.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.4rem;
}

.portfolio-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.8rem;
  position: relative;
  overflow: hidden;
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
}
.portfolio-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--card-accent);
  opacity: 0.8;
  transition: opacity 0.3s;
}
.portfolio-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(
    450px circle at var(--mx, 50%) var(--my, 50%),
    rgba(16,185,129,0.06),
    transparent 60%
  );
  opacity: 0;
  transition: opacity 0.4s;
  pointer-events: none;
}
.portfolio-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-5px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.35), 0 0 0 1px rgba(16,185,129,0.1);
}
.portfolio-card:hover::before { opacity: 1; }
.portfolio-card:hover::after { opacity: 1; }

.card-icon {
  width: 46px; height: 46px;
  border-radius: 11px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.3rem;
  background: color-mix(in srgb, var(--card-accent) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--card-accent) 20%, transparent);
  transition: all 0.3s;
}
.card-icon svg {
  width: 22px; height: 22px;
  stroke: var(--card-accent);
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.portfolio-card:hover .card-icon {
  background: color-mix(in srgb, var(--card-accent) 20%, transparent);
  box-shadow: 0 0 24px color-mix(in srgb, var(--card-accent) 25%, transparent);
}

.card-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.7rem;
  color: var(--text);
}
.card-desc {
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--muted);
}
.card-website {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--card-accent, var(--accent2));
  margin-top: 0.6rem;
  text-decoration: none;
  transition: opacity 0.2s;
}
.card-website:hover {
  opacity: 0.75;
}
.card-website svg {
  width: 12px; height: 12px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
}

.card-learn-more {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent2);
  margin-top: 1rem;
  transition: color 0.2s;
  cursor: pointer;
  user-select: none;
}
.card-learn-more svg {
  width: 14px; height: 14px;
  stroke: var(--accent2);
  fill: none;
  stroke-width: 2;
  transition: transform 0.3s;
}
.portfolio-card.expanded .card-learn-more svg {
  transform: rotate(180deg);
}

.card-detail {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.45s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.35s;
  opacity: 0;
}
.portfolio-card.expanded .card-detail {
  max-height: 800px;
  opacity: 1;
}
.card-detail-inner {
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  margin-top: 1rem;
  font-size: 0.85rem;
  line-height: 1.75;
  color: var(--muted);
}

@keyframes card-pop {
  0% { box-shadow: 0 0 0 0 var(--card-accent); }
  40% { box-shadow: 0 0 20px 4px var(--card-accent); }
  100% { box-shadow: none; }
}
.portfolio-card.card-highlight {
  animation: card-pop 1.5s ease-out;
  border-color: var(--card-accent);
}