:root {
  --ink: #0f172a;
  --ink-soft: #475569;
  --ink-faint: #94a3b8;
  --line: #e2e8f0;
  --bg: #f8fafc;
  --surface: #ffffff;
  --accent: #1d4ed8;
  --accent-ink: #ffffff;
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", "Meiryo",
    system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.8;
  font-size: 16px;
}

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

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

.brand {
  margin: 0 auto;
  padding: 20px 20px;
  max-width: 880px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.brand a {
  color: inherit;
  text-decoration: none;
}

main {
  margin: 0 auto;
  padding: 40px 20px 8px;
  max-width: 880px;
}

.intro h1 {
  margin: 0 0 20px;
  font-size: 26px;
  line-height: 1.6;
  font-weight: 700;
}

.intro p {
  margin: 0 0 16px;
  color: var(--ink-soft);
}

.services {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin: 36px 0 48px;
}

.card {
  display: flex;
  flex-direction: column;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
}

.card-muted {
  background: #f1f5f9;
}

.card-label {
  margin: 0;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
}

.card h2 {
  margin: 4px 0 12px;
  font-size: 20px;
  font-weight: 700;
}

.card-body {
  margin: 0 0 20px;
  flex: 1;
  font-size: 14px;
  color: var(--ink-soft);
}

.button {
  display: inline-block;
  padding: 12px 20px;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-ink);
  font-size: 15px;
  font-weight: 700;
  text-align: center;
  text-decoration: none;
}

.button:focus-visible,
.site-footer a:focus-visible,
.operator a:focus-visible,
.brand a:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

.badge {
  display: inline-block;
  align-self: flex-start;
  margin: 0;
  padding: 12px 20px;
  border: 1px dashed var(--ink-faint);
  border-radius: 8px;
  color: var(--ink-soft);
  font-size: 15px;
  font-weight: 700;
}

.operator h2 {
  margin: 0 0 12px;
  font-size: 18px;
  font-weight: 700;
}

.operator dl {
  margin: 0 0 16px;
}

.operator dt {
  font-size: 12px;
  font-weight: 700;
  color: var(--ink-faint);
}

.operator dd {
  margin: 0 0 12px;
  font-size: 15px;
  overflow-wrap: anywhere;
}

.note {
  margin: 0;
  font-size: 13px;
  color: var(--ink-soft);
}

.site-footer {
  margin: 0 auto;
  padding: 32px 20px 48px;
  max-width: 880px;
  border-top: 1px solid var(--line);
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}

.site-footer a {
  font-size: 13px;
}

.copyright {
  margin: 16px 0 0;
  font-size: 12px;
  color: var(--ink-faint);
}

@media (max-width: 420px) {
  .intro h1 {
    font-size: 22px;
  }

  main {
    padding-top: 28px;
  }
}