.page-about {
  --about-rail: 208px;
  padding-bottom: clamp(2.5rem, 6vw, 5rem);
}

.page-about .crumbs {
  padding-top: clamp(1rem, 2.4vw, 1.6rem);
}

.page-about .crumbs a {
  color: inherit;
  text-decoration: none;
}

.page-about .crumbs a:hover {
  color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-about .about-lead {
  position: relative;
  padding: clamp(1.1rem, 3vw, 1.8rem) 0 clamp(1.6rem, 4vw, 2.6rem);
  border-bottom: var(--hair);
}

.page-about .about-lead::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: min(200px, 46%);
  height: 2px;
  background: linear-gradient(90deg, var(--orange), rgba(255, 90, 31, 0));
}

.page-about .about-lead__kicker {
  margin: 0 0 0.7rem;
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-about .about-lead__title {
  margin: 0 0 1rem;
  font-size: clamp(1.85rem, 5.4vw, 3.3rem);
  line-height: 1.14;
  font-weight: 800;
  color: var(--paper);
  max-width: 20ch;
}

.page-about .about-lead__note {
  margin: 0;
  max-width: 64ch;
  color: var(--mist);
  font-size: clamp(0.92rem, 1.6vw, 1rem);
  line-height: 1.85;
}

.page-about .about-stats {
  list-style: none;
  margin: 1.9rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: var(--hair);
  border-left: var(--hair);
}

.page-about .about-stats li {
  padding: 0.85rem 0.95rem;
  border-right: var(--hair);
  border-bottom: var(--hair);
  background: linear-gradient(160deg, rgba(18, 38, 77, 0.55), rgba(5, 11, 26, 0));
}

.page-about .about-stats b {
  display: block;
  font-family: var(--mono);
  font-size: clamp(1.2rem, 3.6vw, 1.85rem);
  line-height: 1.1;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
}

.page-about .about-stats span {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.74rem;
  letter-spacing: 0.07em;
  color: var(--mist);
}

@media (min-width: 600px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 980px) {
  .page-about .about-stats {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(1.2rem, 3vw, 2rem);
  padding-top: clamp(1.6rem, 4vw, 2.6rem);
}

@media (min-width: 980px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(1.8rem, 3.6vw, 3.2rem);
    align-items: start;
  }
}

/* ---------- 左侧索引 ---------- */
.page-about .about-rail__head {
  margin: 0 0 0.55rem;
  font-size: 0.66rem;
  letter-spacing: 0.24em;
  color: var(--cyan);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0.35rem;
  display: flex;
  gap: 0.4rem;
  overflow-x: auto;
  scrollbar-width: thin;
}

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

.page-about .about-rail__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  padding: 0.42rem 0.7rem;
  border: var(--hair);
  background: rgba(10, 22, 48, 0.6);
  color: var(--mist);
  font-size: 0.82rem;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--paper);
  border-color: var(--cyan);
  background: rgba(18, 38, 77, 0.85);
}

.page-about .about-rail__num {
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

@media (min-width: 980px) {
  .page-about .about-rail {
    position: sticky;
    top: 96px;
  }

  .page-about .about-rail__list {
    display: block;
    overflow: visible;
    padding: 0;
    border-left: 1px solid var(--line-soft);
  }

  .page-about .about-rail__list a {
    display: flex;
    border: 0;
    border-radius: 0;
    background: none;
    padding: 0.42rem 0 0.42rem 0.9rem;
    position: relative;
  }

  .page-about .about-rail__list a::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 50%;
    width: 1px;
    height: 0;
    background: var(--orange);
    transition: height 0.22s var(--ease), width 0.22s var(--ease);
  }

  .page-about .about-rail__list a:hover::before,
  .page-about .about-rail__list a:focus-visible::before {
    width: 3px;
    height: 100%;
    transform: translateY(-50%);
  }
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  scroll-margin-top: 104px;
  padding-top: clamp(1.6rem, 4vw, 2.6rem);
}

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

.page-about .about-sec + .about-sec {
  margin-top: clamp(1.4rem, 3.6vw, 2.4rem);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-sec__head {
  display: grid;
  gap: 0.55rem;
  margin-bottom: clamp(1rem, 2.4vw, 1.5rem);
}

.page-about .about-sec__idx {
  margin: 0;
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  color: var(--orange);
}

.page-about .about-sec__title {
  margin: 0;
  font-size: clamp(1.28rem, 3.2vw, 1.95rem);
  line-height: 1.28;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-sec__note {
  margin: 0;
  max-width: 66ch;
  color: var(--mist);
  font-size: 0.92rem;
  line-height: 1.85;
}

/* ---------- 层叠档案卡 ---------- */
.page-about .about-files {
  display: grid;
  gap: 1rem;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .dossier {
  position: relative;
  padding: var(--pad);
  border: var(--hair);
  background: linear-gradient(155deg, var(--blue-800), var(--blue-900) 72%);
  box-shadow: 5px 5px 0 rgba(18, 38, 77, 0.55), 10px 10px 0 rgba(5, 11, 26, 0.55);
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .dossier:hover {
  transform: translate(-2px, -2px);
  border-color: var(--cyan);
  box-shadow: 7px 7px 0 rgba(18, 38, 77, 0.7), 14px 14px 0 rgba(5, 11, 26, 0.6);
}

.page-about .dossier__label {
  display: inline-block;
  margin-bottom: 0.7rem;
  padding: 0.22rem 0.5rem;
  border: 1px solid rgba(255, 90, 31, 0.75);
  color: var(--orange-soft);
  font-size: 0.64rem;
  letter-spacing: 0.16em;
}

.page-about .dossier h3 {
  margin: 0 0 0.5rem;
  font-size: 1.02rem;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .dossier p {
  margin: 0;
  color: var(--mist);
  font-size: 0.88rem;
  line-height: 1.82;
}

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

  .page-about .dossier--wide {
    grid-column: 1 / -1;
  }
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  position: relative;
  margin: 1.2rem 0 0;
  border: var(--hair);
  background: var(--blue-900);
  overflow: hidden;
}

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

.page-about .about-figure figcaption {
  padding: 0.55rem 0.8rem;
  border-top: 1px solid var(--line-soft);
  color: var(--mist);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
}

.page-about .about-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(118deg, rgba(34, 211, 238, 0.09), rgba(34, 211, 238, 0) 46%);
}

@media (min-width: 900px) {
  .page-about .about-figure--wide {
    margin-top: 1.5rem;
  }
}

/* ---------- 更新流程 ---------- */
.page-about .relay__ticks {
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.page-about .relay__ticks li {
  padding: 0.2rem 0.55rem;
  border: 1px solid var(--line);
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
}

.page-about .relay {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .relay__step {
  position: relative;
  padding: 1.15rem 1rem 1rem;
  border: var(--hair);
  background: rgba(10, 22, 48, 0.72);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .relay__step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 40%;
  height: 2px;
  background: linear-gradient(90deg, var(--orange), rgba(255, 90, 31, 0));
}

.page-about .relay__step:hover {
  border-color: var(--cyan);
  background: rgba(18, 38, 77, 0.7);
}

.page-about .relay__num {
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .relay__step h3 {
  margin: 0.35rem 0 0.4rem;
  font-size: 0.98rem;
  color: var(--paper);
}

.page-about .relay__step p {
  margin: 0;
  color: var(--mist);
  font-size: 0.86rem;
  line-height: 1.78;
}

@media (min-width: 820px) {
  .page-about .relay {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.9rem;
  }
}

/* ---------- 多端分工 ---------- */
.page-about .devices {
  display: grid;
  gap: 0.9rem;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .device {
  padding: 1.15rem 1.05rem;
  border: var(--hair);
  background: linear-gradient(180deg, rgba(18, 38, 77, 0.7), rgba(5, 11, 26, 0.92));
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .device:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
}

.page-about .device--primary {
  border-color: rgba(255, 90, 31, 0.85);
  box-shadow: inset 0 0 0 1px rgba(255, 90, 31, 0.2);
}

.page-about .device__ver {
  margin: 0;
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .device--primary .device__ver {
  color: var(--orange-soft);
}

.page-about .device h3 {
  margin: 0.45rem 0 0.5rem;
  font-size: 1rem;
  color: var(--paper);
}

.page-about .device p {
  margin: 0 0 0.8rem;
  color: var(--mist);
  font-size: 0.87rem;
  line-height: 1.76;
}

.page-about .device ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.4rem;
}

.page-about .device li {
  position: relative;
  padding-left: 0.95rem;
  color: var(--mist);
  font-size: 0.82rem;
  line-height: 1.65;
}

.page-about .device li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 5px;
  height: 5px;
  background: var(--cyan);
}

.page-about .device--primary li::before {
  background: var(--orange);
}

@media (min-width: 780px) {
  .page-about .devices {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 文本链接 ---------- */
.page-about .about-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: 1.1rem;
  padding-bottom: 0.15rem;
  border-bottom: 1px solid rgba(255, 138, 76, 0.5);
  color: var(--orange-soft);
  font-size: 0.85rem;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

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

/* ---------- 团队与协作 ---------- */
.page-about .crew {
  display: grid;
  gap: 0.9rem;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .crew__card {
  padding: 1rem 1.05rem;
  border: var(--hair);
  background: rgba(10, 22, 48, 0.78);
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .crew__card:hover,
.page-about .crew__card:focus-within {
  transform: translateY(-2px);
  border-color: var(--cyan);
  background: rgba(18, 38, 77, 0.85);
}

.page-about .crew__card--partner {
  background: rgba(5, 11, 26, 0.8);
  border-style: dashed;
}

.page-about .crew__num {
  margin: 0;
  font-family: var(--mono);
  font-size: 1.55rem;
  line-height: 1.05;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .crew__card--partner .crew__num {
  color: var(--cyan);
}

.page-about .crew__num small {
  margin-left: 0.28rem;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .crew__card h3 {
  margin: 0.45rem 0 0.45rem;
  font-size: 0.95rem;
  color: var(--paper);
}

.page-about .crew__card > p {
  margin: 0;
  color: var(--mist);
  font-size: 0.85rem;
  line-height: 1.75;
}

.page-about .crew__card .crew__more {
  margin-top: 0.7rem;
  padding-top: 0.65rem;
  border-top: 1px dashed var(--line-soft);
  font-size: 0.8rem;
  line-height: 1.72;
  color: var(--mist);
}

@media (hover: hover) and (min-width: 1000px) {
  .page-about .crew__card .crew__more {
    max-height: 0;
    padding-top: 0;
    margin-top: 0;
    border-top-color: transparent;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.28s var(--ease), opacity 0.22s var(--ease), margin-top 0.22s var(--ease), padding-top 0.22s var(--ease);
  }

  .page-about .crew__card:hover .crew__more,
  .page-about .crew__card:focus-within .crew__more {
    max-height: 9rem;
    margin-top: 0.7rem;
    padding-top: 0.65rem;
    border-top-color: var(--line-soft);
    opacity: 1;
  }
}

.page-about .team-note {
  margin-top: 1.1rem;
  padding: 1rem 1.05rem;
  border-left: 2px solid var(--orange);
  background: linear-gradient(90deg, rgba(18, 38, 77, 0.65), rgba(5, 11, 26, 0));
}

.page-about .team-note__text {
  margin: 0;
  max-width: 62ch;
  color: var(--mist);
  font-size: 0.88rem;
  line-height: 1.8;
}

.page-about .team-note .about-link {
  margin-top: 0.75rem;
}

@media (min-width: 640px) {
  .page-about .crew {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1020px) {
  .page-about .crew {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 时间线 ---------- */
.page-about .timeline-wrap {
  display: grid;
  gap: 1.3rem;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .timeline-main {
  min-width: 0;
}

.page-about .timeline-main .filter-bar {
  flex-wrap: wrap;
  gap: 0.4rem;
}

.page-about .filter-bar .filter-btn {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
}

.page-about .timeline {
  list-style: none;
  margin: 1.1rem 0 0;
  padding: 0 0 0 1.35rem;
  border-left: 1px solid var(--line-soft);
  display: grid;
  gap: 1.05rem;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -1.35rem;
  top: 0.5rem;
  width: 9px;
  height: 9px;
  margin-left: -5px;
  border: 1px solid var(--cyan);
  border-radius: 50%;
  background: var(--blue-900);
}

.page-about .timeline__item[data-tags~="renew"]::before {
  border-color: var(--orange);
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 90, 31, 0.16);
}

.page-about .timeline__stage {
  margin: 0 0 0.3rem;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .timeline__item h3 {
  margin: 0 0 0.35rem;
  font-size: 0.98rem;
  color: var(--paper);
}

.page-about .timeline__item p {
  margin: 0;
  color: var(--mist);
  font-size: 0.87rem;
  line-height: 1.78;
}

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

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

@media (min-width: 980px) {
  .page-about .timeline-wrap {
    grid-template-columns: minmax(0, 1fr) 232px;
    gap: 1.6rem;
    align-items: start;
  }

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

/* ---------- 服务准则 ---------- */
.page-about .principles {
  display: grid;
  gap: 0.9rem;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .principle {
  padding: 1rem 1.05rem;
  border-top: 2px solid var(--orange);
  background: rgba(10, 22, 48, 0.72);
}

.page-about .principle:nth-child(2) {
  border-top-color: var(--cyan);
}

.page-about .principle:nth-child(3) {
  border-top-color: var(--orange-soft);
}

.page-about .principle h3 {
  margin: 0 0 0.45rem;
  font-size: 0.98rem;
  color: var(--paper);
}

.page-about .principle p {
  margin: 0;
  color: var(--mist);
  font-size: 0.86rem;
  line-height: 1.78;
}

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

.page-about .about-cta {
  margin-top: 1.3rem;
  padding: clamp(1.1rem, 2.6vw, 1.6rem);
  border: 1px solid var(--line);
  background:
    linear-gradient(120deg, rgba(255, 90, 31, 0.1), rgba(34, 211, 238, 0.06) 55%, rgba(5, 11, 26, 0)),
    rgba(10, 22, 48, 0.7);
}

.page-about .about-cta__text {
  margin: 0 0 1rem;
  max-width: 60ch;
  color: var(--mist);
  font-size: 0.88rem;
  line-height: 1.8;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.page-about .about-cta__actions .btn {
  font-size: 0.85rem;
}
<<<END>>>