:root {
  --ink: #0d1018;
  --ink-muted: #4b556f;
  --paper: #f6f4ef;
  --paper-deep: #e8e3d8;
  --accent: #354280;
  --stroke: #d5d0c6;
  --font: "Hiragino Sans", "Noto Sans JP", "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: light;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.65;
}

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

a:hover {
  text-decoration: underline;
}

.site-header {
  border-bottom: 1px solid var(--stroke);
  background: color-mix(in srgb, var(--paper) 92%, white);
}

.site-header__inner,
.site-main,
.site-footer__inner {
  width: min(720px, calc(100% - 2rem));
  margin-inline: auto;
}

.site-header__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.25rem;
  padding: 1rem 0;
}

.site-logo {
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1.1rem;
  font-size: 0.9rem;
}

.site-nav a {
  color: var(--ink-muted);
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--ink);
  text-decoration: underline;
}

.site-main {
  padding: 2rem 0 3.5rem;
}

.site-main h1 {
  font-size: 1.75rem;
  line-height: 1.3;
  margin: 0 0 1rem;
}

.site-main h2 {
  font-size: 1.15rem;
  margin: 2rem 0 0.65rem;
}

.site-main p,
.site-main li {
  color: var(--ink);
  font-size: 0.95rem;
}

.site-main ul {
  padding-left: 1.2rem;
}

.site-main .muted {
  color: var(--ink-muted);
  font-size: 0.875rem;
}

.site-cta {
  display: inline-block;
  margin-top: 0.5rem;
  padding: 0.65rem 1.15rem;
  border-radius: 999px;
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
}

.site-cta:hover {
  text-decoration: none;
  opacity: 0.92;
}

.site-footer {
  border-top: 1px solid var(--stroke);
  background: var(--paper-deep);
  padding: 1.25rem 0 1.75rem;
  font-size: 0.8125rem;
  color: var(--ink-muted);
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  justify-content: space-between;
}

.site-footer a {
  color: var(--ink-muted);
}