.page-about {
  --about-grid-gap: clamp(28px, 5vw, 56px);
  --about-toc-w: 220px;
  color: var(--paper);
  padding-bottom: clamp(40px, 8vw, 96px);
  scroll-behavior: smooth;
}

.page-about a {
  color: var(--cyan);
}

.page-about a:hover,
.page-about a:focus-visible {
  color: var(--paper);
  outline: none;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(14px, 2vw, 28px) clamp(36px, 6vw, 64px);
  overflow: hidden;
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at 84% 18%, rgba(57, 243, 206, 0.14), transparent 44%),
    linear-gradient(160deg, var(--ink-2) 0%, var(--ink) 62%, var(--ink) 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -10%;
  top: 34%;
  width: 44%;
  height: 180px;
  background: linear-gradient(100deg, transparent, rgba(57, 243, 206, 0.07));
  transform: rotate(-12deg);
  z-index: -1;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(18px, 3vw, 32px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
  align-items: end;
}

.page-about .about-hero__text {
  display: flex;
  flex-direction: column;
  gap: clamp(14px, 2vw, 20px);
  max-width: 62ch;
}

.page-about .about-hero__text .kicker {
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 5.4vw, 3.5rem);
  line-height: 1.06;
  letter-spacing: -0.008em;
  margin: 0;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 0;
  font-family: var(--font-body);
  font-size: clamp(0.96rem, 1.35vw, 1.06rem);
  line-height: 1.78;
  color: var(--paper);
  opacity: 0.88;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  border-top: 1px solid var(--line);
  padding-top: 16px;
  margin-top: 2px;
}

.page-about .stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .stat__num {
  font-family: var(--font-num);
  font-size: clamp(1.4rem, 3vw, 2.1rem);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--amber);
}

.page-about .stat__plus {
  color: var(--cyan);
  font-size: 0.62em;
  vertical-align: super;
  margin-left: 2px;
}

.page-about .stat__label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  border: 2px solid var(--cyan);
  box-shadow: var(--shadow-hard);
  aspect-ratio: 4 / 3;
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% 86%, 7% 100%, 0 100%);
}

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

.page-about .about-hero__media::after {
  content: "2018 / TODAY";
  position: absolute;
  left: 0;
  bottom: 14px;
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: 0.22em;
  color: var(--paper);
  background: rgba(6, 23, 19, 0.85);
  padding: 4px 12px;
  border-left: 3px solid var(--cyan);
}

/* ---------- 正文骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: var(--about-grid-gap);
  margin-top: clamp(24px, 4vw, 56px);
}

.page-about .about-toc {
  align-self: start;
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  background: rgba(12, 43, 35, 0.6);
  padding: 16px 18px;
}

.page-about .about-toc__label {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-toc__list a {
  display: block;
  padding: 7px 0;
  font-size: 14px;
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px dashed rgba(157, 183, 173, 0.22);
  transition: color 160ms ease, padding-left 160ms ease;
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--cyan);
  padding-left: 6px;
}

.page-about .about-toc__list li:last-child a {
  border-bottom: none;
}

.page-about .about-chapters {
  display: flex;
  flex-direction: column;
  gap: clamp(36px, 6vw, 72px);
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .chapter {
  position: relative;
  padding-top: clamp(24px, 4vw, 40px);
  border-top: 1px solid var(--line);
  scroll-margin-top: 24px;
}

.page-about .chapter:first-child {
  border-top: none;
  padding-top: 0;
}

.page-about .chapter__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  margin-bottom: clamp(16px, 3vw, 26px);
}

.page-about .chapter__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  font-family: var(--font-num);
  font-size: 22px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  border: 2px solid var(--cyan);
  background: rgba(57, 243, 206, 0.06);
  box-shadow: 3px 3px 0 rgba(57, 243, 206, 0.16);
}

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

.page-about .chapter__label {
  margin: 4px 0 6px;
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.36rem, 2.6vw, 2.05rem);
  line-height: 1.2;
  letter-spacing: -0.004em;
  color: var(--paper);
}

.page-about .chapter__body {
  display: grid;
  gap: clamp(16px, 3vw, 26px);
  font-size: clamp(0.96rem, 1.2vw, 1.04rem);
  line-height: 1.78;
}

.page-about .chapter__body p {
  margin: 0;
  color: var(--paper);
  opacity: 0.9;
}

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

/* 要点列表 */
.page-about .chapter__points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .chapter__points li {
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--line);
  background: rgba(12, 43, 35, 0.55);
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--paper);
  transition: border-left-color 180ms ease, transform 180ms ease;
}

.page-about .chapter__points li:hover {
  border-left-color: var(--cyan);
  transform: translateX(3px);
}

.page-about .chapter__points strong {
  display: inline-block;
  min-width: 88px;
  font-family: var(--font-num);
  font-size: 16px;
  letter-spacing: 0.04em;
  color: var(--amber);
}

/* 流程 */
.page-about .flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  counter-reset: flowstep;
}

.page-about .flow__step {
  position: relative;
  padding: 16px 18px 16px 56px;
  border: 1px solid var(--line);
  background: linear-gradient(120deg, rgba(18, 59, 48, 0.55), rgba(6, 23, 19, 0.55));
  counter-increment: flowstep;
}

.page-about .flow__step::before {
  content: counter(flowstep, decimal-leading-zero);
  position: absolute;
  left: 16px;
  top: 16px;
  font-family: var(--font-num);
  font-size: 22px;
  letter-spacing: 0.04em;
  color: var(--cyan);
  line-height: 1;
}

.page-about .flow__idx {
  display: block;
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 4px;
}

.page-about .flow__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.06rem;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .flow__step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--paper);
  opacity: 0.85;
}

/* 配图 */
.page-about .about-figure {
  margin: 0;
  border: 2px solid var(--line);
  background: var(--ink-2);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-figure--wide img {
  aspect-ratio: 14 / 9;
}

.page-about .about-figure figcaption {
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

/* 时间轴 */
.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 8px 0 4px 28px;
  display: grid;
  gap: 22px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(to bottom, var(--cyan), var(--line) 70%, transparent);
}

.page-about .milestone {
  position: relative;
  padding: 14px 16px;
  border: 1px solid var(--line);
  background: rgba(12, 43, 35, 0.5);
  transition: border-color 200ms ease, transform 200ms ease;
}

.page-about .milestone::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 20px;
  width: 14px;
  height: 14px;
  box-sizing: border-box;
  border: 2px solid var(--cyan);
  background: var(--ink);
  transform: rotate(45deg);
  transition: background-color 200ms ease;
}

.page-about .milestone:hover,
.page-about .milestone:focus-within {
  border-color: var(--cyan);
  transform: translateX(3px);
}

.page-about .milestone:hover::before {
  background: var(--cyan);
}

.page-about .milestone__year {
  margin: 0 0 4px;
  font-family: var(--font-num);
  font-size: clamp(1.9rem, 4.6vw, 2.9rem);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--amber);
}

.page-about .milestone__stage {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .milestone__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--paper);
  opacity: 0.87;
}

/* 团队 */
.page-about .team {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .team__card {
  padding: 14px 14px 16px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--cyan);
  background: rgba(18, 59, 48, 0.45);
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: border-top-color 200ms ease, transform 200ms ease;
}

.page-about .team__card:hover {
  border-top-color: var(--amber);
  transform: translateY(-2px);
}

.page-about .team__num {
  margin: 0;
  font-family: var(--font-num);
  font-size: clamp(1.7rem, 3.4vw, 2.3rem);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--amber);
}

.page-about .team__role {
  margin: 2px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--paper);
}

.page-about .team__desc {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
}

/* 四段式结构 */
.page-about .struct {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .struct__item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  column-gap: 12px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  background: rgba(36, 27, 77, 0.28);
}

.page-about .struct__num {
  grid-row: 1 / span 2;
  font-family: var(--font-num);
  font-size: 20px;
  letter-spacing: 0.04em;
  color: var(--cyan);
  align-self: center;
}

.page-about .struct__name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .struct__desc {
  margin: 2px 0 0;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--muted);
}

/* 下一步索引 */
.page-about .next-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .next-link__a {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  grid-template-rows: auto auto;
  column-gap: 12px;
  row-gap: 2px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  background: rgba(12, 43, 35, 0.55);
  text-decoration: none;
  color: var(--paper);
  transition: transform 180ms ease, background-color 180ms ease, border-left-color 180ms ease;
}

.page-about .next-link__a:hover,
.page-about .next-link__a:focus-visible {
  background: rgba(18, 59, 48, 0.8);
  border-left-color: var(--amber);
  transform: translateX(4px);
  color: var(--paper);
}

.page-about .next-link__idx {
  grid-row: 1 / span 2;
  font-family: var(--font-num);
  font-size: 20px;
  letter-spacing: 0.04em;
  color: var(--amber);
  align-self: center;
}

.page-about .next-link__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .next-link__desc {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .inline-link {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.06em;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 2px;
}

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

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

  .page-about .flow__step {
    padding: 18px 16px 18px 16px;
  }

  .page-about .flow__step::before {
    position: static;
    display: block;
    margin-bottom: 6px;
    font-size: 26px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.9fr);
    gap: clamp(26px, 4vw, 48px);
  }

  .page-about .about-hero__media {
    margin-top: 26px;
  }
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: var(--about-toc-w) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 64px);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: 24px;
  }

  .page-about .chapter__head {
    grid-template-columns: auto minmax(0, 1fr);
    gap: 18px;
  }

  .page-about .chapter__num {
    width: 56px;
    height: 56px;
    font-size: 26px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .chapter__points li,
  .page-about .milestone,
  .page-about .team__card,
  .page-about .next-link__a,
  .page-about .about-toc__list a {
    transition: none;
  }

  .page-about .chapter__points li:hover,
  .page-about .milestone:hover,
  .page-about .team__card:hover,
  .page-about .next-link__a:hover {
    transform: none;
  }
}
<<<END>>>