.page-about {
  --about-cut: 22px;
  --about-glow: rgba(56, 242, 208, 0.16);
  background: var(--ink);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: clip;
  padding-block: clamp(18px, 2.6vw, 30px) clamp(36px, 5.5vw, 72px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -32%;
  right: -16%;
  width: min(620px, 74vw);
  aspect-ratio: 1 / 1;
  background: radial-gradient(circle at 34% 34%, var(--about-glow), transparent 64%);
  clip-path: polygon(22% 0, 100% 0, 100% 74%, 76% 100%, 0 100%, 0 22%);
  pointer-events: none;
  z-index: -1;
}

.page-about .hero-grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  margin-top: clamp(20px, 3.6vw, 38px);
}

.page-about .hero-lead h1 {
  margin: clamp(10px, 1.6vw, 16px) 0 0;
  font-family: var(--font-display);
  font-size: clamp(38px, 8.2vw, 100px);
  line-height: 0.96;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--warm);
}

.page-about .hero-lede {
  max-width: 47ch;
  margin-top: clamp(16px, 2.6vw, 26px);
  color: var(--haze);
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .hero-side {
  padding: clamp(18px, 3vw, 28px);
  background: linear-gradient(158deg, var(--panel), var(--ink) 76%);
  border: 1px solid rgba(56, 242, 208, 0.22);
  box-shadow: inset 0 0 0 1px rgba(11, 43, 36, 0.9);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .hero-side__label {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .facts {
  margin: clamp(10px, 1.8vw, 16px) 0 0;
}

.page-about .facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding-block: 9px;
  border-bottom: var(--line);
}

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

.page-about .facts dt {
  font-size: 13px;
  color: var(--haze);
}

.page-about .facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(16px, 2.4vw, 21px);
  line-height: 1.2;
  color: var(--warm);
  text-align: right;
}

/* ---------- 章节骨架 ---------- */

.page-about .chapter {
  border-top: 1px solid rgba(35, 58, 50, 0.95);
  padding-block: var(--pad-y);
}

.page-about .chapter__inner {
  display: grid;
  gap: clamp(16px, 2.6vw, 30px);
}

.page-about .chapter__rail {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-left: 14px;
  border-left: 2px solid var(--moss);
}

.page-about .chapter__year {
  font-family: var(--font-mono);
  font-size: clamp(15px, 2vw, 19px);
  line-height: 1.2;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .chapter__kicker {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--haze);
}

.page-about .chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(27px, 4.2vw, 52px);
  line-height: 1.06;
  font-weight: 700;
  color: var(--warm);
}

.page-about .chapter__lede {
  margin-top: clamp(12px, 1.8vw, 18px);
  max-width: 58ch;
  color: var(--haze);
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
}

.page-about .chapter__text {
  margin-top: clamp(16px, 2.4vw, 24px);
  max-width: 68ch;
}

.page-about .chapter__text p {
  color: var(--haze);
  font-size: 15.5px;
  line-height: 1.88;
}

.page-about .chapter__text p + p {
  margin-top: 14px;
}

.page-about .chapter__body .figure-frame {
  margin-top: clamp(22px, 3.4vw, 36px);
}

/* ---------- 观赛主张 ---------- */

.page-about .creeds {
  display: grid;
  gap: clamp(14px, 2vw, 20px);
  margin-top: clamp(24px, 3.6vw, 38px);
}

.page-about .creed {
  padding: clamp(16px, 2.4vw, 24px) clamp(16px, 2.4vw, 26px);
  border-left: 1px solid var(--moss);
  transition: border-color 200ms var(--ease), background-color 200ms var(--ease);
}

.page-about .creed:hover,
.page-about .creed:focus-within {
  border-left-color: var(--cyan);
  background-color: rgba(11, 43, 36, 0.6);
}

.page-about .creed__tag {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--clay);
}

.page-about .creed__quote {
  margin-top: 8px;
  font-family: var(--font-display);
  font-size: clamp(21px, 2.9vw, 31px);
  line-height: 1.18;
  font-weight: 700;
  color: var(--warm);
}

.page-about .creed__body {
  margin-top: 12px;
  max-width: 60ch;
  color: var(--haze);
  font-size: 15px;
  line-height: 1.85;
}

/* ---------- 四段流程 ---------- */

.page-about .flow {
  display: grid;
  gap: 1px;
  margin: clamp(24px, 3.6vw, 36px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--moss);
  border: 1px solid rgba(35, 58, 50, 0.95);
}

.page-about .flow__step {
  padding: clamp(16px, 2.4vw, 24px);
  background: var(--ink);
}

.page-about .flow__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .flow__name {
  margin-top: 8px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--warm);
}

.page-about .flow__text {
  margin-top: 8px;
  color: var(--haze);
  font-size: 14px;
  line-height: 1.78;
}

/* ---------- 版本时间轴 ---------- */

.page-about .timeline {
  position: relative;
  margin: clamp(24px, 3.6vw, 40px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 16px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(56, 242, 208, 0.05));
}

.page-about .milestone {
  position: relative;
  padding: 0 0 clamp(24px, 3.4vw, 34px) clamp(24px, 3.6vw, 38px);
}

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

.page-about .milestone::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 11px;
  height: 11px;
  background: var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% 66%, 66% 100%, 0 100%);
}

.page-about .milestone--current::before {
  background: var(--orange);
}

.page-about .milestone__year {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .milestone--current .milestone__year {
  color: var(--orange);
}

.page-about .milestone__title {
  margin-top: 5px;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.6vw, 27px);
  line-height: 1.22;
  font-weight: 700;
  color: var(--warm);
}

.page-about .milestone__text {
  margin-top: 8px;
  max-width: 64ch;
  color: var(--haze);
  font-size: 15px;
  line-height: 1.82;
}

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

.page-about .milestone__more summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  list-style: none;
  cursor: pointer;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--cyan);
  transition: color 180ms var(--ease);
}

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

.page-about .milestone__more summary::before {
  content: "+";
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--orange);
}

.page-about .milestone__more[open] summary::before {
  content: "–";
}

.page-about .milestone__more summary:hover {
  color: var(--warm);
}

.page-about .milestone__more p {
  margin-top: 10px;
  padding-left: 16px;
  border-left: 1px solid var(--moss);
  max-width: 60ch;
  color: var(--haze);
  font-size: 14px;
  line-height: 1.82;
}

/* ---------- 团队网络 ---------- */

.page-about .network {
  display: grid;
  gap: 1px;
  margin-top: clamp(22px, 3.2vw, 32px);
  background: var(--moss);
  border: 1px solid rgba(35, 58, 50, 0.95);
}

.page-about .network__node {
  padding: clamp(16px, 2.4vw, 24px);
  background: var(--ink);
}

.page-about .network__name {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .network__num {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.4vw, 38px);
  line-height: 1;
  color: var(--warm);
}

.page-about .network__desc {
  margin-top: 10px;
  color: var(--haze);
  font-size: 14px;
  line-height: 1.78;
}

.page-about .team-note {
  margin-top: clamp(16px, 2.4vw, 22px);
  padding-left: 14px;
  border-left: 2px solid var(--clay);
  max-width: 62ch;
  color: var(--haze);
  font-size: 14.5px;
  line-height: 1.82;
}

/* ---------- 覆盖范围 ---------- */

.page-about .coverage {
  display: grid;
  gap: clamp(24px, 3.6vw, 40px);
  margin-top: clamp(22px, 3.2vw, 32px);
}

.page-about .coverage__list {
  display: grid;
  gap: clamp(16px, 2.4vw, 22px);
}

.page-about .coverage__item {
  padding-bottom: clamp(14px, 2vw, 18px);
  border-bottom: var(--line);
}

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

.page-about .coverage__num {
  font-family: var(--font-mono);
  font-size: clamp(38px, 6vw, 56px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .coverage__label {
  margin-top: 8px;
  max-width: 30ch;
  color: var(--haze);
  font-size: 14px;
  line-height: 1.75;
}

/* ---------- 纠错机制 ---------- */

.page-about .quality {
  margin: clamp(22px, 3.2vw, 32px) 0 0;
}

.page-about .quality__row {
  display: grid;
  gap: 8px;
  padding-block: clamp(14px, 2vw, 18px);
  border-top: var(--line);
}

.page-about .quality__row:last-child {
  border-bottom: var(--line);
}

.page-about .quality__row dt {
  font-family: var(--font-display);
  font-size: clamp(17px, 2.2vw, 21px);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--warm);
}

.page-about .quality__row dd {
  margin: 0;
  max-width: 64ch;
  color: var(--haze);
  font-size: 14.5px;
  line-height: 1.82;
}

.page-about .quality__note {
  margin-top: clamp(16px, 2.4vw, 22px);
  color: var(--haze);
  font-size: 14px;
  line-height: 1.8;
}

.page-about .quality__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(56, 242, 208, 0.4);
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

.page-about .quality__note a:hover {
  color: var(--warm);
  border-bottom-color: var(--orange);
}

/* ---------- 收尾 ---------- */

.page-about .chapter--close {
  background: linear-gradient(180deg, rgba(11, 43, 36, 0.55), rgba(2, 16, 13, 0.9));
}

.page-about .close-links {
  display: grid;
  gap: 1px;
  margin-top: clamp(24px, 3.6vw, 36px);
  background: var(--moss);
  border: 1px solid rgba(35, 58, 50, 0.95);
}

.page-about .close-link {
  display: block;
  padding: clamp(16px, 2.4vw, 22px);
  background: var(--ink);
  text-decoration: none;
  transition: background-color 190ms var(--ease), transform 190ms var(--ease);
}

.page-about .close-link:hover,
.page-about .close-link:focus-visible {
  background-color: var(--panel);
  transform: translateX(2px);
}

.page-about .close-link__label {
  display: block;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--cyan);
}

.page-about .close-link__text {
  display: block;
  margin-top: 6px;
  color: var(--haze);
  font-size: 13.5px;
  line-height: 1.7;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .creeds {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .creeds .creed:first-child {
    grid-column: 1 / -1;
  }

  .page-about .close-links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

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

  .page-about .flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .quality__row {
    grid-template-columns: minmax(0, 240px) minmax(0, 1fr);
    align-items: baseline;
    gap: clamp(16px, 3vw, 36px);
  }
}

@media (min-width: 900px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .chapter__inner {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .chapter__rail {
    position: sticky;
    top: calc(var(--head-h) + 24px);
    align-self: start;
    border-left-color: var(--cyan);
  }

  .page-about .creeds {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .creeds .creed:first-child {
    grid-column: auto;
  }

  .page-about .coverage {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.82fr);
    align-items: center;
  }
}

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

@media (prefers-reduced-motion: reduce) {
  .page-about .creed,
  .page-about .close-link,
  .page-about .milestone__more summary,
  .page-about .quality__note a {
    transition: none;
  }

  .page-about .close-link:hover,
  .page-about .close-link:focus-visible {
    transform: none;
  }
}
<<<END>>>