/* ============================================================
   GTCARD – Product Detail Page Styles
   File: css/product.css
   Purpose: Styles only for the product page (product.html)
   Shared site styles live in style.css
   ============================================================ */

.product-page {
  padding: 24px 0 16px;
}

.product-page__title {
  font-size: 1.65rem;
  font-weight: 800;
  color: #111;
  margin-bottom: 18px;
  letter-spacing: -0.02em;
}

/* ----------------------------------------------------------
   Product layout: image | variants | buy box
   ---------------------------------------------------------- */
.product-layout {
  display: grid;
  grid-template-columns: 280px 1fr 260px;
  gap: 20px;
  align-items: start;
  margin-bottom: 18px;
}

/* Left: media */
.product-media__img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  object-position: center;
  border-radius: 18px;
  display: block;
  background: transparent;
}

.product-buybox__thumb {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: contain;
  padding: 6px;
  flex-shrink: 0;
  background: #fff;
  border: 1px solid #ececec;
}

.product-media__badges {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 10px;
}

.product-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: #4b5563;
}

.product-badge svg {
  color: var(--green-500);
  flex-shrink: 0;
}

/* Center: variant grid */
.product-variants {
  background: #fff;
  border: 1px solid #ececec;
  border-radius: 18px;
  padding: 16px;
}

.product-variants__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.variant-card {
  background: #fff;
  border: 1.5px solid transparent;
  border-radius: 12px;
  padding: 14px 12px;
  text-align: left;
  cursor: pointer;
  transition: border-color var(--transition), box-shadow var(--transition);
  min-height: 72px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
}

.variant-card:hover {
  border-color: #c5c5c5;
}

.variant-card.is-selected {
  border-color: #111;
  box-shadow: 0 0 0 1px #111;
}

.variant-card__name {
  font-size: 0.78rem;
  font-weight: 600;
  color: #222;
  line-height: 1.3;
}

.variant-card__price {
  font-size: 0.78rem;
  color: #9ca3af;
  font-weight: 500;
}

/* Right: buy box */
.product-buybox {
  background: #fff;
  border: 1px solid #ececec;
  border-radius: 18px;
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  min-height: 100%;
}

.product-buybox__top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 18px;
}

.product-buybox__info {
  min-width: 0;
}

.product-buybox__name {
  font-size: 0.88rem;
  font-weight: 700;
  color: #111;
  line-height: 1.35;
  margin-bottom: 4px;
}

.product-buybox__sub {
  font-size: 0.78rem;
  color: #9ca3af;
}

.product-buybox__price {
  font-size: 1.85rem;
  font-weight: 800;
  color: #111;
  text-align: center;
  margin: 8px 0 22px;
}

.product-buybox__actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: auto;
}

.btn-cart {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 13px 16px;
  border-radius: 50px;
  background: var(--green-800);
  color: #fff;
  font-weight: 700;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: background var(--transition);
}

.btn-cart:hover {
  background: var(--green-700);
}

.btn-buynow {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 12px 16px;
  border-radius: 50px;
  background: #fff;
  color: #111;
  font-weight: 700;
  font-size: 0.95rem;
  border: 1.5px solid #d1d5db;
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition);
}

.btn-buynow:hover {
  border-color: var(--green-600);
  color: var(--green-700);
}

/* ----------------------------------------------------------
   How can use?
   ---------------------------------------------------------- */
.how-use {
  background: #fff;
  border: 1px solid #ececec;
  border-radius: 14px;
  padding: 18px 22px;
  margin-bottom: 0;
}

.how-use__title {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--green-800);
  margin-bottom: 8px;
}

.how-use__body {
  font-size: 0.75rem;
  line-height: 1.6;
  color: #4b5563;
}

.how-use__body p + p {
  margin-top: 8px;
}

/* Tighter gap before Best Sellers on product page */
.product-page + .best-sellers {
  padding: 28px 0 20px;
}

.product-page + .best-sellers .section-header {
  margin-bottom: 16px;
}

/* ----------------------------------------------------------
   Responsive
   ---------------------------------------------------------- */
@media (max-width: 1100px) {
  .product-layout {
    grid-template-columns: 220px 1fr 220px;
  }
}

@media (max-width: 900px) {
  .product-layout {
    grid-template-columns: 1fr 1fr;
  }

  .product-media {
    grid-column: 1 / -1;
    max-width: 320px;
  }

  .product-variants {
    grid-column: 1 / -1;
  }

  .product-buybox {
    grid-column: 1 / -1;
  }
}

@media (max-width: 640px) {
  .product-page__title {
    font-size: 1.3rem;
  }

  .product-variants__grid {
    grid-template-columns: 1fr 1fr;
  }

  .how-use {
    padding: 14px 16px;
  }
}