/* ROBOT-01 teardown — seccion integrada a la landing */

#robot-teardown {
  position: relative;
  height: 780vh;
  background: #020202;
}

.rt-semantic-title {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.rt-controls {
  max-width: 64rem;
  margin: 0 auto;
  padding: 1rem 1.5rem 2rem;
  color: #d8dfe3;
}

.rt-controls summary {
  display: list-item;
  min-height: 44px;
  padding: 0.75rem 0;
  cursor: pointer;
}

.rt-controls summary:focus-visible {
  outline: 2px solid #b7d8e5;
  outline-offset: 4px;
}

.rt-controls dl {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 16rem), 1fr));
  gap: 1.25rem 2rem;
  margin: 1rem 0 0;
}

.rt-controls dt {
  font-weight: 600;
}

.rt-controls dd {
  margin: 0.4rem 0 0;
  color: #a4adb3;
  line-height: 1.6;
}

#robot-teardown.is-static {
  height: 100svh;
  min-height: 36rem;
}

#robot-teardown.is-static .rt-sticky {
  position: absolute;
  visibility: visible;
}

#robot-teardown.is-static .rt-still {
  opacity: 1;
}

#robot-teardown.is-static #rt-stage,
#robot-teardown.is-static .rt-scanline {
  display: none;
}

#robot-teardown.is-static .rt-ch-0 {
  opacity: 1;
}

#robot-teardown .rt-sticky {
  position: fixed;
  inset: 0;
  overflow: hidden;
  visibility: hidden;
  pointer-events: none;
  z-index: 30;
}

/* al terminar el scrub, el frame final queda anclado al fondo de la seccion
   y sale scrolleando con la pagina (nada de fundido a negro) */
#robot-teardown .rt-sticky.rt-done {
  position: absolute;
  inset: auto 0 0 0;
  height: 100lvh;
}

/* capa 1: el hangar de la secuencia SIN el robot (placa limpia).
   Aparece cuando el 3D toma el relevo y queda de fondo todo el teardown. */
.rt-still {
  position: absolute;
  inset: 0;
  background: url('/robot/hangar-plate.jpg') center / cover no-repeat;
  opacity: 0;
  z-index: 2;
}

/* barrido de escaneo */
.rt-scanline {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 18vh;
  background: linear-gradient(
    to bottom,
    transparent,
    rgba(255, 255, 255, 0.05) 35%,
    rgba(255, 255, 255, 0.58) 50%,
    rgba(255, 255, 255, 0.05) 65%,
    transparent
  );
  mix-blend-mode: screen;
  opacity: 0;
  transform: translateY(-20vh);
  z-index: 4;
  pointer-events: none;
}

#rt-stage {
  position: absolute;
  inset: 0;
  z-index: 3;
}

#rt-stage canvas { display: block; }

#rt-labels {
  position: absolute !important;
  inset: 0;
  z-index: 5;
  pointer-events: none;
}

.rt-chapter {
  position: absolute;
  top: 6vh;
  left: 0;
  right: 0;
  text-align: center;
  z-index: 6;
  pointer-events: none;
  opacity: 0;
  color: #f5f5f5;
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.6);
}

/* scrim: legibilidad del titular sobre los rayos de luz del hangar
   (el gradiente muere al 68% del radio para no dejar bordes de caja) */
.rt-chapter::before {
  content: '';
  position: absolute;
  inset: -18vh -18vw -14vh;
  background: radial-gradient(ellipse 52% 52% at 50% 44%, rgba(4, 4, 4, 0.6), transparent 68%);
  z-index: -1;
}

.rt-chapter h3 {
  max-width: 19ch;
  margin: 0 auto;
  padding-inline: 1rem;
  font-family: var(--font-display, 'Newsreader Variable', Georgia, serif);
  font-size: clamp(2rem, 4.8vw, 4rem);
  font-weight: 400;
  letter-spacing: -0.035em;
  line-height: 1.06;
  text-wrap: balance;
}

.rt-chapter p {
  max-width: 42ch;
  margin: 0.8rem auto 0;
  padding-inline: 1rem;
  font-family: var(--font-body, 'IBM Plex Sans Variable', sans-serif);
  font-size: clamp(0.875rem, 1.4vw, 1.1rem);
  line-height: 1.5;
  opacity: 0.85;
}

.rt-ch-0 { color: #f5f5f5; }           /* sobre el fotograma oscuro */
.rt-ch-0 p { opacity: 0.8; }

/* ---------- etiquetas de piezas ---------- */

.part-label {
  display: flex;
  align-items: center;
  width: 190px;
  --ink: #e8e8e8;
  --label-surface: rgba(8, 8, 8, 0.92);
}

.part-label.right { margin-left: 95px; }

.part-label.left {
  margin-left: -95px;
  flex-direction: row-reverse;
}

.part-label .dot {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ink);
}

.part-label .line {
  flex: 1;
  height: 1.5px;
  background: var(--ink);
}

.part-label.right .line { transform-origin: left center; }
.part-label.left  .line { transform-origin: right center; }

.part-label .txt {
  flex: none;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 3px 7px;
  border: 1px solid rgba(232, 232, 232, 0.4);
  background: var(--label-surface);
  color: #f5f5f5;
  white-space: nowrap;
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
}

.part-label .txt em {
  display: block;
  font-style: normal;
  font-weight: 400;
  font-size: 10px;
  opacity: 0.85;
  letter-spacing: 0;
}

.rt-evidence {
  position: absolute;
  z-index: 40;
  bottom: max(2rem, env(safe-area-inset-bottom));
  left: var(--safe-left, 1.5rem);
  right: var(--safe-right, 1.5rem);
  max-width: 42rem;
  padding: 1.5rem;
  background: rgba(2, 2, 2, 0.9);
  border-top: 1px solid rgba(245, 245, 245, 0.3);
  color: #f5f5f5;
}

.rt-evidence-label {
  margin: 0 0 1rem;
  font: 0.75rem/1.5 var(--font-mono, monospace);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #d5e7a6;
}

.rt-evidence-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.rt-evidence-links a {
  display: grid;
  gap: 0.35rem;
  min-height: 44px;
  padding-block: 0.25rem;
  color: inherit;
  text-decoration: none;
}

.rt-evidence-links a > span {
  font-size: 0.875rem;
  color: #c5c5c5;
}

.rt-evidence-links strong {
  font-weight: 500;
  font-size: 1.15rem;
}

.rt-all-proof {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 44px;
  margin-top: 0.75rem;
  color: #f5f5f5;
  font-size: 0.875rem;
  text-underline-offset: 0.3em;
}

.rt-evidence a:hover,
.rt-evidence a:focus-visible {
  color: var(--color-interactive, #d5e7a6);
}

.rt-evidence a:focus-visible {
  outline: 2px solid var(--color-interactive, #d5e7a6);
  outline-offset: 5px;
}

@media (max-width: 600px) {
  .rt-evidence { padding: 1rem; }
  .rt-evidence-links { grid-template-columns: 1fr; gap: 0.75rem; }
  .part-label { width: 110px; }
  .part-label.right { margin-left: 48px; }
  .part-label.left { margin-left: -48px; }
  .part-label .txt { font-size: 10px; padding: 4px; }
  .part-label .txt em { max-width: 14ch; white-space: normal; }
  .rt-ch-2 p { display: none; }
}