/* ===== 响应式 ===== */

/* 平板 */
@media (max-width: 1024px) {
  :root {
    --sidebar-width: 240px;
    --context-sidebar-width: 280px;
  }

  .context-sidebar {
    position: fixed;
    right: 0;
    top: 0;
    bottom: 0;
    z-index: 100;
    transform: translateX(0);
  }

  .context-sidebar.collapsed {
    transform: translateX(100%);
    width: 0;
  }

}

/* 手机 */
@media (max-width: 768px) {
  :root {
    --sidebar-width: 0;
    --context-sidebar-width: 0;
  }

  .sidebar {
    width: 56px !important;
  }

  .sidebar-header .sidebar-search,
  .sidebar-header .btn-new-chat span:not(.icon),
  .session-group-title,
  .session-item .session-item-title,
  .session-item-meta,
  .user-info #usernameDisplay,
  .btn-logout span,
  .btn-logout::after {
    display: none !important;
  }

  .btn-new-chat {
    justify-content: center;
    padding: 10px;
  }

  .btn-new-chat .icon {
    font-size: 20px;
  }

  .session-item {
    padding: 10px;
    text-align: center;
  }

  .user-info {
    justify-content: center;
    padding: 8px;
    gap: 0;
  }

  .user-info .avatar {
    margin: 0;
    width: 28px;
    height: 28px;
  }

  .btn-logout {
    justify-content: center;
    padding: 8px;
  }

  /* 右侧栏改为浮层，不占主区宽度；内含模型与顶栏按钮 */
  .context-sidebar {
    position: fixed;
    right: 0;
    top: 0;
    bottom: 0;
    width: min(92vw, 380px);
    z-index: 100;
    max-width: none;
    border-left: 1px solid var(--border-soft);
  }

  .context-sidebar.collapsed {
    transform: translateX(100%);
    width: min(92vw, 380px);
    border-left: none;
  }

  .chat-header {
    padding: 6px 10px 8px 8px;
    flex-wrap: wrap;
    gap: 6px;
    justify-content: space-between;
    align-items: center;
  }

  .chat-header-model {
    flex: 1 1 100%;
    order: 0;
    max-width: 100%;
  }

  .chat-header-model .model-select-container {
    max-width: none;
    width: 100%;
  }

  .chat-header #modelSelect {
    width: 100%;
    max-width: none;
    min-width: 0;
  }

  .chat-header .header-actions {
    flex: 1 1 100%;
    order: 1;
    justify-content: flex-end;
    flex-wrap: wrap;
  }

  .chat-messages-inner {
    padding: 24px 12px 140px;
  }

  .chat-main--stacked .chat-messages-inner {
    padding: 24px 12px var(--chat-input-offset, 180px);
  }

  .welcome-container {
    min-height: 50vh;
    padding: 20px 12px;
  }

  .welcome-title {
    font-size: 18px;
  }

  .welcome-subtitle {
    font-size: 12px;
    max-width: 260px;
  }

  .welcome-quick-actions {
    margin-top: 16px;
  }

  .quick-action-chip {
    font-size: 11px;
    padding: 6px 10px;
  }

  .message-wrap {
    padding: 14px 0;
    gap: 10px;
  }

  .message-avatar {
    width: 24px;
    height: 24px;
    font-size: 12px;
  }

  .message-bubble {
    padding: 12px 14px;
    font-size: 13.5px;
  }

  .message-bubble pre {
    padding: 10px;
    font-size: 11.5px;
  }

  .input-area-wrapper {
    padding: 0 12px 14px;
  }

  .tool-controls {
    gap: 4px;
  }

  .tool-controls-toggle {
    width: auto;
  }

  .input-main {
    padding: 10px 12px;
  }

  .input-actions {
    padding: 8px 12px;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
  }

  .input-actions-left {
    display: flex;
    flex: 1;
    min-width: 0;
  }

  .input-hint {
    display: none;
  }

  .btn-icon,
  .btn-send {
    height: 32px;
  }

  .btn-send {
    width: 32px;
    min-width: 32px;
    padding: 0;
  }

  .btn-stop {
    width: 32px;
    height: 32px;
    min-width: 32px;
  }

  #messageInput {
    min-height: 44px;
  }

  .btn-icon svg {
    width: 16px;
    height: 16px;
  }
}

/* 小屏手机 */
@media (max-width: 480px) {
  .message-wrap.user .message-bubble {
    max-width: 95%;
  }

  .tool-controls {
    gap: 4px;
  }

}