/* ============================================================
   Collection Page — cs/collection.css
   Styles for mosaic/tile collection showcase pages
   ============================================================ */

/* ---------- Hero (multi-image gallery) ---------- */
.collection-hero {
  background: var(--dark);
  line-height: 0;
}

.collection-hero__grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 0;
  height: clamp(340px, 56vh, 580px);
}

.collection-hero__item {
  margin: 0;
  overflow: hidden;
  position: relative;
}

.collection-hero__item--main {
  grid-row: 1 / -1;
}

.collection-hero__item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform .6s ease;
}

.collection-hero__item:hover img {
  transform: scale(1.04);
}

/* ---------- Heading ---------- */
.collection-heading {
  background: #fff;
  border-bottom: 1px solid #e0edf8;
  padding: clamp(1.8rem, 3.5vw, 2.6rem) 0 clamp(1.4rem, 3vw, 2rem);
}

.collection-heading__inner {
  width: min(1120px, 92%);
  margin-inline: auto;
}

.collection-heading__breadcrumbs {
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  font-size: .84rem;
  color: var(--muted);
}

.collection-heading__breadcrumbs li {
  display: flex;
  align-items: center;
  gap: .4rem;
}

.collection-heading__breadcrumbs li:not(:last-child)::after {
  content: '/';
  margin-left: .4rem;
  opacity: .35;
}

.collection-heading__breadcrumbs a {
  color: var(--muted);
  transition: color var(--t-fast) ease;
}

.collection-heading__breadcrumbs a:hover {
  color: var(--primary);
}

.collection-heading__breadcrumbs li:last-child {
  color: var(--ink);
  font-weight: 600;
}

.collection-heading__badge {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .3rem .8rem;
  font-size: .76rem;
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--primary-700);
  background: var(--primary-50);
  border: 1px solid var(--primary-200);
  border-radius: 999px;
  margin-bottom: .8rem;
}

.collection-heading__title {
  font-size: clamp(1.8rem, 4.5vw, 2.8rem);
  font-weight: 800;
  color: var(--ink);
  line-height: 1.15;
  margin: 0 0 .5rem;
  letter-spacing: -.02em;
}

.collection-heading__subtitle {
  font-size: clamp(.95rem, 1.8vw, 1.12rem);
  color: var(--muted);
  max-width: 620px;
  line-height: 1.65;
  margin: 0 0 1.4rem;
}

/* ---------- Info Bar ---------- */
.collection-info-bar {
  display: flex;
  gap: 1.6rem;
  align-items: center;
  flex-wrap: wrap;
  padding-top: .2rem;
}

.collection-info-bar__item {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-size: .9rem;
  color: var(--muted);
  white-space: nowrap;
}

.collection-info-bar__item i {
  color: var(--primary);
  font-size: 1rem;
}

.collection-info-bar__item strong {
  color: var(--ink);
}

/* ---------- Section ---------- */
.collection-section {
  padding: clamp(2.5rem, 5vw, 4rem) 0;
}

.collection-section--muted {
  background: #f8fafc;
}

.collection-section--dark {
  background: var(--dark);
}

.collection-section .container {
  width: min(1120px, 92%);
  margin-inline: auto;
}

.collection-section__header {
  text-align: center;
  margin-bottom: 2rem;
}

.collection-section__header h2 {
  font-size: clamp(24px, 3.6vw, 34px);
  margin: 0 0 .4rem;
  color: var(--ink);
}

.collection-section__header p {
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 540px;
  margin: 0 auto;
}

/* ---------- Filters ---------- */
.collection-filters {
  display: flex;
  justify-content: center;
  gap: .5rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

/* FIX-R05: transition específico + FIX-R07: touch target */
.collection-filter-btn {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .55rem 1.2rem;
  min-height: 44px;
  font-size: .88rem;
  font-weight: 600;
  border: 1px solid rgba(15, 23, 42, .12);
  border-radius: 999px;
  background: #fff;
  color: var(--muted);
  cursor: pointer;
  transition: background var(--t-fast) ease, color var(--t-fast) ease, border-color var(--t-fast) ease, box-shadow var(--t-fast) ease;
}

.collection-filter-btn:hover {
  border-color: var(--primary-300);
  color: var(--primary-600);
  background: var(--primary-50);
}

.collection-filter-btn.is-active {
  background: linear-gradient(180deg, var(--primary), var(--primary-600));
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 14px rgba(14, 165, 233, .25);
}

.collection-filter-btn__count {
  font-size: .75rem;
  font-weight: 700;
  background: rgba(255, 255, 255, .2);
  padding: .1rem .45rem;
  border-radius: 999px;
}

.collection-filter-btn.is-active .collection-filter-btn__count {
  background: rgba(255, 255, 255, .25);
}

/* ---------- Mosaic Grid ---------- */
.collection-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1.5rem;
}

/* ---------- Mosaic Card ---------- */
.mosaic-card {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid rgba(15, 23, 42, .07);
  box-shadow: 0 2px 12px rgba(15, 23, 42, .06);
  transition: transform var(--t-med) ease, box-shadow var(--t-med) ease;
  display: flex;
  flex-direction: column;
}

.mosaic-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(15, 23, 42, .12);
}

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

.mosaic-card__media {
  position: relative;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  background: #f1f5f9;
}

.mosaic-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .5s ease;
}

.mosaic-card:hover .mosaic-card__media img {
  transform: scale(1.08);
}

.mosaic-card__format {
  position: absolute;
  top: .7rem;
  right: .7rem;
  padding: .25rem .6rem;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .03em;
  text-transform: uppercase;
  color: #fff;
  background: rgba(15, 23, 42, .7);
  border-radius: 6px;
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
}

.mosaic-card__body {
  padding: 1rem 1.1rem 1.2rem;
  display: flex;
  flex-direction: column;
  gap: .5rem;
  flex: 1;
}

.mosaic-card__name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ink);
  margin: 0;
  line-height: 1.3;
}

.mosaic-card__specs {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: .25rem;
  font-size: .82rem;
  color: var(--muted);
}

.mosaic-card__specs li {
  display: flex;
  align-items: center;
  gap: .35rem;
}

.mosaic-card__specs i {
  color: var(--primary);
  font-size: .72rem;
  width: 14px;
  text-align: center;
}

/* ---------- Card Actions Footer ---------- */
.mosaic-card__actions {
  margin-top: auto;
  border-top: 1px solid rgba(15, 23, 42, .06);
  display: flex;
  flex-direction: column;
}

.mosaic-card__add-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .4rem;
  padding: .55rem .6rem;
  font-size: .8rem;
  font-weight: 600;
  color: var(--primary-600);
  background: var(--primary-50);
  border: none;
  cursor: pointer;
  transition: background var(--t-fast) ease, color var(--t-fast) ease;
}

.mosaic-card__add-btn:hover {
  background: var(--primary-300);
  color: #fff;
}

.mosaic-card__add-btn.btn-add-to-cart--added {
  background: #d1fae5;
  color: #065f46;
  pointer-events: none;
}

.mosaic-card__add-btn i {
  font-size: .72rem;
}

.mosaic-card__cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .4rem;
  padding: .55rem .6rem;
  font-size: .8rem;
  font-weight: 700;
  color: #1a9e4d;
  background: rgba(37, 211, 102, .08);
  border-top: 1px solid rgba(15, 23, 42, .04);
  transition: background var(--t-fast) ease, color var(--t-fast) ease;
  text-decoration: none;
}

.mosaic-card__cta:hover {
  background: #1ebe5d;
  color: #fff;
}

/* ---------- Ambient Gallery ---------- */
.collection-ambient {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 1rem;
  min-height: 420px;
}

.collection-ambient__item {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
}

.collection-ambient__item:first-child {
  grid-row: 1 / -1;
}

.collection-ambient__item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .6s ease;
}

.collection-ambient__item:hover img {
  transform: scale(1.04);
}

.collection-ambient__caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 2.5rem 1.2rem 1rem;
  background: linear-gradient(0deg, rgba(10, 22, 40, .7) 0%, transparent 100%);
  color: #fff;
  font-size: .85rem;
  font-weight: 600;
}

/* ---------- Formats Table ---------- */
.collection-formats {
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  border-collapse: separate;
  border-spacing: 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid rgba(15, 23, 42, .08);
  box-shadow: 0 2px 12px rgba(15, 23, 42, .05);
}

.collection-formats thead th {
  background: var(--dark);
  color: #e5f4ff;
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .03em;
  text-transform: uppercase;
  padding: .8rem 1rem;
  text-align: left;
}

.collection-formats tbody td {
  padding: .75rem 1rem;
  font-size: .9rem;
  color: var(--ink);
  border-bottom: 1px solid rgba(15, 23, 42, .06);
  vertical-align: top;
}

.collection-formats tbody tr:last-child td {
  border-bottom: none;
}

.collection-formats tbody tr:hover {
  background: #f8fbff;
}

.collection-formats .format-badge {
  display: inline-block;
  padding: .18rem .55rem;
  font-size: .75rem;
  font-weight: 700;
  background: var(--primary-50);
  color: var(--primary-700);
  border-radius: 6px;
}

/* ---------- PDF Viewer ---------- */
.collection-pdf {
  max-width: 820px;
  margin: 0 auto;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid rgba(15, 23, 42, .10);
  box-shadow: 0 4px 24px rgba(15, 23, 42, .08);
  background: #fff;
}

.collection-pdf__toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .8rem;
  padding: .6rem 1rem;
  background: linear-gradient(180deg, #1e293b, #0f172a);
  color: #94a3b8;
  font-size: .84rem;
}

.collection-pdf__filename {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-weight: 600;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.collection-pdf__filename i {
  color: #ef4444;
  font-size: 1.15rem;
  flex-shrink: 0;
}

.collection-pdf__actions {
  display: flex;
  gap: .4rem;
  flex-shrink: 0;
}

/* FIX-R05: transition específico */
.collection-pdf__btn {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .35rem .75rem;
  font-size: .78rem;
  font-weight: 600;
  color: #cbd5e1;
  background: rgba(255, 255, 255, .08);
  border: 1px solid rgba(255, 255, 255, .1);
  border-radius: 6px;
  text-decoration: none;
  transition: background var(--t-fast) ease, color var(--t-fast) ease;
  white-space: nowrap;
}

.collection-pdf__btn:hover {
  background: rgba(255, 255, 255, .15);
  color: #fff;
}

.collection-pdf__btn--primary {
  background: var(--primary);
  border-color: transparent;
  color: #fff;
}

.collection-pdf__btn--primary:hover {
  background: var(--primary-600);
}

.collection-pdf__viewer {
  height: 680px;
  background: #e2e8f0;
}

.collection-pdf__viewer object {
  display: block;
  border: none;
}

.collection-pdf__fallback {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 680px;
  gap: .6rem;
  padding: 2rem;
  text-align: center;
  color: var(--muted);
}

.collection-pdf__fallback > i {
  font-size: 3.5rem;
  color: #ef4444;
  opacity: .5;
  margin-bottom: .5rem;
}

.collection-pdf__fallback p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.5;
}

/* ---------- CTA Strip ---------- */
.collection-cta {
  text-align: center;
  padding: clamp(3rem, 5vw, 4.5rem) 0;
  background: linear-gradient(160deg, #0a1628 0%, #122a45 40%, #0d1f36 100%);
  position: relative;
  overflow: hidden;
}

.collection-cta::before {
  content: "";
  position: absolute;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(14, 165, 233, .12) 0%, transparent 70%);
  top: -120px;
  right: -60px;
  pointer-events: none;
}

.collection-cta .container {
  position: relative;
  z-index: 1;
  width: min(1120px, 92%);
  margin-inline: auto;
}

.collection-cta__title {
  font-size: clamp(22px, 3.4vw, 32px);
  color: #fff;
  margin: 0 0 .5rem;
  font-weight: 800;
}

.collection-cta__text {
  color: #a0c4db;
  font-size: 1.05rem;
  margin: 0 0 1.6rem;
}

.collection-cta__actions {
  display: flex;
  gap: .8rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .collection-hero__grid {
    height: clamp(280px, 45vh, 440px);
  }

  .collection-ambient {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto;
    min-height: unset;
  }

  .collection-ambient__item:first-child {
    grid-column: 1 / -1;
    grid-row: auto;
    max-height: 320px;
  }
}

@media (max-width: 640px) {
  .collection-hero__grid {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto;
    height: auto;
    gap: 0;
  }

  .collection-hero__item--main {
    grid-column: 1 / -1;
    grid-row: auto;
    max-height: 42vh;
  }

  .collection-info-bar {
    gap: .6rem 1.2rem;
    flex-wrap: wrap;
  }

  .collection-info-bar__item {
    font-size: .82rem;
    gap: .35rem;
  }

  .collection-info-bar__item i {
    font-size: .85rem;
  }

  .collection-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: .8rem;
  }

  .mosaic-card__media {
    display: flex;
    flex-direction: column;
    aspect-ratio: unset;
  }

  .mosaic-card__media img {
    aspect-ratio: 1 / 1;
    width: 100%;
    object-fit: cover;
  }

  .mosaic-card__format {
    position: static;
    display: block;
    text-align: center;
    border-radius: 0 0 var(--radius) var(--radius);
    padding: .4rem .6rem;
    font-size: .72rem;
  }

  .mosaic-card__body {
    padding: .75rem .8rem .9rem;
  }

  .mosaic-card__name {
    font-size: .92rem;
  }

  .mosaic-card__specs {
    font-size: .76rem;
  }

  .collection-ambient {
    grid-template-columns: 1fr;
    gap: .7rem;
  }

  .collection-ambient__item:first-child {
    grid-column: auto;
    max-height: 240px;
  }

  .collection-formats,
  .collection-formats thead,
  .collection-formats tbody,
  .collection-formats tr,
  .collection-formats th,
  .collection-formats td {
    display: block;
    width: 100%;
  }

  .collection-formats {
    font-size: .88rem;
    max-width: 100%;
  }

  .collection-formats thead {
    display: none;
  }

  .collection-formats tbody td {
    padding: .7rem 1rem;
    text-align: left;
    border-bottom: 1px solid rgba(15, 23, 42, .06);
  }

  .collection-formats tbody td:last-child {
    border-bottom: none;
  }

  .collection-formats tbody td::before {
    content: attr(data-label);
    display: block;
    font-weight: 700;
    font-size: .75rem;
    text-transform: uppercase;
    letter-spacing: .03em;
    color: var(--primary-700);
    margin-bottom: .25rem;
  }

  .collection-formats tbody tr + tr td:first-child {
    border-top: 2px solid var(--primary-200);
    padding-top: 1rem;
  }

  .collection-pdf__toolbar {
    flex-direction: column;
    align-items: stretch;
    gap: .5rem;
    padding: .7rem .8rem;
  }

  .collection-pdf__filename {
    font-size: .78rem;
    justify-content: center;
  }

  .collection-pdf__actions {
    justify-content: center;
  }

  .collection-pdf__viewer {
    display: none;
  }
}

/* ---------- Very narrow mobile ---------- */
@media (max-width: 480px) {
  .collection-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
}