.page-about {
  --about-stage-01: #2F5D4E;
  --about-stage-02: #6E7A72;
  --about-stage-03: #B6FF3B;
  --about-stage-04: #B56A4A;
  --about-soft: rgba(232, 227, 214, .78);
  --about-faint: rgba(232, 227, 214, .62);
  color: var(--bone);
  background: var(--ink-900);
  overflow-x: clip;
}

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

.page-about .about-h2 {
  margin: 0 0 18px;
  font-family: var(--f-display);
  font-weight: 900;
  font-size: clamp(24px, 4.6vw, 44px);
  line-height: 1.14;
  letter-spacing: -.012em;
  color: var(--bone);
}

.page-about .label--rule {
  display: block;
  margin: 0 0 14px;
  color: var(--acid);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(24px, 5.4vw, 60px) var(--gutter) clamp(44px, 8vw, 96px);
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: -2;
  overflow: hidden;
}

.page-about .about-hero__bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .38;
  filter: saturate(.7) contrast(1.06);
}

.page-about .about-hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(90% 70% at 82% 4%, rgba(182, 255, 59, .16), transparent 60%),
    linear-gradient(185deg, rgba(11, 31, 26, .22) 0%, rgba(11, 31, 26, .84) 58%, var(--ink-900) 100%);
}

.page-about .about-hero__frame {
  position: relative;
  max-width: var(--shell);
  margin: 0 auto;
  padding: clamp(22px, 4.4vw, 56px);
  border: 1px solid var(--hairline);
  background: linear-gradient(158deg, var(--glass) 0%, rgba(30, 43, 39, .55) 48%, rgba(11, 31, 26, .7) 100%);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  inset: -1px -1px auto -1px;
  height: 9px;
  background-image: repeating-linear-gradient(90deg, var(--hairline-strong) 0 1px, transparent 1px 16px);
  opacity: .8;
  pointer-events: none;
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 72px;
  height: 2px;
  background: var(--acid);
  opacity: .7;
  pointer-events: none;
}

.page-about .about-hero__frame .breadcrumbs {
  margin: 0 0 clamp(20px, 4vw, 38px);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  color: var(--acid);
}

.page-about .about-hero__title {
  margin: 0 0 clamp(16px, 2.6vw, 26px);
  font-family: var(--f-display);
  font-weight: 900;
  font-size: clamp(30px, 7.2vw, 74px);
  line-height: 1.05;
  letter-spacing: -.02em;
  color: var(--bone);
  max-width: 22ch;
}

.page-about .about-hero__title br {
  display: none;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 56ch;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.88;
  color: var(--about-soft);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(24px, 4vw, 44px) 0 0;
  padding: clamp(16px, 3vw, 22px) 0 0;
  border-top: 1px solid var(--hairline);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 12px;
}

.page-about .about-hero__stats .stat {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.page-about .about-hero__stats .stat__k {
  font-size: 10.5px;
  letter-spacing: .18em;
  color: var(--stone);
  text-transform: uppercase;
}

.page-about .about-hero__stats .stat__v {
  font-family: var(--f-mono);
  font-size: clamp(20px, 3.4vw, 30px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--bone);
}

.page-about .about-hero__stats .stat__v--acid {
  color: var(--acid);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding: clamp(44px, 9vw, 104px) var(--gutter);
}

.page-about .about-inner {
  max-width: var(--shell);
  margin: 0 auto;
}

/* ---------- 起点与方向 ---------- */
.page-about .about-origin {
  border-top: 1px solid var(--hairline);
  background: linear-gradient(180deg, rgba(30, 43, 39, .6) 0%, transparent 72%);
}

.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 46px);
}

.page-about .about-origin__body p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.92;
  color: var(--about-soft);
}

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

.page-about .about-origin__note {
  padding: 6px 0 6px 16px;
  border-left: 2px solid var(--clay);
  max-width: 44ch;
}

.page-about .about-note__tag {
  margin: 0 0 6px;
  font-family: var(--f-mono);
  font-size: 10.5px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--clay);
}

.page-about .about-origin__note p:last-child {
  margin: 0;
  font-size: 13px;
  line-height: 1.82;
  color: var(--about-faint);
}

/* ---------- 阶段体系 ---------- */
.page-about .about-stages {
  border-top: 1px solid var(--hairline);
  background: var(--ink-950);
}

.page-about .about-stages__lede {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--about-soft);
}

.page-about .about-stage-chip {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 18px 0 0;
  padding: 7px 13px;
  border: 1px solid var(--hairline);
  font-size: 10.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--stone);
}

.page-about .about-stage-chip .mono {
  font-family: var(--f-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--acid);
}

.page-about .stage-track {
  list-style: none;
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .stage-node {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 12px 14px;
  border: 1px solid var(--hairline);
  border-left: 3px solid var(--moss);
  background: rgba(30, 43, 39, .7);
  color: var(--bone);
  text-decoration: none;
  transition: background .25s var(--ease), border-color .25s var(--ease), transform .25s var(--ease);
}

.page-about .stage-node[data-stage-link="02"] {
  border-left-color: var(--about-stage-02);
}

.page-about .stage-node[data-stage-link="03"] {
  border-left-color: var(--about-stage-03);
}

.page-about .stage-node[data-stage-link="04"] {
  border-left-color: var(--about-stage-04);
}

.page-about .stage-node:hover {
  background: rgba(47, 93, 78, .55);
  transform: translateY(-2px);
}

.page-about .stage-node:focus-visible {
  outline: 2px solid var(--acid);
  outline-offset: 3px;
  background: rgba(47, 93, 78, .55);
}

.page-about .stage-node[data-stage-active] {
  background: rgba(182, 255, 59, .1);
  border-left-color: var(--acid);
}

.page-about .stage-node__num {
  font-family: var(--f-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--acid);
}

.page-about .stage-node__name {
  font-family: var(--f-display);
  font-weight: 700;
  font-size: 15.5px;
  letter-spacing: .01em;
}

.page-about .stage-node[data-stage-active] .stage-node__name {
  color: var(--acid);
}

.page-about .stage-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2.6vw, 24px);
  margin-top: clamp(26px, 4.6vw, 46px);
}

.page-about .stage-block {
  padding: clamp(18px, 3vw, 28px);
  background: var(--panel);
  border: 1px solid var(--hairline);
  border-top: 2px solid var(--moss);
  scroll-margin-top: 96px;
}

.page-about .stage-block[data-stage-section="02"] {
  border-top-color: var(--about-stage-02);
}

.page-about .stage-block[data-stage-section="03"] {
  border-top-color: var(--about-stage-03);
}

.page-about .stage-block[data-stage-section="04"] {
  border-top-color: var(--about-stage-04);
}

.page-about .stage-block__num {
  margin: 0 0 10px;
  font-family: var(--f-mono);
  font-size: 10.5px;
  letter-spacing: .22em;
  color: var(--stone);
}

.page-about .stage-block__title {
  margin: 0 0 10px;
  font-family: var(--f-display);
  font-weight: 700;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.4;
  color: var(--bone);
}

.page-about .stage-block__text {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.88;
  color: var(--about-soft);
}

.page-about .stage-block__points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .stage-block__points li {
  position: relative;
  padding-left: 16px;
  font-size: 13px;
  line-height: 1.72;
  color: var(--about-faint);
}

.page-about .stage-block__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .66em;
  width: 7px;
  height: 1px;
  background: var(--acid);
}

/* ---------- 发展坐标 ---------- */
.page-about .about-chrono {
  border-top: 1px solid var(--hairline);
  background: linear-gradient(180deg, rgba(17, 22, 20, .92) 0%, transparent 82%);
}

.page-about .about-chrono__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 52px);
}

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--hairline);
  background: var(--panel);
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.85) contrast(1.04);
}

.page-about .about-figure figcaption {
  padding: 11px 14px;
  border-top: 1px solid var(--hairline);
  font-size: 12px;
  line-height: 1.75;
  letter-spacing: .04em;
  color: var(--stone);
}

.page-about .chrono {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .chrono::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--moss) 0%, var(--stone) 55%, rgba(232, 227, 214, .08) 100%);
}

.page-about .chrono__item {
  position: relative;
  padding: 0 0 clamp(22px, 3.4vw, 34px);
}

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

.page-about .chrono__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 4px;
  width: 11px;
  height: 11px;
  border: 1px solid var(--stone);
  background: var(--ink-950);
  transform: rotate(45deg);
  transition: background .25s var(--ease), border-color .25s var(--ease);
}

.page-about .chrono__item:hover::before,
.page-about .chrono__item:focus-within::before {
  background: var(--acid);
  border-color: var(--acid);
}

.page-about .chrono__year {
  display: block;
  margin-bottom: 6px;
  font-family: var(--f-mono);
  font-size: 12.5px;
  letter-spacing: .16em;
  color: var(--acid);
}

.page-about .chrono__title {
  margin: 0 0 6px;
  font-family: var(--f-display);
  font-weight: 700;
  font-size: 16.5px;
  line-height: 1.45;
  color: var(--bone);
}

.page-about .chrono__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.82;
  color: var(--about-faint);
  max-width: 52ch;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  border-top: 1px solid var(--hairline);
  background: linear-gradient(180deg, rgba(47, 93, 78, .26) 0%, transparent 68%);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-team__lede {
  margin: 0 0 clamp(20px, 3vw, 28px);
  max-width: 44ch;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--about-soft);
}

.page-about .team-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .team-card {
  padding: 18px;
  background: rgba(30, 43, 39, .84);
  border: 1px solid var(--hairline);
  transition: border-color .25s var(--ease), background .25s var(--ease), transform .25s var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within,
.page-about .team-card:focus {
  border-color: rgba(182, 255, 59, .45);
  background: rgba(30, 43, 39, 1);
  transform: translateY(-2px);
}

.page-about .team-card:focus-visible {
  outline: 2px solid var(--acid);
  outline-offset: 3px;
}

.page-about .team-card__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.page-about .team-card__num {
  font-family: var(--f-mono);
  font-size: clamp(24px, 4vw, 33px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--acid);
}

.page-about .team-card__unit {
  font-size: 10.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--stone);
  text-align: right;
}

.page-about .team-card__name {
  margin: 0 0 8px;
  font-family: var(--f-display);
  font-weight: 700;
  font-size: 16.5px;
  line-height: 1.45;
  color: var(--bone);
}

.page-about .team-card__duty {
  margin: 0;
  font-size: 13px;
  line-height: 1.78;
  color: var(--about-faint);
}

.page-about .team-card__more {
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 12.5px;
  line-height: 1.78;
  color: var(--acid);
  transition: max-height .34s var(--ease), opacity .28s var(--ease), margin .3s var(--ease);
}

.page-about .team-card:hover .team-card__more,
.page-about .team-card:focus .team-card__more,
.page-about .team-card:focus-within .team-card__more {
  max-height: 160px;
  opacity: 1;
  margin-top: 12px;
}

/* ---------- 质量与节奏 ---------- */
.page-about .about-quality {
  border-top: 1px solid var(--hairline);
  background: var(--ink-950);
}

.page-about .about-quality__lede {
  margin: 0;
  max-width: 56ch;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--about-soft);
}

.page-about .quality-flow {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}

.page-about .quality-step {
  padding: clamp(18px, 3vw, 28px);
  background: var(--ink-950);
}

.page-about .quality-step__idx {
  display: block;
  margin-bottom: 10px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--clay);
}

.page-about .quality-step__title {
  margin: 0 0 8px;
  font-family: var(--f-display);
  font-weight: 700;
  font-size: 16.5px;
  color: var(--bone);
}

.page-about .quality-step__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.82;
  color: var(--about-faint);
}

.page-about .cadence {
  margin-top: clamp(18px, 3vw, 30px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .cadence__item {
  padding: 15px 17px;
  border-left: 2px solid var(--moss);
  background: rgba(30, 43, 39, .62);
}

.page-about .cadence__k {
  display: block;
  margin-bottom: 7px;
  font-size: 10.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--stone);
}

.page-about .cadence__v {
  margin: 0;
  font-family: var(--f-mono);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--bone);
}

/* ---------- 回访与协作 ---------- */
.page-about .about-return {
  border-top: 1px solid var(--hairline);
  background:
    radial-gradient(85% 65% at 12% 0%, rgba(182, 255, 59, .08), transparent 62%),
    linear-gradient(180deg, rgba(30, 43, 39, .55) 0%, transparent 78%);
}

.page-about .about-return__lede {
  margin: 0;
  max-width: 56ch;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--about-soft);
}

.page-about .return-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: clamp(22px, 3.4vw, 34px);
}

.page-about .return-card {
  padding: 16px;
  background: var(--glass);
  border: 1px solid var(--hairline);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.page-about .return-card__num {
  margin: 0 0 8px;
  font-family: var(--f-mono);
  font-size: clamp(21px, 3.4vw, 32px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--bone);
}

.page-about .return-card__label {
  margin: 0;
  font-size: 11.5px;
  line-height: 1.62;
  letter-spacing: .05em;
  color: var(--stone);
}

.page-about .partner {
  margin-top: clamp(26px, 4.4vw, 44px);
  padding-top: clamp(20px, 3vw, 30px);
  border-top: 1px solid var(--hairline);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 32px);
}

.page-about .partner__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.92;
  color: var(--about-soft);
  max-width: 58ch;
}

.page-about .partner__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .partner__list li {
  position: relative;
  padding-left: 18px;
  font-size: 13px;
  line-height: 1.78;
  color: var(--about-faint);
}

.page-about .partner__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 8px;
  height: 8px;
  border: 1px solid var(--clay);
  transform: rotate(45deg);
}

/* ---------- 行动区 ---------- */
.page-about .about-next {
  border-top: 1px solid var(--hairline);
}

.page-about .about-next__inner {
  padding: clamp(26px, 5vw, 52px);
  border: 1px solid var(--hairline);
  background: linear-gradient(140deg, rgba(47, 93, 78, .45) 0%, rgba(17, 22, 20, .94) 72%);
}

.page-about .about-next__inner .about-h2 {
  margin-bottom: 12px;
}

.page-about .about-next__text {
  margin: 0 0 clamp(18px, 3vw, 26px);
  max-width: 54ch;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--about-soft);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 640px) {
  .page-about .about-hero__title br {
    display: inline;
  }
}

@media (min-width: 760px) {
  .page-about .stage-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .partner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr);
    align-items: start;
    column-gap: clamp(32px, 5vw, 72px);
  }

  .page-about .about-origin__head {
    position: sticky;
    top: 96px;
  }

  .page-about .about-origin__note {
    grid-column: 2;
  }

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

  .page-about .about-chrono__grid {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, .86fr) minmax(0, 1.14fr);
    align-items: start;
    column-gap: clamp(32px, 4.6vw, 64px);
  }

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

@media (min-width: 1200px) {
  .page-about .about-hero__frame {
    padding: clamp(40px, 4vw, 64px);
  }

  .page-about .stage-block__text {
    font-size: 15px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .stage-node,
  .page-about .team-card,
  .page-about .chrono__item::before,
  .page-about .team-card__more {
    transition: none;
  }

  .page-about .stage-node:hover,
  .page-about .team-card:hover,
  .page-about .team-card:focus {
    transform: none;
  }
}
<<<END>>>