/* =============================================================
   PORTFOLIO — Phase 6: Student Portfolio Showcase (#student-work)
   KPI mini-dashboard + ARIA tabs + project cards. Theme-aware via
   design tokens; mobile-first.
   ============================================================= */

/* ── KPI mini-dashboard (3 cards, thin accent left border) ───── */
.portfolio-kpis {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin-bottom: var(--space-12);
}
.portfolio-kpi {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-md);
  padding: var(--space-5) var(--space-6);
  box-shadow: var(--shadow-sm);
}
.portfolio-kpi__num {
  display: block;
  font-family: var(--font-display);
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-extrabold);
  line-height: 1;
  color: var(--color-text-dark);
}
.portfolio-kpi__label {
  display: block;
  margin-top: var(--space-2);
  font-size: var(--font-size-sm);
  color: var(--color-text-medium);
  line-height: var(--line-height-normal);
}

/* ── Tabs ────────────────────────────────────────────────────── */
.portfolio-tablist {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-8);
}
.portfolio-tab {
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-medium);
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  padding: var(--space-3) var(--space-4);
  margin-bottom: -1px;                 /* overlap the tablist border */
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.portfolio-tab:hover { color: var(--color-text-dark); }
.portfolio-tab[aria-selected="true"] {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}
.portfolio-tab:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.portfolio-panel:focus-visible { outline: none; }

/* ── Project cards ───────────────────────────────────────────── */
.project-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}
.project-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}
.project-card:hover,
.project-card:focus-within {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}
.project-card__image {
  position: relative;
  aspect-ratio: 16 / 10;
  background: var(--color-off-white);
  overflow: hidden;
}
.project-card__image img { width: 100%; height: 100%; object-fit: cover; }
.project-card__ph {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  background: linear-gradient(135deg, var(--color-primary), var(--color-background-mid));
}
.project-card__overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(3, 13, 26, 0.55);
  opacity: 0;
  transition: opacity 0.25s ease;
}
.project-card:hover .project-card__overlay,
.project-card:focus-within .project-card__overlay { opacity: 1; }
.project-card__overlay a {
  font-weight: var(--font-weight-bold);
  color: var(--color-white);
  border: 2px solid var(--color-white);
  border-radius: var(--radius-pill);
  padding: var(--space-2) var(--space-5);
}
.project-card__overlay a:hover,
.project-card__overlay a:focus-visible {
  background: var(--color-white);
  color: var(--color-primary);
}
.project-card__title {
  font-family: var(--font-display);
  font-size: var(--font-size-lg);
  color: var(--color-text-dark);
  padding: var(--space-5) var(--space-5) 0;
}
.project-card__student {
  font-family: var(--font-mono, monospace);
  font-size: var(--font-size-xs);
  color: var(--color-accent);
  padding: var(--space-1) var(--space-5) 0;
}
.project-card__description {
  font-size: var(--font-size-sm);
  color: var(--color-text-medium);
  line-height: var(--line-height-normal);
  padding: var(--space-2) var(--space-5) var(--space-6);
}

/* ── Empty-state (placeholder) panel ─────────────────────────── */
.portfolio-empty {
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-12) var(--space-6);
  text-align: center;
  color: var(--color-text-medium);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
}

/* ── Breakpoints ─────────────────────────────────────────────── */
@media (min-width: 640px) {
  .project-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 768px) {
  .portfolio-kpis { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 1024px) {
  .project-grid { grid-template-columns: repeat(3, 1fr); }
}

/* ── Reduced motion ──────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .project-card,
  .project-card__overlay,
  .portfolio-tab { transition: none; }
  .project-card:hover,
  .project-card:focus-within { transform: none; }
}