/* ==========================================================================
   Reset & Base Styles
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  /* Color Palette */
  --color-primary: #0f172a;       /* Slate 900 */
  --color-primary-light: #1e293b; /* Slate 800 */
  --color-accent: #3b82f6;        /* Blue 500 */
  --color-accent-hover: #2563eb;  /* Blue 600 */
  --color-accent-glow: rgba(59, 130, 246, 0.15);
  --color-text-main: #334155;     /* Slate 700 */
  --color-text-muted: #64748b;    /* Slate 500 */
  --color-bg-main: #f8fafc;       /* Slate 50 */
  --color-bg-card: #ffffff;
  --color-border: #e2e8f0;        /* Slate 200 */
  
  /* Gradients */
  --grad-hero: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  --grad-accent: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
  
  /* Fonts */
  --font-sans: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  
  /* Layout */
  --container-max-width: 1100px;
  --header-height: 80px;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text-main);
  background-color: var(--color-bg-main);
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

/* ==========================================================================
   Layout Containers
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.section-padding {
  padding-top: 6rem;
  padding-bottom: 6rem;
}

@media (max-width: 768px) {
  .section-padding {
    padding-top: 4rem;
    padding-bottom: 4rem;
  }
}

/* Section Common Header */
.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-title-en {
  display: block;
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.section-title-jp {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary);
  position: relative;
  display: inline-block;
  padding-bottom: 0.75rem;
}

.section-title-jp::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 3px;
  background: var(--grad-accent);
  border-radius: 2px;
}

/* ==========================================================================
   Header Navigation
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background-color: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  display: flex;
  align-items: center;
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  flex-direction: column;
}

.logo-main {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-primary);
}

.logo-sub {
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-top: -2px;
}

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

.nav-link {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text-main);
  position: relative;
  padding: 0.5rem 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--grad-accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-normal);
}

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

.nav-link:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

@media (max-width: 768px) {
  .nav-list {
    gap: 1.25rem;
  }
  .nav-link {
    font-size: 0.85rem;
  }
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
  min-height: 85vh;
  background: var(--grad-hero);
  color: #ffffff;
  display: flex;
  align-items: center;
  position: relative;
  padding-top: var(--header-height);
  overflow: hidden;
}

/* Subtle background grid effect */
.hero-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}

/* Abstract blob decoration */
.hero-section::after {
  content: '';
  position: absolute;
  width: 500px;
  height: 500px;
  top: -10%;
  right: -10%;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.12) 0%, rgba(0, 0, 0, 0) 70%);
  border-radius: 50%;
  filter: blur(50px);
  pointer-events: none;
}

.hero-content {
  max-width: 720px;
  position: relative;
  z-index: 2;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  padding: 0.35rem 1rem;
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  margin-bottom: 2rem;
  backdrop-filter: blur(4px);
}

.hero-tag-dot {
  width: 6px;
  height: 6px;
  background-color: var(--color-accent);
  border-radius: 50%;
  margin-right: 8px;
  box-shadow: 0 0 8px var(--color-accent);
}

.hero-title {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin-bottom: 1.5rem;
}

.hero-title span {
  background: var(--grad-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-lead {
  font-size: 1.125rem;
  color: #94a3b8; /* Slate 400 */
  line-height: 1.75;
  margin-bottom: 3rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 2rem;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  transition: all var(--transition-normal);
  cursor: pointer;
}

.btn-primary {
  background: var(--grad-accent);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #ffffff;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

@media (max-width: 768px) {
  .hero-section {
    min-height: 70vh;
    padding-top: calc(var(--header-height) + 2rem);
  }
  .hero-title {
    font-size: 2.25rem;
  }
  .hero-lead {
    font-size: 1rem;
    margin-bottom: 2rem;
  }
  .hero-actions {
    flex-direction: column;
  }
  .btn {
    width: 100%;
  }
}

/* ==========================================================================
   Services Section
   ========================================================================== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.service-card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  padding: 3rem 2.25rem;
  border-radius: 12px;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--grad-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-normal);
}

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.05);
  border-color: rgba(59, 130, 246, 0.2);
}

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

.service-icon-wrapper {
  width: 48px;
  height: 48px;
  background-color: var(--color-accent-glow);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.75rem;
  color: var(--color-accent);
}

.service-icon {
  font-size: 1.5rem;
}

.service-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.service-description {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

@media (max-width: 992px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .services-grid {
    grid-template-columns: 1fr;
  }
  .service-card {
    padding: 2.25rem 1.75rem;
  }
}

/* ==========================================================================
   Company Profile Section
   ========================================================================== */
.company-section {
  background-color: #ffffff;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.company-table-wrapper {
  max-width: 800px;
  margin: 0 auto;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.02);
}

.profile-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.profile-table tr {
  border-bottom: 1px solid var(--color-border);
}

.profile-table tr:last-child {
  border-bottom: none;
}

.profile-table th, 
.profile-table td {
  padding: 1.5rem 2rem;
  font-size: 0.95rem;
}

.profile-table th {
  width: 25%;
  font-weight: 700;
  color: var(--color-primary);
  background-color: var(--color-bg-main);
  border-right: 1px solid var(--color-border);
  vertical-align: top;
}

.profile-table td {
  color: var(--color-text-main);
}

.profile-value-list {
  list-style: none;
}

.profile-value-list li {
  position: relative;
  padding-left: 1.25rem;
  margin-bottom: 0.5rem;
}

.profile-value-list li:last-child {
  margin-bottom: 0;
}

.profile-value-list li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: bold;
}

@media (max-width: 768px) {
  .profile-table th, 
  .profile-table td {
    padding: 1.25rem 1.25rem;
  }
  .profile-table th {
    width: 100%;
    display: block;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 0.5rem;
  }
  .profile-table td {
    width: 100%;
    display: block;
    padding-top: 0.75rem;
  }
}

/* ==========================================================================
   Contact Section
   ========================================================================== */
.contact-card {
  max-width: 700px;
  margin: 0 auto;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 3.5rem 3rem;
  text-align: center;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.03);
}

.contact-intro {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  margin-bottom: 2.5rem;
}

.contact-info-list {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.contact-info-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1.5rem;
  background-color: var(--color-bg-main);
  border-radius: 8px;
  width: 100%;
  max-width: 450px;
  border: 1px solid var(--color-border);
  transition: all var(--transition-normal);
}

.contact-info-item:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 12px var(--color-accent-glow);
}

.contact-label {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}

.contact-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
}

.contact-note {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: 2.5rem;
}

@media (max-width: 768px) {
  .contact-card {
    padding: 2.5rem 1.5rem;
  }
  .contact-value {
    font-size: 1.1rem;
  }
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background-color: var(--color-primary);
  color: #94a3b8; /* Slate 400 */
  padding: 3rem 0;
  margin-top: auto;
  border-top: 1px solid var(--color-primary-light);
  font-size: 0.9rem;
}

.footer-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-logo {
  font-weight: 700;
  color: #ffffff;
}

.copyright {
  font-size: 0.8rem;
}

@media (max-width: 768px) {
  .footer-container {
    flex-direction: column;
    gap: 1.5rem;
    text-align: center;
  }
}