.page-about {
  --about-violet: #1B2A4A;
  --about-gap: clamp(3.2rem, 9vw, 7rem);
  background: var(--ink);
  color: var(--body-text);
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: .5rem;
  padding-top: 1.2rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--mute);
}
.page-about .breadcrumb a {
  color: var(--mute);
  text-decoration: none;
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--cyan);
}
.page-about .breadcrumb .sep {
  color: rgba(169, 189, 182, .5);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  display: flex;
  align-items: flex-end;
  min-height: min(86vh, 760px);
  padding: clamp(3.2rem, 11vw, 6.5rem) 0 clamp(2.4rem, 6vw, 4rem);
  overflow: hidden;
}
.page-about .about-hero-media {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .38;
}
.page-about .about-hero-veil {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(120% 80% at 80% 10%, rgba(53, 240, 208, .17), transparent 58%),
    radial-gradient(90% 70% at 8% 92%, rgba(255, 106, 43, .15), transparent 62%),
    linear-gradient(180deg, rgba(8, 32, 25, .5) 0%, rgba(8, 32, 25, .84) 54%, var(--ink) 100%);
}
.page-about .about-hero-inner {
  width: 100%;
}
.page-about .about-kicker {
  margin: 0 0 .8rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--cyan);
}
.page-about .about-title {
  margin: 0 0 1.1rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.6rem, 10.4vw, 6.2rem);
  line-height: .93;
  letter-spacing: -.015em;
  color: var(--white);
}
.page-about .about-lede {
  max-width: 60ch;
  margin: 0;
  font-size: clamp(.98rem, 2.2vw, 1.1rem);
  line-height: 1.85;
  color: #D8E7E1;
}
.page-about .about-hero-stats {
  list-style: none;
  margin: 2.1rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}
.page-about .about-hero-stats li {
  display: grid;
  gap: .2rem;
  padding: .95rem 1rem;
  background: rgba(11, 42, 37, .74);
}
.page-about .about-stat-num {
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3.4vw, 1.75rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan);
}
.page-about .about-stat-label {
  font-size: .78rem;
  line-height: 1.5;
  color: var(--mute);
}
.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: 1.9rem;
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  border-bottom: 1px solid var(--line-soft);
  background: rgba(8, 32, 25, .86);
}
.page-about .about-index-shell {
  display: flex;
  gap: .3rem;
  padding-top: .6rem;
  padding-bottom: .6rem;
  overflow-x: auto;
  scrollbar-width: none;
}
.page-about .about-index-shell::-webkit-scrollbar {
  display: none;
}
.page-about .about-index a {
  flex: 0 0 auto;
  padding: .45rem .75rem;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--mute);
  text-decoration: none;
  white-space: nowrap;
}
.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--cyan);
  border-color: var(--line);
}
.page-about .about-index a.is-active {
  color: var(--ink-deep);
  background: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 章节外壳 ---------- */
.page-about .about-chapter {
  position: relative;
  padding: var(--about-gap) 0;
  scroll-margin-top: 92px;
}
.page-about .about-chapter--violet { background: var(--about-violet); }
.page-about .about-chapter--dark { background: var(--ink); }
.page-about .about-chapter--layer { background: var(--ink-2); }
.page-about .about-chapter--deep { background: var(--ink-deep); }
.page-about .about-chapter .color-band {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  display: block;
  height: 12px;
}
.page-about .about-head {
  display: grid;
  gap: .55rem;
  max-width: 64ch;
  margin-bottom: clamp(1.9rem, 5vw, 3rem);
}
.page-about .about-head .section-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 6.4vw, 3.4rem);
  line-height: 1.03;
  letter-spacing: -.01em;
  color: var(--white);
}
.page-about .about-head .section-desc {
  margin: 0;
  font-size: .97rem;
  line-height: 1.85;
  color: var(--body-text);
}

/* ---------- 版本演进 ---------- */
.page-about .version-track {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.3rem;
}
.page-about .version-node {
  position: relative;
  display: grid;
  gap: .5rem;
  align-content: start;
  padding: 1.4rem 1.15rem 1.1rem;
  background: rgba(8, 32, 25, .46);
  border-top: 2px solid var(--line);
}
.page-about .version-dot {
  position: absolute;
  top: -7px;
  left: 1.15rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink-deep);
  border: 2px solid var(--cyan);
}
.page-about .version-node:nth-child(3) {
  border-top-color: rgba(255, 106, 43, .55);
}
.page-about .version-node:nth-child(3) .version-dot {
  background: var(--orange);
  border-color: var(--orange);
}
.page-about .version-tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--cyan);
}
.page-about .version-node:nth-child(3) .version-tag {
  color: var(--orange);
}
.page-about .version-name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.35rem;
  line-height: 1.2;
  color: var(--white);
}
.page-about .version-text {
  margin: 0;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--body-text);
}
.page-about .version-node .fold {
  margin-top: .35rem;
  padding-top: .6rem;
  border-top: 1px dashed var(--line-soft);
}
.page-about .version-node .fold summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--cyan);
}
.page-about .version-node .fold summary::-webkit-details-marker {
  display: none;
}
.page-about .version-node .fold summary::after {
  content: " ＋";
}
.page-about .version-node .fold[open] summary::after {
  content: " －";
}
.page-about .version-node .fold-body ul {
  margin: .65rem 0 0;
  padding-left: 1.05rem;
  display: grid;
  gap: .35rem;
  font-size: .87rem;
  line-height: 1.72;
  color: var(--mute);
}

/* ---------- 赛事覆盖 ---------- */
.page-about .coverage-grid {
  display: grid;
  gap: 2rem;
  align-items: center;
}
.page-about .coverage-figure {
  display: flex;
  justify-content: center;
}
.page-about .coverage-ring {
  width: min(100%, 320px);
  height: auto;
}
.page-about .ring-base {
  fill: none;
  stroke: rgba(242, 247, 245, .09);
  stroke-width: 16;
}
.page-about .ring-seg {
  fill: none;
  stroke-width: 16;
  stroke-linecap: butt;
}
.page-about .ring-seg--a { stroke: var(--cyan); }
.page-about .ring-seg--b { stroke: var(--orange); }
.page-about .ring-seg--c { stroke: var(--gold); }
.page-about .ring-total {
  fill: var(--white);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 46px;
  text-anchor: middle;
}
.page-about .ring-unit {
  fill: var(--mute);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-anchor: middle;
}
.page-about .ring-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.1rem;
}
.page-about .ring-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: .95rem;
  row-gap: .25rem;
  padding-left: .95rem;
  border-left: 3px solid var(--line);
}
.page-about .ring-item--cyan { border-left-color: var(--cyan); }
.page-about .ring-item--orange { border-left-color: var(--orange); }
.page-about .ring-item--gold { border-left-color: var(--gold); }
.page-about .ring-count {
  grid-row: 1 / span 2;
  align-self: center;
  font-family: var(--font-mono);
  font-size: 1.45rem;
  font-weight: 700;
  line-height: 1;
  color: var(--white);
}
.page-about .ring-name {
  grid-column: 2;
  margin: 0;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--white);
}
.page-about .ring-text {
  grid-column: 2;
  margin: 0;
  font-size: .88rem;
  line-height: 1.75;
  color: var(--mute);
}
.page-about .coverage-note {
  margin: 2.2rem 0 0;
  padding: 1rem 1.15rem;
  border-left: 3px solid var(--cyan);
  background: rgba(53, 240, 208, .06);
  font-size: .92rem;
  line-height: 1.85;
  color: var(--body-text);
}

/* ---------- 数据旅程 ---------- */
.page-about .journey-grid {
  display: grid;
  gap: 2rem;
}
.page-about .journey-steps {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .journey-step {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .4rem;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--line-soft);
}
.page-about .journey-step:first-child {
  border-top: 1px solid var(--line-soft);
}
.page-about .step-time {
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .1em;
  color: var(--orange);
}
.page-about .step-title {
  margin: 0 0 .3rem;
  font-size: 1.05rem;
  line-height: 1.4;
  color: var(--white);
}
.page-about .step-text {
  margin: 0;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--body-text);
}
.page-about .media-frame {
  margin: 0;
}
.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .media-caption {
  margin-top: .65rem;
  font-size: .79rem;
  line-height: 1.7;
  color: var(--mute);
}

/* ---------- 团队技能树 ---------- */
.page-about .team-tree {
  display: grid;
  justify-items: center;
  gap: 1.7rem;
}
.page-about .team-root {
  display: grid;
  gap: .15rem;
  padding: 1rem 2.2rem;
  text-align: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(53, 240, 208, .07);
}
.page-about .team-root-num {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 2.3rem;
  line-height: 1;
  color: var(--cyan);
}
.page-about .team-root-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--mute);
}
.page-about .team-branches {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
  width: 100%;
}
.page-about .team-branch {
  position: relative;
  display: grid;
  gap: .35rem;
  align-content: start;
  padding: 1.2rem 1.1rem;
  background: rgba(8, 32, 25, .5);
  border-top: 3px solid var(--line);
}
.page-about .team-branch--cyan { border-top-color: var(--cyan); }
.page-about .team-branch--orange { border-top-color: var(--orange); }
.page-about .team-branch--gold { border-top-color: var(--gold); }
.page-about .branch-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 700;
  line-height: 1;
  color: var(--white);
}
.page-about .branch-name {
  margin: 0;
  font-size: 1.02rem;
  color: var(--white);
}
.page-about .branch-text {
  margin: 0;
  font-size: .87rem;
  line-height: 1.78;
  color: var(--mute);
}
.page-about .about-partners {
  display: grid;
  gap: .65rem;
  max-width: 72ch;
  margin-top: 2.2rem;
}
.page-about .about-partners h3 {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--cyan);
}
.page-about .about-partners p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--body-text);
}

/* ---------- 跨设备同步 ---------- */
.page-about .sync-grid {
  display: grid;
  gap: 2rem;
}
.page-about .sync-points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .95rem;
}
.page-about .sync-points li {
  position: relative;
  padding-left: 1.4rem;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--body-text);
}
.page-about .sync-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .74em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
}
.page-about .sync-copy .btn {
  margin-top: 1.6rem;
}
.page-about .sync-media img {
  border: 1px solid var(--line-soft);
}

/* ---------- 行业认可 ---------- */
.page-about .honor-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.1rem;
}
.page-about .honor-item {
  display: grid;
  gap: .5rem;
  align-content: start;
  padding: 1.4rem 1.2rem;
  background: rgba(8, 32, 25, .48);
  border-bottom: 2px solid var(--line);
}
.page-about .honor-mark {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--gold);
}
.page-about .honor-item h3 {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.5;
  color: var(--white);
}
.page-about .honor-item p {
  margin: 0;
  font-size: .88rem;
  line-height: 1.78;
  color: var(--mute);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  padding: var(--about-gap) 0;
  background: var(--ink-deep);
  border-top: 1px solid var(--line);
}
.page-about .about-cta-inner {
  display: grid;
  gap: 1rem;
  max-width: 66ch;
}
.page-about .about-cta h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.75rem, 5vw, 2.8rem);
  line-height: 1.06;
  color: var(--white);
}
.page-about .about-cta p {
  margin: 0;
  font-size: .98rem;
  line-height: 1.85;
  color: var(--body-text);
}
.page-about .about-cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: .6rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .journey-step {
    grid-template-columns: 7.5rem minmax(0, 1fr);
    gap: 1.1rem;
  }
  .page-about .step-time {
    padding-top: .22rem;
  }
}

@media (min-width: 900px) {
  .page-about .version-track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.2rem;
  }
  .page-about .coverage-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 3rem;
  }
  .page-about .journey-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 3rem;
    align-items: start;
  }
  .page-about .sync-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 3rem;
    align-items: start;
  }
  .page-about .honor-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 800px) {
  .page-about .team-branches {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.2rem;
    padding-top: 1.7rem;
  }
  .page-about .team-branches::before {
    content: "";
    position: absolute;
    top: 0;
    left: 16.66%;
    right: 16.66%;
    height: 1px;
    background: var(--line);
  }
  .page-about .team-branches {
    position: relative;
  }
  .page-about .team-branch::before {
    content: "";
    position: absolute;
    top: -1.7rem;
    left: 50%;
    width: 1px;
    height: 1.7rem;
    background: var(--line);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index a,
  .page-about .ring-seg {
    transition: none;
  }
}
```