.page-about {
  --about-line: rgba(96, 121, 133, 0.32);
  --about-paper-line: rgba(11, 34, 51, 0.14);
  background: var(--sk-ink);
  color: var(--sk-text);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4vw, 44px) 0 clamp(40px, 6vw, 72px);
  border-bottom: 1px solid var(--about-line);
  background:
    radial-gradient(ellipse 60% 55% at 84% 4%, rgba(43, 242, 198, 0.12), transparent 68%),
    radial-gradient(ellipse 55% 45% at 4% 94%, rgba(244, 166, 58, 0.09), transparent 70%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(96, 121, 133, 0.14) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(96, 121, 133, 0.14) 1px, transparent 1px);
  background-size: 76px 76px;
  -webkit-mask-image: radial-gradient(ellipse 90% 78% at 38% 0%, #000 12%, transparent 76%);
  mask-image: radial-gradient(ellipse 90% 78% at 38% 0%, #000 12%, transparent 76%);
}

.page-about .about-hero .sk-container {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 32px);
  margin-top: clamp(18px, 3vw, 30px);
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-size: clamp(30px, 7vw, 64px);
  line-height: 1.06;
  letter-spacing: -0.03em;
  font-weight: 800;
  overflow-wrap: anywhere;
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.78;
  color: var(--sk-dim);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

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

.page-about .about-hero__ghost-num {
  display: block;
  font-size: clamp(76px, 9vw, 132px);
  line-height: 0.84;
  letter-spacing: -0.05em;
  color: var(--sk-teal);
  opacity: 0.3;
}

.page-about .about-hero__ghost-cap {
  display: block;
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--sk-dim);
  margin-top: 8px;
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-hero__stats li {
  background: var(--sk-ink-2);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .about-hero__num {
  font-size: clamp(24px, 3.2vw, 34px);
  line-height: 1;
  color: var(--sk-teal);
}

.page-about .about-hero__key {
  font-size: 12px;
  letter-spacing: 0.03em;
  color: var(--sk-dim);
}

/* ---------- 纵向版本时间线 ---------- */
.page-about .about-line {
  position: relative;
  padding: clamp(48px, 7vw, 88px) 0;
}

.page-about .about-line__head {
  max-width: 700px;
}

.page-about .about-tl {
  list-style: none;
  margin: clamp(30px, 5vw, 46px) 0 0;
  padding: 0 0 0 28px;
  position: relative;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, rgba(244, 166, 58, 0.7), rgba(96, 121, 133, 0.55) 42%, var(--sk-teal));
}

.page-about .about-tl__item {
  position: relative;
  min-width: 0;
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 18px;
  width: 9px;
  height: 9px;
  box-sizing: content-box;
  border-radius: 50%;
  background: var(--sk-ink);
  border: 2px solid var(--sk-steel);
}

.page-about .about-tl__item[data-state="switch"]::before {
  border-color: var(--sk-teal);
  background: var(--sk-teal);
  box-shadow: 0 0 0 5px rgba(43, 242, 198, 0.13);
}

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

.page-about .about-tl__summary {
  list-style: none;
  cursor: pointer;
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 14px;
  padding: 14px 36px 14px 0;
}

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

.page-about .about-tl__summary::after {
  content: "+";
  position: absolute;
  right: 2px;
  top: 12px;
  font-family: var(--sk-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--sk-steel);
  transition: color 0.18s ease;
}

.page-about .about-tl__fold[open] > .about-tl__summary::after {
  content: "−";
  color: var(--sk-teal);
}

.page-about .about-tl__summary:hover::after {
  color: var(--sk-teal);
}

.page-about .about-tl__year {
  font-family: var(--sk-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--sk-dim);
  min-width: 6.5em;
}

.page-about .about-tl__label {
  font-size: clamp(16px, 1.9vw, 20px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--sk-text);
}

.page-about .about-tl__batch {
  font-family: var(--sk-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--sk-amber);
  border: 1px solid rgba(244, 166, 58, 0.4);
  border-radius: var(--sk-r);
  padding: 2px 6px;
}

.page-about .about-tl__item[data-state="switch"] .about-tl__batch {
  color: var(--sk-teal);
  border-color: rgba(43, 242, 198, 0.45);
}

.page-about .about-tl__text {
  margin: 0 0 16px;
  max-width: 62ch;
  padding-right: 8px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--sk-dim);
}

.page-about .about-line__figure {
  margin: clamp(28px, 4vw, 44px) 0 0;
}

.page-about .about-line__figure .sk-figure__media {
  overflow: hidden;
  border: 1px solid var(--about-line);
  background: var(--sk-ink-2);
}

.page-about .about-line__figure img,
.page-about .about-shift__figure img,
.page-about .about-crew__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 状态带 ---------- */
.page-about .about-status {
  margin: 0;
  padding: 14px clamp(20px, 4vw, 56px);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  background: var(--sk-ink-2);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-status .sk-status__text {
  font-size: 13px;
  color: var(--sk-dim);
}

/* ---------- 改版前后结构 ---------- */
.page-about .about-shift {
  padding: clamp(48px, 7vw, 88px) 0;
  background: var(--sk-paper);
  color: var(--sk-paper-text);
}

.page-about .about-shift__head {
  max-width: 720px;
}

.page-about .about-shift .sk-title {
  color: var(--sk-paper-text);
}

.page-about .about-shift .sk-lead {
  color: var(--sk-paper-dim);
}

.page-about .about-shift .sk-eyebrow {
  color: var(--sk-paper-dim);
}

.page-about .about-shift__board {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: clamp(26px, 4vw, 38px);
}

.page-about .about-shift__arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--sk-mono);
  font-size: 20px;
  color: var(--sk-steel);
  padding: 4px 0;
  transform: rotate(90deg);
}

.page-about .about-shift__cap {
  margin: 0 0 10px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--sk-paper-dim);
}

.page-about .about-shift__cap span {
  font-family: var(--sk-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--sk-paper-text);
  border: 1px solid var(--about-paper-line);
  border-radius: var(--sk-r);
  padding: 2px 7px;
}

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

.page-about .about-shift__list li {
  padding: 11px 12px;
  border-bottom: 1px solid var(--about-paper-line);
  font-size: 16px;
  transition: background 0.18s ease, box-shadow 0.18s ease, color 0.18s ease;
}

.page-about .about-shift__list--old li {
  color: var(--sk-paper-dim);
  font-family: var(--sk-mono);
  font-size: 14px;
}

.page-about .about-shift__list--old li:hover {
  background: rgba(244, 166, 58, 0.16);
  box-shadow: inset 3px 0 0 var(--sk-amber);
  color: var(--sk-paper-text);
}

.page-about .about-shift__list--new li {
  font-weight: 700;
}

.page-about .about-shift__list--new li:hover {
  background: rgba(43, 242, 198, 0.18);
  box-shadow: inset 3px 0 0 var(--sk-teal);
}

.page-about .about-shift__figure {
  margin: clamp(26px, 4vw, 40px) 0 0;
}

.page-about .about-shift__figure .sk-figure__media {
  overflow: hidden;
  border: 1px solid var(--about-paper-line);
  background: var(--sk-glass);
}

.page-about .about-shift__figure .sk-figure__caption {
  color: var(--sk-paper-dim);
}

/* ---------- 分类三层 ---------- */
.page-about .about-layers {
  padding: clamp(48px, 7vw, 88px) 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-layers__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  margin-top: clamp(26px, 4vw, 38px);
  border-top: 1px solid var(--about-line);
}

.page-about .about-layers__item {
  padding: 22px 0;
  border-bottom: 1px solid var(--about-line);
  min-width: 0;
}

.page-about .about-layers__num {
  display: block;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--sk-amber);
  margin-bottom: 10px;
}

.page-about .about-layers__name {
  margin: 0 0 8px;
  font-size: 21px;
  letter-spacing: -0.01em;
}

.page-about .about-layers__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--sk-dim);
}

/* ---------- 路径对照 ---------- */
.page-about .about-mapsec {
  padding: clamp(48px, 7vw, 88px) 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-mapsec__rules {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
  max-width: 760px;
}

.page-about .about-mapsec__rules li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--sk-text);
}

.page-about .about-mapsec__rules li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 10px;
  height: 1px;
  background: var(--sk-teal);
}

.page-about .about-map {
  list-style: none;
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-map__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: baseline;
  gap: 4px 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-map__old {
  font-family: var(--sk-mono);
  font-size: 12.5px;
  letter-spacing: 0.01em;
  color: var(--sk-amber);
  overflow-wrap: anywhere;
}

.page-about .about-map__arrow {
  font-family: var(--sk-mono);
  color: var(--sk-steel);
}

.page-about .about-map__new {
  font-size: 15px;
  font-weight: 700;
  color: var(--sk-text);
}

.page-about .about-map__note {
  grid-column: 1 / -1;
  font-size: 13px;
  line-height: 1.65;
  color: var(--sk-dim);
}

/* ---------- 团队分工 ---------- */
.page-about .about-crew {
  padding: clamp(48px, 7vw, 88px) 0;
  background: var(--sk-paper);
  color: var(--sk-paper-text);
}

.page-about .about-crew .sk-title {
  color: var(--sk-paper-text);
}

.page-about .about-crew .sk-lead {
  color: var(--sk-paper-dim);
}

.page-about .about-crew .sk-eyebrow {
  color: var(--sk-paper-dim);
}

.page-about .about-crew__grid {
  list-style: none;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-top: 1px solid var(--about-paper-line);
}

.page-about .about-crew__item {
  padding: 20px 0;
  border-bottom: 1px solid var(--about-paper-line);
  min-width: 0;
}

.page-about .about-crew__num {
  display: block;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--sk-paper-dim);
  margin-bottom: 10px;
}

.page-about .about-crew__name {
  margin: 0 0 8px;
  font-size: 19px;
  letter-spacing: -0.01em;
}

.page-about .about-crew__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--sk-paper-dim);
}

.page-about .about-crew__figure {
  margin: clamp(26px, 4vw, 40px) 0 0;
}

.page-about .about-crew__figure .sk-figure__media {
  overflow: hidden;
  border: 1px solid var(--about-paper-line);
  background: var(--sk-glass);
}

.page-about .about-crew__figure .sk-figure__caption {
  color: var(--sk-paper-dim);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding: clamp(48px, 7vw, 88px) 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-next__list {
  list-style: none;
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-about .about-next__item {
  position: relative;
  padding-top: 18px;
  border-top: 1px solid var(--about-line);
  min-width: 0;
}

.page-about .about-next__item::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 44px;
  height: 2px;
  background: var(--sk-amber);
}

.page-about .about-next__tag {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--sk-ink);
  background: var(--sk-amber);
  border-radius: 2px;
  padding: 3px 8px;
  margin-bottom: 12px;
}

.page-about .about-next__name {
  margin: 0 0 8px;
  font-size: 19px;
  letter-spacing: -0.01em;
}

.page-about .about-next__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--sk-dim);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding: clamp(36px, 5vw, 58px) 0 clamp(48px, 6vw, 76px);
  border-top: 1px solid var(--about-line);
  background: linear-gradient(180deg, rgba(43, 242, 198, 0.07), transparent 62%);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  align-items: center;
}

.page-about .about-cta__title {
  margin: 0;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.page-about .about-cta__note {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--sk-dim);
}

.page-about .about-cta__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-cta__links a {
  display: inline-block;
  padding: 10px 16px;
  border: 1px solid var(--sk-steel);
  border-radius: var(--sk-r);
  color: var(--sk-text);
  text-decoration: none;
  font-size: 14px;
  transition: border-color 0.18s ease, background 0.18s ease, color 0.18s ease;
}

.page-about .about-cta__links a:hover,
.page-about .about-cta__links a:focus-visible {
  border-color: var(--sk-teal);
  background: rgba(43, 242, 198, 0.1);
  color: var(--sk-teal);
}

.page-about .about-cta__links a:focus-visible,
.page-about .about-tl__summary:focus-visible {
  outline: 2px solid var(--sk-teal);
  outline-offset: 3px;
}

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

@media (min-width: 760px) {
  .page-about .about-shift__board {
    grid-template-columns: minmax(0, 1fr) 44px minmax(0, 1fr);
    align-items: start;
    gap: 0;
  }

  .page-about .about-shift__arrow {
    transform: none;
    padding-top: 36px;
  }
}

@media (min-width: 820px) {
  .page-about .about-map__row {
    grid-template-columns: minmax(0, 200px) 26px minmax(0, 170px) minmax(0, 1fr);
    gap: 0 18px;
  }

  .page-about .about-map__note {
    grid-column: auto;
  }

  .page-about .about-next__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 30px;
  }

  .page-about .about-next__item:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .about-next__item:nth-child(3) {
    margin-top: 52px;
  }
}

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .about-hero__ghost {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    justify-content: flex-end;
    padding-right: 20px;
    border-right: 1px solid var(--about-line);
  }

  .page-about .about-layers__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1px;
    background: var(--about-line);
    border-top: 0;
  }

  .page-about .about-layers__item {
    background: var(--sk-ink);
    padding: 26px 24px;
    border-bottom: 0;
  }

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

  .page-about .about-crew__item {
    padding: 22px 26px 22px 0;
    border-bottom: 0;
    border-right: 1px solid var(--about-paper-line);
  }

  .page-about .about-crew__item:not(:first-child) {
    padding-left: 26px;
  }

  .page-about .about-crew__item:last-child {
    border-right: 0;
    padding-right: 0;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 40px;
  }
}

@media (min-width: 960px) {
  .page-about .about-tl {
    padding-left: 34px;
  }

  .page-about .about-tl__item::before {
    left: -33px;
    width: 11px;
    height: 11px;
    top: 16px;
  }

  .page-about .about-tl::before {
    left: 6px;
  }

  .page-about .about-tl__summary {
    padding: 16px 40px 16px 0;
  }

  .page-about .about-tl__text {
    font-size: 16px;
    padding-bottom: 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-shift__list li,
  .page-about .about-cta__links a,
  .page-about .about-tl__summary::after {
    transition: none;
  }
}
<<<END>>>