.page-about {
  --about-rail: 168px;
  background: var(--c-ink);
  color: var(--c-silver);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px;
  font-size: 12px;
  letter-spacing: .08em;
  margin-bottom: 34px;
}

.page-about .breadcrumbs a {
  color: var(--c-mist);
  text-decoration: none;
  transition: color .16s var(--ease);
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--c-signal);
}

.page-about .breadcrumbs [aria-current="page"] {
  color: var(--c-silver);
}

.page-about .about-crumb-sep {
  margin: 0 6px;
  color: rgba(143, 163, 161, .6);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 54px) 0 58px;
  background:
    radial-gradient(118% 88% at 84% 6%, rgba(255, 106, 26, .17), transparent 58%),
    linear-gradient(180deg, var(--c-ink) 0%, var(--c-ink) 72%, var(--c-night) 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(90deg, rgba(201, 212, 210, .05) 0 1px, transparent 1px 98px);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .85), transparent 76%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .85), transparent 76%);
}

.page-about .about-hero > .container {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 22px;
}

.page-about .about-hero__aside {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .about-vert {
  margin: 0;
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--c-mist);
}

.page-about .about-hero__main .h-display {
  margin: 0 0 22px;
  font-size: clamp(33px, 7.2vw, 84px);
  line-height: 1.08;
  letter-spacing: -.01em;
  color: var(--c-white);
}

.page-about .about-hero__main .lede {
  margin: 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-silver);
}

/* ---------- 数据条 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 42px 0 0;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-stat {
  background: var(--c-ink);
  padding: 18px 14px 20px;
}

.page-about .about-stat:first-child {
  background: linear-gradient(180deg, var(--tint-signal), var(--c-ink));
}

.page-about .about-stat dt {
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--c-mist);
  margin-bottom: 8px;
}

.page-about .about-stat dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 28px;
  line-height: 1;
  color: var(--c-white);
}

.page-about .about-stat dd span {
  margin-left: 6px;
  font-size: 12px;
  font-family: var(--font-sans);
  color: var(--c-mist);
  letter-spacing: .06em;
}

/* ---------- 斜向色带 ---------- */
.page-about .about-band {
  display: block;
  height: 7px;
  transform-origin: left center;
  background: linear-gradient(90deg, var(--c-signal) 0%, var(--c-gold) 64%, rgba(242, 179, 61, 0) 100%);
  clip-path: polygon(0 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
  animation: aboutBandIn .55s var(--ease) both;
}

.page-about .about-band--a { width: 92%; }
.page-about .about-band--b { width: 72%; }
.page-about .about-band--c { width: 54%; }
.page-about .about-band--d { width: 36%; }

@keyframes aboutBandIn {
  from { transform: scaleX(0); opacity: .35; }
  to { transform: scaleX(1); opacity: 1; }
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding: 58px 0;
}

.page-about .about-chapter__grid {
  display: grid;
  gap: 24px;
}

.page-about .about-chapter__rail {
  display: flex;
  align-items: center;
  gap: 14px;
}

.page-about .about-chapter__rail .chapter-num {
  font-size: clamp(46px, 12vw, 88px);
  line-height: .84;
  color: transparent;
  -webkit-text-stroke: 1.4px rgba(201, 212, 210, .38);
}

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

.page-about .about-chapter__body .h2 {
  margin: 0 0 18px;
  font-size: clamp(25px, 4.4vw, 44px);
  line-height: 1.16;
  color: var(--c-white);
}

.page-about .about-lead {
  margin: 0 0 30px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-silver);
}

.page-about .about-note {
  margin: 22px 0 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--c-mist);
}

/* ---------- 能力清单 ---------- */
.page-about .cap-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .cap-item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 4px 14px;
  padding: 22px 14px;
  border-bottom: 1px solid var(--line);
  transition: background-color .16s var(--ease);
}

.page-about .cap-item:hover,
.page-about .cap-item:focus-within {
  background: var(--tint-signal);
}

.page-about .cap-item__idx {
  grid-row: 1 / span 2;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-signal);
  padding-top: 5px;
}

.page-about .cap-item__title {
  margin: 0;
  font-size: 18px;
  line-height: 1.35;
  color: var(--c-white);
}

.page-about .cap-item__desc {
  grid-column: 2;
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--c-silver);
}

/* ---------- 横幅图 ---------- */
.page-about .about-banner {
  margin: 0 0 42px;
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 34px), calc(100% - 76px) 100%, 0 100%);
}

.page-about .about-banner figcaption {
  margin-top: 12px;
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--c-mist);
}

/* ---------- 时间线 ---------- */
.page-about .tl {
  list-style: none;
  margin: 6px 0 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--c-signal), rgba(255, 106, 26, .08));
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 30px;
}

.page-about .tl-item:last-child {
  padding-bottom: 4px;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 5px;
  width: 12px;
  height: 12px;
  box-sizing: border-box;
  background: var(--c-night);
  border: 2px solid var(--c-signal);
  transform: rotate(45deg);
  transition: background-color .18s var(--ease), transform .18s var(--ease);
}

.page-about .tl-item:hover::before,
.page-about .tl-item:focus-within::before {
  background: var(--c-signal);
  transform: rotate(45deg) scale(1.18);
}

.page-about .tl-year {
  display: block;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--c-signal);
}

.page-about .tl-title {
  margin: 7px 0 7px;
  font-size: 18px;
  line-height: 1.4;
  color: var(--c-white);
}

.page-about .tl-note {
  margin: 0;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--c-mist);
  transition: color .16s var(--ease);
}

.page-about .tl-item:hover .tl-note {
  color: var(--c-silver);
}

/* ---------- 图文错位 ---------- */
.page-about .about-split {
  display: grid;
  gap: 26px;
}

.page-about .about-figure {
  position: relative;
  margin: 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), calc(100% - 30px) 100%, 0 100%);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--c-mist);
}

.page-about .src-list {
  list-style: none;
  margin: 0 0 8px;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .src-list li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.page-about .src-list .mono {
  flex: 0 0 auto;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  font-size: 12px;
  color: var(--c-signal);
  background: var(--tint-signal);
  border: 1px solid rgba(255, 106, 26, .42);
  clip-path: polygon(0 0, 100% 0, 100% 68%, 68% 100%, 0 100%);
}

.page-about .src-list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--c-silver);
}

.page-about .src-list strong {
  color: var(--c-white);
  font-weight: 600;
}

.page-about .metrics-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 34px;
}

.page-about .metrics-row > :last-child {
  grid-column: 1 / -1;
}

.page-about .metrics-row .metric__value {
  font-size: 26px;
}

.page-about .metrics-row .metric__value span {
  margin-left: 4px;
  font-size: 12px;
  font-family: var(--font-sans);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: var(--c-white);
  color: var(--c-moss);
}

.page-about .about-team .chapter-num {
  -webkit-text-stroke: 1.4px rgba(10, 35, 37, .4);
}

.page-about .about-team .about-vert {
  color: rgba(10, 35, 37, .58);
}

.page-about .about-team .h2 {
  color: var(--c-moss);
}

.page-about .about-team .about-lead {
  color: rgba(10, 35, 37, .74);
}

.page-about .team-grid {
  display: grid;
  gap: 12px;
}

.page-about .team-card {
  background: #fff;
  border: 1px solid rgba(10, 35, 37, .16);
  border-top: 3px solid var(--c-signal);
  padding: 20px 18px 22px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-about .team-card__num {
  display: block;
  font-size: 10.5px;
  letter-spacing: .18em;
  color: var(--c-signal);
  margin-bottom: 10px;
}

.page-about .team-card__name {
  margin: 0 0 8px;
  font-size: 17px;
  color: var(--c-moss);
}

.page-about .team-card__duty {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(10, 35, 37, .7);
}

/* ---------- 本地城市 ---------- */
.page-about .city-list {
  list-style: none;
  margin: 0 0 4px;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .city-list li {
  border-left: 2px solid rgba(255, 106, 26, .5);
  padding-left: 14px;
}

.page-about .city-list__name {
  display: block;
  font-size: 16px;
  color: var(--c-white);
  margin-bottom: 6px;
  letter-spacing: .04em;
}

.page-about .city-list p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--c-silver);
}

/* ---------- 专题 ---------- */
.page-about .topic-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .topic-item {
  background: var(--c-ink);
  padding: 22px 18px 24px;
  transition: background-color .16s var(--ease);
}

.page-about .topic-item:hover {
  background: var(--c-night);
}

.page-about .topic-item__title {
  margin: 0 0 8px;
  font-size: 17px;
  color: var(--c-gold);
}

.page-about .topic-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--c-silver);
}

/* ---------- 下一步 ---------- */
.page-about .next-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .next-card {
  display: block;
  padding: 24px 20px 26px;
  background: var(--c-ink);
  text-decoration: none;
  transition: background-color .16s var(--ease), border-color .16s var(--ease);
  border-left: 3px solid transparent;
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  background: var(--c-night);
  border-left-color: var(--c-signal);
}

.page-about .next-card__num {
  display: block;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--c-mist);
  margin-bottom: 10px;
}

.page-about .next-card__title {
  margin: 0 0 8px;
  font-size: 18px;
  color: var(--c-white);
}

.page-about .next-card__text {
  margin: 0 0 16px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--c-silver);
}

.page-about .next-card__go {
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--c-signal);
}

.page-about .about-cta {
  display: flex;
  flex-direction: column;
  gap: 18px;
  align-items: flex-start;
  margin-top: 34px;
  padding: 26px 22px;
  border: 1px solid rgba(255, 106, 26, .38);
  background: linear-gradient(120deg, rgba(255, 106, 26, .14), rgba(6, 42, 46, 0) 72%);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 20px 100%, 0 calc(100% - 20px));
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 50ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-white);
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 700px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .metrics-row > :last-child {
    grid-column: auto;
  }

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

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

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

  .page-about .about-cta {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 28px 30px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: calc(var(--header-h) + 88px) 0 78px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    gap: 56px;
    align-items: center;
  }

  .page-about .about-hero__aside {
    min-height: 320px;
    justify-content: space-between;
    align-items: flex-start;
  }

  .page-about .about-vert {
    writing-mode: vertical-rl;
    letter-spacing: .34em;
  }

  .page-about .about-chapter {
    padding: 84px 0;
  }

  .page-about .about-chapter__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 54px;
    align-items: start;
  }

  .page-about .about-chapter__grid--reflow {
    grid-template-columns: minmax(0, 1fr) var(--about-rail);
  }

  .page-about .about-chapter__grid--reflow .about-chapter__body {
    order: 1;
  }

  .page-about .about-chapter__grid--reflow .about-chapter__rail {
    order: 2;
    flex-direction: column;
    align-items: flex-start;
    gap: 22px;
  }

  .page-about .about-chapter__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 22px;
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .about-chapter__rail .about-vert {
    writing-mode: vertical-rl;
    letter-spacing: .3em;
  }

  .page-about .cap-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 34px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 46px;
    align-items: start;
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-about .about-split--reverse .about-figure {
    order: 2;
  }

  .page-about .about-split--reverse .about-split__text {
    order: 1;
  }

  .page-about .about-figure figcaption {
    position: absolute;
    right: -18px;
    top: 26px;
    margin: 0;
    writing-mode: vertical-rl;
    letter-spacing: .24em;
  }

  .page-about .about-figure--wide figcaption {
    right: -18px;
  }

  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 1180px) {
  .page-about {
    --about-rail: 210px;
  }

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

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

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