:root {
  --bg: #fbfaf7;
  --bg-alt: #f2f0eb;
  --ink: #1f2933;
  --ink-sub: #5b6670;
  --line: #dcd8cf;
  --accent: #23415e;
  --wrap: 880px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic", YuGothic, Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.9;
  letter-spacing: 0.03em;
  font-feature-settings: "palt";
  -webkit-font-smoothing: antialiased;
}

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

.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px;
}

/* header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(251, 250, 247, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 60px;
}

.logo {
  color: var(--ink);
  font-weight: 600;
  text-decoration: none;
  letter-spacing: 0.08em;
}

.nav {
  display: flex;
  gap: 24px;
  font-size: 14px;
}

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

.nav a:hover {
  color: var(--accent);
}

/* hero */
.hero {
  padding: 112px 0 96px;
  border-bottom: 1px solid var(--line);
}

.hero-label {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.4em;
}

.hero h1 {
  margin: 0 0 32px;
  font-size: clamp(28px, 5vw, 40px);
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.08em;
}

.hero-lead {
  max-width: 40em;
  margin: 0;
  color: var(--ink-sub);
}

/* sections */
.section {
  padding: 88px 0;
}

.section-alt {
  background: var(--bg-alt);
}

.section-title {
  margin: 0 0 40px;
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.1em;
}

.section-title .en {
  display: block;
  margin-bottom: 4px;
  color: var(--accent);
  font-size: 12px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
}

/* business */
.business {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: biz;
}

.business li {
  padding: 28px 24px;
  background: #fff;
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent);
  counter-increment: biz;
}

.business li::before {
  content: "0" counter(biz);
  display: block;
  margin-bottom: 8px;
  color: var(--accent);
  font-size: 13px;
  letter-spacing: 0.2em;
}

.business h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 600;
}

.business p {
  margin: 0;
  color: var(--ink-sub);
  font-size: 14px;
  line-height: 1.8;
}

/* company profile */
.profile {
  margin: 0;
  border-top: 1px solid var(--line);
}

.profile > div {
  display: grid;
  grid-template-columns: 10em 1fr;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.profile dt {
  color: var(--ink-sub);
  font-size: 14px;
}

.profile dd {
  margin: 0;
}

/* contact */
.mail {
  font-size: 18px;
}

/* footer */
.site-footer {
  padding: 32px 0;
  border-top: 1px solid var(--line);
  color: var(--ink-sub);
  text-align: center;
}

@media (max-width: 720px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    padding-top: 12px;
    padding-bottom: 12px;
  }

  .nav {
    gap: 16px;
    font-size: 13px;
  }

  .hero {
    padding: 72px 0 64px;
  }

  .section {
    padding: 64px 0;
  }

  .business {
    grid-template-columns: 1fr;
  }

  .profile > div {
    grid-template-columns: 1fr;
    gap: 2px;
    padding: 16px 0;
  }
}