/*
 * 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; }
}

/* --- Notifications ----------------------------------------------------- *
 * House rule: every notice closes, and a stack of them collapses. One notice
 * is a banner; two or more is a <details> group.        pitfalls.md #22     */

.notices {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel-2);
  overflow: hidden;
}

.notices--warn   { border-color: var(--warn); }
.notices--error,
.notices--danger { border-color: var(--danger); }

.notices__summary {
  cursor: pointer;
  padding: var(--space-2) var(--space-3);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-dim);
  list-style: none;          /* the default triangle is not themeable */
  user-select: none;
}

.notices__summary::-webkit-details-marker { display: none; }
.notices__summary::before { content: '\25b8  '; color: var(--text-faint); }
.notices[open] .notices__summary::before { content: '\25be  '; }
.notices__summary:hover { color: var(--text); }

.notices__list { display: flex; flex-direction: column; border-top: 1px solid var(--border); }

.notices__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  font-size: 13px;
  color: var(--text-dim);
}

.notices__item + .notices__item { border-top: 1px solid var(--border); }

.notices__dot {
  width: 7px; height: 7px;
  margin-top: 7px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--text-faint);
}

.notices__item--ok     .notices__dot, .banner--ok     .notices__dot { background: var(--ok); }
.notices__item--warn   .notices__dot, .banner--warn   .notices__dot { background: var(--warn); }
.notices__item--error  .notices__dot, .banner--error  .notices__dot { background: var(--danger); }
.notices__item--danger .notices__dot, .banner--danger .notices__dot { background: var(--danger); }
.notices__item--info   .notices__dot, .banner--info   .notices__dot { background: var(--accent-strong); }

.notices__text, .banner__text { flex: 1 1 auto; min-width: 0; }

/* The X. Generous hit area, quiet until hovered. */
.notices__x {
  flex: 0 0 auto;
  align-self: flex-start;
  background: none;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--text-faint);
  font-size: 17px;
  line-height: 1;
  padding: 2px 6px;
  margin: -2px -4px -2px 0;
}

.notices__x:hover { color: var(--text); background: var(--panel-3); }

/* A lone notice keeps the coloured banner treatment. */
.banner--ok     { background: var(--ok-soft);     border-color: var(--ok); }
.banner--danger { background: var(--danger-soft); border-color: var(--danger); }