:root {
  /* ── Colors ── */
  --color-primary: #0A1628;
  --color-primary-light: #1a2d4a;
  --color-accent: #0EA5E9;
  --color-accent-hover: #38BDF8;
  --color-accent-subtle: rgba(14, 165, 233, 0.08);
  --color-white: #FFFFFF;
  --color-off-white: #F8FAFC;
  --color-gray-50: #F1F5F9;
  --color-gray-100: #E2E8F0;
  --color-gray-200: #CBD5E1;
  --color-gray-400: #94A3B8;
  --color-gray-500: #64748B;
  --color-gray-600: #475569;
  --color-gray-700: #334155;
  --color-gray-800: #1E293B;
  --color-text: #0F172A;
  --color-text-secondary: #475569;
  --color-text-light: #94A3B8;
  --color-border: #E2E8F0;
  --color-overlay: rgba(10, 22, 40, 0.6);

  /* ── Typography ── */
  --font-sans: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-display: 'Inter', 'Noto Sans JP', sans-serif;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;

  --leading-tight: 1.2;
  --leading-normal: 1.6;
  --leading-relaxed: 1.75;

  --tracking-tight: -0.025em;
  --tracking-normal: 0;
  --tracking-wide: 0.05em;
  --tracking-wider: 0.1em;

  /* ── Spacing ── */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* ── Layout ── */
  --container-max: 1200px;
  --container-narrow: 800px;
  --header-height: 80px;

  /* ── Effects ── */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.04), 0 8px 24px rgba(0, 0, 0, 0.06);

  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
  --transition-smooth: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ══════════════════════════════════════
   RESET & BASE
   ══════════════════════════════════════ */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background-color: var(--color-white);
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

button {
  border: none;
  background: none;
  cursor: pointer;
  font-family: inherit;
}

/* ══════════════════════════════════════
   LAYOUT
   ══════════════════════════════════════ */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container--narrow {
  max-width: var(--container-narrow);
}

.section {
  padding: var(--space-24) 0;
}

.section--alt {
  background-color: var(--color-off-white);
}

.section--dark {
  background-color: var(--color-primary);
  color: var(--color-white);
}

/* ══════════════════════════════════════
   HEADER
   ══════════════════════════════════════ */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

.header.scrolled {
  box-shadow: var(--shadow-md);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.header__logo {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: var(--tracking-tight);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.header__logo-icon {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.header__logo-icon svg {
  width: 28px;
  height: 28px;
}

.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.header__nav-link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-gray-600);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background-color var(--transition-fast);
  letter-spacing: var(--tracking-wide);
}

.header__nav-link:hover {
  color: var(--color-primary);
  background-color: var(--color-gray-50);
}

.header__nav-link.active {
  color: var(--color-accent);
  background-color: var(--color-accent-subtle);
}

/* Hamburger */
.header__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  gap: 5px;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.header__hamburger:hover {
  background-color: var(--color-gray-50);
}

.header__hamburger span {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 1px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.header__hamburger.open span:nth-child(1) {
  transform: rotate(45deg) translate(2.5px, 2.5px);
}

.header__hamburger.open span:nth-child(2) {
  opacity: 0;
}

.header__hamburger.open span:nth-child(3) {
  transform: rotate(-45deg) translate(2.5px, -2.5px);
}

/* Mobile Nav */
.mobile-nav {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.mobile-nav.open {
  opacity: 1;
  visibility: visible;
}

.mobile-nav__inner {
  display: flex;
  flex-direction: column;
  padding: var(--space-8) var(--space-6);
  gap: var(--space-2);
}

.mobile-nav__link {
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-gray-700);
  padding: var(--space-4) var(--space-4);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.mobile-nav__link:hover {
  color: var(--color-accent);
  background-color: var(--color-gray-50);
}

/* ══════════════════════════════════════
   HERO
   ══════════════════════════════════════ */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--color-primary);
}

.hero__bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  transition: transform 8s ease;
}

.hero__bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(10, 22, 40, 0.7) 0%,
    rgba(10, 22, 40, 0.4) 40%,
    rgba(10, 22, 40, 0.3) 100%
  );
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  color: var(--color-white);
  padding: var(--space-8);
  max-width: 800px;
}

.hero__tagline {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-6);
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.8s ease forwards 0.3s;
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-5xl);
  font-weight: 700;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  margin-bottom: var(--space-6);
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.8s ease forwards 0.5s;
}

.hero__title-sub {
  display: block;
  font-size: var(--text-2xl);
  font-weight: 400;
  color: rgba(255, 255, 255, 0.85);
  margin-top: var(--space-3);
  letter-spacing: var(--tracking-normal);
}

.hero__description {
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
  color: rgba(255, 255, 255, 0.8);
  max-width: 560px;
  margin: 0 auto;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.8s ease forwards 0.7s;
}

.hero__scroll-indicator {
  position: absolute;
  bottom: var(--space-10);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  color: rgba(255, 255, 255, 0.5);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  opacity: 0;
  animation: fadeIn 1s ease forwards 1.2s;
}

.hero__scroll-indicator::after {
  content: '';
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, rgba(255,255,255,0.5), transparent);
  animation: scrollLine 2s ease infinite;
}

/* ══════════════════════════════════════
   SECTION HEADERS
   ══════════════════════════════════════ */

.section-header {
  text-align: center;
  margin-bottom: var(--space-16);
}

.section-header__label {
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-4);
}

.section-header__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  letter-spacing: var(--tracking-tight);
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}

.section--dark .section-header__title {
  color: var(--color-white);
}

.section-header__divider {
  width: 48px;
  height: 3px;
  background: var(--color-accent);
  border-radius: 2px;
  margin: 0 auto;
}

/* ══════════════════════════════════════
   CARDS
   ══════════════════════════════════════ */

.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.card {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  padding: var(--space-10) var(--space-8);
  text-align: center;
  border: 1px solid var(--color-border);
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth), border-color var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-hover));
  transform: scaleX(0);
  transition: transform var(--transition-smooth);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: transparent;
}

.card:hover::before {
  transform: scaleX(1);
}

.card__icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-6);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-subtle);
  border-radius: var(--radius-lg);
  color: var(--color-accent);
  transition: background-color var(--transition-base), transform var(--transition-base);
}

.card:hover .card__icon {
  background: var(--color-accent);
  color: var(--color-white);
  transform: scale(1.05);
}

.card__icon svg {
  width: 28px;
  height: 28px;
}

.card__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}

.card__subtitle {
  font-size: var(--text-sm);
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: var(--space-4);
  letter-spacing: var(--tracking-wide);
}

.card__description {
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  color: var(--color-text-secondary);
}

.card__link {
  display: inline-block;
  margin-top: 1rem;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-accent);
  text-decoration: none;
  transition: opacity 0.2s;
}

.card__link:hover {
  opacity: 0.7;
}

/* ══════════════════════════════════════
   COMPANY INFO TABLE
   ══════════════════════════════════════ */

.info-table {
  width: 100%;
  max-width: var(--container-narrow);
  margin: 0 auto;
}

.info-table__row {
  display: flex;
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-5) 0;
  align-items: baseline;
}

.info-table__label {
  flex: 0 0 180px;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-primary);
  letter-spacing: var(--tracking-wide);
}

.info-table__value {
  flex: 1;
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
}

/* ══════════════════════════════════════
   CTA SECTION
   ══════════════════════════════════════ */

.cta {
  text-align: center;
  padding: var(--space-20) var(--space-6);
}

.cta__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: var(--space-4);
}

.cta__description {
  font-size: var(--text-lg);
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: var(--space-8);
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  letter-spacing: var(--tracking-wide);
}

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

.btn--primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(14, 165, 233, 0.35);
}

.btn--outline {
  border: 1.5px solid var(--color-white);
  color: var(--color-white);
}

.btn--outline:hover {
  background: var(--color-white);
  color: var(--color-primary);
}

.btn--lg {
  font-size: var(--text-base);
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-lg);
}

.btn svg {
  width: 16px;
  height: 16px;
}

/* ══════════════════════════════════════
   CONTACT FORM
   ══════════════════════════════════════ */

.contact-form {
  max-width: var(--container-narrow);
  margin: 0 auto;
}

.form-group {
  margin-bottom: var(--space-6);
}

.form-group__label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}

.form-group__label .required {
  color: #EF4444;
  margin-left: var(--space-1);
}

.form-group__input,
.form-group__textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--color-white);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}

.form-group__input:focus,
.form-group__textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.12);
}

.form-group__textarea {
  resize: vertical;
  min-height: 160px;
}

/* ══════════════════════════════════════
   FOOTER
   ══════════════════════════════════════ */

.footer {
  background: var(--color-primary);
  color: rgba(255, 255, 255, 0.6);
  padding: var(--space-16) 0 var(--space-8);
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-12);
}

.footer__brand {
  flex: 0 0 auto;
}

.footer__logo {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.footer__logo svg {
  width: 24px;
  height: 24px;
}

.footer__tagline {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.4);
}

.footer__nav {
  display: flex;
  gap: var(--space-8);
}

.footer__nav-link {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.6);
  transition: color var(--transition-fast);
}

.footer__nav-link:hover {
  color: var(--color-white);
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: var(--space-8);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer__copy {
  font-size: var(--text-xs);
  color: rgba(255, 255, 255, 0.35);
}

.footer__address {
  font-size: var(--text-xs);
  color: rgba(255, 255, 255, 0.35);
}

/* ══════════════════════════════════════
   PAGE HEADER (inner pages)
   ══════════════════════════════════════ */

.page-header {
  padding-top: calc(var(--header-height) + var(--space-20));
  padding-bottom: var(--space-16);
  background: var(--color-primary);
  color: var(--color-white);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(14, 165, 233, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.page-header__label {
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-4);
}

.page-header__title {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: 700;
  letter-spacing: var(--tracking-tight);
}

/* ══════════════════════════════════════
   MISSION SECTION
   ══════════════════════════════════════ */

.mission {
  text-align: center;
  max-width: var(--container-narrow);
  margin: 0 auto;
}

.mission__text {
  font-size: var(--text-xl);
  line-height: var(--leading-relaxed);
  color: var(--color-text-secondary);
}

.mission__text em {
  font-style: normal;
  color: var(--color-accent);
  font-weight: 600;
}

/* ══════════════════════════════════════
   SCROLL ANIMATIONS
   ══════════════════════════════════════ */

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }

/* ══════════════════════════════════════
   KEYFRAMES
   ══════════════════════════════════════ */

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  to { opacity: 1; }
}

@keyframes scrollLine {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ══════════════════════════════════════
   RESPONSIVE
   ══════════════════════════════════════ */

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  .header__nav {
    display: none;
  }

  .header__hamburger {
    display: flex;
  }

  .mobile-nav {
    display: block;
  }

  .hero__title {
    font-size: var(--text-3xl);
  }

  .hero__title-sub {
    font-size: var(--text-lg);
  }

  .hero__description {
    font-size: var(--text-base);
  }

  .cards-grid {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .section {
    padding: var(--space-16) 0;
  }

  .section-header {
    margin-bottom: var(--space-10);
  }

  .section-header__title {
    font-size: var(--text-2xl);
  }

  .info-table__row {
    flex-direction: column;
    gap: var(--space-1);
  }

  .info-table__label {
    flex: none;
  }

  .footer__inner {
    flex-direction: column;
    gap: var(--space-8);
  }

  .footer__nav {
    flex-wrap: wrap;
    gap: var(--space-4) var(--space-6);
  }

  .footer__bottom {
    flex-direction: column;
    gap: var(--space-3);
    text-align: center;
  }

  .page-header {
    padding-top: calc(var(--header-height) + var(--space-12));
    padding-bottom: var(--space-10);
  }

  .page-header__title {
    font-size: var(--text-3xl);
  }

  .cta__title {
    font-size: var(--text-2xl);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-4);
  }

  .hero__content {
    padding: var(--space-4);
  }

  .hero__title {
    font-size: var(--text-2xl);
  }

  .card {
    padding: var(--space-8) var(--space-6);
  }
}