/* ==========================================================================
   Double-Pendulum Lattice — presentation layer.
   Same design language as the other sims: themed chrome, dark instrument
   viewport. Two synchronized panels: the pendulums and the field heatmap.
   ========================================================================== */

.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);
}

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

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

/* ---------- viewport: two square panels -------------------------------- */

.dp-stage {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--dp-ink);
}

.dp-panel {
  position: relative;
  line-height: 0;
}

.dp-canvas {
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1;
  background: var(--dp-ink);
}

.dp-canvas--lattice {
  cursor: crosshair;
}

.dp-caption {
  position: absolute;
  left: 10px;
  bottom: 8px;
  font-family: var(--dp-mono);
  font-size: 11px;
  color: rgba(255, 255, 255, 0.35);
  pointer-events: none;
  user-select: none;
}

.dp-hud {
  position: absolute;
  top: 10px;
  left: 12px;
  display: flex;
  gap: 14px;
  font-family: var(--dp-mono);
  font-size: 11px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.42);
  pointer-events: none;
  user-select: none;
  z-index: 1;
}

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

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

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

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

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

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

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

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

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

.dp-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px 22px;
  padding: 16px 14px 18px;
}

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

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

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

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

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

@media (max-width: 720px) {
  .dp-stage {
    grid-template-columns: 1fr;
  }
}

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