.page-about {
  --about-grid: rgba(67, 96, 124, .13);
  --about-accent-line: rgba(77, 240, 140, .5);
  position: relative;
  overflow-x: clip;
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 880px;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(var(--about-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid) 1px, transparent 1px);
  background-size: 110px 110px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .85), transparent 88%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .85), transparent 88%);
}

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

.page-about > .shell {
  padding-top: clamp(18px, 3vw, 30px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(16px, 3vw, 32px);
  padding-bottom: clamp(30px, 5vw, 56px);
}

.page-about .about-hero__copy {
  max-width: 940px;
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-size: clamp(34px, 6.2vw, 62px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--text-strong);
  max-width: 16ch;
}

.page-about .about-hero__lede {
  margin: clamp(16px, 2.5vw, 26px) 0 0;
  max-width: 64ch;
}

.page-about .about-hero__frame {
  margin: clamp(26px, 4.5vw, 48px) 0 0;
  aspect-ratio: 16 / 7;
  position: relative;
}

.page-about .about-hero__frame .media-frame__media,
.page-about .about-columns__figure .media-frame__media,
.page-about .about-milestones__figure .media-frame__media {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.page-about .media-frame__caption {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text);
  opacity: .78;
}

/* ---------- 章节标题 ---------- */
.page-about .section {
  padding-block: clamp(44px, 7vw, 88px);
}

.page-about .section--tight {
  padding-block: clamp(32px, 5vw, 56px);
}

.page-about .about-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .about-head__title {
  margin: 0;
  font-size: clamp(26px, 3.6vw, 38px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--text-strong);
}

.page-about .about-head__note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--text);
  opacity: .78;
}

@media (min-width: 900px) {
  .page-about .about-head {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    column-gap: 36px;
    align-items: end;
  }
  .page-about .about-head__note {
    padding-bottom: 8px;
  }
}

/* ---------- 非对称双栏 ---------- */
.page-about .about-columns {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

@media (min-width: 900px) {
  .page-about .about-columns {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }
}

.page-about .about-columns__main p {
  margin: 0 0 1.1em;
  font-size: clamp(16px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--text);
}

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

.page-about .about-columns__aside {
  border-top: 1px solid var(--line-soft);
  padding-top: 18px;
}

@media (min-width: 900px) {
  .page-about .about-columns__aside {
    border-top: 0;
    border-left: 1px solid var(--line-soft);
    padding-top: 0;
    padding-left: clamp(18px, 2.6vw, 30px);
  }
}

.page-about .about-aside__label {
  margin: 0 0 14px;
  color: var(--accent);
}

.page-about .about-bullets {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-bullets li {
  position: relative;
  padding-left: 16px;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--text);
}

.page-about .about-bullets li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 8px;
  height: 1px;
  background: var(--accent);
}

.page-about .about-columns__figure {
  margin: 0;
  aspect-ratio: 3 / 2;
}

/* ---------- 数据指标 ---------- */
.page-about .about-metrics {
  list-style: none;
  margin: 0 0 clamp(18px, 3vw, 28px);
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-faint);
  border: 1px solid var(--line-soft);
}

@media (min-width: 620px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-metric {
  background: var(--panel);
  padding: clamp(18px, 2.6vw, 26px);
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: background var(--ease);
}

.page-about .about-metric:hover {
  background: var(--ink-800);
}

.page-about .about-metric__value {
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.4vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--text-strong);
  font-variant-numeric: tabular-nums;
}

.page-about .about-metric__unit {
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--accent);
}

.page-about .about-metric__label {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--text-strong);
}

.page-about .about-metric__desc {
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--text);
  opacity: .86;
}

.page-about .about-source {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--text);
  opacity: .8;
  border-left: 2px solid var(--line);
  padding-left: 14px;
}

/* ---------- 服务范围 ---------- */
.page-about .about-reach {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

@media (min-width: 860px) {
  .page-about .about-reach {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    align-items: start;
  }
}

.page-about .about-reach__figures {
  display: grid;
  gap: 18px;
}

.page-about .about-figure {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line-faint);
}

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

.page-about .about-figure__value {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  min-width: 5.5ch;
}

.page-about .about-figure__label {
  font-size: 14.5px;
  color: var(--text);
}

.page-about .about-reach__text p {
  margin: 0 0 1em;
  font-size: clamp(16px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-audience {
  list-style: none;
  margin: 0 0 1.2em;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-audience li {
  position: relative;
  padding-left: 16px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text);
}

.page-about .about-audience li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .66em;
  width: 7px;
  height: 7px;
  background: var(--accent);
  transform: rotate(45deg);
}

.page-about .about-audience strong {
  color: var(--text-strong);
  font-weight: 600;
}

/* ---------- 赛季时间线 ---------- */
.page-about .about-milestones {
  display: grid;
  gap: clamp(28px, 4vw, 50px);
}

@media (min-width: 900px) {
  .page-about .about-milestones {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }
}

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

.page-about .season-timeline::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--accent) 0%, var(--line-soft) 45%, transparent 100%);
}

.page-about .season-timeline__item {
  position: relative;
  padding: 0 0 0 54px;
  margin-bottom: clamp(20px, 3vw, 32px);
  outline: none;
}

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

.page-about .season-timeline__marker {
  position: absolute;
  left: 0;
  top: 0;
  width: 31px;
  height: 31px;
  display: grid;
  place-items: center;
  font-size: 12px;
  font-weight: 700;
  color: var(--accent);
  background: rgba(77, 240, 140, .14);
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
  transition: background var(--ease), color var(--ease);
}

.page-about .season-timeline__item:hover .season-timeline__marker,
.page-about .season-timeline__item:focus-within .season-timeline__marker {
  background: var(--accent);
  color: var(--ink-900);
}

.page-about .season-timeline__item:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.page-about .season-timeline__title {
  margin: 4px 0 6px;
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--text-strong);
}

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

.page-about .season-timeline__more {
  margin: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--text);
  transition: max-height 220ms ease, opacity 220ms ease, margin-top 220ms ease;
}

.page-about .season-timeline__item:hover .season-timeline__more,
.page-about .season-timeline__item:focus-within .season-timeline__more,
.page-about .season-timeline__item:focus .season-timeline__more {
  max-height: 320px;
  opacity: .84;
  margin-top: 8px;
}

.page-about .about-milestones__figure {
  margin: 0;
  aspect-ratio: 5 / 7;
}

@media (min-width: 900px) {
  .page-about .about-milestones__figure {
    position: sticky;
    top: 92px;
  }
}

/* ---------- 品牌主张 ---------- */
.page-about .creed-grid {
  display: grid;
  gap: clamp(14px, 2.4vw, 22px);
}

@media (min-width: 820px) {
  .page-about .creed-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .creed {
  position: relative;
  margin: 0;
  padding: clamp(22px, 3vw, 32px);
  background: var(--panel);
  border: 1px solid var(--line-soft);
  border-radius: 0;
  transition: background var(--ease), border-color var(--ease);
  outline: none;
}

.page-about .creed::after {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 26px;
  height: 26px;
  background: var(--ink-900);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
}

.page-about .creed:hover,
.page-about .creed:focus-visible {
  background: var(--ink-800);
  border-color: var(--about-accent-line);
}

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

.page-about .creed__num {
  display: block;
  margin-bottom: 16px;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--accent);
}

.page-about .creed__title {
  margin: 0 0 12px;
  font-size: clamp(17px, 2vw, 19px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--text-strong);
}

.page-about .creed__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--text);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-partners__item {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-faint);
}

@media (min-width: 760px) {
  .page-about .about-partners__item {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: 28px;
    align-items: baseline;
    padding: 20px 0;
  }
}

.page-about .about-partners__key {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .01em;
  color: var(--text-strong);
}

.page-about .about-partners__desc {
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text);
  opacity: .88;
}

/* ---------- 结尾入口 ---------- */
.page-about .about-next {
  margin-top: clamp(20px, 4vw, 40px);
  padding: clamp(30px, 5vw, 56px) 0 clamp(24px, 4vw, 44px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-next__title {
  margin: 0 0 10px;
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 800;
  line-height: 1.2;
  color: var(--text-strong);
}

.page-about .about-next__text {
  margin: 0 0 22px;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--text);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 回到顶部 ---------- */
.page-about .about-top {
  position: fixed;
  right: clamp(14px, 3vw, 28px);
  bottom: clamp(14px, 3vw, 28px);
  z-index: 40;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 14px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--text);
  background: rgba(12, 21, 38, .92);
  border: 1px solid var(--line-soft);
  text-decoration: none;
  transition: color var(--ease), border-color var(--ease);
}

.page-about .about-top:hover,
.page-about .about-top:focus-visible {
  color: var(--accent);
  border-color: var(--about-accent-line);
}

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

@media (max-width: 480px) {
  .page-about .about-top {
    padding: 8px 11px;
    font-size: 12px;
  }
}
<<<END>>>