/* =========================================================
   区块层 · 产品 / 定制 / 工厂 / 关于 / 证书 / 展会 / 联系
   ========================================================= */

/* ---------- 信任条 ---------- */
.trust-bar {
  background: var(--c-ink);
  color: rgba(255, 255, 255, 0.7);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-block: 1.1rem;
  overflow: hidden;
}

.trust-bar__track {
  display: flex;
  gap: clamp(1.5rem, 4vw, 3.5rem);
  align-items: center;
  animation: marquee 32s linear infinite;
  width: max-content;
}

.trust-bar__item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--fs-tiny);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  white-space: nowrap;
}

.trust-bar__item::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--c-gold);
}

@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* ---------- 核心优势 ---------- */
.advantages {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  overflow: hidden;
}

.advantage {
  background: #fff;
  padding: clamp(1.5rem, 3vw, 2.25rem);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  transition: background var(--dur) var(--ease);
}

.advantage:hover {
  background: var(--c-cream-2);
}

.advantage__index {
  font-family: var(--font-mono);
  font-size: var(--fs-tiny);
  color: var(--c-gold-deep);
  letter-spacing: 0.16em;
}

.advantage h3 {
  font-family: var(--font-display);
  font-size: 1.22rem;
  font-weight: 600;
}

.advantage p {
  color: var(--fg-soft);
  font-size: var(--fs-small);
}

/* ---------- 产品中心 ---------- */
.products-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.products-search {
  position: relative;
  flex: 1 1 280px;
  max-width: 420px;
}

.products-search input {
  width: 100%;
  padding: 0.7rem 1rem 0.7rem 2.6rem;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: #fff;
  font-size: var(--fs-small);
  transition: border-color var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}

.products-search input:focus {
  outline: none;
  border-color: var(--c-gold);
  box-shadow: 0 0 0 3px rgba(201, 169, 106, 0.16);
}

.products-search__icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--c-text-faint);
  font-style: normal;
}

.products-count {
  font-size: var(--fs-small);
  color: var(--fg-soft);
  margin-inline-start: auto;
}

.products-count b {
  color: var(--c-text);
}

.category-scroll {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
  margin-bottom: 1.75rem;
  scrollbar-width: thin;
  scroll-snap-type: x proximity;
  /* iOS / 微信惯性滑动 */
  -webkit-overflow-scrolling: touch;
}

.category-scroll::-webkit-scrollbar {
  height: 4px;
}

.category-scroll::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

.category-scroll .chip {
  flex: 0 0 auto;
  scroll-snap-align: start;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: clamp(0.75rem, 1.6vw, 1.35rem);
}

.product-card {
  position: relative;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  overflow: hidden;
  cursor: pointer;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.product-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--sh-md);
}

.product-card__media {
  position: relative;
  aspect-ratio: 1 / 1;
  background: var(--c-cream-2);
  overflow: hidden;
}

.product-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--dur-slow) var(--ease), opacity var(--dur) var(--ease);
}

.product-card:hover .product-card__media img {
  transform: scale(1.06);
}

.product-card__media img[data-loaded="false"] {
  opacity: 0;
}

/* 图片未到位前的微光占位：弱网下也不出现大片空白 */
.product-card__media.is-pending {
  background: linear-gradient(90deg, var(--c-cream-2) 25%, #efece5 37%, var(--c-cream-2) 63%);
  background-size: 400% 100%;
  animation: shimmer 1.6s ease-in-out infinite;
}

/* 切换品类 / 全量搜索时的加载提示 */
.products-loading {
  grid-column: 1 / -1;
  padding: 2.5rem 0;
  text-align: center;
  color: var(--c-text-soft);
  font-size: 0.95rem;
}

.product-card__tag {
  position: absolute;
  top: 0.6rem;
  left: 0.6rem;
  padding: 0.2rem 0.6rem;
  border-radius: var(--r-pill);
  background: rgba(11, 12, 14, 0.78);
  color: #fff;
  font-size: 0.68rem;
  letter-spacing: 0.06em;
}

.product-card__body {
  padding: 0.75rem 0.85rem 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.product-card__name {
  font-size: var(--fs-small);
  font-weight: 500;
  line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 2.55em;
}

.product-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  font-size: 0.7rem;
  color: var(--fg-soft);
}

.product-card__meta span {
  padding: 0.1rem 0.45rem;
  border-radius: var(--r-xs);
  background: var(--c-cream-2);
}

.product-card__sku {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  color: var(--c-text-faint);
  letter-spacing: 0.06em;
}

.products-empty {
  padding: 4rem 0;
  text-align: center;
  color: var(--fg-soft);
}

.products-more {
  display: flex;
  justify-content: center;
  margin-top: 2.25rem;
}

.skeleton {
  background: linear-gradient(90deg, var(--c-cream-2) 25%, #efece5 37%, var(--c-cream-2) 63%);
  background-size: 400% 100%;
  animation: shimmer 1.3s ease-in-out infinite;
  border-radius: var(--r-md);
  aspect-ratio: 1 / 1;
}

@keyframes shimmer {
  0% { background-position: 100% 50%; }
  100% { background-position: 0 50%; }
}

/* ---------- 定制服务 ---------- */
.custom-layout {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}

.custom-steps {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin-top: 1.75rem;
}

.custom-step {
  display: grid;
  grid-template-columns: 2.2rem 1fr;
  gap: 1rem;
  padding: 1rem 0;
  border-top: 1px solid var(--border);
}

.custom-step:first-child {
  border-top: 0;
}

.custom-step__no {
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--c-gold);
  line-height: 1;
}

.custom-step h3 {
  font-size: var(--fs-h3);
  font-weight: 600;
  margin-bottom: 0.2rem;
}

.custom-step p {
  color: var(--fg-soft);
  font-size: var(--fs-small);
}

.custom-visual {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.85rem;
}

.custom-visual img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  border-radius: var(--r-md);
}

.custom-visual img:nth-child(2) {
  margin-top: 1.75rem;
}

/* ---------- 工厂实力 ---------- */
.gallery {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-auto-rows: 190px;
  gap: 0.85rem;
}

.gallery__item {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-md);
  background: var(--c-cream-2);
}

.gallery__item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--dur-slow) var(--ease);
}

.gallery__item:hover img {
  transform: scale(1.07);
}

.gallery__item--wide {
  grid-column: span 2;
  grid-row: span 2;
}

.gallery__item figcaption {
  position: absolute;
  top: auto;
  right: 0;
  bottom: 0;
  left: 0;
  padding: 1.75rem 1rem 0.75rem;
  background: linear-gradient(180deg, transparent, rgba(11, 12, 14, 0.78));
  color: #fff;
  font-size: var(--fs-tiny);
  letter-spacing: 0.08em;
}

/* ---------- 工厂实景视频 ---------- */
.factory-video {
  margin: 0 0 1.75rem;
}

/* 16:9 采用经典 padding-top 撑高法，不用 aspect-ratio：
   长尾内核（旧 X5 / 旧 Android WebView）对 aspect-ratio 支持缺失时不会塔成 0 高。 */
.factory-video__frame {
  position: relative;
  height: 0;
  padding-top: 56.25%;
  overflow: hidden;
  border-radius: var(--r-lg);
  background: #0b0c0e;
}

.factory-video__el {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #000;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

.factory-video__caption {
  margin-top: 0.6rem;
  color: var(--fg-soft);
  font-size: var(--fs-tiny);
  letter-spacing: 0.08em;
  text-align: center;
}

/* ---------- 关于 ---------- */
.about-layout {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}

.about-body p + p {
  margin-top: 1rem;
}

.about-body p {
  color: var(--fg-soft);
}

.about-figures {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.85rem;
}

.about-figure {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: clamp(1.1rem, 2vw, 1.75rem);
  text-align: center;
}

.about-figure b {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 2.6vw, 2.3rem);
  color: var(--c-gold-deep);
  line-height: 1.1;
}

.about-figure span {
  font-size: var(--fs-tiny);
  color: var(--fg-soft);
  letter-spacing: 0.06em;
}

.about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 1.5rem;
}

/* ---------- 证书 ---------- */
.cert-viewer {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.82fr);
  gap: clamp(1.5rem, 3vw, 2.5rem);
  align-items: center;
}

.cert-figure {
  display: grid;
  justify-items: center;
  gap: 0.9rem;
  min-width: 0;
}

/*
 * 画框：证书为 A4 竖版（566:800），
 * 大图以绝对定位堆叠在框内，仅 .is-active 可见，
 * 避免多图在 grid 中各自成行而把容器撑高。
 */
.cert-stage {
  position: relative;
  width: 100%;
  max-width: calc(clamp(320px, 52vh, 560px) * 0.7075);
  aspect-ratio: 566 / 800;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  box-shadow: var(--sh-sm);
  overflow: hidden;
}

.cert-stage::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: linear-gradient(160deg, rgba(201, 169, 106, 0.07), transparent 46%);
  pointer-events: none;
}

/*
 * 100% + padding + object-fit: contain —— 尺寸与图片固有比例完全解耦，
 * 未加载完成的图片同样占据正确的框，不会出现裁切。
 */
.cert-stage img {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  padding: clamp(0.75rem, 1.6vw, 1.4rem);
  object-fit: contain;
  opacity: 0;
  visibility: hidden;
  transform: scale(0.985);
  cursor: zoom-in;
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease),
    visibility var(--dur) var(--ease);
}

.cert-stage img.is-active {
  opacity: 1;
  visibility: visible;
  transform: scale(1);
}

.cert-nav {
  position: absolute;
  top: 50%;
  z-index: 2;
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: var(--c-text-soft);
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--border);
  box-shadow: var(--sh-sm);
  transform: translateY(-50%);
  transition: color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease),
    border-color var(--dur-fast) var(--ease), opacity var(--dur-fast) var(--ease);
}

.cert-nav:hover {
  color: #fff;
  background: var(--c-ink);
  border-color: var(--c-ink);
}

.cert-nav--prev {
  inset-inline-start: 0.6rem;
  rotate: 90deg;
}

.cert-nav--next {
  inset-inline-end: 0.6rem;
  rotate: -90deg;
}

[dir="rtl"] .cert-nav--prev {
  rotate: -90deg;
}

[dir="rtl"] .cert-nav--next {
  rotate: 90deg;
}

.cert-caption {
  display: flex;
  align-items: baseline;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem 0.75rem;
  text-align: center;
  font-size: var(--fs-small);
}

.cert-caption__title {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--c-text);
}

.cert-caption__count {
  font-family: var(--font-mono);
  font-size: var(--fs-tiny);
  letter-spacing: 0.08em;
  color: var(--c-gold-deep);
}

.cert-hint {
  font-size: var(--fs-tiny);
  color: var(--c-text-faint);
  letter-spacing: 0.02em;
}

.cert-hint::before {
  content: "＋ ";
  color: var(--c-gold);
}

.cert-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-height: clamp(320px, 52vh, 560px);
  overflow-y: auto;
  padding-inline-end: 0.35rem;
  scrollbar-width: thin;
}

.cert-list button {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  background: #fff;
  text-align: start;
  font-size: var(--fs-small);
  color: var(--c-text-soft);
  transition: border-color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease),
    color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
}

.cert-list button:hover {
  border-color: var(--c-gold);
  background: rgba(201, 169, 106, 0.08);
  transform: translateX(2px);
}

.cert-list button.is-active {
  border-color: var(--c-gold);
  background: rgba(201, 169, 106, 0.14);
  color: var(--c-text);
  font-weight: 500;
}

.cert-list img {
  width: 52px;
  height: 52px;
  object-fit: cover;
  object-position: top center;
  border-radius: var(--r-xs);
  border: 1px solid var(--border);
  flex-shrink: 0;
  background: #fff;
  transition: border-color var(--dur-fast) var(--ease);
}

.cert-list button.is-active img {
  border-color: var(--c-gold);
}

/* ---------- 证书放大 ---------- */
.cert-zoom {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: calc(var(--z-modal) + 5);
  display: grid;
  place-items: center;
  padding: clamp(1rem, 4vh, 3rem);
  background: rgba(6, 7, 9, 0.92);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur) var(--ease), visibility var(--dur) var(--ease);
}

.cert-zoom.is-open {
  opacity: 1;
  visibility: visible;
}

.cert-zoom__figure {
  margin: 0;
  display: grid;
  justify-items: center;
  gap: 0.9rem;
  max-width: min(760px, 88vw);
}

.cert-zoom__figure img {
  max-width: 100%;
  max-height: 78vh;
  object-fit: contain;
  padding: 0.6rem;
  background: #fff;
  border-radius: var(--r-md);
  box-shadow: var(--sh-lg);
  transform: scale(0.96);
  transition: transform var(--dur) var(--ease);
}

.cert-zoom.is-open .cert-zoom__figure img {
  transform: scale(1);
}

.cert-zoom__figure figcaption {
  color: rgba(255, 255, 255, 0.75);
  font-size: var(--fs-small);
  letter-spacing: 0.04em;
  text-align: center;
}

.cert-zoom__close,
.cert-zoom__nav {
  position: absolute;
  z-index: 2;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: #fff;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.22);
  transition: background var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}

.cert-zoom__close:hover,
.cert-zoom__nav:hover {
  background: var(--c-gold);
  border-color: var(--c-gold);
  color: var(--c-ink);
}

.cert-zoom__close {
  top: max(1rem, 2.5vh);
  inset-inline-end: max(1rem, 2.5vw);
  width: 42px;
  height: 42px;
}

.cert-zoom__nav {
  top: 50%;
  width: 46px;
  height: 46px;
  transform: translateY(-50%);
}

.cert-zoom__nav--prev {
  inset-inline-start: max(0.75rem, 2vw);
  rotate: 90deg;
}

.cert-zoom__nav--next {
  inset-inline-end: max(0.75rem, 2vw);
  rotate: -90deg;
}

[dir="rtl"] .cert-zoom__nav--prev {
  rotate: -90deg;
}

[dir="rtl"] .cert-zoom__nav--next {
  rotate: 90deg;
}

/* ---------- 展会 ---------- */
.exhibition-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 0.85rem;
}

.exhibition-grid figure {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-md);
  aspect-ratio: 3 / 2;
  background: var(--c-cream-2);
}

.exhibition-grid img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--dur-slow) var(--ease);
}

.exhibition-grid figure:hover img {
  transform: scale(1.06);
}

.exhibition-grid figcaption {
  position: absolute;
  top: auto;
  right: 0;
  bottom: 0;
  left: 0;
  padding: 1.5rem 0.85rem 0.7rem;
  background: linear-gradient(180deg, transparent, rgba(11, 12, 14, 0.72));
  color: #fff;
  font-size: var(--fs-tiny);
  letter-spacing: 0.08em;
}

/* ---------- 联系 ---------- */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 0.85fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: start;
}

.contact-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: clamp(1.5rem, 3vw, 2.5rem);
  box-shadow: var(--sh-sm);
}

.contact-card h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  margin-bottom: 1.25rem;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 1.35rem;
}

.contact-info__item {
  display: flex;
  gap: 0.85rem;
}

.contact-info__icon {
  width: 42px;
  height: 42px;
  flex-shrink: 0;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: rgba(201, 169, 106, 0.16);
  color: var(--c-gold-deep);
}

.contact-info h4 {
  font-size: var(--fs-small);
  margin-bottom: 0.2rem;
}

.contact-info p,
.contact-info a {
  font-size: var(--fs-small);
  color: var(--fg-soft);
}

.contact-map {
  margin-top: 1.5rem;
  position: relative;
  border-radius: var(--r-md);
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background: var(--c-cream-2);
}

.contact-map img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.contact-map__pin {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  display: grid;
  place-items: center;
  background: rgba(11, 12, 14, 0.24);
  color: #fff;
  font-size: 2rem;
}

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .advantages {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .custom-layout,
  .about-layout,
  .cert-viewer,
  .contact-layout {
    grid-template-columns: 1fr;
  }
  .gallery {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 720px) {
  .advantages {
    grid-template-columns: 1fr;
  }
  .product-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  }
  .gallery {
    grid-template-columns: repeat(2, 1fr);
    grid-auto-rows: 140px;
  }
  /* 两张并排更耐看：单列会让两张竖图占据整屏 */
  .custom-visual {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.6rem;
  }
  .custom-visual img {
    aspect-ratio: 1 / 1;
  }
  .custom-visual img:nth-child(2) {
    margin-top: 0;
  }
  .contact-map {
    aspect-ratio: 4 / 3;
  }
  .products-toolbar {
    gap: 0.6rem;
  }
  .products-search {
    flex: 1 1 100%;
    max-width: none;
  }
  .products-count {
    margin-inline-start: 0;
  }
}

/* 小屏手机（iPhone SE / 安卓主流 360–400px）：两列卡片 + 更紧凑间距 */
@media (max-width: 520px) {
  .product-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.55rem;
  }
  .product-card__body {
    padding: 0.6rem 0.7rem 0.75rem;
  }
  .product-card__name {
    font-size: 0.82rem;
    min-height: 2.4em;
  }
  .product-card__tag {
    font-size: 0.64rem;
    padding: 0.16rem 0.5rem;
  }
  .gallery {
    grid-auto-rows: 118px;
    gap: 0.6rem;
  }
  .gallery__item figcaption {
    padding: 1.25rem 0.7rem 0.6rem;
  }
  .cert-list button {
    min-width: 124px;
  }
  .cert-list img {
    height: 96px;
  }
  .advantage h3 {
    font-size: 1.1rem;
  }
  .custom-step {
    grid-template-columns: 1.9rem 1fr;
    gap: 0.75rem;
  }
  .contact-card {
    padding: 1.25rem;
  }
}

/* 触屏设备：去掉依赖指针的悬停位移，避免点按后残留 */
@media (hover: none) {
  .product-card:hover .product-card__media img,
  .gallery__item:hover img,
  .exhibition-grid figure:hover img {
    transform: none;
  }
  .cert-list button:hover {
    transform: none;
  }
}

@media (max-width: 1080px) {
  /* 单列后缩略图改为横向可滑动条，避免竖向列表过长 */
  .cert-list {
    flex-direction: row;
    max-height: none;
    overflow-x: auto;
    overflow-y: hidden;
    padding-inline-end: 0;
    padding-block-end: 0.35rem;
    scroll-snap-type: x proximity;
  }
  .cert-list button {
    flex-direction: column;
    align-items: flex-start;
    width: auto;
    min-width: 150px;
    flex: 0 0 auto;
    scroll-snap-align: start;
  }
  .cert-list button:hover {
    transform: none;
  }
  .cert-list img {
    width: 100%;
    height: 112px;
    object-fit: cover;
  }
  .cert-stage {
    margin-inline: auto;
  }
  .cert-figure {
    width: 100%;
    max-width: 420px;
    margin-inline: auto;
  }
  .cert-list {
    scroll-padding-inline: 1rem;
  }
}

/* ---------- 老内核兜底：不支持 aspect-ratio 时用 padding 撑出同款方框 ----------
 * 微信 X5 / 旧 Android WebView / iOS 14 不认识 aspect-ratio，
 * 图片容器高度会塌成 0，页面上就是一大片空白；移动端尤其明显。
 * 这里只在「确实不支持」的浏览器里生效，现代浏览器不受影响。 */
@supports not (aspect-ratio: 1 / 1) {
  .product-card__media,
  .skeleton {
    height: 0;
    padding-top: 100%;
  }
  .product-card__media img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
  }
  .cert-stage {
    height: 0;
    padding-top: 141.34%; /* 566 / 800 */
  }
  .exhibition-grid figure {
    height: 0;
    padding-top: 66.67%; /* 3 / 2 */
  }
  .exhibition-grid img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
  }
  .contact-map {
    height: 0;
    padding-top: 62.5%; /* 16 / 10 */
  }
  /* img 是替换元素，padding 技巧对它无效，给最小高度避免完全塌陷 */
  .custom-visual img {
    min-height: 12rem;
  }

  @media (max-width: 720px) {
    .custom-visual img {
      min-height: 9rem;
    }
    .contact-map {
      padding-top: 75%; /* 4 / 3 */
    }
  }
}