.page-about {
  --about-rule: rgba(201, 154, 61, .36);
  --about-rule-soft: rgba(201, 154, 61, .24);
  --about-w: 760px;
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about .about-body__sr {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 5vw, 56px) 0 clamp(28px, 4vw, 52px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -12%;
  right: -24%;
  width: 78%;
  height: 124%;
  background: linear-gradient(152deg, rgba(200, 16, 46, .09), rgba(122, 18, 34, .14) 55%, transparent 76%);
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: clamp(22px, 4vw, 52px);
  margin-top: clamp(18px, 3vw, 30px);
  align-items: start;
}

.page-about .about-hero__title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(32px, 6vw, 60px);
  line-height: 1.1;
  letter-spacing: -.01em;
  margin: .34em 0 .5em;
  color: var(--c-ink);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 54ch;
  font-size: clamp(15px, 1.9vw, 17px);
  line-height: 1.9;
  color: var(--c-char);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: clamp(22px, 3.5vw, 34px) 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--about-rule);
}

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

.page-about .fact__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(19px, 2.7vw, 27px);
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--c-red);
  line-height: 1.2;
}

.page-about .fact__label {
  font-size: 12.5px;
  letter-spacing: .04em;
  line-height: 1.5;
  color: var(--c-slate);
  margin-bottom: 4px;
}

.page-about .about-hero__fig {
  margin: 0;
}

/* ---------- 图片框与悬停 ---------- */
.page-about .about-fig__frame {
  overflow: hidden;
  background: var(--c-paper);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .about-fig__frame img {
  width: 100%;
  height: auto;
  object-fit: cover;
  transition: transform .5s var(--ease);
}

.page-about .about-fig:hover .about-fig__frame img {
  transform: scale(1.04);
}

/* ---------- 长文主体 ---------- */
.page-about .about-body {
  padding-top: 0;
}

.page-about .about-body__grid {
  display: grid;
  gap: clamp(24px, 4vw, 56px);
  align-items: start;
}

.page-about .about-index {
  display: none;
}

.page-about .about-flow {
  min-width: 0;
  max-width: var(--about-w);
}

/* 章 */
.page-about .about-chap {
  padding-top: clamp(28px, 4.5vw, 48px);
  margin-top: clamp(30px, 5vw, 60px);
  border-top: 1px solid var(--about-rule);
}

.page-about .about-chap:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.page-about .about-chap__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: clamp(14px, 2.4vw, 22px);
}

.page-about .about-chap__no {
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--c-gold);
  flex: none;
}

.page-about .about-chap__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(23px, 3.4vw, 35px);
  line-height: 1.22;
  color: var(--c-ink);
}

.page-about .about-chap__body p {
  margin: 0 0 1.05em;
  font-size: clamp(15px, 1.75vw, 16.5px);
  line-height: 1.92;
  color: var(--c-char);
  max-width: 68ch;
}

.page-about .about-chap__tail {
  margin-top: clamp(16px, 2.6vw, 24px) !important;
  font-size: 14.5px !important;
  line-height: 1.85 !important;
  color: var(--c-slate) !important;
  padding-left: 14px;
  border-left: 2px solid var(--about-rule);
}

.page-about .about-chap__tail a {
  color: var(--c-red);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 16, 46, .35);
}

.page-about .about-chap__tail a:hover {
  color: var(--c-red-dark);
  border-bottom-color: var(--c-red-dark);
}

/* 暗红切角引用块 */
.page-about .about-quote {
  margin: clamp(20px, 3vw, 30px) 0 clamp(18px, 2.6vw, 24px);
  padding: clamp(20px, 3vw, 30px) clamp(18px, 3vw, 32px);
  background: linear-gradient(135deg, var(--c-red-dark), #4a0b15);
  color: var(--c-jade);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(16px, 2.1vw, 20px);
  line-height: 1.72;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

/* 三条服务线 */
.page-about .track-list {
  list-style: none;
  margin: clamp(16px, 2.6vw, 24px) 0 0;
  padding: 0;
}

.page-about .track {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(12px, 2.4vw, 22px);
  padding: clamp(16px, 2.6vw, 22px) 0;
  border-top: 1px solid var(--about-rule-soft);
}

.page-about .track:last-child {
  border-bottom: 1px solid var(--about-rule-soft);
}

.page-about .track__no {
  align-self: start;
  font-size: 12px;
  line-height: 1.3;
  letter-spacing: .12em;
  color: var(--c-red);
  padding: 3px 7px;
  border: 1px solid rgba(200, 16, 46, .32);
}

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

.page-about .track__body h3 {
  margin: 0 0 .45em;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(16.5px, 2.1vw, 20px);
  line-height: 1.4;
  color: var(--c-ink);
}

.page-about .track__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.88;
  color: var(--c-char);
}

/* 团队错位图文 */
.page-about .about-split {
  display: grid;
  gap: clamp(20px, 3.6vw, 36px);
  margin-top: clamp(6px, 1.4vw, 12px);
  align-items: start;
}

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

.page-about .about-split__h {
  margin: 0 0 .5em;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(17px, 2.2vw, 21px);
  color: var(--c-ink);
  padding-left: 12px;
  border-left: 3px solid var(--c-gold);
  line-height: 1.4;
}

.page-about .about-split__text p {
  margin: 0 0 1.4em;
}

.page-about .about-split__fig {
  margin: 0;
}

/* 时间轴 */
.page-about .timeline {
  position: relative;
  list-style: none;
  margin: clamp(18px, 2.8vw, 26px) 0 0;
  padding: 0 0 0 28px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, rgba(201, 154, 61, .72), rgba(201, 154, 61, .12));
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: clamp(22px, 3.6vw, 32px);
}

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

.page-about .timeline__dot {
  position: absolute;
  left: -28px;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--c-gold-bright);
  border: 1px solid var(--c-gold);
  box-shadow: 0 0 0 4px rgba(201, 154, 61, .14);
}

.page-about .timeline__item--now .timeline__dot {
  background: var(--c-red);
  border-color: var(--c-red-dark);
  box-shadow: 0 0 0 4px rgba(200, 16, 46, .16);
}

.page-about .timeline__era {
  margin: 0 0 4px;
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--c-slate);
}

.page-about .timeline__content h3 {
  margin: 0 0 .38em;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(16px, 2.05vw, 19.5px);
  line-height: 1.4;
  color: var(--c-ink);
}

.page-about .timeline__content p {
  margin: 0;
  font-size: 14.8px;
  line-height: 1.86;
  color: var(--c-char);
  max-width: 60ch;
}

.page-about .about-versions__fig {
  margin: clamp(20px, 3vw, 30px) 0 0;
}

/* 备案与联系 */
.page-about .about-registry {
  margin: clamp(16px, 2.6vw, 24px) 0 0;
  padding: clamp(20px, 3.4vw, 38px);
  background: var(--c-ink);
  color: var(--c-jade);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), calc(100% - 28px) 100%, 0 100%);
}

.page-about .reg-list {
  margin: 0;
}

.page-about .reg-list__row {
  display: grid;
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px solid rgba(201, 154, 61, .26);
}

.page-about .reg-list__row:first-child {
  padding-top: 0;
}

.page-about .reg-list__row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .reg-list dt {
  font-size: 12.5px;
  letter-spacing: .06em;
  color: rgba(247, 243, 234, .6);
}

.page-about .reg-list dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--c-jade);
  overflow-wrap: anywhere;
  word-break: break-word;
}

.page-about .reg-list dd.mono,
.page-about .reg-list dd .mono {
  font-family: var(--font-mono);
  letter-spacing: -.01em;
}

.page-about .about-registry .copy-btn {
  margin-left: 10px;
  padding: 3px 10px;
  font-family: var(--font-body);
  font-size: 12px;
  line-height: 1.6;
  color: var(--c-gold-bright);
  background: transparent;
  border: 1px solid rgba(201, 154, 61, .7);
  border-radius: 2px;
  cursor: pointer;
  transition: background .2s var(--ease), color .2s var(--ease);
}

.page-about .about-registry .copy-btn:hover {
  background: rgba(255, 215, 106, .14);
  color: var(--c-gold-bright);
}

/* ---------- 显现 ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .6s var(--ease), transform .6s var(--ease);
}

.page-about [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-about .reg-list__row {
    grid-template-columns: 110px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }

  .page-about .about-hero__facts {
    gap: 18px;
  }
}

@media (min-width: 760px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    align-items: center;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  }
}

@media (min-width: 1000px) {
  .page-about .about-body__grid {
    grid-template-columns: 186px minmax(0, 1fr);
    gap: 68px;
  }

  .page-about .about-index {
    display: block;
    position: sticky;
    top: 32px;
    align-self: start;
  }

  .page-about .about-index__title {
    margin: 0 0 14px;
    font-family: var(--font-mono);
    font-size: 11.5px;
    letter-spacing: .18em;
    color: var(--c-slate);
  }

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

  .page-about .about-index__link {
    display: flex;
    align-items: baseline;
    gap: 10px;
    padding: 9px 0 9px 13px;
    font-size: 14px;
    line-height: 1.5;
    color: var(--c-char);
    text-decoration: none;
    border-left: 2px solid rgba(201, 154, 61, .32);
    transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
  }

  .page-about .about-index__link .mono {
    font-size: 11.5px;
    color: var(--c-gold);
    flex: none;
  }

  .page-about .about-index__link:hover {
    color: var(--c-red);
    border-left-color: var(--c-red);
    background: rgba(200, 16, 46, .04);
  }

  .page-about .about-index__link[aria-current="true"] {
    color: var(--c-red);
    font-weight: 700;
    border-left-color: var(--c-red);
    background: rgba(200, 16, 46, .05);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .about-fig:hover .about-fig__frame img {
    transform: none;
  }

  .page-about .about-fig__frame img {
    transition: none;
  }
}
<<<END>>>