.page-about {
  --about-gap: clamp(1rem, 3vw, 2rem);
  --about-rail: 118px;
  --about-pad: clamp(1.25rem, 3.5vw, 2.5rem);
}

.page-about .about-crumbbar {
  padding-block: clamp(1rem, 2.5vw, 1.6rem) 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(1.75rem, 5vw, 3.5rem) clamp(2.25rem, 5vw, 4rem);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(31, 78, 110, 0.55), transparent 62%),
    linear-gradient(180deg, var(--ink-deep), var(--ink));
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__inner {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.05rem, 6.4vw, 3.5rem);
  line-height: 1.06;
  letter-spacing: -0.012em;
  margin: 0.45rem 0 0;
  color: var(--mist);
  text-wrap: balance;
}

.page-about .about-hero__lead {
  margin-top: 1rem;
  max-width: 48ch;
  color: rgba(244, 241, 234, 0.82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.5rem;
}

.page-about .about-board {
  position: relative;
  overflow: hidden;
  padding: clamp(1rem, 3vw, 1.5rem);
  border: 1px solid rgba(201, 163, 92, 0.38);
  border-radius: var(--radius);
  background: linear-gradient(150deg, rgba(31, 78, 110, 0.94), rgba(11, 18, 24, 0.95));
  box-shadow: var(--shadow-sheet);
}

.page-about .about-board::before {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px dashed rgba(244, 241, 234, 0.14);
  pointer-events: none;
}

.page-about .about-board__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.75rem;
  padding-bottom: 0.7rem;
  margin-bottom: 0.8rem;
  border-bottom: 1px solid var(--line);
}

.page-about .about-board__label {
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  color: var(--sand);
}

.page-about .about-board__stamp {
  font-size: 0.72rem;
  color: var(--steel);
}

.page-about .about-board__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.page-about .about-board__row {
  display: grid;
  grid-template-columns: 5.6rem minmax(0, 1fr);
  align-items: center;
  gap: 0.7rem;
}

.page-about .about-board__name {
  font-size: 0.84rem;
  color: var(--mist);
}

.page-about .about-board__bar {
  height: 6px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--sand), rgba(201, 163, 92, 0.22));
  transform-origin: left center;
  animation: about-bar-grow 520ms var(--ease) both;
}

.page-about .about-board__bar--a { width: 94%; animation-delay: 40ms; }
.page-about .about-board__bar--b { width: 78%; animation-delay: 90ms; }
.page-about .about-board__bar--c { width: 62%; animation-delay: 140ms; }
.page-about .about-board__bar--d { width: 83%; animation-delay: 190ms; }
.page-about .about-board__bar--e { width: 54%; animation-delay: 240ms; background: linear-gradient(90deg, var(--pitch), rgba(46, 125, 79, 0.25)); }

.page-about .about-board__foot {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 1rem 0 0;
  font-size: 0.78rem;
  color: rgba(244, 241, 234, 0.72);
}

@keyframes about-bar-grow {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

/* ---------- 共用小标题 ---------- */
.page-about .about-head {
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-head h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.45rem, 4.4vw, 2.25rem);
  line-height: 1.12;
  letter-spacing: -0.008em;
  margin: 0.3rem 0 0;
  color: inherit;
}

.page-about .about-head__note {
  margin: 0.6rem 0 0;
  max-width: 54ch;
  font-size: 0.9rem;
  line-height: 1.7;
  opacity: 0.78;
}

.page-about .about-head--paper { color: var(--ink); }

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  margin-block: clamp(2rem, 5vw, 3.5rem);
  padding: var(--about-pad);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--ink);
  box-shadow: var(--shadow-sheet);
}

.page-about .about-timeline__grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-years__title {
  margin: 0 0 0.6rem;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--bronze);
}

.page-about .about-years ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.page-about .about-years a {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  padding: 0.3rem 0.55rem;
  font-size: 0.84rem;
  color: var(--ink);
  text-decoration: none;
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius) var(--radius) 0;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-years a .mono {
  font-size: 0.78rem;
  color: var(--bronze);
}

.page-about .about-years a:hover,
.page-about .about-years a:focus-visible {
  border-left-color: var(--orange);
  background: rgba(201, 163, 92, 0.16);
}

.page-about .about-track {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
  position: relative;
}

.page-about .about-stop {
  scroll-margin-top: 1.5rem;
  padding: clamp(0.9rem, 2.5vw, 1.35rem);
  border: 1px solid rgba(16, 24, 32, 0.14);
  border-left: 4px solid var(--sand);
  border-radius: var(--radius);
  background: var(--mist);
  box-shadow: 0 12px 26px -22px rgba(16, 24, 32, 0.6);
  transition: border-left-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-stop:hover { border-left-color: var(--orange); }

.page-about .about-stop__head {
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.page-about .about-stop__badge {
  display: inline-block;
  padding: 0.16rem 0.55rem;
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--sand);
  background: var(--ink);
  border-radius: var(--radius);
}

.page-about .about-stop__note {
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--bronze);
}

.page-about .about-stop h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.02rem, 2.6vw, 1.28rem);
  line-height: 1.28;
  margin: 0.55rem 0 0.35rem;
  color: var(--ink);
}

.page-about .about-stop p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: rgba(16, 24, 32, 0.82);
}

/* ---------- 旧版 / 新版 ---------- */
.page-about .about-versions {
  margin-block: clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-versions__grid {
  display: grid;
  gap: 0;
}

.page-about .about-version {
  padding: clamp(1rem, 3vw, 1.6rem);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(31, 78, 110, 0.28);
}

.page-about .about-version--legacy {
  background: rgba(244, 241, 234, 0.05);
  color: rgba(244, 241, 234, 0.7);
}

.page-about .about-version--current {
  border-color: rgba(201, 163, 92, 0.45);
  background: rgba(31, 78, 110, 0.42);
}

.page-about .about-version__tag {
  display: inline-block;
  margin: 0 0 0.65rem;
  padding: 0.12rem 0.5rem;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--sand);
  border: 1px solid rgba(201, 163, 92, 0.42);
  border-radius: var(--radius);
}

.page-about .about-version h3 {
  font-family: var(--font-display);
  font-weight: 800;
  margin: 0 0 0.45rem;
  line-height: 1.25;
  color: var(--mist);
}

.page-about .about-version--legacy h3 {
  font-size: 1rem;
  color: rgba(244, 241, 234, 0.78);
}

.page-about .about-version--current h3 {
  font-size: clamp(1.1rem, 3vw, 1.35rem);
}

.page-about .about-version p {
  margin: 0;
  line-height: 1.7;
}

.page-about .about-version--legacy p {
  font-size: 0.82rem;
  color: rgba(244, 241, 234, 0.66);
}

.page-about .about-version--current p {
  font-size: 0.9rem;
  color: rgba(244, 241, 234, 0.84);
}

.page-about .about-version__link { margin-top: 1rem; }

.page-about .about-version__split {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.45rem 0;
  font-family: var(--font-display);
  font-size: 2.1rem;
  line-height: 1;
  color: var(--sand);
}

.page-about .about-version__split::before,
.page-about .about-version__split::after {
  content: "";
  flex: 1;
  height: 1px;
  background: rgba(201, 163, 92, 0.38);
}

/* ---------- 数据流程 ---------- */
.page-about .about-method {
  margin-block: clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-method__grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-method h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.45rem, 4.4vw, 2.25rem);
  line-height: 1.12;
  margin: 0.3rem 0 0;
  color: var(--mist);
}

.page-about .about-method__intro {
  margin: 0.7rem 0 0;
  font-size: 0.94rem;
  line-height: 1.75;
  color: rgba(244, 241, 234, 0.82);
}

.page-about .about-steps {
  list-style: none;
  margin: 1.25rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 2.1rem minmax(0, 1fr);
  gap: 0.75rem;
  padding: 0.7rem 0.8rem;
  border-left: 2px solid rgba(201, 163, 92, 0.45);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: rgba(31, 78, 110, 0.24);
}

.page-about .about-step__num {
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--orange);
  padding-top: 0.15rem;
}

.page-about .about-step h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1rem;
  margin: 0 0 0.2rem;
  color: var(--mist);
}

.page-about .about-step p {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.68;
  color: rgba(244, 241, 234, 0.76);
}

.page-about .about-method__clock {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.85rem;
  margin: 1.25rem 0 0;
  padding: 0.65rem 0.9rem;
  font-size: 0.82rem;
  color: rgba(244, 241, 234, 0.78);
  border: 1px dashed rgba(201, 163, 92, 0.42);
  border-radius: var(--radius);
}

.page-about .about-method__clock .mono {
  font-size: 0.92rem;
  color: var(--sand);
}

.page-about .about-figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(46, 125, 79, 0.35), rgba(16, 24, 32, 0.9));
}

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

/* ---------- 归档 ---------- */
.page-about .about-archive {
  margin-block: clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-archive__inner {
  display: grid;
  gap: var(--about-gap);
  padding: var(--about-pad);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(140deg, rgba(31, 78, 110, 0.32), rgba(16, 24, 32, 0.7));
}

.page-about .about-archive h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.45rem, 4.4vw, 2.25rem);
  line-height: 1.12;
  margin: 0.3rem 0 0;
  color: var(--mist);
}

.page-about .about-archive p {
  margin: 0.7rem 0 0;
  font-size: 0.93rem;
  line-height: 1.75;
  color: rgba(244, 241, 234, 0.82);
}

.page-about .about-archive__stats {
  list-style: none;
  margin: 1.25rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.55rem;
}

.page-about .about-archive__stats li {
  padding: 0.7rem 0.6rem;
  border: 1px solid var(--line);
  border-top: 2px solid var(--pitch);
  border-radius: var(--radius);
  background: rgba(11, 18, 24, 0.6);
}

.page-about .about-archive__stats .mono {
  display: block;
  font-size: clamp(1.25rem, 4vw, 1.75rem);
  line-height: 1;
  color: var(--sand);
}

.page-about .about-archive__stats em {
  font-style: normal;
  font-size: 0.6em;
  color: var(--orange);
}

.page-about .about-archive__stats small {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: rgba(244, 241, 234, 0.68);
}

.page-about .about-archive__note {
  font-size: 0.84rem;
  color: rgba(244, 241, 234, 0.66);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  margin-block: clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-team__filters { margin-bottom: 1.25rem; }

.page-about .about-team__grid {
  display: grid;
  gap: 0.8rem;
}

.page-about .about-role {
  padding: clamp(0.9rem, 2.5vw, 1.3rem);
  border: 1px solid var(--line);
  border-top: 3px solid var(--sand);
  border-radius: var(--radius);
  background: rgba(31, 78, 110, 0.28);
}

.page-about .about-role:nth-child(2) { border-top-color: var(--pitch); }
.page-about .about-role:nth-child(3) { border-top-color: var(--orange); }

.page-about .about-role__count {
  display: block;
  font-size: 1.85rem;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-role:nth-child(2) .about-role__count { color: var(--pitch); }
.page-about .about-role:nth-child(3) .about-role__count { color: var(--sand); }

.page-about .about-role__count small {
  margin-left: 0.3rem;
  font-family: var(--font-body);
  font-size: 0.7rem;
  color: rgba(244, 241, 234, 0.6);
}

.page-about .about-role h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.12rem;
  margin: 0.55rem 0 0.4rem;
  color: var(--mist);
}

.page-about .about-role p {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.72;
  color: rgba(244, 241, 234, 0.78);
}

/* ---------- 视觉体系 ---------- */
.page-about .about-visual {
  margin-block: clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-visual__banner { margin-bottom: var(--about-gap); }

.page-about .about-visual h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.45rem, 4.4vw, 2.25rem);
  line-height: 1.12;
  margin: 0.3rem 0 0;
  color: var(--mist);
}

.page-about .about-visual__copy p {
  margin: 0.7rem 0 0;
  max-width: 62ch;
  font-size: 0.93rem;
  line-height: 1.78;
  color: rgba(244, 241, 234, 0.82);
}

.page-about .about-swatches {
  list-style: none;
  margin: 1.1rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}

.page-about .about-swatches li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.5rem 0.65rem;
  font-size: 0.82rem;
  color: rgba(244, 241, 234, 0.8);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(16, 24, 32, 0.42);
}

.page-about .about-swatches__chip {
  flex: none;
  width: 1.05rem;
  height: 1.05rem;
  border-radius: 2px;
  border: 1px solid rgba(244, 241, 234, 0.22);
}

.page-about .about-swatches__chip--sand { background: var(--sand); }
.page-about .about-swatches__chip--blue { background: var(--tianshan); }
.page-about .about-swatches__chip--orange { background: var(--orange); }
.page-about .about-swatches__chip--pitch { background: var(--pitch); }

/* ---------- 长期在场 ---------- */
.page-about .about-standing {
  margin-block: clamp(2rem, 5vw, 3.5rem) clamp(2.5rem, 6vw, 4.5rem);
  padding: var(--about-pad);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--ink);
  box-shadow: var(--shadow-sheet);
}

.page-about .about-standing__grid {
  display: grid;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.page-about .about-standing__card {
  padding: 0.9rem 1rem;
  border: 1px solid rgba(16, 24, 32, 0.14);
  border-left: 3px solid var(--bronze);
  border-radius: var(--radius);
  background: rgba(244, 241, 234, 0.55);
}

.page-about .about-standing__card:nth-child(2) { border-left-color: var(--tianshan); }
.page-about .about-standing__card:nth-child(3) { border-left-color: var(--pitch); }

.page-about .about-standing__card h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.04rem;
  margin: 0 0 0.35rem;
  color: var(--ink);
}

.page-about .about-standing__card p {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.72;
  color: rgba(16, 24, 32, 0.8);
}

.page-about .about-standing__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1.4rem;
}

.page-about .about-standing .btn--ghost {
  color: var(--ink);
  border-color: rgba(16, 24, 32, 0.34);
  background: transparent;
}

.page-about .about-standing .btn--ghost:hover,
.page-about .about-standing .btn--ghost:focus-visible {
  border-color: var(--ink);
  background: rgba(16, 24, 32, 0.06);
}

/* ---------- 窄屏到宽屏 ---------- */
@media (max-width: 420px) {
  .page-about .about-board__row {
    grid-template-columns: 4.6rem minmax(0, 1fr);
  }
  .page-about .about-archive__stats {
    grid-template-columns: minmax(0, 1fr);
  }
}

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

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

@media (min-width: 820px) {
  .page-about .about-versions__grid {
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: stretch;
  }
  .page-about .about-version__split {
    flex-direction: column;
    padding: 0 0.9rem;
    font-size: 2.5rem;
  }
  .page-about .about-version__split::before,
  .page-about .about-version__split::after {
    width: 1px;
    height: auto;
    flex: 1;
  }
}

@media (min-width: 860px) {
  .page-about .about-timeline__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(1.5rem, 3vw, 2.6rem);
  }
  .page-about .about-years {
    align-self: start;
    position: sticky;
    top: 1.5rem;
  }
  .page-about .about-years ul {
    flex-direction: column;
    gap: 0.15rem;
  }
  .page-about .about-track {
    padding-left: 1.35rem;
  }
  .page-about .about-track::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.4rem;
    bottom: 0.4rem;
    width: 2px;
    border-radius: 2px;
    background: linear-gradient(180deg, var(--sand), rgba(138, 90, 43, 0.22));
  }
  .page-about .about-standing__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: center;
    gap: clamp(1.5rem, 4vw, 3rem);
  }
  .page-about .about-method__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    align-items: center;
    gap: clamp(1.5rem, 4vw, 3rem);
  }
  .page-about .about-archive__inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: center;
    gap: clamp(1.5rem, 4vw, 3rem);
  }
}

@media (min-width: 1024px) {
  .page-about .about-stop:nth-child(even) {
    margin-left: clamp(1rem, 4vw, 3.25rem);
  }
  .page-about .about-stop:nth-child(odd) {
    margin-right: clamp(1rem, 4vw, 3.25rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-board__bar {
    animation: none;
  }
  .page-about .about-stop,
  .page-about .about-years a {
    transition: none;
  }
}
<<<END>>>