@media (max-width: 640px) {

      /*
       * D1: stack meta → date/range (NW is in sticky app brand).
       * Desktop grid is overridden; controls never sit beside meta.
       * History keeps delta slot so height does not jump.
       */
      :root {
        --ds-control-h: 2.75rem; /* ~44pt primary chrome on phone */
      }
      .ds-portfolio-header-primary {
        display: flex;
        flex-direction: column;
        align-items: stretch;
        gap: var(--ds-space-2);
      }
      .ds-portfolio-header-hero-row {
        display: contents;
      }
      .ds-portfolio-header-delta {
        order: 1;
        flex: none;
        width: 100%;
        margin: 0;
      }
      .ds-portfolio-header-actions {
        order: 2;
        align-self: flex-start;
        height: var(--ds-control-h);
        margin-left: 0;
      }
      /* Shared stack on phone: meta → date/range */
      .portfolio-mode-history .ds-portfolio-header-primary,
      .portfolio-mode-overview .ds-portfolio-header-primary {
        gap: var(--ds-space-1);
      }
      .portfolio-mode-history .portfolio-mode-delta {
        display: block;
        visibility: visible;
        min-height: 1.35em;
        order: 1;
        width: 100%;
        margin-top: 0;
      }
      .portfolio-mode-overview .ds-portfolio-header-ledger {
        order: 1;
        width: 100%;
        max-width: 100%;
        margin: 0;
        align-self: stretch;
      }
    }
    @media (max-width: 640px) {      .portfolio-mode-history .ds-portfolio-header-actions.portfolio-mode-history-only,
      .portfolio-mode-overview .ds-portfolio-header-actions.portfolio-mode-snapshot-only {
        align-self: stretch;
        flex-shrink: 0;
        height: auto;
        min-height: 2rem;
        width: 100%;
        margin-left: 0;
        order: 2;
      }
      .portfolio-mode-history .ds-history-header-controls {
        width: 100%;
        align-items: flex-start;
        gap: var(--ds-space-1);
      }
      .portfolio-mode-history .ds-history-range-tabs {
        height: 2rem;
        min-height: 2rem;
        align-items: center;
        width: max-content;
        max-width: 100%;
        align-self: flex-start;
      }
      .ds-app-header .ds-app-tabs {
        height: var(--ds-control-h);
      }
      .ds-user-select {
        min-height: var(--ds-control-h);
        height: var(--ds-control-h);
        box-sizing: border-box;
      }
      #portfolio-panel.portfolio-mode-history .ds-panel-header {
        padding-top: var(--ds-space-1);
        padding-bottom: var(--ds-space-2);
        border-bottom: none;
      }
      #portfolio-panel.portfolio-mode-history #financial-overview-charts.ds-section-body {
        padding-top: 0;
        border-top: none;
        /* Match panel header surface — section tint looked like a rule under the toggle */
        background: var(--ds-surface);
      }

      .ds-snapshot-date-menu {
        left: auto;
        right: 0;
        max-width: min(100vw - 2rem, 16rem);
      }

}