:root {
  --bg: #ffffff;
  --fg: #0a0a0a;
  --sub: #6b6b6b;
  --border: #e5e5e5;
  --accent: #2d5bff;
  --max: 1200px;
  --pad: clamp(24px, 5vw, 48px);
  --font-jp: "Noto Sans JP", "Inter Tight", system-ui, -apple-system, sans-serif;
  --font-en: "Inter Tight", system-ui, -apple-system, sans-serif;
}

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

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

body {
  margin: 0;
  font-family: var(--font-jp);
  font-weight: 400;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.7;
  font-feature-settings: "palt";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

:lang(en) body,
body[lang="en"] {
  font-family: var(--font-en);
  line-height: 1.6;
}

h1, h2, h3, p { margin: 0; }

a { color: inherit; }

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

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

/* ============ Header ============ */

.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding-block: 20px;
  transition: background 240ms ease, border-color 240ms ease;
  background: transparent;
  border-bottom: 1px solid transparent;
}

.site-header.is-scrolled {
  background: rgba(255, 255, 255, 0.94);
  border-bottom-color: var(--border);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max);
  margin: 0 auto;
  padding-inline: var(--pad);
}

.logo {
  font-family: var(--font-en);
  font-weight: 600;
  font-size: 22px;
  letter-spacing: -0.02em;
  color: var(--fg);
  text-decoration: none;
}

.nav {
  display: flex;
  gap: 32px;
  align-items: center;
}

.nav a {
  color: var(--fg);
  text-decoration: none;
  font-size: 14px;
  font-family: var(--font-en);
  font-weight: 500;
  position: relative;
  padding-block: 4px;
}

.nav a:not(.lang)::after {
  content: '';
  position: absolute;
  left: 0; right: 100%;
  bottom: 0;
  height: 1px;
  background: var(--fg);
  transition: right 240ms ease;
}

.nav a:not(.lang):hover::after { right: 0; }

.lang {
  font-size: 12px;
  letter-spacing: 0.1em;
  text-decoration: none;
  color: var(--sub);
}

.lang strong {
  color: var(--fg);
  font-weight: 500;
}

.lang span { padding-inline: 6px; opacity: 0.4; }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  width: 28px;
  height: 28px;
  position: relative;
  cursor: pointer;
  padding: 0;
}

.nav-toggle span {
  position: absolute;
  left: 4px; right: 4px;
  height: 1px;
  background: var(--fg);
  transition: transform 240ms ease, top 240ms ease, opacity 240ms ease;
}

.nav-toggle span:nth-child(1) { top: 10px; }
.nav-toggle span:nth-child(2) { top: 18px; }

.nav-toggle.is-open span:nth-child(1) {
  top: 14px;
  transform: rotate(45deg);
}

.nav-toggle.is-open span:nth-child(2) {
  top: 14px;
  transform: rotate(-45deg);
}

@media (max-width: 768px) {
  .nav-toggle { display: block; }

  .nav {
    position: fixed;
    inset: 0;
    top: 0;
    background: #fff;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 40px;
    transform: translateY(-100%);
    transition: transform 360ms ease;
    visibility: hidden;
  }

  .nav.is-open {
    transform: translateY(0);
    visibility: visible;
  }

  .nav a:not(.lang) { font-size: 22px; }
}

/* ============ Hero ============ */

.hero {
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  padding-top: 120px;
  padding-bottom: 120px;
}

.hero__title {
  font-family: var(--font-en);
  font-size: clamp(44px, 9vw, 104px);
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 1.02;
}

.hero__divider {
  width: 64px;
  height: 1px;
  background: var(--fg);
  margin: 28px 0;
}

.hero__sub {
  font-family: var(--font-en);
  font-size: clamp(18px, 2.6vw, 28px);
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--fg);
}

.hero__est {
  position: absolute;
  bottom: 48px;
  right: var(--pad);
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--sub);
  text-transform: uppercase;
}

@media (max-width: 640px) {
  .hero__est {
    bottom: 32px;
    font-size: 10px;
  }
}

/* ============ Sections ============ */

section {
  padding-block: clamp(80px, 14vw, 160px);
}

.section__head {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: clamp(48px, 8vw, 80px);
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--sub);
  text-transform: uppercase;
}

.section__head::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* Service */

.service__item {
  padding-block: clamp(32px, 5vw, 48px);
  border-bottom: 1px solid var(--border);
}

.service__item:first-child { border-top: 1px solid var(--border); }

.service__title {
  font-family: var(--font-en);
  font-size: clamp(28px, 4.5vw, 44px);
  font-weight: 600;
  letter-spacing: -0.025em;
}

.service__divider {
  width: 40px;
  height: 1px;
  background: var(--fg);
  margin: 20px 0;
}

.service__desc {
  font-size: clamp(15px, 1.6vw, 17px);
  max-width: 640px;
  color: var(--fg);
}

/* Company */

.company-table {
  border-collapse: collapse;
  width: 100%;
  max-width: 760px;
}

.company-table tr { border-bottom: 1px solid var(--border); }
.company-table tr:first-child { border-top: 1px solid var(--border); }

.company-table th,
.company-table td {
  text-align: left;
  padding: 22px 0;
  font-weight: 400;
  vertical-align: top;
  font-size: 15px;
}

.company-table th {
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: 0.15em;
  color: var(--sub);
  text-transform: uppercase;
  width: 140px;
  padding-right: 24px;
}

@media (max-width: 640px) {
  .company-table th { width: 96px; font-size: 11px; }
  .company-table td { font-size: 14px; }
}

/* ============ Footer ============ */

.site-footer {
  border-top: 1px solid var(--border);
  padding-block: 32px;
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--sub);
}

.site-footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--max);
  margin: 0 auto;
  padding-inline: var(--pad);
}

.site-footer .logo {
  font-size: 16px;
  color: var(--sub);
}

/* ============ CEO Card Page ============ */

body.card-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.card-page__main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 140px var(--pad) 80px;
}

.card {
  text-align: center;
  max-width: 480px;
  width: 100%;
}

.card__name-jp {
  font-size: clamp(28px, 5.5vw, 40px);
  font-weight: 700;
  letter-spacing: 0.08em;
  margin: 0;
}

.card__name-en {
  font-family: var(--font-en);
  font-size: 13px;
  letter-spacing: 0.32em;
  color: var(--sub);
  margin-top: 10px;
  text-transform: uppercase;
}

.card[lang="en"] .card__name-jp {
  font-family: var(--font-en);
  font-size: clamp(32px, 6vw, 48px);
  font-weight: 600;
  letter-spacing: -0.01em;
  text-transform: none;
}

.card__divider {
  width: 48px;
  height: 1px;
  background: var(--fg);
  margin: 32px auto;
}

.card__title-jp {
  font-size: 16px;
  font-weight: 400;
}

.card__title-en {
  font-family: var(--font-en);
  font-size: 12px;
  color: var(--sub);
  letter-spacing: 0.18em;
  margin-top: 6px;
  text-transform: uppercase;
}

.card__company {
  margin-top: 36px;
  font-size: 15px;
  line-height: 1.9;
}

.card__company strong {
  font-weight: 600;
  display: inline-block;
  margin-bottom: 4px;
}

.card__actions {
  margin-top: 56px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
}

.btn {
  display: inline-block;
  padding: 14px 32px;
  border: 1px solid var(--fg);
  background: transparent;
  color: var(--fg);
  font-family: var(--font-en);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  border-radius: 999px;
  transition: background 200ms ease, color 200ms ease;
  min-width: 240px;
  text-align: center;
}

.btn:hover {
  background: var(--fg);
  color: var(--bg);
}

/* ============ Modal ============ */

.modal {
  position: fixed;
  inset: 0;
  background: rgba(10, 10, 10, 0.86);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: var(--pad);
  opacity: 0;
  transition: opacity 200ms ease;
}

.modal.is-open {
  display: flex;
  opacity: 1;
}

.modal__inner {
  background: #fff;
  padding: 40px;
  text-align: center;
  max-width: 360px;
  width: 100%;
}

.modal__qr {
  width: 280px;
  height: 280px;
  margin: 0 auto;
  display: block;
}

.modal__url {
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--sub);
  margin-top: 24px;
  word-break: break-all;
}

.modal__close {
  margin-top: 24px;
  background: none;
  border: 1px solid var(--border);
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  padding: 10px 28px;
  cursor: pointer;
  border-radius: 999px;
  color: var(--sub);
}

.modal__close:hover {
  border-color: var(--fg);
  color: var(--fg);
}

/* ============ Reveal animation ============ */

[data-reveal] {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 700ms ease, transform 700ms ease;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ============ Print: paper business card ============ */

@media print {
  .site-header,
  .site-footer,
  .card__actions,
  .modal { display: none !important; }

  body.card-body { background: #fff; }

  .card-page__main {
    padding: 0;
    min-height: 0;
    align-items: flex-start;
  }

  .card {
    padding: 14mm 16mm;
    border: 1px solid #999;
    width: 91mm;
    height: 55mm;
    margin: 16mm auto;
    text-align: left;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  .card__name-jp { font-size: 18pt; letter-spacing: 0.05em; }
  .card__name-en { font-size: 8pt; margin-top: 4px; }
  .card__divider { display: none; }
  .card__title-jp { font-size: 9pt; margin-top: 8px; }
  .card__title-en { display: none; }
  .card__company { margin-top: 8px; font-size: 8pt; line-height: 1.5; }
}