@media (max-width: 1100px) {
  :root { --container: 960px; }
  .nav a { padding-inline: 9px; font-size: .82rem; }
  .header-actions .btn { display: none; }
  .hero-grid { gap: 44px; }
  .hero-stamp { left: -28px; width: 112px; height: 112px; }
  .footer-grid { grid-template-columns: 1.2fr .8fr .8fr; }
  .footer-grid > :last-child { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  :root { --header-h: 70px; }
  .topbar-inner { min-height: 34px; }
  .topbar-list.secondary { display: none; }
  .site-header { background: #fff9ed; }
  .menu-toggle { display: inline-flex; }
  .nav {
    position: fixed; inset: calc(34px + var(--header-h)) 0 0 0; z-index: 1190;
    display: flex; flex-direction: column; align-items: stretch; gap: 0;
    background: #fff9ed; padding: 22px 20px 34px; overflow-y: auto;
    transform: translateX(100%); visibility: hidden; transition: transform .35s var(--ease), visibility .35s;
    border-top: 1px solid var(--line); box-shadow: -18px 28px 45px rgba(11,23,34,.16);
  }
  .nav.open { transform: translateX(0); visibility: visible; }
  .nav a { padding: 16px 4px; border-bottom: 1px solid var(--line); font-size: 1rem; }
  .nav a::after { display: none; }
  .nav a.active { color: var(--sun-deep); }
  .hero { min-height: auto; padding-top: 58px; }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-copy { max-width: 760px; }
  .hero-media { justify-self: center; width: min(100%, 480px); }
  .hero-video-shell video { aspect-ratio: auto; }
  .trust-grid { grid-template-columns: repeat(2, 1fr); }
  .trust-item:nth-child(2) { border-right: 0; }
  .trust-item:nth-child(-n+2) { border-bottom: 1px solid rgba(255,255,255,.1); }
  .split { grid-template-columns: 1fr; gap: 46px; }
  .experience-card:nth-child(n) { grid-column: span 6; }
  .feature-band .split { gap: 0; }
  .feature-copy { padding: 70px 0 54px; }
  .feature-photo { margin: 0 -20px; min-height: auto; }
  .process-grid { grid-template-columns: repeat(2,1fr); }
  .process-step:nth-child(2) { border-right: 0; }
  .process-step:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .equipment-panel { grid-template-columns: 1fr; }
  .equipment-panel .copy { padding: 42px; }
  .contact-grid { grid-template-columns: 1fr; }
  .service-detail { grid-template-columns: 180px 1fr; gap: 36px; }
  .service-detail-main { grid-template-columns: 1fr; }
  .equipment-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1.2fr .8fr; }
  .footer-grid > :last-child { grid-column: auto; }
}

@media (max-width: 680px) {
  .container, .narrow { width: min(calc(100% - 30px), var(--container)); }
  .section { padding: 78px 0; }
  .section-sm { padding: 58px 0; }
  h1 { font-size: clamp(2.65rem, 15vw, 4.8rem); }
  h2 { font-size: clamp(2.15rem, 11vw, 3.5rem); }
  .topbar-note { font-size: .74rem; }
  .topbar-list { gap: 12px; }
  .brand img { width: 42px; height: 42px; }
  .brand-name { font-size: 1.12rem; }
  .brand-tag { font-size: .55rem; }
  .hero { padding: 42px 0 70px; }
  .hero-grid { gap: 40px; }
  .hero-copy .lead { font-size: 1rem; }
  .hero-stamp { position: static; width: auto; height: auto; border: 0; border-radius: 8px; transform: none; margin-top: 10px; padding: 12px 16px; display: block; }
  .hero-flight-line { display: none; }
  .hero-video-shell { border-radius: 28px 28px 8px 28px; padding: 9px; }
  .hero-video-shell video { border-radius: 20px 20px 5px 20px; }
  .trust-grid { grid-template-columns: 1fr; }
  .trust-item { border-right: 0; border-bottom: 1px solid rgba(255,255,255,.1); padding: 18px 20px; min-height: 80px; }
  .trust-item:last-child { border-bottom: 0; }
  .experience-grid { grid-template-columns: 1fr; }
  .experience-card:nth-child(n) { grid-column: auto; min-height: 280px; padding: 26px; }
  .experience-card h3 { margin-top: 44px; }
  .stats { grid-template-columns: 1fr; }
  .stat { border-right: 0; border-bottom: 1px solid var(--line); padding: 28px; }
  .stat:last-child { border-bottom: 0; }
  .process-grid { grid-template-columns: 1fr; }
  .process-step { border-right: 0; border-bottom: 1px solid var(--line); }
  .process-step:last-child { border-bottom: 0; }
  .special-grid { grid-template-columns: 1fr; grid-template-rows: auto; }
  .special-card:first-child { grid-row: auto; }
  .special-label { position: static; margin-top: 8px; }
  .equipment-panel .copy { padding: 32px 24px; }
  .expect-grid { grid-template-columns: 1fr; }
  .cta-banner { padding: 46px 24px; }
  .form-card { padding: 26px 20px; }
  .form-grid { grid-template-columns: 1fr; }
  .field.full { grid-column: auto; }
  .map-shell iframe { min-height: 340px; }
  .page-hero { padding: 68px 0 60px; }
  .page-hero h1 { font-size: clamp(2.55rem, 13vw, 4.2rem); }
  .service-detail { grid-template-columns: 1fr; gap: 22px; padding: 44px 0; }
  .service-index { font-size: 2.8rem; }
  .equipment-grid { grid-template-columns: 1fr; }
  .gallery-grid { columns: 1; }
  .footer-grid { grid-template-columns: 1fr; gap: 36px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .float-actions { right: 12px; bottom: 12px; }
  .float-btn { width: 50px; height: 50px; }
  .float-tooltip { display: none; }
  .back-to-top { left: 12px; bottom: 14px; }
}

@media (max-width: 390px) {
  .container, .narrow { width: min(calc(100% - 24px), var(--container)); }
  .topbar-list a:last-child { display: none; }
  .brand-tag { display: none; }
  .btn { width: 100%; }
  .header-actions .menu-toggle { width: 46px; }
  .btn-row { display: grid; grid-template-columns: 1fr; }
  .hero-note { align-items: flex-start; }
  .feature-photo { margin-inline: -12px; }
  .form-actions .btn { width: 100%; }
}

@media (max-width: 680px) {
  .media-frame::after { right: 0; bottom: 0; }
}