/* ============================================================
   PORTFOLIO GALLERY — In Thành Trung
   Premium design, masonry-like grid, lightbox, smooth filters
   ============================================================ */

/* ---- PAGE HERO ---- */
.portfolio-hero {
  position: relative;
  padding: 140px 0 60px;
  background: linear-gradient(135deg, var(--bg-primary) 0%, #0d1526 100%);
  overflow: hidden;
  text-align: center;
}
.portfolio-hero::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(circle at 30% 40%, rgba(200,150,62,0.08) 0%, transparent 60%),
              radial-gradient(circle at 70% 60%, rgba(59,130,246,0.06) 0%, transparent 50%);
}
.portfolio-hero .container { position: relative; z-index: 1; }
.portfolio-hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 12px;
}
.portfolio-hero h1 .text-gradient {
  background: linear-gradient(135deg, var(--secondary), var(--secondary-light));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.portfolio-hero p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto 32px;
  line-height: 1.6;
}
.portfolio-stats {
  display: flex;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
}
.portfolio-stat {
  text-align: center;
}
.portfolio-stat .num {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--secondary), var(--secondary-light));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.portfolio-stat .label {
  display: block;
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-top: 2px;
}

/* ---- FILTER TABS ---- */
.filter-section {
  padding: 0;
  position: sticky;
  top: 70px;
  z-index: 90;
  background: rgba(10,16,30,0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}
.filter-tabs {
  display: flex;
  gap: 6px;
  padding: 16px 0;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.filter-tabs::-webkit-scrollbar { display: none; }
.filter-tab {
  padding: 10px 20px;
  border: 1px solid var(--border);
  border-radius: 50px;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.88rem;
  font-weight: 500;
  font-family: var(--font-body);
  cursor: pointer;
  transition: all 0.3s ease;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 6px;
}
.filter-tab:hover {
  border-color: var(--secondary);
  color: var(--secondary);
  background: rgba(200,150,62,0.08);
}
.filter-tab.active {
  background: linear-gradient(135deg, var(--secondary), var(--secondary-light));
  color: #0a101e;
  border-color: transparent;
  font-weight: 600;
}
.filter-tab .count {
  background: rgba(255,255,255,0.2);
  padding: 1px 8px;
  border-radius: 20px;
  font-size: 0.75rem;
}
.filter-tab.active .count {
  background: rgba(0,0,0,0.2);
}

/* ---- GRID ---- */
.portfolio-section {
  padding: 48px 0 80px;
}
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
}
.portfolio-grid.filtering .portfolio-item {
  opacity: 0;
  transform: scale(0.9);
}

/* ---- CARD ---- */
.portfolio-item {
  border-radius: 16px;
  overflow: hidden;
  background: var(--card-bg);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  opacity: 1;
  transform: scale(1);
}
.portfolio-item.hidden {
  display: none;
}
.portfolio-item:hover {
  transform: translateY(-6px);
  border-color: var(--secondary);
  box-shadow: 0 20px 60px rgba(200,150,62,0.12);
}
.portfolio-img {
  position: relative;
  aspect-ratio: 4/3;
  overflow: hidden;
}
.portfolio-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}
.portfolio-item:hover .portfolio-img img {
  transform: scale(1.08);
}
.portfolio-img-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(10,16,30,0.8) 0%, transparent 50%);
  display: flex;
  align-items: flex-end;
  padding: 20px;
  opacity: 0;
  transition: opacity 0.4s ease;
}
.portfolio-item:hover .portfolio-img-overlay {
  opacity: 1;
}
.portfolio-img-overlay span {
  color: var(--secondary);
  font-size: 0.9rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
}
.portfolio-category-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  padding: 5px 14px;
  border-radius: 50px;
  background: rgba(10,16,30,0.75);
  backdrop-filter: blur(8px);
  color: var(--secondary);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.5px;
}
.portfolio-body {
  padding: 20px;
}
.portfolio-body h3 {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.3;
}
.portfolio-body p {
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.5;
  margin-bottom: 12px;
}
.portfolio-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.portfolio-tag {
  padding: 3px 10px;
  border-radius: 50px;
  background: rgba(200,150,62,0.1);
  color: var(--secondary);
  font-size: 0.75rem;
  font-weight: 500;
}

/* ---- LIGHTBOX ---- */
.lightbox-overlay {
  position: fixed;
  inset: 0;
  background: rgba(5,8,18,0.92);
  backdrop-filter: blur(20px);
  z-index: 9999;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  opacity: 0;
  transition: opacity 0.3s ease;
}
.lightbox-overlay.active {
  display: flex;
  opacity: 1;
}
.lightbox-content {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 20px;
  max-width: 900px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  animation: lightboxIn 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
@keyframes lightboxIn {
  from { opacity: 0; transform: scale(0.92) translateY(20px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}
.lightbox-header {
  position: relative;
}
.lightbox-header img {
  width: 100%;
  height: 350px;
  object-fit: cover;
  border-radius: 20px 20px 0 0;
}
.lightbox-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(10,16,30,0.7);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.15);
  color: white;
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: 0.3s;
}
.lightbox-close:hover {
  background: var(--secondary);
  color: #0a101e;
}
.lightbox-body {
  padding: 32px;
}
.lightbox-body h2 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.lightbox-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 20px;
}
.lightbox-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
  font-size: 0.85rem;
}
.lightbox-meta-item span:first-child {
  font-size: 1.1rem;
}
.lightbox-desc {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 24px;
}
.lightbox-specs {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
  margin-bottom: 24px;
}
.spec-item {
  background: rgba(200,150,62,0.06);
  border: 1px solid rgba(200,150,62,0.15);
  border-radius: 12px;
  padding: 14px;
}
.spec-item .spec-label {
  color: var(--text-muted);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}
.spec-item .spec-value {
  color: var(--secondary);
  font-weight: 600;
  font-size: 0.95rem;
}
.lightbox-cta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.lightbox-cta .btn {
  padding: 12px 28px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: 0.3s;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-gold {
  background: linear-gradient(135deg, var(--secondary), var(--secondary-light));
  color: #0a101e;
  border: none;
}
.btn-gold:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(200,150,62,0.3);
}
.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
}
.btn-ghost:hover {
  border-color: var(--secondary);
  color: var(--secondary);
}

/* ---- CTA SECTION ---- */
.portfolio-cta {
  text-align: center;
  padding: 60px 0 80px;
  background: linear-gradient(to bottom, var(--bg-primary), #0d1526);
}
.portfolio-cta h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: var(--text-primary);
  margin-bottom: 12px;
}
.portfolio-cta p {
  color: var(--text-secondary);
  margin-bottom: 28px;
  font-size: 1.05rem;
}

/* ---- RESPONSIVE ---- */
@media (max-width: 768px) {
  .portfolio-hero { padding: 110px 0 40px; }
  .portfolio-stats { gap: 24px; }
  .portfolio-grid { grid-template-columns: 1fr; gap: 16px; }
  .filter-tabs { gap: 4px; }
  .filter-tab { padding: 8px 14px; font-size: 0.82rem; }
  .lightbox-content { margin: 10px; }
  .lightbox-header img { height: 220px; }
  .lightbox-body { padding: 20px; }
  .lightbox-specs { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .portfolio-grid { grid-template-columns: 1fr; }
  .lightbox-specs { grid-template-columns: 1fr; }
}