@media (max-width: 1024px) {
  .grid-3,
  .stats-grid,
  .grid-2 {
    grid-template-columns: 1fr;
  }

  .provider-shell,
  .qr-panel {
    grid-template-columns: 1fr;
    display: grid;
  }

  .provider-shell {
    justify-items: stretch;
  }

  .provider-aside {
    max-width: none;
  }
}

@media (max-width: 900px) {
  .nav-toggle {
    display: inline-flex;
  }

  .nav-menu {
    position: absolute;
    left: 16px;
    right: 16px;
    top: calc(100% + 10px);
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    padding: 14px;
    border-radius: 18px;
    border: 1px solid var(--color-border);
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
  }

  .site-header.is-open .nav-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .nav-link,
  .btn-nav {
    width: 100%;
  }
}

@media (max-width: 768px) {
  .container {
    width: min(var(--container-width), calc(100% - 20px));
  }

  .page-shell {
    padding: 24px 0 48px;
  }

  .provider-banner {
    padding-top: 16px;
  }

  .provider-shell,
  .surface-card,
  .card,
  .form-card,
  .metric-card,
  .stat-card {
    padding: 20px;
    border-radius: 18px;
  }

  .provider-profile {
    flex-direction: column;
    align-items: flex-start;
  }

  .provider-avatar,
  .provider-avatar--placeholder {
    width: 72px;
    height: 72px;
  }

  .btn-grid,
  .action-grid,
  .metric-grid,
  .hero-actions,
  .inline-actions {
    grid-template-columns: 1fr;
    display: grid;
  }

  .hero-actions .btn,
  .hero-actions .btn-green,
  .hero-actions .btn-red,
  .inline-actions .btn,
  .inline-actions .btn-green,
  .inline-actions .btn-red {
    width: 100%;
  }

  table {
    min-width: 560px;
  }
}

@media (max-width: 520px) {
  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.6rem;
  }

  h3 {
    font-size: 1.25rem;
  }

  .brand-copy small {
    display: none;
  }

  .provider-meta {
    flex-direction: column;
    align-items: stretch;
  }

  .email-prefix-group {
    flex-direction: column;
    align-items: stretch;
  }

  .email-prefix-suffix {
    text-align: center;
  }
}