.page-products {
  --waterfall-gap: var(--spacing-md);
  --index-width: 210px;
  --card-radius: 6px;
  --card-cut: 12px;
  --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  display: block;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing-lg) var(--spacing-md) var(--spacing-xl);
  background-color: var(--color-bg);
  color: var(--color-white);
  font-family: var(--font-body);
  line-height: var(--line-height-body);
}

/* 首屏区域 */
.page-products__hero {
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 2px solid var(--color-accent);
  position: relative;
}

.breadcrumb {
  font-size: var(--font-size-small);
  color: var(--color-silver);
  margin-bottom: var(--spacing-sm);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-family: var(--font-index);
}

.breadcrumb-link {
  color: var(--color-dynamic-blue);
  text-decoration: none;
  transition: color var(--transition-speed);
}

.breadcrumb-link:hover,
.breadcrumb-link:focus-visible {
  color: var(--color-accent);
  outline: var(--focus-outline);
  outline-offset: var(--focus-offset);
}

.breadcrumb-sep {
  color: var(--color-accent);
  font-weight: 700;
}

.breadcrumb-current {
  color: var(--color-warm-paper);
  font-weight: 600;
}

.page-products__title {
  font-family: var(--font-heading);
  font-size: var(--font-size-h1);
  line-height: var(--line-height-heading);
  color: var(--color-white);
  margin: var(--spacing-sm) 0 var(--spacing-xs);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.page-products__lead {
  font-size: var(--font-size-body);
  color: var(--color-silver);
  max-width: 640px;
  font-family: var(--font-index);
  border-left: 3px solid var(--color-accent);
  padding-left: var(--spacing-md);
  margin-top: var(--spacing-sm);
}

/* 主体布局：索引栏 + 瀑布流 */
.page-products__layout {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

/* 索引栏 */
.page-products__index {
  background-color: var(--color-dark-ink);
  border-radius: var(--card-radius);
  padding: var(--spacing-md);
  position: sticky;
  top: calc(var(--header-height) + var(--spacing-md));
  align-self: flex-start;
  width: 100%;
  border-left: 3px solid var(--color-accent);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
}

.page-products__index-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--color-silver);
}

.page-products__index-label {
  color: var(--color-accent);
  font-weight: 700;
  font-size: var(--font-size-index);
}

.page-products__index-title {
  font-family: var(--font-heading);
  font-size: var(--font-size-h3);
  color: var(--color-warm-paper);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.page-products__index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.page-products__index-item {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  background: transparent;
  border: 1px solid var(--color-silver);
  color: var(--color-silver);
  font-family: var(--font-index);
  font-size: var(--font-size-small);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all var(--transition-speed);
  white-space: nowrap;
}

.page-products__index-item::before {
  content: attr(data-index);
  color: var(--color-accent);
  font-weight: 700;
  margin-right: var(--spacing-xs);
}

.page-products__index-item:hover,
.page-products__index-item:focus-visible {
  border-color: var(--color-accent);
  color: var(--color-white);
  background-color: rgba(255, 107, 53, 0.12);
  outline: var(--focus-outline);
  outline-offset: var(--focus-offset);
}

.page-products__index-item.is-active {
  border-color: var(--color-accent);
  background-color: var(--color-accent);
  color: var(--color-dark-ink);
  font-weight: 700;
}

.page-products__index-item.is-active::before {
  color: var(--color-dark-ink);
}

.page-products__index-deco {
  margin-top: var(--spacing-md);
  display: flex;
  justify-content: center;
  opacity: 0.3;
}

.page-products__index-texture {
  width: 60px;
  height: auto;
  object-fit: contain;
  display: block;
}

/* 瀑布流容器 */
.page-products__waterfall {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--waterfall-gap);
  width: 100%;
}

/* 通用卡片样式 */
.page-products__card {
  background-color: var(--color-warm-paper);
  color: var(--color-dark-ink);
  border-radius: var(--card-radius);
  overflow: hidden;
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-speed), box-shadow var(--transition-speed);
  position: relative;
  clip-path: polygon(
    var(--card-cut) 0,
    100% 0,
    100% calc(100% - var(--card-cut)),
    calc(100% - var(--card-cut)) 100%,
    0 100%,
    0 var(--card-cut)
  );
}

.page-products__card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(255, 107, 53, 0.18);
}

.page-products__card-img-wrap {
  width: 100%;
  overflow: hidden;
  background-color: var(--color-primary);
  position: relative;
}

.page-products__card-img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  transition: transform var(--transition-speed);
}

.page-products__card:hover .page-products__card-img {
  transform: scale(1.03);
}

.page-products__card-img-wrap--icon {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md);
  background-color: var(--color-dark-ink);
}

.page-products__card-img-wrap--icon .page-products__card-img {
  max-width: 120px;
  height: auto;
  object-fit: contain;
}

.page-products__card-img-wrap--wide .page-products__card-img {
  max-height: 260px;
  object-fit: cover;
}

.page-products__card-body {
  padding: var(--spacing-md);
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.page-products__card-title {
  font-family: var(--font-heading);
  font-size: var(--font-size-h3);
  line-height: var(--line-height-heading);
  color: var(--color-primary);
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.page-products__card--app .page-products__card-title,
.page-products__card--desktop .page-products__card-title,
.page-products__card--flow .page-products__card-title {
  font-size: var(--font-size-h2);
}

.page-products__card-desc {
  font-size: var(--font-size-body);
  color: #2a2a2a;
  margin: 0;
  line-height: var(--line-height-body);
}

.page-products__card-features,
.page-products__card-steps {
  list-style: none;
  margin: var(--spacing-sm) 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.page-products__card-feature,
.page-products__card-step {
  font-size: var(--font-size-small);
  color: var(--color-dark-ink);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-family: var(--font-index);
}

.page-products__card-step .tag-index {
  color: var(--color-accent);
  font-weight: 700;
}

.page-products__card-steps--numbered {
  counter-reset: step-counter;
}

.page-products__btn-download {
  margin-top: auto;
  align-self: flex-start;
  font-family: var(--font-heading);
  font-size: var(--font-size-body);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: var(--spacing-xs) var(--spacing-md);
  border: none;
  border-radius: var(--border-radius);
  background-color: var(--color-accent);
  color: var(--color-white);
  cursor: pointer;
  transition: background-color var(--transition-speed), box-shadow var(--transition-speed);
  box-shadow: 0 2px 12px rgba(255, 107, 53, 0.35);
}

.page-products__btn-download:hover,
.page-products__btn-download:focus-visible {
  background-color: #e55a2b;
  box-shadow: 0 4px 20px rgba(255, 107, 53, 0.55);
  outline: var(--focus-outline);
  outline-offset: var(--focus-offset);
}

.page-products__card-hover-info {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-speed), opacity var(--transition-speed);
  opacity: 0;
  font-size: var(--font-size-small);
  color: #3a3a3a;
  border-top: 1px solid transparent;
  padding-top: 0;
  margin-top: 0;
}

.page-products__card:hover .page-products__card-hover-info,
.page-products__card:focus-within .page-products__card-hover-info {
  max-height: 120px;
  opacity: 1;
  border-top-color: var(--color-silver);
  padding-top: var(--spacing-xs);
  margin-top: var(--spacing-sm);
}

.page-products__card-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-sm);
  flex-wrap: wrap;
  font-family: var(--font-index);
  font-size: var(--font-size-small);
}

.page-products__card-link {
  color: var(--color-dynamic-blue);
  text-decoration: none;
  transition: color var(--transition-speed);
}

.page-products__card-link:hover,
.page-products__card-link:focus-visible {
  color: var(--color-accent);
  text-decoration: underline;
  outline: var(--focus-outline);
  outline-offset: var(--focus-offset);
}

.page-products__card-link-sep {
  color: var(--color-silver);
}

/* 底部提示 */
.page-products__note {
  margin-top: var(--spacing-xl);
  padding: var(--spacing-md);
  background-color: var(--color-dark-ink);
  border-radius: var(--card-radius);
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
  border-left: 3px solid var(--color-accent);
  font-size: var(--font-size-small);
  color: var(--color-silver);
  font-family: var(--font-index);
}

.page-products__note .tag-index {
  color: var(--color-accent);
  font-weight: 700;
  flex-shrink: 0;
}

.page-products__note-text {
  margin: 0;
  line-height: var(--line-height-body);
}

.page-products__note-link {
  color: var(--color-dynamic-blue);
  text-decoration: none;
}

.page-products__note-link:hover,
.page-products__note-link:focus-visible {
  color: var(--color-accent);
  text-decoration: underline;
  outline: var(--focus-outline);
  outline-offset: var(--focus-offset);
}

/* ===== Tablet 及以上 ===== */
@media (min-width: 640px) {
  .page-products {
    padding: var(--spacing-xl) var(--spacing-lg);
  }

  .page-products__layout {
    flex-direction: row;
    align-items: flex-start;
    gap: var(--spacing-lg);
  }

  .page-products__index {
    width: var(--index-width);
    flex-shrink: 0;
    position: sticky;
    top: calc(var(--header-height) + var(--spacing-md));
  }

  .page-products__index-list {
    flex-direction: column;
  }

  .page-products__index-item {
    width: 100%;
    justify-content: flex-start;
  }

  .page-products__waterfall {
    flex: 1;
    grid-template-columns: repeat(2, 1fr);
  }

  .page-products__card--app {
    grid-column: span 1;
    grid-row: span 2;
  }

  .page-products__card--desktop {
    grid-column: span 1;
  }

  .page-products__card--flow {
    grid-column: span 2;
  }

  .page-products__card-body {
    padding: var(--spacing-md) var(--spacing-lg);
  }

  .page-products__card-img-wrap--icon .page-products__card-img {
    max-width: 100px;
  }

  .page-products__card-img-wrap--wide .page-products__card-img {
    max-height: 280px;
  }
}

/* ===== 桌面端 ===== */
@media (min-width: 1024px) {
  .page-products {
    padding: var(--spacing-xl) var(--spacing-lg);
  }

  .page-products__waterfall {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-products__card--app {
    grid-column: span 1;
    grid-row: span 2;
  }

  .page-products__card--desktop {
    grid-column: span 2;
    grid-row: span 1;
  }

  .page-products__card--data {
    grid-column: span 1;
  }

  .page-products__card--flow {
    grid-column: span 3;
    flex-direction: row;
  }

  .page-products__card--flow .page-products__card-img-wrap {
    width: 45%;
    max-height: 320px;
  }

  .page-products__card--flow .page-products__card-body {
    width: 55%;
  }

  .page-products__card-img-wrap--wide .page-products__card-img {
    max-height: 320px;
  }

  .page-products__index {
    width: 220px;
  }
}

/* ===== 超大桌面 ===== */
@media (min-width: 1440px) {
  .page-products {
    padding: var(--spacing-xl) 0;
  }

  .page-products__waterfall {
    gap: var(--spacing-lg);
  }
}