.page-about {
  --about-text: #C6DCD2;
  --about-railw: 236px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(84px, 13vh, 148px) 0 0;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(110% 80% at 88% -10%, rgba(198, 255, 61, .18), transparent 60%),
    radial-gradient(80% 70% at 0% 105%, rgba(255, 122, 47, .10), transparent 62%),
    linear-gradient(180deg, var(--ink-3) 0%, var(--ink) 72%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(159, 255, 224, .055) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(159, 255, 224, .055) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(75% 68% at 58% 22%, #000, transparent 78%);
  mask-image: radial-gradient(75% 68% at 58% 22%, #000, transparent 78%);
}

.page-about .about-hero .breadcrumb {
  margin: 0 0 clamp(26px, 4vw, 46px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 3vw, 40px);
  padding-bottom: clamp(34px, 5vw, 64px);
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--lime-dim);
}

.page-about .about-kicker__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 3px rgba(198, 255, 61, .18);
}

.page-about .about-hero h1 {
  margin: 16px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(32px, 7.2vw, 74px);
  line-height: 1.03;
  letter-spacing: -.035em;
  color: var(--fog);
  text-wrap: balance;
}

.page-about .about-hero__accent {
  display: inline-block;
  color: var(--lime);
  padding-right: .05em;
  background: linear-gradient(transparent 70%, rgba(198, 255, 61, .20) 70%);
}

.page-about .about-hero__lead {
  max-width: 58ch;
  margin: clamp(16px, 2vw, 24px) 0 0;
  font-size: clamp(15px, 1.1vw, 17px);
  line-height: 1.7;
  color: var(--about-text);
}

.page-about .about-hero__aside {
  padding: clamp(16px, 2vw, 22px);
  border: 1px solid var(--line-hard);
  background: linear-gradient(160deg, rgba(159, 255, 224, .12), rgba(159, 255, 224, .02));
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .about-hero__aside-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--mute);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 10px;
  font-size: 13px;
  line-height: 1.4;
  border-bottom: 1px dashed rgba(159, 255, 224, .16);
}

.page-about .about-hero__facts li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-fact-k {
  color: var(--mute);
}

.page-about .about-fact-v {
  flex: none;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--lime);
}

/* ---------- 三段信息带 ---------- */
.page-about .about-strip {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  margin: 0 calc(clamp(20px, 5vw, 64px) * -1);
  padding: 0 clamp(20px, 5vw, 64px);
  border-top: 1px solid var(--line);
  background: rgba(4, 26, 20, .58);
}

.page-about .about-strip__cell {
  padding: clamp(16px, 2.2vw, 24px) 0;
  border-bottom: 1px solid rgba(159, 255, 224, .10);
}

.page-about .about-strip__cell:last-child {
  border-bottom: 0;
}

.page-about .about-strip__k {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--orange);
}

.page-about .about-strip p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.55;
  color: var(--about-text);
}

/* ---------- 主体双栏 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4vw, 56px);
  padding: clamp(40px, 6vw, 88px) 0 clamp(56px, 8vw, 104px);
}

/* ---------- 左侧时间轴轨道 ---------- */
.page-about .about-track {
  position: relative;
  padding-left: 20px;
  border-left: 1px solid var(--line-lime);
}

.page-about .about-track__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--mute);
}

.page-about .about-track__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .track-item {
  position: relative;
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 8px;
  align-items: baseline;
  padding: 10px 10px 10px 0;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: background .18s var(--ease), border-color .18s var(--ease);
}

.page-about .track-item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 17px;
  width: 7px;
  height: 7px;
  background: var(--ink);
  border: 1px solid var(--lime-dim);
  transform: rotate(45deg);
  transition: background .18s var(--ease), border-color .18s var(--ease);
}

.page-about .track-item:hover,
.page-about .track-item:focus-visible {
  background: rgba(198, 255, 61, .07);
  border-bottom-color: var(--line-lime);
}

.page-about .track-item:hover::before,
.page-about .track-item:focus-visible::before {
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .track-item__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--lime-dim);
}

.page-about .track-item__label {
  font-size: 13.5px;
  line-height: 1.45;
  color: var(--about-text);
  transition: color .18s var(--ease);
}

.page-about .track-item:hover .track-item__label,
.page-about .track-item:focus-visible .track-item__label {
  color: var(--lime);
}

/* ---------- 内容列 ---------- */
.page-about .about-content {
  display: grid;
  gap: clamp(40px, 5vw, 76px);
  min-width: 0;
}

.page-about .about-section {
  min-width: 0;
  scroll-margin-top: 96px;
}

.page-about .sec-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-top: 16px;
  margin-bottom: clamp(16px, 2vw, 24px);
  border-top: 1px solid var(--line);
}

.page-about .sec-num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--lime);
}

.page-about .sec-title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(21px, 2.6vw, 32px);
  line-height: 1.22;
  letter-spacing: -.015em;
  color: var(--fog);
}

.page-about .about-prose p {
  margin: 0 0 14px;
  font-size: clamp(15px, 1.05vw, 16.5px);
  line-height: 1.74;
  color: var(--about-text);
}

.page-about .about-prose p:last-child {
  margin-bottom: 0;
}

.page-about .about-prose strong {
  color: var(--fog);
  font-weight: 700;
}

.page-about .about-prose--tight {
  margin-top: clamp(16px, 2.4vw, 24px);
}

/* ---------- 图文 ---------- */
.page-about .about-figure {
  margin: clamp(20px, 3vw, 32px) 0 0;
  border: 1px solid var(--line);
  background: linear-gradient(150deg, rgba(12, 58, 46, .7), rgba(4, 26, 20, .7));
}

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

.page-about .about-figure .media__cap {
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .04em;
  color: var(--mute);
  border-top: 1px solid var(--line);
}

/* ---------- 分栏 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
}

/* ---------- 层级卡 ---------- */
.page-about .about-levels {
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .about-level {
  padding: 14px 16px;
  border: 1px solid var(--line);
  background: linear-gradient(150deg, rgba(12, 58, 46, .92), rgba(6, 35, 28, .86));
  transition: border-color .18s var(--ease), transform .18s var(--ease);
}

.page-about .about-level:hover {
  border-color: var(--line-lime);
  transform: translateY(-2px);
}

.page-about .about-level--1 { border-left: 3px solid var(--lime); }
.page-about .about-level--2 { border-left: 3px solid var(--lime-dim); margin-left: 14px; }
.page-about .about-level--3 { border-left: 3px solid var(--yellow); margin-left: 28px; }

.page-about .about-level__k {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--mute);
}

.page-about .about-level__n {
  display: block;
  margin: 6px 0 4px;
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  color: var(--fog);
}

.page-about .about-level__t {
  margin: 0;
  font-size: 13px;
  line-height: 1.55;
  color: var(--about-text);
}

/* ---------- 切换体验 ---------- */
.page-about .about-switch {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
}

.page-about .about-glass {
  align-self: start;
  padding: clamp(18px, 2.4vw, 24px);
  border: 1px solid var(--line-hard);
  background: linear-gradient(155deg, rgba(159, 255, 224, .14), rgba(159, 255, 224, .03));
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  clip-path: polygon(0 var(--cut), var(--cut) 0, 100% 0, 100% 100%, 0 100%);
}

.page-about .about-glass__title {
  margin: 0 0 14px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--lime);
}

.page-about .about-steps {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-steps li {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--about-text);
}

.page-about .about-steps__n {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink);
  background: var(--lime);
}

/* ---------- 团队数据 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(20px, 2.8vw, 28px) 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stat {
  padding: clamp(14px, 2vw, 20px);
  background: var(--ink-2);
  transition: background .18s var(--ease);
}

.page-about .about-stat:hover {
  background: rgba(198, 255, 61, .10);
}

.page-about .about-stat__n {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1;
  color: var(--lime);
}

.page-about .about-stat__k {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.45;
  color: var(--mute);
}

/* ---------- 横向信息带 ---------- */
.page-about .about-band {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: clamp(16px, 2.4vw, 24px) clamp(16px, 2.6vw, 26px);
  border: 1px solid var(--line-lime);
  background: linear-gradient(100deg, rgba(198, 255, 61, .13), rgba(255, 122, 47, .09) 62%, rgba(159, 255, 224, .03));
}

.page-about .about-band__k {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--orange);
}

.page-about .about-band p {
  margin: 6px 0 0;
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--about-text);
}

/* ---------- 图例 ---------- */
.page-about .about-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-legend li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  font-size: 12.5px;
  color: var(--about-text);
  border: 1px solid var(--line);
  transition: border-color .18s var(--ease), color .18s var(--ease);
}

.page-about .about-legend li:hover {
  border-color: var(--line-lime);
  color: var(--fog);
}

.page-about .about-legend__dot {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.page-about .about-legend__dot--lime { background: var(--lime); }
.page-about .about-legend__dot--orange { background: var(--orange); }
.page-about .about-legend__dot--yellow { background: var(--yellow); }

/* ---------- 时间节点标签 ---------- */
.page-about .about-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-chips li {
  padding: 6px 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--lime);
  border: 1px solid var(--line-lime);
  background: rgba(198, 255, 61, .06);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.6vw, 28px);
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid var(--line-hard);
  background: linear-gradient(155deg, rgba(12, 58, 46, .95), rgba(4, 26, 20, .96));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-content: start;
}

/* ---------- 断点 ---------- */
@media (min-width: 700px) {
  .page-about .about-band {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(14px, 2vw, 28px);
  }

  .page-about .about-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 clamp(16px, 2.4vw, 34px);
  }

  .page-about .about-strip__cell {
    padding: clamp(18px, 2.4vw, 26px) 0;
    border-bottom: 0;
  }
}

@media (min-width: 760px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    align-items: start;
  }

  .page-about .about-switch {
    grid-template-columns: minmax(0, 1fr) minmax(0, 300px);
    align-items: start;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 820px) {
  .page-about .about-next {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-about .about-next__actions {
    justify-content: flex-end;
    max-width: 320px;
  }
}

@media (min-width: 940px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(260px, 320px);
    align-items: end;
    gap: clamp(32px, 4vw, 72px);
  }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-railw) minmax(0, 1fr);
    gap: clamp(36px, 4.5vw, 80px);
  }

  .page-about .about-track {
    position: sticky;
    top: 96px;
    align-self: start;
  }
}

@media (max-width: 560px) {
  .page-about .about-level--2 { margin-left: 8px; }
  .page-about .about-level--3 { margin-left: 16px; }

  .page-about .about-hero__facts li {
    flex-wrap: wrap;
    gap: 4px;
  }

  .page-about .about-next__actions .btn {
    flex: 1 1 100%;
    text-align: center;
  }
}
<<<PAGE_CSS_END>>>