/* SPECULUM / final presentation pass v5
 *
 * Keeps the observation rail in strict document flow, adds a bounded
 * presentation state, and gives the guided trace one restrained completion
 * gesture. The topology and cadence model remain untouched.
 */

.reduced[hidden] {
  display: none !important;
}

.field-bar-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  flex: 0 0 auto;
  min-width: 250px;
}

.field-action {
  min-height: 34px;
  padding: 7px 10px;
  color: var(--text-dim);
  background: transparent;
  border: 1px solid var(--border-hi);
  font: 400 10.5px/1.2 var(--mono);
  letter-spacing: 0.04em;
  cursor: pointer;
}

.field-action:hover {
  color: var(--text);
  border-color: var(--accent);
}

.field-action[aria-pressed="true"] {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-dim);
  box-shadow: inset 0 -1px 0 var(--accent);
}

.field-action:disabled {
  cursor: wait;
  opacity: 0.55;
}

.field-action-status {
  min-width: 0;
  max-width: 28ch;
  color: var(--text-faint);
  font-size: 9.5px;
  line-height: 1.4;
}

/* Keep each rail region in its own flow box. At constrained heights the
 * controls scroll instead of painting through the dossier beneath them. */
.rail {
  display: flex !important;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
}

.controls {
  flex: 0 1 auto;
  min-height: 0;
  max-height: 39%;
  overflow-x: hidden;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: var(--border-hi) transparent;
}

.detail {
  flex: 1 1 31%;
  min-height: 0 !important;
  max-height: none !important;
  overflow-x: hidden;
  overflow-y: auto;
  position: relative;
  z-index: 0;
}

.ledger-wrap {
  flex: 1.15 1 39%;
  min-height: 0;
  overflow: hidden;
  position: relative;
  z-index: 0;
}

.controls::-webkit-scrollbar,
.detail::-webkit-scrollbar,
.ledger::-webkit-scrollbar {
  width: 8px;
}

.controls::-webkit-scrollbar-thumb,
.detail::-webkit-scrollbar-thumb,
.ledger::-webkit-scrollbar-thumb {
  background: var(--border-hi);
  border: 2px solid var(--bg-1);
}

.spc-trace-completion {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  opacity: 0;
  transition: opacity 180ms ease-out;
}

.spc-trace-completion.is-active { opacity: 1; }
.spc-trace-completion svg { width: 100%; height: 100%; display: block; }

.spc-trace-completion .spc-trace-base {
  fill: none;
  stroke: rgba(245, 166, 35, 0.30);
  stroke-width: 1.4;
}

.spc-trace-completion .spc-trace-pulse {
  fill: none;
  stroke: rgba(245, 166, 35, 0.98);
  stroke-width: 3;
  stroke-linecap: square;
  filter: drop-shadow(0 0 5px rgba(245, 166, 35, 0.55));
  stroke-dasharray: var(--spc-pulse-length, 18) var(--spc-path-length, 500);
  stroke-dashoffset: var(--spc-path-length, 500);
  animation: spc-trace-travel 1.35s cubic-bezier(0.2, 0.75, 0.24, 1) forwards;
}

.spc-trace-completion .spc-trace-arrival {
  fill: none;
  stroke: rgba(74, 222, 128, 0.92);
  stroke-width: 1.5;
  transform-box: fill-box;
  transform-origin: center;
  opacity: 0;
  animation: spc-trace-arrival 920ms ease-out 1.08s forwards;
}

@keyframes spc-trace-travel {
  to { stroke-dashoffset: 0; }
}

@keyframes spc-trace-arrival {
  0% { opacity: 0; transform: scale(0.55); }
  40% { opacity: 1; }
  100% { opacity: 0; transform: scale(1.9); }
}

.field.is-presenting {
  grid-template-columns: minmax(0, 1fr);
  grid-template-areas:
    "bar"
    "canvas";
}

.field.is-presenting .rail,
.field.is-presenting .field-keys {
  display: none !important;
}

.field.is-presenting .field-bar {
  min-height: 56px;
  align-items: center;
}

.field.is-presenting .field-bar-copy p:last-child {
  color: var(--text-faint);
}

.field.is-presenting .field-bar-actions {
  margin-left: auto;
}

body.spc-presentation .field {
  box-shadow: 0 34px 110px rgba(0, 0, 0, 0.38);
}

@media (max-height: 820px) and (min-width: 901px) {
  .controls { max-height: 44%; }
  .detail { flex-basis: 28%; }
  .ledger-wrap { flex-basis: 34%; }
}

@media (max-width: 900px) {
  .field {
    width: 100%;
    min-width: 0;
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto auto auto;
    grid-template-areas:
      "bar"
      "canvas"
      "rail";
  }

  .field-canvas,
  #spc-canvas {
    width: 100%;
    min-width: 0;
  }

  .field-bar-actions {
    width: 100%;
    min-width: 0;
    justify-content: flex-start;
    flex-wrap: wrap;
  }

  .rail {
    width: 100%;
    min-width: 0;
    height: auto;
    overflow: visible;
  }

  .controls,
  .detail,
  .ledger-wrap {
    flex: none;
    max-height: none !important;
    overflow: visible;
  }

  .detail { min-height: 220px !important; }
  .ledger-wrap { min-height: 360px; }
  .ledger { max-height: 420px; overflow-y: auto; }

  .field.is-presenting {
    grid-template-rows: auto auto;
    grid-template-areas:
      "bar"
      "canvas";
  }

  .field.is-presenting .field-bar-copy { display: none; }
  .field.is-presenting .field-bar-actions { margin-left: 0; }
}

@media (max-width: 560px), (pointer: coarse) {
  .field-action,
  .btns button,
  .ledger-pause,
  .relation-button,
  .dossier-actions button,
  .reduced button {
    min-height: 44px;
  }

  .field-action-status {
    flex-basis: 100%;
    max-width: none;
  }
}

/* At very narrow widths the 16px page gutters otherwise leave the canvas
 * below the engine's 320px interaction floor. Make the instrument full-bleed
 * and remove only its side borders so visual and pointer coordinates remain
 * identical without introducing horizontal overflow. */
@media (max-width: 353px) {
  .field {
    width: calc(100% + 32px);
    margin-left: -16px;
    margin-right: -16px;
    border-left: 0;
    border-right: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .spc-trace-completion,
  .spc-trace-completion.is-active { transition: none; }

  .spc-trace-completion .spc-trace-pulse {
    stroke-dasharray: none;
    stroke-dashoffset: 0;
    animation: none;
    opacity: 0.72;
  }

  .spc-trace-completion .spc-trace-arrival {
    animation: none;
    opacity: 0.75;
  }
}