.page-about {
  --about-gap: 24px;
  --about-hair: rgba(201, 255, 245, .12);
}

.page-about .about-crumbs {
  padding-top: 18px;
}

.page-about .about-cover {
  padding-top: 20px;
  padding-bottom: 8px;
}

.page-about .about-cover__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .about-cover__text {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .about-cover__title {
  margin: 0;
  font-family: var(--font-narrow);
  font-weight: 800;
  font-size: clamp(30px, 7vw, 54px);
  line-height: 1.16;
  letter-spacing: .04em;
  color: var(--ice);
  text-wrap: balance;
}

.page-about .about-cover__lede {
  margin: 0;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(234, 244, 255, .82);
}

.page-about .about-cover__sub {
  margin: 0;
  max-width: 46ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .cover-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 8px;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .cover-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  background: rgba(7, 27, 48, .72);
}

.page-about .cover-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 5vw, 30px);
  line-height: 1.1;
  color: var(--mint);
  letter-spacing: .02em;
}

.page-about .cover-stat__plus {
  font-size: .62em;
  color: rgba(0, 229, 195, .72);
}

.page-about .cover-stat__label {
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--mist);
}

.page-about .about-cover__media {
  position: relative;
  margin: 0;
  border-radius: var(--radius-l);
  border: 1px solid var(--line);
  overflow: hidden;
  box-shadow: var(--shadow-2);
  background:
    repeating-linear-gradient(135deg, rgba(201, 255, 245, .05) 0 1px, transparent 1px 12px),
    var(--ink-900);
}

.page-about .about-cover__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.page-about .about-cover__badge {
  position: absolute;
  left: 14px;
  bottom: 14px;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  background: var(--cream);
  color: var(--brown);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
}

.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  padding-top: 44px;
  padding-bottom: 8px;
}

.page-about .about-index {
  display: none;
}

.page-about .about-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--mist);
  text-transform: uppercase;
}

.page-about .about-index__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 1px solid var(--about-hair);
}

.page-about .about-index__link {
  display: block;
  padding: 9px 0 9px 14px;
  margin-left: -1px;
  border-left: 1px solid transparent;
  font-size: 14px;
  color: var(--mist);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--mint);
  border-left-color: var(--mint);
}

.page-about .about-content {
  min-width: 0;
}

.page-about .about-section {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-section + .about-section {
  margin-top: 52px;
  padding-top: 36px;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-h2 {
  position: relative;
  margin: 0 0 14px;
  padding-left: 18px;
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: clamp(21px, 4.4vw, 30px);
  line-height: 1.35;
  letter-spacing: .05em;
  color: var(--ice);
}

.page-about .about-h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: .32em;
  bottom: .32em;
  width: 3px;
  border-radius: 2px;
  background: var(--line-strong);
  transition: background var(--dur) var(--ease);
}

.page-about .about-section.is-active .about-h2::before {
  background: var(--mint);
}

.page-about .about-lead {
  margin: 0 0 26px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(234, 244, 255, .76);
}

/* 时间轴 */
.page-about .tl {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  margin: 0 0 30px;
  padding: 0;
  list-style: none;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: var(--about-hair);
}

.page-about .tl__link {
  display: grid;
  grid-template-columns: 16px minmax(0, 1fr);
  column-gap: 14px;
  padding: 10px 0;
  text-decoration: none;
}

.page-about .tl__dot {
  grid-row: 1 / span 2;
  width: 15px;
  height: 15px;
  margin-top: 3px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  background: var(--ink-900);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .tl__year {
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.4;
  color: var(--mint);
  letter-spacing: .08em;
}

.page-about .tl__label {
  font-size: 14px;
  line-height: 1.6;
  color: rgba(234, 244, 255, .7);
}

.page-about .tl__link:hover .tl__dot,
.page-about .tl__link:focus-visible .tl__dot {
  background: var(--mint);
  border-color: var(--mint);
  box-shadow: 0 0 0 4px rgba(0, 229, 195, .14);
}

.page-about .tl__link:hover .tl__label,
.page-about .tl__link:focus-visible .tl__label {
  color: var(--ice);
}

.page-about .tl__item--now .tl__dot {
  border-color: var(--coral);
  background: var(--coral);
  box-shadow: 0 0 0 4px rgba(255, 107, 74, .16);
}

.page-about .tl__item--now .tl__year {
  color: var(--coral);
}

/* 年份段落 */
.page-about .year-list {
  display: grid;
  gap: 0;
}

.page-about .year-item {
  padding: 18px 0;
  border-bottom: 1px dashed var(--line-soft);
  scroll-margin-top: calc(var(--header-h) + 28px);
}

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

.page-about .year-item__year {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--mint);
}

.page-about .year-item__title {
  margin: 0 0 6px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 17.5px;
  line-height: 1.5;
  color: var(--ice);
}

.page-about .year-item__text {
  margin: 0;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(234, 244, 255, .72);
}

/* 校验流程 */
.page-about .quality-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  align-items: start;
}

.page-about .steps {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .step {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 12px;
  padding: 16px 16px 16px 18px;
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--mint);
  border-radius: var(--radius-s);
  background: linear-gradient(90deg, rgba(0, 229, 195, .07), rgba(201, 255, 245, .015));
}

.page-about .step__num {
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.5;
  color: var(--mint);
  letter-spacing: .06em;
}

.page-about .step__title {
  margin: 0 0 4px;
  font-size: 16px;
  font-weight: 600;
  color: var(--ice);
}

.page-about .step__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(234, 244, 255, .7);
}

.page-about .about-figure {
  margin: 0;
  border-radius: var(--radius-m);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-900);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-figure__cap {
  padding: 10px 14px 12px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-note {
  margin: 22px 0 0;
  padding: 14px 16px;
  border-radius: var(--radius-s);
  border: 1px dashed var(--line);
  background: rgba(7, 27, 48, .5);
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(234, 244, 255, .74);
}

/* 团队 */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-bottom: 26px;
}

.page-about .team-card {
  padding: 16px 18px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  background: linear-gradient(180deg, rgba(201, 255, 245, .055), rgba(201, 255, 245, .012));
}

.page-about .team-card__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1.1;
  color: var(--mint);
}

.page-about .team-card__label {
  margin: 6px 0 6px;
  font-size: 15px;
  font-weight: 600;
  color: var(--ice);
}

.page-about .team-card__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .team-media {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  align-items: center;
}

.page-about .team-media__text {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .team-note-title {
  margin: 0;
  font-family: var(--font-narrow);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--ice);
}

.page-about .team-note-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(234, 244, 255, .72);
}

/* 运营档案卡 */
.page-about .about-file {
  padding: 22px 20px;
  border-radius: var(--radius-l);
  background: var(--cream);
  color: var(--brown);
  box-shadow: var(--shadow-1);
}

.page-about .about-file__kicker {
  margin: 0 0 6px;
  font-family: var(--font-serif);
  font-size: 13px;
  letter-spacing: .22em;
  color: rgba(26, 20, 16, .55);
}

.page-about .file-list {
  margin: 0;
}

.page-about .file-row {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 10px;
  padding: 11px 0;
  border-bottom: 1px solid rgba(26, 20, 16, .12);
}

.page-about .file-row dt {
  font-size: 13px;
  line-height: 1.7;
  color: rgba(26, 20, 16, .58);
}

.page-about .file-row dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--brown);
  overflow-wrap: anywhere;
}

.page-about .file-row__mono {
  font-family: var(--font-mono);
  letter-spacing: .01em;
}

.page-about .copy-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.page-about .copy-row .copy-btn {
  padding: 8px 14px;
  border: 1px solid rgba(26, 20, 16, .3);
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--brown);
  font-family: var(--font-sans);
  font-size: 13px;
  letter-spacing: .04em;
  cursor: pointer;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .copy-row .copy-btn:hover,
.page-about .copy-row .copy-btn:focus-visible {
  background: var(--brown);
  color: var(--cream);
  border-color: var(--brown);
}

.page-about .copy-row .copy-btn[data-copied="true"] {
  background: var(--coral);
  border-color: var(--coral);
  color: #fff;
}

.page-about .about-file__note {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: rgba(26, 20, 16, .62);
}

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

.page-about .about-links .btn {
  text-decoration: none;
}

/* 动效：仅位移，保证无脚本时可读 */
.page-about [data-reveal] {
  transition: transform .5s var(--ease);
}

.page-about [data-reveal]:not(.is-visible) {
  transform: translateY(10px);
}

@media (min-width: 600px) {
  .page-about .cover-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .file-row {
    grid-template-columns: 88px minmax(0, 1fr);
  }
}

@media (min-width: 860px) {
  .page-about .about-body {
    grid-template-columns: 1fr;
  }

  .page-about .tl {
    grid-auto-flow: column;
    grid-auto-columns: minmax(0, 1fr);
    gap: 8px;
    margin-bottom: 34px;
  }

  .page-about .tl::before {
    left: 8px;
    right: 8px;
    top: 11px;
    bottom: auto;
    width: auto;
    height: 1px;
  }

  .page-about .tl__link {
    grid-template-columns: minmax(0, 1fr);
    row-gap: 6px;
    padding: 0 10px 0 0;
  }

  .page-about .tl__dot {
    grid-row: auto;
    justify-self: start;
    margin: 4px 0 10px;
  }

  .page-about .year-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 32px;
  }

  .page-about .year-item:nth-last-child(2) {
    border-bottom: 1px dashed var(--line-soft);
  }

  .page-about .quality-grid {
    grid-template-columns: 1.08fr .92fr;
    gap: 30px;
  }

  .page-about .team-media {
    grid-template-columns: .95fr 1.05fr;
    gap: 28px;
  }
}

@media (min-width: 960px) {
  .page-about .about-cover {
    padding-top: 28px;
  }

  .page-about .about-cover__grid {
    grid-template-columns: 1.06fr .94fr;
    gap: 40px;
    align-items: center;
  }

  .page-about .about-body {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 52px;
    padding-top: 56px;
  }

  .page-about .about-index {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 24px);
    align-self: start;
  }

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

  .page-about .about-file {
    padding: 26px 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal],
  .page-about [data-reveal]:not(.is-visible) {
    transition: none;
    transform: none;
  }
}
<<<END>>>