.page-about {
  --about-gap: clamp(1.25rem, 3vw, 2.5rem);
  --about-pad: clamp(2.5rem, 6vw, 5rem);
  background: var(--ink);
  color: var(--paper);
  overflow-x: clip;
}

.page-about .container {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* 首屏海报层 */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(1.25rem, 3vw, 2rem) clamp(2rem, 5vw, 4rem);
  background:
    repeating-linear-gradient(90deg, rgba(61, 242, 208, 0.045) 0 1px, transparent 1px 88px),
    linear-gradient(165deg, var(--ink) 0%, var(--ink-2) 62%, var(--ink) 100%);
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-hero__grid {
  display: grid;
  gap: var(--about-gap);
  align-items: end;
}

.page-about .about-hero__kicker {
  margin: 0 0 0.9rem;
  font-size: 0.74rem;
  letter-spacing: 0.24em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(2.15rem, 7.4vw, 5rem);
  line-height: 1.03;
  letter-spacing: -0.02em;
  color: var(--paper-bright);
  text-wrap: balance;
}

.page-about .about-hero__aside {
  border-left: 3px solid var(--orange);
  padding-left: clamp(0.9rem, 2vw, 1.5rem);
}

.page-about .about-hero__lede {
  margin: 0 0 1.35rem;
  font-size: clamp(0.98rem, 1.7vw, 1.08rem);
  line-height: 1.85;
  color: rgba(242, 230, 207, 0.84);
  max-width: 44ch;
}

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

.page-about .about-figure {
  position: relative;
  margin: clamp(1.75rem, 4vw, 3rem) 0 0;
  border: 1px solid var(--line-dark);
  background: var(--ink-2);
  overflow: hidden;
}

.page-about .about-figure .media-frame__image {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.05);
}

.page-about .about-figure--inset {
  margin-top: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .about-figure--side {
  margin: 0;
}

.page-about .about-figure .media-frame__tag {
  display: inline-block;
  margin: 0;
  padding: 0.45rem 0.7rem;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--ink);
  background: var(--paper);
  border-top: 1px solid var(--line-dark);
  width: 100%;
}

/* 章节骨架 */
.page-about .about-chapter {
  padding-block: var(--about-pad);
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-chapter--paper {
  background:
    repeating-linear-gradient(0deg, rgba(8, 24, 38, 0.035) 0 1px, transparent 1px 34px),
    var(--paper);
  color: var(--ink);
  border-bottom-color: var(--line-light);
}

.page-about .about-chapter__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 0.75rem 1rem;
  padding-bottom: clamp(1.1rem, 2.5vw, 1.75rem);
  margin-bottom: clamp(1.4rem, 3vw, 2.25rem);
  border-bottom: 1px solid currentColor;
  border-color: var(--line-dark);
}

.page-about .about-chapter--paper .about-chapter__head {
  border-color: var(--line-light);
}

.page-about .about-chapter__no {
  font-size: clamp(1.5rem, 4vw, 2.4rem);
  line-height: 0.9;
  font-weight: 600;
  color: var(--orange);
}

.page-about .about-chapter--paper .about-chapter__no {
  color: var(--seal);
}

.page-about .about-chapter__title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(1.5rem, 4.2vw, 2.5rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
}

/* 双栏与正文 */
.page-about .about-split {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-split--top {
  margin-top: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .about-prose p {
  margin: 0 0 1.05rem;
  font-size: clamp(0.98rem, 1.7vw, 1.05rem);
  line-height: 1.9;
  color: rgba(242, 230, 207, 0.85);
  max-width: 60ch;
}

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

.page-about .about-prose--wide {
  margin-bottom: clamp(1.5rem, 3vw, 2.25rem);
}

.page-about .about-prose--wide p {
  max-width: 68ch;
}

.page-about .about-chapter--paper .about-prose p {
  color: rgba(8, 24, 38, 0.84);
}

.page-about .about-side {
  padding-top: 0.9rem;
  border-top: 2px solid var(--cyan);
}

.page-about .about-side--ink {
  border-top-color: var(--seal);
}

.page-about .about-side__label {
  margin: 0 0 0.5rem;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .about-side--ink .about-side__label {
  color: var(--seal);
}

.page-about .about-side p:not(.about-side__label) {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(242, 230, 207, 0.68);
}

.page-about .about-chapter--paper .about-side p:not(.about-side__label) {
  color: rgba(8, 24, 38, 0.7);
}

/* 三条主线 */
.page-about .about-lines {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-line {
  display: grid;
  grid-template-columns: 2.25rem minmax(0, 1fr);
  gap: 0.9rem;
  padding-block: clamp(1rem, 2.5vw, 1.5rem);
  border-top: 1px solid var(--line-dark);
}

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

.page-about .about-line__no {
  font-size: 1rem;
  font-weight: 600;
  color: var(--orange);
  letter-spacing: 0.1em;
}

.page-about .about-line__title {
  margin: 0 0 0.5rem;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(1.05rem, 2.4vw, 1.3rem);
  color: var(--paper-bright);
}

.page-about .about-line__body p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.85;
  color: rgba(242, 230, 207, 0.78);
  max-width: 62ch;
}

/* 流程 */
.page-about .about-flow-wrap {
  margin-top: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .about-flow__label {
  margin: 0 0 0.9rem;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--steel);
}

.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-flow__step {
  position: relative;
  padding: 1rem 1rem 1.15rem;
  background: var(--ink-2);
  border: 1px solid var(--line-dark);
  border-left: 3px solid var(--archive);
  transition: transform var(--ease), border-color var(--ease);
}

.page-about .about-flow__step:hover,
.page-about .about-flow__step:focus-within {
  transform: translateY(-3px);
  border-left-color: var(--cyan);
}

.page-about .about-flow__no {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-flow__title {
  margin: 0 0 0.4rem;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1rem;
  color: var(--paper-bright);
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.75;
  color: rgba(242, 230, 207, 0.72);
}

/* 团队 */
.page-about .about-team {
  list-style: none;
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
  padding: 0;
  display: grid;
  gap: 0.35rem;
}

.page-about .about-team__item {
  padding-block: 0.85rem;
  border-bottom: 1px dashed var(--line-light);
}

.page-about .about-team__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.55rem;
}

.page-about .about-team__name {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 0.98rem;
  color: var(--ink);
}

.page-about .about-team__num {
  font-size: 0.86rem;
  color: var(--archive);
}

.page-about .about-team__bar-wrap {
  height: 8px;
  background: rgba(8, 24, 38, 0.12);
}

.page-about .about-team__bar {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--archive), var(--orange));
}

/* 数据 */
.page-about .about-stats {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-stat {
  padding-top: 0.85rem;
  border-top: 3px solid var(--orange);
}

.page-about .about-stat:nth-child(2) {
  border-top-color: var(--cyan);
}

.page-about .about-stat:nth-child(3) {
  border-top-color: var(--archive);
}

.page-about .about-stat__num {
  display: block;
  font-size: clamp(2rem, 6.5vw, 3.4rem);
  line-height: 1;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--paper-bright);
}

.page-about .about-stat__label {
  margin: 0.6rem 0 0;
  font-size: 0.88rem;
  line-height: 1.7;
  color: rgba(242, 230, 207, 0.7);
  max-width: 26ch;
}

/* 时间轴 */
.page-about .about-timeline-layout {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-years {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: clamp(1.25rem, 3vw, 1.85rem);
}

.page-about .about-years__link {
  display: inline-block;
  padding: 0.32rem 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--paper);
  text-decoration: none;
  border: 1px solid var(--line-dark);
  transition: color var(--ease), border-color var(--ease), background-color var(--ease);
}

.page-about .about-years__link:hover {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-years__link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 clamp(1.4rem, 3vw, 2rem) 1.6rem;
  border-left: 1px solid var(--line-dark);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 0.35rem;
  width: 9px;
  height: 9px;
  background: var(--ink);
  border: 2px solid var(--archive);
  border-radius: 50%;
  transition: border-color var(--ease), box-shadow var(--ease);
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px rgba(61, 242, 208, 0.16);
}

.page-about .about-timeline__year {
  display: inline-block;
  margin-bottom: 0.45rem;
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .about-timeline__title {
  margin: 0 0 0.45rem;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(1rem, 2.2vw, 1.16rem);
  color: var(--paper-bright);
}

.page-about .about-timeline__item p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.82;
  color: rgba(242, 230, 207, 0.74);
  max-width: 56ch;
}

/* 合作与资质 */
.page-about .about-partner-grid {
  display: grid;
  gap: 1rem;
}

.page-about .about-partner {
  padding: 1.1rem 1rem 1.2rem;
  background: rgba(8, 24, 38, 0.05);
  border: 1px solid var(--line-light);
  border-top: 3px solid var(--archive);
}

.page-about .about-partner--signal {
  background: var(--orange);
  border-color: var(--seal);
  border-top-color: var(--ink);
}

.page-about .about-partner--quiet {
  border-top-color: var(--moss);
}

.page-about .about-partner__num {
  display: block;
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  line-height: 1;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-partner--signal .about-partner__num {
  color: var(--ink);
}

.page-about .about-partner__title {
  margin: 0.55rem 0 0.5rem;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 0.98rem;
  color: var(--ink);
}

.page-about .about-partner p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.78;
  color: rgba(8, 24, 38, 0.76);
}

.page-about .about-partner--signal p {
  color: rgba(8, 24, 38, 0.88);
}

.page-about .about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: clamp(1.25rem, 3vw, 1.75rem) 0 0;
  padding: 0;
  list-style: none;
}

/* 联系 */
.page-about .about-contact {
  padding: clamp(1.15rem, 3vw, 1.75rem);
  background: var(--ink-2);
  border: 1px solid var(--line-dark);
  border-top: 3px solid var(--cyan);
}

.page-about .about-contact__label {
  margin: 0 0 0.5rem;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .about-contact__text {
  margin: 0 0 1rem;
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(242, 230, 207, 0.75);
}

.page-about .about-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.page-about .about-contact__ghost {
  background: transparent;
  color: var(--paper);
  border: 1px solid var(--line-dark);
}

.page-about .about-contact__ghost:hover,
.page-about .about-contact__ghost:focus-visible {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* 平板及以上 */
@media (min-width: 48em) {
  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.15rem;
  }

  .page-about .about-stats {
    grid-template-columns: 1.3fr 1fr 1fr;
    align-items: start;
  }

  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.35rem 2rem;
  }

  .page-about .about-partner-grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-partner--signal {
    grid-column: 1 / -1;
  }
}

/* 桌面 */
@media (min-width: 60em) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 4rem);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.78fr);
    gap: clamp(2rem, 4vw, 3.5rem);
    align-items: start;
  }

  .page-about .about-side {
    margin-top: 0.35rem;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 2rem;
  }

  .page-about .about-flow__step:not(:last-child)::after {
    content: "→";
    position: absolute;
    right: -1.35rem;
    top: 50%;
    transform: translateY(-50%);
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--cyan);
    opacity: 0.75;
  }

  .page-about .about-timeline-layout {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.85fr);
    gap: clamp(2rem, 4vw, 3.5rem);
    align-items: start;
  }

  .page-about .about-partner-grid {
    grid-template-columns: 1.15fr 1fr 1fr;
  }

  .page-about .about-partner--signal {
    grid-column: auto;
  }

  .page-about .about-line {
    grid-template-columns: 3.25rem minmax(0, 1fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-flow__step,
  .page-about .about-timeline__item::before,
  .page-about .about-years__link {
    transition: none;
  }

  .page-about .about-flow__step:hover,
  .page-about .about-flow__step:focus-within {
    transform: none;
  }
}
<<<END>>>