.page-about {
  --about-path: var(--c-jade);
  --about-path-soft: var(--c-jade-soft);
  --about-hair: rgba(27, 25, 23, .12);
}

/* ---------- 面包屑行 ---------- */
.page-about .about-crumb-row {
  padding-block: 26px 4px;
}
.page-about .about-crumb-row .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

/* ---------- 主张首屏 ---------- */
.page-about .about-lead {
  padding-block: clamp(18px, 4vw, 54px) clamp(52px, 8vw, 100px);
  position: relative;
  overflow: hidden;
}
.page-about .about-lead::after {
  content: "";
  position: absolute;
  right: -40px;
  top: 12%;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  border: 1px solid var(--about-hair);
  pointer-events: none;
  z-index: -1;
}
.page-about .about-lead__inner {
  max-width: 100%;
}
.page-about .about-lead__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.35rem, 6.4vw, 4.6rem);
  line-height: 1.06;
  letter-spacing: -.012em;
  color: var(--c-ink);
  margin: 16px 0 26px;
  max-width: 16em;
}
.page-about .about-lead__title::after {
  content: "";
  display: block;
  width: 88px;
  height: 6px;
  margin-top: 26px;
  background: linear-gradient(90deg, var(--c-gold) 0%, var(--c-gold) 62%, var(--c-red) 62%, var(--c-red) 100%);
  transform: skewX(-12deg);
}
.page-about .about-lead__lede {
  font-size: 17px;
  line-height: 1.85;
  color: var(--c-stone);
  max-width: 34em;
  margin: 0 0 34px;
}
.page-about .about-lead__facts {
  list-style: none;
  margin: 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--about-hair);
  display: grid;
  gap: 18px;
}
.page-about .about-lead__facts li {
  display: flex;
  align-items: baseline;
  gap: 14px;
}
.page-about .about-lead__fact-num {
  font-size: 20px;
  font-weight: 700;
  color: var(--c-red);
  letter-spacing: .02em;
  min-width: 4.6em;
}
.page-about .about-lead__fact-label {
  font-size: 15px;
  color: var(--c-stone);
  line-height: 1.55;
}

/* ---------- 主张由来 ---------- */
.page-about .about-claim__inner {
  display: grid;
  gap: 34px;
}
.page-about .about-claim__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.55rem, 3.6vw, 2.35rem);
  line-height: 1.22;
  color: var(--c-ink);
  margin: 14px 0 22px;
}
.page-about .about-claim__copy p {
  font-size: 17px;
  line-height: 1.85;
  color: var(--c-stone);
  max-width: 33em;
  margin: 0 0 16px;
}
.page-about .about-claim__copy p:last-child {
  margin-bottom: 0;
}
.page-about .about-claim__frame {
  position: relative;
}
.page-about .about-claim__frame::before {
  content: "";
  position: absolute;
  inset: 0;
  transform: translate(-10px, 10px);
  border: 1px solid var(--c-gold-soft);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
  pointer-events: none;
  z-index: -1;
}
.page-about .about-claim__caption,
.page-about .about-team__caption,
.page-about .about-timeline__caption {
  display: block;
  margin-top: 12px;
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--c-stone);
  text-transform: uppercase;
}

/* ---------- 一步的定义 ---------- */
.page-about .about-step {
  padding-left: 0;
}
.page-about .about-step__inner {
  border-left: 3px solid var(--c-jade);
  padding-left: clamp(18px, 4vw, 40px);
}
.page-about .about-step__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  line-height: 1.24;
  color: var(--c-ink);
  margin: 12px 0 24px;
}
.page-about .about-step__def {
  background: var(--c-paper-2);
  padding: clamp(18px, 3.4vw, 30px);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% 100%, 0 100%, 0 var(--cut));
  margin-bottom: 24px;
}
.page-about .about-step__formula {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  font-size: 17px;
  line-height: 1.7;
  color: var(--c-ink);
}
.page-about .about-step__formula-key {
  color: var(--c-red);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: .08em;
}
.page-about .about-step__formula-eq {
  color: var(--c-gold);
  font-weight: 700;
}
.page-about .about-step__notes p {
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--c-stone);
  max-width: 34em;
  margin: 0 0 14px;
}
.page-about .about-step__notes p:last-child {
  margin-bottom: 0;
}

/* ---------- 团队 ---------- */
.page-about .about-team__figure {
  margin: 0 0 42px;
}
.page-about .about-team__head h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.55rem, 3.8vw, 2.4rem);
  line-height: 1.22;
  color: var(--c-ink);
  margin: 14px 0 16px;
}
.page-about .about-team__lede {
  font-size: 17px;
  line-height: 1.85;
  color: var(--c-stone);
  max-width: 34em;
  margin: 0 0 36px;
}
.page-about .about-team__panels {
  display: grid;
  gap: 22px;
}
.page-about .about-team__card {
  position: relative;
  padding: 26px 24px 24px;
  overflow: hidden;
}
.page-about .about-team__card::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 3px;
  background: var(--c-jade-soft);
  transform: scaleX(.28);
  transform-origin: left;
  transition: transform .42s var(--ease), background-color .42s var(--ease);
}
.page-about .about-team__card:hover::after,
.page-about .about-team__card:focus-within::after {
  transform: scaleX(1);
  background: var(--c-jade);
}
.page-about .about-team__num {
  display: block;
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-gold);
  letter-spacing: .02em;
}
.page-about .about-team__card-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 21px;
  color: var(--c-ink);
  margin: 12px 0 10px;
}
.page-about .about-team__role {
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--c-stone);
  margin: 0 0 16px;
}
.page-about .about-team__tasks {
  list-style: none;
  margin: 0;
  padding: 14px 0 0;
  border-top: 1px dashed var(--about-hair);
}
.page-about .about-team__tasks li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--c-stone);
  margin-bottom: 8px;
}
.page-about .about-team__tasks li:last-child {
  margin-bottom: 0;
}
.page-about .about-team__tasks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 7px;
  height: 7px;
  background: var(--c-jade);
  transform: rotate(45deg);
}

/* ---------- 版本时间线 ---------- */
.page-about .about-timeline__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.55rem, 3.8vw, 2.4rem);
  line-height: 1.22;
  color: var(--c-ink);
  margin: 14px 0 16px;
}
.page-about .about-timeline__lede {
  font-size: 17px;
  line-height: 1.85;
  color: var(--c-stone);
  max-width: 34em;
  margin: 0 0 36px;
}
.page-about .about-timeline__figure {
  margin: 0 0 44px;
}
.page-about .about-timeline__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 26px;
  width: 2px;
  background: linear-gradient(180deg, var(--about-path) 0%, var(--about-path-soft) 100%);
  transform: skewX(-12deg);
  transform-origin: top center;
}
.page-about .about-frame {
  position: relative;
  padding-left: 38px;
  padding-bottom: 20px;
}
.page-about .about-frame:last-child {
  padding-bottom: 0;
}
.page-about .about-frame::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--c-paper);
  border: 2px solid var(--c-jade);
  box-sizing: border-box;
  transition: background-color .3s var(--ease), transform .3s var(--ease);
}
.page-about .about-frame__box[open] + *,
.page-about .about-frame:focus-within::before {
  background: var(--c-jade);
}
.page-about .about-frame:has(details[open])::before {
  background: var(--c-jade);
  transform: scale(1.14);
}
.page-about .about-frame__box {
  border-bottom: 1px solid var(--about-hair);
}
.page-about .about-frame:last-child .about-frame__box {
  border-bottom: 0;
}
.page-about .about-frame__sum {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding: 10px 0 14px;
  cursor: pointer;
  list-style: none;
  outline-offset: 4px;
}
.page-about .about-frame__sum::-webkit-details-marker {
  display: none;
}
.page-about .about-frame__sum:hover .about-frame__what,
.page-about .about-frame__sum:focus-visible .about-frame__what {
  color: var(--c-red);
}
.page-about .about-frame__when {
  font-size: 13px;
  color: var(--c-gold);
  letter-spacing: .06em;
  white-space: nowrap;
}
.page-about .about-frame__what {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.45;
  color: var(--c-ink);
  transition: color .3s var(--ease);
  flex: 1 1 220px;
}
.page-about .about-frame__flag {
  flex: 0 0 auto;
}
.page-about .about-frame__body {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--c-stone);
  max-width: 36em;
  border-left: 2px solid var(--c-jade-soft);
  padding-left: 16px;
}
.page-about .about-frame__box[open] .about-frame__body {
  animation: about-rise .42s var(--ease) both;
}
@keyframes about-rise {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- 服务范围 ---------- */
.page-about .about-scope__inner {
  display: grid;
  gap: 30px;
}
.page-about .about-scope__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.6vw, 2.25rem);
  line-height: 1.24;
  color: var(--c-ink);
  margin: 14px 0 20px;
}
.page-about .about-scope__copy p {
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--c-stone);
  max-width: 34em;
  margin: 0 0 15px;
}
.page-about .about-scope__copy a {
  color: var(--c-red);
  text-decoration: underline;
  text-decoration-color: var(--c-gold-soft);
  text-underline-offset: 3px;
}
.page-about .about-scope__copy a:hover {
  text-decoration-color: var(--c-red);
}
.page-about .about-scope__side {
  padding: 28px 26px;
  color: var(--c-paper);
}
.page-about .about-scope__side-kicker {
  margin: 0 0 8px;
  font-size: 12.5px;
  letter-spacing: .12em;
  color: var(--c-gold-soft);
}
.page-about .about-scope__side-big {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(3.4rem, 9vw, 4.8rem);
  line-height: 1;
  color: var(--c-gold);
  margin: 0 0 6px;
}
.page-about .about-scope__side-label {
  font-size: 15px;
  line-height: 1.65;
  margin: 0 0 20px;
  color: var(--c-paper);
}
.page-about .about-scope__side-list {
  list-style: none;
  margin: 0;
  padding: 16px 0 0;
  border-top: 1px solid rgba(239, 215, 155, .3);
}
.page-about .about-scope__side-list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.7;
  margin-bottom: 9px;
  color: var(--c-gold-soft);
}
.page-about .about-scope__side-list li:last-child {
  margin-bottom: 0;
}
.page-about .about-scope__side-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 6px;
  height: 6px;
  border: 1px solid var(--c-gold);
  transform: rotate(45deg);
}

/* ---------- 栏目共建 ---------- */
.page-about .about-partner__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.55rem, 3.8vw, 2.4rem);
  line-height: 1.22;
  color: var(--c-ink);
  margin: 14px 0 16px;
}
.page-about .about-partner__lede {
  font-size: 17px;
  line-height: 1.85;
  color: var(--c-stone);
  max-width: 34em;
  margin: 0 0 34px;
}
.page-about .about-partner__grid {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--about-hair);
}
.page-about .about-partner__point {
  padding: 22px 0;
  border-bottom: 1px solid var(--about-hair);
  display: grid;
  gap: 8px 20px;
}
.page-about .about-partner__point-num {
  font-size: 13px;
  color: var(--c-gold);
  letter-spacing: .06em;
}
.page-about .about-partner__point-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.4;
  color: var(--c-ink);
  margin: 0;
}
.page-about .about-partner__point p {
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--c-stone);
  margin: 0;
  max-width: 34em;
}
.page-about .about-partner__point a {
  color: var(--c-red);
  text-decoration: underline;
  text-decoration-color: var(--c-gold-soft);
  text-underline-offset: 3px;
}
.page-about .about-partner__point a:hover {
  text-decoration-color: var(--c-red);
}

/* ---------- 收束 ---------- */
.page-about .about-next__inner {
  border-top: 2px solid var(--c-ink);
  padding-top: 30px;
  display: grid;
  gap: 28px;
}
.page-about .about-next__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.6vw, 2.2rem);
  line-height: 1.24;
  color: var(--c-ink);
  margin: 12px 0 16px;
}
.page-about .about-next__copy p {
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--c-stone);
  max-width: 34em;
  margin: 0;
}
.page-about .about-next__copy a {
  color: var(--c-red);
  text-decoration: underline;
  text-decoration-color: var(--c-gold-soft);
  text-underline-offset: 3px;
}
.page-about .about-next__copy a:hover {
  text-decoration-color: var(--c-red);
}
.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-lead__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }
  .page-about .about-lead__facts li {
    flex-direction: column;
    gap: 6px;
  }
  .page-about .about-lead__fact-num {
    min-width: 0;
  }
  .page-about .about-team__panels {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-partner__point {
    grid-template-columns: 44px minmax(0, 1fr);
    align-items: start;
  }
  .page-about .about-partner__point p {
    grid-column: 2;
  }
}

@media (min-width: 900px) {
  .page-about .about-claim__inner {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, .82fr);
    align-items: center;
    gap: 60px;
  }
  .page-about .about-team__panels {
    grid-template-columns: 1.15fr .95fr .9fr;
    align-items: start;
  }
  .page-about .about-team__card:nth-child(2) {
    margin-top: 32px;
  }
  .page-about .about-team__card:nth-child(3) {
    margin-top: 14px;
  }
  .page-about .about-scope__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .8fr);
    gap: 56px;
    align-items: start;
  }
  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, .8fr);
    gap: 48px;
    align-items: end;
  }
  .page-about .about-next__actions {
    justify-content: flex-end;
  }
  .page-about .about-step__inner {
    max-width: 62ch;
  }
}

@media (min-width: 1100px) {
  .page-about .about-lead__lede {
    font-size: 18px;
  }
  .page-about .about-frame {
    padding-left: 48px;
  }
  .page-about .about-timeline__list::before {
    left: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__card::after,
  .page-about .about-frame::before,
  .page-about .about-frame__what {
    transition: none;
  }
  .page-about .about-frame__box[open] .about-frame__body {
    animation: none;
  }
}
<<<END>>>