:root {
  --bg: #ffffff;
  --bg-alt: #f6f7f9;
  --text: #111418;
  --text-sub: #5a6270;
  --border: #e4e7eb;
  --accent: #111418;
  --accent-soft: #e8eaee;
  --radius: 12px;
  --max-width: 1080px;
  --font-jp: "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
  --font-en: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-jp);
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: inherit;
  text-decoration: none;
  transition: opacity 0.2s ease;
}

a:hover {
  opacity: 0.6;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 10;
}

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

.logo {
  font-family: var(--font-en);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 0.04em;
}

.logo span {
  color: var(--text-sub);
}

.nav {
  display: flex;
  gap: 28px;
  font-family: var(--font-en);
  font-weight: 500;
  font-size: 14px;
  color: var(--text-sub);
}

@media (max-width: 640px) {
  .nav {
    gap: 16px;
    font-size: 13px;
  }
}

/* Accessibility */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Hero */
.hero {
  position: relative;
  height: calc(100vh - 64px);
  height: calc(100dvh - 64px);
  min-height: 480px;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

#hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.hero-overlay {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 36px;
  padding: 0 24px;
  pointer-events: none;
  z-index: 2;
  text-align: center;
}

.hero-overlay > * {
  pointer-events: auto;
}

.hero-subtitle {
  max-width: 560px;
}

.hero-lead-en {
  font-family: var(--font-en);
  font-weight: 700;
  font-size: clamp(16px, 2vw, 20px);
  letter-spacing: -0.01em;
  margin: 0 0 10px;
  color: var(--text);
}

.hero-lead-jp {
  font-size: 13px;
  color: var(--text-sub);
  margin: 0;
  line-height: 1.9;
}

.scroll-cue {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--text-sub);
  text-transform: uppercase;
}

.scroll-cue:hover {
  opacity: 1;
  color: var(--text);
}

.scroll-cue-arrow {
  font-size: 16px;
  animation: scroll-bob 1.8s ease-in-out infinite;
}

@keyframes scroll-bob {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(6px); }
}

@media (max-width: 640px) {
  .hero-overlay {
    bottom: 28px;
    gap: 24px;
  }
  .hero-lead-jp {
    font-size: 12px;
  }
}

/* Sections */
.section {
  padding: 100px 0;
}

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

.eyebrow {
  font-family: var(--font-en);
  font-weight: 500;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--text-sub);
  margin: 0 0 16px;
  text-transform: uppercase;
}

.section-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 48px;
}

/* About */
.about-text {
  max-width: 720px;
}

.about-text p {
  font-size: 16px;
  margin: 0 0 20px;
}

.about-text p:last-child {
  margin-bottom: 0;
}

/* Services cards */
.cards {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.04);
}

.card-index {
  font-family: var(--font-en);
  font-weight: 700;
  font-size: 13px;
  color: var(--text-sub);
  letter-spacing: 0.1em;
}

.card h3 {
  font-size: 17px;
  font-weight: 700;
  margin: 12px 0 10px;
}

.card p {
  font-size: 14px;
  color: var(--text-sub);
  margin: 0;
  line-height: 1.75;
}

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

.company-info > div {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 24px;
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
}

.company-info dt {
  font-weight: 500;
  color: var(--text-sub);
  font-size: 14px;
}

.company-info dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
}

.purposes {
  margin: 0;
  padding-left: 1.2em;
}

.purposes li {
  margin-bottom: 4px;
}

@media (max-width: 640px) {
  .company-info > div {
    grid-template-columns: 1fr;
    gap: 6px;
    padding: 20px 0;
  }
}

/* Contact */
.contact-lead {
  font-size: 16px;
  color: var(--text-sub);
  max-width: 560px;
  margin: 0 0 32px;
}

.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 14px 24px;
  border-radius: 999px;
  font-family: var(--font-en);
  font-weight: 500;
  font-size: 14px;
  letter-spacing: 0.02em;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease, opacity 0.2s ease;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  opacity: 1;
  transform: translateY(-1px);
  background: #000;
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  opacity: 1;
  background: var(--accent-soft);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
  background: var(--bg);
}

.site-footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-logo {
  font-family: var(--font-en);
  font-weight: 700;
  font-size: 16px;
  margin: 0;
  letter-spacing: 0.04em;
}

.footer-logo span {
  color: var(--text-sub);
}

.footer-copy {
  font-family: var(--font-en);
  font-size: 12px;
  color: var(--text-sub);
  margin: 0;
}