/* =========================================================
   FORMAÇÕES — cards que grudam no topo e se empilham
   Cada card tem uma ilustração animada na miniatura.
   JS: js/formacoes.js (empilhamento e escala)
   ========================================================= */

#work { padding: 8rem 4rem; }
.work-header { display: flex; justify-content: space-between; align-items: flex-end; margin-bottom: 4rem; }
.work-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.project-card {
  background: var(--mid); border: 1px solid var(--border);
  border-radius: 1.5rem; overflow: hidden;
  transition: border-color .2s ease, transform .2s var(--ease-out);
}
.project-card:hover { border-color: var(--accent); transform: translateY(-4px); }
.project-card.featured { grid-column: span 2; display: grid; grid-template-columns: 1fr 1fr; }

/* miniatura */
.project-thumb {
  height: 240px; background: #08090b; /* fixo escuro para as miniaturas se destacarem */
  display: flex; align-items: center; justify-content: center;
  font-size: 4rem; position: relative; overflow: hidden;
}
.project-card.featured .project-thumb { height: 100%; min-height: 340px; }
.project-thumb .thumb-bg { position: absolute; inset: 0; opacity: 0.4; }
.project-thumb .thumb-label {
  position: absolute; left: 1.25rem; bottom: .9rem; z-index: 2;
  font-family: var(--serif); font-style: italic;
  font-size: 1.5rem; color: rgba(255,255,255,0.25);
  letter-spacing: -0.05em;
}
.p1 .thumb-bg { background: linear-gradient(135deg, #1b2838, #2a475e); }
.p2 .thumb-bg { background: linear-gradient(135deg, #241838, #44285e); }
.p3 .thumb-bg { background: linear-gradient(135deg, #382418, #5e3a28); }
.p4 .thumb-bg { background: linear-gradient(135deg, #183824, #285e3d); }
/* ilustração animada dentro da miniatura (desenhos em ilustracoes.css) */
.project-thumb .ill-thumb {
  position: absolute; inset: 0; margin: auto; z-index: 1;
  width: 78%; height: 82%; color: #e5a963;
}

/* texto */
.project-info { padding: 1.75rem 2rem; }
.project-number { font-family: var(--mono); font-size: 0.7rem; color: var(--accent); letter-spacing: 0.1em; margin-bottom: 0.75rem; }
.project-info h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 0.5rem; }
.project-info p { font-size: 0.85rem; color: var(--gray); line-height: 1.65; margin-bottom: 1.25rem; }

/* empilhamento (classes colocadas pelo js/formacoes.js) */
.work-grid.is-stack { display: block; }
.stack-slot { height: 70vh; min-height: 420px; }
.stack-slot:last-child { height: auto; min-height: 0; }
.work-grid.is-stack .project-card {
  position: sticky;
  top: calc(110px + var(--stack-i, 0) * 28px);
  display: grid; grid-template-columns: 1fr 1fr;
  min-height: 340px;
  transform-origin: top center;
  will-change: transform;
  box-shadow: 0 -18px 40px rgba(0, 0, 0, .35);
  /* a escala vem do JS; não deixa o fade/hover atrasarem o transform */
  transition: opacity .6s var(--ease-out), border-color .2s ease;
}
.work-grid.is-stack .project-card .project-thumb { height: 100%; min-height: 340px; }
.work-grid.is-stack .project-info { align-self: center; padding: 2.5rem; }
.work-grid.is-stack .project-info h3 { font-size: clamp(1.3rem, 2.4vw, 2rem); }

@media (max-width: 900px) {
  .work-grid { grid-template-columns: 1fr; }
  .project-card.featured { grid-column: span 1; display: block; }
  .project-card.featured .project-thumb { min-height: 220px; }

  .stack-slot { height: 80vh; min-height: 520px; }
  .work-grid.is-stack .project-card { grid-template-columns: 1fr; top: calc(90px + var(--stack-i, 0) * 20px); }
  .work-grid.is-stack .project-card .project-thumb { min-height: 180px; }
  .work-grid.is-stack .project-info { padding: 1.5rem; }
}
@media (prefers-reduced-motion: reduce) {
  .work-grid.is-stack .project-card { transform: none !important; }
}