.page-about {
  --about-sec-gap: clamp(56px, 9vw, 128px);
  padding-bottom: calc(var(--dock-h) + 48px);
}

.page-about .container {
  max-width: 1280px;
  margin-inline: auto;
  padding-inline: var(--pad-x);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(32px, 6vw, 84px) 0 clamp(24px, 4vw, 44px);
  max-width: 880px;
}

.page-about .about-hero h1 {
  margin: 18px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.1rem, 5.6vw, 3.5rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--c-text);
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.8;
  color: var(--c-muted);
}

.page-about .about-hero__facts {
  margin: 44px 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--c-line-soft);
  border-top: 1px solid var(--c-line-soft);
  border-bottom: 1px solid var(--c-line-soft);
}

.page-about .about-fact {
  background: var(--c-void);
  padding: 18px 16px;
}

.page-about .about-fact dt {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--c-muted);
}

.page-about .about-fact dd {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(24px, 4.4vw, 30px);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--c-cyan);
}

.page-about .about-hero__figure {
  margin: 0 0 clamp(48px, 8vw, 96px);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  border: 1px solid var(--c-line-soft);
  filter: saturate(0.92) contrast(1.03);
}

.page-about .about-hero__figure figcaption {
  margin-top: 10px;
}

/* ---------- 主体栅格 ---------- */
.page-about .about-body {
  display: block;
}

.page-about .about-index {
  display: none;
}

.page-about .about-index__title {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--c-muted);
}

.page-about .about-index .index-rail {
  display: flex;
  flex-direction: column;
}

.page-about .about-index .index-rail__link {
  padding: 8px 0 8px 14px;
  font-size: 13px;
  line-height: 1.4;
  color: var(--c-muted);
  text-decoration: none;
  border-left: 1px solid var(--c-line-soft);
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-index .index-rail__link:hover,
.page-about .about-index .index-rail__link:focus-visible {
  color: var(--c-cyan-soft);
  border-left-color: var(--c-cyan);
}

.page-about .about-index .index-rail__link[aria-current],
.page-about .about-index .index-rail__link.is-current {
  color: var(--c-cyan);
  border-left-color: var(--c-cyan);
}

@media (min-width: 1024px) {
  .page-about .about-body {
    display: grid;
    grid-template-columns: 152px minmax(0, 1fr);
    column-gap: clamp(40px, 6vw, 80px);
    align-items: start;
  }

  .page-about .about-index {
    display: block;
    position: sticky;
    top: calc(var(--ticker-h) + 32px);
  }
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding-top: var(--about-sec-gap);
  scroll-margin-top: calc(var(--ticker-h) + 24px);
}

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

.page-about .about-lede {
  margin: 0 0 clamp(28px, 4vw, 44px);
  max-width: 62ch;
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--c-muted);
}

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

.page-about .tl::before {
  content: "";
  position: absolute;
  top: 14px;
  bottom: 34px;
  left: 7px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-cyan) 0%, var(--c-line) 26%, var(--c-line) 100%);
}

.page-about .tl__node {
  position: relative;
  padding: 0 0 clamp(26px, 3.6vw, 40px) 34px;
}

.page-about .tl__node::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 14px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-cyan);
  box-shadow: 0 0 0 3px rgba(43, 232, 184, 0.12);
}

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

.page-about .tl__node:last-child::before {
  box-shadow: 0 0 0 5px rgba(43, 232, 184, 0.18);
}

.page-about .tl__year {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: clamp(30px, 6vw, 44px);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-text);
  opacity: 0.36;
}

.page-about .tl__node:last-child .tl__year {
  color: var(--c-cyan);
  opacity: 1;
}

.page-about .tl__item {
  background: transparent;
  border: 0;
}

.page-about .tl__trigger {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  width: 100%;
  padding: 0;
  border: 0;
  background: none;
  text-align: left;
  cursor: pointer;
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 500;
  line-height: 1.6;
}

.page-about .tl__trigger .expandable__label {
  flex: 1 1 auto;
}

.page-about .tl__trigger .expandable__chev {
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  margin-top: 8px;
  border-right: 1px solid var(--c-cyan);
  border-bottom: 1px solid var(--c-cyan);
  transform: rotate(45deg);
  transition: transform 220ms var(--ease);
}

.page-about .tl__trigger[aria-expanded="true"] .expandable__chev {
  transform: rotate(-135deg);
}

.page-about .tl__panel {
  margin-top: 14px;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--c-muted);
}

.page-about .tl__panel p {
  margin: 0;
}

@media (min-width: 768px) {
  .page-about .tl__node {
    display: grid;
    grid-template-columns: 118px minmax(0, 1fr);
    column-gap: 24px;
    align-items: start;
  }

  .page-about .tl__year {
    margin-bottom: 0;
    margin-top: -6px;
  }

  .page-about .tl__item {
    grid-column: 2;
  }
}

/* ---------- 团队分工 ---------- */
.page-about .crew {
  border-top: 1px solid var(--c-line-soft);
}

.page-about .crew__item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  grid-template-areas:
    "idx trigger"
    "idx line"
    "panel panel";
  align-items: start;
  padding: 26px 0;
  border-bottom: 1px solid var(--c-line-soft);
}

.page-about .crew__idx {
  grid-area: idx;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--c-cyan);
}

.page-about .crew__trigger {
  grid-area: trigger;
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 0;
  border: 0;
  background: none;
  text-align: left;
  cursor: pointer;
  color: var(--c-text);
  font-family: var(--font-display);
  font-size: clamp(19px, 3.2vw, 23px);
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.3;
}

.page-about .crew__trigger .expandable__label {
  flex: 1 1 auto;
}

.page-about .crew__count {
  font-family: var(--font-mono);
  font-size: 0.92em;
  font-variant-numeric: tabular-nums;
  color: var(--c-cyan);
}

.page-about .crew__trigger .expandable__chev {
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  border-right: 1px solid var(--c-cyan);
  border-bottom: 1px solid var(--c-cyan);
  transform: rotate(45deg);
  transition: transform 220ms var(--ease);
}

.page-about .crew__trigger[aria-expanded="true"] .expandable__chev {
  transform: rotate(-135deg);
}

.page-about .crew__line {
  grid-area: line;
  margin: 9px 0 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-muted);
}

.page-about .crew__item .expandable__panel {
  grid-area: panel;
  margin-top: 14px;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-muted);
}

.page-about .crew__item .expandable__panel p {
  margin: 0;
}

/* ---------- 字段索引 ---------- */
.page-about .fields {
  display: grid;
  gap: clamp(32px, 5vw, 56px);
}

.page-about .fields__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--c-line-soft);
}

.page-about .fields__row {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--c-line-soft);
}

.page-about .fields__no {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-muted);
}

.page-about .fields__name {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--c-text);
}

.page-about .fields__desc {
  margin: 7px 0 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-muted);
}

.page-about .fields__chips {
  margin: 14px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

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

.page-about .fields__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--c-line-soft);
}

.page-about .fields__figure figcaption {
  margin-top: 10px;
}

@media (min-width: 900px) {
  .page-about .fields {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

/* ---------- 观赛时段 ---------- */
.page-about .kickoff {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

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

.page-about .kickoff__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--c-line-soft);
}

.page-about .kickoff__body > p:first-child {
  margin: 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-muted);
}

.page-about .kickoff__list {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--c-line-soft);
}

.page-about .kickoff__list li {
  display: grid;
  grid-template-columns: minmax(76px, auto) minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 15px 0;
  border-bottom: 1px solid var(--c-line-soft);
}

.page-about .kickoff__zone {
  display: inline-block;
  padding: 4px 10px;
  border: 1px solid var(--c-line);
  border-radius: 2px;
  font-size: 12px;
  letter-spacing: 0.12em;
  line-height: 1.4;
  white-space: nowrap;
  color: var(--c-cyan-soft);
}

.page-about .kickoff__desc {
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-muted);
}

.page-about .kickoff__body .annotation {
  display: block;
  margin-top: 18px;
}

@media (min-width: 900px) {
  .page-about .kickoff {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1fr);
    align-items: center;
  }
}

/* ---------- 合作与纠错 ---------- */
.page-about .work {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--c-line-soft);
}

.page-about .work__item {
  display: grid;
  gap: 10px;
  padding: 26px 0;
  border-bottom: 1px solid var(--c-line-soft);
}

.page-about .work__name {
  margin: 0;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--c-cyan);
}

.page-about .work__desc {
  margin: 0;
  max-width: 60ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--c-muted);
}

.page-about .work__cta {
  margin: 28px 0 0;
}

@media (min-width: 768px) {
  .page-about .work__item {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

/* ---------- 收尾 ---------- */
.page-about .about-outro {
  margin-top: var(--about-sec-gap);
  padding: clamp(30px, 5vw, 56px) clamp(24px, 4vw, 48px);
  background: var(--c-panel);
  border: 1px solid var(--c-line-soft);
  border-radius: 2px;
  box-shadow: var(--shadow-1);
}

.page-about .about-outro h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.6vw, 2.1rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.2;
  color: var(--c-text);
}

.page-about .about-outro p {
  margin: 16px 0 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-muted);
}

.page-about .about-outro__actions {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
<<<END>>>