.page-products {
  --pad-block: clamp(34px, 6vw, 68px);
  --tier-accent: var(--c-neon);
  --stock-accent: var(--c-neon);
}

/* ---------- 顶部上下文区 ---------- */

.page-products .prod-top {
  padding-block: clamp(24px, 4vw, 40px) clamp(30px, 5vw, 52px);
  border-bottom: 1px solid var(--line);
}

.page-products .prod-top__grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  margin-top: clamp(20px, 3.5vw, 34px);
}

.page-products .prod-top__lead h1 {
  margin: 12px 0 0;
  font-size: clamp(30px, 6.2vw, 44px);
  line-height: 1.16;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--c-mineral);
}

.page-products .prod-top__desc {
  margin: 18px 0 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-cool);
}

.page-products .prod-top__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-products .prod-top__facts > div {
  background: var(--c-void);
  padding: 15px 16px 17px;
}

.page-products .prod-top__facts dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--c-cool);
}

.page-products .prod-top__facts dd {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.5;
  color: var(--c-mineral);
}

.page-products .prod-top__facts .num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  color: var(--c-hot);
  text-shadow: 0 0 12px rgba(255, 122, 26, 0.35);
  margin-right: 0.15em;
  vertical-align: -2px;
}

/* ---------- 章节骨架 ---------- */

.page-products .chapter {
  padding-block: var(--pad-block);
  border-bottom: 1px solid var(--line);
}

.page-products .chapter-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px 16px;
  align-items: start;
  margin-bottom: clamp(20px, 3.5vw, 34px);
}

.page-products .chapter-head .sec-num {
  line-height: 1.1;
}

.page-products .chapter-head h2 {
  margin: 0 0 10px;
  font-size: clamp(22px, 4.2vw, 30px);
  line-height: 1.25;
  font-weight: 800;
  letter-spacing: -0.015em;
  color: var(--c-mineral);
}

.page-products .chapter-head p {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-cool);
}

/* ---------- 图片容器 ---------- */

.page-products .media-frame {
  margin: 0 0 clamp(18px, 3vw, 28px);
}

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

.page-products .time-path {
  margin-top: clamp(18px, 3vw, 28px);
  margin-bottom: 0;
}

/* ---------- 01 档位轨道 ---------- */

.page-products .tier-rail {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 84%;
  gap: 12px;
  margin-top: 18px;
  padding: 2px 2px 16px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--line-strong) transparent;
}

.page-products .tier-rail:focus-visible {
  outline: 2px solid var(--c-neon);
  outline-offset: 4px;
}

.page-products .tier-rail::-webkit-scrollbar {
  height: 4px;
}

.page-products .tier-rail::-webkit-scrollbar-thumb {
  background: var(--line-strong);
}

.page-products .tier-card {
  position: relative;
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 22px 18px 24px;
  border: 1px solid var(--line);
  background: var(--c-panel);
  transition: opacity 160ms var(--ease), border-color 160ms var(--ease);
}

.page-products .tier-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--tier-accent);
}

.page-products .tier-card:nth-child(1) { --tier-accent: var(--c-neon); }
.page-products .tier-card:nth-child(2) { --tier-accent: var(--c-halo); }
.page-products .tier-card:nth-child(3) { --tier-accent: var(--c-book); }
.page-products .tier-card:nth-child(4) { --tier-accent: var(--c-hot); }
.page-products .tier-card:nth-child(5) { --tier-accent: var(--c-clay); }

.page-products .tier-rail:hover .tier-card,
.page-products .tier-rail:focus-within .tier-card {
  opacity: 0.58;
}

.page-products .tier-rail:hover .tier-card:hover,
.page-products .tier-rail:focus-within .tier-card:focus-within {
  opacity: 1;
  border-color: var(--line-neon);
}

.page-products .tier-card__idx {
  margin: 2px 0 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--tier-accent);
}

.page-products .tier-card h3 {
  margin: 0;
  font-size: 21px;
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: -0.012em;
  color: var(--c-mineral);
}

.page-products .tier-card__pos {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--c-mineral);
}

.page-products .tier-card__label {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--c-cool);
}

.page-products .tier-card__use {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-cool);
}

.page-products .tier-card__diff {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.page-products .tier-card__diff li {
  position: relative;
  padding-left: 15px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--c-mineral);
}

.page-products .tier-card__diff li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 7px;
  height: 1px;
  background: var(--tier-accent);
}

.page-products .rail-hint {
  margin: 2px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--c-cool);
}

/* ---------- 02 库存双标签 ---------- */

.page-products .stock-layout {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
}

.page-products .stock-layout .media-frame {
  margin-bottom: 0;
}

.page-products .stock-stack {
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-products .stock-card {
  display: grid;
  gap: 11px;
  align-content: start;
  padding: 20px 20px 22px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--stock-accent);
  background: var(--c-panel);
  transition: border-color 160ms var(--ease), background 160ms var(--ease);
}

.page-products .stock-card--live { --stock-accent: var(--c-neon); }
.page-products .stock-card--book { --stock-accent: var(--c-book); }

.page-products .stock-card:hover,
.page-products .stock-card:focus-within {
  border-color: var(--line-strong);
  border-left-color: var(--stock-accent);
  background: var(--c-moss);
}

.page-products .stock-card .tag {
  justify-self: start;
}

.page-products .stock-card h3 {
  margin: 2px 0 0;
  font-size: 19px;
  line-height: 1.35;
  font-weight: 700;
  letter-spacing: -0.012em;
  color: var(--c-mineral);
}

.page-products .stock-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--c-cool);
}

.page-products .stock-rule {
  margin-top: 4px !important;
  padding-top: 11px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--stock-accent) !important;
}

/* ---------- 03 时间轴 ---------- */

.page-products .time-layout {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
  align-items: start;
}

.page-products .time-layout .media-frame {
  margin-bottom: 0;
}

.page-products .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-products .timeline > li {
  border-bottom: 1px solid var(--line);
}

.page-products .timeline > li:first-child {
  border-top: 1px solid var(--line);
}

.page-products .timeline-node summary {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 17px 4px;
  cursor: pointer;
  list-style: none;
  transition: background 160ms var(--ease);
}

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

.page-products .timeline-node summary:hover,
.page-products .timeline-node summary:focus-visible {
  background: rgba(52, 224, 208, 0.05);
}

.page-products .timeline-node summary:focus-visible {
  outline: 2px solid var(--c-neon);
  outline-offset: -2px;
}

.page-products .timeline-node__dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-neon);
  box-shadow: 0 0 10px rgba(52, 224, 208, 0.5);
}

.page-products .timeline-node__body {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 14px;
}

.page-products .timeline-node__metric {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--c-hot);
}

.page-products .timeline-node__metric .num {
  font-size: 22px;
  font-weight: 700;
  text-shadow: 0 0 12px rgba(255, 122, 26, 0.35);
  margin-right: 0.12em;
}

.page-products .timeline-node__name {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.008em;
  color: var(--c-mineral);
}

.page-products .timeline-node__chev {
  width: 9px;
  height: 9px;
  border-right: 1px solid var(--c-cool);
  border-bottom: 1px solid var(--c-cool);
  transform: rotate(45deg);
  transition: transform 200ms var(--ease), border-color 160ms var(--ease);
}

.page-products .timeline-node[open] .timeline-node__chev {
  transform: rotate(-135deg);
  border-color: var(--c-hot);
}

.page-products .timeline-node > p {
  margin: 0;
  padding: 0 26px 20px 30px;
  max-width: 68ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--c-cool);
}

/* ---------- 04 口径对照表 ---------- */

.page-products .delta-wrap {
  overflow-x: auto;
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-products .delta-table {
  width: 100%;
  min-width: 600px;
  border-collapse: collapse;
}

.page-products .delta-table thead th {
  padding: 12px 16px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--c-cool);
  border-bottom: 1px solid var(--line-strong);
}

.page-products .delta-table tbody th,
.page-products .delta-table tbody td {
  padding: 15px 16px;
  text-align: left;
  font-size: 14.5px;
  line-height: 1.72;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.page-products .delta-table tbody th {
  font-weight: 700;
  color: var(--c-mineral);
  white-space: nowrap;
  border-left: 2px solid var(--c-clay);
}

.page-products .delta-table tbody td {
  color: var(--c-cool);
}

.page-products .delta-table tbody td:nth-child(3) {
  color: var(--c-mineral);
}

.page-products .delta-table tbody tr {
  transition: background 160ms var(--ease);
}

.page-products .delta-table tbody tr:hover {
  background: rgba(52, 224, 208, 0.05);
}

/* ---------- 05 对接流程 ---------- */

.page-products .flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-products .flow__step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 16px;
  padding: 19px 20px 21px;
  background: var(--c-void);
}

.page-products .flow__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--c-clay);
  padding-top: 3px;
}

.page-products .flow__step h3 {
  margin: 0 0 8px;
  font-size: 17px;
  line-height: 1.4;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--c-mineral);
}

.page-products .flow__step p {
  margin: 0;
  max-width: 64ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--c-cool);
}

.page-products .prod-next {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3.5vw, 30px);
}

.page-products .prod-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin-top: clamp(22px, 4vw, 34px);
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 14px;
}

.page-products .prod-links a {
  color: var(--c-cool);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-products .prod-links a:hover,
.page-products .prod-links a:focus-visible {
  color: var(--c-neon);
  border-bottom-color: var(--c-neon);
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-products .tier-rail {
    grid-auto-columns: 320px;
  }
}

@media (min-width: 900px) {
  .page-products .stock-layout {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-products .time-layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

@media (min-width: 960px) {
  .page-products .prod-top__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.6fr);
    align-items: end;
  }

  .page-products .prod-top__facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1180px) {
  .page-products .tier-rail {
    grid-auto-columns: 258px;
    gap: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-products .tier-card,
  .page-products .stock-card,
  .page-products .timeline-node summary,
  .page-products .timeline-node__chev,
  .page-products .delta-table tbody tr,
  .page-products .prod-links a {
    transition: none;
  }
}