.page-about {
  position: relative;
  overflow-x: clip;
  color: var(--ice);
  background: var(--ink);
  padding-bottom: 4rem;
}

.page-about .breadcrumb {
  margin: 1.25rem 0 0.5rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: 1rem 3rem;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -6rem;
  right: -8rem;
  width: 62vw;
  height: 62vw;
  max-width: 760px;
  max-height: 760px;
  background:
    radial-gradient(circle at 42% 42%, rgba(53, 214, 255, 0.18), transparent 62%),
    radial-gradient(circle at 68% 70%, rgba(184, 255, 61, 0.1), transparent 60%);
  filter: blur(6px);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__text {
  position: relative;
  z-index: 1;
}

.page-about .about-hero h1 {
  margin: 0.5rem 0 1rem;
  font-size: clamp(1.95rem, 6.6vw, 4.4rem);
  font-weight: 800;
  line-height: 1.03;
  letter-spacing: -0.025em;
  max-width: 20ch;
}

.page-about .about-hero__lead {
  max-width: 56ch;
  margin: 0;
  font-size: clamp(0.95rem, 1.6vw, 1.1rem);
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-hero__jump {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-top: 1.4rem;
  padding-bottom: 0.15rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--pulse);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 214, 255, 0.4);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-hero__jump:hover,
.page-about .about-hero__jump:focus-visible {
  color: var(--neon);
  border-color: var(--neon);
}

.page-about .about-hero__media {
  position: relative;
  z-index: 1;
  margin-top: 2rem;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  border: 1px solid var(--line);
}

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

/* ---------- 起点 ---------- */
.page-about .about-origin {
  display: grid;
  gap: 1.5rem;
  padding-block: 3rem;
  border-top: 1px solid var(--line);
}

.page-about .about-origin__note {
  align-self: start;
  padding: 1.4rem 1.4rem 1.5rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background:
    linear-gradient(160deg, rgba(53, 214, 255, 0.12), rgba(23, 17, 40, 0.55));
}

.page-about .about-origin__label {
  margin: 0 0 0.85rem;
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--pulse);
}

.page-about .about-origin__note-text {
  margin: 0 0 0.85rem;
  font-size: 0.87rem;
  line-height: 1.68;
  color: var(--mist);
}

.page-about .about-origin__note-text:last-child {
  margin-bottom: 0;
}

/* ---------- 标题统一 ---------- */
.page-about .section__title {
  margin: 0.4rem 0 0.75rem;
  font-size: clamp(1.45rem, 3.6vw, 2.15rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.015em;
}

.page-about .section__lead {
  max-width: 60ch;
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  padding-block: 3rem;
  border-top: 1px solid var(--line);
}

.page-about .about-timeline__head {
  margin-bottom: 1.5rem;
}

.page-about .about-timeline__filter {
  margin-bottom: 0.5rem;
}

.page-about .about-timeline__body {
  display: grid;
  gap: 2rem;
  margin-top: 1.5rem;
}

.page-about .about-timeline__list {
  position: relative;
  margin: 0;
  padding: 0 0 0 3.25rem;
  list-style: none;
  display: grid;
  gap: 1.35rem;
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 1.15rem;
  top: 1.6rem;
  bottom: 1.6rem;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--pulse), var(--signal) 42%, var(--amber) 70%, var(--neon));
  opacity: 0.45;
}

.page-about .about-stage {
  position: relative;
  scroll-margin-top: 2rem;
}

.page-about .about-stage__node {
  position: absolute;
  left: -3.25rem;
  top: 0.1rem;
  display: grid;
  place-items: center;
  width: 2.4rem;
  height: 2.4rem;
  border-radius: var(--radius-pill);
  background: var(--slate);
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  z-index: 1;
}

.page-about .about-stage--schedule .about-stage__node {
  color: var(--pulse);
  border-color: rgba(53, 214, 255, 0.5);
  box-shadow: 0 0 0 4px rgba(53, 214, 255, 0.09);
}

.page-about .about-stage--dashboard .about-stage__node {
  color: var(--signal);
  border-color: rgba(255, 216, 77, 0.5);
  box-shadow: 0 0 0 4px rgba(255, 216, 77, 0.09);
}

.page-about .about-stage--draw .about-stage__node {
  color: var(--amber);
  border-color: rgba(255, 178, 62, 0.5);
  box-shadow: 0 0 0 4px rgba(255, 178, 62, 0.09);
}

.page-about .about-stage--revamp .about-stage__node {
  color: var(--neon);
  border-color: rgba(184, 255, 61, 0.5);
  box-shadow: 0 0 0 4px rgba(184, 255, 61, 0.09);
}

.page-about .about-stage__body {
  padding: 1.15rem 1.25rem 1.3rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: linear-gradient(160deg, var(--slate), rgba(23, 17, 40, 0.62));
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .about-stage:hover .about-stage__body,
.page-about .about-stage:focus-within .about-stage__body {
  border-color: rgba(53, 214, 255, 0.4);
  transform: translateY(-2px);
}

.page-about .about-stage__era {
  margin: 0 0 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .about-stage__title {
  margin: 0 0 0.55rem;
  font-size: 1.16rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .about-stage__copy {
  margin: 0 0 0.85rem;
  font-size: 0.91rem;
  line-height: 1.68;
  color: var(--mist);
}

.page-about .about-stage__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

/* ---------- 阶段索引 ---------- */
.page-about .about-index {
  align-self: start;
  padding: 1.15rem 1rem 1.15rem 1.4rem;
  border-left: 2px solid var(--line);
}

.page-about .about-index__label {
  margin: 0 0 0.75rem;
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-index__list {
  display: grid;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.6rem;
  font-size: 0.88rem;
  color: var(--mist);
  text-decoration: none;
  transition: color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-index__link .mono {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--pulse);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--ice);
  transform: translateX(3px);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 2rem;
  padding-block: 3rem;
  border-top: 1px solid var(--line);
}

.page-about .about-team__media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-card);
}

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

.page-about .about-team__lead {
  max-width: 54ch;
  margin: 0 0 1.5rem;
  font-size: 0.94rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-team__rows {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.3rem 0.85rem;
  padding: 0.95rem 0;
  border-top: 1px solid var(--line);
}

.page-about .about-team__name {
  flex: 1 1 auto;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ice);
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-size: 1.55rem;
  font-weight: 700;
  line-height: 1;
  color: var(--pulse);
}

.page-about .about-team__desc {
  flex-basis: 100%;
  font-size: 0.83rem;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 合作网络 ---------- */
.page-about .about-network {
  padding-block: 3rem;
  border-top: 1px solid var(--line);
}

.page-about .about-network__head {
  margin-bottom: 1.5rem;
}

.page-about .about-network__media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  margin-bottom: 1.5rem;
}

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

.page-about .about-network__grid {
  display: grid;
  gap: 1rem;
}

.page-about .about-partner {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--slate);
  overflow: hidden;
  transition: border-color 0.25s var(--ease);
}

.page-about .about-partner[open] {
  border-color: rgba(53, 214, 255, 0.35);
}

.page-about .about-partner__head {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.85rem;
  padding: 1.1rem 1.15rem;
  cursor: pointer;
  list-style: none;
}

.page-about .about-partner__head::-webkit-details-marker {
  display: none;
}

.page-about .about-partner__head::marker {
  content: "";
}

.page-about .about-partner__num {
  font-family: var(--font-mono);
  font-size: 1.7rem;
  font-weight: 700;
  line-height: 1;
  color: var(--pulse);
}

.page-about .about-partner--amber .about-partner__num {
  color: var(--amber);
}

.page-about .about-partner--neon .about-partner__num {
  color: var(--neon);
}

.page-about .about-partner__title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ice);
}

.page-about .about-partner__toggle {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  line-height: 1;
  color: var(--mist);
  transition: transform 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .about-partner[open] .about-partner__toggle {
  transform: rotate(45deg);
  color: var(--pulse);
}

.page-about .about-partner__copy {
  margin: 0;
  padding: 0 1.2rem 1.2rem;
  font-size: 0.87rem;
  line-height: 1.68;
  color: var(--mist);
}

/* ---------- 工作线 ---------- */
.page-about .about-principles {
  padding-block: 3rem;
  border-top: 1px solid var(--line);
}

.page-about .about-principles .section__head {
  margin-bottom: 1.5rem;
}

.page-about .about-principles__list {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--line);
}

.page-about .about-principle {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.15rem 1.1rem;
  padding: 1.25rem 1.25rem 1.35rem;
  background: var(--ink);
}

.page-about .about-principle__num {
  grid-row: span 2;
  align-self: start;
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--neon);
}

.page-about .about-principle__title {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .about-principle__copy {
  margin: 0.2rem 0 0;
  font-size: 0.88rem;
  line-height: 1.68;
  color: var(--mist);
}

/* ---------- 里程碑 ---------- */
.page-about .about-milestones {
  padding-block: 3rem;
  border-top: 1px solid var(--line);
}

.page-about .about-milestones .section__head {
  margin-bottom: 1.5rem;
}

.page-about .about-milestones__grid {
  display: grid;
  gap: 1rem;
}

.page-about .about-milestone {
  display: grid;
  gap: 0.5rem;
  align-content: start;
  min-height: 138px;
  padding: 1.3rem 1.35rem 1.4rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: linear-gradient(165deg, var(--slate), rgba(23, 17, 40, 0.55));
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .about-milestone:hover {
  border-color: rgba(53, 214, 255, 0.35);
  transform: translateY(-2px);
}

.page-about .about-milestone__num {
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1;
  color: var(--neon);
}

.page-about .about-milestone--b .about-milestone__num {
  color: var(--pulse);
}

.page-about .about-milestone--c .about-milestone__num {
  color: var(--signal);
}

.page-about .about-milestone--d .about-milestone__num {
  color: var(--amber);
}

.page-about .about-milestone__text {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .about-milestone--accent {
  border-color: rgba(184, 255, 61, 0.32);
  background:
    radial-gradient(circle at 88% 12%, rgba(184, 255, 61, 0.16), transparent 58%),
    linear-gradient(160deg, rgba(23, 17, 40, 0.9), var(--slate));
}

.page-about .about-milestone__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--neon);
}

.page-about .about-milestone__title {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--ice);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  display: grid;
  gap: 1.5rem;
  margin-top: 3rem;
  padding: 1.75rem 1.5rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background:
    radial-gradient(circle at 92% 18%, rgba(53, 214, 255, 0.18), transparent 55%),
    linear-gradient(150deg, rgba(184, 255, 61, 0.07), rgba(23, 17, 40, 0.72));
}

.page-about .about-next__lead {
  max-width: 52ch;
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-next__inline {
  color: var(--pulse);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 214, 255, 0.45);
}

.page-about .about-next__inline:hover,
.page-about .about-next__inline:focus-visible {
  color: var(--neon);
  border-color: var(--neon);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-network__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-origin {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 2.75rem;
    align-items: start;
  }

  .page-about .about-next {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: center;
    padding: 2.25rem 2.5rem;
  }

  .page-about .about-next__links {
    justify-content: flex-end;
  }
}

@media (min-width: 900px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.18fr);
    gap: 2.75rem;
    align-items: center;
  }

  .page-about .about-milestones__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-about .about-milestone--a {
    grid-column: span 5;
  }

  .page-about .about-milestone--b {
    grid-column: span 7;
  }

  .page-about .about-milestone--c {
    grid-column: span 7;
  }

  .page-about .about-milestone--d {
    grid-column: span 5;
  }

  .page-about .about-milestone--accent {
    grid-column: span 12;
  }
}

@media (min-width: 960px) {
  .page-about .about-timeline__body {
    grid-template-columns: minmax(0, 1fr) 218px;
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 2rem;
  }

  .page-about .about-timeline__list {
    gap: 1.6rem;
  }

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

  .page-about .about-principles {
    padding-block: 3.5rem;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero {
    padding-block: 1.5rem 4rem;
  }

  .page-about .about-hero__media {
    margin-top: 2.75rem;
  }
}
<<<END>>>