.page-about {
  background: var(--ub-paper);
  color: var(--ub-ink);
  font-family: var(--ub-font-body);
}

.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--ub-teal);
  outline-offset: 3px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ub-deep);
  color: var(--ub-paper);
  padding: 30px 0 40px;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 30%;
  right: -20%;
  bottom: -50%;
  height: 90%;
  background: linear-gradient(115deg, rgba(0, 194, 168, 0.22), rgba(140, 139, 158, 0) 68%);
  transform: skewY(-9deg);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 28px;
}

.page-about .about-hero .breadcrumb {
  margin: 0 0 18px;
}

.page-about .about-hero .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
}

.page-about .about-hero .breadcrumb__item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: rgba(246, 241, 231, 0.6);
}

.page-about .about-hero .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: rgba(246, 241, 231, 0.34);
}

.page-about .about-hero .breadcrumb__item a {
  color: rgba(246, 241, 231, 0.86);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .about-hero .breadcrumb__item a:hover {
  border-bottom-color: var(--ub-teal);
}

.page-about .about-hero__kicker {
  margin: 0 0 14px;
  font-family: var(--ub-font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--ub-teal);
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 17em;
  font-family: var(--ub-font-display);
  font-weight: 900;
  font-size: clamp(28px, 7.4vw, 54px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--ub-paper-light);
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 33em;
  font-size: clamp(15px, 3.8vw, 17px);
  line-height: 1.85;
  color: rgba(246, 241, 231, 0.84);
}

.page-about .about-hero__facts {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .about-hero__facts li {
  padding-left: 12px;
  border-left: 1px solid rgba(246, 241, 231, 0.24);
  font-size: 14px;
  line-height: 1.65;
  color: rgba(246, 241, 231, 0.78);
}

.page-about .about-hero__facts b {
  display: block;
  margin-bottom: 4px;
  font-family: var(--ub-font-display);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ub-gold);
}

.page-about .about-chapters {
  background: var(--ub-paper);
  color: var(--ub-ink);
  padding: 18px 20px 20px;
  border-top: 3px solid var(--ub-teal);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .about-chapters__label {
  margin: 0 0 10px;
  font-family: var(--ub-font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--ub-moss);
}

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

.page-about .about-chapters__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 6px;
  font-size: 14px;
  color: var(--ub-ink);
  text-decoration: none;
  border-top: 1px solid var(--ub-line-soft);
}

.page-about .about-chapters__list li:first-child a {
  border-top: 0;
}

.page-about .about-chapters__list a:hover {
  color: var(--ub-deep);
  background: rgba(0, 194, 168, 0.12);
}

.page-about .about-chapters__num {
  font-size: 12px;
  color: var(--ub-clay);
}

/* ---------- 主体框架 ---------- */
.page-about .about-body {
  padding-top: 36px;
  padding-bottom: 64px;
}

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

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

.page-about .about-sec {
  padding: 32px 0;
  border-top: 1px solid var(--ub-line-soft);
}

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

.page-about .about-sec__head {
  display: grid;
  gap: 10px;
  margin-bottom: 18px;
}

.page-about .about-sec__head::after {
  content: "";
  width: 42px;
  height: 3px;
  background: var(--ub-teal);
}

.page-about .about-sec__num {
  font-size: 13px;
  letter-spacing: 0.22em;
  color: var(--ub-clay);
}

.page-about .about-sec__title {
  margin: 0;
  max-width: 22em;
  font-family: var(--ub-font-display);
  font-weight: 800;
  font-size: clamp(21px, 5.2vw, 30px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--ub-deep);
}

/* ---------- 通用正文 ---------- */
.page-about .about-text {
  margin: 0 0 16px;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ub-ink);
}

.page-about .about-figure {
  margin: 24px 0 0;
}

.page-about .media-frame__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-note {
  margin: 20px 0 0;
  max-width: 32em;
}

.page-about .about-points {
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-points li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ub-moss);
}

.page-about .about-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--ub-teal);
}

.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin: 0;
}

.page-about .about-text-link {
  font-size: 15px;
  color: var(--ub-deep);
  text-decoration: none;
  border-bottom: 2px solid var(--ub-gold);
  padding-bottom: 2px;
}

.page-about .about-text-link:hover {
  border-bottom-color: var(--ub-teal);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  margin: 26px 0 0;
  padding: 0 0 0 20px;
  list-style: none;
  display: grid;
  gap: 22px;
  border-left: 1px solid var(--ub-line);
}

.page-about .about-timeline__item {
  position: relative;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ub-teal);
  box-shadow: 0 0 0 3px var(--ub-paper);
}

.page-about .about-timeline__item--now::before {
  background: var(--ub-gold);
  box-shadow: 0 0 0 3px var(--ub-paper), 0 0 0 4px var(--ub-clay);
}

.page-about .about-timeline__year {
  display: inline-block;
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--ub-deep);
}

.page-about .about-timeline__item--now .about-timeline__year {
  color: var(--ub-clay);
}

.page-about .about-timeline__stage {
  display: block;
  margin: 6px 0 4px;
  font-family: var(--ub-font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--ub-ink);
}

.page-about .about-timeline__desc {
  margin: 0;
  max-width: 30em;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ub-moss);
}

/* ---------- 分段切换 ---------- */
.page-about .about-tabs {
  margin: 30px 0 0;
}

.page-about .about-tabs .tabs__list {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  padding-bottom: 2px;
  border-bottom: 1px solid var(--ub-line);
}

.page-about .about-tabs .about-tabs__tab {
  flex: 0 0 auto;
  appearance: none;
  padding: 11px 16px;
  border: 1px solid transparent;
  border-bottom: 0;
  background: transparent;
  font-family: var(--ub-font-display);
  font-size: 14px;
  font-weight: 700;
  color: var(--ub-moss);
  cursor: pointer;
}

.page-about .about-tabs .about-tabs__tab:hover {
  color: var(--ub-deep);
}

.page-about .about-tabs .about-tabs__tab[aria-selected="true"] {
  color: var(--ub-deep);
  background: var(--ub-paper-light);
  border-color: var(--ub-line);
  box-shadow: inset 0 -3px 0 var(--ub-teal);
}

.page-about .about-tabs .tabs__panel {
  padding: 18px 0 0;
}

.page-about .about-tabs .tabs__panel .about-text:last-child {
  margin-bottom: 0;
}

/* ---------- 三审工序 ---------- */
.page-about .about-steps {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .about-step {
  padding: 20px 20px 22px;
  background: var(--ub-paper-light);
  border: 1px solid var(--ub-line-soft);
  border-left: 3px solid var(--ub-teal);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-about .about-step__num {
  display: block;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--ub-clay);
}

.page-about .about-step__title {
  margin: 8px 0 8px;
  font-family: var(--ub-font-display);
  font-weight: 800;
  font-size: 18px;
  color: var(--ub-deep);
}

.page-about .about-step__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ub-moss);
}

/* ---------- 小屏场景 ---------- */
.page-about .about-split {
  display: grid;
  gap: 22px;
}

.page-about .about-split .about-figure {
  margin: 0;
}

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

/* ---------- 服务规模 ---------- */
.page-about .about-stats {
  padding: clamp(22px, 5vw, 40px);
}

.page-about .about-stats .about-sec__num {
  color: var(--ub-teal);
}

.page-about .about-stats .about-sec__title {
  color: var(--ub-paper-light);
}

.page-about .about-stats__grid {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 18px;
}

.page-about .about-stat {
  padding: 8px 0 8px 14px;
  border-left: 2px solid var(--ub-teal);
}

.page-about .about-stat__num {
  display: block;
  font-weight: 700;
  font-size: clamp(25px, 6vw, 34px);
  line-height: 1.1;
  color: var(--ub-gold);
}

.page-about .about-stat__label {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(246, 241, 231, 0.8);
}

.page-about .about-stats__note {
  margin: 24px 0 0;
  max-width: 34em;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(246, 241, 231, 0.66);
  border-top: 1px solid var(--ub-line-light);
  padding-top: 16px;
}

/* ---------- 品牌主张 ---------- */
.page-about .about-sec--claim {
  padding-bottom: 8px;
}

.page-about .about-sec--claim .about-sec__head {
  margin-bottom: 10px;
}

.page-about .about-claim__text {
  margin: 0;
  max-width: 14em;
  font-family: var(--ub-font-display);
  font-weight: 900;
  font-size: clamp(26px, 7vw, 46px);
  line-height: 1.24;
  letter-spacing: -0.02em;
  color: var(--ub-deep);
}

.page-about .about-claim__sub {
  margin: 18px 0 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ub-ink);
}

.page-about .about-claim__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 22px 0 0;
}

.page-about .about-claim .btn--ghost {
  border-color: var(--ub-deep);
  color: var(--ub-deep);
  background: transparent;
}

.page-about .about-claim__meta {
  margin: 20px 0 0;
  max-width: 34em;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ub-moss);
}

.page-about .about-claim__meta .mono {
  color: var(--ub-deep);
  word-break: break-all;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-stats__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 26px;
  }
}

@media (min-width: 760px) {
  .page-about .about-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 44px 0 56px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-chapters {
    margin-top: 34px;
  }

  .page-about .about-body {
    display: grid;
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 52px;
    padding-top: 60px;
    padding-bottom: 88px;
  }

  .page-about .about-rail {
    display: block;
  }

  .page-about .about-rail__list {
    position: sticky;
    top: calc(var(--ub-vb-h) + 30px);
    margin: 0;
    padding: 0 0 0 14px;
    list-style: none;
    display: grid;
    gap: 16px;
    border-left: 1px solid var(--ub-line);
  }

  .page-about .about-rail__item {
    display: block;
    font-size: 11px;
    letter-spacing: 0.14em;
    color: var(--ub-violet);
    text-decoration: none;
  }

  .page-about .about-rail__item:hover {
    color: var(--ub-clay);
  }

  .page-about .about-sec {
    padding: 48px 0;
  }

  .page-about .about-sec--narrow {
    max-width: 860px;
  }

  .page-about .about-timeline {
    padding-left: 0;
    border-left: 0;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
    align-items: start;
    margin-top: 34px;
  }

  .page-about .about-timeline__item {
    padding-top: 14px;
    border-top: 2px solid var(--ub-line);
  }

  .page-about .about-timeline__item::before {
    left: 0;
    top: -6px;
    box-shadow: none;
  }

  .page-about .about-timeline__item:nth-child(1) {
    margin-top: 30px;
  }

  .page-about .about-timeline__item:nth-child(2) {
    margin-top: 20px;
  }

  .page-about .about-timeline__item:nth-child(3) {
    margin-top: 10px;
  }

  .page-about .about-timeline__item:nth-child(4) {
    margin-top: 0;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    gap: 36px;
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-about .about-figure--wide {
    max-width: 900px;
  }

  .page-about .about-claim__text {
    max-width: 12em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
    animation: none !important;
  }
}
<<<END>>>