.page-about {
  --about-gap: clamp(1.25rem, 3.5vw, 2.25rem);
  --about-num: clamp(3rem, 9vw, 5.5rem);
  --about-shadow: 6px 6px 0 rgba(6, 24, 38, 0.92);
  padding-bottom: clamp(3rem, 7vw, 5rem);
  background-color: var(--c-abyss);
  background-image:
    linear-gradient(to right, rgba(28, 69, 96, 0.16) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(28, 69, 96, 0.16) 1px, transparent 1px);
  background-size: 72px 72px;
  color: var(--c-ice);
  font-family: var(--font-body);
}

.page-about .about-top {
  padding-top: clamp(1rem, 3vw, 1.5rem);
  padding-bottom: 0.5rem;
}

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--c-mist);
}

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

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

/* 首屏 */
.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  padding-top: clamp(1.5rem, 4vw, 2.5rem);
  padding-bottom: clamp(2rem, 5vw, 3.25rem);
}

.page-about .about-hero__lead h1 {
  margin: 0.7rem 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.1rem, 5.6vw, 3.7rem);
  line-height: 1.1;
  letter-spacing: -0.015em;
}

.page-about .about-hero__lede {
  margin: 1.1rem 0 0;
  max-width: 36em;
  font-size: clamp(1rem, 1.8vw, 1.0625rem);
  line-height: 1.9;
  color: rgba(233, 244, 248, 0.84);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.6rem;
}

.page-about .about-link {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(25, 227, 198, 0.5);
  transition: color var(--t-fast), border-color var(--t-fast);
}

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

/* 档案卡 */
.page-about .about-file {
  position: relative;
  padding: clamp(1.1rem, 3vw, 1.6rem);
  background: var(--c-panel);
  border: var(--line-thick);
  box-shadow: var(--shadow-hard);
  transform: rotate(-0.5deg);
}

.page-about .about-file__tag {
  display: inline-block;
  margin: 0;
  padding: 0.3rem 0.55rem;
  background: var(--c-paper);
  color: var(--c-abyss);
  border: 2px solid var(--c-abyss);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
}

.page-about .about-file__name {
  margin: 0.9rem 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.5rem;
  letter-spacing: -0.01em;
}

.page-about .about-file__desc {
  margin: 0.35rem 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--c-cyan);
}

.page-about .about-file__list {
  margin: 1.1rem 0 0;
  padding: 0;
  border-top: 1px solid var(--c-steel);
}

.page-about .about-file__row {
  display: grid;
  grid-template-columns: 5.2rem minmax(0, 1fr);
  gap: 0.6rem;
  padding: 0.6rem 0;
  border-bottom: 1px solid rgba(28, 69, 96, 0.75);
}

.page-about .about-file__row dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--c-mist);
  padding-top: 0.15rem;
}

.page-about .about-file__row dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--c-ice);
}

/* 主栅格 */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  padding-top: clamp(1rem, 3vw, 2rem);
}

/* 章节索引 */
.page-about .about-index {
  border-top: var(--line);
  border-bottom: var(--line);
  padding: 0.55rem 0;
}

.page-about .about-index__title {
  margin: 0 0 0.4rem;
  padding-left: 0.75rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--c-mist);
}

.page-about .about-index__list {
  display: flex;
  gap: 0.25rem;
  margin: 0;
  padding: 0 0.25rem;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index__list a {
  display: flex;
  align-items: baseline;
  gap: 0.45rem;
  padding: 0.45rem 0.6rem;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-mist);
  text-decoration: none;
  border: 1px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast), background-color var(--t-fast);
}

.page-about .about-index__list a span {
  font-size: 11px;
  color: var(--c-cyan);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--c-ice);
  border-color: var(--c-steel);
  background: rgba(25, 227, 198, 0.07);
}

/* 章节 */
.page-about .about-sec {
  padding-block: clamp(1.75rem, 4vw, 2.75rem);
  border-top: var(--line);
}

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

.page-about .about-sec__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(0.75rem, 2.5vw, 1.5rem);
  align-items: center;
  margin-bottom: 1.25rem;
}

.page-about .about-sec__no {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--about-num);
  line-height: 0.85;
  letter-spacing: -0.05em;
  color: var(--c-steel);
}

@supports ((-webkit-text-stroke: 1px #000)) {
  .page-about .about-sec__no {
    color: transparent;
    -webkit-text-stroke: 1.5px var(--c-steel);
  }
}

.page-about .about-sec__head h2 {
  margin: 0.3rem 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.4rem, 3.4vw, 2.05rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
}

.page-about .about-sec__body > * + * {
  margin-top: 1.1rem;
}

.page-about .about-p {
  max-width: 38em;
  margin: 0;
  font-size: 1rem;
  line-height: 1.9;
  color: rgba(233, 244, 248, 0.84);
}

/* 图片 */
.page-about .about-figure {
  margin: 1.4rem 0 0;
  border: var(--line-thick);
  background: var(--c-panel);
}

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

.page-about .about-figure .media__caption {
  padding: 0.7rem 0.9rem;
  border-top: 1px solid var(--c-steel);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.7;
  color: var(--c-mist);
}

/* 时间线 */
.page-about .tl {
  margin: 1.4rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1.1rem;
}

.page-about .tl__item {
  position: relative;
  padding-left: 1.7rem;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--c-abyss);
  border: 2px solid var(--c-cyan);
  z-index: 1;
}

.page-about .tl__item::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 1.35rem;
  bottom: -1.1rem;
  width: 2px;
  background: var(--c-steel);
}

.page-about .tl__item:last-child::after {
  display: none;
}

.page-about .tl__card {
  padding: 0.9rem 1rem;
  background: var(--c-panel);
  border: var(--line);
  transition: border-color var(--t-base), transform var(--t-base), box-shadow var(--t-base);
}

.page-about .tl__item:hover .tl__card,
.page-about .tl__item:focus-within .tl__card {
  border-color: var(--c-cyan);
  box-shadow: var(--about-shadow);
  transform: translate(-2px, -2px);
}

.page-about .tl__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
}

.page-about .tl__year {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--c-cyan);
}

.page-about .tl__title {
  margin: 0.4rem 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  line-height: 1.5;
}

.page-about .tl__text {
  margin: 0.4rem 0 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(233, 244, 248, 0.78);
}

/* 团队岗位 */
.page-about .crew {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.9rem;
  margin-top: 1.4rem;
}

.page-about .crew__card {
  background: var(--c-panel);
  border: var(--line);
  border-left: 4px solid var(--c-steel);
  transition: border-color var(--t-base), background-color var(--t-base);
}

.page-about .crew__card[open] {
  border-left-color: var(--c-cyan);
  background: rgba(11, 34, 57, 0.92);
}

.page-about .crew__card summary {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  padding: 0.85rem 1rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  color: var(--c-ice);
}

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

.page-about .crew__card summary:hover .crew__name,
.page-about .crew__card summary:focus-visible .crew__name {
  color: var(--c-cyan-soft);
}

.page-about .crew__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.3rem;
  line-height: 1;
  color: var(--c-amber);
}

.page-about .crew__name {
  transition: color var(--t-fast);
}

.page-about .crew__unit {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--c-mist);
}

.page-about .crew__body {
  margin: 0;
  padding: 0.85rem 1rem 1rem;
  border-top: 1px solid var(--c-steel);
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(233, 244, 248, 0.8);
}

/* 更新节奏数字 */
.page-about .cadence {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.75rem;
  margin: 1.4rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .cadence__item {
  padding: 0.9rem 1rem;
  background: var(--c-panel);
  border: var(--line);
  border-left: 3px solid var(--c-cyan);
}

.page-about .cadence__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.6rem, 4vw, 2.1rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-cyan);
}

.page-about .cadence__label {
  display: block;
  margin-top: 0.45rem;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--c-mist);
}

/* 合作生态 */
.page-about .partner-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.9rem;
  margin-top: 1.4rem;
}

.page-about .partner-card {
  padding: 1rem;
  background: var(--c-panel);
  border: var(--line);
  border-top: 3px solid var(--c-steel);
  transition: border-top-color var(--t-base), transform var(--t-base);
}

.page-about .partner-card:hover {
  border-top-color: var(--c-amber);
  transform: translateY(-2px);
}

.page-about .partner-card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
}

.page-about .partner-card p {
  margin: 0.5rem 0 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(233, 244, 248, 0.8);
}

/* 服务原则 */
.page-about .principles {
  margin: 1.4rem 0 0;
  padding: 0;
  list-style: none;
  border-top: var(--line);
}

.page-about .principles > li {
  display: grid;
  grid-template-columns: 2.4rem minmax(0, 1fr);
  gap: 0.9rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--c-steel);
}

.page-about .principles__k {
  padding-top: 0.25rem;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-cyan);
}

.page-about .principles h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
}

.page-about .principles p {
  margin: 0.4rem 0 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(233, 244, 248, 0.8);
}

/* 结尾引导 */
.page-about .about-cta {
  margin-top: 1.6rem;
  padding: clamp(1.1rem, 3vw, 1.6rem);
  background: linear-gradient(135deg, rgba(25, 227, 198, 0.12), rgba(255, 178, 62, 0.08));
  border: var(--line-thick);
  border-left: 6px solid var(--c-amber);
}

.page-about .about-cta h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.15rem, 2.6vw, 1.4rem);
  line-height: 1.35;
}

.page-about .about-cta p {
  margin: 0.6rem 0 0;
  max-width: 34em;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(233, 244, 248, 0.84);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1rem;
}

/* 断点 */
@media (min-width: 640px) {
  .page-about .cadence {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
  }
}

@media (min-width: 720px) {
  .page-about .crew,
  .page-about .partner-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 920px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: clamp(2rem, 4vw, 3.5rem);
    align-items: start;
  }

  .page-about .about-file {
    margin-top: 0.5rem;
  }

  .page-about .about-file__row {
    grid-template-columns: 5.8rem minmax(0, 1fr);
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: 188px minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.5rem);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 1.25rem;
    padding: 0.9rem 0;
    border: var(--line);
    border-top: var(--line-thick);
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-index__list a {
    border: 0;
    border-left: 2px solid transparent;
    padding: 0.55rem 0.9rem;
    white-space: normal;
  }

  .page-about .about-index__list a:hover,
  .page-about .about-index__list a:focus-visible {
    border-color: transparent;
    border-left-color: var(--c-cyan);
  }

  .page-about .about-p {
    font-size: 1.0625rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__card,
  .page-about .partner-card {
    transform: none !important;
  }
}
<<<END>>>