/* ─── PORTAFOLIO ─────────────────────────────────────────────────────────── */

.portfolio {
  padding: var(--sp-2xl) 0;
  background: var(--color-bg);
  overflow: hidden;
}

/* Header */
.portfolio__header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  padding: 0 var(--gutter) var(--sp-lg);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--sp-lg);
}

.portfolio__title {
  font-size: var(--size-display);
  font-weight: var(--w-thin);
  letter-spacing: -0.03em;
}

.portfolio__title strong {
  font-weight: var(--w-bold);
  color: var(--color-dark);
}

/* Filtros */
.portfolio__filter {
  display: flex;
  gap: var(--sp-md);
}

.filter-btn {
  font-size: var(--size-xs);
  font-weight: var(--w-medium);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-mid);
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color var(--dur-fast), border-color var(--dur-fast);
  cursor: none;
  opacity: 0.6;
}

.filter-btn:hover,
.filter-btn--active {
  color: var(--color-dark);
  opacity: 1;
  border-color: var(--color-accent);
}

/* ── Scroll horizontal tipo Floema ───────────────────────────────────────── */

.portfolio__track-wrap {
  position: relative;
  overflow: hidden;
}

/* La pista que se mueve horizontalmente */
.portfolio__track {
  display: flex;
  gap: var(--sp-md);
  padding: 0 var(--gutter) var(--sp-md);
  /* Permite scroll táctil en mobile */
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
  cursor: grab;
}

.portfolio__track::-webkit-scrollbar { display: none; }
.portfolio__track:active { cursor: grabbing; }

/* Cada tarjeta */
.project-card {
  position: relative;
  flex-shrink: 0;
  scroll-snap-align: start;
  overflow: hidden;
  background: var(--color-surface);
  cursor: none;
}

.project-card--large  { width: clamp(400px, 55vw, 780px); aspect-ratio: 4/3; }
.project-card--medium { width: clamp(280px, 36vw, 520px); aspect-ratio: 3/4; }
.project-card--wide   { width: clamp(460px, 65vw, 900px); aspect-ratio: 16/7; }
.project-card--square { width: clamp(300px, 38vw, 560px); aspect-ratio: 1/1; }

/* Imagen */
.project-card__image {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.project-card__img {
  width: 100%; height: 100%;
  object-fit: cover;
  transform: scale(1.06);
  transition: transform 1s var(--ease);
}

.project-card__placeholder {
  width: 100%; height: 100%;
  display: flex;
  align-items: flex-end;
  padding: var(--sp-md);
  transform: scale(1.06);
  transition: transform 1s var(--ease);
}

.project-card:hover .project-card__img,
.project-card:hover .project-card__placeholder {
  transform: scale(1);
}

/* Overlay info */
.project-card__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(26,28,26,0.82) 0%, transparent 55%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--sp-md);
  opacity: 0;
  transition: opacity var(--dur-med) var(--ease);
}

.project-card:hover .project-card__overlay { opacity: 1; }

/* Info siempre visible (parte inferior) */
.project-card__caption {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: var(--sp-md);
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  background: linear-gradient(to top, rgba(26,28,26,0.6) 0%, transparent 100%);
}

.project-card__name {
  font-size: clamp(1rem, 2vw, 1.6rem);
  font-weight: var(--w-thin);
  color: var(--color-white);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.project-card__year {
  font-size: var(--size-xs);
  font-weight: var(--w-light);
  color: rgba(255,255,255,0.5);
  flex-shrink: 0;
}

.project-card__category-tag {
  position: absolute;
  top: var(--sp-md);
  left: var(--sp-md);
}

/* Navegación de la pista */
.portfolio__nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-md) var(--gutter) 0;
}

.portfolio__progress {
  flex: 1;
  height: 1px;
  background: var(--color-border);
  position: relative;
  margin-right: var(--sp-md);
}

.portfolio__progress-bar {
  position: absolute;
  top: 0; left: 0;
  height: 100%;
  background: var(--color-accent);
  width: 0%;
  transition: width 0.3s var(--ease);
}

.portfolio__arrows {
  display: flex;
  gap: var(--sp-sm);
}

.portfolio__arrow {
  width: 40px; height: 40px;
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: var(--color-dark);
  transition: background var(--dur-fast), color var(--dur-fast),
              border-color var(--dur-fast);
  cursor: none;
}

.portfolio__arrow:hover {
  background: var(--color-dark);
  color: var(--color-white);
  border-color: var(--color-dark);
}

/* ── Grid estático (mobile fallback y vista "todos") ─────────────────────── */
.portfolio__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-sm);
  padding: 0 var(--gutter);
}

/* Botón ver más */
.portfolio__more {
  text-align: center;
  margin-top: var(--sp-xl);
  padding: 0 var(--gutter);
}

@media (max-width: 768px) {
  .portfolio__header { flex-direction: column; align-items: flex-start; gap: var(--sp-md); }
  .portfolio__grid { grid-template-columns: 1fr; }
  .project-card--large, .project-card--medium { width: 85vw; }
}