/* ═══════════════════════════════════════
   ZG PDF Library v2.0 — Frontend Styles
═══════════════════════════════════════ */

.zg-pdf-library { width: 100%; }

/* ── Section Heading ── */
.zg-pdf-section-heading {
  text-align: center;
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 700;
  color: #1a1a1a;
  margin: 0 0 28px;
}

/* ── Filter Bar ── */
.zg-pdf-filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  justify-content: center;
  margin-bottom: 32px;
}

.zg-filter-btn {
  display: inline-flex;
  align-items: center;
  padding: 7px 20px;
  background: transparent;
  border: 1.5px solid #d0d0d0;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  color: #555;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
  text-decoration: none;
  line-height: 1;
  font-family: inherit;
}
.zg-filter-btn:hover,
.zg-filter-btn.active {
  background: #1a1a1a;
  color: #fff;
  border-color: #1a1a1a;
}

/* ── Grid ── */
.zg-pdf-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

/* ── Card ── */
.zg-pdf-card {
  background: #fff;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  position: relative;
  display: flex;
  flex-direction: column;
}
.zg-pdf-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.14);
}

/* ── Cover ── */
.zg-pdf-cover-wrap {
  position: relative;
  overflow: hidden;
  height: 380px;
  background: #111;
  flex-shrink: 0;
}
.zg-pdf-cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
  transition: transform 0.35s ease;
}
.zg-pdf-card:hover .zg-pdf-cover { transform: scale(1.04); }

/* ── Hover Overlay ── */
.zg-pdf-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.25s ease;
}
.zg-pdf-card:hover .zg-pdf-overlay { opacity: 1; }

.zg-pdf-preview-btn {
  color: #fff;
  background: rgba(255,255,255,0.15);
  border: 1.5px solid rgba(255,255,255,0.7);
  padding: 10px 24px;
  border-radius: 999px;
  font-size: 14px;
  text-decoration: none;
  backdrop-filter: blur(6px);
  transition: background 0.2s;
}
.zg-pdf-preview-btn:hover { background: rgba(255,255,255,0.3); color: #fff; }

/* ── Badge ── */
.zg-pdf-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background: #e74c3c;
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 999px;
  z-index: 2;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

/* ── Card Info ── */
.zg-pdf-info {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.zg-pdf-title {
  font-size: 15px;
  font-weight: 700;
  color: #1a1a1a;
  margin: 0;
  line-height: 1.4;
}

.zg-pdf-author {
  font-size: 13px;
  color: #888;
  margin: 0;
}

.zg-pdf-excerpt {
  font-size: 13px;
  color: #666;
  margin: 0;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.zg-pdf-meta-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.zg-pdf-price {
  font-size: 14px;
  font-weight: 600;
  color: #1a1a1a;
  display: inline-block;
}

.zg-pdf-downloads {
  font-size: 12px;
  color: #aaa;
}

/* ── Download Button ── */
.zg-pdf-btn {
  display: block;
  width: 100%;
  text-align: center;
  padding: 11px 16px;
  background: #fff;
  color: #1a1a1a;
  border: 1.5px solid #d0d0d0;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
  cursor: pointer;
  margin-top: auto;
  box-sizing: border-box;
}
.zg-pdf-btn:hover {
  background: #1a1a1a;
  color: #fff;
  border-color: #1a1a1a;
}

/* ── Load More ── */
.zg-load-more-wrap {
  text-align: center;
  margin-top: 40px;
}
.zg-load-more-btn {
  display: inline-block;
  padding: 14px 44px;
  background: #1a1a1a;
  color: #fff;
  border: none;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  letter-spacing: 0.5px;
  transition: opacity 0.2s, transform 0.2s;
  font-family: inherit;
}
.zg-load-more-btn:hover  { opacity: 0.82; transform: translateY(-2px); }
.zg-load-more-btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none; }

/* ── Empty ── */
.zg-pdf-none {
  text-align: center;
  color: #aaa;
  padding: 60px 20px;
  grid-column: 1 / -1;
  font-size: 15px;
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .zg-pdf-grid:not([style*="grid-template-columns"]) { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .zg-pdf-grid:not([style*="grid-template-columns"]) { grid-template-columns: 1fr; }
  .zg-pdf-cover-wrap { height: 280px; }
  .zg-filter-btn { font-size: 13px; padding: 6px 16px; }
}