@media (max-width: 767px) {
  body { margin-top: 0; }
  header { position: static; padding: 12px 0 0; border-bottom: 1px solid #eee; }
  header .container { max-width: none; width: calc(100% - 32px); flex-direction: column; align-items: center; gap: 8px; }
  header .logo { width: 160px; height: 36px; }
  header nav { width: 100%; max-width: 480px; }
  header nav ul { padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); }
  header nav ul li + li { margin-left: 0; }
  header nav ul li a { display: flex; align-items: center; justify-content: center; min-height: 44px; padding: 8px 4px; font-size: 14px; line-height: 1.5; }
  header nav ul li a.active { color: #8a642c; border-bottom: 2px solid #e1b264; }

  .gold-title { font-size: 20px; }

  .about .about-section { flex-direction: column; max-width: none; width: calc(100% - 32px); padding: 28px 0 36px; }
  .about .building { width: 100%; height: calc((100vw - 32px) * 0.6218); margin: 0 0 20px; }
  .about .about-section .title { margin-bottom: 12px; }
  .about .about-section .content { font-size: 15px; line-height: 1.8; }
  .about .about-section .contact { width: 140px; height: auto; min-height: 44px; margin-top: 24px; border-radius: 10px; font-size: 16px; }

  .contact-section { padding: 28px 0 36px; }
  .contact-section .container { max-width: none; width: calc(100% - 32px); }
  .contact-section form { max-width: none; margin-top: 16px; }
  .form-control + .form-control { margin-top: 12px; }
  .form-control input,
  .form-control textarea { font-size: 16px; line-height: 1.5; padding: 10px 20px; border-radius: 24px; }
  .form-control input { min-height: 44px; }
  .form-control textarea { border-radius: 16px; }
  .contact-section form button { width: 140px; height: 44px; margin-top: 20px; border-radius: 10px; font-size: 16px; }

  footer { padding: 24px 20px; font-size: 12px; line-height: 1.8; text-align: center; }
  footer nav.container { max-width: none; width: 100%; margin-bottom: 12px !important; }
  footer nav ul { padding: 0; display: flex; flex-wrap: wrap; justify-content: center; gap: 0 8px; }
  footer nav ul li + li { margin-left: 0; }
  footer nav ul li a { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 8px 4px; font-size: 14px; }
  footer > div { max-width: 100%; overflow-wrap: anywhere; }
  footer > div + div { margin-top: 8px; }
  footer .links a { display: inline-flex; align-items: center; min-height: 44px; padding: 6px 4px; color: #8a642c; }
  footer .beian a { display: inline-flex; align-items: center; min-height: 44px; padding: 6px 4px; }
  a:focus-visible { outline: 2px solid #a37c3c; outline-offset: 3px; }
}