.page-about {
  --ab-rule: 1px solid var(--grid);
  --ab-gap: clamp(22px, 3.4vw, 46px);
  background: var(--ink-950);
  color: var(--paper);
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  letter-spacing: -0.02em;
  margin: 0;
}

.page-about p {
  margin: 0;
}

/* 面包屑 */
.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 20px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--grid);
}

.page-about .breadcrumb li[aria-current="page"] {
  color: var(--lime);
}

/* 首屏 */
.page-about .about-hero {
  padding: clamp(22px, 3.6vw, 44px) 0 clamp(34px, 5vw, 68px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 56px);
}

.page-about .about-hero h1 {
  font-size: clamp(38px, 7.4vw, 84px);
  font-weight: 700;
  line-height: 0.96;
  margin: 14px 0 18px;
  max-width: 14ch;
}

.page-about .about-hero .lead {
  max-width: 54ch;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.page-about .about-figs {
  list-style: none;
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--grid);
  border-top: var(--ab-rule);
  border-bottom: var(--ab-rule);
}

.page-about .about-figs li {
  background: var(--ink-950);
  padding: 14px 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-figs b {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(19px, 2.4vw, 27px);
  color: var(--lime);
  letter-spacing: -0.01em;
}

.page-about .about-figs span {
  font-size: 12px;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .about-hero__media {
  margin: 0;
  aspect-ratio: 4 / 5;
  border: 1px solid var(--grid);
  background: var(--ink-800);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 48px), calc(100% - 48px) 100%, 0 100%);
  overflow: hidden;
}

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

/* 起点章节 */
.page-about .about-origin__grid {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .about-rail {
  display: flex;
  gap: 22px;
  padding-top: 14px;
  border-top: var(--ab-rule);
  overflow-x: auto;
}

.page-about .about-rail__item {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: clamp(17px, 2vw, 21px);
  color: var(--lime);
  letter-spacing: 0.02em;
}

.page-about .about-rail__cap {
  font-size: 12px;
  color: var(--mist);
  letter-spacing: 0.04em;
}

.page-about .about-body h2 {
  font-size: clamp(27px, 3.8vw, 46px);
  font-weight: 700;
  line-height: 1.05;
  margin-bottom: 18px;
  max-width: 18ch;
}

.page-about .about-body p {
  max-width: 62ch;
  line-height: 1.75;
  color: var(--mist);
}

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

.page-about .about-callout {
  margin-top: 26px;
  padding: 18px 18px 20px;
  border-left: 2px solid var(--lime);
  background: linear-gradient(100deg, var(--ink-800), var(--ink-950) 88%);
  display: grid;
  gap: 8px;
}

.page-about .about-callout__key {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--lime);
  text-transform: uppercase;
}

.page-about .about-callout p {
  max-width: 56ch;
  color: var(--paper);
}

/* 流程 */
.page-about .section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 16px;
  border-bottom: var(--ab-rule);
  margin-bottom: clamp(22px, 3vw, 38px);
}

.page-about .section-head h2 {
  font-size: clamp(26px, 3.6vw, 44px);
  font-weight: 700;
  line-height: 1.06;
  margin-top: 10px;
  max-width: 22ch;
}

.page-about .section-head__note {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .about-flow__grid {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}

.page-about .about-flow__media {
  margin: 0;
  aspect-ratio: 10 / 7;
  border: 1px solid var(--grid);
  background: var(--ink-800);
  overflow: hidden;
}

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

.page-about .flow-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .flow-step {
  background: var(--ink-900);
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 4px 12px;
  padding: clamp(16px, 2.2vw, 24px);
  transition: background var(--dur) var(--ease);
}

.page-about .flow-step:hover {
  background: var(--ink-800);
}

.page-about .flow-step__no {
  grid-row: 1 / span 2;
  font-size: 14px;
  color: var(--lime);
  padding-top: 3px;
}

.page-about .flow-step h3 {
  font-size: clamp(19px, 2.2vw, 24px);
  font-weight: 600;
}

.page-about .flow-step p {
  font-size: 15px;
  line-height: 1.72;
  color: var(--mist);
}

/* 团队 */
.page-about .about-team__grid {
  display: grid;
  gap: clamp(24px, 3.4vw, 40px);
}

.page-about .team-total {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  padding-top: 16px;
  border-top: var(--ab-rule);
}

.page-about .team-total b {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(56px, 11vw, 104px);
  line-height: 0.82;
  color: var(--lime);
}

.page-about .team-total__label {
  display: block;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
  margin-bottom: 8px;
}

.page-about .team-total p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
  max-width: 34ch;
}

.page-about .team-rows {
  border-top: var(--ab-rule);
}

.page-about .team-row {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--grid);
  transition: border-color var(--dur) var(--ease);
}

.page-about .team-row:hover,
.page-about .team-row:focus-within {
  border-bottom-color: var(--lime);
}

.page-about .team-row__num {
  font-size: 15px;
  color: var(--lime);
}

.page-about .team-row__role {
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 600;
}

.page-about .team-row__desc {
  font-size: 15px;
  line-height: 1.72;
  color: var(--mist);
  opacity: 0.86;
  transition: opacity var(--dur) var(--ease);
}

.page-about .team-row:hover .team-row__desc {
  opacity: 1;
}

.page-about .about-team__media {
  margin: 0;
  aspect-ratio: 10 / 7;
  border: 1px solid var(--grid);
  background: var(--ink-800);
  overflow: hidden;
}

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

/* 发展节点 */
.page-about .era {
  position: relative;
  display: grid;
  gap: clamp(18px, 2.6vw, 32px);
}

.page-about .era-input {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  clip-path: inset(50%);
  overflow: hidden;
  white-space: nowrap;
}

.page-about .era-ticks {
  display: flex;
  overflow-x: auto;
  border-top: var(--ab-rule);
  padding-top: 8px;
  scrollbar-width: thin;
}

.page-about .era-tick {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 10px 18px 10px 0;
  border-top: 2px solid transparent;
  border-color: transparent;
  color: var(--mist);
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .era-tick:hover {
  color: var(--lime-soft);
}

.page-about .era-tick__year {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.06em;
}

.page-about .era-tick__cap {
  font-size: 11px;
  letter-spacing: 0.06em;
}

.page-about .era-input:focus-visible ~ .era-ticks {
  outline: 1px solid var(--lime);
  outline-offset: 6px;
}

.page-about #era-2014:checked ~ .era-ticks .era-tick[for="era-2014"],
.page-about #era-2017:checked ~ .era-ticks .era-tick[for="era-2017"],
.page-about #era-2020:checked ~ .era-ticks .era-tick[for="era-2020"],
.page-about #era-2023:checked ~ .era-ticks .era-tick[for="era-2023"],
.page-about #era-2025:checked ~ .era-ticks .era-tick[for="era-2025"] {
  color: var(--lime);
  border-color: var(--lime);
}

.page-about .era-panel {
  display: none;
  border: 1px solid var(--grid);
  background: linear-gradient(155deg, var(--ink-800), var(--ink-950) 78%);
  padding: clamp(20px, 3vw, 34px);
}

.page-about #era-2014:checked ~ .era-panels #era-panel-2014,
.page-about #era-2017:checked ~ .era-panels #era-panel-2017,
.page-about #era-2020:checked ~ .era-panels #era-panel-2020,
.page-about #era-2023:checked ~ .era-panels #era-panel-2023,
.page-about #era-2025:checked ~ .era-panels #era-panel-2025 {
  display: block;
}

.page-about .era-panel h3 {
  font-size: clamp(21px, 2.6vw, 30px);
  font-weight: 700;
  line-height: 1.12;
  margin-bottom: 12px;
  max-width: 24ch;
}

.page-about .era-panel p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
  max-width: 58ch;
}

.page-about .era-panel__meta {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--grid);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--lime);
}

/* 覆盖 */
.page-about .cover-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .cover-tile {
  background: var(--ink-950);
  padding: clamp(18px, 2.4vw, 26px);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: background var(--dur) var(--ease);
}

.page-about .cover-tile:hover {
  background: var(--ink-800);
}

.page-about .cover-tile__num {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-about .cover-tile h3 {
  font-size: clamp(18px, 2.1vw, 23px);
  font-weight: 600;
}

.page-about .cover-tile p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .cover-strip {
  margin-top: clamp(22px, 3vw, 34px);
  display: grid;
  gap: 16px;
}

.page-about .cover-strip__bar {
  height: 24px;
  border-bottom: 1px solid var(--grid);
  background-image: repeating-linear-gradient(90deg, var(--grid) 0 1px, transparent 1px 13px);
}

.page-about .cover-strip__facts {
  display: grid;
  gap: 10px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .cover-strip__facts b {
  display: inline-block;
  margin-right: 6px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .cover-strip__more {
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .cover-strip__more a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid var(--grid);
  transition: border-color var(--dur-fast) var(--ease);
}

.page-about .cover-strip__more a:hover,
.page-about .cover-strip__more a:focus-visible {
  border-bottom-color: var(--lime);
}

/* 质量与资质 */
.page-about .quality-grid {
  margin: 0;
  display: grid;
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .quality-item {
  background: var(--ink-900);
  padding: clamp(16px, 2.2vw, 24px);
  display: grid;
  gap: 8px;
  align-content: start;
}

.page-about .quality-item__code {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--mint);
}

.page-about .quality-item__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* 收尾行动 */
.page-about .about-cta {
  margin-top: clamp(32px, 5vw, 64px);
  padding: clamp(30px, 4.4vw, 58px) 0;
  background: var(--ink-900);
  border-top: 1px solid var(--grid);
  border-bottom: 1px solid var(--grid);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 22px;
}

.page-about .about-cta h2 {
  font-size: clamp(26px, 3.6vw, 44px);
  font-weight: 700;
  line-height: 1.05;
  margin-bottom: 10px;
}

.page-about .about-cta p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist);
  max-width: 46ch;
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* 断点 */
@media (min-width: 620px) {
  .page-about .about-figs {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .cover-strip__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: start;
  }

  .page-about .about-hero__media {
    aspect-ratio: 5 / 6;
  }

  .page-about .about-origin__grid {
    grid-template-columns: 156px minmax(0, 1fr);
    gap: clamp(30px, 4vw, 66px);
  }

  .page-about .about-rail {
    flex-direction: column;
    gap: 26px;
    overflow: visible;
  }

  .page-about .about-flow__grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    align-items: start;
  }

  .page-about .about-flow__media {
    aspect-ratio: 4 / 5;
  }

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

  .page-about .team-total {
    grid-column: 1 / -1;
  }

  .page-about .team-row {
    grid-template-columns: 76px minmax(0, 0.9fr) minmax(0, 1.6fr);
    align-items: baseline;
    gap: 0 20px;
  }

  .page-about .about-team__media {
    aspect-ratio: 4 / 3;
  }

  .page-about .era {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: clamp(24px, 3vw, 44px);
  }

  .page-about .era-ticks {
    flex-direction: column;
    overflow: visible;
    border-top: 0;
    padding-top: 0;
  }

  .page-about .era-tick {
    padding: 12px 0 12px 16px;
    border-top: 0;
    border-left: 2px solid transparent;
  }

  .page-about .cover-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 32px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero h1 {
    max-width: 12ch;
  }

  .page-about .about-team__grid {
    gap: clamp(30px, 4vw, 56px);
  }
}
<<<END>>>