.page-about {
  --about-pad: clamp(48px, 7vw, 104px);
  --about-pad-inline: clamp(16px, 2.4vw, 40px);
  --about-hair: rgba(243, 246, 248, .14);
  --about-rail-w: 176px;
  background: var(--ink);
  color: var(--white);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-block: 20px 2px;
  padding-inline: var(--gutter);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(24px, 4vw, 48px) clamp(48px, 7vw, 96px);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(104deg, transparent 0 60%, rgba(52, 245, 208, .05) 60% 100%),
    radial-gradient(120% 90% at 90% -20%, rgba(255, 122, 26, .10), transparent 62%);
}

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

.page-about .about-hero__title {
  margin: 16px 0 0;
  font-family: var(--font-head);
  font-size: clamp(52px, 13vw, 124px);
  font-weight: 300;
  line-height: .92;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .about-hero__body {
  margin-top: clamp(26px, 4vw, 52px);
  display: grid;
  gap: clamp(24px, 3.4vw, 48px);
}

.page-about .about-hero__lead {
  font-size: 17px;
  line-height: 1.85;
  color: var(--silver);
  max-width: 38em;
  margin: 0;
}

.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-facts > li {
  background: var(--ink);
  padding: 16px 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-facts .data-figure {
  font-size: clamp(20px, 2.4vw, 28px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-facts__label {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--silver-dim);
}

/* ---------- 主栅格：索引列 + 内容流 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.page-about .about-rail {
  border-bottom: 1px solid var(--line);
  background: var(--ink);
}

.page-about .about-rail__title {
  margin: 18px 0 8px;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 14px;
  display: flex;
  gap: 18px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  padding: 6px 2px;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--silver-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .24s var(--ease), border-color .24s var(--ease);
}

.page-about .about-rail__link .mono {
  font-size: 11px;
  color: var(--silver-dim);
  transition: color .24s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--white);
  border-bottom-color: var(--line);
}

.page-about .about-rail__link.is-current {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .about-rail__link.is-current .mono {
  color: var(--orange);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  padding-block: var(--about-pad);
  padding-inline: var(--about-pad-inline);
  border-bottom: 1px solid var(--line);
}

.page-about .about-sec--teal {
  background: var(--teal-deep);
}

.page-about .about-sec--panel {
  background: var(--panel);
}

.page-about .about-sec--indigo {
  background: var(--indigo);
}

.page-about .about-sec__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(12px, 2vw, 28px);
  align-items: start;
  margin-bottom: clamp(26px, 4vw, 52px);
}

.page-about .about-sec__num {
  font-family: var(--font-head);
  font-size: clamp(44px, 7.5vw, 96px);
  font-weight: 200;
  line-height: .8;
  letter-spacing: -.02em;
  color: var(--silver-dim);
  opacity: .55;
  font-variant-numeric: tabular-nums;
}

.page-about .about-sec__title {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-size: clamp(25px, 3.6vw, 44px);
  font-weight: 300;
  line-height: 1.18;
  letter-spacing: .01em;
  color: var(--white);
  max-width: 20em;
}

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

.page-about .about-lead {
  margin: 0;
  font-size: 17px;
  line-height: 1.85;
  color: var(--silver);
  max-width: 36em;
}

.page-about .about-prose p + p {
  margin-top: 16px;
}

.page-about .about-note {
  margin: clamp(20px, 3vw, 32px) 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--silver-dim);
  max-width: 40em;
  padding-left: 14px;
  border-left: 2px solid var(--line);
}

/* ---------- 01 四块内容 ---------- */
.page-about .about-cards {
  margin-top: clamp(26px, 3.6vw, 44px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-card {
  background: var(--ink);
  padding: clamp(20px, 2.6vw, 30px) clamp(18px, 2.2vw, 26px) clamp(22px, 2.8vw, 32px);
  border-left: 2px solid transparent;
  transition: border-color .24s var(--ease), background .24s var(--ease);
}

.page-about .about-card:hover {
  border-left-color: var(--orange);
  background: var(--panel);
}

.page-about .about-card__tag {
  margin: 0;
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-card__title {
  margin: 12px 0 10px;
  font-family: var(--font-head);
  font-size: clamp(19px, 2.1vw, 24px);
  font-weight: 400;
  line-height: 1.32;
  color: var(--white);
}

.page-about .about-card p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--silver);
}

/* ---------- 02 更新节奏 ---------- */
.page-about .about-rhythm {
  list-style: none;
  margin: clamp(26px, 3.6vw, 44px) 0 0;
  padding: 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-rhythm > li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-rhythm__key {
  font-size: 17px;
  color: var(--orange);
  letter-spacing: .01em;
}

.page-about .about-rhythm__val {
  font-size: 15px;
  line-height: 1.75;
  color: var(--white);
}

/* ---------- 03 覆盖矩阵 ---------- */
.page-about .about-matrix {
  margin-top: clamp(26px, 3.6vw, 44px);
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(178px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

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

.page-about .about-matrix__item:hover {
  background: var(--panel);
}

.page-about .about-matrix__item p {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--silver);
}

.page-about .about-band {
  margin-top: clamp(26px, 3.6vw, 44px);
}

.page-about .about-band img {
  width: 100%;
  display: block;
}

/* ---------- 04 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
  align-items: start;
}

.page-about .about-roles {
  list-style: none;
  margin: clamp(24px, 3.2vw, 36px) 0 0;
  padding: 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-role {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 20px 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-role__num {
  font-size: 12px;
  color: var(--orange);
  padding-top: 5px;
}

.page-about .about-role__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 400;
  line-height: 1.3;
  color: var(--white);
}

.page-about .about-role p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .about-team__place {
  margin: clamp(22px, 3vw, 32px) 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--white);
  max-width: 36em;
}

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

.page-about .about-team__media img {
  width: 100%;
  display: block;
}

/* ---------- 05 时间线 ---------- */
.page-about .about-timeline-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

.page-about .about-timeline__media {
  margin: 0;
  order: 2;
}

.page-about .about-timeline__media img {
  width: 100%;
  display: block;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
  order: 1;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: rgba(243, 246, 248, .18);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: clamp(26px, 3.4vw, 40px);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 9px;
  width: 9px;
  height: 9px;
  background: var(--orange);
}

.page-about .about-timeline__year {
  display: block;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: .01em;
}

.page-about .about-timeline__text h3 {
  margin: 12px 0 8px;
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 400;
  line-height: 1.3;
  color: var(--white);
}

.page-about .about-timeline__text p {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--silver);
}

/* ---------- 06 协作与认可 ---------- */
.page-about .about-collab {
  margin-top: clamp(20px, 3vw, 32px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-collab__item {
  background: var(--ink);
  padding: clamp(22px, 3vw, 34px) clamp(18px, 2.4vw, 30px);
}

.page-about .about-collab__num {
  margin: 0;
  font-size: clamp(26px, 3.6vw, 40px);
  line-height: 1;
  color: var(--orange);
}

.page-about .about-collab__item h3 {
  margin: 14px 0 10px;
  font-family: var(--font-head);
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 400;
  line-height: 1.32;
  color: var(--white);
}

.page-about .about-collab__item p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--silver);
}

.page-about .about-next {
  margin-top: clamp(28px, 3.6vw, 44px);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-rhythm > li {
    grid-template-columns: minmax(140px, 200px) minmax(0, 1fr);
    align-items: baseline;
    gap: 24px;
  }

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

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

@media (min-width: 860px) {
  .page-about .about-hero__body {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }

  .page-about .about-team {
    grid-template-columns: 7fr 5fr;
  }

  .page-about .about-timeline-wrap {
    grid-template-columns: 4fr 6fr;
  }

  .page-about .about-timeline__media {
    order: 1;
    position: sticky;
    top: 140px;
  }

  .page-about .about-timeline {
    order: 2;
  }
}

@media (min-width: 1080px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    column-gap: clamp(24px, 3vw, 56px);
  }

  .page-about .about-rail {
    border-bottom: 0;
  }

  .page-about .about-rail__title {
    margin-top: 0;
  }

  .page-about .about-rail__inner {
    position: sticky;
    top: 140px;
    padding-block: var(--about-pad) 0;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__link {
    width: 100%;
    justify-content: flex-start;
  }

  .page-about .about-sec:first-child {
    padding-top: 0;
  }
}

@media (min-width: 1360px) {
  .page-about .about-facts .data-figure {
    font-size: 30px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-card,
  .page-about .about-matrix__item,
  .page-about .about-rail__link {
    transition: none;
  }
}

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

.page-about .about-collab__item h3 {
  margin-top: 14px;
}

.page-about .about-collab__item p:last-child {
  max-width: 42em;
}

.page-about .about-collab__item + .about-collab__item {
  background: var(--ink);
}
<<<END>>>
</main>