.page-about {
  --about-rail: 180px;
  --about-pad: clamp(20px, 3.2vw, 40px);
  --about-radius: 2px;
  background: var(--mist);
  color: var(--ink);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(18px, 3vw, 32px) clamp(30px, 5vw, 64px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% -10% auto auto;
  width: 62vw;
  height: 62vw;
  background: radial-gradient(circle at 50% 50%, rgba(127, 182, 255, .3), rgba(28, 105, 212, .08) 45%, transparent 70%);
  pointer-events: none;
}

.page-about .about-hero__crumb {
  position: relative;
  margin-bottom: clamp(14px, 2vw, 22px);
}

.page-about .about-hero__crumb a,
.page-about .about-hero__crumb li {
  color: var(--on-dark-soft);
}

.page-about .about-hero__crumb a:hover {
  color: var(--orange);
}

.page-about .about-hero__frame {
  position: relative;
  padding: clamp(22px, 4vw, 54px) clamp(18px, 4vw, 54px);
  border: 1px solid var(--line-strong);
  background:
    linear-gradient(145deg, rgba(28, 105, 212, .26), rgba(11, 15, 20, .05) 52%),
    rgba(21, 27, 35, .55);
  backdrop-filter: blur(8px);
}

.page-about .about-hero__corner {
  position: absolute;
  width: 26px;
  height: 26px;
  border: 2px solid var(--blue);
}

.page-about .about-hero__corner--tl {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .about-hero__corner--br {
  right: -1px;
  bottom: -1px;
  border-left: 0;
  border-top: 0;
  border-color: var(--orange);
}

.page-about .about-hero__title {
  margin: 10px 0 0;
  max-width: 20ch;
  color: var(--on-dark);
  font-size: clamp(30px, 5.6vw, 62px);
  line-height: 1.08;
  letter-spacing: -.01em;
}

.page-about .about-hero__lede {
  max-width: 62ch;
  margin: clamp(14px, 2vw, 22px) 0 0;
  color: var(--on-dark-soft);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.75;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
}

.page-about .about-hero__stats li {
  padding: 14px 12px;
  background: rgba(11, 15, 20, .72);
}

.page-about .about-hero__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 34px);
  font-weight: 700;
  color: var(--neon);
  letter-spacing: -.02em;
}

.page-about .about-hero__key {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--on-dark-soft);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-hero__anno {
  position: absolute;
  top: clamp(22px, 4vw, 54px);
  right: 6px;
  color: var(--silver);
  opacity: .7;
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  background: linear-gradient(180deg, var(--mist) 0%, #E8F1FE 42%, var(--mist) 100%);
  padding-block: clamp(32px, 5vw, 68px);
}

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

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  border-left: 2px solid var(--blue);
  padding-left: 14px;
}

.page-about .about-index__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--blue);
}

.page-about .about-index__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 4px 0;
  font-size: 13px;
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--blue);
  border-bottom-color: var(--orange);
}

.page-about .about-index__no {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--silver);
}

.page-about .about-index__note {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--silver);
}

/* ---------- 章节面板堆叠 ---------- */
.page-about .about-flow {
  display: grid;
  gap: clamp(18px, 2.6vw, 32px);
  min-width: 0;
}

.page-about .about-chapter {
  position: relative;
  min-width: 0;
  padding: var(--about-pad);
  border-radius: var(--about-radius);
  overflow: hidden;
}

.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: clamp(12px, 2vw, 20px);
}

.page-about .about-chapter__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--orange);
}

.page-about .about-chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-style: italic;
  font-size: clamp(21px, 3vw, 32px);
  line-height: 1.2;
  letter-spacing: -.01em;
}

.page-about .about-chapter__lede {
  margin: 0 0 clamp(14px, 2vw, 22px);
  font-size: clamp(15px, 1.6vw, 16.5px);
  line-height: 1.75;
  max-width: 66ch;
}

.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.4vw, 28px);
}

.page-about .about-chapter__text p {
  margin: 0 0 1em;
}

.page-about .about-chapter__text p:last-child {
  margin-bottom: 0;
}

.page-about .about-chapter__media {
  margin: 0;
}

.page-about .about-chapter.panel--dark .about-chapter__title,
.page-about .about-chapter.panel--dark .about-chapter__lede,
.page-about .about-chapter.panel--dark .about-chapter__text {
  color: var(--on-dark);
}

.page-about .about-chapter.panel--dark .about-chapter__lede {
  color: var(--on-dark-soft);
}

/* ---------- 团队规模 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  padding: 0;
  list-style: none;
  background: var(--line-ink);
  border: 1px solid var(--line-ink);
}

.page-about .about-team__cell {
  padding: 16px 14px;
  background: var(--mist);
}

.page-about .about-team__cell p {
  margin: 8px 0 0;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--ink-soft);
}

.page-about .about-team__cell .data-figure {
  color: var(--blue);
}

.page-about .about-team__cell .data-figure__unit {
  margin-left: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-soft);
}

/* ---------- 价值理念 ---------- */
.page-about .about-values__list {
  display: grid;
  gap: 10px;
  margin-top: clamp(14px, 2vw, 22px);
}

.page-about .about-values__item {
  border: 1px solid var(--line);
  background: rgba(245, 247, 250, .05);
  transition: border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .about-values__item[open] {
  border-color: rgba(255, 107, 26, .55);
  background: rgba(28, 105, 212, .12);
}

.page-about .about-values__summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  color: var(--on-dark);
}

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

.page-about .about-values__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--orange);
}

.page-about .about-values__item[open] .about-values__summary::after {
  content: "−";
}

.page-about .about-values__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--blue-soft);
}

.page-about .about-values__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-style: italic;
  font-size: clamp(17px, 2.2vw, 21px);
}

.page-about .about-values__hint {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--silver);
}

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

.page-about .about-values__panel p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--on-dark-soft);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline__bar {
  margin-bottom: clamp(16px, 2.4vw, 26px);
}

.page-about .about-timeline__bar .filter-btn {
  font-size: 12px;
}

.page-about .about-timeline__bar .filter-bar__count {
  font-family: var(--font-mono);
  color: var(--neon);
}

.page-about .about-timeline__list {
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--blue), rgba(88, 245, 166, .55) 60%, rgba(255, 107, 26, .6));
}

.page-about .about-timeline__node {
  position: relative;
  padding: 12px 0 16px;
  border-bottom: 1px dashed var(--line-soft);
}

.page-about .about-timeline__node:last-child {
  border-bottom: 0;
}

.page-about .about-timeline__node::before {
  content: "";
  position: absolute;
  top: 18px;
  left: -25px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--carbon);
  border: 2px solid var(--neon);
  box-shadow: 0 0 0 3px rgba(88, 245, 166, .14);
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(19px, 2.6vw, 26px);
  font-weight: 700;
  color: var(--blue-soft);
  letter-spacing: -.01em;
}

.page-about .about-timeline__body h3 {
  margin: 4px 0 6px;
  font-size: clamp(15px, 1.8vw, 17px);
  color: var(--on-dark);
  font-weight: 700;
}

.page-about .about-timeline__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--on-dark-soft);
  max-width: 64ch;
}

.page-about .about-timeline__figure {
  margin: 18px 0;
}

.page-about .about-timeline__figure .media-frame {
  max-width: 360px;
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: clamp(14px, 2vw, 22px) 0 clamp(18px, 2.6vw, 26px);
  background: var(--line-ink);
  border: 1px solid var(--line-ink);
}

.page-about .about-eco__legend {
  padding: 18px 16px;
  background: var(--mist);
}

.page-about .about-eco__swatch {
  display: block;
  width: 26px;
  height: 4px;
  margin-bottom: 10px;
}

.page-about .about-eco__swatch--blue { background: var(--blue); }
.page-about .about-eco__swatch--orange { background: var(--orange); }
.page-about .about-eco__swatch--neon { background: var(--neon); }

.page-about .about-eco__legend h3 {
  margin: 0 0 6px;
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--ink-soft);
  font-weight: 600;
}

.page-about .about-eco__legend .data-figure {
  color: var(--ink);
}

.page-about .about-eco__legend .data-figure__unit {
  margin-left: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-soft);
}

.page-about .about-eco__legend p:last-child {
  margin: 8px 0 0;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--ink-soft);
}

.page-about .about-eco__media {
  margin: 0 0 clamp(16px, 2.4vw, 24px);
}

.page-about .about-eco__award {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 10px 14px;
  padding: 16px 18px;
  border-left: 3px solid var(--orange);
  background: rgba(255, 107, 26, .07);
}

.page-about .about-eco__award p {
  margin: 0;
  flex: 1 1 260px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* ---------- 多端承诺 ---------- */
.page-about .about-promise__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 2.6vw, 30px);
}

.page-about .about-promise__text p {
  margin: 0 0 1em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-promise__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

.page-about .about-promise__versions {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: rgba(11, 15, 20, .12);
  border: 1px solid rgba(11, 15, 20, .12);
  align-self: start;
}

.page-about .about-promise__versions li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 14px;
  background: rgba(245, 247, 250, .82);
}

.page-about .about-promise__k {
  font-size: 13px;
  color: var(--ink-soft);
}

.page-about .about-promise__v {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--blue);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  padding-block: clamp(30px, 5vw, 60px);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.4vw, 28px);
  align-items: center;
}

.page-about .about-cta__title {
  margin: 8px 0 0;
  color: var(--on-dark);
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.15;
}

.page-about .about-cta__lede {
  margin: 10px 0 0;
  max-width: 58ch;
  color: var(--on-dark-soft);
  font-size: 15px;
  line-height: 1.75;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 显现 ---------- */
.page-about [data-reveal].is-in {
  animation: about-rise .52s var(--ease) both;
}

@keyframes about-rise {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: none; }
}

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

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal].is-in {
    animation: none;
  }
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-eco__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-chapter__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
  }

  .page-about .about-team {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
  }
}

@media (min-width: 980px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(24px, 3.4vw, 48px);
  }

  .page-about .about-index {
    position: sticky;
    top: 28px;
    align-self: start;
  }

  .page-about .about-index__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }

  .page-about .about-index__list a {
    width: 100%;
  }

  .page-about .about-promise__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
    align-items: start;
  }

  .page-about .about-timeline__list {
    padding-left: 40px;
  }

  .page-about .about-timeline__node {
    padding-left: 24px;
  }

  .page-about .about-timeline__node::before {
    left: -39px;
    top: 22px;
  }

  .page-about .about-timeline__figure {
    padding-left: 24px;
  }
}
<<<END>>>