/* === Portfolio Section === */
.portfolio {
  padding: 6rem 2rem 5rem;
  position: relative;
}

.portfolio::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: min(700px, 80%);
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 247, 255, 0.22), transparent);
}

/* ── Header ──────────────────────────────────────── */
.portfolio-header {
  text-align: center;
  max-width: 1200px;
  margin: 0 auto 2.5rem;
}

.portfolio-header h2 {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: 0.6rem;
}

.portfolio-subtitle {
  font-size: 1rem;
  color: var(--color-light);
  opacity: 0.5;
  margin: 0;
}

/* ── Filters ─────────────────────────────────────── */
.portfolio-filters {
  display: flex;
  justify-content: center;
  gap: 0.55rem;
  margin: 0 auto 3rem;
  max-width: 1200px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 0.42rem 1.15rem;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: transparent;
  color: var(--color-light);
  border-radius: 100px;
  font-family: var(--font-main);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.22s, border-color 0.22s, color 0.22s;
  letter-spacing: 0.2px;
}

.filter-btn:hover {
  border-color: rgba(0, 247, 255, 0.35);
  color: var(--color-accent);
  background: rgba(0, 247, 255, 0.06);
}

.filter-btn.active {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #000;
  font-weight: 700;
}

/* ── Grid ────────────────────────────────────────── */
.portfolio-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  text-align: left;
}

/* ── Card ────────────────────────────────────────── */
.portfolio-card {
  background: rgba(255, 255, 255, 0.025);
  border-radius: var(--border-radius-lg);
  padding: 1.8rem;
  border: 1px solid rgba(255, 255, 255, 0.07);
  transition: transform 0.28s ease, box-shadow 0.28s ease, border-color 0.28s ease;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
  position: relative;
  overflow: hidden;
}

.portfolio-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  opacity: 0;
  transition: opacity 0.28s ease;
}

.portfolio-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 16px 48px rgba(0, 247, 255, 0.1);
  border-color: rgba(0, 247, 255, 0.2);
}

.portfolio-card:hover::before { opacity: 1; }

/* Card header row */
.portfolio-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.portfolio-card-meta {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

/* Project number */
.portfolio-num {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-text);
  opacity: 0.06;
  line-height: 1;
  user-select: none;
  transition: opacity 0.28s;
}

.portfolio-card:hover .portfolio-num { opacity: 0.12; }

/* Badge */
.portfolio-badge {
  padding: 0.18rem 0.6rem;
  border-radius: 100px;
  font-size: 0.67rem;
  font-weight: 700;
  letter-spacing: 0.4px;
  text-transform: uppercase;
}

.portfolio-badge.live {
  background: rgba(0, 247, 255, 0.1);
  color: var(--color-accent);
  border: 1px solid rgba(0, 247, 255, 0.28);
}

.portfolio-badge.demo {
  background: rgba(255, 200, 0, 0.1);
  color: #ffc800;
  border: 1px solid rgba(255, 200, 0, 0.3);
}

/* Category */
.portfolio-category {
  font-size: 0.72rem;
  color: var(--color-light);
  opacity: 0.45;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  font-weight: 600;
}

/* Title */
.portfolio-card h3 {
  font-size: 1.45rem;
  color: var(--color-text);
  font-weight: 700;
  margin: 0;
  line-height: 1.2;
}

/* Description */
.portfolio-card > p {
  font-size: 0.88rem;
  color: var(--color-light);
  line-height: 1.7;
  flex: 1;
  opacity: 0.78;
  margin: 0;
}

/* Tech stack */
.portfolio-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.portfolio-stack span {
  padding: 0.2rem 0.6rem;
  background: rgba(0, 247, 255, 0.06);
  border: 1px solid rgba(0, 247, 255, 0.14);
  border-radius: 4px;
  font-size: 0.7rem;
  color: var(--color-accent);
  font-weight: 600;
  letter-spacing: 0.2px;
}

/* Features */
.portfolio-features {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.1rem;
}

.portfolio-feature {
  font-size: 0.78rem;
  color: var(--color-light);
  opacity: 0.7;
  position: relative;
  padding-left: 1rem;
}

.portfolio-feature::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: 700;
  font-size: 0.75rem;
}

/* Footer */
.portfolio-card-footer {
  margin-top: auto;
  padding-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.portfolio-link {
  font-size: 0.84rem;
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  transition: gap 0.22s, opacity 0.22s;
  letter-spacing: 0.2px;
}

.portfolio-link:hover { gap: 0.6rem; }

.portfolio-link.no-link {
  opacity: 0.3;
  pointer-events: none;
  color: var(--color-light);
  font-weight: 600;
}

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