.page-about {
  --about-gap: clamp(1.6rem, 4vw, 3.4rem);
  --about-hair: 1px solid rgba(110, 142, 127, 0.26);
  position: relative;
  padding-bottom: clamp(3rem, 7vw, 5.5rem);
  background:
    radial-gradient(95% 46% at 50% 0%, rgba(47, 107, 87, 0.26), transparent 66%),
    radial-gradient(58% 38% at 94% 24%, rgba(122, 90, 248, 0.1), transparent 72%);
  color: var(--text);
}

.page-about .breadcrumb {
  padding-top: clamp(1rem, 3vw, 1.6rem);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: var(--about-gap);
  align-items: center;
  padding-block: clamp(1.5rem, 4vw, 2.6rem) clamp(2rem, 5vw, 3.6rem);
}

.page-about .about-hero__title {
  margin: 0.6rem 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 6.4vw, 3.7rem);
  line-height: 1.2;
  letter-spacing: 0.01em;
  color: var(--mist);
  text-wrap: balance;
}

.page-about .about-hero__lede {
  margin: 1.1rem 0 0;
  max-width: 46rem;
  font-size: clamp(0.98rem, 2.4vw, 1.1rem);
  line-height: 1.85;
  color: var(--text-soft);
}

.page-about .about-hero__plates {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.5rem;
}

.page-about .about-plate {
  min-width: 7.5rem;
  text-align: left;
}

.page-about .about-hero__anno {
  margin-top: 1.4rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
}

.page-about .about-hero__visual {
  margin: 0;
  position: relative;
  border-radius: var(--radius-lg);
  padding: 0.5rem;
  background: linear-gradient(150deg, rgba(47, 107, 87, 0.32), rgba(10, 15, 13, 0.7) 58%, rgba(63, 167, 196, 0.16));
  border: var(--hair-gold);
}

.page-about .about-hero__visual img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: calc(var(--radius-lg) - 0.45rem);
  object-fit: cover;
}

.page-about .about-hero__caption {
  margin-top: 0.7rem;
  padding-inline: 0.4rem;
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--text-dim);
}

/* ---------- 双栏正文 ---------- */
.page-about .about-body {
  display: grid;
  gap: var(--about-gap);
  padding-top: clamp(0.5rem, 2vw, 1.5rem);
}

.page-about .about-toc__title {
  margin: 0 0 0.8rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--moss);
}

.page-about .about-toc__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  padding: 0.42rem 0.75rem;
  border-radius: var(--radius-pill);
  border: var(--about-hair);
  color: var(--text-soft);
  font-size: 0.85rem;
  text-decoration: none;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease), background-color 0.25s var(--ease);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--mist);
  border-color: rgba(216, 180, 90, 0.5);
}

.page-about .about-toc__link[aria-current="true"] {
  color: var(--gold);
  border-color: rgba(216, 180, 90, 0.62);
  background: rgba(47, 107, 87, 0.26);
}

.page-about .about-toc__no {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--moss);
}

.page-about .about-toc__top {
  margin-top: 1.1rem;
  display: inline-flex;
}

.page-about .about-flow {
  display: grid;
  gap: clamp(2.4rem, 6vw, 4.2rem);
  min-width: 0;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  min-width: 0;
  padding-top: clamp(1rem, 3vw, 1.6rem);
  border-top: var(--hair-gold);
}

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

.page-about .about-sec__title {
  margin: 0.5rem 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.45rem, 4vw, 2.15rem);
  line-height: 1.32;
  color: var(--mist);
  text-wrap: balance;
}

.page-about .about-sec__lede {
  margin: 0.85rem 0 0;
  max-width: 44rem;
  font-size: 0.97rem;
  line-height: 1.85;
  color: var(--text-soft);
}

.page-about .about-sec__prose {
  margin-top: 1.2rem;
}

.page-about .about-sec__prose p {
  margin: 0 0 1rem;
  font-size: 0.97rem;
  line-height: 1.9;
  color: var(--text-soft);
}

/* ---------- 品牌主张 ---------- */
.page-about .creed__quote {
  margin: 1.4rem 0 0;
  padding: 1.1rem 1.2rem 1.1rem 2.4rem;
  position: relative;
  border-left: 2px solid var(--gold);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: linear-gradient(100deg, rgba(47, 107, 87, 0.2), rgba(10, 15, 13, 0));
}

.page-about .creed__quote p {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1rem, 2.6vw, 1.2rem);
  line-height: 1.75;
  color: var(--mist);
}

.page-about .creed__mark {
  position: absolute;
  left: 0.7rem;
  top: 0.85rem;
  color: var(--gold);
  font-size: 1.1rem;
  line-height: 1;
}

/* ---------- 团队角色 ---------- */
.page-about .roles {
  display: grid;
  gap: var(--about-gap);
  margin-top: 1.5rem;
}

.page-about .role-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.55rem;
  min-width: 0;
}

.page-about .role {
  border-radius: var(--radius-md);
  border: var(--about-hair);
  background: linear-gradient(120deg, rgba(20, 37, 31, 0.82), rgba(10, 15, 13, 0.55));
  transition: border-color 0.25s var(--ease), background-color 0.25s var(--ease);
}

.page-about .role[open] {
  border-color: rgba(216, 180, 90, 0.42);
  background: linear-gradient(120deg, rgba(20, 37, 31, 0.95), rgba(47, 107, 87, 0.18));
}

.page-about .role summary {
  display: grid;
  grid-template-columns: 2.1rem 1fr;
  grid-template-areas:
    "no name"
    "no line";
  gap: 0.15rem 0.75rem;
  padding: 0.85rem 0.95rem;
  cursor: pointer;
  list-style: none;
}

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

.page-about .role__no {
  grid-area: no;
  align-self: center;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--gold);
}

.page-about .role__name {
  grid-area: name;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--mist);
}

.page-about .role__line {
  grid-area: line;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--text-dim);
}

.page-about .role__body {
  padding: 0 0.95rem 1rem 3.8rem;
}

.page-about .role__body p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.85;
  color: var(--text-soft);
}

.page-about .roles__figure {
  margin: 0;
  border-radius: var(--radius-lg);
  padding: 0.5rem;
  border: var(--about-hair);
  background: linear-gradient(160deg, rgba(63, 167, 196, 0.14), rgba(10, 15, 13, 0.6));
}

.page-about .roles__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: calc(var(--radius-lg) - 0.45rem);
  object-fit: cover;
}

.page-about .roles__cap {
  margin-top: 0.65rem;
  padding-inline: 0.4rem;
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--text-dim);
}

/* ---------- 轮次节奏 ---------- */
.page-about .cadence__list {
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1.1rem;
  position: relative;
}

.page-about .cadence__step {
  display: grid;
  grid-template-columns: 2.6rem 1fr;
  gap: 0.9rem;
  align-items: start;
  padding-bottom: 1.1rem;
  border-bottom: 1px dashed rgba(110, 142, 127, 0.22);
}

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

.page-about .cadence__ring {
  position: relative;
  width: 2.6rem;
  height: 2.6rem;
  border-radius: 50%;
  border: 1px solid rgba(216, 180, 90, 0.55);
  display: grid;
  place-items: center;
}

.page-about .cadence__ring::before {
  content: "";
  position: absolute;
  inset: 0.3rem;
  border-radius: 50%;
  border: 1px solid rgba(63, 167, 196, 0.42);
}

.page-about .cadence__ring span {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--gold);
  letter-spacing: 0.04em;
}

.page-about .cadence__body h3 {
  margin: 0.25rem 0 0.45rem;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--mist);
}

.page-about .cadence__body p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.85;
  color: var(--text-soft);
}

.page-about .cadence__links,
.page-about .principles__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.5rem;
}

/* ---------- 服务准则 ---------- */
.page-about .principle-list {
  margin: 1.4rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1.3rem;
}

.page-about .principle {
  display: grid;
  grid-template-columns: 2.6rem 1fr;
  gap: 0.35rem 1rem;
  padding-left: 0.2rem;
  border-left: 2px solid rgba(216, 180, 90, 0.24);
}

.page-about .principle__no {
  grid-row: span 2;
  font-family: var(--font-display);
  font-size: 1.5rem;
  line-height: 1.2;
  color: rgba(216, 180, 90, 0.72);
}

.page-about .principle__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--mist);
}

.page-about .principle__text {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.85;
  color: var(--text-soft);
}

/* ---------- 发展历程 ---------- */
.page-about .timeline-wrap {
  display: grid;
  gap: var(--about-gap);
  margin-top: 1.6rem;
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0.3rem 0 0.3rem 1.9rem;
  list-style: none;
  display: grid;
  gap: 1.8rem;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0.5rem;
  top: 0.4rem;
  bottom: 0.4rem;
  width: 1px;
  background: linear-gradient(180deg, rgba(216, 180, 90, 0.7), rgba(47, 107, 87, 0.55) 55%, rgba(63, 167, 196, 0.22));
}

.page-about .about-timeline__item {
  position: relative;
  min-width: 0;
  outline: none;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -1.63rem;
  top: 0.55rem;
  width: 0.62rem;
  height: 0.62rem;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--gold);
}

.page-about .about-timeline__item:focus-visible::before {
  box-shadow: 0 0 0 4px rgba(216, 180, 90, 0.25);
}

.page-about .about-timeline__stamp {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .about-timeline__title {
  margin: 0.35rem 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--mist);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.85;
  color: var(--text-soft);
}

.page-about .about-timeline__more {
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--moss);
  transition: max-height 0.4s var(--ease), opacity 0.35s var(--ease), margin-top 0.35s var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__more,
.page-about .about-timeline__item:focus-within .about-timeline__more,
.page-about .about-timeline__item:focus .about-timeline__more {
  max-height: 12rem;
  opacity: 1;
  margin-top: 0.55rem;
}

.page-about .timeline-figure {
  margin: 0;
  border-radius: var(--radius-lg);
  padding: 0.5rem;
  border: var(--hair-gold);
  background: linear-gradient(180deg, rgba(47, 107, 87, 0.2), rgba(10, 15, 13, 0.65));
  align-self: start;
}

.page-about .timeline-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: calc(var(--radius-lg) - 0.45rem);
  object-fit: cover;
}

.page-about .timeline-figure__cap {
  margin-top: 0.65rem;
  padding-inline: 0.4rem;
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--text-dim);
}

/* ---------- 下一步 ---------- */
.page-about .next-list {
  margin: 1.4rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
}

.page-about .next-item {
  display: grid;
  grid-template-columns: 2.4rem 1fr;
  grid-template-areas:
    "no link"
    "no desc";
  gap: 0.2rem 0.9rem;
  padding: 1rem 0.2rem;
  border-bottom: var(--about-hair);
  transition: background-color 0.25s var(--ease), padding-left 0.25s var(--ease);
}

.page-about .next-item:hover {
  background: linear-gradient(90deg, rgba(47, 107, 87, 0.18), transparent 70%);
  padding-left: 0.6rem;
}

.page-about .next-item__no {
  grid-area: no;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--gold);
  padding-top: 0.28rem;
}

.page-about .next-item__link {
  grid-area: link;
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  justify-self: start;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .next-item__link:hover,
.page-about .next-item__link:focus-visible {
  color: var(--gold);
  border-color: rgba(216, 180, 90, 0.6);
}

.page-about .next-item__desc {
  grid-area: desc;
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--text-soft);
}

/* ---------- 桌面增强 ---------- */
@media (min-width: 760px) {
  .page-about .roles {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .timeline-wrap {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    align-items: start;
  }

  .page-about .principle-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.6rem;
  }

  .page-about .principle {
    grid-template-columns: 1fr;
    gap: 0.4rem;
    border-left: 0;
    border-top: 2px solid rgba(216, 180, 90, 0.28);
    padding: 0.9rem 0 0;
  }

  .page-about .principle__no {
    grid-row: auto;
    font-size: 1.7rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: clamp(2rem, 5vw, 4rem);
  }

  .page-about .about-hero__anno {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    height: 9rem;
    border-left: 1px solid rgba(216, 180, 90, 0.3);
    padding-left: 0.7rem;
  }

  .page-about .about-body {
    grid-template-columns: minmax(0, 12rem) minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 3.6rem);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--header-h) + 1.4rem);
  }

  .page-about .about-toc__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0.15rem;
  }

  .page-about .about-toc__link {
    border-radius: 0.5rem;
    border-color: transparent;
    border-left: 2px solid rgba(110, 142, 127, 0.3);
    padding: 0.5rem 0.7rem;
  }
}

@media (min-width: 1180px) {
  .page-about .about-body {
    grid-template-columns: minmax(0, 13rem) minmax(0, 1fr);
  }

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

@media (max-width: 480px) {
  .page-about .role summary {
    grid-template-columns: 1.6rem 1fr;
    padding: 0.75rem 0.8rem;
  }

  .page-about .role__body {
    padding: 0 0.8rem 0.9rem 3rem;
  }

  .page-about .cadence__step {
    grid-template-columns: 2.1rem 1fr;
    gap: 0.7rem;
  }

  .page-about .cadence__ring {
    width: 2.1rem;
    height: 2.1rem;
  }

  .page-about .cadence__ring span {
    font-size: 0.62rem;
  }

  .page-about .about-timeline {
    padding-left: 1.5rem;
  }

  .page-about .about-timeline__item::before {
    left: -1.32rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__more,
  .page-about .role,
  .page-about .next-item,
  .page-about .about-toc__link {
    transition: none;
  }
}
<<<END>>>