/**
 * Everroux Engineering Workspace — Phase 2 chrome.
 * Collapsible sections, sub-tabs, dockable results, toolbar, dialogs.
 * Requires everroux-density.css tokens. Brand: #1F4E79 / #D97706.
 */

/* ——— Collapsible sections ——— */
.er-section[data-collapsible] > .er-section__title,
.er-section__toggle {
  cursor: pointer;
  user-select: none;
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  border-bottom: 1px solid var(--ui-divider, var(--border, #c5ccc6));
  border-radius: 0;
  color: inherit;
  font: inherit;
  font-size: var(--er-type-section);
  font-weight: var(--er-weight-semibold, 600);
  color: var(--blue, #1f4e79);
  padding: 0 0 2px;
  min-height: var(--er-section-header-height);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.er-section__chevron {
  display: inline-block;
  width: 0.85rem;
  flex: 0 0 auto;
  font-size: 0.7rem;
  line-height: 1;
  color: var(--muted, #4f5b66);
}

.er-section[data-collapsed="true"] > .er-section__body {
  display: none;
}

.er-section[data-collapsed="true"] > .er-section__title .er-section__chevron,
.er-section[data-collapsed="true"] > .er-section__toggle .er-section__chevron {
  transform: rotate(-90deg);
}

/* ——— Sub-tabs ——— */
.er-subtabs {
  display: flex;
  flex-direction: column;
  gap: var(--er-grid-gap);
  min-width: 0;
}

.er-subtabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border-bottom: 1px solid var(--ui-divider, var(--border, #c5ccc6));
  margin: 0;
  padding: 0;
  list-style: none;
}

.er-subtabs__btn {
  margin: 0;
  padding: 0.25rem 0.55rem;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  background: none;
  font: inherit;
  font-size: var(--er-type-label);
  font-weight: var(--er-weight-medium, 500);
  color: var(--muted, #4f5b66);
  cursor: pointer;
  white-space: nowrap;
}

.er-subtabs__btn:hover {
  color: var(--text, #1a2e34);
}

.er-subtabs__btn[aria-selected="true"] {
  color: var(--blue, #1f4e79);
  border-bottom-color: var(--copper, #d97706);
  font-weight: var(--er-weight-semibold, 600);
}

.er-subtabs__panel[hidden] {
  display: none !important;
}

/* ——— Workspace shell (sidebar | main | results) ——— */
.er-workspace {
  display: grid;
  grid-template-columns: var(--er-sidebar-width, 160px) minmax(0, 1fr) var(--er-results-width, 220px);
  grid-template-rows: minmax(0, 1fr);
  gap: var(--er-section-gap);
  align-items: stretch;
  min-height: 0;
}

.er-workspace[data-results-dock="bottom"] {
  grid-template-columns: var(--er-sidebar-width, 160px) minmax(0, 1fr);
  grid-template-rows: minmax(0, 1fr) var(--er-results-height, 180px);
}

.er-workspace[data-results-dock="bottom"] > .er-workspace__results {
  grid-column: 1 / -1;
}

.er-workspace[data-results-dock="collapsed"] {
  grid-template-columns: var(--er-sidebar-width, 160px) minmax(0, 1fr);
}

.er-workspace[data-results-dock="collapsed"] > .er-workspace__results {
  display: none;
}

.er-workspace[data-sidebar-collapsed="true"] {
  grid-template-columns: 0 minmax(0, 1fr) var(--er-results-width, 220px);
}

.er-workspace[data-sidebar-collapsed="true"][data-results-dock="bottom"],
.er-workspace[data-sidebar-collapsed="true"][data-results-dock="collapsed"] {
  grid-template-columns: 0 minmax(0, 1fr);
}

.er-workspace[data-sidebar-collapsed="true"] > .er-workspace__sidebar {
  overflow: hidden;
  opacity: 0;
  pointer-events: none;
  width: 0;
  padding: 0;
  border: none;
  margin: 0;
}

.er-workspace__sidebar,
.er-workspace__main,
.er-workspace__results {
  min-width: 0;
  min-height: 0;
}

/* Major regions: light panel edge (no extra padding — spacing unchanged) */
.er-workspace__sidebar,
.er-workspace__results {
  box-sizing: border-box;
  border: 1px solid var(--ui-border-panel, var(--border, #c5ccc6));
  border-radius: var(--er-radius-dense, 3px);
  background: var(--surface, #fff);
}

.er-workspace__main {
  display: flex;
  flex-direction: column;
  gap: var(--er-section-gap);
}

/* Results dock header */
.er-results {
  display: flex;
  flex-direction: column;
  gap: var(--er-grid-gap);
  min-height: 0;
  height: 100%;
}

.er-results__header {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex-wrap: wrap;
  min-height: var(--er-section-header-height);
  padding-bottom: 2px;
  border-bottom: 1px solid var(--ui-divider, var(--border, #c5ccc6));
}

.er-results__title {
  margin: 0;
  flex: 1 1 auto;
  font-size: var(--er-type-section);
  font-weight: var(--er-weight-semibold, 600);
  color: var(--blue, #1f4e79);
}

.er-results__dock-btns {
  display: inline-flex;
  gap: 2px;
}

.er-results__body {
  flex: 1 1 auto;
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: var(--er-grid-gap);
}

/* Floating results */
.er-workspace[data-results-dock="float"] {
  grid-template-columns: var(--er-sidebar-width, 160px) minmax(0, 1fr);
}

.er-workspace[data-results-dock="float"] > .er-workspace__results {
  position: fixed;
  z-index: 350;
  right: var(--er-page-margin, 8px);
  bottom: var(--er-page-margin, 8px);
  width: min(var(--er-results-float-width, 280px), calc(100vw - 24px));
  max-height: min(50vh, 360px);
  box-shadow: 0 4px 16px rgb(0 0 0 / 0.18);
}

/* ——— Toolbar ——— */
.er-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--er-control-gap, 4px);
  padding: 2px var(--er-card-pad);
  background: var(--surface, #fff);
  border: 1px solid var(--border, #c5ccc6);
  border-radius: var(--er-radius-dense, 3px);
}

.er-toolbar .er-btn,
.er-toolbar__btn {
  height: var(--er-btn-height);
  min-height: var(--er-btn-height);
  padding: 0 0.45rem;
  font-size: var(--er-type-label);
  font-weight: var(--er-weight-regular, 400);
  border-radius: var(--er-radius-dense, 3px);
}

.er-toolbar__sep {
  width: 1px;
  align-self: stretch;
  margin: 2px 4px;
  background: var(--border, #c5ccc6);
}

.er-toolbar__spacer {
  flex: 1 1 auto;
}

/* ——— Compact dialogs ——— */
.er-dialog-backdrop {
  position: fixed;
  inset: 0;
  z-index: 400;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--er-page-margin);
  background: rgb(0 0 0 / 0.4);
  box-sizing: border-box;
}

.er-dialog-backdrop[hidden] {
  display: none !important;
}

.er-dialog {
  position: relative;
  display: flex;
  flex-direction: column;
  width: var(--er-dialog-width, 420px);
  max-width: 100%;
  max-height: min(85vh, 640px);
  background: var(--surface, #fff);
  border: 1px solid var(--ui-border-panel, var(--border, #c5ccc6));
  border-radius: var(--er-radius-dense, 3px);
  box-shadow: 0 8px 28px rgb(0 0 0 / 0.2);
  overflow: hidden;
  resize: both;
}

.er-dialog__header {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  min-height: var(--er-section-header-height);
  padding: 0.25rem 0.5rem;
  background: var(--blue, #1f4e79);
  color: #fff;
  cursor: move;
}

.er-dialog__title {
  margin: 0;
  flex: 1 1 auto;
  font-size: var(--er-type-section);
  font-weight: var(--er-weight-semibold, 600);
}

.er-dialog__close {
  border: 1px solid rgb(255 255 255 / 0.35);
  background: rgb(255 255 255 / 0.12);
  color: #fff;
  height: calc(var(--er-btn-height) - 4px);
  min-width: calc(var(--er-btn-height) - 4px);
  padding: 0 0.35rem;
  border-radius: 2px;
  cursor: pointer;
  font: inherit;
  line-height: 1;
}

.er-dialog__body {
  padding: var(--er-dialog-pad, var(--er-card-pad));
  overflow: auto;
  flex: 1 1 auto;
  font-size: var(--er-type-value);
}

.er-dialog__footer {
  display: flex;
  justify-content: flex-end;
  gap: 0.35rem;
  padding: 0.35rem var(--er-card-pad);
  border-top: 1px solid var(--ui-divider, var(--border, #c5ccc6));
}

/* ——— Phase 3: resizable splitters ——— */
.er-workspace--split {
  display: flex;
  flex-direction: row;
  align-items: stretch;
  gap: 0;
  min-height: 280px;
}

.er-workspace--split > .er-workspace__sidebar {
  flex: 0 0 var(--er-sidebar-width, 160px);
  width: var(--er-sidebar-width, 160px);
  max-width: 40%;
  min-width: 0;
}

.er-workspace--split > .er-workspace__main-col {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--er-section-gap);
}

.er-workspace--split > .er-workspace__results {
  flex: 0 0 var(--er-results-width, 220px);
  width: var(--er-results-width, 220px);
  max-width: 50%;
  min-width: 0;
}

.er-workspace--split[data-results-dock="collapsed"] > .er-workspace__results,
.er-workspace--split[data-results-dock="collapsed"] > .er-splitter[data-splitter="results"] {
  display: none;
}

.er-workspace--split[data-results-dock="bottom"] {
  flex-wrap: wrap;
}

.er-workspace--split[data-results-dock="bottom"] > .er-workspace__results {
  flex: 1 1 100%;
  width: 100%;
  max-width: none;
  height: var(--er-results-height, 180px);
}

.er-workspace--split[data-results-dock="float"] > .er-workspace__results {
  position: fixed;
  z-index: 350;
  right: var(--er-page-margin, 8px);
  bottom: calc(var(--er-statusbar-height, 22px) + var(--er-page-margin, 8px));
  width: min(var(--er-results-float-width, 280px), calc(100vw - 24px));
  max-height: min(50vh, 360px);
  box-shadow: 0 4px 16px rgb(0 0 0 / 0.18);
}

.er-workspace--split[data-results-dock="float"] > .er-splitter[data-splitter="results"] {
  display: none;
}

.er-workspace--split[data-sidebar-collapsed="true"] > .er-workspace__sidebar,
.er-workspace--split[data-sidebar-collapsed="true"] > .er-splitter[data-splitter="sidebar"] {
  display: none;
}

.er-splitter {
  flex: 0 0 5px;
  width: 5px;
  margin: 0;
  padding: 0;
  border: none;
  background: var(--border, #c5ccc6);
  cursor: col-resize;
  align-self: stretch;
}

.er-splitter:hover,
.er-splitter:focus-visible {
  background: var(--copper, #d97706);
  outline: none;
}

.er-splitter--row {
  flex: 0 0 5px;
  width: auto;
  height: 5px;
  cursor: row-resize;
}

.er-workspace--split[data-results-dock="bottom"] > .er-splitter[data-splitter="results"] {
  flex: 0 0 5px;
  width: 100%;
  height: 5px;
  cursor: row-resize;
}

/* ——— Graphics dock (beside inputs) ——— */
.er-main-split {
  display: flex;
  flex-direction: row;
  align-items: stretch;
  gap: 0;
  min-height: 0;
  flex: 1 1 auto;
}

.er-main-split__inputs {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--er-section-gap);
  overflow: auto;
}

.er-main-split__graphics {
  flex: 0 0 var(--er-graphics-width, 260px);
  width: var(--er-graphics-width, 260px);
  max-width: 55%;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--er-grid-gap);
  min-height: var(--er-graphics-min-h, 120px);
}

.er-main-split[data-graphics-dock="bottom"] {
  flex-direction: column;
}

.er-main-split[data-graphics-dock="bottom"] > .er-main-split__graphics {
  flex: 0 0 var(--er-graphics-height, 160px);
  width: auto;
  max-width: none;
  height: var(--er-graphics-height, 160px);
}

.er-main-split[data-graphics-dock="hidden"] > .er-main-split__graphics,
.er-main-split[data-graphics-dock="hidden"] > .er-splitter[data-splitter="graphics"] {
  display: none;
}

.er-graphics {
  display: flex;
  flex-direction: column;
  gap: 2px;
  height: 100%;
  min-height: 0;
}

.er-graphics__header {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  min-height: var(--er-section-header-height);
  border-bottom: 1px solid var(--ui-divider, var(--border, #c5ccc6));
}

.er-graphics__title {
  margin: 0;
  flex: 1 1 auto;
  font-size: var(--er-type-section);
  font-weight: var(--er-weight-semibold, 600);
  color: var(--blue, #1f4e79);
}

.er-graphics__canvas {
  flex: 1 1 auto;
  min-height: 88px;
  background: var(--surface, #fff);
  border: 1px solid var(--ui-border-panel, var(--border, #c5ccc6));
  border-radius: var(--er-radius-dense, 3px);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.er-graphics__canvas svg {
  width: 100%;
  height: 100%;
  max-height: 220px;
}

/* ——— Status bar ——— */
.er-statusbar {
  --er-statusbar-height: 22px;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-height: var(--er-statusbar-height);
  height: var(--er-statusbar-height);
  padding: 0 0.5rem;
  margin: 0;
  background: var(--blue, #1f4e79);
  color: rgb(255 255 255 / 0.92);
  font-size: var(--er-type-fine);
  line-height: 1;
  box-sizing: border-box;
}

.er-statusbar__left,
.er-statusbar__center,
.er-statusbar__right {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.er-statusbar__left {
  flex: 0 1 auto;
}

.er-statusbar__center {
  flex: 1 1 auto;
  justify-content: center;
}

.er-statusbar__right {
  flex: 0 1 auto;
  margin-left: auto;
}

.er-statusbar__sep {
  opacity: 0.45;
}

@media (max-width: 900px) {
  .er-workspace,
  .er-workspace[data-results-dock="bottom"],
  .er-workspace[data-results-dock="collapsed"],
  .er-workspace[data-results-dock="float"],
  .er-workspace[data-sidebar-collapsed="true"],
  .er-workspace--split,
  .er-workspace--split[data-results-dock="bottom"],
  .er-workspace--split[data-results-dock="float"] {
    display: flex;
    flex-direction: column;
    grid-template-columns: 1fr;
    grid-template-rows: auto;
  }

  .er-workspace--split > .er-workspace__sidebar,
  .er-workspace--split > .er-workspace__results,
  .er-workspace--split > .er-workspace__main-col {
    flex: 1 1 auto;
    width: auto !important;
    max-width: none;
  }

  .er-splitter,
  .er-workspace--split > .er-splitter {
    display: none;
  }

  .er-workspace[data-results-dock="float"] > .er-workspace__results,
  .er-workspace--split[data-results-dock="float"] > .er-workspace__results {
    position: static;
    max-height: none;
    width: auto;
    box-shadow: none;
  }

  .er-workspace[data-sidebar-collapsed="true"] > .er-workspace__sidebar {
    display: none;
  }

  .er-main-split {
    flex-direction: column;
  }

  .er-main-split__graphics {
    width: auto !important;
    max-width: none;
  }
}