.page-about {
  --about-rule: 1px solid rgba(183, 197, 206, 0.26);
  --about-rule-strong: 1px solid rgba(183, 197, 206, 0.45);
  position: relative;
  color: var(--paper);
  background: var(--ink);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about [data-filterable][hidden] {
  display: none !important;
}

.page-about .breadcrumb {
  padding-top: clamp(18px, 3vw, 28px);
  font-size: var(--fs-note);
  color: var(--mist);
}

.page-about .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--gold);
  border-color: var(--gold);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(30px, 5vw, 60px) 0 clamp(32px, 5vw, 64px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  left: -12%;
  right: -12%;
  top: 46%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(242, 181, 68, .6), rgba(87, 215, 232, .42), transparent);
  transform: rotate(-8deg);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  align-items: center;
}

.page-about .about-hero__copy h1 {
  margin: 14px 0 0;
  font-family: var(--font-sans);
  font-size: clamp(36px, 7.2vw, 82px);
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: -0.03em;
  color: var(--white);
}

.page-about .about-hero__lede {
  margin: clamp(18px, 3vw, 26px) 0 0;
  max-width: var(--measure);
  font-size: var(--fs-body);
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 4vw, 36px);
}

.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .02em;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 2px;
  transition: transform .2s var(--ease), background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .btn--gold {
  background: var(--gold);
  color: var(--ink);
}

.page-about .btn--gold:hover,
.page-about .btn--gold:focus-visible {
  background: var(--amber);
  transform: translateY(-2px);
}

.page-about .btn--ghost {
  border-color: rgba(183, 197, 206, .5);
  color: var(--paper);
}

.page-about .btn--ghost:hover,
.page-about .btn--ghost:focus-visible {
  border-color: var(--sky);
  color: var(--sky);
  transform: translateY(-2px);
}

.page-about .about-hero__media {
  position: relative;
  clip-path: polygon(0 0, 100% 0, 100% 90%, 7% 100%);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(1.05) contrast(1.03);
}

.page-about .about-hero__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0;
  padding: 10px 16px;
  background: rgba(7, 19, 31, .82);
  border-top: var(--about-rule-strong);
  border-right: var(--about-rule-strong);
  font-size: var(--fs-note);
  color: var(--paper);
}

.page-about .label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-label);
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--sky);
}

.page-about .label::before {
  content: "";
  width: 14px;
  height: 1px;
  background: currentColor;
}

.page-about .eyebrow {
  display: inline-block;
  margin: 0;
  font-size: var(--fs-label);
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .num {
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: .02em;
}

/* ---------- 速览与筛选 ---------- */

.page-about .about-scan {
  padding: clamp(36px, 6vw, 72px) 0;
  background: var(--ink-soft);
  border-top: var(--about-rule);
  border-bottom: var(--about-rule);
}

.page-about .about-scan__head .h2 {
  margin: 12px 0 0;
  font-size: var(--fs-h2);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .prose {
  max-width: var(--measure);
  margin: clamp(14px, 2vw, 20px) 0 0;
  font-size: var(--fs-body);
  line-height: 1.8;
  color: var(--mist);
}

.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .chip {
  padding: 8px 16px;
  font-family: inherit;
  font-size: var(--fs-label);
  letter-spacing: .14em;
  color: var(--mist);
  background: transparent;
  border: 1px solid rgba(183, 197, 206, .38);
  border-radius: 999px;
  cursor: pointer;
  transition: color .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease);
}

.page-about .chip:hover,
.page-about .chip:focus-visible {
  color: var(--gold);
  border-color: var(--gold);
}

.page-about .chip[aria-pressed="true"] {
  color: var(--ink);
  background: var(--gold);
  border-color: var(--gold);
  font-weight: 700;
}

.page-about .about-scan__status {
  margin: 12px 0 0;
  font-size: var(--fs-note);
  color: var(--sky);
}

.page-about .about-scan__status:empty {
  display: none;
}

.page-about .scan-list {
  display: grid;
  gap: 0;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
  border-top: var(--about-rule);
}

.page-about .scan-item {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 12px;
  align-items: start;
  padding: 16px 0;
  border-bottom: var(--about-rule);
}

.page-about .scan-item__tag {
  color: var(--gold);
  letter-spacing: .16em;
}

.page-about .scan-item__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--paper);
}

.page-about .scan-item__text .num {
  color: var(--amber);
  font-size: 1.06em;
}

/* ---------- 主体：章节索引 + 内容 ---------- */

.page-about .about-body {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  padding-top: clamp(36px, 6vw, 72px);
}

.page-about .about-index__title {
  margin: 0 0 12px;
  color: var(--mist);
}

.page-about .about-index__list {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__list li {
  flex: 0 0 auto;
}

.page-about .about-index__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  font-size: var(--fs-note);
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid rgba(183, 197, 206, .3);
  border-radius: 2px;
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .about-index__list a .num {
  font-size: 11px;
  color: var(--sky);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--ink);
  background: var(--gold);
  border-color: var(--gold);
}

.page-about .about-index__list a:hover .num,
.page-about .about-index__list a:focus-visible .num {
  color: var(--ink);
}

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

.page-about .about-chapter {
  padding: clamp(32px, 5vw, 56px) 0;
  border-top: var(--about-rule);
}

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

.page-about .about-chapter .h2 {
  margin: 12px 0 0;
  font-size: var(--fs-h2);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .note {
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 14px 0 14px 18px;
  border-left: 2px solid var(--sky);
  font-size: var(--fs-note);
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 服务范围数字 ---------- */

.page-about .scope-figures {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
  margin-top: clamp(26px, 4vw, 42px);
}

.page-about .scope-figure {
  padding-top: 14px;
  border-top: 2px solid var(--slate);
}

.page-about .scope-figure:nth-child(1) {
  border-top-color: var(--gold);
}

.page-about .scope-figure:nth-child(2) {
  border-top-color: var(--sky);
}

.page-about .scope-figure:nth-child(3) {
  border-top-color: var(--amber);
}

.page-about .scope-figure:nth-child(4) {
  border-top-color: var(--mist);
}

.page-about .scope-figure__num {
  display: block;
  font-size: clamp(42px, 6vw, 66px);
  line-height: 1;
  color: var(--white);
}

.page-about .scope-figure:nth-child(1) .scope-figure__num {
  color: var(--gold);
}

.page-about .scope-figure:nth-child(2) .scope-figure__num {
  color: var(--sky);
}

.page-about .scope-figure:nth-child(3) .scope-figure__num {
  color: var(--amber);
}

.page-about .scope-figure__num small {
  margin-left: 4px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .scope-figure__label {
  display: block;
  margin-top: 10px;
  font-size: var(--fs-note);
  letter-spacing: .1em;
  color: var(--paper);
}

.page-about .scope-figure__text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .path-list {
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  border-top: var(--about-rule);
}

.page-about .path-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 14px 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist);
  border-bottom: var(--about-rule);
}

.page-about .path-item .num {
  font-size: var(--fs-note);
  letter-spacing: .14em;
  color: var(--gold);
}

/* ---------- 时间线 ---------- */

.page-about .timeline {
  position: relative;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold), var(--sky) 55%, rgba(87, 215, 232, 0));
}

.page-about .timeline__item {
  position: relative;
  padding-left: 30px;
  border-bottom: var(--about-rule);
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  width: 11px;
  height: 11px;
  background: var(--ink);
  border: 1px solid var(--gold);
  border-radius: 50%;
}

.page-about .timeline__details {
  padding: 14px 0;
}

.page-about .timeline__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  cursor: pointer;
  list-style: none;
}

.page-about .timeline__summary::-webkit-details-marker {
  display: none;
}

.page-about .timeline__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--sky);
  transition: transform .2s var(--ease);
}

.page-about .timeline__details[open] .timeline__summary::after {
  content: "−";
  color: var(--gold);
}

.page-about .timeline__year {
  font-size: clamp(20px, 3vw, 26px);
  color: var(--gold);
}

.page-about .timeline__title {
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .timeline__body {
  margin: 12px 0 0;
  padding-left: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-visual {
  margin: clamp(30px, 4vw, 46px) 0 0;
}

.page-about .about-visual .media {
  overflow: hidden;
  border: var(--about-rule-strong);
}

.page-about .about-visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-visual .figcap {
  margin: 10px 0 0;
  font-size: var(--fs-note);
  color: var(--mist);
}

/* ---------- 团队 ---------- */

.page-about .team {
  display: grid;
  gap: clamp(26px, 4vw, 40px);
  margin-top: clamp(26px, 4vw, 40px);
}

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

.page-about .team-group {
  padding: 16px 0;
  border-top: var(--about-rule);
}

.page-about .team-group:last-child {
  border-bottom: var(--about-rule);
}

.page-about .team-group__name {
  color: var(--gold);
  letter-spacing: .18em;
}

.page-about .team-group__desc {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .team__aside .media {
  overflow: hidden;
  border: var(--about-rule-strong);
}

.page-about .team__aside img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .team-card {
  margin-top: 18px;
  padding: clamp(18px, 3vw, 26px);
  background: var(--paper);
  color: var(--ink);
  box-shadow: 10px 10px 0 rgba(242, 181, 68, .22);
}

.page-about .team-card__title {
  margin: 0;
  font-size: 15px;
  font-weight: 900;
  letter-spacing: .02em;
  color: var(--ink);
}

.page-about .team-card__text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-raise);
}

/* ---------- 服务原则 ---------- */

.page-about .principle-list {
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
  counter-reset: principle;
}

.page-about .principle {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 14px;
  padding: 18px 0;
  border-top: var(--about-rule);
}

.page-about .principle:last-child {
  border-bottom: var(--about-rule);
}

.page-about .principle__num {
  font-size: 13px;
  color: var(--sky);
  padding-top: 3px;
}

.page-about .principle__title {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
}

.page-about .principle__text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 联系摘要 ---------- */

.page-about .contact-brief {
  margin-top: clamp(24px, 4vw, 36px);
  padding: clamp(22px, 3.5vw, 34px);
  background: var(--teal);
  border: 1px solid rgba(87, 215, 232, .32);
}

.page-about .contact-brief__list {
  display: grid;
  gap: 16px;
  margin: 0;
}

.page-about .contact-brief__item {
  display: grid;
  gap: 4px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(242, 239, 230, .18);
}

.page-about .contact-brief__item:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .contact-brief__key {
  font-size: var(--fs-label);
  letter-spacing: .18em;
  color: var(--sky);
}

.page-about .contact-brief__val {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--paper);
  word-break: break-word;
}

.page-about .contact-brief__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .scan-list {
    grid-template-columns: 1fr 1fr;
    column-gap: clamp(24px, 4vw, 48px);
  }

  .page-about .scan-item {
    padding: 16px 0;
  }

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

  .page-about .path-item {
    grid-template-columns: 120px 1fr;
    gap: 16px;
    align-items: baseline;
  }

  .page-about .team {
    grid-template-columns: minmax(0, 1fr) minmax(0, .92fr);
    align-items: start;
  }

  .page-about .contact-brief__list {
    grid-template-columns: 1fr 1fr;
    column-gap: clamp(20px, 3vw, 40px);
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
  }

  .page-about .about-body {
    grid-template-columns: minmax(150px, 190px) minmax(0, 1fr);
    column-gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }

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

  .page-about .about-index__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
    border-left: var(--about-rule);
  }

  .page-about .about-index__list li + li {
    margin-top: 2px;
  }

  .page-about .about-index__list a {
    display: flex;
    width: 100%;
    padding: 10px 0 10px 16px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    margin-left: -1px;
    background: transparent;
    white-space: normal;
  }

  .page-about .about-index__list a:hover,
  .page-about .about-index__list a:focus-visible {
    color: var(--gold);
    border-left-color: var(--gold);
    background: transparent;
  }

  .page-about .about-index__list a:hover .num,
  .page-about .about-index__list a:focus-visible .num {
    color: var(--gold);
  }

  .page-about .scope-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .scope-figure:nth-child(2) {
    margin-top: 24px;
  }

  .page-about .scope-figure:nth-child(4) {
    margin-top: 12px;
  }

  .page-about .about-scan__head {
    max-width: 760px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .btn,
  .page-about .chip,
  .page-about .timeline__summary::after {
    transition: none;
  }

  .page-about .btn:hover,
  .page-about .btn:focus-visible {
    transform: none;
  }
}
<<<END>>>