/* =============================================
   VARIABLES & RESET
   ============================================= */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg:          #121212;
  --surface:     #181818;
  --surface-2:   #242424;
  --border:      #2e2e2e;

  --green:       #1DB954;
  --green-hover: #1ed760;
  --green-dim:   #169c46;

  --text:        #ffffff;
  --text-muted:  #b3b3b3;
  --white:       #ffffff;

  --radius:      8px;
  --gap:         1.5rem;

  --transition:  0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* =============================================
   HEADER
   ============================================= */
.site-header {
  text-align: center;
}

.header-line {
  width: 60px;
  height: 1px;
  background: var(--green);
  margin: 1rem auto;
}

.site-title {
  font-weight: 700;
  font-size: clamp(1.2rem, 5vw, 2rem);
  letter-spacing: 0.35em;
  color: var(--white);
  text-transform: uppercase;
}

.site-subtitle {
  font-size: 0.75rem;
  letter-spacing: 0.3em;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-top: 0.25rem;
}

/* =============================================
   FILTER BAR
   ============================================= */
.filter-bar {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0 1rem 2rem;
}

.filter-btn {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
  padding: 0.5rem 1.2rem;
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  cursor: pointer;
  border-radius: var(--radius);
  transition: var(--transition);
  white-space: nowrap;
}

.filter-btn:hover {
  color: var(--green);
  border-color: var(--green-dim);
}

.filter-btn.active {
  color: var(--bg);
  background: var(--green);
  border-color: var(--green);
}

/* =============================================
   GALLERY GRID
   ============================================= */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--gap);
  padding: 0 var(--gap);
  max-width: 1400px;
  margin: 0 auto;
}

/* =============================================
   GALLERY CARD
   ============================================= */
.gallery-card {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  cursor: pointer;
  aspect-ratio: 4 / 3;

  opacity: 0;
  transform: translateY(28px);
  animation: cardIn 0.6s var(--transition) forwards;
}

.gallery-card.hidden {
  display: none;
}

.gallery-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition:
    transform 0.55s cubic-bezier(0.4, 0, 0.2, 1),
    filter 0.55s ease;
  filter: brightness(0.88) saturate(0.85);
}

.gallery-card:hover img {
  transform: scale(1.07);
  filter: brightness(1) saturate(1.1);
}

.card-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.78) 0%, transparent 60%);
  opacity: 0;
  transition: opacity var(--transition);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 1.2rem 1rem;
}

.gallery-card:hover .card-overlay {
  opacity: 1;
}

.card-title {
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--white);
  letter-spacing: 0.05em;
}

.card-tag {
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--green);
  margin-top: 0.2rem;
}

.card-zoom {
  position: absolute;
  top: 0.9rem;
  right: 0.9rem;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(29,185,84,0.15);
  border: 1px solid var(--green-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: scale(0.8);
  transition: opacity var(--transition), transform var(--transition);
  color: var(--green);
  font-size: 1rem;
}

.gallery-card:hover .card-zoom {
  opacity: 1;
  transform: scale(1);
}

@keyframes cardIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* =============================================
   LIGHTBOX
   ============================================= */
.lightbox-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.92);
  z-index: 900;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.lightbox-overlay.active {
  opacity: 1;
  pointer-events: all;
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 901;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.lightbox.active {
  opacity: 1;
  pointer-events: all;
}

.lb-img-wrap {
  max-width: 88vw;
  max-height: 82vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.lb-img-wrap img {
  max-width: 100%;
  max-height: 75vh;
  object-fit: contain;
  border-radius: var(--radius);
  box-shadow: 0 30px 80px rgba(0,0,0,0.7);
  transition: opacity 0.25s ease;
}

.lb-caption {
  margin-top: 0.9rem;
  font-size: 1rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-align: center;
}

.lb-close {
  position: fixed;
  top: 1.2rem;
  right: 1.5rem;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 1.6rem;
  line-height: 1;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.lb-close:hover {
  color: var(--white);
  border-color: var(--green);
  background: rgba(29,185,84,0.12);
}

.lb-arrow {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 1.4rem;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.lb-prev { left: 1.2rem; }
.lb-next { right: 1.2rem; }

.lb-arrow:hover {
  color: var(--white);
  border-color: var(--green);
  background: rgba(29,185,84,0.12);
}

.lb-counter {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.65rem;
  letter-spacing: 0.25em;
  color: var(--text-muted);
  text-transform: uppercase;
}

/* =============================================
   RESPONSIVE — TABLET (max 900px)
   ============================================= */
@media (max-width: 900px) {
  .gallery-grid {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
    padding: 0 1rem;
  }

  .filter-btn {
    font-size: 0.62rem;
    padding: 0.4rem 0.9rem;
  }

  .lb-img-wrap {
    max-width: 92vw;
  }

  .lb-arrow {
    width: 38px;
    height: 38px;
    font-size: 1.1rem;
  }

  .lb-prev { left: 0.5rem; }
  .lb-next { right: 0.5rem; }
}

/* =============================================
   RESPONSIVE — MÓVIL (max 600px)
   ============================================= */
@media (max-width: 600px) {
  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.6rem;
    padding: 0 0.6rem;
  }

  .filter-bar {
    gap: 0.4rem;
    padding: 0 0.6rem 1.5rem;
  }

  .filter-btn {
    font-size: 0.58rem;
    padding: 0.4rem 0.7rem;
    letter-spacing: 0.1em;
  }

  .card-title {
    font-size: 0.72rem;
  }

  .card-zoom {
    width: 28px;
    height: 28px;
    font-size: 0.8rem;
    top: 0.5rem;
    right: 0.5rem;
    opacity: 1;
    transform: scale(1);
  }

  .card-overlay {
    opacity: 1;
    background: linear-gradient(to top, rgba(0,0,0,0.6) 0%, transparent 50%);
  }

  .lb-arrow {
    display: none;
  }

  .lb-img-wrap {
    max-width: 96vw;
    max-height: 90vh;
  }

  .lb-img-wrap img {
    max-height: 70vh;
  }

  .lb-caption {
    font-size: 0.8rem;
  }

  .lb-close {
    top: 0.7rem;
    right: 0.7rem;
    width: 36px;
    height: 36px;
  }

  .site-title {
    font-size: clamp(1rem, 6vw, 1.5rem);
    letter-spacing: 0.2em;
  }
}

/* =============================================
   RESPONSIVE — MÓVIL PEQUEÑO (max 380px)
   ============================================= */
@media (max-width: 380px) {
  .gallery-grid {
    grid-template-columns: 1fr;
    gap: 0.6rem;
  }

  .filter-btn {
    font-size: 0.55rem;
    padding: 0.35rem 0.6rem;
  }
}

@media (min-width: 1200px) {
  .gallery-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 600px) {
  .gallery-grid {
    grid-template-columns: repeat(5, 1fr);
  }
}