.page-about {
  --about-rail: 236px;
  --about-gap: clamp(1.75rem, 4vw, 3.5rem);
  background-color: var(--bg-base);
  color: var(--paper);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(1.5rem, 4vw, 3rem) clamp(1.75rem, 4.5vw, 3rem);
  background:
    radial-gradient(130% 95% at 12% -10%, rgba(0, 229, 212, 0.12), transparent 58%),
    linear-gradient(180deg, var(--bg-deep) 0%, var(--bg-base) 100%);
  border-bottom: var(--border-w) solid var(--line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(30, 58, 95, 0.42) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 58, 95, 0.42) 1px, transparent 1px);
  background-size: 68px 68px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), transparent 72%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), transparent 72%);
}

.page-about .about-hero-grid,
.page-about .about-hero .container {
  position: relative;
  z-index: 1;
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.5rem);
  align-items: start;
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(270px, 0.85fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }
}

.page-about .about-kicker {
  margin: 0 0 0.7rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .about-hero h1 {
  margin: 0 0 1.1rem;
  max-width: 22ch;
  font-size: clamp(2rem, 5.4vw, 3.7rem);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.022em;
  color: var(--paper);
}

.page-about .about-hero .lede {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(1rem, 1.4vw, 1.12rem);
  line-height: 1.85;
  color: var(--paper);
}

.page-about .about-hero-panel {
  border: var(--border-w) solid var(--line);
  background: linear-gradient(180deg, rgba(22, 41, 74, 0.92), rgba(10, 20, 36, 0.92));
  box-shadow: var(--shadow-hard);
  padding: clamp(1rem, 2vw, 1.4rem);
}

.page-about .hero-panel-title {
  margin: 0 0 0.85rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--line);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-about .hero-facts {
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .hero-facts > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.6rem 0;
  border-bottom: 1px dashed var(--line);
}

.page-about .hero-facts > div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .hero-facts dt {
  font-size: 0.88rem;
  color: var(--muted);
}

.page-about .hero-facts dd {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .hero-facts dd.num {
  font-family: var(--font-num);
  color: var(--cyan);
  letter-spacing: -0.01em;
}

.page-about .about-banner {
  position: relative;
  margin: clamp(1.5rem, 4vw, 2.5rem) 0 0;
  border: var(--border-w) solid var(--line);
  background: var(--bg-abyss);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

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

.page-about .media-caption {
  display: block;
  padding: 0.7rem 1rem;
  border-top: 1px solid var(--line);
  background: var(--bg-abyss);
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.6;
}

/* ---------- 主体两栏 ---------- */

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.5rem);
  padding-block: clamp(2rem, 5vw, 3.5rem) clamp(2rem, 5vw, 3.5rem);
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
  }
}

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

@media (min-width: 960px) {
  .page-about .about-rail {
    position: sticky;
    top: 104px;
  }
}

.page-about .about-index {
  display: flex;
  gap: 0;
  margin: 0;
  padding: 0.2rem 0;
  overflow-x: auto;
  border-top: var(--border-w) solid var(--line);
  border-bottom: var(--border-w) solid var(--line);
  scrollbar-width: none;
}

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

@media (min-width: 960px) {
  .page-about .about-index {
    flex-direction: column;
    overflow: visible;
    padding: 0;
    border: 0;
  }
}

.page-about .index-head {
  display: none;
  margin: 0 0 0.55rem;
  padding-left: 1.1rem;
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  color: var(--muted);
}

@media (min-width: 960px) {
  .page-about .index-head {
    display: block;
  }
}

.page-about .about-index .index-link {
  flex: 0 0 auto;
  display: block;
  padding: 0.6rem 1rem;
  border-left: 0;
  border-bottom: 2px solid transparent;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.35;
  white-space: nowrap;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

@media (min-width: 960px) {
  .page-about .about-index .index-link {
    padding: 0.62rem 1rem 0.62rem 1.1rem;
    border-left: 2px solid var(--line);
    border-bottom: 0;
    white-space: normal;
  }
}

.page-about .about-index .index-link:hover {
  color: var(--paper);
}

.page-about .about-index .index-link.is-active,
.page-about .about-index .index-link[aria-current="true"],
.page-about .about-index .index-link[aria-current="location"] {
  color: var(--cyan);
  border-color: var(--cyan);
  background: linear-gradient(90deg, rgba(0, 229, 212, 0.14), transparent 82%);
}

.page-about .about-stream {
  display: grid;
  gap: clamp(2.5rem, 6vw, 4.25rem);
  min-width: 0;
}

/* ---------- 通用章节 ---------- */

.page-about .about-block {
  padding-top: clamp(1.25rem, 3vw, 1.9rem);
  border-top: var(--border-w) solid var(--line);
  scroll-margin-top: 108px;
}

.page-about .about-block-head {
  margin-bottom: clamp(1.1rem, 2.5vw, 1.6rem);
}

.page-about .about-stream h2 {
  margin: 0;
  max-width: 28ch;
  font-size: clamp(1.45rem, 3.2vw, 2.3rem);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.012em;
  color: var(--paper);
}

.page-about .about-sub {
  margin: 0.85rem 0 0;
  max-width: 64ch;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-prose p {
  margin: 0 0 1rem;
  max-width: 68ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--paper);
}

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

/* ---------- 起点：年份刻度 ---------- */

.page-about .origin-scale {
  list-style: none;
  margin: 1.9rem 0 0;
  padding: 0 0 0 1.5rem;
  border-left: var(--border-w) solid var(--line);
}

.page-about .origin-scale > li {
  position: relative;
  padding: 0 0 1.6rem;
}

.page-about .origin-scale > li:last-child {
  padding-bottom: 0;
}

.page-about .origin-scale > li::before {
  content: "";
  position: absolute;
  left: -1.9rem;
  top: 0.4rem;
  width: 10px;
  height: 10px;
  border: 2px solid var(--cyan);
  border-radius: 50%;
  background: var(--bg-base);
}

.page-about .origin-scale > li:last-child::before {
  background: var(--cyan);
  box-shadow: var(--glow-cyan);
}

.page-about .scale-year {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(1.15rem, 2.4vw, 1.6rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .scale-text {
  margin-top: 0.35rem;
}

.page-about .scale-text strong {
  display: block;
  margin-bottom: 0.2rem;
  font-size: 0.95rem;
  color: var(--paper);
}

.page-about .scale-text p {
  margin: 0;
  max-width: 60ch;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 整理链路 ---------- */

.page-about .pipe {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.85rem;
}

@media (min-width: 700px) {
  .page-about .pipe {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1180px) {
  .page-about .pipe {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .pipe-step {
  position: relative;
  padding: 1.1rem 1.1rem 1.2rem;
  border: var(--border-w) solid var(--line);
  border-top: 3px solid var(--line-strong);
  background: var(--panel);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.42);
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-about .pipe-step:hover {
  border-color: var(--line-strong);
  border-left-color: var(--cyan);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.5), var(--glow-cyan);
}

.page-about .pipe-idx {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.2rem;
  height: 2.2rem;
  padding: 0 0.45rem;
  margin-bottom: 0.8rem;
  border: 1px solid var(--line-strong);
  font-family: var(--font-num);
  font-size: 0.85rem;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-about .pipe-step h3 {
  margin: 0 0 0.45rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .pipe-step p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 团队 ---------- */

.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.25rem, 3vw, 2rem);
}

@media (min-width: 900px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

.page-about .team-copy p {
  margin: 0 0 1rem;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--paper);
}

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

.page-about .team-figure {
  margin: 0;
  border: var(--border-w) solid var(--line);
  background: var(--bg-abyss);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .team-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .shift-list {
  list-style: none;
  margin: 1.6rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.75rem;
}

@media (min-width: 760px) {
  .page-about .shift-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .shift-list > li {
  padding: 1rem 1.1rem;
  border: var(--border-w) solid var(--line);
  border-top-width: 3px;
  background: var(--bg-deep);
}

.page-about .shift-list > li:nth-child(1) {
  border-top-color: var(--sage);
}

.page-about .shift-list > li:nth-child(2) {
  border-top-color: var(--orange);
}

.page-about .shift-list > li:nth-child(3) {
  border-top-color: var(--cyan);
}

.page-about .shift-name {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--paper);
}

.page-about .shift-list p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 版本演进 ---------- */

.page-about .version-figure {
  margin: 0 0 1.5rem;
  border: var(--border-w) solid var(--line);
  background: var(--bg-abyss);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .version-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .version-line {
  display: grid;
  gap: 0.85rem;
}

.page-about .ver-item {
  border: var(--border-w) solid var(--line);
  background: var(--panel);
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-about .ver-item[open] {
  border-color: var(--line-strong);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.45);
}

.page-about .ver-item > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4rem 0.9rem;
  padding: 1rem 1.1rem;
  cursor: pointer;
  list-style: none;
}

.page-about .ver-item > summary::-webkit-details-marker {
  display: none;
}

.page-about .ver-item > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-num);
  font-size: 1.15rem;
  line-height: 1;
  color: var(--cyan);
}

.page-about .ver-item[open] > summary::after {
  content: "\2212";
}

.page-about .ver-tag {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border: 1px solid var(--cyan);
  font-family: var(--font-num);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-about .ver-when {
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .ver-title {
  flex: 1 1 12rem;
  min-width: 0;
  font-size: 1rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .ver-body {
  padding: 0 1.1rem 1.15rem;
  border-top: 1px solid var(--line);
}

.page-about .ver-body p {
  margin: 0.85rem 0 0;
  max-width: 66ch;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 覆盖范围 ---------- */

.page-about .coverage-figures {
  list-style: none;
  margin: 0 0 clamp(1.6rem, 4vw, 2.4rem);
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: var(--border-w) solid var(--line);
  background: var(--line);
}

@media (min-width: 760px) {
  .page-about .coverage-figures {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .coverage-figures > li {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 1.05rem 1.1rem;
  background: var(--bg-deep);
}

.page-about .fig-num {
  font-family: var(--font-num);
  font-size: clamp(1.5rem, 3.4vw, 2.15rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .coverage-figures > li:nth-child(2) .fig-num,
.page-about .coverage-figures > li:nth-child(5) .fig-num {
  color: var(--orange);
}

.page-about .coverage-figures > li:nth-child(4) .fig-num {
  color: var(--sage);
}

.page-about .fig-label {
  font-size: 0.86rem;
  line-height: 1.55;
  color: var(--muted);
}

.page-about .coverage-block h3,
.page-about .promise-block h3 {
  margin: 0 0 0.6rem;
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .coverage-block > p {
  margin: 0;
  max-width: 66ch;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-filter {
  margin: 1.2rem 0 0.35rem;
}

.page-about .sport-list {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.5rem;
}

@media (min-width: 640px) {
  .page-about .sport-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1040px) {
  .page-about .sport-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .sport-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--line);
  border-left: 3px solid var(--line-strong);
  background: var(--bg-deep);
}

.page-about .sport-item:hover {
  border-left-color: var(--cyan);
}

.page-about .sport-name {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .sport-kind {
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--muted);
  white-space: nowrap;
}

.page-about .promise-block {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
  padding-top: clamp(1.35rem, 3vw, 1.9rem);
  border-top: var(--border-w) solid var(--line);
}

.page-about .promise-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.page-about .promise-list > li {
  padding: 0.85rem 1rem;
  border-left: 3px solid var(--line-strong);
  background: var(--panel);
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .promise-list > li:nth-child(1) {
  border-left-color: var(--cyan);
}

.page-about .promise-list > li:nth-child(2),
.page-about .promise-list > li:nth-child(3) {
  border-left-color: var(--orange);
}

.page-about .promise-list > li:nth-child(4) {
  border-left-color: var(--sage);
}

.page-about .promise-list strong {
  color: var(--paper);
  font-weight: 700;
}

.page-about .promise-note {
  margin: 1.1rem 0 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .promise-note a {
  color: var(--cyan);
  text-underline-offset: 3px;
}

/* ---------- 结尾 ---------- */

.page-about .about-cta-wrap {
  padding-bottom: clamp(2.5rem, 6vw, 4rem);
}

.page-about .about-cta {
  padding: clamp(1.5rem, 4vw, 2.6rem);
  border: var(--border-w) solid var(--line);
  background:
    linear-gradient(135deg, rgba(0, 229, 212, 0.12), transparent 62%),
    var(--bg-deep);
  box-shadow: var(--shadow-hard);
}

.page-about .about-cta h2 {
  margin: 0 0 0.75rem;
  max-width: 26ch;
  font-size: clamp(1.4rem, 3vw, 2.1rem);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.012em;
  color: var(--paper);
}

.page-about .about-cta p {
  margin: 0 0 1.4rem;
  max-width: 62ch;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.page-about .cta-actions .btn {
  text-decoration: none;
}

@media (max-width: 480px) {
  .page-about .cta-actions .btn {
    flex: 1 1 auto;
    text-align: center;
  }
}
<<<END>>>