.page-about {
  background: var(--cream);
  color: var(--ink);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: 20px;
}
.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--grey);
}
.page-about .breadcrumb li {
  display: flex;
  align-items: center;
  gap: 8px;
}
.page-about .breadcrumb li + li::before {
  content: "/";
  color: var(--mist);
}
.page-about .breadcrumb a {
  color: var(--indigo);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.page-about .breadcrumb a:hover {
  color: var(--apricot);
  border-color: var(--apricot);
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--grey);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: 32px;
}
.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
  align-items: start;
}
.page-about .about-hero__coord {
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-width: 0;
}
.page-about .about-hero__fig {
  position: relative;
  margin: 0;
  border: 1px solid var(--mist);
  background: var(--indigo);
  overflow: hidden;
}
.page-about .about-hero__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}
.page-about .about-hero__cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px;
  padding: 9px 14px;
  background: rgba(20, 31, 56, 0.86);
  color: var(--cream);
  font-size: 11px;
  letter-spacing: 0.04em;
}
.page-about .about-hero__cap .mono {
  color: var(--gold);
  font-family: var(--font-mono);
}

.page-about .about-coord {
  margin: 0;
  border-top: 1px solid var(--mist);
}
.page-about .about-coord__row {
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr);
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px solid var(--mist);
  font-size: 13px;
  line-height: 1.6;
}
.page-about .about-coord__row dt {
  color: var(--grey);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  padding-top: 2px;
}
.page-about .about-coord__row dd {
  margin: 0;
  color: var(--ink);
  font-weight: 500;
  word-break: break-word;
}
.page-about .about-coord__row dd.mono {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 12px;
}

.page-about .about-hero__body {
  min-width: 0;
}
.page-about .about-hero__body .eyebrow {
  display: inline-block;
  margin: 0 0 18px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--apricot);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--apricot);
}
.page-about .about-hero__body h1 {
  margin: 0 0 20px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(30px, 5.4vw, 58px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--indigo);
}
.page-about .about-hero__lead {
  margin: 0 0 18px;
  font-size: clamp(16px, 1.7vw, 19px);
  line-height: 1.8;
  font-weight: 500;
  color: var(--indigo-700);
}
.page-about .about-hero__text {
  margin: 0 0 30px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--grey);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--mist);
  border: 1px solid var(--mist);
}
.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 14px;
  background: var(--paper);
}
.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 3vw, 26px);
  font-weight: 600;
  line-height: 1;
  color: var(--apricot);
}
.page-about .about-stat__label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--grey);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  padding-top: 64px;
}
.page-about .about-body__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
  align-items: start;
}
.page-about .about-rail {
  min-width: 0;
}
.page-about .about-rail__title {
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--mist);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--grey);
}
.page-about .about-rail__nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
}
.page-about .about-rail__link {
  flex: 0 0 auto;
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 12px;
  border: 1px solid var(--mist);
  background: var(--paper);
  font-size: 13px;
  color: var(--grey);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.page-about .about-rail__link:hover {
  color: var(--indigo);
  border-color: var(--indigo-500);
}
.page-about .about-rail__link[aria-current="true"] {
  color: var(--apricot);
  border-color: var(--apricot);
}
.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  opacity: 0.75;
}

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

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding: 40px 0;
  border-top: 1px solid var(--mist);
}
.page-about .about-sec:first-child {
  padding-top: 0;
  border-top: 0;
}
.page-about .about-sec__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 14px;
}
.page-about .about-sec__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--apricot);
}
.page-about .about-sec__title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(22px, 3.2vw, 32px);
  line-height: 1.28;
  color: var(--indigo);
}
.page-about .about-sec__lead {
  max-width: 62ch;
  margin: 0 0 28px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--grey);
}
.page-about .about-sec__foot {
  margin: 26px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--grey);
}
.page-about .about-sec__foot a {
  color: var(--indigo);
  text-decoration: none;
  border-bottom: 1px solid var(--apricot);
  padding-bottom: 1px;
  transition: color 0.2s var(--ease);
}
.page-about .about-sec__foot a:hover {
  color: var(--apricot);
}

/* 01 服务内容 */
.page-about .about-cards {
  border-top: 1px solid var(--mist);
}
.page-about .about-cards__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 22px 0;
  border-bottom: 1px solid var(--mist);
}
.page-about .about-cards__name {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 600;
  color: var(--indigo);
  letter-spacing: 0.01em;
}
.page-about .about-cards__body {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--grey);
}

/* 02 版本 —— 深色模块 */
.page-about .about-sec--dark {
  margin: 10px 0;
  padding: 36px 20px;
  border-top: 0;
  background: var(--indigo);
  color: var(--cream);
  border-left: 3px solid var(--apricot);
}
.page-about .about-sec--dark .about-sec__title {
  color: var(--cream);
}
.page-about .about-sec--dark .about-sec__lead {
  color: var(--mist);
}
.page-about .about-ver-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}
.page-about .about-timeline {
  border-left: 1px solid rgba(201, 210, 224, 0.26);
  margin-left: 6px;
}
.page-about .about-timeline .accordion__item {
  position: relative;
  border-bottom: 1px solid rgba(201, 210, 224, 0.16);
}
.page-about .about-timeline .accordion__item::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 27px;
  width: 11px;
  height: 11px;
  background: var(--indigo);
  border: 1px solid var(--gold);
  transform: rotate(45deg);
}
.page-about .about-timeline .accordion__item:last-child {
  border-bottom: 0;
}
.page-about .about-timeline .accordion__trigger {
  width: 100%;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding: 20px 0 20px 16px;
  background: none;
  border: 0;
  color: var(--cream);
  font-family: var(--font-sans);
  font-size: 16px;
  text-align: left;
  cursor: pointer;
  border-radius: 0;
}
.page-about .about-timeline .accordion__trigger:hover .about-tl__title {
  color: var(--apricot);
}
.page-about .about-timeline .accordion__trigger:focus-visible {
  outline: 2px solid var(--apricot);
  outline-offset: 2px;
}
.page-about .about-tl__stage {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
}
.page-about .about-tl__title {
  font-weight: 600;
  transition: color 0.2s var(--ease);
}
.page-about .about-timeline .accordion__icon {
  margin-left: auto;
  align-self: center;
  width: 8px;
  height: 8px;
  border-right: 1px solid var(--mist);
  border-bottom: 1px solid var(--mist);
  transform: rotate(45deg);
  transition: transform 0.2s var(--ease);
}
.page-about .about-timeline .accordion__trigger[aria-expanded="true"] .accordion__icon {
  transform: rotate(-135deg);
}
.page-about .about-timeline .accordion__panel {
  padding: 0 0 24px 16px;
}
.page-about .about-timeline .accordion__panel p {
  margin: 0;
  max-width: 58ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}
.page-about .about-ver__fig {
  margin: 0;
  border: 1px solid rgba(201, 210, 224, 0.26);
}
.page-about .about-ver__fig img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 420px;
  aspect-ratio: 9 / 14;
  object-fit: cover;
}
.page-about .about-ver__cap {
  padding: 9px 12px;
  border-top: 1px solid rgba(201, 210, 224, 0.26);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
}

/* 03 内容规模 */
.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--mist);
  border: 1px solid var(--mist);
  margin-bottom: 28px;
}
.page-about .about-metric {
  padding: 20px 16px;
  background: var(--paper);
}
.page-about .about-metric__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(21px, 3.2vw, 30px);
  font-weight: 600;
  line-height: 1.05;
  color: var(--indigo);
}
.page-about .about-metric__num em {
  font-style: normal;
  font-size: 0.55em;
  color: var(--apricot);
  letter-spacing: 0.04em;
}
.page-about .about-metric__label {
  display: block;
  margin-top: 9px;
  font-size: 12px;
  line-height: 1.55;
  color: var(--grey);
}
.page-about .about-prose p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--grey);
}
.page-about .about-prose p:last-child {
  margin-bottom: 0;
}

/* 04 团队分工 */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--mist);
  border: 1px solid var(--mist);
}
.page-about .about-team__col {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px 20px;
  background: var(--sand);
}
.page-about .about-team__scope {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--apricot);
}
.page-about .about-team__name {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--indigo);
}
.page-about .about-team__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.page-about .about-team__list li {
  position: relative;
  padding-left: 15px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--grey);
}
.page-about .about-team__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 1px;
  background: var(--apricot);
}
.page-about .about-team-fig {
  margin: 28px 0 0;
  border: 1px solid var(--mist);
  background: var(--paper);
}
.page-about .about-team-fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}
.page-about .about-team__cap {
  padding: 10px 14px;
  border-top: 1px solid var(--mist);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--grey);
}

/* 05 更新节奏 */
.page-about .about-cadence {
  border-top: 1px solid var(--mist);
}
.page-about .about-cadence__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--mist);
}
.page-about .about-cadence__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--apricot);
}
.page-about .about-cadence__val {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--grey);
}

/* 06 备案与联络 */
.page-about .about-end {
  margin-top: 64px;
  padding: 52px 0 60px;
  background: var(--indigo);
  color: var(--cream);
}
.page-about .about-end__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
  align-items: start;
}
.page-about .about-end__eyebrow {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gold);
}
.page-about .about-end h2 {
  margin: 0 0 16px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.3;
  color: var(--cream);
}
.page-about .about-end p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}
.page-about .about-end p a {
  color: var(--cream);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 210, 224, 0.5);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.page-about .about-end p a:hover {
  color: var(--apricot);
  border-color: var(--apricot);
}
.page-about .about-end__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid rgba(201, 210, 224, 0.24);
}
.page-about .about-end__list li {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid rgba(201, 210, 224, 0.24);
}
.page-about .about-end__key {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
}
.page-about .about-end__val {
  font-size: 14px;
  line-height: 1.7;
  color: var(--cream);
  word-break: break-word;
}
.page-about .about-end__val.mono {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}
.page-about .copy-btn {
  margin-left: 10px;
  padding: 4px 10px;
  vertical-align: middle;
  background: transparent;
  border: 1px solid rgba(201, 210, 224, 0.4);
  border-radius: 0;
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.page-about .copy-btn:hover {
  color: var(--apricot);
  border-color: var(--apricot);
}
.page-about .copy-btn:focus-visible {
  outline: 2px solid var(--apricot);
  outline-offset: 2px;
}
.page-about .copy-btn[data-copied="true"] {
  color: var(--apricot);
  border-color: var(--apricot);
}

/* ---------- 桌面端 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 54px;
  }
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-cards__item {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 26px;
    align-items: start;
  }
  .page-about .about-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-cadence__row {
    grid-template-columns: 118px minmax(0, 1fr);
    gap: 28px;
    align-items: baseline;
  }
  .page-about .about-end__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 60px;
  }
  .page-about .about-sec--dark {
    padding: 48px 40px;
  }
  .page-about .about-ver-grid {
    grid-template-columns: minmax(0, 1fr) 236px;
    gap: 44px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    padding-top: 88px;
  }
  .page-about .about-body__grid {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: 68px;
  }
  .page-about .about-rail {
    position: sticky;
    top: 132px;
  }
  .page-about .about-rail__nav {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--mist);
  }
  .page-about .about-rail__link {
    border: 0;
    border-left: 2px solid transparent;
    margin-left: -1px;
    background: transparent;
    padding: 10px 0 10px 14px;
  }
  .page-about .about-rail__link:hover {
    border-color: transparent;
    border-left-color: var(--indigo-500);
  }
  .page-about .about-rail__link[aria-current="true"] {
    border-color: transparent;
    border-left-color: var(--apricot);
    font-weight: 600;
  }
}

@media (min-width: 1200px) {
  .page-about .about-sec {
    padding: 52px 0;
  }
  .page-about .about-hero__body .eyebrow {
    margin-bottom: 22px;
  }
}
<<<END>>>