.page-about {
  --rail-w: 208px;
  --about-ink-soft: rgba(20, 18, 15, 0.76);
  --about-ink-mute: rgba(20, 18, 15, 0.58);
  --about-teal-soft: rgba(11, 58, 60, 0.1);
  --about-teal-line: rgba(11, 58, 60, 0.24);
  color: var(--ink);
}

.page-about .about-crumb {
  padding-top: 20px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(20px, 4vw, 44px) 0 clamp(36px, 6vw, 76px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

.page-about .about-hero__copy h1 {
  font-family: var(--font-display);
  font-size: clamp(34px, 7.4vw, 62px);
  line-height: 1.06;
  font-weight: 800;
  letter-spacing: 0.01em;
  margin: 12px 0 0;
  color: var(--teal);
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 46em;
  font-size: 16px;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 26px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-figure {
  background: var(--sand);
  padding: 14px 14px 12px;
}

.page-about .about-figure__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.page-about .about-figure__label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--about-ink-mute);
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--sand-deep);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  filter: saturate(0.82) contrast(1.06);
}

.page-about .about-hero__caption {
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 12px;
  padding: 10px 13px;
  background: var(--glass);
  -webkit-backdrop-filter: blur(7px);
  backdrop-filter: blur(7px);
  border-left: 3px solid var(--orange);
  font-size: 12px;
  line-height: 1.62;
  color: var(--ink);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: end;
    gap: 44px;
  }
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-hero__caption {
    left: 14px;
    right: auto;
    max-width: 76%;
    bottom: 14px;
  }
}

/* ---------- 通用区块 ---------- */
.page-about .about-block {
  padding: clamp(38px, 6vw, 74px) 0;
}

.page-about .about-block .section-head__title {
  color: var(--teal);
}

.page-about .about-block .section-head__lede {
  color: var(--about-ink-soft);
}

.page-about .about-block .text-link {
  color: var(--orange-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

/* ---------- 时间线档案 ---------- */
.page-about .about-archive {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin-top: 34px;
}

.page-about .about-archive__rail-title {
  margin: 0 0 10px;
  color: var(--about-ink-mute);
}

.page-about .year-index {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: thin;
  padding-bottom: 4px;
}

.page-about .year-index__item {
  flex: 0 0 auto;
}

.page-about .year-index__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 11px;
  text-decoration: none;
  color: var(--ink);
  white-space: nowrap;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.4);
  transition: color 180ms var(--ease), background-color 180ms var(--ease),
    border-color 180ms var(--ease);
}

.page-about .year-index__num {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.page-about .year-index__label {
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--about-ink-mute);
}

.page-about .year-index__link:hover {
  border-color: var(--about-teal-line);
  background: var(--about-teal-soft);
}

.page-about .year-index__link.is-active {
  background: var(--teal);
  border-color: var(--teal);
}

.page-about .year-index__link.is-active .year-index__num,
.page-about .year-index__link.is-active .year-index__label {
  color: var(--cyan);
}

.page-about .about-archive__body {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about .era {
  position: relative;
  background: var(--sand-deep);
  border: 1px solid var(--line-soft);
  border-left: 4px solid var(--teal);
  padding: 18px 18px 20px;
  transition: transform 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-about .era:hover {
  transform: translateX(2px);
}

.page-about .era--now {
  background: var(--teal);
  border-left-color: var(--cyan);
}

.page-about .era__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--orange-deep);
}

.page-about .era--now .era__year {
  color: var(--cyan);
}

.page-about .era__title {
  margin: 8px 0 10px;
  font-family: var(--font-display);
  font-size: clamp(20px, 3vw, 27px);
  font-weight: 700;
  line-height: 1.24;
  color: var(--teal);
}

.page-about .era--now .era__title {
  color: var(--sand);
}

.page-about .era__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

.page-about .era--now .era__text {
  color: rgba(233, 220, 198, 0.86);
}

.page-about .era__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 14px;
}

.page-about .era__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 3px 8px;
  color: var(--teal);
  background: rgba(11, 58, 60, 0.09);
  border: 1px solid rgba(11, 58, 60, 0.18);
}

.page-about .era--now .era__tag {
  color: var(--cyan);
  background: rgba(18, 201, 180, 0.12);
  border-color: rgba(18, 201, 180, 0.34);
}

@media (min-width: 900px) {
  .page-about .about-archive {
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }
  .page-about .about-archive__rail {
    position: sticky;
    top: 96px;
  }
  .page-about .year-index {
    display: block;
    overflow: visible;
    border-left: 1px solid var(--line);
    padding-bottom: 0;
  }
  .page-about .year-index__item + .year-index__item {
    margin-top: 2px;
  }
  .page-about .year-index__link {
    position: relative;
    border: 0;
    background: transparent;
    padding: 9px 12px;
  }
  .page-about .year-index__link::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 6px;
    bottom: 6px;
    width: 2px;
    background: transparent;
    transition: background-color 180ms var(--ease);
  }
  .page-about .year-index__link.is-active {
    background: transparent;
  }
  .page-about .year-index__link.is-active::before {
    background: var(--cyan);
  }
  .page-about .year-index__link.is-active .year-index__num {
    color: var(--teal);
    font-size: 15px;
  }
  .page-about .year-index__link.is-active .year-index__label {
    color: var(--orange-deep);
  }
  .page-about .about-archive__body {
    position: relative;
    padding-left: 26px;
  }
  .page-about .about-archive__body::before {
    content: "";
    position: absolute;
    left: 7px;
    top: 10px;
    bottom: 10px;
    width: 1px;
    background: linear-gradient(
      180deg,
      var(--cyan) 0%,
      var(--about-teal-line) 42%,
      rgba(20, 18, 15, 0.1) 100%
    );
  }
  .page-about .era {
    border-left-width: 1px;
    width: 62%;
  }
  .page-about .era::before {
    content: "";
    position: absolute;
    left: -24px;
    top: 26px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--sand);
    border: 2px solid var(--teal);
  }
  .page-about .era--now::before {
    border-color: var(--orange);
    background: var(--orange);
  }
  .page-about .era:nth-child(2) {
    width: 70%;
  }
  .page-about .era:nth-child(3) {
    width: 79%;
  }
  .page-about .era:nth-child(4) {
    width: 88%;
  }
  .page-about .era:nth-child(5) {
    width: 100%;
  }
}

/* ---------- 团队构成 ---------- */
.page-about .about-block--team {
  background: linear-gradient(
    180deg,
    rgba(211, 195, 166, 0.28) 0%,
    rgba(233, 220, 198, 0) 100%
  );
}

.page-about .team-bar {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 32px;
}

.page-about .team-seg {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  column-gap: 12px;
  row-gap: 4px;
  padding: 14px 16px;
  color: var(--sand);
  background: var(--teal);
  transition: background-color 200ms var(--ease);
}

.page-about .team-seg__num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
}

.page-about .team-seg__name {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.page-about .team-seg__role {
  grid-column: 1 / -1;
  font-size: 12.5px;
  line-height: 1.6;
  color: rgba(233, 220, 198, 0.78);
}

.page-about .team-seg--ticket {
  background: #0f4d4f;
}

.page-about .team-seg--edit {
  background: var(--orange-deep);
  color: #fff;
}

.page-about .team-seg--edit .team-seg__role {
  color: rgba(255, 255, 255, 0.84);
}

.page-about .team-seg--ops {
  background: var(--sand-deep);
  color: var(--ink);
  border: 1px solid var(--line);
}

.page-about .team-seg--ops .team-seg__role {
  color: var(--about-ink-mute);
}

.page-about .team-note {
  margin: 20px 0 0;
  max-width: 58em;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

.page-about .team-note .text-link {
  color: var(--orange-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

@media (min-width: 860px) {
  .page-about .team-bar {
    flex-direction: row;
    gap: 6px;
    align-items: stretch;
  }
  .page-about .team-seg {
    flex: var(--span, 1) 1 0;
    min-width: 0;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    gap: 8px;
    min-height: 168px;
    padding: 16px;
  }
  .page-about .team-seg__num {
    font-size: 34px;
  }
  .page-about .team-seg__role {
    margin-top: 2px;
  }
  .page-about .team-seg--data {
    --span: 18;
  }
  .page-about .team-seg--ticket {
    --span: 12;
  }
  .page-about .team-seg--edit {
    --span: 11;
  }
  .page-about .team-seg--ops {
    --span: 7;
  }
}

/* ---------- 上线流程 ---------- */
.page-about .flow-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 32px;
}

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

.page-about .flow-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--line);
  filter: saturate(0.8) contrast(1.04);
}

.page-about .flow-figure figcaption {
  margin-top: 10px;
  padding-left: 12px;
  border-left: 3px solid var(--cyan);
  font-size: 12.5px;
  line-height: 1.66;
  color: var(--about-ink-mute);
}

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

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

.page-about .flow__node {
  height: 100%;
  background: var(--sand-deep);
  border: 1px solid var(--line-soft);
}

.page-about .flow__summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .flow__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--orange-deep);
}

.page-about .flow__node[open] .flow__summary::after {
  content: "–";
}

.page-about .flow__num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  padding: 3px 7px;
  color: var(--teal);
  background: rgba(18, 201, 180, 0.24);
}

.page-about .flow__title {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--teal);
  letter-spacing: 0.02em;
}

.page-about .flow__body {
  padding: 0 16px 16px;
  font-size: 14px;
  line-height: 1.76;
  color: var(--about-ink-soft);
}

.page-about .flow__body p {
  margin: 0;
}

.page-about .flow__summary:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: -2px;
}

@media (min-width: 860px) {
  .page-about .flow-layout {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    gap: 40px;
    align-items: start;
  }
  .page-about .flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0;
  }
  .page-about .flow__step {
    padding: 22px 14px 0 0;
  }
  .page-about .flow__step::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    border-top: 1px dashed var(--about-teal-line);
  }
  .page-about .flow__step:nth-child(odd) {
    padding-left: 0;
  }
}

@media (min-width: 1100px) {
  .page-about .flow-layout {
    grid-template-columns: minmax(0, 0.72fr) minmax(0, 1.28fr);
  }
  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .flow__step {
    padding-right: 10px;
  }
}

/* ---------- 服务区域深青带 ---------- */
.page-about .about-coverage {
  position: relative;
  overflow: hidden;
  background: var(--night);
  color: var(--sand);
  padding: clamp(44px, 7vw, 84px) 0;
}

.page-about .about-coverage__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.14;
  filter: grayscale(0.4) contrast(1.1);
}

.page-about .about-coverage__inner {
  position: relative;
  z-index: 1;
}

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

.page-about .about-coverage__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 4.6vw, 42px);
  font-weight: 800;
  line-height: 1.14;
  color: var(--sand);
}

.page-about .about-coverage__text {
  margin: 16px 0 0;
  max-width: 52em;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(233, 220, 198, 0.8);
}

.page-about .coverage-facts {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 30px 0 0;
  background: rgba(233, 220, 198, 0.16);
  border: 1px solid rgba(233, 220, 198, 0.16);
}

.page-about .coverage-fact {
  background: rgba(6, 33, 31, 0.86);
  padding: 14px 16px;
}

.page-about .coverage-fact dt {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: rgba(233, 220, 198, 0.6);
}

.page-about .coverage-fact dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--cyan);
}

@media (min-width: 700px) {
  .page-about .coverage-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1040px) {
  .page-about .about-coverage__inner {
    display: grid;
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 48px;
    align-items: start;
  }
  .page-about .coverage-facts {
    margin-top: 0;
  }
}

/* ---------- 资质 ---------- */
.page-about .compliance-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 32px;
}

.page-about .compliance-card {
  padding: 18px 18px 20px;
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid var(--line);
  border-top: 3px solid var(--teal);
}

.page-about .compliance-card:nth-child(2) {
  border-top-color: var(--orange);
}

.page-about .compliance-card:nth-child(3) {
  border-top-color: var(--cyan);
}

.page-about .compliance-card:nth-child(4) {
  border-top-color: var(--sand-deep);
}

.page-about .compliance-card__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--about-ink-mute);
}

.page-about .compliance-card__title {
  margin: 8px 0 10px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--teal);
}

.page-about .compliance-card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.76;
  color: var(--about-ink-soft);
}

@media (min-width: 760px) {
  .page-about .compliance-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1160px) {
  .page-about .compliance-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 收尾行动 ---------- */
.page-about .about-cta {
  padding: 0 0 clamp(44px, 7vw, 84px);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  padding: clamp(24px, 4vw, 40px);
  background: var(--teal);
  border-left: 5px solid var(--orange);
}

.page-about .about-cta__label {
  margin: 0 0 10px;
  color: var(--cyan);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 800;
  line-height: 1.16;
  color: var(--sand);
}

.page-about .about-cta__text {
  margin: 12px 0 0;
  max-width: 48em;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(233, 220, 198, 0.82);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-cta__actions .btn {
  text-decoration: none;
}

@media (min-width: 860px) {
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 32px;
  }
  .page-about .about-cta__actions {
    flex-direction: column;
    align-items: stretch;
    min-width: 180px;
  }
  .page-about .about-cta__actions .btn {
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .era,
  .page-about .year-index__link,
  .page-about .team-seg {
    transition: none;
  }
  .page-about .era:hover {
    transform: none;
  }
}
<<<END>>>