/* ═══════════════════════════════════════════════════════════════════════
   STUDYRIA — PDF PDP V4 UI UPGRADE CSS
   V4.0 — 2026-08-02
   Review redesign, related card fix, badges, recently viewed, banners
   ═══════════════════════════════════════════════════════════════════════ */

/* ══════════════════════════════════════════════════════════════════
   1. REVIEW SECTION — Modern Card UI, Glassmorphism, AMOLED
   ══════════════════════════════════════════════════════════════════ */

/* Review summary block */
.v4-rev-summary {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  flex-wrap: wrap;
  margin-bottom: 20px;
  padding: 24px;
  border-radius: 16px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(12px) saturate(140%);
  -webkit-backdrop-filter: blur(12px) saturate(140%);
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}

.v4-rev-score {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  min-width: 120px;
}
.v4-rev-score-num {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1;
  background: linear-gradient(135deg, #f59e0b, #f97316);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.v4-rev-score-stars {
  display: flex;
  gap: 2px;
  font-size: 1.1rem;
  color: #f59e0b;
}
.v4-rev-score-total {
  font-size: 0.72rem;
  color: var(--text2);
  font-weight: 600;
}

.v4-rev-breakdown {
  flex: 1;
  min-width: 200px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.v4-rev-bar-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.72rem;
}
.v4-rev-bar-lbl {
  width: 28px;
  color: var(--text2);
  font-weight: 700;
  text-align: right;
}
.v4-rev-bar-track {
  flex: 1;
  height: 8px;
  border-radius: 4px;
  background: var(--bg3);
  overflow: hidden;
}
.v4-rev-bar-fill {
  height: 100%;
  border-radius: 4px;
  background: linear-gradient(90deg, #f59e0b, #fbbf24);
  transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}
.v4-rev-bar-pct {
  width: 36px;
  color: var(--text3);
  font-weight: 600;
  text-align: left;
}

/* Review filters */
.v4-rev-filters {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.v4-rev-filter {
  padding: 6px 14px;
  border-radius: 20px;
  border: 1px solid var(--glass-border);
  background: var(--glass);
  color: var(--text2);
  font-size: 0.72rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font-body, sans-serif);
  -webkit-tap-highlight-color: transparent;
}
.v4-rev-filter:hover {
  border-color: var(--accent, #930205);
  color: var(--text);
}
.v4-rev-filter.active {
  background: var(--accent, #930205);
  color: #fff;
  border-color: var(--accent, #930205);
}

/* Review cards */
.v4-rev-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.v4-rev-card {
  padding: 18px;
  border-radius: 14px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(10px) saturate(130%);
  -webkit-backdrop-filter: blur(10px) saturate(130%);
  box-shadow: 0 4px 20px rgba(0,0,0,0.2);
  transition: border-color 0.2s, box-shadow 0.2s;
}
.v4-rev-card:hover {
  border-color: rgba(147,2,5,0.3);
  box-shadow: 0 6px 28px rgba(0,0,0,0.3), 0 0 0 1px rgba(147,2,5,0.08);
}

.v4-rev-top {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 10px;
}
.v4-rev-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent, #930205), #8b5cf6);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
  font-weight: 800;
  color: #fff;
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(147,2,5,0.3);
}

.v4-rev-info {
  flex: 1;
  min-width: 0;
}
.v4-rev-name-row {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}
.v4-rev-name {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text);
}
.v4-rev-verified {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-size: 0.58rem;
  font-weight: 700;
  color: var(--success, #10d98e);
  padding: 2px 7px;
  border-radius: 10px;
  background: rgba(16,217,142,0.1);
  border: 1px solid rgba(16,217,142,0.25);
}
.v4-rev-date {
  font-size: 0.66rem;
  color: var(--text3);
  margin-top: 2px;
}
.v4-rev-city {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  font-size: 0.66rem;
  color: var(--text3);
}

.v4-rev-stars {
  display: flex;
  gap: 1px;
  font-size: 0.85rem;
  color: #f59e0b;
  flex-shrink: 0;
}
.v4-rev-stars .empty { color: var(--text3); opacity: 0.4; }

.v4-rev-body {
  font-size: 0.82rem;
  line-height: 1.65;
  color: var(--text2);
  margin-bottom: 10px;
}

.v4-rev-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--glass-border);
}
.v4-rev-helpful {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  border-radius: 8px;
  border: 1px solid var(--glass-border);
  background: var(--bg3);
  color: var(--text2);
  font-size: 0.7rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font-body, sans-serif);
  -webkit-tap-highlight-color: transparent;
}
.v4-rev-helpful:hover, .v4-rev-helpful.voted {
  border-color: var(--accent, #930205);
  color: var(--accent, #930205);
  background: rgba(147,2,5,0.08);
}
.v4-rev-helpful svg { width: 12px; height: 12px; }

.v4-rev-report {
  font-size: 0.66rem;
  color: var(--text3);
  cursor: pointer;
  transition: color 0.2s;
  background: none;
  border: none;
  font-family: var(--font-body, sans-serif);
  -webkit-tap-highlight-color: transparent;
}
.v4-rev-report:hover { color: var(--danger, #ef4444); }

/* Review form */
.v4-rev-form {
  padding: 20px;
  border-radius: 14px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(10px);
  margin-top: 16px;
}
.v4-rev-form-title {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text);
}
.v4-star-sel {
  display: flex;
  gap: 4px;
  margin-bottom: 12px;
}
.v4-star-sel button {
  background: none;
  border: none;
  font-size: 1.6rem;
  color: var(--text3);
  cursor: pointer;
  transition: color 0.15s, transform 0.15s;
  -webkit-tap-highlight-color: transparent;
}
.v4-star-sel button:hover { transform: scale(1.15); }
.v4-star-sel button.active { color: #f59e0b; }
.v4-rev-textarea {
  width: 100%;
  min-height: 80px;
  padding: 12px 14px;
  border-radius: 10px;
  background: var(--bg3);
  border: 1px solid var(--glass-border);
  color: var(--text);
  font-family: var(--font-body, sans-serif);
  font-size: 0.82rem;
  resize: vertical;
  outline: none;
  transition: border-color 0.2s;
}
.v4-rev-textarea:focus { border-color: var(--accent, #930205); }
.v4-rev-submit {
  margin-top: 12px;
  padding: 10px 24px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent, #930205), #8b5cf6);
  border: none;
  color: #fff;
  font-weight: 700;
  font-size: 0.82rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: opacity 0.2s, transform 0.15s;
  font-family: var(--font-body, sans-serif);
}
.v4-rev-submit:hover { opacity: 0.9; transform: translateY(-1px); }
.v4-rev-submit:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.v4-rev-login {
  padding: 16px;
  border-radius: 14px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  text-align: center;
  font-size: 0.82rem;
  color: var(--text2);
}
.v4-rev-login a { color: var(--accent, #930205); cursor: pointer; font-weight: 700; }

/* Skeleton loading for reviews */
.v4-rev-skeleton {
  padding: 18px;
  border-radius: 14px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  display: flex;
  gap: 12px;
  margin-bottom: 12px;
}
.v4-skel-circle {
  width: 40px; height: 40px; border-radius: 50%;
  background: linear-gradient(90deg, var(--bg3), var(--glass), var(--bg3));
  background-size: 200% 100%;
  animation: v4shimmer 1.5s infinite;
  flex-shrink: 0;
}
.v4-skel-line {
  height: 10px;
  border-radius: 5px;
  background: linear-gradient(90deg, var(--bg3), var(--glass), var(--bg3));
  background-size: 200% 100%;
  animation: v4shimmer 1.5s infinite;
  margin-bottom: 6px;
}
.v4-skel-line.short { width: 40%; }
.v4-skel-line.med { width: 70%; }
.v4-skel-line.long { width: 100%; }
@keyframes v4shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ══════════════════════════════════════════════════════════════════
   2. RELATED PDF CARDS — Fixed sizing, equal height, carousel
   ══════════════════════════════════════════════════════════════════ */
.pdp-related-track {
  display: flex;
  gap: 14px;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 4px 0 12px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--glass-border) transparent;
  scroll-snap-type: x proximity;
}

/* Fix: every card in related track gets identical dimensions */
.pdp-related-track .pdf-card {
  flex: 0 0 200px;
  width: 200px;
  min-height: 320px;
  max-height: 380px;
  scroll-snap-align: start;
}
@media (max-width: 480px) {
  .pdp-related-track .pdf-card {
    flex: 0 0 160px;
    width: 160px;
    min-height: 280px;
    max-height: 340px;
  }
}

/* Fix: cover image always same ratio */
.pdp-related-track .pdf-cover {
  aspect-ratio: 3 / 4;
  width: 100%;
  height: auto;
}
.pdp-related-track .pdf-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Fix: card body consistent height */
.pdp-related-track .pdf-card-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 10px 12px;
}
.pdp-related-track .pdf-title {
  font-size: 0.78rem;
  line-height: 1.3;
  max-height: 2.2em;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
.pdp-related-track .pdf-card-actions {
  margin-top: auto;
}

/* ══════════════════════════════════════════════════════════════════
   3. BADGES — Premium, Best Seller, New, Trending, Safe Download
   ══════════════════════════════════════════════════════════════════ */
.v4-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 9px;
  border-radius: 12px;
  font-size: 0.62rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  white-space: nowrap;
}
.v4-badge-premium {
  background: linear-gradient(135deg, rgba(139,92,246,0.18), rgba(99,102,241,0.12));
  color: #a78bfa;
  border: 1px solid rgba(139,92,246,0.3);
}
.v4-badge-bestseller {
  background: linear-gradient(135deg, rgba(245,158,11,0.18), rgba(251,146,60,0.12));
  color: #fbbf24;
  border: 1px solid rgba(245,158,11,0.3);
}
.v4-badge-new {
  background: linear-gradient(135deg, rgba(16,217,142,0.18), rgba(34,197,94,0.12));
  color: var(--success, #10d98e);
  border: 1px solid rgba(16,217,142,0.3);
}
.v4-badge-trending {
  background: linear-gradient(135deg, rgba(239,68,68,0.18), rgba(248,113,113,0.12));
  color: #f87171;
  border: 1px solid rgba(239,68,68,0.3);
}
.v4-badge-safe {
  background: linear-gradient(135deg, rgba(147,2,5,0.18), rgba(201,154,60,0.12));
  color: var(--accent, #930205);
  border: 1px solid rgba(147,2,5,0.3);
}

/* ══════════════════════════════════════════════════════════════════
   4. SECURE PURCHASE BANNER
   ══════════════════════════════════════════════════════════════════ */
.v4-secure-banner {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(16,217,142,0.06), rgba(147,2,5,0.04));
  border: 1px solid rgba(16,217,142,0.15);
  margin-bottom: 16px;
}
.v4-secure-banner svg {
  width: 20px; height: 20px;
  color: var(--success, #10d98e);
  flex-shrink: 0;
}
.v4-secure-banner-text {
  font-size: 0.72rem;
  color: var(--text2);
  line-height: 1.5;
}
.v4-secure-banner-text strong {
  color: var(--text);
  font-weight: 700;
}

/* ══════════════════════════════════════════════════════════════════
   5. RECENTLY VIEWED
   ══════════════════════════════════════════════════════════════════ */
.v4-recently-viewed {
  margin-bottom: 16px;
}
.v4-recently-viewed-title {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 10px;
}
.v4-recently-viewed-track {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  overflow-y: hidden;
  padding-bottom: 6px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}
.v4-recently-viewed-track .pdf-card {
  flex: 0 0 140px;
  width: 140px;
  min-height: 240px;
  scroll-snap-align: start;
}
.v4-recently-viewed-track .pdf-cover {
  aspect-ratio: 3 / 4;
}
@media (max-width: 480px) {
  .v4-recently-viewed-track .pdf-card {
    flex: 0 0 120px;
    width: 120px;
  }
}

/* ══════════════════════════════════════════════════════════════════
   6. WISHLIST ANIMATION
   ══════════════════════════════════════════════════════════════════ */
@keyframes v4HeartPop {
  0% { transform: scale(1); }
  30% { transform: scale(1.35); }
  60% { transform: scale(0.9); }
  100% { transform: scale(1); }
}
.v4-wish-pop {
  animation: v4HeartPop 0.4s ease;
}

/* ══════════════════════════════════════════════════════════════════
   7. PRODUCT META BADGES ROW
   ══════════════════════════════════════════════════════════════════ */
.v4-meta-badges {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

/* ══════════════════════════════════════════════════════════════════
   8. SKELETON FOR GALLERY + CONTENT
   ══════════════════════════════════════════════════════════════════ */
.v4-gallery-skeleton {
  width: 100%;
  aspect-ratio: 3 / 4;
  max-height: 520px;
  border-radius: 20px;
  background: linear-gradient(90deg, var(--bg3), var(--glass), var(--bg3));
  background-size: 200% 100%;
  animation: v4shimmer 1.5s infinite;
  border: 1px solid var(--glass-border);
}
.v4-content-skeleton {
  height: 60px;
  border-radius: 12px;
  background: linear-gradient(90deg, var(--bg3), var(--glass), var(--bg3));
  background-size: 200% 100%;
  animation: v4shimmer 1.5s infinite;
  margin-bottom: 12px;
}

/* AMOLED enhancements for dark theme */
@media (prefers-color-scheme: dark) {
  .v4-rev-card {
    background: rgba(255,255,255,0.03);
    border-color: rgba(255,255,255,0.06);
  }
  .v4-rev-summary {
    background: rgba(255,255,255,0.02);
    border-color: rgba(255,255,255,0.06);
  }
}