* {
  box-sizing: border-box;
}

:root {
  --brand-green: #005746;
  --brand-green-dark: #003f34;
  --accent-green: #8cc63f;
  --text-main: #111827;
  --text-muted: #4b5563;
  --border: #b9b9b9;
  --light-border: #e5e7eb;
  --page-bg: #ffffff;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text-main);
  background: var(--page-bg);
}

img {
  display: block;
  max-width: 100%;
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

/* Minimal Swiper structure fallback. The page still uses Swiper CDN,
   but these rules keep the layout stable if CDN CSS is loaded late. */
.swiper {
  overflow: hidden;
}

.swiper-wrapper {
  position: relative;
  display: flex;
  width: 100%;
  height: 100%;
  transition-property: transform;
}

.swiper-slide {
  flex-shrink: 0;
}

.page-container {
  width: 100%;
  max-width: 1200px;
  margin: 32px auto 60px;
  padding: 0 20px;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
  font-size: 13px;
  line-height: 1.4;
}

.breadcrumbs a {
  color: var(--text-main);
  text-decoration: none;
}

.breadcrumbs a:hover {
  color: var(--brand-green);
}

.product-detail-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 36px;
  align-items: start;
}

.product-gallery {
  display: grid;
  grid-template-columns: 82px minmax(0, 1fr);
  grid-template-areas: "thumbs main";
  gap: 14px;
  align-items: stretch;
  min-width: 0;
}

.gallery-main-wrap {
  position: relative;
  grid-area: main;
  width: 100%;
  min-width: 0;
  aspect-ratio: 1 / 1;
}

.product-main-swiper {
  width: 100%;
  height: 100%;
  border: 1px solid var(--border);
  background: #ffffff;
}

.product-main-swiper .main-slide {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 18px;
}

.product-main-swiper .main-slide img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.gallery-thumbs-wrap {
  position: relative;
  grid-area: thumbs;
  align-self: stretch;
  width: 82px;
  min-height: 0;
  overflow: hidden;
}

.gallery-thumbs-wrap::before,
.gallery-thumbs-wrap::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  z-index: 3;
  height: 76px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.gallery-thumbs-wrap::before {
  top: 0;
  background: linear-gradient(to top, rgba(255, 255, 255, 0), #ffffff 78%);
}

.gallery-thumbs-wrap::after {
  bottom: 0;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0), #ffffff 78%);
}

.gallery-thumbs-wrap.can-scroll-prev::before,
.gallery-thumbs-wrap.can-scroll-next::after {
  opacity: 1;
}

.product-thumbs-swiper {
  width: 82px;
  height: 100%;
  overflow: hidden;
}

.product-thumbs-swiper .swiper-wrapper {
  flex-direction: column;
  align-items: flex-start;
}

.product-thumbs-swiper .thumb-slide {
  width: 80px;
  height: 80px !important;
  border: 1px solid var(--border);
  background: #ffffff;
  overflow: hidden;
  opacity: 0.72;
  transition: border-color 0.2s ease, opacity 0.2s ease, transform 0.2s ease;
}

.product-thumbs-swiper .thumb-slide:hover {
  opacity: 1;
}

.product-thumbs-swiper .thumb-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.product-thumbs-swiper .swiper-slide-thumb-active,
.product-thumbs-swiper .thumb-slide.active-fallback {
  border-color: var(--accent-green);
  border-width: 2px;
  opacity: 1;
}

.thumb-nav-button {
  position: absolute;
  left: 50%;
  z-index: 6;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 0;
  border-radius: 999px;
  background: var(--brand-green);
  color: #ffffff;
  box-shadow: 0 6px 14px rgba(0, 0, 0, 0.22);
  transition: opacity 0.2s ease, background 0.22s ease, transform 0.22s ease;
}

.thumb-nav-button:hover {
  background: var(--brand-green-dark);
}

.thumb-nav-button svg {
  width: 24px;
  height: 24px;
}

.thumb-nav-prev {
  top: 10px;
  transform: translateX(-50%) rotate(180deg);
}

.thumb-nav-prev:hover {
  transform: translateX(-50%) rotate(180deg) translateY(1px);
}

.thumb-nav-next {
  bottom: 10px;
  transform: translateX(-50%);
}

.thumb-nav-next:hover {
  transform: translateX(-50%) translateY(-1px);
}

.thumb-nav-button.is-disabled {
  opacity: 0;
  pointer-events: none;
}

.zoom-button {
  position: absolute;
  right: 18px;
  bottom: 18px;
  z-index: 7;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: #ffffff;
  color: var(--brand-green);
  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.18);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.zoom-button:hover {
  transform: translateY(-1px);
  box-shadow: 0 5px 14px rgba(0, 0, 0, 0.22);
}

.zoom-button svg {
  width: 24px;
  height: 24px;
}

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

.product-summary h1 {
  margin: 2px 0 22px;
  font-size: 30px;
  line-height: 1.22;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.review-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
  font-size: 14px;
}

.stars {
  color: var(--brand-green);
  font-size: 22px;
  letter-spacing: -1px;
  line-height: 1;
}

.review-row a {
  margin-left: 8px;
  color: #000000;
  text-decoration: none;
}

.review-row a:hover {
  color: var(--brand-green);
  text-decoration: underline;
}

.product-intro {
  margin: 0 0 18px;
  font-size: 17px;
  line-height: 1.55;
}

.price-shipping-row {
  display: flex;
  align-items: center;
  gap: 18px;
  margin: 18px 0 24px;
}

.price {
  font-size: 22px;
  font-weight: 700;
}

.shipping-note {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-main);
  font-size: 15px;
  font-style: italic;
  letter-spacing: 0.02em;
}

.shipping-note svg {
  width: 28px;
  height: 28px;
  color: var(--accent-green);
}

.selected-color {
  margin: 0 0 26px;
  font-size: 18px;
  line-height: 1.35;
}

.kit-options h2,
.quantity-area h2 {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.2;
  letter-spacing: 0.06em;
}

.swatch-grid {
  display: grid;
  grid-template-columns: repeat(5, 66px);
  gap: 14px 10px;
  margin-bottom: 36px;
}

.swatch-button {
  width: 66px;
  height: 42px;
  padding: 0;
  border: 2px solid transparent;
  background: transparent;
  overflow: hidden;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.swatch-button:hover {
  transform: translateY(-1px);
  border-color: #d1d5db;
}

.swatch-button.active {
  border-color: var(--accent-green);
}

.swatch-button img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.purchase-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 188px;
  gap: 26px;
  align-items: end;
  padding-top: 26px;
  border-top: 1px solid var(--border);
}

.quantity-control {
  display: inline-flex;
  align-items: center;
  gap: 14px;
}

.quantity-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 30px;
  border: 0;
  background: transparent;
  color: var(--text-main);
  font-size: 26px;
  font-weight: 300;
  line-height: 1;
}

.quantity-input {
  width: 48px;
  height: 48px;
  border: 1px solid var(--border);
  text-align: center;
  font-size: 20px;
  color: var(--text-main);
}

.action-buttons {
  display: grid;
  gap: 10px;
}

.primary-button,
.secondary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 48px;
  padding: 12px 18px;
  border: 1px solid var(--brand-green);
  font-size: 16px;
  font-weight: 700;
  text-decoration: none;
  transition: background 0.22s ease, color 0.22s ease, border-color 0.22s ease;
}

.primary-button {
  background: var(--brand-green);
  color: #ffffff;
}

.primary-button:hover {
  background: var(--brand-green-dark);
  border-color: var(--brand-green-dark);
}

.secondary-button {
  background: #ffffff;
  color: var(--brand-green);
}

.secondary-button:hover {
  background: #eef8f5;
}

.product-extra-info {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 54px;
}

.info-card {
  padding: 22px;
  border: 1px solid var(--light-border);
  background: #fafafa;
}

.info-card h2 {
  margin: 0 0 10px;
  font-size: 18px;
}

.info-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.55;
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 999;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 28px;
  background: rgba(0, 0, 0, 0.78);
}

.lightbox.open {
  display: flex;
}

.lightbox-image {
  max-width: min(100%, 1080px);
  max-height: 86vh;
  background: #ffffff;
  object-fit: contain;
}

.lightbox-close {
  position: absolute;
  top: 22px;
  right: 24px;
  width: 42px;
  height: 42px;
  border: 0;
  border-radius: 50%;
  background: #ffffff;
  color: #111827;
  font-size: 28px;
  line-height: 1;
}

@media (max-width: 1100px) {
  .product-detail-layout {
    gap: 28px;
  }

  .product-gallery {
    grid-template-columns: 76px minmax(0, 1fr);
    gap: 12px;
  }

  .gallery-thumbs-wrap,
  .product-thumbs-swiper {
    width: 76px;
  }

  .product-thumbs-swiper .thumb-slide {
    width: 74px;
    height: 74px !important;
  }

  .product-summary h1 {
    font-size: 27px;
  }

  .product-intro {
    font-size: 16px;
  }

  .swatch-grid {
    grid-template-columns: repeat(4, 66px);
  }
}

@media (max-width: 900px) {
  .page-container {
    margin-top: 24px;
  }

  .product-detail-layout {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .product-gallery {
    grid-template-columns: 1fr;
    grid-template-areas:
      "main"
      "thumbs";
  }

  .gallery-main-wrap {
    max-width: 760px;
    margin: 0 auto;
  }

  .gallery-thumbs-wrap {
    width: 100%;
    height: 86px;
  }

  .gallery-thumbs-wrap::before,
  .gallery-thumbs-wrap::after {
    top: 0;
    bottom: 0;
    width: 76px;
    height: auto;
  }

  .gallery-thumbs-wrap::before {
    left: 0;
    right: auto;
    background: linear-gradient(to left, rgba(255, 255, 255, 0), #ffffff 78%);
  }

  .gallery-thumbs-wrap::after {
    left: auto;
    right: 0;
    background: linear-gradient(to right, rgba(255, 255, 255, 0), #ffffff 78%);
  }

  .product-thumbs-swiper {
    width: 100%;
    height: 86px;
  }

  .product-thumbs-swiper .swiper-wrapper {
    flex-direction: row;
    align-items: center;
  }

  .product-thumbs-swiper .thumb-slide {
    width: 76px !important;
    height: 76px !important;
  }

  .thumb-nav-prev {
    top: 50%;
    left: 10px;
    transform: translateY(-50%) rotate(90deg);
  }

  .thumb-nav-prev:hover {
    transform: translateY(-50%) rotate(90deg) translateY(1px);
  }

  .thumb-nav-next {
    top: 50%;
    right: 10px;
    bottom: auto;
    left: auto;
    transform: translateY(-50%) rotate(-90deg);
  }

  .thumb-nav-next:hover {
    transform: translateY(-50%) rotate(-90deg) translateY(-1px);
  }

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

@media (max-width: 640px) {
  .page-container {
    padding: 0 14px;
  }

  .breadcrumbs {
    font-size: 12px;
  }

  .product-main-swiper .main-slide {
    padding: 12px;
  }

  .product-summary h1 {
    font-size: 24px;
    margin-bottom: 16px;
  }

  .review-row {
    gap: 6px;
  }

  .product-intro {
    font-size: 15px;
  }

  .price-shipping-row {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }

  .selected-color {
    font-size: 16px;
  }

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

  .swatch-button {
    width: 100%;
    height: 48px;
  }

  .purchase-panel {
    grid-template-columns: 1fr;
    gap: 22px;
  }

  .action-buttons {
    grid-template-columns: 1fr;
  }

  .zoom-button {
    width: 42px;
    height: 42px;
    right: 12px;
    bottom: 12px;
  }
}