@media (max-width: 980px) {
  .page-content {
    padding: 0 18px;
  }

  .browser-shell {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .browser-sidebar {
    position: static;
    gap: 12px;
  }

  .browser-sidebar-copy {
    gap: 4px;
  }

  .section-nav {
    overflow-x: auto;
    padding-bottom: 4px;
    scrollbar-width: none;
    cursor: grab;
    user-select: none;
  }

  .section-nav::-webkit-scrollbar {
    display: none;
  }

  .section-nav.is-dragging {
    cursor: grabbing;
  }

  .section-nav-list {
    display: flex;
    flex-wrap: nowrap;
    width: max-content;
  }

  .section-nav-button {
    width: auto;
    white-space: nowrap;
  }
}

@media (max-width: 820px) {
  body {
    padding-top: 132px;
  }

  .header-content {
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
  }

  .main-nav ul {
    gap: 12px;
    flex-wrap: wrap;
    justify-content: flex-start;
  }

  .browser-stage,
  .page-panel {
    padding: 20px 18px;
    border-radius: 16px;
  }

  .welcome-block {
    padding: 16px;
  }

  .welcome-card-grid {
    grid-template-columns: 1fr;
  }

  .welcome-card-grid--wide {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  body {
    padding-top: 148px;
  }

  .header-content {
    padding-inline: 14px;
  }

  .site-title {
    font-size: 1.2rem;
  }

  .main-nav ul {
    gap: 8px;
  }

  .browser-stage {
    padding: 18px 16px;
    border-radius: 14px;
  }

  .section-nav-button {
    font-size: 0.9rem;
    padding: 7px 12px;
  }

  .page-content {
    padding: 0 14px;
  }

  .page-title {
    font-size: clamp(1.7rem, 8vw, 2.1rem);
  }

  .page-intro,
  .browser-sidebar-text {
    font-size: 0.95rem;
  }

  .home-info-grid,
  .social-link-grid {
    grid-template-columns: 1fr;
  }

  .welcome-block {
    padding: 14px;
    gap: 12px;
  }

  .accordion-header,
  .accordion-header.nested {
    padding-inline: 16px;
  }

  .accordion-content.open {
    padding-inline: 16px;
  }

  .accordion-content.nested.open {
    padding-inline: 14px;
  }
}