/* ===========================
   A4 Estudio — Archivo de Proyectos
   =========================== */

/* Page header — split row */
.archive-hero {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-md);
  padding: var(--space-3xl) var(--container-padding) var(--space-xl);
}

.archive-hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  margin: 0;
}

.archive-hero p {
  display: none;
}

/* Filters */
.archive-hero .archive-filters {
  display: flex;
  gap: 10px;
  padding: 0;
  flex-wrap: wrap;
}

.filter-btn {
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: var(--weight-medium);
  color: var(--color-gray-500);
  background: transparent;
  border: 1px solid rgba(0, 0, 0, 0.1);
  padding: 12px 24px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all var(--transition);
}

.filter-btn:hover {
  color: var(--color-black);
  border-color: rgba(0, 0, 0, 0.25);
}

.filter-btn.active {
  background: #f0f0f0;
  color: var(--color-black);
  border-color: rgba(0, 0, 0, 0.1);
}

/* Projects grid */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  width: 100%;
  padding: 0 var(--container-padding);
  margin-top: var(--space-lg);
  margin-bottom: 120px;
}

/* Project item */
.project-item {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  cursor: pointer;
  border-radius: 15px;
}

.project-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow), opacity 0.4s ease;
  opacity: 0;
  background: var(--color-gray-100, #f0f0f0);
}

.project-item img.loaded {
  opacity: 1;
}

.project-item:hover img {
  transform: scale(1.05);
}

.project-item:hover {
  opacity: 1;
}



/* Project title tag — glassmorphism pill */
.project-overlay {
  position: absolute;
  bottom: var(--space-sm);
  left: var(--space-sm);
  z-index: 2;
  transform: translateY(60px);
  transition: transform var(--transition);
  will-change: transform;
}

.project-item:hover .project-overlay {
  transform: translateY(0);
}

.project-overlay h3 {
  display: inline-block;
  padding: 6px 20px;
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-regular);
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-pill);
  letter-spacing: -0.2px;
  white-space: nowrap;
}

.project-number {
  opacity: 1;
}

.project-overlay .project-meta {
  display: none;
}

/* Filter animation */
.project-item {
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.project-item.filtered-out {
  display: none;
}

/* Grid fade during filter change */
.projects-grid {
  transition: opacity 0.25s ease;
}

.projects-grid.is-filtering {
  opacity: 0;
}

/* Empty state */
.projects-empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: var(--space-3xl) var(--container-padding);
  color: var(--color-gray-500);
}

/* Responsive */
@media (max-width: 1024px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .archive-hero {
    padding: var(--space-2xl) var(--container-padding) var(--space-lg);
  }

  .archive-filters {
    padding-bottom: var(--space-lg);
  }

  .projects-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .project-overlay {
    bottom: 12px;
    left: 12px;
  }

  .project-overlay {
    transform: translateY(0);
  }

  .project-overlay h3 {
    white-space: normal;
  }

  .projects-grid {
    margin-bottom: 60px;
  }
}

@media (max-width: 480px) {
  .filter-btn {
    font-size: var(--text-sm);
    padding: 10px 18px;
  }
}