/**
 * PDG Projects List CSS
 * Page-specific styles for the projects list page.
 * Requirements: 3.1, 3.2, 3.5, 5.1, 5.2, 5.3, 5.4, 5.5, 7.1, 7.3, 1.1-1.10, 16.1-16.3
 */

/* =============================================================
   PROJECTS HERO
   ============================================================= */
.projects-hero {
  padding: 8rem 0 4rem;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.projects-hero__inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.projects-hero__title {
  font-family: var(--font-heading);
  font-size: clamp(3rem, 6vw, 5rem);
  font-weight: var(--font-weight-bold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--color-fg);
  max-width: 10ch;
  text-wrap: balance;
}

.projects-hero__desc {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
  color: var(--color-fg-muted);
  max-width: 560px;
}

/* =============================================================
   FILTER BAR
   Requirements: 7.1, 7.3
   ============================================================= */
.projects-filter {
  padding: 2rem 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  align-items: center;
}

.projects-filter .filter-chip {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-fg-muted);
}

.projects-filter .filter-chip.is-active {
  background: transparent;
  color: var(--color-fg);
  border-color: var(--color-fg);
}

.projects-filter .filter-chip:hover:not(.is-active),
.projects-filter .filter-chip:focus-visible {
  color: var(--color-fg);
  border-color: var(--color-fg);
  transform: none;
}

/* =============================================================
   PROJECTS GRID
   Requirements: 3.1, 3.2, 16.1-16.3
   ============================================================= */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  padding: 4rem 0;
}

/* =============================================================
   PROJECT CARD
   Requirements: 3.1, 3.2, 1.9
   ============================================================= */
.projects-card {
  border-top: 2px solid var(--color-border);
  background: transparent;
  transition:
    border-top-color var(--duration-functional) var(--ease-functional),
    background-color var(--duration-functional) var(--ease-functional);
}

.projects-card:hover {
  border-top-color: var(--color-accent);
  background: rgba(242, 240, 237, 0.36);
}

.projects-card:focus-within {
  border-top-color: var(--color-accent);
  background: rgba(242, 240, 237, 0.36);
}

.projects-card[hidden] {
  display: none;
}

.projects-card__link {
  display: block;
  text-decoration: none;
  color: inherit;
}

/* Image wrap */
.projects-card__image {
  aspect-ratio: 4 / 3;
  overflow: hidden;
  position: relative;
}

.projects-card__image .pdg-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Data bar: revealed on hover */
.projects-card__data-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(249, 248, 246, 0.88);
  backdrop-filter: blur(12px);
  border-top: 1px solid rgba(26, 26, 26, 0.08);
  display: flex;
  gap: 1.5rem;
  padding: 0.75rem 1rem;
  opacity: 0.94;
  transform: translateY(0.25rem);
  transition:
    opacity var(--duration-functional) ease-out,
    transform var(--duration-functional) ease-out;
  flex-wrap: wrap;
}

.projects-card:hover .projects-card__data-bar,
.projects-card:focus-within .projects-card__data-bar {
  opacity: 1;
  transform: translateY(0);
}

.projects-card__data-item {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
}

.projects-card__data-label {
  font-size: 0.65rem;
  font-family: var(--font-body);
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(26, 26, 26, 0.44);
  line-height: 1.2;
}

.projects-card__data-value {
  font-size: 0.75rem;
  font-family: var(--font-body);
  font-weight: var(--font-weight-medium);
  color: var(--color-fg);
  line-height: 1.2;
}

/* Card body */
.projects-card__body {
  padding: 1.5rem 0;
}

.projects-card__body .kicker {
  margin-bottom: var(--space-1);
}

.projects-card__title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: var(--font-weight-bold);
  line-height: var(--leading-tight);
  color: var(--color-fg);
  margin-bottom: var(--space-2);
  transition: color var(--duration-functional) var(--ease-functional);
  text-wrap: balance;
}

.projects-card:hover .projects-card__title {
  color: var(--color-accent);
}

.projects-card:focus-within .projects-card__title {
  color: var(--color-accent);
}

.projects-card__excerpt {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-fg-muted);
  margin-bottom: var(--space-3);
}

.projects-card__cta {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-fg);
  transition: color var(--duration-functional) var(--ease-functional);
}

.projects-card:hover .projects-card__cta {
  color: var(--color-accent);
}

.projects-card:focus-within .projects-card__cta {
  color: var(--color-accent);
}

@media (hover: none), (pointer: coarse) {
  .projects-card__data-bar {
    opacity: 1;
    transform: none;
    background: rgba(249, 248, 246, 0.92);
  }
}

/* =============================================================
   RESPONSIVE: TABLET (768px – 1023px)
   Requirements: 16.1, 16.2, 16.3
   ============================================================= */
@media (max-width: 1023px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }
}

/* =============================================================
   RESPONSIVE: MOBILE (< 768px)
   Requirements: 16.1, 16.2, 16.3, 16.5
   ============================================================= */
@media (max-width: 767px) {
  .projects-hero {
    padding: 6rem 0 3rem;
  }

  .projects-hero__title {
    font-size: clamp(2.35rem, 12vw, 3.75rem);
    max-width: 8ch;
  }

  .projects-hero__desc {
    font-size: var(--text-base);
  }

  .projects-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    padding: 2rem 0;
  }

  .projects-filter {
    gap: 0.5rem;
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 0.25rem;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }

  .projects-filter::-webkit-scrollbar {
    display: none;
  }

  .projects-card__data-bar {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.75rem 1rem;
  }

  /* Touch targets: min 44px */
  .filter-chip {
    min-height: 44px;
  }
}

@media (max-width: 479px) {
  .projects-hero {
    padding: 5.5rem 0 2.5rem;
  }

  .projects-card__image {
    aspect-ratio: 6 / 5;
  }

  .projects-card__data-bar {
    padding: 0.625rem 0.75rem;
    gap: 0.625rem 0.75rem;
  }

  .projects-card__title {
    font-size: 1.125rem;
  }
}

/* =============================================================
   REDUCED MOTION
   ============================================================= */
@media (prefers-reduced-motion: reduce) {
  .projects-card,
  .projects-card__data-bar,
  .projects-card__title,
  .projects-card__cta {
    transition: none;
  }
}