:root {
  --bg: #ffffff;
  --ink: #111827;
  --muted: #6b7280;
  --line: #e5e7eb;
  --line-strong: #d1d5db;
  --surface: #f9fafb;
  --footer-bg: #111827;
  --footer-ink: #d1d5db;
  --footer-muted: #9ca3af;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
}

a {
  color: inherit;
  text-underline-offset: 3px;
}

.wrapper {
  width: min(1200px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 0 0 56px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 16px;
  border-bottom: 1px solid var(--line);
  padding: 20px 0;
}

.brand {
  margin: 0;
  font-size: clamp(1.55rem, 2vw, 2rem);
  font-weight: 800;
  letter-spacing: 0.03em;
  text-decoration: none;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
}

.nav a:hover,
.nav a.current {
  color: var(--ink);
}

.shell {
  max-width: 760px;
  margin: 0 auto;
  padding: clamp(24px, 3vw, 40px) 0;
}

h1 {
  margin: 0 0 16px;
  font-size: clamp(1.55rem, 3vw, 2.1rem);
  line-height: 1.35;
  letter-spacing: 0.01em;
}

h2 {
  margin: 34px 0 8px;
  font-size: 1.1rem;
  line-height: 1.4;
}

h3 {
  margin: 0 0 8px;
  font-size: 1rem;
  line-height: 1.4;
}

p,
li {
  line-height: 1.8;
}

.lead {
  margin: 0 0 28px;
  color: var(--muted);
}

.hero {
  margin-bottom: 28px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--line);
}

.badge {
  display: inline-block;
  margin-bottom: 14px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 0.82rem;
  color: var(--muted);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 700;
  border-radius: 8px;
  padding: 10px 14px;
  border: 1px solid var(--line-strong);
}

.btn.primary {
  background: #111827;
  color: #f9fafb;
  border-color: #111827;
}

.btn.ghost {
  background: #ffffff;
  color: var(--ink);
}

.section {
  margin-top: 30px;
}

.split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.card-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--line);
}

.card {
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

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

.kv {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
  font-size: 0.94rem;
}

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

.kv th {
  width: 32%;
  background: var(--surface);
}

.list {
  margin: 0;
  padding-left: 20px;
}

.meta {
  margin-top: 34px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

.site-footer {
  background: var(--footer-bg);
  color: var(--footer-ink);
  margin-top: 48px;
  padding: 28px 24px;
}

.site-footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
}

.site-footer-brand {
  margin: 0 0 8px;
  color: #f9fafb;
  font-weight: 800;
  letter-spacing: 0.03em;
}

.site-footer-copy {
  margin: 0;
  font-size: 0.85rem;
  color: var(--footer-muted);
}

.site-footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 16px;
}

.site-footer-links a {
  color: var(--footer-muted);
  text-decoration: none;
  font-size: 0.9rem;
}

.site-footer-links a:hover {
  color: #f9fafb;
}

.skip-link {
  font-size: 0.9rem;
  color: var(--muted);
}

@media (max-width: 700px) {
  .wrapper {
    width: calc(100vw - 24px);
  }

  .topbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .site-footer {
    padding: 24px 16px;
  }

  .site-footer-inner {
    flex-direction: column;
  }
}