#portfolio {
  padding: 120px 60px;
  background: var(--graphite);
}

.portfolio-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 60px;
}

.portfolio-title {
  font-family: var(--font-display);
  font-size: clamp(36px, 4vw, 58px);
  font-weight: 300;
  letter-spacing: -0.01em;
}

.portfolio-filter {
  display: flex;
  gap: 6px;
}

.filter-btn {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: rgba(255, 255, 255, 0.45);
  padding: 8px 20px;
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-family: var(--font-main);
  font-weight: 500;
  cursor: none;
  transition: all 0.3s;
}

.filter-btn.active,
.filter-btn:hover {
  border-color: var(--blue);
  color: var(--white);
  background: var(--blue-glow);
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-template-rows: 320px 320px;
  gap: 8px;
}

.project-card {
  position: relative;
  overflow: hidden;
  cursor: none;
}

.project-card:nth-child(1) { grid-column: 1 / 7;  grid-row: 1; }
.project-card:nth-child(2) { grid-column: 7 / 10; grid-row: 1; }
.project-card:nth-child(3) { grid-column: 10 / 13; grid-row: 1; }
.project-card:nth-child(4) { grid-column: 1 / 4;  grid-row: 2; }
.project-card:nth-child(5) { grid-column: 4 / 8;  grid-row: 2; }
.project-card:nth-child(6) { grid-column: 8 / 13; grid-row: 2; }

.project-card:nth-child(1) .project-bg { background: linear-gradient(135deg, #0f1a2a 0%, #1a2d42 40%, #0d2035 100%); }
.project-card:nth-child(2) .project-bg { background: linear-gradient(145deg, #1c1c1c 0%, #2a2a2a 100%); }
.project-card:nth-child(3) .project-bg { background: linear-gradient(135deg, #0a1520 0%, #15253a 100%); }
.project-card:nth-child(4) .project-bg { background: linear-gradient(135deg, #1a1a1a 0%, #252525 100%); }
.project-card:nth-child(5) .project-bg { background: linear-gradient(145deg, #0c1825 0%, #172335 100%); }
.project-card:nth-child(6) .project-bg { background: linear-gradient(135deg, #141414 0%, #1f1f1f 100%); }

.project-bg {
  position: absolute;
  inset: 0;
  transition: transform 0.7s ease;
}

.project-card:hover .project-bg {
  transform: scale(1.05);
}

.project-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(59, 138, 255, 0.06) 0%, transparent 50%);
}

.project-reflection {
  position: absolute;
  width: 60%;
  height: 300%;
  background: linear-gradient(to right, transparent, rgba(255, 255, 255, 0.03), transparent);
  transform: rotate(20deg);
  top: -100%;
  left: 10%;
  transition: left 0.8s ease, opacity 0.5s ease;
  opacity: 0;
  pointer-events: none;
}

.project-card:hover .project-reflection {
  opacity: 1;
  left: 80%;
}

.project-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.85) 0%, transparent 50%);
}

.project-info {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 28px 28px 24px;
  transform: translateY(8px);
  transition: transform 0.4s ease;
}

.project-card:hover .project-info {
  transform: translateY(0);
}

.project-cat {
  font-size: 9px;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--blue);
  font-weight: 600;
  margin-bottom: 6px;
}

.project-name {
  font-size: 15px;
  font-weight: 500;
  color: var(--white);
  letter-spacing: 0.02em;
}

.project-location {
  font-size: 11px;
  color: rgba(255, 255, 255, 0.4);
  margin-top: 4px;
  letter-spacing: 0.08em;
}