.page-about {
  --about-cut: 14px;
  --about-line: rgba(127, 243, 236, 0.16);
  --about-line-soft: rgba(92, 110, 126, 0.28);
  position: relative;
  overflow-x: clip;
  background: var(--space-900);
  color: var(--ceramic);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(1.4rem, 4vw, 2.4rem) 0 clamp(2.6rem, 6vw, 4.4rem);
  background:
    radial-gradient(880px 420px at 84% 6%, rgba(37, 224, 212, 0.15), rgba(8, 19, 31, 0) 66%),
    radial-gradient(640px 380px at 2% 92%, rgba(245, 178, 60, 0.08), rgba(8, 19, 31, 0) 70%),
    linear-gradient(180deg, var(--space-800), var(--space-900));
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(1.4rem, 4vw, 2.4rem);
}

.page-about .about-hero__split {
  align-items: end;
  gap: clamp(1.8rem, 4vw, 3rem);
}

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

.page-about .about-hero h1 {
  margin: 0.55rem 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.95rem, 6.4vw, 3.9rem);
  line-height: 1.1;
  letter-spacing: -0.005em;
  max-width: 22ch;
  color: var(--ceramic);
}

.page-about .about-hero .lede {
  max-width: 56ch;
  margin: 0;
  font-size: clamp(0.96rem, 2.2vw, 1.06rem);
  line-height: 1.85;
  color: rgba(237, 243, 247, 0.84);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem 1.1rem;
  margin: clamp(1.5rem, 4vw, 2.2rem) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stat {
  position: relative;
  padding-left: 0.95rem;
  min-width: 0;
}

.page-about .about-stat::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.2rem;
  bottom: 0.25rem;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), rgba(37, 224, 212, 0));
}

.page-about .about-stat--amber::before {
  background: linear-gradient(180deg, var(--amber), rgba(245, 178, 60, 0));
}

.page-about .about-stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 4.2vw, 1.85rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan-soft);
}

.page-about .about-stat--amber .about-stat__value {
  color: var(--amber);
}

.page-about .about-stat__plus {
  font-size: 0.7em;
  vertical-align: super;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--slate);
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  border: 1px solid var(--about-line);
  background: linear-gradient(140deg, rgba(37, 224, 212, 0.1), rgba(245, 178, 60, 0.05));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

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

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  position: relative;
  padding: clamp(3rem, 6.5vw, 5.5rem) 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-section--alt {
  background: linear-gradient(180deg, rgba(15, 33, 51, 0.62), rgba(8, 19, 31, 0));
}

.page-about .about-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 0.9rem;
  row-gap: 0.4rem;
  align-items: start;
  margin-bottom: clamp(1.7rem, 4vw, 2.8rem);
  padding-bottom: 1rem;
  border-bottom: 1px dashed var(--about-line-soft);
}

.page-about .about-head__num {
  grid-column: 1;
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  color: var(--amber);
  padding-top: 0.4rem;
}

.page-about .about-head__title {
  grid-column: 2;
  grid-row: 1;
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3.6vw, 2.25rem);
  line-height: 1.18;
  letter-spacing: -0.005em;
  color: var(--ceramic);
}

.page-about .about-head__note {
  grid-column: 2;
  grid-row: 2;
  margin: 0;
  max-width: 66ch;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 起点与双线 ---------- */
.page-about .about-start {
  align-items: start;
  gap: clamp(1.6rem, 4vw, 3rem);
}

.page-about .about-start__copy {
  min-width: 0;
  color: rgba(237, 243, 247, 0.86);
}

.page-about .about-start__media {
  margin: 0;
  border: 1px solid var(--about-line);
  background: linear-gradient(160deg, rgba(37, 224, 212, 0.08), rgba(245, 178, 60, 0.04));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

/* ---------- 时间轴 ---------- */
.page-about .about-tl {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--moss) 48%, var(--amber) 100%);
  opacity: 0.5;
}

.page-about .about-node {
  position: relative;
  padding-left: 32px;
  padding-bottom: clamp(2rem, 5vw, 3rem);
}

.page-about .about-node:last-child {
  padding-bottom: 0;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55rem;
  width: 13px;
  height: 13px;
  background: var(--space-900);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(37, 224, 212, 0.08), 0 0 12px rgba(37, 224, 212, 0.35);
  transform: rotate(45deg);
}

.page-about .about-node--now::before {
  border-color: var(--amber);
  background: rgba(245, 178, 60, 0.16);
  box-shadow: 0 0 0 4px rgba(245, 178, 60, 0.12), 0 0 14px rgba(245, 178, 60, 0.42);
}

.page-about .about-node__year {
  display: inline-block;
  margin-bottom: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  letter-spacing: 0.1em;
  color: var(--amber);
}

.page-about .about-node__box {
  position: relative;
  padding: clamp(1.05rem, 3vw, 1.55rem);
  border: 1px solid var(--about-line);
  background: linear-gradient(150deg, rgba(15, 33, 51, 0.92), rgba(8, 19, 31, 0.72));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-node--now .about-node__box {
  border-color: rgba(245, 178, 60, 0.32);
  background: linear-gradient(150deg, rgba(31, 42, 34, 0.9), rgba(8, 19, 31, 0.78));
}

.page-about .about-node__badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0 0 0.7rem;
  padding: 0;
  list-style: none;
}

.page-about .about-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  padding: 0.22rem 0.55rem;
  color: var(--cyan-soft);
  border: 1px solid rgba(37, 224, 212, 0.3);
  background: rgba(37, 224, 212, 0.07);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 7px), calc(100% - 7px) 100%, 0 100%);
}

.page-about .about-badge--amber {
  color: var(--amber);
  border-color: rgba(245, 178, 60, 0.36);
  background: rgba(245, 178, 60, 0.09);
}

.page-about .about-node__title {
  margin: 0 0 0.5rem;
  font-family: var(--font-heading);
  font-size: 1.06rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ceramic);
}

.page-about .about-node__text {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.78;
  color: rgba(237, 243, 247, 0.76);
}

/* ---------- 团队与流程 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-bottom: clamp(1.8rem, 4vw, 2.6rem);
  border: 1px solid var(--about-line);
  background: var(--about-line);
}

.page-about .about-team__item {
  position: relative;
  padding: clamp(1.1rem, 3vw, 1.6rem);
  background: linear-gradient(160deg, rgba(15, 33, 51, 0.92), rgba(8, 19, 31, 0.86));
  overflow: hidden;
}

.page-about .about-team__item::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  width: 30px;
  height: 2px;
  background: linear-gradient(90deg, rgba(37, 224, 212, 0), var(--cyan));
  opacity: 0.65;
}

.page-about .about-team__num {
  display: block;
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .about-team__title {
  margin: 0 0 0.5rem;
  font-family: var(--font-heading);
  font-size: 1.04rem;
  font-weight: 700;
  color: var(--ceramic);
}

.page-about .about-team__text {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--slate);
}

.page-about .about-team__lower {
  align-items: start;
  gap: clamp(1.6rem, 4vw, 2.8rem);
}

.page-about .about-team__media {
  margin: 0;
  border: 1px solid var(--about-line);
  background: linear-gradient(160deg, rgba(37, 224, 212, 0.08), rgba(62, 142, 126, 0.06));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

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

.page-about .about-faq__heading {
  margin: 0 0 0.9rem;
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ceramic);
}

.page-about .about-faq__acc {
  border-top: 1px solid var(--about-line);
}

.page-about .about-faq__item {
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-faq__trigger {
  position: relative;
  width: 100%;
  padding: 0.95rem 2.2rem 0.95rem 0;
  border: 0;
  background: transparent;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1.6;
  text-align: left;
  color: var(--ceramic);
  cursor: pointer;
  transition: color var(--speed) var(--ease);
}

.page-about .about-faq__trigger::after {
  content: "+";
  position: absolute;
  right: 0.15rem;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 1.1rem;
  line-height: 1;
  color: var(--amber);
}

.page-about .about-faq__trigger:hover {
  color: var(--cyan-soft);
}

.page-about .about-faq__panel {
  padding: 0 0 1rem;
}

.page-about .about-faq__panel p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--slate);
}

/* ---------- 沉淀清单 ---------- */
.page-about .about-legacy {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-line);
}

.page-about .about-legacy__row {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 0 0.9rem;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--about-line);
  transition: background var(--speed) var(--ease);
}

.page-about .about-legacy__row:hover {
  background: linear-gradient(90deg, rgba(37, 224, 212, 0.07), rgba(37, 224, 212, 0));
}

.page-about .about-legacy__num {
  padding-top: 0.2rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  color: var(--amber);
}

.page-about .about-legacy__row h3 {
  margin: 0 0 0.4rem;
  font-family: var(--font-heading);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--ceramic);
}

.page-about .about-legacy__row p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--slate);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.page-about .about-next__card {
  position: relative;
  padding: clamp(1.15rem, 3vw, 1.7rem);
  border: 1px solid var(--about-line);
  background: linear-gradient(150deg, rgba(15, 33, 51, 0.9), rgba(8, 19, 31, 0.6));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-next__title {
  margin: 0 0 0.55rem;
  font-family: var(--font-heading);
  font-size: 1.06rem;
  font-weight: 700;
  color: var(--ceramic);
}

.page-about .about-next__card p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--slate);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: clamp(1.7rem, 4vw, 2.4rem);
  padding-top: clamp(1.2rem, 3vw, 1.8rem);
  border-top: 1px dashed var(--about-line-soft);
}

/* ---------- 侧边索引 ---------- */
.page-about .side-rail {
  display: none;
}

.page-about .side-rail__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 1px solid var(--about-line);
}

.page-about .side-rail__link {
  position: relative;
  display: block;
  padding: 0.5rem 0.6rem 0.5rem 0.9rem;
  font-size: 0.76rem;
  line-height: 1.5;
  color: var(--slate);
  text-decoration: none;
  transition: color var(--speed) var(--ease);
}

.page-about .side-rail__link::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 50%;
  width: 2px;
  height: 0;
  background: var(--cyan);
  transform: translateY(-50%);
  transition: height var(--speed) var(--ease);
}

.page-about .side-rail__link:hover,
.page-about .side-rail__link[aria-current="true"],
.page-about .side-rail__link[aria-current="location"] {
  color: var(--cyan-soft);
}

.page-about .side-rail__link:hover::before,
.page-about .side-rail__link[aria-current="true"]::before,
.page-about .side-rail__link[aria-current="location"]::before {
  height: 70%;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-about .about-next__card:first-child {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-about .about-tl::before {
    left: 47px;
  }

  .page-about .about-node {
    display: grid;
    grid-template-columns: 100px minmax(0, 1fr);
    column-gap: 2rem;
    padding-left: 80px;
  }

  .page-about .about-node::before {
    left: 41px;
    top: 0.7rem;
  }

  .page-about .about-node__year {
    position: sticky;
    top: 104px;
    align-self: start;
    margin-bottom: 0;
    font-size: 1rem;
    text-align: left;
  }
}

@media (min-width: 1000px) {
  .page-about .about-hero__split {
    align-items: end;
  }
}

@media (min-width: 1680px) {
  .page-about .side-rail {
    display: block;
    position: fixed;
    left: calc((100vw - var(--shell)) / 2 - 156px);
    top: 50%;
    width: 140px;
    transform: translateY(-50%);
    z-index: 20;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node__year {
    position: static;
  }
}
</PAGE_CSS>>>