.page-products {
  --gap-section: 3rem;
  --rail-width: 260px;
  font-family: var(--font-body, 'Roboto', sans-serif);
  color: var(--clr-deep-ink, #1A1A2E);
  background: var(--clr-pure-white, #FFFFFF);
  position: relative;
}

/* ===== 框景首屏 ===== */
.page-products .frame-viewport {
  position: relative;
  background: var(--clr-warm-paper, #F5F0E8);
  border: var(--border-thick, 4px) solid var(--clr-deep-ink, #1A1A2E);
  box-shadow: inset 0 0 0 2px var(--clr-subtle-shadow, rgba(0,0,0,0.15)), var(--shadow-heavy, 8px 8px 0 rgba(0,0,0,0.15));
  margin: 1rem;
  padding: 2rem 1.5rem;
  position: relative;
  overflow: hidden;
}

.page-products .breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--clr-cool-gray, #4A4A4A);
  margin-bottom: 1.5rem;
  position: relative;
  z-index: 2;
}

.page-products .breadcrumb a {
  color: var(--clr-primary-blue, #005A9E);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-default, 0.2s ease);
}

.page-products .breadcrumb a:hover,
.page-products .breadcrumb a:focus-visible {
  color: var(--clr-primary-orange, #FF6B35);
  outline: 2px solid var(--clr-primary-orange, #FF6B35);
  outline-offset: 2px;
}

.page-products .breadcrumb-sep {
  color: var(--clr-cool-gray, #4A4A4A);
}

.page-products .frame-content {
  position: relative;
  z-index: 2;
  max-width: 720px;
}

.page-products .frame-title {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-weight: var(--heading-weight, 800);
  font-style: italic;
  font-size: clamp(1.8rem, 5vw, 3rem);
  line-height: 1.1;
  color: var(--clr-deep-ink, #1A1A2E);
  margin: 0 0 0.5rem;
  text-transform: uppercase;
  letter-spacing: -0.02em;
}

.page-products .frame-subtitle {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-weight: 600;
  font-size: clamp(1rem, 2.5vw, 1.35rem);
  color: var(--clr-primary-orange, #FF6B35);
  margin: 0 0 0.75rem;
}

.page-products .frame-desc {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--clr-cool-gray, #4A4A4A);
  max-width: 540px;
  margin: 0 0 1.5rem;
}

/* 框景刻度装饰 */
.page-products .frame-marks {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
}

.page-products .frame-mark {
  position: absolute;
  width: 24px;
  height: 24px;
  border-color: var(--clr-deep-ink, #1A1A2E);
  border-style: solid;
}

.page-products .frame-mark.tl {
  top: -4px;
  left: -4px;
  border-width: 4px 0 0 4px;
}

.page-products .frame-mark.tr {
  top: -4px;
  right: -4px;
  border-width: 4px 4px 0 0;
}

.page-products .frame-mark.bl {
  bottom: -4px;
  left: -4px;
  border-width: 0 0 4px 4px;
}

.page-products .frame-mark.br {
  bottom: -4px;
  right: -4px;
  border-width: 0 4px 4px 0;
}

/* 下载按钮与二维码 */
.page-products .download-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.25rem;
}

.page-products .btn-download {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-weight: 700;
  font-size: 1.1rem;
  padding: 0.85rem 2rem;
  background: var(--clr-primary-orange, #FF6B35);
  color: var(--clr-pure-white, #FFFFFF);
  border: var(--border-thick, 4px) solid var(--clr-deep-ink, #1A1A2E);
  cursor: pointer;
  transition: background var(--transition-default, 0.2s ease), transform var(--transition-default, 0.2s ease), box-shadow var(--transition-default, 0.2s ease);
  box-shadow: 4px 4px 0 var(--clr-subtle-shadow, rgba(0,0,0,0.15));
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.page-products .btn-download:hover,
.page-products .btn-download:focus-visible {
  background: var(--clr-deep-ink, #1A1A2E);
  color: var(--clr-pure-white, #FFFFFF);
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--clr-subtle-shadow, rgba(0,0,0,0.2));
  outline: none;
}

.page-products .btn-download:active {
  transform: translate(0, 0);
  box-shadow: 2px 2px 0 var(--clr-subtle-shadow, rgba(0,0,0,0.15));
}

.page-products .qr-code {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
}

.page-products .qr-grid {
  display: grid;
  grid-template-columns: repeat(5, 10px);
  gap: 2px;
  padding: 4px;
  background: var(--clr-pure-white, #FFFFFF);
  border: 2px solid var(--clr-dark-border, #2D2D3D);
}

.page-products .qr-cell {
  width: 10px;
  height: 10px;
  background: var(--clr-deep-ink, #1A1A2E);
}

.page-products .qr-cell:nth-child(even) {
  background: var(--clr-pure-white, #FFFFFF);
}

.page-products .qr-cell:nth-child(3n) {
  background: var(--clr-deep-ink, #1A1A2E);
}

.page-products .qr-cell:nth-child(5n+2) {
  background: var(--clr-primary-orange, #FF6B35);
}

.page-products .qr-label {
  font-size: 0.75rem;
  color: var(--clr-cool-gray, #4A4A4A);
  font-weight: 500;
}

/* ===== 两列布局 ===== */
.page-products .two-column-layout {
  display: flex;
  flex-direction: column;
  gap: var(--gap-section, 3rem);
  padding: 2rem 1rem;
  max-width: 1280px;
  margin: 0 auto;
}

/* 左侧下载轨道 */
.page-products .download-rail {
  order: -1;
  width: 100%;
}

.page-products .rail-sticky {
  background: linear-gradient(135deg, var(--clr-primary-orange, #FF6B35) 0%, #e85a2a 100%);
  border: var(--border-thick, 4px) solid var(--clr-deep-ink, #1A1A2E);
  box-shadow: var(--shadow-heavy, 8px 8px 0 rgba(0,0,0,0.15));
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.75rem;
  position: relative;
}

.page-products .rail-icon {
  display: flex;
  gap: 4px;
  margin-bottom: 0.25rem;
}

.page-products .icon-dash {
  width: 20px;
  height: 4px;
  background: var(--clr-pure-white, #FFFFFF);
  transform: skew(-20deg);
}

.page-products .rail-badge {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-weight: 700;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.25rem 0.75rem;
  background: var(--clr-deep-ink, #1A1A2E);
  color: var(--clr-pure-white, #FFFFFF);
  border: 2px solid var(--clr-pure-white, #FFFFFF);
}

.page-products .rail-title {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-weight: var(--heading-weight, 800);
  font-style: italic;
  font-size: 1.5rem;
  color: var(--clr-pure-white, #FFFFFF);
  margin: 0;
  text-transform: uppercase;
  letter-spacing: -0.02em;
}

.page-products .rail-desc {
  font-size: 0.95rem;
  color: rgba(255,255,255,0.9);
  margin: 0;
  line-height: 1.4;
}

.page-products .btn-rail {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-weight: 700;
  font-size: 1rem;
  padding: 0.7rem 2rem;
  background: var(--clr-pure-white, #FFFFFF);
  color: var(--clr-deep-ink, #1A1A2E);
  border: var(--border-thick, 4px) solid var(--clr-deep-ink, #1A1A2E);
  cursor: pointer;
  transition: background var(--transition-default, 0.2s ease), transform var(--transition-default, 0.2s ease);
  box-shadow: 4px 4px 0 rgba(0,0,0,0.2);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  width: 100%;
  max-width: 220px;
}

.page-products .btn-rail:hover,
.page-products .btn-rail:focus-visible {
  background: var(--clr-deep-ink, #1A1A2E);
  color: var(--clr-pure-white, #FFFFFF);
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 rgba(0,0,0,0.25);
  outline: none;
}

.page-products .btn-rail:active {
  transform: translate(0, 0);
  box-shadow: 2px 2px 0 rgba(0,0,0,0.2);
}

.page-products .rail-qr {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  margin-top: 0.25rem;
}

.page-products .qr-sm .qr-cell {
  width: 8px;
  height: 8px;
}

.page-products .qr-sm {
  grid-template-columns: repeat(4, 8px);
  gap: 1px;
  padding: 3px;
}

/* ===== 右侧内容区 ===== */
.page-products .content-area {
  flex: 1;
  min-width: 0;
}

/* ===== 功能亮点 ===== */
.page-products .features-section {
  margin-bottom: var(--gap-section, 3rem);
  position: relative;
}

.page-products .section-heading {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-weight: var(--heading-weight, 800);
  font-style: italic;
  font-size: clamp(1.5rem, 3.5vw, 2.2rem);
  color: var(--clr-deep-ink, #1A1A2E);
  margin: 0 0 0.4rem;
  text-transform: uppercase;
  letter-spacing: -0.01em;
  position: relative;
  display: inline-block;
}

.page-products .section-heading::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 60%;
  height: var(--border-thick, 4px);
  background: var(--clr-primary-orange, #FF6B35);
  transform: skew(-20deg);
}

.page-products .section-heading-light {
  color: var(--clr-pure-white, #FFFFFF);
}

.page-products .section-heading-light::after {
  background: var(--clr-primary-orange, #FF6B35);
}

.page-products .section-intro {
  font-size: 1rem;
  color: var(--clr-cool-gray, #4A4A4A);
  margin: 0.75rem 0 2rem;
  line-height: 1.5;
  max-width: 480px;
}

.page-products .section-intro-light {
  color: rgba(255,255,255,0.8);
}

.page-products .features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.page-products .feature-card {
  background: var(--clr-pure-white, #FFFFFF);
  border: var(--border-thick, 4px) solid var(--clr-dark-border, #2D2D3D);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: transform var(--transition-default, 0.2s ease), box-shadow var(--transition-default, 0.2s ease);
  box-shadow: 4px 4px 0 var(--clr-subtle-shadow, rgba(0,0,0,0.1));
  cursor: default;
}

.page-products .feature-card:hover,
.page-products .feature-card:focus-within {
  transform: translate(-4px, -4px);
  box-shadow: 8px 8px 0 var(--clr-subtle-shadow, rgba(0,0,0,0.18));
  border-color: var(--clr-primary-orange, #FF6B35);
}

.page-products .feature-gauge {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  height: 60px;
}

.page-products .gauge-svg {
  width: 100px;
  height: 50px;
  flex-shrink: 0;
}

.page-products .gauge-value {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-weight: var(--heading-weight, 800);
  font-size: 1.2rem;
  color: var(--clr-deep-ink, #1A1A2E);
  line-height: 1;
}

.page-products .feature-title {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--clr-deep-ink, #1A1A2E);
  margin: 0;
}

.page-products .feature-desc {
  font-size: 0.9rem;
  color: var(--clr-cool-gray, #4A4A4A);
  line-height: 1.5;
  margin: 0;
}

.page-products .features-visuals {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin: 2rem 0 1.5rem;
}

.page-products .feature-figure {
  margin: 0;
  border: var(--border-thick, 4px) solid var(--clr-dark-border, #2D2D3D);
  background: var(--clr-warm-paper, #F5F0E8);
  overflow: hidden;
  box-shadow: 4px 4px 0 var(--clr-subtle-shadow, rgba(0,0,0,0.1));
}

.page-products .feature-img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  max-width: 100%;
}

.page-products .feature-figure figcaption {
  font-size: 0.8rem;
  color: var(--clr-cool-gray, #4A4A4A);
  padding: 0.5rem 0.75rem;
  background: var(--clr-warm-paper, #F5F0E8);
  border-top: 2px solid var(--clr-dark-border, #2D2D3D);
  font-style: italic;
}

.page-products .features-more {
  margin-top: 1rem;
}

.page-products .btn-outline {
  display: inline-block;
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0.65rem 1.5rem;
  background: transparent;
  color: var(--clr-primary-blue, #005A9E);
  border: var(--border-thick, 4px) solid var(--clr-primary-blue, #005A9E);
  text-decoration: none;
  transition: background var(--transition-default, 0.2s ease), color var(--transition-default, 0.2s ease), transform var(--transition-default, 0.2s ease);
  box-shadow: 3px 3px 0 var(--clr-subtle-shadow, rgba(0,0,0,0.1));
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.page-products .btn-outline:hover,
.page-products .btn-outline:focus-visible {
  background: var(--clr-primary-blue, #005A9E);
  color: var(--clr-pure-white, #FFFFFF);
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 var(--clr-subtle-shadow, rgba(0,0,0,0.18));
  outline: none;
}

/* ===== 版本信息 ===== */
.page-products .version-section {
  background: var(--clr-deep-ink, #1A1A2E);
  padding: 2rem 1.5rem;
  margin-bottom: var(--gap-section, 3rem);
  border: var(--border-thick, 4px) solid var(--clr-dark-border, #2D2D3D);
  box-shadow: var(--shadow-heavy, 8px 8px 0 rgba(0,0,0,0.15));
  position: relative;
}

.page-products .version-details {
  background: rgba(255,255,255,0.05);
  border: 2px solid rgba(255,255,255,0.15);
  margin: 1.25rem 0 1.5rem;
  padding: 0;
  transition: border-color var(--transition-default, 0.2s ease);
}

.page-products .version-details[open] {
  border-color: var(--clr-primary-orange, #FF6B35);
}

.page-products .version-summary {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  cursor: pointer;
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--clr-pure-white, #FFFFFF);
  list-style: none;
  user-select: none;
  transition: background var(--transition-default, 0.2s ease);
}

.page-products .version-summary::-webkit-details-marker {
  display: none;
}

.page-products .version-summary:hover,
.page-products .version-summary:focus-visible {
  background: rgba(255,255,255,0.08);
  outline: none;
}

.page-products .version-tag {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.2rem 0.6rem;
  background: var(--clr-primary-orange, #FF6B35);
  color: var(--clr-pure-white, #FFFFFF);
  border: 2px solid var(--clr-pure-white, #FFFFFF);
}

.page-products .version-label {
  flex: 1;
}

.page-products .version-arrow {
  width: 12px;
  height: 12px;
  border-right: 3px solid var(--clr-primary-orange, #FF6B35);
  border-bottom: 3px solid var(--clr-primary-orange, #FF6B35);
  transform: rotate(45deg);
  transition: transform var(--transition-default, 0.2s ease);
  flex-shrink: 0;
}

.page-products .version-details[open] .version-arrow {
  transform: rotate(-135deg);
}

.page-products .version-list {
  list-style: none;
  margin: 0;
  padding: 0.5rem 1.25rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.page-products .version-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.95rem;
  color: rgba(255,255,255,0.85);
  line-height: 1.5;
}

.page-products .version-icon {
  flex-shrink: 0;
  width: 10px;
  height: 10px;
  margin-top: 0.45rem;
  background: var(--clr-primary-orange, #FF6B35);
  transform: rotate(45deg);
  border: 2px solid var(--clr-pure-white, #FFFFFF);
}

.page-products .version-figure {
  margin: 1.5rem 0 0;
  border: var(--border-thick, 4px) solid rgba(255,255,255,0.2);
  overflow: hidden;
  box-shadow: 4px 4px 0 rgba(0,0,0,0.3);
}

.page-products .version-img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  max-width: 100%;
}

.page-products .version-figure figcaption {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.7);
  padding: 0.5rem 0.75rem;
  background: rgba(0,0,0,0.3);
  border-top: 2px solid rgba(255,255,255,0.15);
  font-style: italic;
}

/* ===== 使用指南 ===== */
.page-products .guide-section {
  margin-bottom: var(--gap-section, 3rem);
}

.page-products .guide-steps {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin: 1.5rem 0 2rem;
}

.page-products .guide-step {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  padding: 1.25rem;
  background: var(--clr-warm-paper, #F5F0E8);
  border: var(--border-thick, 4px) solid var(--clr-dark-border, #2D2D3D);
  box-shadow: 4px 4px 0 var(--clr-subtle-shadow, rgba(0,0,0,0.1));
  transition: transform var(--transition-default, 0.2s ease), box-shadow var(--transition-default, 0.2s ease);
}

.page-products .guide-step:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--clr-subtle-shadow, rgba(0,0,0,0.15));
}

.page-products .step-number {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-weight: var(--heading-weight, 800);
  font-style: italic;
  font-size: 2rem;
  line-height: 1;
  color: var(--clr-primary-orange, #FF6B35);
  flex-shrink: 0;
  min-width: 3rem;
}

.page-products .step-content {
  flex: 1;
  min-width: 0;
}

.page-products .step-title {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--clr-deep-ink, #1A1A2E);
  margin: 0 0 0.35rem;
}

.page-products .step-desc {
  font-size: 0.9rem;
  color: var(--clr-cool-gray, #4A4A4A);
  line-height: 1.5;
  margin: 0;
}

.page-products .guide-figure {
  margin: 2rem 0 1.5rem;
  border: var(--border-thick, 4px) solid var(--clr-dark-border, #2D2D3D);
  background: var(--clr-warm-paper, #F5F0E8);
  overflow: hidden;
  box-shadow: var(--shadow-heavy, 8px 8px 0 rgba(0,0,0,0.15));
}

.page-products .guide-img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  max-width: 100%;
}

.page-products .guide-figure figcaption {
  font-size: 0.85rem;
  color: var(--clr-cool-gray, #4A4A4A);
  padding: 0.6rem 0.75rem;
  background: var(--clr-warm-paper, #F5F0E8);
  border-top: 2px solid var(--clr-dark-border, #2D2D3D);
  font-style: italic;
}

.page-products .guide-help {
  margin-top: 1rem;
}

/* ===== 品牌纹理分隔 ===== */
.page-products .brand-divider {
  border-top: var(--border-thick, 4px) solid var(--clr-dark-border, #2D2D3D);
  overflow: hidden;
  background: var(--clr-warm-paper, #F5F0E8);
  margin: 0 1rem 1rem;
}

.page-products .divider-img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  max-width: 100%;
  opacity: 0.7;
}

/* ===== 桌面端 >= 768px ===== */
@media (min-width: 768px) {
  .page-products .frame-viewport {
    margin: 1.5rem;
    padding: 3rem 2.5rem;
  }

  .page-products .frame-content {
    max-width: 680px;
  }

  .page-products .frame-title {
    font-size: clamp(2.2rem, 4vw, 3.2rem);
  }

  .page-products .two-column-layout {
    flex-direction: row;
    align-items: flex-start;
    padding: 2rem 1.5rem;
    gap: 2rem;
  }

  .page-products .download-rail {
    order: 0;
    width: var(--rail-width, 260px);
    flex-shrink: 0;
    position: sticky;
    top: 2rem;
  }

  .page-products .rail-sticky {
    padding: 1.75rem 1.25rem;
  }

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

  .page-products .features-visuals {
    grid-template-columns: 1fr 1fr;
  }

  .page-products .guide-steps {
    gap: 1.25rem;
  }

  .page-products .brand-divider {
    margin: 0 1.5rem 1.5rem;
  }
}

/* ===== 大桌面端 >= 1024px ===== */
@media (min-width: 1024px) {
  .page-products .frame-viewport {
    margin: 2rem;
    padding: 4rem 3rem;
  }

  .page-products .two-column-layout {
    padding: 2.5rem 2rem;
    gap: 3rem;
  }

  .page-products .download-rail {
    --rail-width: 280px;
  }

  .page-products .features-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-products .features-visuals {
    grid-template-columns: 2fr 1fr;
  }

  .page-products .guide-steps {
    flex-direction: row;
    gap: 1.5rem;
  }

  .page-products .guide-step {
    flex: 1;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 1.5rem;
  }

  .page-products .step-number {
    font-size: 2.5rem;
    min-width: auto;
  }

  .page-products .brand-divider {
    margin: 0 2rem 2rem;
  }
}

/* ===== 超大桌面端 >= 1400px ===== */
@media (min-width: 1400px) {
  .page-products .two-column-layout {
    padding: 3rem 2rem;
    max-width: 1320px;
  }

  .page-products .download-rail {
    --rail-width: 300px;
  }
}