.page-products {
  --pd-gap: clamp(1.5rem, 4vw, 3.25rem);
  --pd-pad: clamp(1rem, 3vw, 1.5rem);
  display: block;
  background: var(--ink-900);
  color: var(--paper);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-products .prod-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(1.75rem, 4vw, 2.75rem) 0 clamp(2.5rem, 7vw, 5rem);
  border-bottom: 1px solid var(--line);
}

.page-products .prod-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -34%;
  right: -22%;
  width: min(760px, 108vw);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: radial-gradient(circle at 42% 42%,
      rgba(63, 232, 196, 0.30) 0%,
      rgba(18, 169, 143, 0.10) 46%,
      rgba(10, 21, 18, 0) 72%);
  pointer-events: none;
}

.page-products .prod-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  left: -16%;
  bottom: -46%;
  width: min(540px, 82vw);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 50%,
      rgba(255, 138, 60, 0.16) 0%,
      rgba(10, 21, 18, 0) 68%);
  pointer-events: none;
}

.page-products .prod-hero .breadcrumb {
  margin-bottom: clamp(1.5rem, 4vw, 2.5rem);
}

.page-products .prod-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 3rem);
}

.page-products .prod-hero__title {
  margin: 0.85rem 0 0;
  max-width: 20ch;
  font-size: clamp(1.85rem, 5.6vw, 3.4rem);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-products .prod-hero__copy .lede {
  margin-top: 1.25rem;
  max-width: 36em;
}

.page-products .prod-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.page-products .prod-hero__panel {
  position: relative;
  padding: clamp(1.25rem, 3vw, 1.85rem);
  border: 1px solid var(--line);
  border-radius: var(--radius-soft);
  background: linear-gradient(155deg, var(--ink-700) 0%, var(--ink-800) 60%, var(--ink-900) 100%);
  box-shadow: 0 28px 64px -46px rgba(63, 232, 196, 0.55);
}

.page-products .prod-hero__panel::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--orange) 100%);
  border-radius: 3px 0 0 3px;
}

.page-products .prod-panel__title {
  margin: 0 0 1.15rem;
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-products .prod-stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.1rem;
}

.page-products .prod-stat {
  padding-top: 0.7rem;
  border-top: 1px solid var(--line);
}

.page-products .prod-stat__value {
  margin: 0;
  font-size: clamp(1.7rem, 4.6vw, 2.5rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-products .prod-stat__unit {
  margin-left: 0.35rem;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-products .prod-stat__label {
  margin: 0.5rem 0 0;
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 通用小节头部辅助 ---------- */
.page-products .prod-sec-meta {
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  color: var(--muted);
  white-space: nowrap;
}

.page-products .prod-intro {
  margin: 0 0 clamp(1.5rem, 4vw, 2.25rem);
  color: var(--muted);
}

/* ---------- 三件产品 ---------- */
.page-products .prod-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-products .prod-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.85rem;
  padding: clamp(1.35rem, 3.5vw, 2.1rem) 0;
  border-bottom: 1px solid var(--line);
}

.page-products .prod-item__num {
  font-size: 0.8125rem;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-products .prod-item__title {
  margin: 0 0 0.6rem;
  font-size: clamp(1.15rem, 2.8vw, 1.5rem);
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--paper);
}

.page-products .prod-item__text {
  margin: 0;
  max-width: 46em;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-products .prod-item__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

/* ---------- 指标矩阵 ---------- */
.page-products .prod-matrix {
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--ink-800);
  overflow: hidden;
}

.page-products .prod-matrix__head {
  display: none;
  grid-template-columns: minmax(180px, 0.85fr) minmax(0, 2fr) 46px;
  gap: 1.25rem;
  padding: 0.7rem var(--pd-pad);
  background: var(--ink-700);
  border-bottom: 1px solid var(--line);
  font-size: 0.625rem;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.page-products .prod-row {
  border-bottom: 1px solid var(--line-soft);
}

.page-products .prod-row:last-child {
  border-bottom: 0;
}

.page-products .prod-row__summary {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.6rem;
  padding: 1.15rem var(--pd-pad);
  cursor: pointer;
  list-style: none;
  transition: background 0.3s var(--ease);
}

.page-products .prod-row__summary::-webkit-details-marker {
  display: none;
}

.page-products .prod-row__summary::marker {
  content: "";
}

.page-products .prod-row__summary:hover {
  background: rgba(23, 48, 42, 0.55);
}

.page-products .prod-row[open] > .prod-row__summary {
  background: rgba(23, 48, 42, 0.75);
}

.page-products .prod-row__key {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.page-products .prod-row__name {
  font-size: clamp(1rem, 2.4vw, 1.2rem);
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--paper);
}

.page-products .prod-row__desc {
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-products .prod-row__toggle {
  position: relative;
  width: 26px;
  height: 26px;
  border: 1px solid var(--line);
  border-radius: 50%;
  justify-self: start;
}

.page-products .prod-row__toggle::before,
.page-products .prod-row__toggle::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  background: var(--cyan);
  border-radius: 1px;
  transform: translate(-50%, -50%);
  transition: opacity 0.25s var(--ease);
}

.page-products .prod-row__toggle::before {
  width: 11px;
  height: 1.5px;
}

.page-products .prod-row__toggle::after {
  width: 1.5px;
  height: 11px;
}

.page-products .prod-row[open] .prod-row__toggle::after {
  opacity: 0;
}

.page-products .prod-row__body {
  padding: 0 var(--pd-pad) 1.5rem;
  animation: pd-open 0.32s var(--ease) both;
}

@keyframes pd-open {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-products .prod-row__body > p {
  margin: 0;
  max-width: 46em;
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-products .pf-inline {
  color: var(--cyan);
  font-size: 0.8125rem;
}

.page-products .prod-fields {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.55rem;
}

.page-products .prod-fields li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.55rem;
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--muted);
}

.page-products .pf-key {
  flex: 0 0 auto;
  min-width: 5.5em;
  font-size: 0.75rem;
  color: var(--cyan);
}

.page-products .prod-formula {
  margin: 1rem 0 0;
  padding: 0.8rem 1rem;
  border-left: 2px solid var(--cyan);
  border-radius: 0 3px 3px 0;
  background: rgba(18, 169, 143, 0.09);
  font-size: 0.8125rem;
  line-height: 1.8;
  color: var(--paper);
  overflow-x: auto;
}

.page-products .prod-derive {
  margin: clamp(1.5rem, 4vw, 2.25rem) 0 0;
  padding-left: 1rem;
  border-left: 2px solid var(--orange);
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-products .prod-derive strong {
  color: var(--paper);
  font-weight: 700;
}

/* ---------- 算法双栏 ---------- */
.page-products .prod-duo {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-products .prod-duo__left {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.page-products .prod-algo {
  padding: clamp(1.15rem, 3vw, 1.6rem);
  border: 1px solid var(--line);
  border-radius: var(--radius-soft);
  background: linear-gradient(160deg, var(--ink-800) 0%, var(--ink-900) 100%);
}

.page-products .prod-algo__head {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.85rem;
}

.page-products .prod-algo__title {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--paper);
}

.page-products .prod-algo__text {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-products .prod-algo__formula {
  margin: 1rem 0 0;
  font-size: clamp(0.8125rem, 2.2vw, 0.9375rem);
  line-height: 1.8;
  color: var(--cyan);
  word-break: break-word;
}

.page-products .prod-duo__right {
  display: block;
}

.page-products .prod-duo__note {
  margin: 1rem 0 0;
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-products .prod-frame {
  margin: 0;
}

.page-products .prod-frame--square {
  margin-top: 1.25rem;
}

/* ---------- 轮次条带 ---------- */
.page-products .prod-rhythm {
  padding: clamp(1rem, 3vw, 1.5rem);
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--ink-800);
}

.page-products .prod-rhythm__row {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 0;
  border-bottom: 1px dashed var(--line-soft);
}

.page-products .prod-rhythm__row:last-child {
  border-bottom: 0;
}

.page-products .prod-rhythm__label {
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-products .prod-rhythm__track {
  position: relative;
  height: 28px;
  border-radius: 3px;
  background: linear-gradient(90deg, rgba(42, 65, 57, 0.55) 0%, rgba(42, 65, 57, 0.12) 100%);
  overflow: hidden;
}

.page-products .prod-rhythm__track::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg,
      rgba(42, 65, 57, 0.9) 0 1px,
      transparent 1px 34px);
  pointer-events: none;
}

.page-products .prod-dot {
  position: absolute;
  top: 50%;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.page-products .prod-dot--pen {
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(63, 232, 196, 0.18);
}

.page-products .prod-dot--yellow {
  background: var(--card-yellow);
  box-shadow: 0 0 0 3px rgba(245, 192, 41, 0.16);
}

.page-products .prod-dot--red {
  background: var(--card-red);
  box-shadow: 0 0 0 3px rgba(228, 71, 47, 0.2);
}

.page-products .prod-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 2.75rem);
  margin-top: clamp(1.75rem, 4vw, 2.75rem);
}

.page-products .prod-split__title {
  margin: 0 0 0.7rem;
  font-size: clamp(1.0625rem, 2.6vw, 1.3rem);
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--paper);
}

.page-products .prod-split__col > p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 抢断区域 ---------- */
.page-products .prod-zone-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 2.5rem);
}

.page-products .prod-zones {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.75rem;
}

.page-products .prod-zone {
  position: relative;
  padding: 1.1rem 1.1rem 1.1rem 1.4rem;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--ink-800);
}

.page-products .prod-zone::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--cyan-dim) 100%);
}

.page-products .prod-zone__title {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--paper);
}

.page-products .prod-zone__sub {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--cyan-dim);
}

.page-products .prod-zone > p {
  margin: 0.75rem 0 0;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 筛选与导出 ---------- */
.page-products .prod-export {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-products .prod-steps {
  list-style: none;
  margin: 0 0 1.75rem;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.15rem;
}

.page-products .prod-steps__item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 0.85rem;
  align-items: start;
}

.page-products .prod-steps__num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border: 1px solid var(--line);
  border-radius: 50%;
  font-size: 0.75rem;
  color: var(--cyan);
}

.page-products .prod-steps__title {
  margin: 0.2rem 0 0.4rem;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--paper);
}

.page-products .prod-steps__item p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-products .prod-export__tabs {
  padding: clamp(1.15rem, 3vw, 1.5rem);
  border: 1px solid var(--line);
  border-radius: var(--radius-soft);
  background: linear-gradient(170deg, var(--ink-700) 0%, var(--ink-800) 100%);
}

.page-products .prod-export__tabbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.page-products .prod-export__panel + .prod-export__panel {
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px dashed var(--line-soft);
}

.page-products .prod-export__panel-title {
  margin: 0 0 0.75rem;
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-products .prod-export__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.page-products .prod-export__list li {
  position: relative;
  padding-left: 1rem;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-products .prod-export__list li::before {
  content: "";
  position: absolute;
  top: 0.72em;
  left: 0;
  width: 5px;
  height: 1px;
  background: var(--cyan-dim);
}

.page-products .prod-cite {
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
  max-width: 48em;
  font-size: 0.875rem;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 下一步 ---------- */
.page-products .prod-next {
  border-top: 1px solid var(--line);
}

.page-products .prod-next__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.75rem;
  margin-top: clamp(1.25rem, 3vw, 2rem);
}

.page-products .prod-next__card {
  display: block;
  padding: 1.15rem 1.25rem;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--ink-800);
  text-decoration: none;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-products .prod-next__card:hover,
.page-products .prod-next__card:focus-visible {
  border-color: var(--cyan-dim);
  background: var(--ink-700);
  transform: translateY(-2px);
}

.page-products .prod-next__step {
  display: block;
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-products .prod-next__name {
  display: block;
  margin-top: 0.55rem;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--paper);
}

.page-products .prod-next__text {
  display: block;
  margin-top: 0.45rem;
  font-size: 0.8125rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 窄屏适配 ---------- */
@media (max-width: 460px) {
  .page-products .prod-sec-meta {
    white-space: normal;
  }

  .page-products .prod-rhythm__row {
    grid-template-columns: minmax(0, 1fr);
    gap: 0.5rem;
  }

  .page-products .prod-fields li {
    flex-direction: column;
    gap: 0.15rem;
  }

  .page-products .pf-key {
    min-width: 0;
  }
}

/* ---------- 768px 以上 ---------- */
@media (min-width: 768px) {
  .page-products .prod-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
  }

  .page-products .prod-item {
    grid-template-columns: 68px minmax(0, 1fr);
    gap: 1.5rem;
  }

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

  .page-products .prod-zones {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

/* ---------- 900px 以上：首屏错位双栏 ---------- */
@media (min-width: 900px) {
  .page-products .prod-hero__inner {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: end;
    gap: clamp(2rem, 5vw, 4rem);
  }

  .page-products .prod-hero__panel {
    margin-bottom: 0.5rem;
  }
}

/* ---------- 860px 以上：指标矩阵固定左列 ---------- */
@media (min-width: 860px) {
  .page-products .prod-matrix__head {
    display: grid;
  }

  .page-products .prod-row__summary {
    grid-template-columns: minmax(180px, 0.85fr) minmax(0, 2fr) 46px;
    align-items: center;
    gap: 1.25rem;
  }

  .page-products .prod-row__toggle {
    justify-self: end;
  }
}

/* ---------- 960px 以上：算法与分区横向铺开 ---------- */
@media (min-width: 960px) {
  .page-products .prod-duo {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: start;
  }

  .page-products .prod-zone-layout {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

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

  .page-products .prod-export {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }
}

/* ---------- 1100px 以上：下一步四列 ---------- */
@media (min-width: 1100px) {
  .page-products .prod-next__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 降低动态效果 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-products .prod-row__body {
    animation: none;
  }

  .page-products .prod-next__card,
  .page-products .prod-row__summary,
  .page-products .prod-row__toggle::before,
  .page-products .prod-row__toggle::after {
    transition: none;
  }
}
<<<END>>>