/**
 * Project Card Component Styles
 *
 * Three display levels with shared base styles.
 * Uses design tokens from tokens.css - never hardcode values.
 */

/* =============================================================================
   BASE CARD STYLES
   ============================================================================= */

.project-card {
  --card-bg: var(--color-surface);
  --card-bg-hover: var(--color-surface-soft);
  --card-radius: var(--radius-lg);
  --card-padding: var(--space-4);

  position: relative;
  border-radius: var(--card-radius);
  background: var(--card-bg);
  transition: background var(--transition-fast),
              transform var(--transition-fast),
              box-shadow var(--transition-fast);
}

.project-card:hover {
  background: var(--card-bg-hover);
}

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

.project-card__title {
  margin: 0;
  color: var(--color-text);
  font-weight: 600;
  line-height: var(--leading-snug);
}

.project-card__summary {
  margin: var(--space-2) 0 0;
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.project-card__tags .tag {
  padding: var(--space-1) var(--space-2);
  background: var(--color-surface-soft);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
}

.project-card__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-4);
  color: var(--color-accent);
  font-size: var(--text-sm);
  font-weight: 500;
}

.project-card__cta::after {
  content: "→";
  transition: transform var(--transition-fast);
}

.project-card:hover .project-card__cta::after {
  transform: translateX(4px);
}

.project-card__external {
  display: inline-block;
  margin-left: var(--space-1);
  font-size: 0.75em;
  opacity: 0.5;
  vertical-align: super;
}

.project-card:hover .project-card__external {
  opacity: 1;
}

.project-card__media {
  overflow: hidden;
  border-radius: var(--radius-md);
  background: var(--color-bg);
}

.project-card__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-base);
}

.project-card:hover .project-card__media img {
  transform: scale(1.02);
}

/* =============================================================================
   LEVEL 1: LARGE CARD
   ============================================================================= */

.project-card--large {
  --card-padding: var(--space-6);
}

.project-card--large .project-card__link {
  padding: var(--card-padding);
}

.project-card--large .project-card__media {
  aspect-ratio: 16 / 9;
  margin-bottom: var(--space-4);
}

.project-card--large .project-card__title {
  font-size: var(--text-2xl);
}

.project-card--large .project-card__summary {
  font-size: var(--text-base);
  max-width: 60ch;
}

/* =============================================================================
   LEVEL 2: MEDIUM CARD
   ============================================================================= */

.project-card--medium {
  --card-padding: var(--space-4);
}

.project-card--medium .project-card__link {
  display: flex;
  flex-direction: column;
  padding: var(--card-padding);
}

.project-card--medium .project-card__title {
  font-size: var(--text-lg);
}

.project-card--medium .project-card__summary {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Expanded content (shown on hover/focus) */
.project-card--medium .project-card__expanded {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--transition-base);
  overflow: hidden;
}

.project-card--medium .project-card__expanded > * {
  overflow: hidden;
}

.project-card--medium:hover .project-card__expanded,
.project-card--medium:focus-within .project-card__expanded {
  grid-template-rows: 1fr;
}

.project-card--medium .project-card__media {
  aspect-ratio: 16 / 9;
  margin-top: var(--space-4);
  max-height: 200px;
}

/* =============================================================================
   LEVEL 3: SMALL (ICON ONLY)
   ============================================================================= */

.project-icon {
  --icon-size: 48px;

  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--icon-size);
  height: var(--icon-size);
  padding: var(--space-2);
  background: var(--color-surface);
  border-radius: var(--radius-md);
  transition: transform var(--transition-fast),
              background var(--transition-fast),
              box-shadow var(--transition-fast);
}

.project-icon:hover {
  transform: scale(1.1);
  background: var(--color-surface-soft);
  box-shadow: var(--shadow-sm);
}

.project-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

/* Tooltip */
.project-icon__tooltip {
  position: absolute;
  bottom: calc(100% + var(--space-2));
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  padding: var(--space-1) var(--space-2);
  background: var(--color-surface);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  color: var(--color-text);
  white-space: nowrap;
  box-shadow: var(--shadow-sm);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast),
              transform var(--transition-fast);
}

.project-icon:hover .project-icon__tooltip,
.project-icon:focus .project-icon__tooltip {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* =============================================================================
   ICON GRID
   ============================================================================= */

.project-icon-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  padding: var(--space-4) 0;
}

/* =============================================================================
   CARD GROUPS
   ============================================================================= */

.project-card-group {
  display: grid;
  gap: var(--space-4);
}

.project-card-group--level-1 {
  gap: var(--space-6);
}

.project-card-group--level-2 {
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}

/* =============================================================================
   RESPONSIVE
   ============================================================================= */

@media (max-width: 720px) {
  .project-card--large {
    --card-padding: var(--space-4);
  }

  .project-card--large .project-card__title {
    font-size: var(--text-xl);
  }

  .project-card--medium .project-card__expanded {
    /* Always show expanded on mobile */
    grid-template-rows: 1fr;
  }

  .project-icon {
    --icon-size: 40px;
  }
}

/* =============================================================================
   REVEAL ANIMATION
   ============================================================================= */

.project-card.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-slow),
              transform var(--transition-slow),
              background var(--transition-fast);
}

.project-card.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}