/* ============================================
   HERO — O Mecanismo de Precisão
   ============================================ */

.product-hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-3xl);
  align-items: center;
  min-height: calc(100vh - 72px);
}

/* --- Visuais — Camadas de papel --- */

.product-visuals {
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-width: 0;
  position: relative;
}

.main-image {
  width: 100%;
  border-radius: var(--radius-fold);
  background-color: var(--paper-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  position: relative;
  box-shadow:
    0 1px 0 rgba(0, 0, 0, 0.06),
    0 4px 12px rgba(0, 0, 0, 0.1),
    0 0 0 var(--paper-weight) rgba(0, 0, 0, 0.08);
  cursor: zoom-in;
  isolation: isolate;
}

/* Camadas de papel atrás da imagem */
.main-image::before {
  content: "";
  position: absolute;
  inset: -4px -4px -8px 4px;
  background-color: var(--paper);
  border-radius: var(--radius-fold);
  z-index: -2;
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.04);
  transform: rotate(-0.5deg);
}

.main-image::after {
  content: "";
  position: absolute;
  inset: -8px 4px -4px -4px;
  background-color: var(--paper-layered);
  border-radius: var(--radius-fold);
  z-index: -3;
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.03);
  transform: rotate(0.8deg);
}

.main-image img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  display: block;
  position: relative;
  z-index: 1;
  transition: transform 0.5s cubic-bezier(0.33, 1, 0.68, 1), opacity var(--transition);
}

.main-image.skeleton img {
  opacity: 0;
}

/* --- Galeria — Leque de papel --- */

.image-gallery {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  scroll-behavior: smooth;
  scrollbar-width: none;
  padding: 8px 40px;
  align-items: stretch;
}

.image-gallery::-webkit-scrollbar {
  display: none;
}

.gallery-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 72px;
  position: relative;
}

.gallery-thumb {
  width: 72px;
  height: 72px;
  flex-shrink: 0;
  background-color: var(--paper-dim);
  border-radius: var(--radius-fold);
  cursor: pointer;
  border: var(--paper-weight) solid transparent;
  opacity: 0.7;
  transition: var(--transition);
  padding: 0;
  position: relative;
}

.gallery-thumb img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: contain;
  border-radius: inherit;
}

.gallery-thumb:hover,
.gallery-thumb.active {
  opacity: 1;
  border-color: var(--ink-muted);
  background-color: var(--paper);
  box-shadow: var(--paper-shadow-md);
  transform: translateY(-4px) rotate(-1deg);
}

.gallery-thumb.active {
  transform: translateY(-6px) rotate(-1.5deg);
}

.gallery-thumb:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}

.gallery-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: var(--paper);
  border: var(--paper-weight) solid var(--ink-faint);
  border-radius: var(--radius-fold);
  cursor: pointer;
  color: var(--ink-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  padding: 6px;
  z-index: 2;
  box-shadow: var(--paper-shadow);
}

.gallery-arrow-left {
  left: 0;
}

.gallery-arrow-right {
  right: 0;
}

.gallery-arrow:hover,
.gallery-arrow:focus-visible {
  background: var(--paper);
  color: var(--ink);
  border-color: var(--ink-muted);
  box-shadow: var(--paper-shadow);
  outline: none;
}

.gallery-arrow:focus-visible {
  box-shadow: 0 0 0 2px var(--crimson-glow);
}

.gallery-arrow:disabled {
  opacity: 0.25;
  cursor: not-allowed;
}

/* --- Info do Produto --- */

.product-info {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--spacing-lg) 0;
}

.product-title {
  font-family: var(--font-display);
  font-size: var(--font-size-4xl);
  font-weight: 700;
  line-height: 1.1;
  color: var(--paper);
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.product-subtitle {
  font-family: var(--font-body);
  font-size: var(--font-size-sm);
  color: var(--ink-faint);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 20px;
}

.rating {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 28px;
  padding: 10px 14px;
  background-color: rgba(244, 239, 230, 0.04);
  border-radius: var(--radius-fold);
  width: fit-content;
}

.stars {
  color: var(--ink-muted);
  letter-spacing: 2px;
  font-size: var(--font-size-sm);
}

.rating .stars[role="img"]::after {
  content: "★★★★★";
}

.reviews-count {
  color: var(--ink-faint);
  font-size: var(--font-size-xs);
  letter-spacing: 0.04em;
}

.price-container {
  display: flex;
  flex-direction: column;
  margin-bottom: 24px;
  padding: 20px;
  background-color: var(--paper);
  border-radius: var(--radius-fold);
  box-shadow: var(--paper-shadow-md);
  position: relative;
}

.price-container::before {
  content: "";
  position: absolute;
  inset: -2px -4px -6px 4px;
  background-color: var(--paper-dim);
  border-radius: var(--radius-fold);
  z-index: -1;
  transform: rotate(0.3deg);
}

.old-price {
  text-decoration: line-through;
  color: var(--ink-faint);
  font-size: var(--font-size-sm);
  text-decoration-color: var(--crimson);
}

.current-price {
  font-family: var(--font-display);
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--ink);
  line-height: 1.1;
}

.installments {
  color: var(--ink-muted);
  font-size: var(--font-size-xs);
  letter-spacing: 0.03em;
}

.description {
  color: var(--ink-muted);
  margin-bottom: var(--spacing-lg);
  font-size: var(--font-size-sm);
  line-height: 1.7;
  position: relative;
  padding-left: var(--spacing-lg);
  border-left: 2px solid var(--ink-faint);
}

/* --- Ações --- */

.actions {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
  align-items: stretch;
}

.quantity-fake {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--paper-dim);
  border: var(--paper-weight) solid var(--ink-faint);
  border-radius: var(--radius-fold);
  width: 110px;
  padding: 0 12px;
  font-weight: 600;
  font-size: var(--font-size-sm);
  color: var(--ink);
  user-select: none;
  box-shadow: var(--paper-shadow);
}

.quantity-fake button {
  cursor: pointer;
  color: var(--ink-muted);
  font-size: 18px;
  background: none;
  border: none;
  font-family: var(--font-body);
  padding: 6px;
  border-radius: var(--radius-fold);
  transition: var(--transition-fast);
  line-height: 1;
}

.quantity-fake button:hover,
.quantity-fake button:focus-visible {
  color: var(--crimson);
  outline: none;
}

.quantity-fake button:focus-visible {
  box-shadow: 0 0 0 2px var(--crimson-glow);
}

/* Botão compra — Selo carmesim */
.btn-buy {
  flex: 1;
  background-color: var(--crimson);
  color: var(--paper);
  border: none;
  border-radius: var(--radius-fold);
  font-family: var(--font-display);
  font-size: var(--font-size-base);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  transition: var(--transition);
  padding: 14px 28px;
  position: relative;
  overflow: hidden;
  box-shadow:
    0 2px 0 rgba(0, 0, 0, 0.15),
    0 4px 12px var(--crimson-glow);
}

.btn-buy::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.1) 0%,
    transparent 50%
  );
}

.btn-buy:hover,
.btn-buy:focus-visible {
  background-color: var(--crimson-hover);
  transform: translateY(-2px);
  box-shadow:
    0 4px 0 rgba(0, 0, 0, 0.1),
    0 8px 20px var(--crimson-glow);
  outline: none;
}

.btn-buy:focus-visible {
  outline: 2px solid var(--paper);
  outline-offset: 2px;
}

.btn-buy:active {
  transform: translateY(0);
  box-shadow:
    0 1px 0 rgba(0, 0, 0, 0.15),
    0 2px 6px var(--crimson-glow);
}

.btn-buy:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

/* Botão favorito */
.btn-favorite {
  background: var(--paper-dim);
  border: var(--paper-weight) solid var(--ink-faint);
  color: var(--ink-muted);
  cursor: pointer;
  padding: 0 14px;
  border-radius: var(--radius-fold);
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--paper-shadow);
}

.btn-favorite:hover,
.btn-favorite:focus-visible {
  border-color: var(--crimson);
  color: var(--crimson);
  background: var(--paper);
  outline: none;
}

.btn-favorite:focus-visible {
  box-shadow: 0 0 0 2px var(--crimson-glow);
}

.btn-favorite.ativo {
  border-color: var(--crimson);
  color: var(--crimson);
  background: var(--ink-spill);
}

.btn-favorite.ativo .material-symbols-outlined {
  font-variation-settings: "FILL" 1;
}

.subtotal {
  font-size: var(--font-size-sm);
  color: var(--ink-muted);
  margin-bottom: 12px;
  letter-spacing: 0.03em;
}

.subtotal span {
  color: var(--paper);
  font-weight: 700;
}

.shipping-info {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--ink-faint);
  font-size: var(--font-size-xs);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.shipping-info .material-symbols-outlined {
  font-size: 16px;
}

/* --- Skeleton --- */

.main-image.skeleton {
  background: linear-gradient(
    90deg,
    var(--paper-dim) 25%,
    var(--paper) 50%,
    var(--paper-dim) 75%
  );
  background-size: 200% 100%;
  animation: skeleton-shift 1.5s infinite;
}

@keyframes skeleton-shift {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* --- Sticky buy mobile --- */

.sticky-buy {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--ground);
  border-top: var(--paper-weight) solid var(--ink-faint);
  padding: 12px 16px;
  padding-bottom: max(12px, env(safe-area-inset-bottom));
  z-index: 99;
  box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.15);
}

/* --- Divisor de seção — Linha de dobra --- */

.section-divider {
  width: 40%;
  height: var(--paper-weight);
  border: none;
  background: var(--ink-faint);
  opacity: 0.3;
  margin: 0 auto var(--spacing-2xl);
  animation: divider-draw 0.8s cubic-bezier(0.33, 1, 0.68, 1) both;
}

@keyframes divider-draw {
  from {
    width: 0%;
    opacity: 0;
  }
  to {
    width: 40%;
    opacity: 0.3;
  }
}

/* --- Responsivo --- */

@media (max-width: 1024px) {
  .product-hero {
    gap: var(--spacing-xl);
  }
  .product-title {
    font-size: var(--font-size-3xl);
  }
  .current-price {
    font-size: var(--font-size-2xl);
  }
}

@media (max-width: 768px) {
  .product-hero {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-lg);
    min-height: auto;
  }
  .main-image {
    max-width: 360px;
    align-self: center;
  }
  .gallery-wrapper {
    align-self: center;
    max-width: 360px;
  }
  .product-info {
    padding: 0;
  }
}

@media (max-width: 600px) {
  .sticky-buy {
    display: block;
  }
  .product-hero {
    margin-top: var(--spacing-md);
    margin-bottom: 90px;
  }
  .product-visuals {
    gap: 12px;
  }
  .main-image {
    border-radius: var(--radius-fold);
    max-width: 300px;
  }
  .main-image::before {
    inset: -2px -2px -4px 2px;
    transform: rotate(-0.3deg);
  }
  .main-image::after {
    inset: -4px 2px -2px -2px;
    transform: rotate(0.4deg);
  }
  .image-gallery {
    flex: 1;
    min-width: 0;
    gap: 8px;
  }
  .gallery-thumb {
    width: calc((100% - 24px) / 4);
    height: auto;
    aspect-ratio: 1;
    flex-basis: calc((100% - 24px) / 4);
    border-radius: 2px;
  }
  .gallery-wrapper {
    height: 56px;
  }
  .gallery-arrow {
    padding: 4px;
  }
  .product-title {
    font-size: 26px;
    line-height: 1.15;
    margin-bottom: 4px;
  }
  .rating {
    margin-bottom: 20px;
  }
  .price-container {
    margin-bottom: 20px;
    padding: 16px;
  }
  .current-price {
    font-size: 26px;
  }
  .old-price {
    font-size: var(--font-size-xs);
  }
  .description {
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-xs);
    line-height: 1.6;
    padding-left: var(--spacing-md);
  }
  .actions {
    flex-direction: row;
    gap: 8px;
    margin-bottom: 12px;
  }
  .quantity-fake {
    width: 100px;
    height: 48px;
    border-radius: var(--radius-fold);
  }
  .btn-buy {
    padding: 14px 20px;
    font-size: var(--font-size-sm);
  }
  .btn-favorite {
    padding: 0 12px;
  }
  .subtotal {
    font-size: var(--font-size-xs);
    margin-bottom: 10px;
  }
  .shipping-info {
    font-size: 11px;
  }
  .sticky-buy .btn-buy {
    width: 100%;
    padding: 16px;
    font-size: var(--font-size-sm);
  }
  .section-divider {
    margin-bottom: var(--spacing-xl);
  }
}