/*
 * portfolio.css
 * ─────────────────────────────────────────────────────────
 * LEARNER NOTE:
 * Portfolio cards are laid out in a CSS Grid.
 * Each card has a colored thumbnail, title, and category.
 * The filter tabs hide/show cards by adding a .hidden class
 * via JavaScript (filter.js) — no page reload needed.
 *
 * The hover overlay uses opacity transition for a smooth
 * "peek" effect — a common, clean UX pattern.
 * ─────────────────────────────────────────────────────────
 */

/* ── Filter tabs ── */
.filter-tabs {
  display: flex;
  gap: var(--sp-2);
  flex-wrap: wrap;
  margin-bottom: var(--sp-5);
}

.filter-btn {
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--clr-text-muted);
  padding: var(--sp-1) var(--sp-4);
  border-radius: var(--radius-full);
  border: 1px solid var(--clr-border);
  background: transparent;
  transition: all var(--dur-base) var(--ease-smooth);
}

.filter-btn:hover {
  color: var(--clr-white);
  border-color: var(--clr-accent);
}

.filter-btn.active {
  background: var(--clr-accent);
  color: var(--clr-white);
  border-color: var(--clr-accent);
}

/* ── Portfolio grid: 3 columns, matching reference ── */
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-3);
}

@media (max-width: 620px) {
  .portfolio-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 400px) {
  .portfolio-grid { grid-template-columns: 1fr; }
}

/* ── Individual card ── */
.portfolio-card {
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--clr-surface-2);
  border: 1px solid var(--clr-border);
  cursor: pointer;
  transition: transform var(--dur-base) var(--ease-smooth),
              box-shadow var(--dur-base) var(--ease-smooth),
              border-color var(--dur-base) var(--ease-smooth);
}

.portfolio-card:hover {
  transform: translateY(-5px) scale(1.01);
  box-shadow: var(--shadow-accent);
  border-color: var(--clr-accent);
}

/* ── Card thumbnail area ── */
.portfolio-card__thumb {
  height: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  background: var(--clr-surface);
}

.portfolio-card__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Hover overlay shimmer */
.portfolio-card__thumb::after {
  content: '→ View';
  position: absolute;
  inset: 0;
  background: rgba(108,99,255,0.55);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-sm);
  color: var(--clr-white);
  letter-spacing: 0.06em;
  opacity: 0;
  transition: opacity var(--dur-base) var(--ease-smooth);
}

.portfolio-card:hover .portfolio-card__thumb::after {
  opacity: 1;
}

/* ── Card info footer ── */
.portfolio-card__info {
  padding: var(--sp-3) var(--sp-3);
}

.portfolio-card__info h4 {
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--clr-white);
  margin-bottom: 2px;
}

.portfolio-card__info p {
  font-size: var(--fs-xs);
  color: var(--clr-text-muted);
}

/* ── Hidden state (used by filter JS) ── */
.portfolio-card.hidden {
  display: none;
}

/* ── Lightbox Modal ── */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(0, 0, 0, 0.9);
  align-items: center;
  justify-content: center;
  padding: var(--sp-4);
}

.lightbox.active {
  display: flex;
}

.lightbox__content {
  position: relative;
  max-width: 90vw;
  max-height: 90vh;
}

.lightbox__image {
  max-width: 100%;
  max-height: 90vh;
  object-fit: contain;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-accent);
}

.lightbox__close {
  position: absolute;
  top: -40px;
  right: 0;
  background: none;
  border: none;
  color: var(--clr-white);
  font-size: 2rem;
  cursor: pointer;
  padding: var(--sp-1);
  line-height: 1;
  transition: color var(--dur-base) var(--ease-smooth);
}

.lightbox__close:hover {
  color: var(--clr-accent);
}

@media (max-width: 620px) {
  .lightbox__close {
    top: var(--sp-2);
    right: var(--sp-2);
    font-size: 1.5rem;
  }
}

/* ── Light Mode ── */
html.light-mode .filter-btn:hover {
  color: #1a1a2e;
}

html.light-mode .portfolio-card {
  background: #ffffff;
  border-color: rgba(0,0,0,0.10);
}

html.light-mode .portfolio-card__info h4 {
  color: #1a1a2e;
}

html.light-mode .portfolio-card__info p {
  color: #5a5a70;
}

html.light-mode .portfolio-card__thumb {
  background: #ebebf0;
}