.page-products {
  --tree-line-color: rgba(0, 229, 255, 0.25);
  --tree-active-bg: rgba(0, 229, 255, 0.08);
  --card-border-glow: rgba(255, 215, 0, 0.15);
  --filter-bg: rgba(10, 25, 47, 0.6);
  --pdf-thumb-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
  --scrollbar-thumb: var(--color-accent-cyan);
  --scrollbar-track: rgba(0, 229, 255, 0.06);
  display: block;
  width: 100%;
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
  padding: var(--spacing-lg, 2rem) var(--spacing-md, 1rem) var(--spacing-2xl, 6rem);
  color: var(--color-text-body, #E0E0E0);
  background: transparent;
}

/* ── 面包屑 ── */
.page-products .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--spacing-xs, 0.25rem);
  font-size: var(--fs-caption, 0.75rem);
  font-weight: var(--fw-caption, 300);
  color: var(--color-text-muted, #8899AA);
  letter-spacing: 0.04em;
  margin-bottom: var(--spacing-lg, 2rem);
  text-transform: uppercase;
}
.page-products .breadcrumb-link {
  color: var(--color-accent-cyan, #00E5FF);
  text-decoration: none;
  transition: color var(--transition-fast, 0.2s ease);
}
.page-products .breadcrumb-link:hover {
  color: var(--color-accent-gold, #FFD700);
}
.page-products .breadcrumb-sep {
  margin: 0 var(--spacing-xs, 0.25rem);
  color: var(--color-divider, #2A3F5E);
}
.page-products .breadcrumb-current {
  color: var(--color-accent-gold, #FFD700);
  font-weight: var(--fw-special, 500);
}

/* ── Hero ── */
.page-products__hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl, 4rem) var(--spacing-lg, 2rem);
  margin-bottom: var(--spacing-2xl, 6rem);
  align-items: center;
}
.page-products__hero-text h1 {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-weight: var(--fw-heading, 700);
  font-size: var(--fs-heading-xl, clamp(2.75rem, 6vw, 6rem));
  line-height: 1.05;
  letter-spacing: var(--ls-heading, -0.02em);
  color: var(--color-primary-text, #FFFFFF);
  margin: 0 0 var(--spacing-md, 1rem);
}
.page-products__hero-desc {
  font-size: var(--fs-body, 1rem);
  line-height: var(--lh-body, 1.6);
  color: var(--color-text-muted, #8899AA);
  max-width: 48ch;
  margin: 0 0 var(--spacing-lg, 2rem);
}
.page-products__hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm, 0.5rem);
}
.page-products__meta-badge {
  display: inline-block;
  padding: 0.25rem 0.85rem;
  font-size: 0.7rem;
  font-weight: var(--fw-special, 500);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent-cyan, #00E5FF);
  border: 1px solid var(--color-divider, #2A3F5E);
  border-radius: 20px;
  background: rgba(0, 229, 255, 0.04);
}
.page-products__hero-visual {
  display: flex;
  justify-content: center;
}
.page-products__hero-frame {
  position: relative;
  width: 100%;
  max-width: 400px;
}
.page-products__hero-img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: var(--border-radius, 4px);
  box-shadow: var(--shadow-card, 0 2px 12px rgba(0,0,0,0.25));
}
.page-products__frame-border {
  position: absolute;
  inset: -8px;
  pointer-events: none;
  opacity: 0.6;
}
.page-products__frame-border svg {
  display: block;
  width: 100%;
  height: 100%;
}

/* ── 平板专访区 ── */
.page-products__tablet {
  margin-bottom: var(--spacing-2xl, 6rem);
  padding: var(--spacing-lg, 2rem) 0;
  border-top: 1px solid var(--color-divider, #2A3F5E);
  border-bottom: 1px solid var(--color-divider, #2A3F5E);
}
.page-products__tablet-header {
  margin-bottom: var(--spacing-lg, 2rem);
}
.page-products__tablet-header .section-title {
  margin-bottom: var(--spacing-sm, 0.5rem);
}
.page-products__tablet-desc {
  font-size: var(--fs-body, 1rem);
  color: var(--color-text-muted, #8899AA);
  margin: 0;
}
.page-products__tablet-scroll {
  display: flex;
  gap: var(--spacing-md, 1rem);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  padding-bottom: var(--spacing-sm, 0.5rem);
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}
.page-products__tablet-scroll::-webkit-scrollbar {
  height: 4px;
}
.page-products__tablet-scroll::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 4px;
}
.page-products__tablet-scroll::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
}
.page-products__tablet-card {
  flex: 0 0 85%;
  scroll-snap-align: start;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-sm, 0.5rem);
  background: rgba(10, 25, 47, 0.5);
  border: 1px solid var(--color-divider, #2A3F5E);
  border-radius: var(--border-radius, 4px);
  padding: var(--spacing-sm, 0.5rem);
  transition: border-color var(--transition-base, 0.35s ease), box-shadow var(--transition-base, 0.35s ease);
}
.page-products__tablet-card:hover {
  border-color: var(--color-accent-cyan, #00E5FF);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.08);
}
.page-products__tablet-img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: calc(var(--border-radius, 4px) - 1px);
  object-fit: cover;
}
.page-products__tablet-card-text {
  padding: var(--spacing-sm, 0.5rem) var(--spacing-xs, 0.25rem);
}
.page-products__tablet-card-title {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-weight: var(--fw-special, 500);
  font-size: var(--fs-heading-sm, 1.125rem);
  color: var(--color-primary-text, #FFFFFF);
  margin: 0 0 var(--spacing-xs, 0.25rem);
}
.page-products__tablet-card-desc {
  font-size: var(--fs-body, 1rem);
  color: var(--color-text-muted, #8899AA);
  margin: 0 0 var(--spacing-sm, 0.5rem);
  line-height: 1.5;
}
.page-products__link-arrow {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs, 0.25rem);
  font-size: var(--fs-special, 0.875rem);
  font-weight: var(--fw-special, 500);
  color: var(--color-accent-cyan, #00E5FF);
  text-decoration: none;
  transition: color var(--transition-fast, 0.2s ease), gap var(--transition-fast, 0.2s ease);
}
.page-products__link-arrow:hover {
  color: var(--color-accent-gold, #FFD700);
  gap: var(--spacing-sm, 0.5rem);
}
.page-products__tablet-cta {
  margin-top: var(--spacing-lg, 2rem);
  text-align: center;
}

/* ── 主内容区 ── */
.page-products__main {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl, 4rem);
  margin-bottom: var(--spacing-2xl, 6rem);
}

/* ── 左侧目录树 ── */
.page-products__tree {
  position: relative;
}
.page-products__tree-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: var(--spacing-md, 1rem);
  margin-bottom: var(--spacing-lg, 2rem);
}
.page-products__tree-header .section-title {
  margin: 0;
}
.page-products__tree-thumb {
  display: block;
  width: 200px;
  height: auto;
  max-width: 100%;
  border-radius: var(--border-radius, 4px);
  border: 1px solid var(--color-divider, #2A3F5E);
  opacity: 0.85;
}
.page-products__tree-list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}
.page-products__tree-item {
  position: relative;
  padding-left: 1.75rem;
  margin-bottom: 0.25rem;
}
.page-products__tree-item::before {
  content: '';
  position: absolute;
  left: 0.5rem;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--tree-line-color);
}
.page-products__tree-item:last-child::before {
  height: 1.25rem;
  bottom: auto;
}
.page-products__tree-item--l1 {
  padding-left: 0;
  margin-bottom: var(--spacing-sm, 0.5rem);
}
.page-products__tree-item--l1::before {
  display: none;
}
.page-products__tree-item--l2 {
  padding-left: 2.25rem;
}
.page-products__tree-item--l2::before {
  left: 1rem;
}
.page-products__tree-item--l3 {
  padding-left: 3.5rem;
}
.page-products__tree-item--l3::before {
  left: 2rem;
}
.page-products__tree-item--l3::after {
  content: '';
  position: absolute;
  left: 2rem;
  top: 50%;
  width: 1rem;
  height: 1px;
  background: var(--tree-line-color);
}
.page-products__tree-details {
  display: block;
}
.page-products__tree-summary {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm, 0.5rem);
  padding: 0.5rem 0.75rem;
  cursor: pointer;
  border-radius: var(--border-radius, 4px);
  transition: background var(--transition-fast, 0.2s ease), color var(--transition-fast, 0.2s ease);
  list-style: none;
  font-size: var(--fs-body, 1rem);
  color: var(--color-primary-text, #FFFFFF);
  user-select: none;
}
.page-products__tree-summary::-webkit-details-marker {
  display: none;
}
.page-products__tree-summary:hover {
  background: var(--tree-active-bg);
}
.page-products__tree-details[open] > .page-products__tree-summary {
  color: var(--color-accent-cyan, #00E5FF);
}
.page-products__tree-node-icon {
  display: inline-flex;
  width: 0.6rem;
  height: 0.6rem;
  border-right: 2px solid var(--color-accent-gold, #FFD700);
  border-bottom: 2px solid var(--color-accent-gold, #FFD700);
  transform: rotate(-45deg);
  transition: transform var(--transition-fast, 0.2s ease);
  flex-shrink: 0;
  margin-top: -0.15rem;
}
.page-products__tree-details[open] > .page-products__tree-summary .page-products__tree-node-icon {
  transform: rotate(45deg);
  margin-top: 0.1rem;
}
.page-products__tree-label {
  flex: 1;
}
.page-products__tree-count {
  font-size: var(--fs-caption, 0.75rem);
  color: var(--color-text-muted, #8899AA);
  font-weight: var(--fw-caption, 300);
  background: rgba(0, 229, 255, 0.06);
  padding: 0.1rem 0.6rem;
  border-radius: 10px;
}
.page-products__tree-children {
  list-style: none;
  margin: 0.25rem 0 0.5rem;
  padding: 0;
}
.page-products__tree-file {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm, 0.5rem);
  padding: 0.35rem 0.75rem;
  border-radius: var(--border-radius, 4px);
  text-decoration: none;
  color: var(--color-text-body, #E0E0E0);
  font-size: var(--fs-body, 1rem);
  transition: background var(--transition-fast, 0.2s ease), color var(--transition-fast, 0.2s ease);
}
.page-products__tree-file:hover {
  background: var(--tree-active-bg);
  color: var(--color-accent-gold, #FFD700);
}
.page-products__tree-file-icon {
  font-size: 1rem;
  line-height: 1;
  flex-shrink: 0;
}
.page-products__tree-footnote {
  font-size: var(--fs-caption, 0.75rem);
  color: var(--color-text-muted, #8899AA);
  margin-top: var(--spacing-lg, 2rem);
  padding-top: var(--spacing-md, 1rem);
  border-top: 1px solid var(--color-divider, #2A3F5E);
}

/* ── 右侧资源卡片 ── */
.page-products__resources {
  position: relative;
}
.page-products__resources .section-title {
  margin-bottom: var(--spacing-lg, 2rem);
}
.page-products__resource-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md, 1rem);
}
.page-products__resource-card {
  background: rgba(10, 25, 47, 0.45);
  border: 1px solid var(--color-divider, #2A3F5E);
  border-radius: var(--border-radius, 4px);
  padding: var(--spacing-lg, 2rem);
  transition: border-color var(--transition-base, 0.35s ease), box-shadow var(--transition-base, 0.35s ease), transform var(--transition-base, 0.35s ease);
  display: grid;
  grid-template-columns: 2.75rem 1fr;
  gap: var(--spacing-sm, 0.5rem) var(--spacing-md, 1rem);
  align-items: start;
}
.page-products__resource-card:hover {
  border-color: var(--color-accent-cyan, #00E5FF);
  box-shadow: 0 0 24px rgba(0, 229, 255, 0.06);
  transform: scale(1.01);
}
.page-products__resource-card-icon {
  grid-row: 1 / 3;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: var(--border-radius, 4px);
  background: rgba(0, 229, 255, 0.06);
  border: 1px solid var(--color-divider, #2A3F5E);
}
.page-products__resource-card-icon svg {
  display: block;
}
.page-products__resource-card-title {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-weight: var(--fw-heading, 700);
  font-size: var(--fs-heading-sm, 1.125rem);
  color: var(--color-primary-text, #FFFFFF);
  margin: 0;
}
.page-products__resource-card-desc {
  font-size: var(--fs-body, 1rem);
  line-height: var(--lh-body, 1.6);
  color: var(--color-text-muted, #8899AA);
  margin: 0;
}
.page-products__resource-card-foot {
  grid-column: 2;
  display: flex;
  gap: var(--spacing-sm, 0.5rem);
  margin-top: var(--spacing-xs, 0.25rem);
}
.page-products__resource-badge {
  display: inline-block;
  padding: 0.15rem 0.6rem;
  font-size: 0.65rem;
  font-weight: var(--fw-special, 500);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-radius: 10px;
  color: var(--color-accent-gold, #FFD700);
  border: 1px solid rgba(255, 215, 0, 0.3);
  background: rgba(255, 215, 0, 0.06);
}
.page-products__resource-count {
  grid-column: 2;
  font-size: var(--fs-caption, 0.75rem);
  color: var(--color-accent-cyan, #00E5FF);
  font-weight: var(--fw-special, 500);
}

/* ── 资源下载区 ── */
.page-products__downloads {
  margin-bottom: var(--spacing-2xl, 6rem);
}
.page-products__downloads-header {
  margin-bottom: var(--spacing-lg, 2rem);
}
.page-products__downloads-header .section-title {
  margin-bottom: var(--spacing-sm, 0.5rem);
}
.page-products__downloads-desc {
  font-size: var(--fs-body, 1rem);
  color: var(--color-text-muted, #8899AA);
  margin: 0;
}
.page-products__filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm, 0.5rem);
  margin-bottom: var(--spacing-lg, 2rem);
  padding: var(--spacing-sm, 0.5rem);
  background: var(--filter-bg);
  border: 1px solid var(--color-divider, #2A3F5E);
  border-radius: var(--border-radius, 4px);
}
.page-products__filter-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm, 0.5rem);
  padding: 0.4rem 1rem 0.4rem 0.6rem;
  border: 1px solid transparent;
  border-radius: var(--border-radius, 4px);
  background: transparent;
  color: var(--color-text-muted, #8899AA);
  font-family: var(--font-body, 'Inter', sans-serif);
  font-size: var(--fs-special, 0.875rem);
  font-weight: var(--fw-body, 400);
  cursor: pointer;
  transition: all var(--transition-fast, 0.2s ease);
}
.page-products__filter-btn:hover {
  color: var(--color-primary-text, #FFFFFF);
  border-color: var(--color-divider, #2A3F5E);
}
.page-products__filter-btn--active {
  color: var(--color-accent-cyan, #00E5FF);
  border-color: var(--color-accent-cyan, #00E5FF);
  background: rgba(0, 229, 255, 0.06);
}
.page-products__filter-icon {
  display: block;
  width: 24px;
  height: 24px;
  border-radius: 2px;
  object-fit: cover;
  flex-shrink: 0;
}
.page-products__pdf-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md, 1rem);
}
.page-products__pdf-item {
  display: grid;
  grid-template-columns: 80px 1fr auto;
  gap: var(--spacing-md, 1rem);
  align-items: center;
  padding: var(--spacing-sm, 0.5rem);
  background: rgba(10, 25, 47, 0.3);
  border: 1px solid var(--color-divider, #2A3F5E);
  border-radius: var(--border-radius, 4px);
  transition: border-color var(--transition-fast, 0.2s ease), box-shadow var(--transition-fast, 0.2s ease);
}
.page-products__pdf-item:hover {
  border-color: var(--color-accent-gold, #FFD700);
  box-shadow: 0 0 16px rgba(255, 215, 0, 0.04);
}
.page-products__pdf-thumb {
  display: block;
  width: 80px;
  height: auto;
  max-width: 100%;
  border-radius: 2px;
  box-shadow: var(--pdf-thumb-shadow);
  object-fit: cover;
}
.page-products__pdf-info {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  min-width: 0;
}
.page-products__pdf-title {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-weight: var(--fw-special, 500);
  font-size: var(--fs-body, 1rem);
  color: var(--color-primary-text, #FFFFFF);
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.page-products__pdf-cat {
  font-size: var(--fs-caption, 0.75rem);
  color: var(--color-text-muted, #8899AA);
}
.page-products__pdf-date {
  font-size: var(--fs-caption, 0.75rem);
  color: var(--color-divider, #2A3F5E);
}
.page-products__pdf-dl {
  flex-shrink: 0;
}

/* ── 支持卡片 ── */
.page-products__support {
  margin-top: var(--spacing-xl, 4rem);
}
.page-products__support-card {
  display: flex;
  align-items: center;
  gap: var(--spacing-md, 1rem);
  padding: var(--spacing-lg, 2rem);
  background: rgba(0, 229, 255, 0.03);
  border: 1px solid var(--color-divider, #2A3F5E);
  border-radius: var(--border-radius, 4px);
}
.page-products__support-icon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
}
.page-products__support-text {
  font-size: var(--fs-body, 1rem);
  line-height: var(--lh-body, 1.6);
  color: var(--color-text-muted, #8899AA);
}
.page-products__support-text a {
  color: var(--color-accent-cyan, #00E5FF);
  text-decoration: none;
  font-weight: var(--fw-special, 500);
  transition: color var(--transition-fast, 0.2s ease);
}
.page-products__support-text a:hover {
  color: var(--color-accent-gold, #FFD700);
}

/* ── 桌面端 ── */
@media (min-width: 768px) {
  .page-products {
    padding: var(--spacing-xl, 4rem) var(--spacing-lg, 2rem) var(--spacing-2xl, 6rem);
  }
  .page-products__hero {
    grid-template-columns: 1fr 1fr;
  }
  .page-products__hero-text h1 {
    font-size: var(--fs-heading-xl, clamp(2.75rem, 6vw, 6rem));
  }
  .page-products__tablet-card {
    flex: 0 0 45%;
  }
  .page-products__main {
    grid-template-columns: 1fr 1fr;
  }
  .page-products__resource-cards {
    grid-template-columns: 1fr;
  }
  .page-products__pdf-grid {
    grid-template-columns: 1fr 1fr;
  }
  .page-products__pdf-item {
    grid-template-columns: 72px 1fr auto;
  }
  .page-products__pdf-thumb {
    width: 72px;
  }
}

@media (min-width: 1024px) {
  .page-products__tablet-card {
    flex: 0 0 30%;
  }
  .page-products__pdf-grid {
    grid-template-columns: 1fr 1fr;
  }
  .page-products__resource-cards {
    grid-template-columns: 1fr;
  }
  .page-products__tree-item--l2 {
    padding-left: 2.75rem;
  }
  .page-products__tree-item--l3 {
    padding-left: 4.5rem;
  }
  .page-products__tree-item--l2::before {
    left: 1.25rem;
  }
  .page-products__tree-item--l3::before {
    left: 2.5rem;
  }
  .page-products__tree-item--l3::after {
    left: 2.5rem;
    width: 1.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-products *,
  .page-products *::before,
  .page-products *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
  .page-products__resource-card:hover {
    transform: none;
  }
}