.page-products {
  --cat-rail-w: 300px;
  --cat-gap: 64px;
  --cat-panel-pad: 24px;
  color: var(--chalk);
  background: var(--ink-base);
}

/* ---------- 首屏 ---------- */
.page-products .cat-hero {
  position: relative;
  overflow: hidden;
  padding: 40px 0 56px;
  border-bottom: 1px solid var(--hairline-strong);
}

.page-products .cat-hero__lines {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(126, 147, 166, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(126, 147, 166, 0.07) 1px, transparent 1px);
  background-size: 68px 68px;
  -webkit-mask-image: radial-gradient(130% 92% at 10% 0%, #000 0%, transparent 74%);
  mask-image: radial-gradient(130% 92% at 10% 0%, #000 0%, transparent 74%);
}

.page-products .cat-hero__inner {
  position: relative;
  display: grid;
  gap: 20px;
}

.page-products .cat-hero .eyebrow {
  margin: 0;
}

.page-products .cat-hero h1 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 32px;
  line-height: 1.28;
  letter-spacing: -0.01em;
  max-width: 20ch;
}

.page-products .cat-hero .lede {
  margin: 0;
  max-width: 60ch;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: var(--mist);
}

.page-products .cat-hero__anchor {
  margin-top: 12px;
  padding-top: 26px;
  border-top: 1px solid var(--hairline);
  display: grid;
  gap: 16px;
}

.page-products .cat-hero__num-wrap {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-products .cat-hero__num {
  font-family: var(--font-mono);
  font-size: 64px;
  line-height: 0.86;
  font-weight: 700;
  color: var(--lime-signal);
  letter-spacing: -0.03em;
}

.page-products .cat-hero__unit {
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-products .cat-hero__cap {
  margin: 0;
  max-width: 52ch;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--tactical-gray);
}

/* ---------- 目录主体：左索引 / 右详情 ---------- */
.page-products .cat-body {
  padding: 44px 0 56px;
}

.page-products .cat-cols {
  display: grid;
  gap: 32px;
}

.page-products .cat-rail {
  border-top: 1px solid var(--hairline-strong);
  padding-top: 18px;
}

.page-products .cat-rail .eyebrow {
  margin: 0 0 12px;
}

.page-products .cat-index {
  display: flex;
  flex-direction: row;
  gap: 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--hairline);
  background: var(--ink-base);
}

.page-products .cat-index__tab {
  flex: 0 0 auto;
  width: 208px;
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 14px 14px 16px;
  background: transparent;
  border: 0;
  border-bottom: 2px solid transparent;
  border-right: 1px solid var(--hairline);
  color: var(--mist);
  text-align: left;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.page-products .cat-index__tab:last-child {
  border-right: 0;
}

.page-products .cat-index__num {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--tactical-gray);
}

.page-products .cat-index__label {
  font-size: var(--fs-16);
  line-height: 1.4;
  color: inherit;
}

.page-products .cat-index__meta {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.02em;
  color: var(--tactical-gray);
}

.page-products .cat-index__tab:hover {
  background: rgba(30, 74, 62, 0.32);
  color: var(--chalk);
}

.page-products .cat-index__tab:focus-visible {
  outline: 2px solid var(--lime-signal);
  outline-offset: -2px;
}

.page-products .cat-index__tab[aria-selected="true"] {
  background: var(--ink-panel);
  border-bottom-color: var(--lime-signal);
  color: var(--chalk);
}

.page-products .cat-index__tab[aria-selected="true"] .cat-index__num {
  color: var(--lime-signal);
}

/* ---------- 更新节奏 ---------- */
.page-products .cat-rhythm {
  margin-top: 30px;
}

.page-products .cat-rhythm__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--tactical-gray);
}

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

.page-products .cat-rhythm__item {
  display: grid;
  grid-template-columns: 8px minmax(0, 1fr);
  column-gap: 12px;
  align-items: center;
  padding: 9px 0;
  border-top: 1px solid var(--hairline);
  font-size: var(--fs-12);
  line-height: 1.55;
  color: var(--mist);
}

.page-products .cat-rhythm__item:last-child {
  border-bottom: 1px solid var(--hairline);
}

.page-products .cat-rhythm__dot {
  width: 6px;
  height: 6px;
  background: var(--tactical-gray);
}

.page-products .cat-rhythm__dot--lime {
  background: var(--lime-signal);
}

.page-products .cat-rhythm__dot--amber {
  background: var(--amber-pulse);
}

/* ---------- 详情卡 ---------- */
.page-products .cat-stage {
  min-width: 0;
}

.page-products .cat-panel {
  display: block;
  background: var(--ink-panel);
  border: 1px solid var(--hairline);
  padding: var(--cat-panel-pad) 20px 26px;
}

.page-products .cat-panel[hidden] {
  display: none;
}

.page-products .cat-panel:focus-visible {
  outline: 2px solid var(--lime-signal);
  outline-offset: 3px;
}

.page-products .cat-panel__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 16px;
  align-items: start;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--hairline-strong);
  margin-bottom: 22px;
}

.page-products .cat-panel__index {
  font-family: var(--font-mono);
  font-size: var(--fs-36);
  line-height: 1;
  color: var(--lime-signal);
  letter-spacing: -0.02em;
}

.page-products .cat-panel__title {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: var(--fs-26);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--chalk);
}

.page-products .cat-panel__tags {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-products .cat-panel__body {
  display: grid;
  gap: 26px;
}

.page-products .cat-panel__lede {
  margin: 0;
  max-width: 62ch;
  font-size: var(--fs-16);
  line-height: 1.78;
  color: var(--mist);
}

.page-products .cat-fields__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--tactical-gray);
}

.page-products .cat-fields {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-top: 1px solid var(--hairline);
}

.page-products .cat-fields li {
  display: grid;
  gap: 3px;
  padding: 12px 0;
  border-bottom: 1px solid var(--hairline);
}

.page-products .cat-fields__name {
  font-size: var(--fs-14);
  font-weight: 600;
  color: var(--chalk);
  line-height: 1.5;
}

.page-products .cat-fields__desc {
  font-size: var(--fs-12);
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 图 ---------- */
.page-products .cat-figure {
  margin: 0;
  border: 1px solid var(--hairline);
  background: var(--ink-base);
}

.page-products .cat-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.48) brightness(0.92) contrast(1.06);
}

.page-products .cat-figure--square img {
  aspect-ratio: 1 / 1;
}

.page-products .cat-figure__cap {
  margin: 0;
  padding: 10px 12px;
  border-top: 1px solid var(--hairline);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  line-height: 1.6;
  color: var(--tactical-gray);
}

.page-products .cat-panel__foot {
  margin: 24px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--hairline);
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 使用场景 ---------- */
.page-products .cat-use {
  padding-bottom: 64px;
}

.page-products .cat-use .section__head {
  margin-bottom: 34px;
}

.page-products .cat-use__grid {
  display: grid;
  gap: 18px;
}

.page-products .cat-use__card {
  background: var(--ink-panel);
  border: 1px solid var(--hairline);
  border-top: 2px solid var(--pitch-line);
  padding: 22px 20px 24px;
}

.page-products .cat-use__card--fan {
  border-top-color: var(--lime-signal);
}

.page-products .cat-use__card--partner {
  border-top-color: var(--amber-pulse);
}

.page-products .cat-use__card--data {
  border-top-color: var(--tactical-gray);
}

.page-products .cat-use__title {
  margin: 0 0 12px;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: var(--fs-20);
  line-height: 1.35;
  letter-spacing: -0.005em;
  color: var(--chalk);
}

.page-products .cat-use__text {
  margin: 0 0 18px;
  font-size: var(--fs-14);
  line-height: 1.78;
  color: var(--mist);
}

.page-products .cat-use__link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: var(--lime-signal);
  text-decoration: none;
  border-bottom: 1px solid var(--lime-signal);
  padding-bottom: 2px;
}

.page-products .cat-use__link:hover {
  color: var(--lime-soft);
  border-bottom-color: var(--lime-soft);
}

.page-products .cat-use__link:focus-visible {
  outline: 2px solid var(--lime-signal);
  outline-offset: 3px;
}

/* ---------- 读取方式 ---------- */
.page-products .cat-read {
  margin-top: 40px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border: 1px solid var(--hairline);
  background: var(--ink-base);
}

.page-products .cat-read__col {
  padding: 22px 20px 24px;
  border-top: 1px solid var(--hairline);
}

.page-products .cat-read__col:first-child {
  border-top: 0;
}

.page-products .cat-read__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--lime-signal);
}

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

.page-products .cat-read__list li {
  position: relative;
  padding: 9px 0 9px 18px;
  border-bottom: 1px solid var(--hairline);
  font-size: var(--fs-14);
  line-height: 1.65;
  color: var(--mist);
}

.page-products .cat-read__list li:last-child {
  border-bottom: 0;
}

.page-products .cat-read__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 17px;
  width: 8px;
  height: 1px;
  background: var(--lime-signal);
}

/* ---------- 底部动作 ---------- */
.page-products .cat-cta {
  margin-top: 40px;
  padding-top: 26px;
  border-top: 1px solid var(--hairline);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-products .cat-panel {
    padding: 30px 28px 32px;
  }

  .page-products .cat-fields {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 34px;
  }

  .page-products .cat-hero__anchor {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: end;
    column-gap: 28px;
  }

  .page-products .cat-use__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
  }

  .page-products .cat-figure {
    max-width: 620px;
  }
}

@media (min-width: 768px) {
  .page-products .cat-hero {
    padding: 56px 0 72px;
  }

  .page-products .cat-hero__num {
    font-size: 84px;
  }

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

  .page-products .cat-read__col {
    padding: 26px 28px 30px;
    border-top: 0;
  }

  .page-products .cat-read__col + .cat-read__col {
    border-left: 1px solid var(--hairline);
  }
}

@media (min-width: 960px) {
  .page-products .cat-hero {
    padding: 72px 0 88px;
  }

  .page-products .cat-hero h1 {
    font-size: 46px;
    max-width: 18ch;
  }

  .page-products .cat-hero__num {
    font-size: 96px;
  }

  .page-products .cat-body {
    padding: 64px 0 80px;
  }

  .page-products .cat-cols {
    grid-template-columns: var(--cat-rail-w) minmax(0, 1fr);
    gap: var(--cat-gap);
    align-items: start;
  }

  .page-products .cat-index {
    flex-direction: column;
    overflow-x: visible;
    border: 0;
    border-top: 1px solid var(--hairline);
    border-bottom: 1px solid var(--hairline);
  }

  .page-products .cat-index__tab {
    width: 100%;
    display: grid;
    grid-template-columns: 34px minmax(0, 1fr);
    grid-template-rows: auto auto;
    column-gap: 12px;
    row-gap: 3px;
    padding: 15px 14px 15px 14px;
    border-right: 0;
    border-bottom: 0;
    border-left: 2px solid transparent;
  }

  .page-products .cat-index__tab:last-child {
    border-bottom: 0;
  }

  .page-products .cat-index__num {
    grid-row: 1 / span 2;
    align-self: start;
    padding-top: 3px;
  }

  .page-products .cat-index__tab[aria-selected="true"] {
    border-left-color: var(--lime-signal);
    border-bottom-color: transparent;
  }

  .page-products .cat-rhythm {
    margin-top: 34px;
  }

  .page-products .cat-panel {
    padding: 36px 36px 38px;
  }

  .page-products .cat-panel__body {
    gap: 30px;
  }

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

  .page-products .cat-use {
    padding-bottom: 96px;
  }
}

@media (min-width: 1240px) {
  .page-products .cat-hero h1 {
    font-size: 56px;
  }

  .page-products .cat-panel__title {
    font-size: var(--fs-36);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-products .cat-index__tab {
    transition: none;
  }
}