:root {
  --bg: #ffffff;
  --bg-alt: #fafafa;
  --fg: #0a0a0a;
  --muted: #6b7280;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --border: #e5e7eb;

  --max-w: 1120px;
  --pad-x: clamp(20px, 4vw, 40px);
  --radius: 12px;
  --transition: 220ms cubic-bezier(0.2, 0.8, 0.2, 1);

  --font-sans: system-ui, -apple-system, "Segoe UI", "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Yu Gothic", Meiryo, sans-serif;
}

* {
  box-sizing: border-box;
}

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  * {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition), opacity var(--transition);
}

img,
svg {
  display: block;
  max-width: 100%;
}

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding-inline: var(--pad-x);
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.logo-mark {
  width: 14px;
  height: 14px;
  background: var(--fg);
  border-radius: 3px;
  transform: rotate(45deg);
}

.logo-text {
  font-size: 16px;
  letter-spacing: 0.06em;
}

.logo-text.small {
  font-size: 14px;
  color: var(--muted);
}

.site-nav {
  display: flex;
  gap: clamp(16px, 3vw, 32px);
  font-size: 14px;
  letter-spacing: 0.04em;
}

.site-nav a {
  color: var(--muted);
  position: relative;
  padding: 4px 0;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--fg);
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--fg);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition);
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* ---------- Hero ---------- */
.hero {
  padding: clamp(80px, 14vh, 160px) 0 clamp(60px, 10vh, 120px);
}

.eyebrow,
.section-eyebrow {
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 16px;
}

.hero-title {
  font-size: clamp(36px, 6vw, 64px);
  line-height: 1.25;
  letter-spacing: -0.01em;
  font-weight: 700;
  margin: 0 0 28px;
}

.hero-lead {
  font-size: clamp(15px, 1.6vw, 17px);
  color: var(--muted);
  max-width: 640px;
  margin: 0 0 48px;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg);
  border-bottom: 1px solid var(--fg);
  padding-bottom: 4px;
}

.hero-cta .cta-arrow {
  transition: transform var(--transition);
}

.hero-cta:hover .cta-arrow,
.hero-cta:focus-visible .cta-arrow {
  transform: translateY(3px);
}

/* ---------- Sections ---------- */
.section {
  padding: clamp(72px, 12vh, 120px) 0;
}

.section-alt {
  background: var(--bg-alt);
  border-block: 1px solid var(--border);
}

.section-title {
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 700;
  letter-spacing: -0.005em;
  margin: 0 0 48px;
}

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 32px;
}

.about-card h3 {
  font-size: 14px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 16px;
}

.about-card p {
  margin: 0;
  color: var(--fg);
}

/* ---------- Services ---------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.service-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: transform var(--transition), border-color var(--transition),
    box-shadow var(--transition);
}

.service-card:hover {
  transform: translateY(-4px);
  border-color: #d1d5db;
  box-shadow: 0 12px 28px -16px rgba(10, 10, 10, 0.18);
}

.service-num {
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--muted);
  margin-bottom: 16px;
}

.service-card h3 {
  font-size: 18px;
  margin: 0 0 12px;
  letter-spacing: -0.005em;
}

.service-card p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

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

.company-row {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
}

.company-row dt {
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0;
}

.company-row dd {
  margin: 0;
  color: var(--fg);
}

@media (max-width: 640px) {
  .company-row {
    grid-template-columns: 1fr;
    gap: 4px;
    padding: 18px 0;
  }
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-inner small {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.04em;
}

/* ---------- Reveal animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 600ms ease, transform 600ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- Responsive nav fallback ---------- */
@media (max-width: 480px) {
  .site-nav {
    gap: 14px;
  }
  .site-nav a {
    font-size: 13px;
  }
  .logo-text {
    font-size: 15px;
  }
}