.mega-menu {
  width: min(1080px, calc(100vw - 48px));
  left: 50%;
  display: grid;
  grid-template-columns: 270px repeat(3, minmax(150px, 1fr));
  gap: 0 1rem;
  padding: 1.5rem;
  transform: translateX(-50%) translateY(-6px);
  border-top: 3px solid var(--aqua);
  box-shadow: 0 18px 40px rgba(16, 34, 46, 0.2);
}
.nav-group.is-open .mega-menu {
  transform: translateX(-50%) translateY(0);
}
.mega-intro {
  grid-row: span 2;
  padding: 1rem 1.15rem;
  background: #eef9fb;
  border-right: 1px solid var(--line);
}
.mega-intro h2 {
  font: 2rem/1.05 var(--serif);
  margin: 0 0 0.65rem;
}
.mega-intro p {
  font-size: 0.9rem;
  line-height: 1.45;
  color: var(--muted);
}
.mega-intro .button {
  margin-top: 0.8rem;
  padding: 0.62rem 0.8rem;
}
.mega-link {
  min-height: 82px !important;
  display: flex !important;
  align-items: flex-start;
  gap: 0.7rem;
  padding: 0.8rem !important;
  margin: 0 !important;
  border-bottom: 1px solid #edf1f1;
}
.mega-link:hover {
  background: #f3fbfc !important;
}
.mega-icon {
  display: grid;
  place-items: center;
  flex: 0 0 30px;
  width: 30px;
  height: 30px;
  background: var(--aqua);
  color: var(--blue);
  font-weight: 900;
  border-radius: 6px;
}
.mega-copy {
  display: block;
}
.mega-copy strong {
  display: block;
  font-size: 0.92rem;
  color: var(--ink);
  margin-bottom: 0.15rem;
}
.mega-copy small {
  display: block;
  font-size: 0.78rem;
  line-height: 1.3;
  color: var(--muted);
  font-weight: 400;
}
.service-detail-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}
.service-detail {
  background: var(--white);
  border: 1px solid var(--line);
  padding: 1.5rem;
}
.service-detail h3 {
  font-size: 1.35rem;
}
.service-detail p {
  font-size: 0.95rem;
  color: var(--muted);
}
.service-detail a {
  font-weight: 800;
  color: var(--blue);
}
.service-process {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
  counter-reset: step;
}
.service-process article {
  padding: 1.4rem;
  background: #e8f1f0;
}
.service-process article:before {
  counter-increment: step;
  content: "0" counter(step);
  display: block;
  font-weight: 900;
  letter-spacing: 0.1em;
  color: var(--blue);
  margin-bottom: 0.7rem;
}
@media (max-width: 800px) {
  .mega-menu {
    position: static;
    display: none;
    width: auto;
    min-width: 0;
    grid-template-columns: 1fr;
    gap: 0;
    margin: 0.35rem 0 0.2rem 0.3rem;
    padding: 0.55rem;
    transform: none;
    box-shadow: none;
    border: 1px solid var(--line);
    border-left: 3px solid var(--aqua);
  }
  .nav-group.is-open .mega-menu {
    display: grid;
    transform: none;
  }
  .mega-intro {
    grid-row: auto;
    padding: 0.9rem;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .mega-intro h2 {
    font-size: 1.4rem;
  }
  .mega-link {
    min-height: 0 !important;
  }
  .service-detail-grid,
  .service-process {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 801px) {
  .site-nav .mega-menu {
    display: grid;
    position: fixed;
    top: 80px;
    left: 50%;
    width: min(1080px, calc(100vw - 2rem));
    max-height: calc(100vh - 96px);
    overflow-y: auto;
    overscroll-behavior: contain;
    grid-template-columns: minmax(190px, 0.9fr) repeat(3, minmax(0, 1fr));
  }
}