/* ===== Variables ===== */
:root {
  --bg-dark: #0a0e17;
  --bg-card: #131a2b;
  --bg-card-hover: #1a2438;
  --bg-section-alt: #0f1520;
  --text-primary: #f0f4f8;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #f59e0b;
  --accent-hover: #d97706;
  --accent-glow: rgba(245, 158, 11, 0.25);
  --border: rgba(148, 163, 184, 0.12);
  --border-hover: rgba(245, 158, 11, 0.35);
  --navbar-height: 72px;
  --radius: 16px;
  --radius-sm: 10px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.45);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--navbar-height);
}

body {
  font-family: "Noto Sans JP", "Segoe UI", system-ui, sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}

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

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

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

address {
  font-style: normal;
  margin: 0;
  color: var(--text-secondary);
  line-height: 1.8;
}

::selection {
  background: var(--accent);
  color: var(--bg-dark);
}

/* ===== Navbar ===== */
.navbar {
  background: rgba(10, 14, 23, 0.75);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  padding: 0.85rem 0;
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.navbar.scrolled {
  background: rgba(10, 14, 23, 0.95);
  border-bottom-color: var(--border);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

.navbar-brand {
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--text-primary) !important;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  letter-spacing: 0.02em;
}

.brand-icon {
  font-size: 1.2rem;
}

.navbar-toggler {
  border-color: var(--border);
  padding: 0.4rem 0.6rem;
}

.navbar-toggler:focus {
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.navbar-toggler-icon {
  filter: invert(1);
}

.nav-link {
  color: var(--text-secondary) !important;
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.5rem 1rem !important;
  position: relative;
  transition: color var(--transition);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0.15rem;
  left: 1rem;
  right: 1rem;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform var(--transition);
  border-radius: 2px;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary) !important;
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
}

@media (max-width: 991.98px) {
  .navbar-collapse {
    background: var(--bg-card);
    border-radius: var(--radius-sm);
    padding: 1rem;
    margin-top: 0.75rem;
    border: 1px solid var(--border);
  }

  .nav-link::after {
    display: none;
  }
}

/* ===== Buttons ===== */
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  border: none;
  color: var(--bg-dark);
  font-weight: 600;
  padding: 0.75rem 1.75rem;
  border-radius: 50px;
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
}

.btn-primary:hover,
.btn-primary:focus {
  background: linear-gradient(135deg, var(--accent-hover), #b45309);
  color: var(--bg-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--accent-glow);
}

.btn-outline-light {
  border: 2px solid rgba(255, 255, 255, 0.35);
  color: var(--text-primary);
  font-weight: 600;
  padding: 0.75rem 1.75rem;
  border-radius: 50px;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
}

.btn-outline-light:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.6);
  color: var(--text-primary);
  transform: translateY(-2px);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    linear-gradient(160deg, rgba(10, 14, 23, 0.88) 0%, rgba(10, 14, 23, 0.65) 50%, rgba(10, 14, 23, 0.92) 100%),
    url("https://images.unsplash.com/photo-1450778869180-41d0601e046e?w=1920&q=80") center / cover no-repeat;
  padding: calc(var(--navbar-height) + 3rem) 0 5rem;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 30% 50%, rgba(245, 158, 11, 0.08) 0%, transparent 60%);
  pointer-events: none;
}

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

.hero-badge {
  display: inline-block;
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.4rem 1.1rem;
  border-radius: 50px;
  border: 1px solid rgba(245, 158, 11, 0.3);
  margin-bottom: 1.5rem;
  letter-spacing: 0.04em;
}

.hero-title {
  font-size: clamp(2rem, 5.5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 1.25rem;
  letter-spacing: 0.02em;
}

.hero-lead {
  font-size: clamp(1rem, 2.2vw, 1.15rem);
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto 2rem;
  line-height: 1.85;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

.hero-scroll-hint {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  opacity: 0.6;
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--text-muted), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; transform: scaleY(0.6); }
  50% { opacity: 1; transform: scaleY(1); }
}

/* ===== Sections ===== */
.section {
  padding: 6rem 0;
}

.section-label {
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 1.25rem;
  line-height: 1.3;
}

.section-subtitle {
  color: var(--text-secondary);
  max-width: 560px;
  font-size: 1.05rem;
}

.section-text {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  font-size: 1rem;
}

.text-accent {
  color: var(--accent);
}

/* ===== About ===== */
.about-section {
  background: var(--bg-section-alt);
}

.about-image-wrap {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
}

.about-image {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius);
  transition: transform 0.6s ease;
}

.about-image-wrap:hover .about-image {
  transform: scale(1.03);
}

.about-image-accent {
  position: absolute;
  bottom: -12px;
  right: -12px;
  width: 60%;
  height: 60%;
  border: 3px solid var(--accent);
  border-radius: var(--radius);
  z-index: -1;
  opacity: 0.5;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1.25rem 1rem;
  text-align: center;
  transition: border-color var(--transition), transform var(--transition);
}

.stat-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-3px);
}

.stat-number {
  display: block;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.2;
}

.stat-label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* ===== Services ===== */
.services-section {
  background: var(--bg-dark);
}

.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  height: 100%;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.service-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-hover);
}

.service-image-wrap {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
}

.service-image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.service-card:hover .service-image-wrap img {
  transform: scale(1.08);
}

.service-icon {
  position: absolute;
  bottom: 12px;
  right: 12px;
  width: 44px;
  height: 44px;
  background: rgba(10, 14, 23, 0.85);
  backdrop-filter: blur(8px);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  border: 1px solid var(--border);
}

.service-body {
  padding: 1.5rem;
}

.service-title {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
  color: var(--text-primary);
}

.service-desc {
  color: var(--text-secondary);
  font-size: 0.92rem;
  margin: 0;
  line-height: 1.75;
}

/* ===== Contact ===== */
.contact-section {
  background: var(--bg-section-alt);
}

.contact-info {
  margin-top: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.contact-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.contact-icon {
  font-size: 1.25rem;
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.contact-label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: 0.2rem;
  letter-spacing: 0.04em;
}

.contact-item a {
  color: var(--text-primary);
  font-weight: 500;
}

.contact-item a:hover {
  color: var(--accent);
}

.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow);
}

.form-label {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 0.4rem;
}

.form-control {
  background: var(--bg-dark);
  border: 1px solid var(--border);
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-control::placeholder {
  color: var(--text-muted);
}

.form-control:focus {
  background: var(--bg-dark);
  border-color: var(--accent);
  color: var(--text-primary);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

/* ===== Footer ===== */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  background: var(--bg-dark);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.footer-brand {
  font-weight: 700;
  color: var(--text-primary);
  font-size: 1.1rem;
}

.footer-brand:hover {
  color: var(--accent);
}

.footer-copy {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin: 0;
}

/* ===== Animations ===== */
.fade-up {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children in service grid */
.services-section .row > [class*="col"]:nth-child(1) .fade-up { transition-delay: 0.05s; }
.services-section .row > [class*="col"]:nth-child(2) .fade-up { transition-delay: 0.1s; }
.services-section .row > [class*="col"]:nth-child(3) .fade-up { transition-delay: 0.15s; }
.services-section .row > [class*="col"]:nth-child(4) .fade-up { transition-delay: 0.2s; }
.services-section .row > [class*="col"]:nth-child(5) .fade-up { transition-delay: 0.25s; }
.services-section .row > [class*="col"]:nth-child(6) .fade-up { transition-delay: 0.3s; }

/* ===== Responsive ===== */
@media (max-width: 767.98px) {
  .section {
    padding: 4rem 0;
  }

  .hero {
    min-height: 90vh;
    padding-bottom: 4rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .hero-scroll-hint {
    display: none;
  }

  .contact-form {
    padding: 1.5rem;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }

  .about-image-accent {
    display: none;
  }
}

@media (max-width: 575.98px) {
  :root {
    --navbar-height: 64px;
  }

  .stat-card {
    padding: 1rem 0.75rem;
  }

  .stat-number {
    font-size: 1.4rem;
  }
}