.page-about {
  --about-rail: 190px;
  --about-line: rgba(42, 58, 85, 0.75);
  overflow-x: clip;
}

.page-about .media-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-800);
}

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

.page-about .about-hero {
  padding-top: clamp(24px, 5vw, 52px);
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-style: italic;
  font-size: clamp(32px, 6.6vw, 68px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-hero__lead {
  max-width: 64ch;
  margin: 20px 0 0;
  color: var(--text-2);
  font-size: clamp(15px, 2.3vw, 18px);
  line-height: 1.78;
}

.page-about .about-kpis {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(26px, 4vw, 40px);
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-kpis__item {
  display: grid;
  gap: 4px;
  padding: 14px 16px;
  background: var(--ink-800);
}

.page-about .about-kpis .kpi__value {
  font-family: var(--font-mono);
  font-size: clamp(22px, 4.4vw, 34px);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--orange);
  line-height: 1;
}

.page-about .about-kpis__item:nth-child(2) .kpi__value { color: var(--cyan); }
.page-about .about-kpis__item:nth-child(3) .kpi__value { color: var(--lime); }
.page-about .about-kpis__item:nth-child(4) .kpi__value { color: var(--violet); }

.page-about .about-kpis .kpi__label {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--text-2);
}

.page-about .about-hero__figure {
  margin-top: clamp(26px, 4.5vw, 44px);
  aspect-ratio: 16 / 9;
  border-color: var(--line);
}

.page-about .about-hero__figure img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.page-about .media-frame__caption {
  margin: 10px 0 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--text-3);
  letter-spacing: 0.02em;
}

/* 长卷骨架 */
.page-about .about-shell {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  padding-top: clamp(38px, 6vw, 72px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .about-index__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-3);
}

.page-about .toc {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
}

.page-about .toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  flex: 0 0 auto;
  padding: 8px 12px;
  border-bottom: 2px solid var(--line);
  font-size: 13px;
  color: var(--text-2);
  white-space: nowrap;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

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

.page-about .toc__link[aria-current="true"] {
  color: var(--lime);
  border-color: var(--lime);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--text-3);
}

.page-about .toc__link[aria-current="true"] .about-index__num {
  color: var(--lime);
}

.page-about .about-flow {
  display: grid;
  gap: clamp(44px, 8vw, 96px);
  min-width: 0;
}

.page-about .about-chapter {
  scroll-margin-top: 90px;
  min-width: 0;
}

.page-about .about-chapter + .about-chapter::before {
  content: "";
  display: block;
  width: 68px;
  height: 7px;
  margin-bottom: clamp(24px, 4vw, 36px);
  background: linear-gradient(90deg, var(--orange), var(--violet));
  transform: skewX(-26deg);
}

.page-about .about-chapter__head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 18px;
}

.page-about .about-chapter__num {
  flex: 0 0 auto;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(34px, 6vw, 58px);
  line-height: 0.86;
  letter-spacing: -0.03em;
  color: transparent;
  -webkit-text-stroke: 1px var(--line);
  text-stroke: 1px var(--line);
}

.page-about .about-chapter__head h2 {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 4vw, 36px);
  line-height: 1.18;
  letter-spacing: -0.015em;
  color: var(--text);
}

.page-about .about-chapter__head .eyebrow {
  margin: 0;
}

.page-about .about-chapter__intro {
  margin: 0 0 clamp(20px, 3vw, 28px);
  max-width: 62ch;
  color: var(--text-2);
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.8;
}

.page-about .about-chapter .prose p {
  max-width: 68ch;
  color: var(--text-2);
  line-height: 1.85;
}

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

.page-about .about-chapter .prose a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-chapter .prose a:hover {
  border-color: var(--cyan);
}

/* 01 起点 */
.page-about .about-origin {
  display: grid;
  gap: 22px;
}

.page-about .about-pull {
  margin: 0;
  padding: 4px 0 4px 20px;
  border-left: 3px solid var(--orange);
  font-family: var(--font-serif);
  font-size: clamp(20px, 3.4vw, 30px);
  line-height: 1.5;
  color: var(--text);
}

/* 02 团队 */
.page-about .about-team {
  display: grid;
  gap: 24px;
}

.page-about .about-team__grid {
  display: grid;
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-team__item {
  background: var(--ink-700);
  border: 0;
  border-radius: 0;
  transition: background var(--dur) var(--ease);
}

.page-about .about-team__item summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-weight: 700;
  font-size: 15px;
  color: var(--text);
}

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

.page-about .about-team__item summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--cyan);
}

.page-about .about-team__item[open] summary::after {
  content: "−";
  color: var(--orange);
}

.page-about .about-team__item[open] {
  background: var(--ink-800);
  box-shadow: inset 3px 0 0 0 var(--orange);
}

.page-about .about-team__item p {
  margin: 0;
  padding: 0 16px 18px 16px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-2);
}

.page-about .about-team__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  border: 1px solid var(--line);
  padding: 2px 6px;
}

.page-about .about-team__figure {
  aspect-ratio: 3 / 2;
}

.page-about .about-team__figure img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

/* 03 战报 */
.page-about .about-lines {
  display: grid;
  gap: 1px;
  margin-bottom: clamp(22px, 3.4vw, 30px);
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-lines__row {
  display: grid;
  gap: 8px;
  padding: 16px;
  background: var(--ink-800);
  transition: background var(--dur) var(--ease);
}

.page-about .about-lines__row:hover {
  background: var(--ink-700);
}

.page-about .about-lines__row p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-2);
}

.page-about .about-lines__row .tag {
  justify-self: start;
}

/* 04 版本 */
.page-about .about-tl {
  list-style: none;
  margin: 0 0 clamp(24px, 4vw, 34px);
  padding: 0;
}

.page-about .about-tl__item {
  position: relative;
  display: grid;
  gap: 5px;
  padding: 18px 0;
  border-top: 1px solid var(--about-line);
  transition: border-color var(--dur) var(--ease);
}

.page-about .about-tl__item:last-child {
  border-bottom: 1px solid var(--about-line);
}

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

.page-about .about-tl__year {
  font-family: var(--font-mono);
  font-size: clamp(20px, 3.6vw, 28px);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--cyan);
  line-height: 1;
}

.page-about .about-tl__name {
  font-weight: 700;
  font-size: clamp(16px, 2.2vw, 19px);
  color: var(--text);
}

.page-about .about-tl__pop {
  display: block;
  padding: 10px 14px;
  border-left: 2px solid var(--orange);
  background: var(--ink-800);
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-2);
}

.page-about .about-version__figure {
  aspect-ratio: 3 / 2;
}

.page-about .about-version__figure img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

/* 05 合作 */
.page-about .about-partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-leg {
  display: grid;
  gap: 8px;
  padding: 18px 16px;
  background: var(--ink-800);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-leg:hover {
  background: var(--ink-700);
  box-shadow: inset 0 0 0 1px var(--cyan);
}

.page-about .about-leg .tag {
  justify-self: start;
}

.page-about .about-leg__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(22px, 4vw, 30px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
  color: var(--text);
}

.page-about .about-leg p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-2);
}

/* 06 规模 */
.page-about .about-scale {
  display: grid;
  gap: 26px;
}

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

.page-about .about-ticks__row {
  display: grid;
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  font-size: 13px;
  color: var(--text-2);
}

.page-about .about-ticks__k {
  font-family: var(--font-mono);
  font-size: clamp(15px, 2.4vw, 18px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--lime);
}

/* 07 联系 */
.page-about .about-contact {
  display: grid;
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-contact__row {
  display: grid;
  gap: 8px;
  padding: 16px;
  background: var(--ink-800);
}

.page-about .about-contact__row .tag {
  justify-self: start;
}

.page-about .about-contact__row p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-2);
}

.page-about .about-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .about-contact__note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  font-size: 12px;
  line-height: 1.8;
  color: var(--text-3);
  word-break: break-word;
}

@media (min-width: 720px) {
  .page-about .about-kpis {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-lines__row {
    grid-template-columns: 110px minmax(0, 1fr);
    align-items: start;
    gap: 14px;
  }

  .page-about .about-ticks__row {
    grid-template-columns: 130px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }
}

@media (min-width: 900px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(40px, 6vw, 72px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 28px;
    align-self: start;
  }

  .page-about .toc {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .toc__link {
    justify-content: flex-start;
    width: 100%;
    padding: 9px 12px;
    border-bottom: 0;
    border-left: 2px solid transparent;
    margin-left: -1px;
  }

  .page-about .about-origin {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: clamp(24px, 4vw, 44px);
    align-items: start;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 40px);
    align-items: start;
  }

  .page-about .about-scale {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: clamp(26px, 4vw, 48px);
    align-items: start;
  }

  .page-about .about-tl__pop {
    position: absolute;
    top: calc(100% - 6px);
    left: 0;
    z-index: 3;
    width: min(440px, 100%);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    box-shadow: 0 18px 40px rgba(7, 11, 20, 0.75);
    transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility var(--dur);
  }

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

  .page-about .about-tl__item:last-child .about-tl__pop {
    top: auto;
    bottom: calc(100% - 6px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .toc__link,
  .page-about .about-tl__pop,
  .page-about .about-tl__item,
  .page-about .about-leg,
  .page-about .about-lines__row,
  .page-about .about-team__item {
    transition: none;
  }
}
<<<END>>>