background: #1f2937;
  color: #fff;
  font-weight: 700;
  text-decoration: none;
}
.button:hover { color: #fff; background: #111827; }

.link-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 30px;
}
.link-card {
  padding: 24px;
  border: 1px solid var(--border);
  color: var(--text);
  text-decoration: none;
}
.link-card:hover { border-color: #9ca3af; color: var(--text); }
.link-card span { display: block; margin-bottom: 14px; color: var(--muted); font-size: 0.78rem; text-transform: uppercase; letter-spacing: .08em; }
.link-card strong { display: block; font-size: 1.2rem; }
.link-card p { margin: 7px 0 0; color: #4b5563; }

.footer {
  padding: 28px 20px 38px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  text-align: center;
  font-size: 0.84rem;
}

@media (max-width: 640px) {
  .nav { width: min(100% - 28px, 960px); }
  .nav-links { gap: 12px; }
  .nav-links a { font-size: 0.8rem; }
  .page { width: min(100% - 28px, 780px); padding-top: 40px; }
  .link-grid { grid-template-columns: 1fr; }
  .contents ol { columns: 1; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}