:root {
  --bg: #0f1419;
  --surface: #1a2332;
  --border: #2d3a4f;
  --text: #e7ecf3;
  --muted: #8b9cb3;
  --accent: #3d8bfd;
  --accent2: #5eead4;
  --risk: #f87171;
  --ok: #4ade80;
  --card: #15202b;
  font-family: "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}

a { color: var(--accent2); }

header.site-header {
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.5rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  background: var(--surface);
}

.logo {
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.logo span { color: var(--accent); }

.tag-mit {
  border-color: var(--accent2);
  color: var(--accent2);
}

.chain-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  margin: 1rem 0;
  font-size: 0.95rem;
}

.chain-box ul {
  margin: 0.5rem 0 0;
  padding-left: 1.2rem;
  color: var(--muted);
}

.chain-box li { margin-bottom: 0.35rem; }

.filters-secondary {
  opacity: 0.92;
  margin-top: 0.5rem;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  margin-right: 1.25rem;
  font-size: 0.95rem;
}

nav a:hover, nav a.active { color: var(--text); }

nav a.nav-lab { color: #ff8800; font-weight: 600; margin-right: 1.5rem; }
nav a.nav-lab:hover { color: #ffaa44; }

main { max-width: 1100px; margin: 0 auto; padding: 2rem 1.5rem 4rem; }

.hero {
  text-align: center;
  padding: 3rem 1rem 2rem;
}

.hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  margin: 0 0 0.75rem;
  line-height: 1.2;
}

.hero .lead {
  color: var(--muted);
  max-width: 42rem;
  margin: 0 auto 2rem;
  font-size: 1.1rem;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin-top: 2.5rem;
}

.card-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
}

.card-box h3 { margin-top: 0; font-size: 1.05rem; }

.compare {
  margin-top: 3rem;
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

th, td {
  border: 1px solid var(--border);
  padding: 0.6rem 0.75rem;
  text-align: left;
}

th { background: var(--surface); }

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.chip {
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.85rem;
}

.chip.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.library-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.lib-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem 1.1rem;
  cursor: pointer;
  transition: border-color 0.15s;
}

.lib-card:hover { border-color: var(--accent); }

.lib-card .q {
  font-style: italic;
  color: var(--accent2);
  font-size: 0.95rem;
  margin: 0.5rem 0;
}

.lib-card .meta {
  font-size: 0.75rem;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.tag {
  background: var(--surface);
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
}

.detail-panel {
  margin-top: 2rem;
  padding: 1.25rem;
  background: var(--surface);
  border-radius: 12px;
  border: 1px solid var(--border);
  display: none;
}

.detail-panel.visible { display: block; }

.assessment-progress {
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  margin-bottom: 1.5rem;
  overflow: hidden;
}

.assessment-progress div {
  height: 100%;
  background: var(--accent2);
  width: 0%;
  transition: width 0.2s;
}

.q-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1rem;
}

.q-card h2 { margin-top: 0; font-size: 1.15rem; }

.answers { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1rem; }

.answers button {
  padding: 0.6rem 1.2rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  font-size: 0.95rem;
}

.answers button:hover { border-color: var(--accent); }

.answers button.selected-yes { background: var(--risk); border-color: var(--risk); }
.answers button.selected-no { background: #166534; border-color: var(--ok); }

footer.site-footer {
  text-align: center;
  padding: 2rem;
  color: var(--muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
}

/* —— Página didáctica (cómo funciona) —— */

.page-hero {
  text-align: center;
  padding: 2rem 1rem 1.5rem;
  max-width: 40rem;
  margin: 0 auto;
}

.page-hero h1 {
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  margin: 0 0 0.75rem;
}

.section-block {
  margin-top: 3rem;
}

.section-block h2 {
  font-size: 1.35rem;
  margin-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.5rem;
}

.section-block .intro {
  color: var(--muted);
  max-width: 52rem;
}

.stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.stat-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
  text-align: center;
}

.stat-box strong {
  display: block;
  font-size: 1.75rem;
  color: var(--accent2);
}

.audience-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.audience-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.15rem;
}

.audience-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
  color: var(--accent2);
}

.rail-flow {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  align-items: center;
  margin: 1.25rem 0;
  font-size: 0.85rem;
  font-family: ui-monospace, monospace;
}

.rail-node {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 0.4rem 0.65rem;
  border-radius: 6px;
}

.rail-node.highlight {
  border-color: var(--accent);
  background: rgba(61, 139, 253, 0.15);
}

.rail-arrow { color: var(--muted); }

.card-anatomy {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.75rem;
  margin-top: 1rem;
}

.anatomy-item {
  background: var(--card);
  border-left: 3px solid var(--accent);
  padding: 0.85rem 1rem;
  border-radius: 0 8px 8px 0;
}

.steps {
  counter-reset: step;
  list-style: none;
  padding: 0;
  margin: 1.25rem 0 0;
}

.steps li {
  counter-increment: step;
  position: relative;
  padding: 1rem 1rem 1rem 3.5rem;
  margin-bottom: 0.75rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.steps li::before {
  content: counter(step);
  position: absolute;
  left: 1rem;
  top: 1rem;
  width: 1.75rem;
  height: 1.75rem;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
}

.steps li h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
}

.steps li p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.mock-card {
  background: linear-gradient(135deg, #1a2838 0%, #15202b 100%);
  border: 1px solid var(--accent);
  border-radius: 14px;
  padding: 1.25rem;
  margin-top: 1rem;
  max-width: 28rem;
}

.mock-card .label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent2);
}

.mock-card .question {
  font-size: 1.05rem;
  font-style: italic;
  margin: 0.5rem 0 1rem;
}

.mock-card .back {
  border-top: 1px dashed var(--border);
  padding-top: 0.75rem;
  font-size: 0.88rem;
  color: var(--muted);
}

.cta-banner {
  text-align: center;
  margin-top: 3rem;
  padding: 2rem;
  background: var(--surface);
  border-radius: 14px;
  border: 1px solid var(--border);
}

.notice-banner {
  background: rgba(61, 139, 253, 0.12);
  border: 1px solid var(--accent);
  border-radius: 12px;
  padding: 1rem 1.15rem;
  margin: 1rem 0 1.5rem;
  font-size: 0.92rem;
  line-height: 1.5;
}

.notice-banner strong { color: var(--accent2); }

.notice-banner.warn {
  background: rgba(255, 193, 7, 0.08);
  border-color: #b8860b;
}

.notice-banner ul {
  margin: 0.5rem 0 0;
  padding-left: 1.2rem;
  color: var(--muted);
}

.lab-badge {
  display: inline-block;
  font-size: 0.8rem;
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--accent2);
  margin-bottom: 0.5rem;
}

/* —— Tarjetas volteables (por técnica) —— */

.flip-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.flip-card {
  perspective: 1000px;
  min-height: 220px;
  cursor: pointer;
  outline: none;
}

.flip-inner {
  position: relative;
  width: 100%;
  min-height: 220px;
  transition: transform 0.55s;
  transform-style: preserve-3d;
}

.flip-card.flipped .flip-inner {
  transform: rotateY(180deg);
}

.flip-front,
.flip-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 1.1rem 1.2rem;
  background: var(--card);
}

.flip-back {
  transform: rotateY(180deg);
  border-color: var(--accent2);
  background: linear-gradient(160deg, #15202b 0%, #1a2d3d 100%);
}

.flip-front .question {
  font-size: 1.05rem;
  font-style: italic;
  color: var(--accent2);
  margin: 0.75rem 0;
  line-height: 1.45;
}

.flip-back .answer-coloquial {
  font-size: 0.98rem;
  margin: 0.5rem 0 0.75rem;
  color: var(--text);
}

.flip-back .mits {
  font-size: 0.88rem;
  margin: 0.75rem 0;
  line-height: 1.5;
}

.flip-front .label,
.flip-back .label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* —— Biblioteca de tarjetas (volteo 3D) —— */

.plot4-library h1 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  margin-bottom: 0.5rem;
}

.plot4-library .intro {
  color: var(--muted);
  max-width: 52rem;
  line-height: 1.6;
}

.plot4-section-title {
  font-size: 1.15rem;
  margin: 2rem 0 0.35rem;
  color: var(--accent2);
}

.plot4-hint,
.plot4-instructions {
  font-size: 0.9rem;
  color: var(--muted);
  margin: 0 0 1rem;
}

.plot4-categories {
  margin-bottom: 1.5rem;
}

.plot4-card-count {
  font-size: 0.95rem;
  color: var(--accent2);
  margin: 0.75rem 0 1rem;
  min-height: 1.25rem;
}

.plot4-loading {
  grid-column: 1 / -1;
  padding: 2rem 0;
  text-align: center;
}

.plot4-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
  align-items: start;
}

/* Contenedor de cada tarjeta (celda del grid) */
.plot4-card {
  height: 280px;
  min-height: 280px;
  outline: none;
  perspective: 1200px;
  -webkit-perspective: 1200px;
}

.plot4-card.is-selected .plot4-face {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(61, 139, 253, 0.4),
    0 8px 24px rgba(0, 0, 0, 0.35);
}

/* Caja que rota (frente + reverso apilados en 3D) */
.plot4-inner {
  position: relative;
  width: 100%;
  height: 280px;
  min-height: 280px;
  transform-style: preserve-3d;
  -webkit-transform-style: preserve-3d;
  transition: transform 0.55s ease;
  -webkit-transition: -webkit-transform 0.55s ease;
}

.plot4-inner.flipped {
  transform: rotateY(180deg);
  -webkit-transform: rotateY(180deg);
}

/* Cara: ocupa toda la caja; solo una visible a la vez */
.plot4-face {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 1.15rem 1.2rem 1.2rem;
  background: var(--card);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  overflow-y: auto;
  box-sizing: border-box;
  transition: visibility 0s linear 0.28s;
}

.plot4-front {
  transform: rotateY(0deg) translateZ(1px);
  -webkit-transform: rotateY(0deg) translateZ(1px);
}

.plot4-back {
  transform: rotateY(180deg) translateZ(1px);
  -webkit-transform: rotateY(180deg) translateZ(1px);
  border-color: rgba(94, 234, 212, 0.45);
  background: linear-gradient(165deg, #1e3248 0%, #15202b 100%);
}

/* Respaldo si el motor 3D no oculta la cara trasera */
.plot4-inner:not(.flipped) .plot4-back {
  visibility: hidden;
  pointer-events: none;
}

.plot4-inner.flipped .plot4-front {
  visibility: hidden;
  pointer-events: none;
}

.plot4-inner.flipped .plot4-back {
  visibility: visible;
  pointer-events: auto;
}

.plot4-flip-btn {
  position: absolute;
  top: 0.65rem;
  right: 0.65rem;
  width: 2rem;
  height: 2rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--accent2);
  cursor: pointer;
  font-size: 1.1rem;
  line-height: 1;
  z-index: 2;
}

.plot4-flip-btn:hover {
  border-color: var(--accent2);
  background: rgba(94, 234, 212, 0.12);
}

.plot4-question {
  margin: 0 2rem 0.5rem 0;
  font-size: 1.02rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text);
  font-style: normal;
}

.plot4-refs {
  font-size: 0.8rem;
  margin: 0 0 0.5rem;
}

.plot4-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.plot4-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent2);
  margin: 0 0 0.35rem;
}

.plot4-answer {
  margin: 0 0 0.65rem;
  font-size: 0.95rem;
  line-height: 1.5;
  padding-right: 0.5rem;
}

.plot4-formal {
  font-size: 0.85rem;
  margin-bottom: 0.65rem;
}

.plot4-mits {
  margin: 0 0 0.75rem;
  padding-left: 1.1rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.plot4-mits li {
  margin-bottom: 0.35rem;
}

.plot4-case-link {
  font-size: 0.88rem;
  font-weight: 600;
}

.video-embed {
  position: relative;
  width: 100%;
  max-width: 720px;
  margin: 1rem 0;
  aspect-ratio: 16 / 9;
  background: #000;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.video-embed iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.video-missing {
  padding: 0.75rem 1rem;
  border-left: 3px solid var(--border);
  background: var(--surface);
  border-radius: 4px;
}

.video-note {
  margin-top: 0.35rem;
}