/*
 * Mermaid diagram block styles — TODO-141.
 *
 * Mermaid fences reuse the fenced-code chrome from chat.css:
 *   .code-block-wrapper > .code-block-header + body
 *
 * Diagram-specific layout lives in `.mermaid-block-body` (the same slot as
 * `pre.code-content` for normal code fences):
 *
 *   .mermaid-svg-host > svg   (rendered diagram)
 *   pre.code-content          (source — hidden after render, shown on error)
 *   .mermaid-error-detail     (parse error message)
 *
 * Theme variables are read by mermaid.js at render time.
 */

/* Keep header above diagram paint + pan-zoom transforms (siblings in DOM). */
.mermaid-block.code-block-wrapper {
  position: relative;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  isolation: isolate;
}

.mermaid-block .code-block-header {
  position: relative;
  z-index: 10;
  flex-shrink: 0;
  /* Own compositor layer so transformed SVG cannot paint over the toolbar. */
  transform: translateZ(0);
  /* Opaque bar — semi-transparent bg lets SVG lines show through on pan-up. */
  background: var(--bg-elevated, #252526);
}

.mermaid-block .code-block-actions {
  position: relative;
  z-index: 1;
}

/* Body = code area under the shared header; clip pan-zoom to this box only. */
.mermaid-block-body {
  position: relative;
  z-index: 0;
  flex: 1 1 auto;
  min-height: 0;
  overflow: hidden;
  overflow: clip;
  contain: paint;
}

.mermaid-svg-host {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 12px;
  min-height: 64px;
  overflow: hidden;
  overflow: clip;
  position: relative;
  z-index: 0;
  contain: paint;
  background: var(--code-bg, var(--bg-primary, #1e1e1e));
}

/* Mermaid emits z-index on clusters/nodes; keep the whole graphic under the header.
 * Sizing is handled by normalizeSvgForDisplay inline style (width:<natural>px;
 * max-width:100%) so the SVG never upscales beyond its render resolution. */
.mermaid-block-body .mermaid-svg-host svg {
  position: relative;
  z-index: 0;
  display: block;
  height: auto;
  text-rendering: geometricPrecision;
  shape-rendering: geometricPrecision;
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC",
    -apple-system, system-ui, sans-serif;
}

.mermaid-block-body .mermaid-svg-host svg foreignObject * {
  text-rendering: geometricPrecision;
}

/* Wheel zoom + drag pan (inline + fullscreen viewer) */
.mermaid-panzoom-surface {
  touch-action: none;
  cursor: grab;
  user-select: none;
}

.mermaid-panzoom-surface:active {
  cursor: grabbing;
}

.mermaid-panzoom-canvas {
  display: inline-block;
  transform-origin: 0 0;
  will-change: transform;
  position: relative;
  z-index: 0;
}

.mermaid-viewer-stage.mermaid-panzoom-surface {
  flex: 1;
  position: relative;
  overflow: hidden;
}

/* Rendered: diagram in body, source hidden (copy still via toolbar / data attr) */
.mermaid-block.mermaid-block-rendered .mermaid-block-body pre.mermaid-source-pre {
  display: none;
}

/* Pending — hide body content; loading overlay in the code slot */
.mermaid-block[data-mermaid-pending] .mermaid-block-body .mermaid-svg-host,
.mermaid-block[data-mermaid-pending] .mermaid-block-body pre.mermaid-source-pre {
  display: none !important;
}

.mermaid-block[data-mermaid-pending] .mermaid-block-body::before {
  content: '';
  display: block;
  min-height: 64px;
}

.mermaid-block[data-mermaid-pending] .mermaid-block-body::after {
  content: attr(data-mermaid-loading-label);
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: var(--text-secondary, var(--anypal-fg-muted, #9e9e9e));
  pointer-events: none;
}

/* Error state */
.mermaid-block.mermaid-block-error.code-block-wrapper {
  border-color: var(--anypal-error, #c44545);
}

.mermaid-block.mermaid-block-error .code-block-header {
  background: rgba(196, 69, 69, 0.08);
  color: var(--anypal-error, #c44545);
}

.mermaid-error-line {
  display: inline-block;
  background: rgba(196, 69, 69, 0.18);
  border-left: 2px solid var(--anypal-error, #c44545);
  padding-left: 4px;
  margin-left: -6px;
  width: calc(100% + 6px);
}

.mermaid-error-detail {
  margin: 0;
  padding: 8px 12px;
  background: rgba(196, 69, 69, 0.12);
  color: var(--anypal-error, #c44545);
  font-size: 12px;
  font-weight: 600;
  border-top: 1px solid rgba(196, 69, 69, 0.4);
  white-space: pre-wrap;
  word-break: break-word;
}

.mermaid-block.mermaid-block-error .code-block-header > span {
  color: var(--anypal-error, #c44545);
  font-weight: 600;
}

/* Fullscreen viewer */
.mermaid-viewer-backdrop {
  position: fixed;
  inset: 0;
  z-index: 99998;
  background: rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
}

.mermaid-viewer-modal {
  width: min(96vw, 1200px);
  height: min(92vh, 900px);
  background: var(--anypal-bg, #ffffff);
  border: 1px solid var(--anypal-border, #d4d4d4);
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 18px 64px rgba(0, 0, 0, 0.32);
}

[data-theme="dark"] .mermaid-viewer-modal {
  background: var(--anypal-bg, #1e1e1e);
}

.mermaid-viewer-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 14px;
  border-bottom: 1px solid var(--anypal-border, #d4d4d4);
  background: var(--anypal-muted, rgba(127, 127, 127, 0.08));
}

.mermaid-viewer-title {
  font-weight: 600;
  font-size: 13px;
  color: var(--anypal-fg, #1a1a1a);
}

.mermaid-viewer-actions button {
  appearance: none;
  border: 1px solid transparent;
  background: transparent;
  color: var(--anypal-fg, #1a1a1a);
  font-size: 14px;
  padding: 2px 8px;
  border-radius: 6px;
  cursor: pointer;
  margin-left: 4px;
}

.mermaid-viewer-actions button:hover {
  background: var(--anypal-hover, rgba(127, 127, 127, 0.14));
  border-color: var(--anypal-border, #d4d4d4);
}

.mermaid-viewer-stage {
  flex: 1;
  position: relative;
  overflow: hidden;
  background: var(--anypal-surface, var(--anypal-bg, #ffffff));
  cursor: grab;
  touch-action: none;
}

.mermaid-viewer-stage:active { cursor: grabbing; }

.mermaid-viewer-canvas {
  position: absolute;
  top: 0;
  left: 0;
  transform-origin: 0 0;
  will-change: transform;
}

.mermaid-viewer-canvas svg {
  display: block;
  max-width: none;
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC",
    -apple-system, system-ui, sans-serif;
}