@media (max-width: 768px) {
  .app {
    grid-template-columns: 1fr;
    height: 100dvh;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 30;
    width: 85vw;
    max-width: 360px;
    height: 100dvh;
    transform: translateX(-100%);
    transition: transform .18s ease;
    border-right: 1px solid var(--border);
    box-shadow: 18px 0 50px var(--shadow);
    overflow-y: auto;
  }

  .app.sidebar-open .sidebar {
    transform: translateX(0);
  }

  .app.sidebar-open .sidebar-overlay {
    display: block;
  }

  .sidebar-overlay {
    position: fixed;
    inset: 0;
    z-index: 20;
    background: rgba(0, 0, 0, .48);
  }

  .sidebar-toggle,
  .sidebar-close {
    display: inline-flex;
  }

  .sidebar-top {
    grid-template-columns: auto 1fr auto;
    gap: 10px;
  }

  .memory-panel {
    max-height: calc(100dvh - 24px);
  }

  .new-chat {
    min-width: 0;
  }

  .project-row {
    grid-template-columns: 24px 16px minmax(0, 1fr) auto auto auto;
    gap: 4px;
    padding-left: 6px;
    padding-right: 6px;
  }

  .project-chat-list {
    padding-left: 14px;
  }

  .sidebar-menu {
    right: 0;
    max-width: min(250px, calc(85vw - 44px));
  }

  .sidebar-dialog-backdrop {
    align-items: flex-start;
    padding: 12px;
  }

  .sidebar-dialog {
    width: 100%;
    max-height: calc(100dvh - 24px);
  }

  .message {
    max-width: 92%;
  }

  .message.assistant {
    max-width: 100%;
  }

  .image-search-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .image-search-card {
    grid-template-rows: 112px auto auto auto;
    padding: 8px;
  }

  .image-search-preview {
    height: 112px;
  }

  .assistant-copy-block-header {
    align-items: stretch;
  }

  .assistant-copy-block-copy {
    min-height: 38px;
  }

  .message.assistant h1 {
    font-size: 22px;
  }

  .message.assistant h2 {
    font-size: 20px;
  }

  .message.assistant h3 {
    font-size: 18px;
  }

  .assistant-markdown-list {
    padding-left: 20px;
  }

  .assistant-markdown-table {
    min-width: 360px;
  }

  .topbar {
    padding: 0 14px;
  }

  .main {
    height: 100dvh;
  }

  .messages,
  .composer-wrap {
    padding-left: 14px;
    padding-right: 14px;
  }

  .composer-main,
  .file-tray {
    grid-template-columns: 1fr;
  }

  .file-pill {
    width: 100%;
  }

  .composer-actions {
    justify-content: flex-end;
  }
}

@media (max-width: 430px) {
  .image-search-grid {
    grid-template-columns: 1fr;
  }
}