:root {
  --paper: #fffaf2;
  --ink: #3f352f;
  --muted: #796d63;
  --accent: #9b594a;
  --accent-dark: #7b4238;
  --line: #e7d9c8;
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background:
    url("assets/background.png") right center / min(50vw, 100vh) auto no-repeat,
    var(--paper);
  font-family: "Yu Gothic", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
}

a {
  color: inherit;
}

.site-shell {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  width: min(100% - 32px, 920px);
  margin: 0 auto 0 max(24px, 6vw);
  padding: 56px 0;
}

.site-hero {
  display: grid;
  gap: 18px;
  justify-items: start;
  padding: min(12vw, 96px) 0 48px;
}

.site-kicker {
  margin: 0;
  color: var(--accent);
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  max-width: 720px;
  margin: 0;
  color: #b8677b;
  font-size: clamp(2.1rem, 7vw, 4.5rem);
  line-height: 1.15;
  letter-spacing: 0;
}

.site-lead {
  max-width: 620px;
  margin: 0;
  color: var(--muted);
  font-size: 1.08rem;
  line-height: 1.9;
}

.site-mobile-visual {
  display: none;
}

.site-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 10px;
}

.primary-link,
.site-nav a,
.site-nav span {
  min-height: 44px;
  border-radius: 8px;
}

.primary-link {
  display: inline-grid;
  place-items: center;
  padding: 0 22px;
  color: #fff;
  background: var(--accent);
  border: 1px solid var(--accent);
  font-weight: 700;
  text-decoration: none;
}

.primary-link:hover {
  background: var(--accent-dark);
}

.site-nav {
  display: grid;
  grid-template-columns: minmax(0, 320px);
  gap: 12px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.site-nav a,
.site-nav span {
  display: grid;
  place-items: center;
  padding: 0 14px;
  color: var(--ink);
  background: #fffdf8;
  border: 1px solid var(--line);
  font-weight: 700;
  text-align: center;
  text-decoration: none;
}

.site-nav span {
  color: var(--muted);
  background: transparent;
}

.site-footer {
  margin-top: auto;
  padding-top: 28px;
  color: var(--muted);
  font-size: 0.82rem;
}

@media (max-width: 640px) {
  body {
    background: var(--paper);
  }

  .site-shell {
    width: min(100% - 24px, 920px);
    margin: 0 auto;
    padding: 18px 0 32px;
  }

  .site-mobile-visual {
    display: block;
    width: min(100%, 420px);
    height: auto;
    margin: 0 auto;
  }

  .site-hero {
    gap: 1px;
    padding-top: 2px;
  }

  .primary-link {
    width: 100%;
  }

  .site-nav {
    grid-template-columns: 1fr;
  }
}