.page-about {
  --about-edge: 20px;
  --rail-w: 40px;
  background: var(--ink);
  color: var(--moss);
  font-family: var(--font-sans);
  overflow-x: clip;
}

@media (min-width: 720px) {
  .page-about {
    --about-edge: 40px;
    --rail-w: 64px;
  }
}

@media (min-width: 1080px) {
  .page-about {
    --about-edge: 72px;
    --rail-w: 96px;
  }
}

.page-about .about-wrap {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--about-edge);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding-block: 40px 0;
  background:
    radial-gradient(88% 62% at 80% 0%, rgba(53, 231, 198, 0.13), transparent 62%),
    radial-gradient(72% 54% at 6% 96%, rgba(28, 107, 94, 0.3), transparent 70%),
    var(--ink);
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 40px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--concrete);
}

.page-about .breadcrumb__link {
  color: var(--concrete);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .breadcrumb__current {
  color: var(--white);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 44px;
  padding-bottom: 56px;
}

@media (min-width: 1024px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 56px;
    align-items: end;
  }
}

.page-about .eyebrow {
  margin: 0 0 20px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--concrete);
}

.page-about .display-title {
  margin: 0 0 26px;
  font-family: var(--font-display);
  font-size: clamp(38px, 9vw, 74px);
  font-weight: 700;
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .display-title em {
  display: block;
  font-style: normal;
  color: var(--cyan);
}

.page-about .lede {
  max-width: 40em;
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--moss);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.page-about .about-hero__panel {
  position: relative;
  padding: 24px 22px 26px;
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: var(--cut);
}

.page-about .about-hero__panel-title {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--concrete);
}

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

.page-about .about-stats__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 12px;
  padding: 12px 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-stats dt {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--concrete);
}

.page-about .about-stats dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.page-about .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.page-about .num--xl {
  font-size: clamp(24px, 5vw, 34px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .num--signal {
  color: var(--signal);
}

.page-about .about-stats__u {
  font-size: 12px;
  color: var(--concrete);
}

.page-about .about-pulse {
  height: 2px;
  background: linear-gradient(90deg, transparent 0%, var(--cyan) 26%, var(--mid) 54%, var(--cyan) 78%, transparent 100%);
  opacity: 0.6;
}

/* ---------- 章节骨架 ---------- */

.page-about .about-flow {
  padding-bottom: 24px;
}

.page-about .chapter {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--rail-w);
  column-gap: 12px;
  padding-block: 52px 58px;
  border-top: 1px solid var(--line);
  scroll-margin-top: 140px;
}

@media (min-width: 1024px) {
  .page-about .chapter {
    column-gap: 32px;
    padding-block: 76px 84px;
  }
}

.page-about .chapter::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  right: calc(var(--rail-w) / 2);
  width: 1px;
  background: var(--line);
  pointer-events: none;
}

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

.page-about .chapter__rail {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding-top: 2px;
}

.page-about .chapter__node {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  background: var(--ink);
  border: 1px solid var(--line);
  transform: rotate(45deg);
  text-decoration: none;
  transition: background 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .chapter__node > span {
  display: none;
  transform: rotate(-45deg);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.04em;
  color: var(--concrete);
}

@media (min-width: 1024px) {
  .page-about .chapter__node {
    width: 38px;
    height: 38px;
  }

  .page-about .chapter__node > span {
    display: block;
  }
}

.page-about .chapter__node:hover,
.page-about .chapter__node:focus-visible {
  border-color: var(--cyan);
  background: var(--mid);
  outline: none;
}

.page-about .chapter__node:hover > span,
.page-about .chapter__node:focus-visible > span {
  color: var(--white);
}

.page-about .chapter:target .chapter__node {
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .chapter:target .chapter__node > span {
  color: var(--ink);
}

.page-about .about-h2 {
  margin: 0 0 22px;
  font-family: var(--font-display);
  font-size: clamp(26px, 5.2vw, 44px);
  font-weight: 700;
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--white);
}

@media (min-width: 1024px) {
  .page-about .about-h2 {
    margin-bottom: 26px;
  }
}

.page-about .prose {
  max-width: 38em;
}

.page-about .prose p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--moss);
}

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

/* ---------- 图框 ---------- */

.page-about .about-fig {
  position: relative;
  margin: 34px 0 0;
  border: 1px solid var(--line);
  background: var(--ink-2);
  clip-path: var(--cut-tr);
  overflow: hidden;
}

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

.page-about .about-fig figcaption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 7px 14px;
  background: rgba(5, 16, 12, 0.86);
  border-top: 1px solid var(--line);
  border-right: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--concrete);
}

/* ---------- 团队比例条 ---------- */

.page-about .roles {
  margin-top: 32px;
  border-top: 1px solid var(--line);
}

.page-about .role {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px 16px;
  align-items: baseline;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  outline: none;
}

.page-about .role__label {
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--white);
}

.page-about .role__v {
  justify-self: end;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 20px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .role__track {
  grid-column: 1 / -1;
  display: block;
  height: 5px;
  background: var(--ink-2);
  border-left: 1px solid var(--line);
  overflow: hidden;
}

.page-about .role__fill {
  display: block;
  height: 100%;
  width: var(--w, 0%);
  background: linear-gradient(90deg, var(--mid) 0%, var(--cyan) 100%);
  transition: background 0.2s var(--ease);
}

.page-about .role:hover .role__fill,
.page-about .role:focus .role__fill,
.page-about .role:focus-within .role__fill {
  background: linear-gradient(90deg, var(--cyan) 0%, var(--white) 100%);
}

.page-about .role__note {
  position: absolute;
  z-index: 4;
  left: 0;
  top: calc(100% - 8px);
  max-width: 320px;
  padding: 10px 14px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--white);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity 0.18s var(--ease), transform 0.18s var(--ease), visibility 0.18s;
  pointer-events: none;
}

.page-about .role:hover .role__note,
.page-about .role:focus .role__note,
.page-about .role:focus-within .role__note {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* ---------- 比赛日流程 ---------- */

.page-about .flow {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

@media (min-width: 700px) {
  .page-about .flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 1080px) {
  .page-about .flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 24px;
  }
}

.page-about .flow__step {
  position: relative;
  padding: 18px 16px 20px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  clip-path: var(--cut-sm);
}

@media (min-width: 1080px) {
  .page-about .flow__step::after {
    content: "";
    position: absolute;
    top: 30px;
    left: 100%;
    width: 24px;
    height: 1px;
    background: var(--line);
    transform: rotate(-9deg);
    transform-origin: left center;
  }

  .page-about .flow__step:last-child::after {
    content: none;
  }
}

.page-about .flow__idx {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .flow__step h3 {
  margin: 0 0 10px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--white);
}

.page-about .flow__step p {
  margin: 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--moss);
}

/* ---------- 大数字引述 ---------- */

.page-about .about-quote {
  margin: 36px 0 0;
  padding: 26px 22px;
  border-left: 2px solid var(--signal);
  background: linear-gradient(90deg, rgba(255, 123, 51, 0.09), transparent 72%);
}

.page-about .about-quote__num {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(46px, 11vw, 86px);
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--signal);
}

.page-about .about-quote__num span {
  font-size: 0.5em;
  vertical-align: top;
  color: var(--concrete);
}

.page-about .about-quote figcaption {
  font-size: 14px;
  line-height: 1.72;
  color: var(--moss);
}

/* ---------- 版本号 ---------- */

.page-about .ver {
  margin-top: 30px;
}

.page-about .ver__chip {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: var(--cut-sm);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--white);
  cursor: pointer;
  list-style: none;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .ver__chip::-webkit-details-marker {
  display: none;
}

.page-about .ver__chip:hover,
.page-about .ver__chip:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
  outline: none;
}

.page-about .ver__dot {
  width: 7px;
  height: 7px;
  flex: none;
  border-radius: 50%;
  background: var(--signal);
  animation: aboutPulse 4.2s var(--ease) infinite;
}

.page-about .ver[open] .ver__chip {
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-about .ver__list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .ver__list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.72;
  color: var(--moss);
}

@media (min-width: 700px) {
  .page-about .ver__list li {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }
}

.page-about .ver__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

@keyframes aboutPulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.42; transform: scale(0.82); }
}

/* ---------- 下一步 ---------- */

.page-about .about-next {
  margin-top: 8px;
  padding-block: 56px 72px;
  background:
    radial-gradient(80% 70% at 50% 0%, rgba(28, 107, 94, 0.28), transparent 68%),
    var(--ink-2);
  border-top: 1px solid var(--line);
}

.page-about .about-next__links {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

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

@media (min-width: 1080px) {
  .page-about .about-next__links {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }
}

.page-about .about-next__links a {
  display: block;
  height: 100%;
  padding: 20px 18px 22px;
  background: var(--ink);
  border: 1px solid var(--line);
  clip-path: var(--cut-sm);
  text-decoration: none;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-next__links a:hover,
.page-about .about-next__links a:focus-visible {
  border-color: var(--cyan);
  background: var(--panel);
  outline: none;
}

.page-about .about-next__label {
  display: block;
  margin-bottom: 8px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--white);
}

.page-about .about-next__links a:hover .about-next__label,
.page-about .about-next__links a:focus-visible .about-next__label {
  color: var(--cyan);
}

.page-about .about-next__desc {
  display: block;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--concrete);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ver__dot {
    animation: none;
  }

  .page-about .role__note,
  .page-about .chapter__node,
  .page-about .role__fill {
    transition: none;
  }
}
<<<END>>>

.page-about {
  --w: 1rem;
}