/* ==========================================================================
   Pathfinding on Energy Landscapes — presentation layer.

   Same design language as particle-life: chrome inherits the PaperMod theme
   variables; the viewport is a fixed dark instrument window in both themes.
   ========================================================================== */

.sim-mount {
  --sim-width: min(1024px, calc(100vw - 2 * var(--gap, 24px)));
  width: var(--sim-width);
  margin-left: calc((100% - var(--sim-width)) / 2);
  margin-block: calc(1.5 * var(--content-gap, 20px));
}

.sim-noscript {
  padding: 1rem;
  border: 1px solid var(--border, #e6e6e6);
  border-radius: var(--radius, 8px);
}

.pf {
  --pf-fg: var(--content, #1e1e1e);
  --pf-muted: var(--secondary, #6c6c6c);
  --pf-border: var(--border, #e6e6e6);
  --pf-field: var(--code-bg, #f5f5f5);
  --pf-accent: var(--purple, #8e7bd0);
  --pf-accent-strong: var(--lightpurple, #5e42bc);
  --pf-ink: #0b0d12;
  --pf-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  border: 1px solid var(--pf-border);
  border-radius: var(--radius, 8px);
  overflow: hidden;
  background: var(--entry, #fff);
  color: var(--pf-fg);
  font-size: 0.875rem;
  line-height: 1.4;
}

/* ---------- viewport ---------------------------------------------------- */

.pf-stage {
  position: relative;
  background: var(--pf-ink);
  line-height: 0;
}

.pf-canvas {
  display: block;
  width: 100%;
  height: var(--sim-canvas-height, 520px);
  cursor: crosshair;
}

.pf-hud {
  position: absolute;
  top: 10px;
  left: 12px;
  display: flex;
  gap: 14px;
  font-family: var(--pf-mono);
  font-size: 11px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.42);
  pointer-events: none;
  user-select: none;
}

.pf-hud b {
  font-weight: 500;
  color: rgba(255, 255, 255, 0.72);
}

.pf-hint {
  position: absolute;
  right: 12px;
  bottom: 10px;
  font-family: var(--pf-mono);
  font-size: 11px;
  color: rgba(255, 255, 255, 0.3);
  pointer-events: none;
  user-select: none;
}

/* ---------- toolbar ----------------------------------------------------- */

.pf-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 12px 14px;
  border-top: 1px solid var(--pf-border);
  border-bottom: 1px solid var(--pf-border);
  background: var(--pf-field);
}

.pf-bar button {
  padding: 0.42em 0.95em;
  font: inherit;
  color: var(--pf-fg);
  background: var(--entry, #fff);
  border: 1px solid var(--pf-border);
  border-radius: 999px;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.pf-bar button:hover {
  color: var(--pf-accent-strong);
  border-color: var(--pf-accent);
}

.pf-bar button:focus-visible {
  outline: 2px solid var(--pf-accent);
  outline-offset: 2px;
}

.pf-bar .pf-spacer {
  flex: 1 1 auto;
}

.pf-status {
  align-self: center;
  font-family: var(--pf-mono);
  font-size: 11px;
  color: var(--pf-muted);
}

/* ---------- controls ---------------------------------------------------- */

.pf-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 22px;
  padding: 16px 14px 18px;
}

.pf-controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 10px 22px;
  align-content: start;
}

.pf-field label {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 2px;
  color: var(--pf-muted);
}

.pf-field label span:last-child {
  font-family: var(--pf-mono);
  font-size: 11px;
  color: var(--pf-fg);
}

.pf-field input[type="range"] {
  width: 100%;
  margin: 0;
  accent-color: var(--pf-accent);
}

.pf-field input[type="range"]:disabled {
  opacity: 0.35;
}

.pf-field select {
  width: 100%;
  padding: 0.3em 0.5em;
  font: inherit;
  color: var(--pf-fg);
  background: var(--entry, #fff);
  border: 1px solid var(--pf-border);
  border-radius: 6px;
}

/* ---------- legend ------------------------------------------------------ */

.pf-legend {
  display: grid;
  gap: 8px;
  align-content: start;
  min-width: 150px;
}

.pf-legend h4 {
  margin: 0;
  font-size: 0.8125rem;
  font-weight: var(--semibold, 500);
  color: var(--pf-muted);
}

.pf-ramp {
  height: 12px;
  border-radius: 6px;
  background: linear-gradient(90deg,
    #0b0d12 0%, #24305e 25%, #56628e 50%, #bd8d57 75%, #f6e7b2 100%);
}

.pf-ramp-labels {
  display: flex;
  justify-content: space-between;
  font-family: var(--pf-mono);
  font-size: 10.5px;
  color: var(--pf-muted);
}

.pf-keys {
  display: grid;
  gap: 4px;
  font-family: var(--pf-mono);
  font-size: 10.5px;
  color: var(--pf-muted);
}

.pf-keys span {
  display: flex;
  align-items: center;
  gap: 7px;
}

.pf-keys i {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex: none;
}

@media (max-width: 720px) {
  .pf-body {
    grid-template-columns: minmax(0, 1fr);
  }

  .pf-canvas {
    height: min(var(--sim-canvas-height, 520px), 62vh);
  }
}

@media (prefers-reduced-motion: reduce) {
  .pf-bar button {
    transition: none;
  }
}