.page-about {
  --about-rail-w: 236px;
  background: var(--ink);
  color: var(--text);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .pa-crumbs {
  margin-bottom: clamp(18px, 3vw, 26px);
}

/* ===== 首屏 ===== */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  padding: clamp(26px, 4vw, 48px) 0 clamp(34px, 5vw, 64px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -150px;
  right: -130px;
  width: 440px;
  height: 440px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(47, 227, 234, .16), transparent 68%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
  opacity: .35;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(26px, 4vw, 46px);
  align-items: center;
}

.page-about .about-hero .pa-eyebrow {
  margin-top: clamp(14px, 2vw, 20px);
  color: var(--cyan);
}

.page-about .about-hero .pa-h1 {
  margin: 10px 0 0;
  max-width: 18ch;
}

.page-about .about-hero .pa-lead {
  margin-top: 18px;
  max-width: 46ch;
}

/* 首屏数据 */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
  margin: clamp(24px, 3vw, 34px) 0 0;
  padding: 0;
}

.page-about .about-stats > div {
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.page-about .about-stats dt {
  margin: 0;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--muted);
}

.page-about .about-stats dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(21px, 2.6vw, 28px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan-soft);
}

/* 首屏档案堆叠视觉 */
.page-about .about-stack {
  position: relative;
  min-height: 232px;
  margin-top: 6px;
}

.page-about .about-stack__card {
  position: absolute;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .about-stack__card--back {
  top: 6px;
  right: 20px;
  bottom: 44px;
  left: 0;
  transform: rotate(-4deg);
  background: var(--panel);
  opacity: .45;
}

.page-about .about-stack__card--mid {
  top: 22px;
  right: 0;
  bottom: 22px;
  left: 20px;
  transform: rotate(2.5deg);
  background: var(--panel-2);
  opacity: .6;
}

.page-about .about-stack__card--front {
  top: 42px;
  right: 12px;
  bottom: 8px;
  left: 34px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 6px;
  padding: 18px;
  background: linear-gradient(158deg, #13334f 0%, #0a1826 100%);
  box-shadow: var(--shadow-lift);
}

.page-about .about-stack__chip {
  align-self: flex-start;
  padding: 4px 10px;
  border: 1px solid rgba(47, 227, 234, .45);
  border-radius: 999px;
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-about .about-stack__big {
  font-family: var(--font-mono);
  font-size: clamp(38px, 6vw, 54px);
  font-weight: 700;
  line-height: 1;
  color: var(--white);
}

.page-about .about-stack__sub {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}

.page-about .about-stack__bar {
  display: block;
  height: 3px;
  margin-top: 10px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--lime) 60%, transparent);
}

/* ===== 主布局 ===== */
.page-about .about-layout {
  display: grid;
  gap: clamp(22px, 3vw, 32px);
  padding-top: clamp(28px, 4vw, 48px);
}

/* ===== 左侧索引 ===== */
.page-about .about-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--muted);
}

.page-about .about-rail__nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 10px;
  scrollbar-width: thin;
}

.page-about .about-rail__link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  color: var(--muted);
  font-size: 14px;
  white-space: nowrap;
  text-decoration: none;
  transition: color .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--white);
  border-color: var(--cyan);
}

.page-about .about-rail__link[data-active="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  opacity: .8;
}

.page-about .about-rail__card {
  display: none;
}

/* ===== 面板 ===== */
.page-about .about-body {
  min-width: 0;
}

.page-about .about-panel {
  --accent: var(--cyan);
  position: relative;
  margin-bottom: clamp(20px, 3vw, 30px);
  padding: clamp(22px, 3vw, 36px);
  background: linear-gradient(180deg, var(--panel) 0%, #0b1a2c 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .about-panel--lime {
  --accent: var(--lime);
}

.page-about .about-panel--orange {
  --accent: var(--orange);
}

.page-about .about-panel::before {
  content: "";
  position: absolute;
  top: clamp(22px, 3vw, 36px);
  bottom: clamp(22px, 3vw, 36px);
  left: 0;
  width: 3px;
  border-radius: 3px;
  background: var(--accent);
  opacity: .85;
}

.page-about .about-panel__eyebrow {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--accent);
}

.page-about .about-panel .pa-h2 {
  margin: 0 0 14px;
  color: var(--white);
}

.page-about .about-panel .pa-text + .pa-text {
  margin-top: 14px;
}

.page-about .about-panel--closing {
  background: linear-gradient(150deg, #1a2a3f 0%, #0d1c2e 70%);
}

/* 事实清单 */
.page-about .about-facts {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-facts li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-facts__k {
  flex: 0 0 auto;
  min-width: 78px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--muted);
}

.page-about .about-facts__v {
  font-size: 15px;
  color: var(--white);
}

/* 三层结构 */
.page-about .about-layers {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-layers__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "key count"
    "desc desc";
  gap: 4px 14px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  border-radius: var(--radius-sm);
  background: var(--panel-2);
}

.page-about .about-layers__row--2 {
  border-left-color: var(--cyan-soft);
  background: rgba(22, 50, 79, .78);
}

.page-about .about-layers__row--3 {
  border-left-color: var(--lime);
  background: rgba(22, 50, 79, .56);
}

.page-about .about-layers__key {
  grid-area: key;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-layers__count {
  grid-area: count;
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  color: var(--cyan-soft);
}

.page-about .about-layers__desc {
  grid-area: desc;
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
}

/* 图片 */
.page-about .about-figure {
  margin: 24px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--panel-2);
}

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

.page-about .about-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
}

/* 更新节奏 */
.page-about .about-cadence {
  display: grid;
  gap: 10px;
  margin-top: 22px;
}

.page-about .about-cadence__item {
  display: grid;
  gap: 6px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(22, 50, 79, .5);
}

.page-about .about-cadence__tag {
  justify-self: start;
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(200, 255, 77, .14);
  border: 1px solid rgba(200, 255, 77, .4);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--lime);
}

.page-about .about-cadence__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text);
}

/* 团队 */
.page-about .about-team {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-team__item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  grid-template-areas:
    "num role"
    "num desc";
  gap: 2px 14px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--panel-2);
}

.page-about .about-team__num {
  grid-area: num;
  align-self: center;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-team__role {
  grid-area: role;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-team__desc {
  grid-area: desc;
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
}

/* 指标 */
.page-about .about-metrics {
  display: grid;
  gap: 10px;
  margin-top: 22px;
}

.page-about .about-metrics__item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid rgba(255, 122, 61, .32);
  border-radius: var(--radius-sm);
  background: rgba(255, 122, 61, .08);
}

.page-about .about-metrics__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.2vw, 30px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange-soft);
}

.page-about .about-metrics__label {
  font-size: 13px;
  color: var(--text);
}

/* 里程碑刻度尺 */
.page-about .about-ruler {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-ruler__item {
  position: relative;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.page-about .about-ruler__item::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  width: 30px;
  height: 3px;
  border-radius: 2px;
  background: var(--lime);
}

.page-about .about-ruler__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--lime);
}

.page-about .about-ruler__text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text);
}

/* 收束按钮 */
.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ===== 平板 ===== */
@media (min-width: 620px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-cadence {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-metrics__item {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ===== 桌面 ===== */
@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-stack {
    min-height: 296px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(30px, 4vw, 54px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: clamp(72px, 9vh, 104px);
  }

  .page-about .about-rail__nav {
    display: grid;
    gap: 6px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__link {
    border-radius: var(--radius-sm);
    padding: 11px 14px;
    justify-content: flex-start;
  }

  .page-about .about-rail__card {
    display: block;
    margin-top: 18px;
    padding: 16px;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: var(--panel);
  }

  .page-about .about-rail__card-title {
    margin: 0 0 8px;
    font-size: 14px;
    font-weight: 700;
    color: var(--white);
  }

  .page-about .about-rail__card-text {
    margin: 0;
    font-size: 13px;
    line-height: 1.7;
    color: var(--muted);
  }

  .page-about .about-rail__card-link {
    display: inline-block;
    margin-top: 12px;
    font-size: 13px;
    color: var(--orange);
    text-decoration: none;
    border-bottom: 1px solid rgba(255, 122, 61, .45);
  }

  .page-about .about-rail__card-link:hover,
  .page-about .about-rail__card-link:focus-visible {
    color: var(--orange-soft);
  }

  .page-about .about-layers__row {
    grid-template-columns: 128px 72px minmax(0, 1fr);
    grid-template-areas: "key count desc";
    align-items: center;
    gap: 14px;
  }

  .page-about .about-layers__row--2 {
    margin-left: 16px;
  }

  .page-about .about-layers__row--3 {
    margin-left: 32px;
  }

  .page-about .about-ruler {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .about-ruler__item {
    padding: 22px 16px 0 0;
  }

  .page-about .about-ruler__text {
    font-size: 13px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-team {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-team__item {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "num"
      "role"
      "desc";
    gap: 6px;
  }

  .page-about .about-team__num {
    font-size: 30px;
  }
}

/* ===== 降低动效 ===== */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-rail__card-link {
    transition-duration: .01ms;
  }

  .page-about .about-stack__card {
    transform: none;
  }
}
<<<END>>>