.page-about {
  --about-rail: 200px;
  background: var(--ink);
  color: var(--paper);
}

.page-about .about-top {
  padding-top: 18px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(24px, 4vw, 48px) clamp(32px, 5vw, 64px);
  border-bottom: 1px solid var(--line);
  background-image:
    radial-gradient(80% 120% at 88% -10%, rgba(61, 242, 208, 0.13), transparent 55%),
    radial-gradient(70% 100% at 0% 110%, rgba(255, 106, 42, 0.11), transparent 55%),
    linear-gradient(to right, rgba(42, 58, 74, 0.4) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 58, 74, 0.4) 1px, transparent 1px);
  background-size: auto, auto, 76px 76px, 76px 76px;
  background-position: 0 0, 0 0, 0 0, 0 0;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(2.3rem, 6.6vw, 4.3rem);
  line-height: 1.06;
  letter-spacing: -0.03em;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-hero__text {
  margin: 20px 0 0;
  max-width: 46ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--pale);
}

.page-about .about-hero__text--dim {
  margin-top: 12px;
  color: var(--mist);
  font-size: 15px;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
  background: rgba(15, 33, 51, 0.6);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 14px 14px 16px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-fact__num {
  font-family: var(--mono);
  font-size: clamp(1.45rem, 3.2vw, 2rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--paper);
}

.page-about .about-fact--signal .about-fact__num {
  color: var(--signal);
}

.page-about .about-fact--cyan .about-fact__num {
  color: var(--cyan);
}

.page-about .about-fact__label {
  font-size: 12.5px;
  line-height: 1.45;
  color: var(--mist);
}

/* ---------- 主体：索引 + 内容 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 40px);
  padding-block: clamp(32px, 5vw, 72px);
}

.page-about .about-rail {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
}

.page-about .about-rail__label {
  margin: 0;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--mist);
  text-transform: uppercase;
}

.page-about .about-flow {
  min-width: 0;
}

.page-about .about-sec {
  padding-bottom: clamp(30px, 4vw, 52px);
  margin-bottom: clamp(30px, 4vw, 52px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-sec:last-child {
  padding-bottom: 0;
  margin-bottom: 0;
  border-bottom: 0;
}

.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 18px;
}

.page-about .about-sec__num {
  flex: none;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--signal);
}

.page-about .about-sec__title {
  margin: 0;
  font-size: clamp(1.45rem, 3.4vw, 2.1rem);
  line-height: 1.25;
  letter-spacing: -0.015em;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-sec p {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--pale);
}

/* ---------- 图片容器 ---------- */
.page-about .about-media {
  margin: 22px 0 26px;
  border: 1px solid var(--line);
  background: var(--panel-soft);
  overflow: hidden;
}

.page-about .about-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-media--timeline img {
  aspect-ratio: 14 / 9;
}

/* ---------- 内容体系 ---------- */
.page-about .channel-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .channel-cell {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 18px 22px;
  background: var(--panel-soft);
  transition: background 0.3s var(--ease);
}

.page-about .channel-cell::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 0;
  height: 2px;
  background: var(--signal);
  transition: width 0.4s var(--ease);
}

.page-about .channel-cell:hover {
  background: var(--panel);
}

.page-about .channel-cell:hover::before {
  width: 100%;
}

.page-about .channel-cell__num {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .channel-cell__name {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .channel-cell p {
  margin: 0;
  max-width: none;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 0 30px;
  position: relative;
  display: grid;
  gap: 26px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--signal) 62%, rgba(42, 58, 74, 0) 100%);
}

.page-about .tl-item {
  position: relative;
  display: grid;
  gap: 8px;
  min-width: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 10px;
  width: 11px;
  height: 11px;
  background: var(--ink);
  border: 1px solid var(--cyan);
  transform: rotate(45deg);
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .tl-item:hover::before {
  background: var(--cyan);
}

.page-about .tl-item--now::before {
  border-color: var(--signal);
  background: var(--signal);
}

.page-about .tl-item__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}

.page-about .tl-item__year {
  font-family: var(--mono);
  font-size: clamp(1.55rem, 3.6vw, 2.15rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .tl-item__phase {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  padding: 3px 8px;
  border: 1px solid var(--line);
  color: var(--mist);
  white-space: nowrap;
}

.page-about .tl-item--now .tl-item__phase {
  border-color: var(--signal);
  color: var(--signal);
}

.page-about .tl-item p {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .team-cell {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 18px 24px;
  background: var(--panel-soft);
  border-top: 2px solid transparent;
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .team-cell:hover {
  background: var(--panel);
  border-top-color: var(--cyan);
}

.page-about .team-cell__num {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--signal);
}

.page-about .team-cell__name {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .team-cell p {
  margin: 0;
  max-width: none;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 更新节奏 ---------- */
.page-about .cadence {
  margin-top: 22px;
  border-top: 1px solid var(--line);
}

.page-about .cadence__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .cadence__key {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .cadence__row p {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--pale);
}

/* ---------- 协作与监控 ---------- */
.page-about .partner-strip {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 22px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .partner-cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 18px;
  background: var(--panel-soft);
}

.page-about .partner-cell__num {
  font-family: var(--mono);
  font-size: clamp(1.4rem, 3vw, 1.85rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .partner-cell__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 继续浏览 ---------- */
.page-about .about-next {
  border-top: 1px solid var(--line);
  padding-block: clamp(32px, 5vw, 64px);
  background: linear-gradient(180deg, rgba(15, 33, 51, 0.92), rgba(8, 19, 31, 1));
}

.page-about .about-next__title {
  margin: 0 0 10px;
  font-size: clamp(1.3rem, 2.8vw, 1.9rem);
  line-height: 1.3;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .about-next__lead {
  margin: 0 0 26px;
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-next__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-next__card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 18px 22px;
  background: var(--panel-soft);
  color: inherit;
  text-decoration: none;
  transition: background 0.3s var(--ease);
}

.page-about .about-next__card:hover {
  background: var(--panel);
}

.page-about .about-next__k {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.page-about .about-next__name {
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-next__desc {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .about-next__arrow {
  margin-top: auto;
  font-family: var(--mono);
  font-size: 15px;
  color: var(--mist);
  transition: transform 0.3s var(--ease), color 0.3s var(--ease);
}

.page-about .about-next__card:hover .about-next__arrow {
  transform: translateX(4px);
  color: var(--signal);
}

/* ---------- 移动端索引横滑 ---------- */
@media (max-width: 959px) {
  .page-about .toc {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 6px;
    -webkit-overflow-scrolling: touch;
  }

  .page-about .toc .toc__link {
    flex: 0 0 auto;
    white-space: nowrap;
  }
}

@media (min-width: 620px) {
  .page-about .channel-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .cadence__row {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }

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

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

@media (min-width: 780px) {
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    align-items: end;
    gap: clamp(32px, 4vw, 56px);
  }

  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }

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

@media (min-width: 1040px) {
  .page-about .channel-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
<<<END>>>