:root {
  --fg: #1a1d21;
  --fg-mute: #5b6470;
  --line: #e3e6ea;
  --bg: #ffffff;
  --bg-alt: #f6f7f9;
  --accent: #1f5f8b;
  --max: 960px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--fg);
  background: var(--bg);
  font-family: "Helvetica Neue", Arial, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "BIZ UDPGothic", Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
}

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

a { color: inherit; }

/* header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-header .inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.logo {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
}
.site-header nav {
  display: flex;
  gap: 28px;
  font-size: 14px;
}
.site-header nav a {
  color: var(--fg-mute);
  text-decoration: none;
  transition: color 0.2s;
}
.site-header nav a:hover { color: var(--accent); }

/* hero */
.hero {
  padding: 120px 0 104px;
  border-bottom: 1px solid var(--line);
}
.hero-en {
  margin: 0 0 20px;
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--accent);
}
.hero h1 {
  margin: 0 0 32px;
  font-size: 38px;
  line-height: 1.6;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.hero-lead {
  max-width: 640px;
  margin: 0;
  color: var(--fg-mute);
}

/* section */
.section { padding: 88px 0; }
.section-alt {
  background: var(--bg-alt);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.section-label {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--accent);
}
.section h2 {
  margin: 0 0 48px;
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

/* cards */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.card {
  padding: 28px 24px;
  background: var(--bg);
  border: 1px solid var(--line);
}
.card-no {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--accent);
}
.card h3 {
  margin: 0 0 12px;
  font-size: 17px;
  font-weight: 700;
}
.card p {
  margin: 0;
  font-size: 14px;
  color: var(--fg-mute);
}

/* company table */
.company-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}
.company-table th,
.company-table td {
  padding: 18px 8px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}
.company-table th {
  width: 160px;
  font-weight: 700;
  white-space: nowrap;
}
.company-table td { color: var(--fg-mute); }

/* contact */
.contact-lead {
  margin: 0 0 40px;
  color: var(--fg-mute);
}
.contact-form { max-width: 620px; }
.field { margin-bottom: 24px; }
.field label {
  display: block;
  margin-bottom: 8px;
  font-size: 14px;
  font-weight: 700;
}
.req {
  margin-left: 8px;
  padding: 2px 7px;
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.04em;
  color: #fff;
  background: var(--accent);
  vertical-align: 2px;
}
.field input,
.field textarea {
  width: 100%;
  padding: 12px 14px;
  font-family: inherit;
  font-size: 15px;
  line-height: 1.7;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 2px;
  transition: border-color 0.2s;
}
.field input:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--accent);
}
.field textarea { resize: vertical; }
.privacy-note {
  margin: 0 0 20px;
  font-size: 13px;
  line-height: 1.8;
  color: var(--fg-mute);
}
.field-check {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 32px;
  font-size: 14px;
}
.field-check input { width: 16px; height: 16px; }
.field-check label { margin: 0; }
.contact-form button {
  padding: 15px 56px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: #fff;
  background: var(--accent);
  border: none;
  border-radius: 2px;
  cursor: pointer;
  transition: opacity 0.2s;
}
.contact-form button:hover { opacity: 0.85; }

/* footer */
.site-footer {
  padding: 32px 0;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--fg-mute);
}
.site-footer p { margin: 0; }

@media (max-width: 720px) {
  .hero { padding: 72px 0 64px; }
  .hero h1 { font-size: 26px; }
  .section { padding: 64px 0; }
  .cards { grid-template-columns: 1fr; gap: 20px; }
  .site-header nav { gap: 18px; font-size: 13px; }
  .company-table th { width: 96px; font-size: 14px; }
}