/* Two fixed panes with a draggable splitter, in the spirit of Compiler
   Explorer: a thin toolbar, no chrome around the work area, and the diagram
   always visible next to the source that produced it. */

:root {
  color-scheme: light dark;

  --background: #ffffff;
  --surface: #f4f5f7;
  --border: #d8dbe0;
  --text: #1c1f24;
  --muted: #6b7280;
  --accent: #2f6feb;
  --error: #c22a2a;
  --error-surface: #fdecec;
  --paper: #ffffff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #16181d;
    --surface: #1e2128;
    --border: #2f333c;
    --text: #e6e8eb;
    --muted: #9aa1ad;
    --accent: #6b9bff;
    --error: #ff8080;
    --error-surface: #3a1f1f;
    /* Diagrams are drawn on their own white ground, so the preview keeps a
       light backdrop even in dark mode rather than inverting the artwork. */
    --paper: #f7f7f8;
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  margin: 0;
}

body {
  display: flex;
  flex-direction: column;
  background: var(--background);
  color: var(--text);
  font: 14px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

/* Toolbar ------------------------------------------------------------- */

.toolbar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 8px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  flex: none;
}

.toolbar h1 {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.toolbar h1 span {
  margin-left: 6px;
  font-weight: 400;
  color: var(--muted);
}

.field {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--muted);
}

.field select {
  font: inherit;
  font-size: 13px;
  color: var(--text);
  background: var(--background);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 3px 6px;
}

.spacer {
  flex: 1;
}

.toolbar button,
.repository {
  font: inherit;
  font-size: 13px;
  color: var(--text);
  background: var(--background);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 4px 10px;
  cursor: pointer;
  text-decoration: none;
}

.toolbar button:hover,
.repository:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Panes --------------------------------------------------------------- */

#panes {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(220px, 40fr) 6px minmax(220px, 60fr);
  min-height: 0;
}

.pane {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
}

.pane-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 5px 12px;
  font-size: 12px;
  color: var(--muted);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex: none;
}

.hint {
  font-style: italic;
  opacity: 0.75;
}

.splitter {
  background: var(--border);
  cursor: col-resize;
}

.splitter:hover {
  background: var(--accent);
}

/* Editor -------------------------------------------------------------- */

.editor {
  flex: 1;
  display: flex;
  min-height: 0;
  overflow: hidden;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
  line-height: 20px;
}

.gutter {
  flex: none;
  padding: 10px 8px 10px 12px;
  text-align: right;
  color: var(--muted);
  background: var(--surface);
  border-right: 1px solid var(--border);
  overflow: hidden;
  user-select: none;
  white-space: pre;
}

.gutter .current {
  color: var(--error);
  font-weight: 700;
}

#source {
  flex: 1;
  padding: 10px 12px;
  border: 0;
  outline: none;
  resize: none;
  font: inherit;
  color: var(--text);
  background: var(--background);
  white-space: pre;
  overflow: auto;
  tab-size: 2;
}

.status {
  flex: none;
  padding: 6px 12px;
  min-height: 30px;
  /* A long list of recovered diagnostics scrolls instead of squeezing the
     editor out of the pane. */
  max-height: 30%;
  overflow: auto;
  font-size: 12px;
  color: var(--muted);
  background: var(--surface);
  border-top: 1px solid var(--border);
  white-space: pre-wrap;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.status.failed {
  color: var(--error);
  background: var(--error-surface);
}

/* Output -------------------------------------------------------------- */

.zoom {
  display: flex;
  gap: 4px;
}

.zoom button {
  font: inherit;
  font-size: 12px;
  min-width: 26px;
  color: var(--text);
  background: var(--background);
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
}

.zoom button:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.preview {
  flex: 1;
  overflow: auto;
  padding: 20px;
  background: var(--paper);
  display: flex;
  align-items: flex-start;
  justify-content: center;
}

.preview img {
  display: block;
  max-width: 100%;
  height: auto;
}

.preview pre {
  margin: 0;
  width: 100%;
  color: #1c1f24;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12.5px;
  line-height: 1.55;
  white-space: pre;
  overflow-x: auto;
}

.preview .empty {
  margin: auto;
  color: #9aa1ad;
  font-style: italic;
}

@media (max-width: 720px) {
  #panes {
    grid-template-columns: none;
    grid-template-rows: 1fr 6px 1fr;
  }

  .splitter {
    cursor: row-resize;
  }
}