.page-about {
  --about-soft: rgba(18, 49, 42, .62);
  --about-hair: rgba(30, 64, 56, .95);
  --about-glow-mint: rgba(53, 245, 200, .15);
  --about-glow-amber: rgba(255, 162, 58, .1);
  position: relative;
  isolation: isolate;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* ---------- 通用小节标记 ---------- */

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  margin: 0 0 .85rem;
  font-family: var(--font-body);
  font-size: .75rem;
  font-weight: 500;
  letter-spacing: .16em;
  color: var(--mint);
}

.page-about .about-kicker::before {
  content: "";
  width: 24px;
  height: 1px;
  background: currentColor;
  opacity: .7;
  flex: none;
}

.page-about h2.display--sm {
  margin: 0 0 1rem;
  max-width: 30ch;
}

.page-about .about-index {
  display: block;
  font-family: var(--font-mono);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .06em;
  font-variant-numeric: tabular-nums;
  color: var(--amber);
  padding-top: .2rem;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding-top: clamp(.75rem, 2vw, 1.25rem);
  padding-bottom: clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -120px 0 auto 0;
  height: 560px;
  background:
    radial-gradient(48% 62% at 18% 0%, var(--about-glow-mint), transparent 68%),
    radial-gradient(42% 55% at 86% 8%, var(--about-glow-amber), transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: -120px 0 auto 0;
  height: 560px;
  background-image:
    linear-gradient(rgba(53, 245, 200, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(53, 245, 200, .05) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(72% 70% at 26% 0%, #000, transparent 74%);
  mask-image: radial-gradient(72% 70% at 26% 0%, #000, transparent 74%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 1.75rem;
}

.page-about .about-hero__main h1 {
  margin: .5rem 0 1rem;
  max-width: 22ch;
}

.page-about .about-hero__main .lead {
  max-width: 58ch;
  margin: 0;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-stats__item {
  background: var(--about-soft);
  padding: .95rem 1rem 1.05rem;
}

.page-about .about-stats dt {
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .08em;
  color: var(--ink-dim);
}

.page-about .about-stats dd {
  margin: .3rem 0 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.2rem, 2.6vw, 1.5rem);
  font-variant-numeric: tabular-nums;
  letter-spacing: -.01em;
  color: var(--mint);
}

@media (min-width: 62rem) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: 3.5rem;
  }
}

/* ---------- 起点 ---------- */

.page-about .about-why__grid {
  display: grid;
  gap: 1.75rem;
}

.page-about .about-why__main p {
  margin: 0 0 1rem;
  max-width: 60ch;
}

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

.page-about .about-pains {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-pains li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .85rem;
  align-items: start;
  padding: .9rem 1rem;
  background: var(--about-soft);
}

.page-about .about-pains li p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.72;
  color: var(--ink-dim);
}

@media (min-width: 62rem) {
  .page-about .about-why__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 3rem;
    align-items: start;
  }
}

/* ---------- 从采集到上屏 ---------- */

.page-about .about-steps {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-steps__item {
  position: relative;
  background: var(--about-soft);
  padding: 1.4rem 1.2rem 1.5rem;
}

.page-about .about-steps__item::before {
  content: "";
  position: absolute;
  left: 1.2rem;
  top: 0;
  width: 40px;
  height: 2px;
  background: linear-gradient(90deg, var(--mint), transparent);
}

.page-about .about-steps__no {
  display: block;
  margin-bottom: .55rem;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .85rem;
  letter-spacing: .1em;
  color: var(--amber);
}

.page-about .about-steps__title {
  margin: 0 0 .55rem;
  font-family: var(--font-display);
  font-size: 1.16rem;
  font-weight: 600;
  letter-spacing: .01em;
  color: var(--ink);
}

.page-about .about-steps__item p {
  margin: 0;
  font-size: .93rem;
  line-height: 1.76;
  color: var(--ink-dim);
}

.page-about .about-flow__note {
  margin: 1.4rem 0 0;
  padding: .95rem 1.1rem;
  border-left: 2px solid var(--amber);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: linear-gradient(90deg, rgba(255, 162, 58, .09), transparent 72%);
  font-size: .92rem;
  line-height: 1.78;
  color: var(--ink-dim);
}

.page-about .about-flow__note strong {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--amber);
}

@media (min-width: 56rem) {
  .page-about .about-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 团队分工 ---------- */

.page-about .about-beams {
  display: grid;
  gap: 1rem;
  margin: 1.75rem 0 1.75rem;
}

.page-about .about-beam {
  padding: 1.3rem 1.2rem 1.45rem;
  background: var(--about-soft);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  box-shadow: inset 0 1px 0 rgba(53, 245, 200, .06);
}

.page-about .about-beam--lead {
  background: linear-gradient(158deg, rgba(53, 245, 200, .1), var(--about-soft) 58%);
  border-color: rgba(53, 245, 200, .28);
}

.page-about .about-beam__name {
  margin: 0 0 .35rem;
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--ink);
}

.page-about .about-beam__meta {
  margin: 0 0 .7rem;
  font-size: .74rem;
  font-weight: 500;
  letter-spacing: .08em;
  color: var(--mint);
}

.page-about .about-beam p:last-child {
  margin: 0;
  font-size: .92rem;
  line-height: 1.76;
  color: var(--ink-dim);
}

.page-about .about-team__foot {
  display: grid;
  gap: 1.5rem;
  align-items: center;
}

.page-about .about-team__note-title {
  margin: 0 0 .5rem;
  font-family: var(--font-display);
  font-size: 1.06rem;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--ink);
}

.page-about .about-team__note p {
  margin: 0;
  font-size: .93rem;
  line-height: 1.78;
  color: var(--ink-dim);
}

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

.page-about .about-team__figure .media,
.page-about .about-path__figure .media,
.page-about .about-season__figure .media {
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .media__caption {
  margin-top: .7rem;
  font-size: .8rem;
  line-height: 1.7;
  color: var(--ink-dim);
}

@media (min-width: 56rem) {
  .page-about .about-beams {
    grid-template-columns: 1.35fr 1fr 1fr;
    align-items: stretch;
  }
}

@media (min-width: 62rem) {
  .page-about .about-team__foot {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 2.5rem;
  }
}

/* ---------- 发展路线 ---------- */

.page-about .about-path__figure {
  margin: 1.5rem 0 2rem;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 1.9rem;
  padding-bottom: 1.05rem;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__item::after {
  content: "";
  position: absolute;
  left: 0;
  top: .95rem;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 0 3px rgba(53, 245, 200, .13);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 1.25rem;
  bottom: .1rem;
  width: 1px;
  background: linear-gradient(180deg, rgba(53, 245, 200, .6), rgba(53, 245, 200, .1));
}

.page-about .about-timeline__item:last-child::before {
  display: none;
}

.page-about .about-node {
  background: var(--about-soft);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 160ms var(--ease);
}

.page-about .about-node[open] {
  border-color: rgba(53, 245, 200, .26);
}

.page-about .about-node__summary {
  display: flex;
  align-items: baseline;
  gap: .85rem;
  padding: .85rem 1rem;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-node__summary::marker {
  content: "";
}

.page-about .about-node__summary:hover {
  background: rgba(53, 245, 200, .05);
}

.page-about .about-node__summary:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: -2px;
}

.page-about .about-node__year {
  flex: none;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1rem;
  font-variant-numeric: tabular-nums;
  color: var(--amber);
}

.page-about .about-node__label {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.04rem;
  letter-spacing: .02em;
  color: var(--ink);
}

.page-about .about-node__chev {
  flex: none;
  margin-left: auto;
  width: 8px;
  height: 8px;
  border-right: 1.5px solid var(--ink-dim);
  border-bottom: 1.5px solid var(--ink-dim);
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform 180ms var(--ease);
}

.page-about .about-node[open] .about-node__chev {
  transform: rotate(-135deg) translate(-2px, -2px);
}

.page-about .about-node__body {
  padding: 0 1rem 1rem;
}

.page-about .about-node__body p {
  margin: 0;
  font-size: .93rem;
  line-height: 1.78;
  color: var(--ink-dim);
}

/* ---------- 赛季节奏 ---------- */

.page-about .about-season__body {
  max-width: 62ch;
}

.page-about .about-season__body > p {
  margin: 0 0 1rem;
}

.page-about .about-season__list {
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
  display: grid;
  gap: .7rem;
}

.page-about .about-season__list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .75rem;
  font-size: .93rem;
  line-height: 1.76;
  color: var(--ink-dim);
}

.page-about .about-season__list li::before {
  content: "";
  align-self: start;
  width: 6px;
  height: 6px;
  margin-top: .68rem;
  border-radius: 50%;
  border: 1px solid var(--mint);
}

.page-about .about-season__more {
  margin: 0;
  font-size: .93rem;
  line-height: 1.76;
  color: var(--ink-dim);
}

.page-about .about-season__more a {
  color: var(--mint-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 245, 200, .35);
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-season__more a:hover {
  color: var(--mint);
  border-color: var(--mint);
}

.page-about .about-season__figure {
  margin: 2rem 0 0;
}

/* ---------- 长期服务 ---------- */

.page-about .about-service__inner {
  border-top: 1px solid var(--about-hair);
  padding-top: 2.5rem;
}

.page-about .about-service__inner > p {
  margin: 0 0 1rem;
  max-width: 62ch;
}

.page-about .about-service__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.5rem;
}

.page-about .about-top {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  margin-top: 1.75rem;
  font-size: .85rem;
  letter-spacing: .05em;
  color: var(--ink-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-top::before {
  content: "↑";
  font-family: var(--font-mono);
  line-height: 1;
}

.page-about .about-top:hover {
  color: var(--mint);
  border-color: var(--mint);
}

.page-about .about-top:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 3px;
}

/* ---------- 动效降级 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node,
  .page-about .about-node__chev,
  .page-about .about-top,
  .page-about .about-season__more a {
    transition: none;
  }
}
<<<END>>>