/* ============================================
   Animations
   ============================================ */
@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scroll-bounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
}

/* ============================================
   Common Layouts
   ============================================ */
.section {
  padding: 80px 0;
}

.section-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

@media (min-width: 1024px) {
  .section {
    padding: 120px 0;
  }
  .section-inner {
    padding: 0 48px;
  }
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

@media (min-width: 768px) {
  .section-header {
    margin-bottom: 80px;
  }
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 4px;
  font-family: var(--font-ja-sans);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.05em;
  transition: all 0.2s;
  cursor: pointer;
  text-align: center;
}

.btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
  border: 2px solid var(--color-accent);
}

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

.btn-ghost {
  background: transparent;
  color: var(--color-text);
  border: 2px solid var(--color-line);
}

.btn-ghost:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ============================================
   Header
   ============================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0);
  z-index: 1000;
  transition: background 0.3s ease, backdrop-filter 0.3s ease, border-color 0.3s ease;
}

.site-header.scrolled {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(222, 221, 216, 0.3);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px 24px;
}

@media (min-width: 1024px) {
  .header-inner {
    padding: 16px 48px;
  }
}

.site-logo {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-weight: 600;
  transition: opacity 0.2s;
}

.site-logo:hover {
  opacity: 0.7;
}

.site-logo .logo-en {
  font-family: var(--font-en-display);
  font-size: var(--text-2xl);
  font-weight: 600;
  letter-spacing: 0.15em;
}

.site-logo .logo-ja {
  font-family: var(--font-ja-serif);
  font-size: var(--text-xs);
  font-weight: 400;
  opacity: 0.7;
}

.global-nav {
  display: none;
}

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

  .global-nav ul {
    display: flex;
    list-style: none;
    gap: 40px;
    align-items: center;
  }

  .global-nav a {
    font-size: var(--text-sm);
    font-weight: 500;
    position: relative;
    transition: color 0.2s;
  }

  .global-nav a:hover {
    color: var(--color-accent);
  }

  .global-nav a:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 4px;
  }

  .global-nav .nav-cta {
    color: var(--color-accent);
    font-weight: 600;
  }
}

/* Hamburger Menu */
.menu-toggle {
  display: flex;
  flex-direction: column;
  gap: 6px;
  width: 32px;
  height: 32px;
  align-items: center;
  justify-content: center;
  transition: all 0.3s;
  position: relative;
  z-index: 1001;
}

@media (min-width: 768px) {
  .menu-toggle {
    display: none;
  }
}

.menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: all 0.3s;
  transform-origin: center;
}

.menu-toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.menu-toggle.active span:first-child {
  transform: rotate(45deg) translate(8px, 8px);
}

.menu-toggle.active span:last-child {
  transform: rotate(-45deg) translate(7px, -7px);
}

/* Mobile Nav Overlay */
.nav-open {
  overflow: hidden;
}

.nav-open .site-header {
  background: var(--color-surface);
}

.mobile-nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--color-surface);
  z-index: 999;
  align-items: center;
  justify-content: center;
}

.nav-open .mobile-nav-overlay {
  display: flex;
}

.mobile-nav ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 48px;
}

.mobile-nav a {
  font-size: var(--text-2xl);
  font-family: var(--font-ja-serif);
  font-weight: 600;
  color: var(--color-text);
  transition: color 0.2s;
}

.mobile-nav a:hover {
  color: var(--color-accent);
}

.mobile-nav a:last-child {
  color: var(--color-accent);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-hero);
  padding: 100px 24px 80px;
  overflow: hidden;
}

@media (min-width: 1024px) {
  .hero {
    padding: 100px 48px 80px;
  }
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 60px;
  align-items: center;
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .hero-inner {
    grid-template-columns: 1fr 1fr;
    gap: 80px;
  }
}

.hero-content {
  z-index: 1;
}

.hero-label {
  display: inline-block;
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  margin-bottom: 16px;
  text-transform: uppercase;
  opacity: 0;
  animation: fade-up 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.hero-title {
  font-family: var(--font-ja-serif);
  font-size: var(--text-4xl);
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 24px;
  opacity: 0;
  animation: fade-up 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.1s forwards;
}

@media (min-width: 768px) {
  .hero-title {
    font-size: var(--text-5xl);
  }
}

.hero-title em {
  font-style: normal;
  color: var(--color-accent);
}

.hero-sub {
  font-size: var(--text-base);
  color: var(--color-muted);
  margin-bottom: 32px;
  line-height: 1.8;
  opacity: 0;
  animation: fade-up 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.25s forwards;
}

@media (min-width: 768px) {
  .hero-sub {
    font-size: var(--text-lg);
    margin-bottom: 48px;
  }
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  opacity: 0;
  animation: fade-up 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.4s forwards;
}

.hero-visual {
  display: none;
  opacity: 0.3;
}

@media (min-width: 768px) {
  .hero-visual {
    display: block;
    animation: fade-up 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.5s forwards;
    opacity: 0;
  }
}

.hero-visual svg {
  width: 100%;
  height: auto;
}

/* Scroll Indicator */
.scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  color: var(--color-muted);
  font-size: var(--text-xs);
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.scroll-line {
  width: 1px;
  height: 20px;
  background: var(--color-muted);
  animation: scroll-bounce 2s ease-in-out infinite;
}

/* ============================================
   About Section
   ============================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

@media (min-width: 768px) {
  .about-grid {
    grid-template-columns: 200px 1fr;
    gap: 60px;
    align-items: start;
  }
}

.about-label h2 {
  font-size: var(--text-3xl);
  font-weight: 600;
  font-family: var(--font-ja-serif);
}

.company-info {
  display: grid;
  gap: 24px;
}

.info-row {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 16px;
}

@media (min-width: 768px) {
  .info-row {
    grid-template-columns: 120px 1fr;
  }
}

.info-row dt {
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--color-muted);
}

.info-row dd {
  font-size: var(--text-base);
}

/* ============================================
   Label
   ============================================ */
.en-label {
  display: block;
  font-family: var(--font-en-display);
  font-size: var(--text-xl);
  font-weight: 400;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  margin-bottom: 12px;
  text-transform: uppercase;
}

.en-label--light {
  color: var(--color-bg);
  opacity: 0.6;
}

.section h2 {
  font-family: var(--font-ja-serif);
  font-size: var(--text-3xl);
  font-weight: 600;
  margin-bottom: 60px;
}

@media (min-width: 768px) {
  .section h2 {
    font-size: var(--text-4xl);
    margin-bottom: 80px;
  }
}

/* ============================================
   Services Section
   ============================================ */
.service-category {
  margin-bottom: 80px;
}

.service-category-title {
  font-family: var(--font-ja-serif);
  font-size: var(--text-2xl);
  font-weight: 600;
  margin-bottom: 40px;
  text-align: center;
  color: var(--color-text);
}

@media (min-width: 768px) {
  .service-category-title {
    font-size: var(--text-3xl);
    margin-bottom: 60px;
  }
}

.service-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-bottom: 60px;
}

@media (min-width: 768px) {
  .service-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 48px;
    margin-bottom: 80px;
  }
}

@media (min-width: 1024px) {
  .service-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.service-grid--2col {
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .service-grid--2col {
    grid-template-columns: repeat(2, 1fr);
  }
}

.service-card {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: 8px;
  padding: 32px 24px;
  text-align: center;
  transition: all 0.2s;
  position: relative;
}

.service-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(42, 107, 92, 0.1);
}

.card-icon {
  width: 60px;
  height: 60px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
}

.card-icon svg {
  width: 100%;
  height: 100%;
}

.service-card h3 {
  font-family: var(--font-ja-serif);
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: 12px;
}

.service-card p {
  font-size: var(--text-sm);
  color: var(--color-muted);
  margin-bottom: 20px;
  line-height: 1.6;
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  justify-content: center;
}

.tech-tags li {
  background: var(--color-accent-sub);
  color: var(--color-accent);
  padding: 4px 12px;
  border-radius: 16px;
  font-size: var(--text-xs);
  font-weight: 500;
}

.welfare-card {
  position: relative;
}

.status-badge {
  position: absolute;
  top: 16px;
  right: 16px;
  background: var(--color-accent-sub);
  color: var(--color-accent);
  padding: 6px 12px;
  border-radius: 16px;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.05em;
}

.feature-list {
  background: var(--color-accent-sub);
  border-radius: 8px;
  padding: 40px 32px;
}

@media (min-width: 768px) {
  .feature-list {
    padding: 48px 40px;
  }
}

.feature-list h3 {
  font-family: var(--font-ja-serif);
  font-size: var(--text-xl);
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--color-text);
}

.feature-list ul {
  list-style: disc;
  margin-left: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.feature-list li {
  font-size: var(--text-base);
  color: var(--color-text);
}

.welfare-card ul {
  text-align: left;
  list-style: disc;
  margin-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.welfare-card li {
  font-size: var(--text-sm);
  color: var(--color-muted);
}

/* ============================================
   Concept Section
   ============================================ */
.section--dark {
  background: var(--color-text);
  color: var(--color-bg);
}

.concept-text {
  max-width: 800px;
  margin: 0 auto;
  font-size: var(--text-lg);
  font-family: var(--font-ja-serif);
  line-height: 2;
}

@media (min-width: 768px) {
  .concept-text {
    font-size: var(--text-xl);
  }
}

.concept-text p {
  margin-bottom: 32px;
}

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

.concept-emphasis {
  color: var(--color-accent);
}

.concept-emphasis strong {
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-decoration-thickness: 3px;
  text-underline-offset: 6px;
}

/* ============================================
   Strengths Section
   ============================================ */
.strengths-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

@media (min-width: 768px) {
  .strengths-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 48px;
  }
}

@media (min-width: 1024px) {
  .strengths-grid {
    gap: 60px;
  }
}

.strength-item {
  position: relative;
  padding-top: 80px;
}

.strength-num {
  position: absolute;
  top: 0;
  left: 0;
  font-family: var(--font-en-display);
  font-size: 120px;
  font-weight: 400;
  color: var(--color-accent);
  opacity: 0.15;
  line-height: 1;
  z-index: 0;
}

.strength-item h3 {
  font-family: var(--font-ja-serif);
  font-size: var(--text-xl);
  font-weight: 600;
  margin-bottom: 12px;
  position: relative;
  z-index: 1;
}

.strength-item p {
  font-size: var(--text-base);
  color: var(--color-muted);
  line-height: 1.7;
  position: relative;
  z-index: 1;
}

/* ============================================
   Vision Section
   ============================================ */
.section--accent {
  background: var(--color-accent-sub);
}

.vision-list {
  max-width: 600px;
  margin: 0 auto;
  list-style: disc;
  margin-left: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.vision-list li {
  font-size: var(--text-lg);
  font-family: var(--font-ja-serif);
  color: var(--color-text);
  font-weight: 500;
  line-height: 1.6;
}

/* ============================================
   Contact Section
   ============================================ */
.contact-center {
  text-align: center;
  max-width: 560px;
  margin: 0 auto;
}

.contact-lead {
  font-size: var(--text-base);
  color: var(--color-muted);
  margin-bottom: 48px;
  line-height: 1.8;
}

@media (min-width: 768px) {
  .contact-lead {
    font-size: var(--text-lg);
    margin-bottom: 60px;
  }
}

.contact-cards {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

@media (min-width: 768px) {
  .contact-cards {
    gap: 24px;
  }
}

.contact-card {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: 4px;
  padding: 20px 32px;
  transition: all 0.2s;
  min-width: 240px;
}

.contact-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.contact-card:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

@media (min-width: 768px) {
  .contact-card {
    min-width: auto;
    flex: 1;
    max-width: 280px;
  }
}

.contact-card__icon {
  width: 36px;
  height: 36px;
  min-width: 36px;
  border-radius: 50%;
  background: var(--color-accent-sub);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
}

.contact-card__icon svg {
  width: 20px;
  height: 20px;
}

.contact-card__body {
  text-align: left;
}

.contact-card__label {
  font-size: var(--text-xs);
  color: var(--color-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-weight: 600;
  margin-bottom: 4px;
}

.contact-card__value {
  font-size: var(--text-sm);
  color: var(--color-accent);
  font-weight: 500;
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
  background: var(--color-text);
  color: var(--color-bg);
  padding: 60px 0;
  border-top: 1px solid var(--color-line);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  text-align: center;
}

@media (min-width: 768px) {
  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    padding: 0 48px;
  }
}

.footer-logo {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.footer-logo .logo-en {
  font-family: var(--font-en-display);
  font-size: var(--text-2xl);
  font-weight: 600;
  letter-spacing: 0.15em;
}

.footer-logo .logo-ja {
  font-family: var(--font-ja-serif);
  font-size: var(--text-xs);
  font-weight: 400;
  opacity: 0.7;
}

.footer-nav {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  justify-content: center;
}

@media (min-width: 768px) {
  .footer-nav {
    gap: 40px;
  }
}

.footer-nav a {
  font-size: var(--text-sm);
  font-weight: 500;
  transition: opacity 0.2s;
}

.footer-nav a:hover {
  opacity: 0.7;
}

.copyright {
  font-size: var(--text-xs);
  color: var(--color-bg);
  opacity: 0.6;
  margin-top: 16px;
  width: 100%;
}

@media (min-width: 768px) {
  .copyright {
    margin-top: 0;
    width: auto;
    order: 3;
  }
}

/* ============================================
   Animations on Scroll
   ============================================ */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}