.page-about {
  background: var(--c-paper);
  color: var(--c-night);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding: 14px var(--gutter) 0;
  max-width: var(--shell);
  margin: 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-slate);
}
.page-about .breadcrumb a {
  color: var(--c-lake);
  text-decoration: none;
}
.page-about .breadcrumb a:hover {
  color: var(--c-cyan);
  text-decoration: underline;
}
.page-about .breadcrumb span[aria-hidden] {
  margin: 0 6px;
  color: var(--c-line);
}

/* ---------- 首屏刊头 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 26px var(--gutter) 34px;
  background-color: var(--c-paper);
  background-image: repeating-linear-gradient(
    112deg,
    transparent 0 47px,
    rgba(201, 212, 220, 0.42) 47px 48px
  );
  border-bottom: 1px solid var(--c-line);
}
.page-about .about-hero__inner {
  max-width: var(--shell);
  margin: 0 auto;
}
.page-about .about-hero__kicker {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--c-lake);
  border-bottom: 2px solid var(--c-flag);
  padding-bottom: 4px;
  margin: 0 0 18px;
}
.page-about .about-hero__title {
  margin: 0 0 18px;
  font-size: clamp(28px, 6.4vw, 54px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  font-weight: 800;
  max-width: 18ch;
  border-left: 6px solid var(--c-flag);
  padding-left: 16px;
}
.page-about .about-hero__lead {
  margin: 0 0 30px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-slate);
}
.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--c-line);
  border: 1px solid var(--c-line);
}
.page-about .about-hero__stat {
  background: var(--c-paper);
  padding: 14px 14px 16px;
}
.page-about .about-hero__stat dt {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-slate);
  margin-bottom: 6px;
}
.page-about .about-hero__stat dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--c-night);
}

/* ---------- 布局骨架 ---------- */
.page-about .about-layout {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter) 56px;
}
.page-about .about-flow {
  min-width: 0;
}

/* ---------- 章节轨道 ---------- */
.page-about .about-rail {
  position: sticky;
  top: 0;
  z-index: 6;
  margin: 0 calc(var(--gutter) * -1) 8px;
  padding: 10px var(--gutter);
  background: var(--c-paper);
  border-bottom: 1px solid var(--c-line);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.page-about .about-rail__label {
  display: none;
}
.page-about .about-rail__list {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  white-space: nowrap;
  padding: 6px 10px;
  border: 1px solid var(--c-line);
  color: var(--c-slate);
  font-size: 13px;
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}
.page-about .about-rail__link .mono {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-lake);
  font-variant-numeric: tabular-nums;
}
.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-color: var(--c-lake);
  color: var(--c-night);
  background: rgba(14, 110, 122, 0.06);
  outline: none;
}

/* ---------- 章节 ---------- */
.page-about .chapter {
  padding: 40px 0 4px;
  scroll-margin-top: 76px;
}
.page-about .chapter::after {
  content: "";
  display: block;
  clear: both;
}
.page-about .chapter__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  border-bottom: 1px solid var(--c-line);
  padding-bottom: 12px;
  margin-bottom: 22px;
}
.page-about .chapter__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  font-variant-numeric: tabular-nums;
  color: var(--c-lake);
  background: rgba(14, 110, 122, 0.09);
  padding: 3px 8px;
}
.page-about .chapter__title {
  margin: 0;
  font-size: clamp(21px, 4.6vw, 30px);
  line-height: 1.28;
  letter-spacing: -0.02em;
  font-weight: 800;
}
.page-about .chapter p {
  max-width: 68ch;
  margin: 0 0 1.35em;
  font-size: 16px;
  line-height: 1.85;
}
.page-about .chapter p strong {
  color: var(--c-lake);
  font-weight: 700;
}
.page-about .chapter a {
  color: var(--c-lake);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.page-about .chapter a:hover {
  color: var(--c-cyan);
}

/* ---------- 配图 ---------- */
.page-about .about-figure {
  margin: 4px 0 24px;
}
.page-about .about-figure .media {
  overflow: hidden;
}
.page-about .about-figure .media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-figure figcaption {
  margin-top: 8px;
  font-family: var(--font-hand);
  font-size: 14px;
  line-height: 1.6;
  color: var(--c-slate);
  transform: rotate(-0.6deg);
}
.page-about .about-figure--full {
  margin-top: 30px;
}

/* ---------- 数据色带 ---------- */
.page-about .about-band {
  position: relative;
  margin: 32px 0 0;
  padding: 22px 20px 20px;
  background: var(--c-lake);
  color: var(--c-paper);
  overflow: hidden;
}
.page-about .about-band::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--c-flag);
}
.page-about .about-band::after {
  content: "";
  position: absolute;
  right: -40px;
  bottom: -46px;
  width: 180px;
  height: 2px;
  background: var(--c-flag);
  opacity: 0.55;
  transform: rotate(-38deg);
}
.page-about .about-band__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
  margin: 0;
}
.page-about .about-band__item dt {
  font-size: 12px;
  letter-spacing: 0.06em;
  opacity: 0.82;
  margin-bottom: 6px;
}
.page-about .about-band__item dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(20px, 3.6vw, 28px);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

/* ---------- 团队分工 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  margin: 8px 0 28px;
  padding: 22px 20px;
  border: 1px solid var(--c-line);
  background: rgba(18, 42, 77, 0.03);
}
.page-about .about-team__chart {
  justify-self: center;
  width: 168px;
  text-align: center;
}
.page-about .about-team__chart svg {
  display: block;
  width: 100%;
  height: auto;
}
.page-about .about-team__total {
  margin: 10px 0 0;
  font-size: 13px;
  color: var(--c-slate);
}
.page-about .about-team__total .mono {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--c-night);
  font-variant-numeric: tabular-nums;
}
.page-about .about-team__legend {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-team__legend li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 8px;
  border-bottom: 1px dashed var(--c-line);
  transition: background-color var(--dur) var(--ease);
}
.page-about .about-team__legend li:first-child {
  border-top: 1px dashed var(--c-line);
}
.page-about .about-team__legend li:hover {
  background: rgba(14, 110, 122, 0.07);
}
.page-about .about-team__swatch {
  flex: none;
  width: 12px;
  height: 12px;
}
.page-about .about-team__swatch--lake {
  background: var(--c-lake);
}
.page-about .about-team__swatch--teal {
  background: var(--c-teal);
}
.page-about .about-team__swatch--cyan {
  background: var(--c-cyan);
}
.page-about .about-team__name {
  flex: 1 1 auto;
  font-size: 15px;
}
.page-about .about-team__count {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--c-night);
  font-variant-numeric: tabular-nums;
}

/* ---------- 折叠面板的间距 ---------- */
.page-about .fold {
  margin: 0 0 10px;
}
.page-about .fold__panel p {
  max-width: 68ch;
  margin: 0 0 1.1em;
  font-size: 15px;
  line-height: 1.85;
}
.page-about .fold__panel p:last-child {
  margin-bottom: 0;
}
.page-about .fold__panel strong {
  color: var(--c-lake);
}

/* ---------- 里程碑时间线 ---------- */
.page-about .about-ms {
  position: relative;
  list-style: none;
  margin: 6px 0 0;
  padding: 0 0 0 28px;
}
.page-about .about-ms::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--c-line);
}
.page-about .about-ms__item {
  position: relative;
  padding: 0 0 26px;
}
.page-about .about-ms__item:last-child {
  padding-bottom: 6px;
}
.page-about .about-ms__dot {
  position: absolute;
  left: -28px;
  top: 5px;
  width: 12px;
  height: 12px;
  background: var(--c-panel);
  border: 1px solid var(--c-line);
}
.page-about .about-ms__item--flag .about-ms__dot {
  background: var(--c-flag);
  border-color: var(--c-flag);
  box-shadow: 0 0 0 4px rgba(232, 255, 58, 0.24);
}
.page-about .about-ms__year {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--c-lake);
  font-variant-numeric: tabular-nums;
}
.page-about .about-ms__title {
  margin: 0 0 6px;
  font-size: 17px;
  line-height: 1.5;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.page-about .about-ms__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-slate);
}
.page-about .about-ms__item {
  transition: transform var(--dur) var(--ease);
}

/* ---------- 行动区 ---------- */
.page-about .about-cta {
  background: var(--c-night);
  color: var(--c-paper);
  border-top: 3px solid var(--c-flag);
  padding: 44px var(--gutter) 52px;
}
.page-about .about-cta__inner {
  max-width: var(--shell);
  margin: 0 auto;
}
.page-about .about-cta__kicker {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-flag);
}
.page-about .about-cta__title {
  margin: 0 0 14px;
  font-size: clamp(24px, 4.8vw, 34px);
  line-height: 1.24;
  letter-spacing: -0.02em;
  font-weight: 800;
}
.page-about .about-cta__text {
  margin: 0 0 26px;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(245, 248, 249, 0.78);
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 平板起 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding-top: 34px;
    padding-bottom: 44px;
  }
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-rail {
    overflow: visible;
  }
  .page-about .about-rail__list {
    flex-wrap: wrap;
  }
  .page-about .about-band__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-team {
    grid-template-columns: 190px minmax(0, 1fr);
    align-items: center;
    gap: 32px;
    padding: 26px 26px;
  }
  .page-about .about-figure--left,
  .page-about .about-figure--right {
    float: none;
    width: 100%;
    margin: 4px 0 24px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 980px) {
  .page-about .breadcrumb {
    padding-top: 20px;
  }
  .page-about .about-hero {
    padding-top: 40px;
    padding-bottom: 56px;
  }
  .page-about .about-hero__lead {
    font-size: 17px;
  }
  .page-about .about-layout {
    display: grid;
    grid-template-columns: 152px minmax(0, 1fr);
    gap: 48px;
    padding-top: 48px;
    padding-bottom: 80px;
  }
  .page-about .about-rail {
    position: sticky;
    top: 28px;
    align-self: start;
    margin: 0;
    padding: 0;
    background: transparent;
    border-bottom: 0;
    overflow: visible;
  }
  .page-about .about-rail__label {
    display: block;
    margin: 0 0 12px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.2em;
    color: var(--c-slate);
  }
  .page-about .about-rail__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
    border-left: 1px solid var(--c-line);
  }
  .page-about .about-rail__link {
    width: 100%;
    border: 0;
    border-left: 3px solid transparent;
    margin-left: -2px;
    padding: 9px 0 9px 13px;
    font-size: 14px;
    transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease),
      background-color var(--dur) var(--ease);
  }
  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-left-color: var(--c-flag);
    background: rgba(232, 255, 58, 0.12);
  }
  .page-about .chapter {
    padding-top: 56px;
  }
  .page-about .chapter:first-child {
    padding-top: 6px;
  }
  .page-about .chapter__title {
    font-size: 30px;
  }
  .page-about .about-figure--right {
    float: right;
    width: 44%;
    margin: 4px 0 18px 34px;
  }
  .page-about .about-figure--left {
    float: left;
    width: 38%;
    margin: 6px 34px 18px 0;
  }
  .page-about .about-band {
    padding: 26px 28px 24px;
  }
  .page-about .about-band__list {
    grid-template-columns: repeat(auto-fit, minmax(0, 1fr));
    gap: 20px 28px;
  }
  .page-about .about-ms__item:hover {
    transform: translateX(4px);
  }
  .page-about .about-cta {
    padding-top: 56px;
    padding-bottom: 64px;
  }
}
<<<END>>>