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

:root {
  --bg: #fafafa;
  --text: #0a0a0a;
  --text-secondary: #3d3d3d;
  --border: #e5e5e5;
  --accent: #0a0a0a;
  --badge: #d1ecff;
}

body {
  font-family: 'Inter', 'Noto Sans JP', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(250, 250, 250, 0.8);
  backdrop-filter: blur(20px);
  z-index: 1000;
  border-bottom: 1px solid var(--border);
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 3rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.logo {
  text-decoration: none;
}

.logo-text {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.02em;
}

.nav ul {
  list-style: none;
  display: flex;
  gap: 2.5rem;
}

.nav a {
  text-decoration: none;
  color: var(--text);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: color 0.2s ease;
  letter-spacing: -0.01em;
}

.nav a:hover {
  color: var(--text-secondary);
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 10rem 3rem 6rem;
  position: relative;
}

.hero-content {
  text-align: center;
  max-width: 900px;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: var(--badge);
  color: var(--text);
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 2rem;
}

.hero h1 {
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 600;
  margin-bottom: 2rem;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.hero p {
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  color: var(--text-secondary);
  margin-bottom: 3rem;
  line-height: 1.6;
  letter-spacing: -0.01em;
}

.cta-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  padding: 1.125rem 2.5rem;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
  letter-spacing: -0.01em;
}

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

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1.5px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--text);
}

/* Product Section */
.product-section {
  padding: 8rem 3rem;
  background: var(--bg);
}

.section-content {
  max-width: 1400px;
  margin: 0 auto;
}

.section-badge {
  display: inline-block;
  padding: 0.375rem 0.875rem;
  background: var(--badge);
  color: var(--text);
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1.5rem;
}

.section-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 600;
  margin-bottom: 1.5rem;
  letter-spacing: -0.03em;
}

.section-description {
  font-size: 1.375rem;
  color: var(--text-secondary);
  margin-bottom: 5rem;
  max-width: 700px;
  line-height: 1.6;
  letter-spacing: -0.01em;
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.product-card {
  background: #ffffff;
  border-radius: 24px;
  padding: 3rem;
  border: 1px solid var(--border);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.08);
}

.product-icon {
  width: 72px;
  height: 72px;
  background: var(--text);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  margin-bottom: 2rem;
  position: relative;
  z-index: 1;
}

.product-card h3 {
  font-size: 1.75rem;
  margin-bottom: 1rem;
  position: relative;
  z-index: 1;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.product-card p {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: 2rem;
  position: relative;
  z-index: 1;
  letter-spacing: -0.01em;
  flex-grow: 1;
}

.product-features {
  list-style: none;
  position: relative;
  z-index: 1;
  display: grid;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.product-features li {
  padding: 0.75rem 0;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text);
  font-size: 0.9375rem;
}

.feature-check {
  width: 24px;
  height: 24px;
  background: var(--text);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--bg);
  flex-shrink: 0;
  font-size: 0.75rem;
  font-weight: 600;
}

.product-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 1.75rem;
  background: var(--text);
  color: var(--bg);
  text-decoration: none;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9375rem;
  transition: all 0.2s ease;
  border: none;
  cursor: pointer;
  width: fit-content;
  margin-top: auto;
}

.product-link:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.product-link.disabled {
  background: var(--text);
  color: var(--bg);
  cursor: not-allowed;
  opacity: 0.3;
}

.product-link.disabled:hover {
  transform: none;
  box-shadow: none;
}

.product-card.new-business {
  background: linear-gradient(135deg, #ffffff 0%, #f8f8f8 100%);
  border: 2px dashed var(--border);
}

.coming-soon-badge {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: var(--badge);
  color: var(--text);
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: auto;
  width: fit-content;
}

/* Mission Section */
.mission-section {
  padding: 8rem 3rem;
  background: #ffffff;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.mission-content {
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
}

.mission-content h2 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 600;
  margin-bottom: 2.5rem;
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.mission-content p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  line-height: 1.8;
  letter-spacing: -0.01em;
}

/* Company Section */
.company-section {
  padding: 8rem 3rem;
  background: var(--bg);
}

.company-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.info-card {
  background: #ffffff;
  padding: 2.5rem;
  border-radius: 16px;
  border: 1px solid var(--border);
  transition: all 0.3s ease;
}

.info-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.06);
}

.info-card h3 {
  color: var(--text-secondary);
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.info-card p {
  font-size: 1.375rem;
  color: var(--text);
  font-weight: 500;
  letter-spacing: -0.01em;
}

/* Contact Section */
.contact-section {
  padding: 6rem 3rem;
  background: #ffffff;
  border-top: 1px solid var(--border);
}

.contact-content {
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
}

.contact-content .section-description {
  margin-bottom: 2rem;
}

.contact-content .btn {
  margin-top: 0;
  display: inline-block;
}

/* Footer */
.site-footer {
  text-align: center;
  padding: 3rem;
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.9375rem;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 28px;
  height: 20px;
  cursor: pointer;
  z-index: 1100;
}

.hamburger span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--text);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.hamburger.active span:nth-child(1) {
  transform: translateY(9px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: translateY(-9px) rotate(-45deg);
}

/* Responsive */
@media (max-width: 768px) {
  .container {
    padding: 0 1.5rem;
  }

  .hamburger {
    display: flex;
  }

  .nav ul {
    position: absolute;
    top: 100%;
    right: 1.5rem;
    background: #ffffff;
    flex-direction: column;
    width: 220px;
    padding: 1.5rem;
    display: none;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
    border-radius: 16px;
    border: 1px solid var(--border);
    margin-top: 1rem;
  }

  .nav ul.open {
    display: flex;
  }

  .nav ul {
    gap: 0;
  }

  .nav li {
    padding: 1rem 0;
    border-bottom: 1px solid var(--border);
  }

  .nav li:last-child {
    border-bottom: none;
  }

  .hero {
    padding: 8rem 1.5rem 4rem;
  }

  .cta-buttons {
    flex-direction: column;
    width: 100%;
  }

  .btn {
    width: 100%;
  }

  .product-section,
  .mission-section,
  .company-section,
  .contact-section {
    padding: 5rem 1.5rem;
  }

  .products-grid {
    grid-template-columns: 1fr;
  }

  .product-card {
    padding: 2.5rem;
  }

  .company-grid {
    grid-template-columns: 1fr;
  }
}