/*
 * Layout rules that exist because something broke without them.
 * Append to css/layout.css (or import after it). See references/pitfalls.md.
 */

/* --- Nothing in the viewport may shrink -------------------------------- *
 * flex-shrink defaults to 1, so in a short window the column squashes its
 * children - clipping tab text and compressing the diagram - rather than
 * scrolling. The stage grows into spare room; everything else keeps the
 * height its content needs.                                pitfalls.md #2  */

.viewport > * { flex: 0 0 auto; }
.viewport__stage { flex: 1 0 auto; }

/* --- Diagrams draw at natural size ------------------------------------- *
 * Renderers size their viewBox to the contents, so `width: 100%` alone
 * magnifies a small drawing to fill the panel. main.js caps max-width to the
 * viewBox width in px; this centres whatever is narrower.  pitfalls.md #3  */

.viewport__stage svg {
  width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
}

/* --- Tooltips live on <body> ------------------------------------------- *
 * A bubble nested inside the sidebar is clipped by its scroll container no
 * matter how high the z-index. Fixed positioning, set from JS, escapes every
 * clipping context.                                        pitfalls.md #1  */

.info__bubble {
  position: fixed;
  z-index: 300;
  display: none;
  pointer-events: none;
  width: max-content;
  max-width: min(280px, calc(100vw - 24px));
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--text);
  box-shadow: var(--shadow-md);
  font-size: 12px;
  font-weight: 400;
  line-height: 1.45;
  text-align: left;
  letter-spacing: 0;
  text-transform: none;
  white-space: normal;
}

/* --- Header and tab labels shorten before they collide ----------------- *
 * Full labels beside the logo overflow on a phone and the action buttons end
 * up on top of the wordmark. Render both labels; CSS picks one.           */

.btn-label--short, .tab-label--short { display: none; }

.segmented__btn { min-height: 34px; line-height: 1.4; }

@media (max-width: 700px) {
  .btn-label--long { display: none; }
  .btn-label--short { display: inline; }
}

@media (max-width: 620px) {
  .tab-label--long { display: none; }
  .tab-label--short { display: inline; }
  .segmented__btn { padding: 7px 6px; }
}

@media (max-width: 560px) {
  .brand__tool, .brand__sep { display: none; }

  /* Let the logo be the first thing to give way - it is decorative next to
     the controls. */
  .brand { flex: 0 1 auto; min-width: 0; overflow: hidden; }
  .brand__logo {
    height: 22px;
    flex: 0 1 auto;
    min-width: 0;
    object-fit: contain;
    object-position: left center;
  }

  .app-header { gap: var(--space-2); padding: 0 var(--space-3); }
  .header-actions { flex: 0 0 auto; gap: var(--space-1); }
  .header-actions .btn { padding: 6px 8px; }
}