/*
 * static/css/pages/engagement.css
 * =================================
 * Styles for Content Engagement features (Phase 11):
 *   - Next / Previous post navigation
 *   - Recently Viewed widget
 *   - Post cluster + collection chips
 *   - Trending widget (sidebar)
 *   - Collections strip (homepage)
 *   - Topic clusters strip (homepage)
 */

/* ─────────────────────────────────────────────── */
/* Next / Previous Navigation                       */
/* ─────────────────────────────────────────────── */

.next-prev-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 3rem;
  margin-bottom: 1.5rem;
}

.next-prev-nav__item {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 1.25rem 1.5rem;
  background: #fff;
  border: 1.5px solid #eee;
  border-radius: 14px;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.25s, box-shadow 0.25s, transform 0.2s;
  position: relative;
  overflow: hidden;
}

.next-prev-nav__item::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, hsl(170 50% 97%), hsl(170 30% 94%));
  opacity: 0;
  transition: opacity 0.25s;
}

.next-prev-nav__item:hover {
  border-color: var(--color-primary, #63D3C6);
  box-shadow: 0 4px 20px rgba(99, 211, 198, 0.15);
  transform: translateY(-2px);
}

.next-prev-nav__item:hover::before { opacity: 1; }

.next-prev-nav__item--next { text-align: right; }

.next-prev-nav__label {
  position: relative;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary, #63D3C6);
}

.next-prev-nav__title {
  position: relative;
  font-size: 0.92rem;
  font-weight: 600;
  color: #1a1a1a;
  line-height: 1.4;
}

.next-prev-nav__cat {
  position: relative;
  font-size: 0.72rem;
  color: #aaa;
}

@media (max-width: 576px) {
  .next-prev-nav {
    grid-template-columns: 1fr;
  }
  .next-prev-nav__item--next { text-align: left; }
}

/* ─────────────────────────────────────────────── */
/* Recently Viewed Widget                           */
/* ─────────────────────────────────────────────── */

.recently-viewed {
  background: #fff;
  border: 1.5px solid #eee;
  border-radius: 14px;
  padding: 1.25rem;
  margin-bottom: 1.5rem;
}

.recently-viewed__title {
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #666;
  margin-bottom: 0.8rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.recently-viewed__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.recently-viewed__item { margin: 0; }

.recently-viewed__link {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
  color: inherit;
  transition: opacity 0.2s;
}

.recently-viewed__link:hover { opacity: 0.75; }

.recently-viewed__thumb {
  width: 52px;
  height: 40px;
  object-fit: cover;
  border-radius: 6px;
  flex-shrink: 0;
  background: #f0f0f0;
}

.recently-viewed__thumb--placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ccc;
  font-size: 1.1rem;
}

.recently-viewed__body {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  min-width: 0;
}

.recently-viewed__post-title {
  font-size: 0.8rem;
  font-weight: 600;
  color: #1a1a1a;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  display: block;
}

.recently-viewed__cat {
  font-size: 0.68rem;
  color: var(--color-primary, #63D3C6);
  font-weight: 600;
}

/* ─────────────────────────────────────────────── */
/* Post Cluster + Collection Chips                  */
/* ─────────────────────────────────────────────── */

.post-meta-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.5rem 0 2rem;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.85rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s;
}

.chip:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0,0,0,.1);
}

.chip--cluster {
  background: color-mix(in srgb, var(--chip-color, #63D3C6) 15%, transparent);
  color: color-mix(in srgb, var(--chip-color, #63D3C6) 80%, #000);
  border: 1px solid color-mix(in srgb, var(--chip-color, #63D3C6) 35%, transparent);
}

.chip--collection {
  background: hsl(40 80% 95%);
  color: hsl(40 50% 35%);
  border: 1px solid hsl(40 50% 85%);
}

/* ─────────────────────────────────────────────── */
/* Homepage Collections Strip                       */
/* ─────────────────────────────────────────────── */

.collections-strip {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.collection-card {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  padding: 1.75rem 1.5rem;
  text-decoration: none;
  color: #fff;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  min-height: 140px;
  background: linear-gradient(
    135deg,
    var(--col-bg, #20423D) 0%,
    color-mix(in srgb, var(--col-bg, #20423D) 70%, #000) 100%
  );
  transition: transform 0.25s, box-shadow 0.25s;
}

.collection-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0,0,0,.2);
  color: #fff;
}

.collection-card__emoji {
  font-size: 2rem;
  line-height: 1;
  margin-bottom: 0.25rem;
}

.collection-card__name {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.3;
  font-family: var(--font-heading, Georgia, serif);
}

.collection-card__label {
  font-size: 0.7rem;
  opacity: 0.7;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: auto;
}

/* ─────────────────────────────────────────────── */
/* Homepage Clusters Strip                          */
/* ─────────────────────────────────────────────── */

.clusters-strip {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.cluster-card {
  padding: 1.5rem;
  border-radius: 14px;
  background: #fff;
  border: 2px solid var(--cluster-border, #63D3C6);
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}

.cluster-card:hover {
  border-color: var(--cluster-border, #63D3C6);
  box-shadow: 0 8px 24px rgba(0,0,0,.08);
  transform: translateY(-3px);
}

.cluster-card__name {
  font-weight: 700;
  font-size: 0.95rem;
  color: #1a1a1a;
}

.cluster-card__count {
  font-size: 0.72rem;
  color: #aaa;
}

/* ─────────────────────────────────────────────── */
/* Reading Progress Bar (enhanced)                  */
/* ─────────────────────────────────────────────── */

.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary, #63D3C6), #20423D);
  z-index: 9999;
  transition: width 0.1s linear;
  pointer-events: none;
}

/* ─────────────────────────────────────────────── */
/* Print                                            */
/* ─────────────────────────────────────────────── */

@media print {
  .next-prev-nav,
  .recently-viewed,
  .collections-strip,
  .clusters-strip { display: none !important; }
}