.projects {
  background: var(--color-bg);
}

.projects__filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: var(--space-lg);
}

/* ── Lista de proyectos ──────────────────────────── */
.projects__list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--color-border);
}

/* ── Item ────────────────────────────────────────── */
.project-item {
  border-bottom: 1px solid var(--color-border);
  position: relative;
  transition: background var(--duration-fast) ease;
}

.project-item.is-hidden {
  display: none;
}

.project-item.is-open {
  background: var(--color-surface);
}

/* Línea dorada que se extiende al abrir */
.project-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  height: 2px;
  width: 0;
  background: var(--color-gold);
  transition: width var(--duration-slow) var(--ease-out);
}

.project-item.is-open::before,
.project-item:hover::before {
  width: 100%;
}

/* ── Cabecera (siempre visible) ──────────────────── */
.project-item__head {
  display: grid;
  grid-template-columns: 120px 1fr auto;
  gap: var(--space-md);
  align-items: center;
  padding-block: 2rem;
  cursor: pointer;
  user-select: none;
}

.project-item__meta {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.project-item__num {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  color: var(--color-text-muted);
  line-height: 1;
  transition: color var(--duration-base) ease;
}

.project-item.is-open .project-item__num,
.project-item:hover .project-item__num {
  color: var(--color-gold);
}

.project-item__cat {
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-gold-dim);
}

/* Título y tagline */
.project-item__main {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.project-item__title {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 400;
  color: var(--color-text);
  line-height: 1.2;
  transition: color var(--duration-fast) ease;
}

.project-item:hover .project-item__title,
.project-item.is-open .project-item__title {
  color: var(--color-gold-light);
}

.project-item__tagline {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
}

.project-item__tagline em {
  color: var(--color-text-dim);
  font-style: italic;
}

/* Año + botón */
.project-item__aside {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-shrink: 0;
}

.project-item__year {
  font-family: var(--font-display);
  font-size: var(--text-base);
  color: var(--color-text-muted);
  white-space: nowrap;
}

/* Botón +/– */
.project-item__toggle {
  width: 36px;
  height: 36px;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: border-color var(--duration-fast) ease,
              background var(--duration-fast) ease;
}

.project-item__toggle:hover,
.project-item.is-open .project-item__toggle {
  border-color: var(--color-gold);
  background: rgba(201, 168, 76, 0.08);
}

/* Cruz → raya al abrir (con rotación via JS) */
.project-item__toggle-icon {
  position: relative;
  width: 12px;
  height: 12px;
}

.project-item__toggle-icon::before,
.project-item__toggle-icon::after {
  content: '';
  position: absolute;
  background: var(--color-gold);
  border-radius: 1px;
  transition: transform var(--duration-base) var(--ease-out),
              opacity var(--duration-fast) ease;
}

.project-item__toggle-icon::before {
  width: 12px; height: 1px;
  top: 50%; left: 0;
  transform: translateY(-50%);
}

.project-item__toggle-icon::after {
  width: 1px; height: 12px;
  left: 50%; top: 0;
  transform: translateX(-50%);
}

.project-item.is-open .project-item__toggle-icon::after {
  transform: translateX(-50%) rotate(90deg);
  opacity: 0;
}

/* ── Cuerpo desplegable ──────────────────────────── */
.project-item__body {
  overflow: hidden;
}

/* 'hidden' lo gestiona JS; cuando está visible: */
.project-item__body:not([hidden]) {
  display: block;
}

.project-item__body-inner {
  padding: 0 0 2.5rem 120px;
  padding-right: calc(36px + 1.5rem + var(--space-md));
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.project-item__body-inner > p {
  font-size: var(--text-base);
  color: var(--color-text-dim);
  line-height: 1.85;
  max-width: 680px;
}

/* Detalles en grid */
.project-item__details {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.project-item__detail {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 1rem;
  font-size: var(--text-sm);
}

.project-item__detail-label {
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-gold);
  padding-top: 0.1rem;
}

.project-item__detail span:last-child {
  color: var(--color-text-dim);
  line-height: 1.6;
}

/* ── Responsive ──────────────────────────────────── */
@media (max-width: 768px) {
  .project-item__head {
    grid-template-columns: 60px 1fr auto;
    gap: 1rem;
    padding-block: 1.5rem;
  }

  .project-item__num {
    font-size: var(--text-lg);
  }

  .project-item__title {
    font-size: var(--text-lg);
  }

  .project-item__year { display: none; }

  .project-item__body-inner {
    padding-left: calc(60px + 1rem);
    padding-right: 1rem;
  }

  .project-item__detail {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }
}