.page-about .crumbs {
  margin-top: 18px;
}

/* ---------- 首屏 ---------- */
.page-about .hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  padding-block: clamp(26px, 4vw, 52px) clamp(44px, 6vw, 88px);
  align-items: end;
}

.page-about .hero__kicker {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .hero h1 {
  margin: 0 0 20px;
  font-size: clamp(34px, 6.4vw, 70px);
  line-height: 1.04;
  font-weight: 900;
  letter-spacing: -.02em;
  color: var(--title);
}

.page-about .hero .lead {
  margin: 0;
  max-width: 40ch;
  color: var(--body);
  line-height: 1.9;
}

.page-about .hero__facts {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 10px 34px;
}

.page-about .hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .hero__facts .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 24px;
  color: var(--cyan);
  letter-spacing: -.01em;
}

.page-about .hero__facts small {
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--dim);
}

.page-about .hero__figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  overflow: hidden;
  background: var(--ink-2);
}

.page-about .hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 9 / 4;
  object-fit: cover;
  filter: saturate(.72) brightness(.86) contrast(1.04);
}

.page-about .hero__figure .media__tag {
  position: absolute;
  left: 14px;
  bottom: 12px;
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--cyan);
  background: rgba(5, 19, 15, .62);
  border: 1px solid var(--line);
  padding: 4px 9px;
}

@media (min-width: 900px) {
  .page-about .hero {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: clamp(32px, 4.6vw, 68px);
  }
}

/* ---------- 章节骨架 ---------- */
.page-about .section {
  padding-block: clamp(44px, 6.4vw, 92px);
}

.page-about .section__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: start;
  gap: 10px 22px;
  margin-bottom: clamp(26px, 4vw, 52px);
}

.page-about .section__head h2 {
  grid-column: 2;
  margin: 0;
  font-size: clamp(26px, 3.9vw, 46px);
  line-height: 1.14;
  font-weight: 800;
  letter-spacing: -.015em;
  color: var(--title);
}

.page-about .section__head .section__lead {
  grid-column: 2;
  margin: 0;
  max-width: 44ch;
  color: var(--body);
  line-height: 1.9;
}

/* ---------- 01 起点 ---------- */
.page-about .why {
  border-top: 1px solid var(--line);
}

.page-about .why__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 20px;
  padding: clamp(20px, 3vw, 32px) 0;
  border-bottom: 1px solid var(--line);
  position: relative;
  transition: background-color .24s var(--ease-hard);
}

.page-about .why__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: clamp(20px, 3vw, 32px);
  width: 2px;
  height: 22px;
  background: var(--cyan);
  opacity: .55;
}

.page-about .why__item:hover::before {
  opacity: 1;
}

.page-about .why__no {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--cyan);
  padding-top: 4px;
}

.page-about .why__item h3 {
  margin: 0;
  font-size: clamp(18px, 2.1vw, 23px);
  font-weight: 700;
  color: var(--title);
}

.page-about .why__item p {
  grid-column: 2;
  margin: 0;
  max-width: 52ch;
  color: var(--body);
  line-height: 1.95;
}

@media (min-width: 820px) {
  .page-about .why__item {
    grid-template-columns: 56px minmax(0, 1fr) minmax(0, 1.35fr);
    padding-inline-start: 20px;
  }
  .page-about .why__item p {
    grid-column: 3;
    grid-row: 1;
  }
  .page-about .why__item h3 {
    grid-column: 2;
  }
}

/* ---------- 02 时间轴 ---------- */
.page-about .stage__track-wrap {
  margin-bottom: clamp(26px, 4vw, 42px);
}

.page-about .stage-track {
  display: block;
  width: 100%;
  height: auto;
  max-height: 190px;
}

.page-about .stage-track__rail {
  stroke: var(--line);
  stroke-width: 1;
}

.page-about .stage-track__live {
  stroke: var(--cyan);
  stroke-width: 1;
  opacity: .38;
}

.page-about .stage-track__node circle {
  fill: var(--ink);
  stroke: var(--line);
  stroke-width: 1.5;
  transition: fill .22s var(--ease-hard), stroke .22s var(--ease-hard), r .22s var(--ease-hard);
}

.page-about .stage-track__node:hover circle {
  fill: var(--cyan);
  stroke: var(--cyan);
}

.page-about .stage-track__no {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: .12em;
  fill: var(--cyan);
}

.page-about .stage-track__label {
  font-family: var(--font-sans);
  font-size: 16px;
  fill: var(--dim);
  transition: fill .22s var(--ease-hard);
}

.page-about .stage-track__node:hover .stage-track__label {
  fill: var(--title);
}

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

.page-about .stage-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 8px 22px;
  padding: clamp(20px, 3vw, 30px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .stage-item__no {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1;
  color: var(--cyan);
  opacity: .82;
}

.page-about .stage-item__body h3 {
  margin: 0 0 8px;
  font-size: clamp(18px, 2.2vw, 24px);
  font-weight: 700;
  color: var(--title);
}

.page-about .stage-item__body p {
  margin: 0;
  max-width: 56ch;
  color: var(--body);
  line-height: 1.95;
}

.page-about .stage-item .tag {
  grid-column: 2;
  justify-self: start;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
}

@media (min-width: 860px) {
  .page-about .stage-item {
    grid-template-columns: 86px minmax(0, 1fr) 190px;
    align-items: start;
  }
  .page-about .stage-item .tag {
    grid-column: 3;
    margin-top: 6px;
    justify-self: end;
  }
}

@media (max-width: 719px) {
  .page-about .stage__track-wrap {
    display: none;
  }
}

/* ---------- 03 岗位 ---------- */
.page-about .roles {
  position: relative;
}

.page-about .roles__rail {
  display: flex;
  gap: 0;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x mandatory;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}

.page-about .roles__rail:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .role {
  flex: 0 0 min(282px, 78vw);
  scroll-snap-align: start;
  padding: clamp(20px, 3vw, 30px) clamp(18px, 2.4vw, 26px);
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: linear-gradient(180deg, rgba(18, 48, 40, .55), rgba(10, 31, 25, .1));
}

.page-about .role:last-child {
  border-right: 0;
}

.page-about .role__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--cyan);
}

.page-about .role h3 {
  margin: 0;
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 700;
  color: var(--title);
}

.page-about .role p {
  margin: 0;
  color: var(--body);
  line-height: 1.9;
  font-size: 15px;
}

.page-about .role__note {
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--dim);
  letter-spacing: .04em;
}

.page-about .roles__hint {
  margin: 10px 0 0;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--dim);
}

.page-about .team-figure {
  margin: clamp(28px, 4vw, 46px) 0 0;
  position: relative;
  border: 1px solid var(--line);
  overflow: hidden;
  background: var(--ink-2);
}

.page-about .team-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 3;
  object-fit: cover;
  filter: saturate(.68) brightness(.84);
}

.page-about .team-figure .media__tag {
  position: absolute;
  right: 14px;
  bottom: 12px;
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--cyan);
  background: rgba(5, 19, 15, .62);
  border: 1px solid var(--line);
  padding: 4px 9px;
}

@media (min-width: 960px) {
  .page-about .roles__hint {
    display: none;
  }
}

/* ---------- 04 环节 ---------- */
.page-about .pipeline {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

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

.page-about .pipe__step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 20px;
  padding: clamp(18px, 2.6vw, 26px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .pipe__no {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1.05;
  color: var(--cyan);
  opacity: .85;
}

.page-about .pipe__step h3 {
  margin: 0;
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 700;
  color: var(--title);
}

.page-about .pipe__step p {
  grid-column: 2;
  margin: 0;
  max-width: 56ch;
  color: var(--body);
  line-height: 1.95;
}

.page-about .pipe-figure {
  margin: 0;
  position: relative;
  border: 1px solid var(--line);
  overflow: hidden;
  background: var(--ink-2);
}

.page-about .pipe-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 6;
  object-fit: cover;
  filter: saturate(.62) brightness(.82);
}

.page-about .pipe-figure .media__tag {
  position: absolute;
  left: 14px;
  bottom: 12px;
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--cyan);
  background: rgba(5, 19, 15, .62);
  border: 1px solid var(--line);
  padding: 4px 9px;
}

@media (min-width: 940px) {
  .page-about .pipeline {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(36px, 5vw, 72px);
  }
}

/* ---------- 05 三端 ---------- */
.page-about .tri {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .tri__col {
  background: var(--ink-2);
  padding: clamp(20px, 3vw, 32px);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .tri__col--focus {
  background: var(--card);
}

.page-about .tri__badge {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
  align-self: flex-start;
  padding: 4px 9px;
  background: rgba(33, 243, 200, .08);
}

.page-about .tri__col--focus .tri__badge {
  color: var(--orange);
  background: rgba(255, 138, 43, .08);
}

.page-about .tri__col h3 {
  margin: 0;
  font-size: clamp(20px, 2.3vw, 26px);
  font-weight: 800;
  color: var(--title);
}

.page-about .tri__scene {
  margin: 0;
  font-size: 14.5px;
  color: var(--dim);
  line-height: 1.8;
}

.page-about .tri__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 9px;
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.page-about .tri__list li {
  position: relative;
  padding-left: 16px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--body);
}

.page-about .tri__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 7px;
  height: 1px;
  background: var(--cyan);
}

.page-about .tri__col--focus .tri__list li::before {
  background: var(--orange);
}

.page-about .tri__link {
  margin-top: auto;
  align-self: flex-start;
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(33, 243, 200, .4);
  padding-bottom: 2px;
}

.page-about .tri__link:hover {
  border-bottom-color: var(--cyan);
}

@media (min-width: 840px) {
  .page-about .tri {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 06 运营标准 ---------- */
.page-about .stds {
  border-top: 1px solid var(--line);
}

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

.page-about .stds__head {
  width: 100%;
  display: flex;
  align-items: baseline;
  gap: 18px;
  padding: clamp(16px, 2.4vw, 22px) 0;
  background: none;
  border: 0;
  color: var(--title);
  text-align: left;
  font: inherit;
  cursor: pointer;
}

.page-about .stds__head:hover .stds__title {
  color: var(--cyan);
}

.page-about .stds__no {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .18em;
  color: var(--cyan);
  flex: 0 0 auto;
  padding-top: 4px;
}

.page-about .stds__title {
  font-size: clamp(16px, 2vw, 20px);
  font-weight: 700;
  line-height: 1.5;
  transition: color .22s var(--ease-hard);
}

.page-about .stds__body {
  padding: 0 0 clamp(18px, 2.6vw, 26px);
}

.page-about .stds__body p {
  margin: 0;
  max-width: 58ch;
  color: var(--body);
  line-height: 1.95;
  padding-left: 0;
}

.page-about .stds__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(33, 243, 200, .35);
}

.page-about .stds__body a:hover {
  border-bottom-color: var(--cyan);
}

@media (min-width: 780px) {
  .page-about .stds__body p {
    padding-left: 62px;
  }
}

/* ---------- 收尾 ---------- */
.page-about .about-cta-section {
  padding-block: clamp(40px, 5.4vw, 76px);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(18px, 3vw, 36px);
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--line);
  padding-top: clamp(26px, 3.6vw, 44px);
}

.page-about .about-cta__text h2 {
  margin: 0 0 8px;
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--title);
}

.page-about .about-cta__text p {
  margin: 0;
  max-width: 40ch;
  color: var(--dim);
  line-height: 1.85;
  font-size: 15px;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta__actions .btn {
  font-size: 14px;
}
<<<END>>>