.page-about {
  --about-cell: rgba(7, 19, 32, 0.74);
  --about-soft-line: rgba(35, 66, 87, 0.55);
}

/* 首屏 */
.page-about .about-hero {
  padding-bottom: clamp(20px, 4vw, 34px);
}

.page-about .about-hero__head {
  max-width: 960px;
  margin-top: clamp(18px, 3vw, 30px);
}

.page-about .about-hero__head .title-xl {
  margin-top: 14px;
}

.page-about .about-hero__lead {
  margin-top: 18px;
  max-width: 60ch;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 5vw, 44px) 0 0;
  background: var(--about-soft-line);
  border: 1px solid var(--about-soft-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-facts__cell {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 18px;
  background: var(--ink-800);
}

.page-about .about-facts dt {
  font-size: 13px;
  line-height: 1.4;
  color: var(--muted);
  letter-spacing: 0.06em;
}

.page-about .about-facts dd {
  margin: 0;
  font-size: clamp(20px, 3.4vw, 24px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--text);
}

/* 时间轴 */
.page-about .about-timeline__title {
  margin-top: 12px;
  max-width: 22ch;
}

.page-about .about-timeline__lead {
  margin-top: 14px;
  max-width: 56ch;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .about-timeline__media {
  margin: clamp(24px, 4vw, 38px) 0 0;
}

.page-about .tl {
  list-style: none;
  margin: clamp(28px, 5vw, 44px) 0 0;
  padding: 0 0 0 28px;
  position: relative;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 24px;
  width: 1px;
  background: linear-gradient(180deg, rgba(243, 197, 107, 0.55), rgba(63, 224, 208, 0.42), rgba(35, 66, 87, 0.28));
}

.page-about .tl__item {
  position: relative;
  margin: 0 0 16px;
}

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

.page-about .tl__dot {
  position: absolute;
  left: -28px;
  top: 22px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(243, 197, 107, 0.14);
  z-index: 1;
}

.page-about .tl__item--current .tl__dot {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(63, 224, 208, 0.18), 0 0 18px rgba(63, 224, 208, 0.45);
}

.page-about .tl__node {
  border: 1px solid var(--about-soft-line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(19, 41, 61, 0.92), rgba(12, 30, 46, 0.92));
  box-shadow: var(--shadow-1);
  transition: border-color 0.24s var(--ease), transform 0.24s var(--ease);
}

.page-about .tl__node:hover,
.page-about .tl__node:focus-within {
  border-color: rgba(63, 224, 208, 0.58);
  transform: translateY(-2px);
}

.page-about .tl__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl__summary:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px rgba(63, 224, 208, 0.85);
  border-radius: var(--radius);
}

.page-about .tl__ver {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gold);
  border: 1px solid rgba(243, 197, 107, 0.35);
  border-radius: 999px;
  padding: 3px 10px;
}

.page-about .tl__item--current .tl__ver {
  color: var(--cyan);
  border-color: rgba(63, 224, 208, 0.42);
}

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

.page-about .tl__head {
  flex: 1 1 100%;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--text);
}

.page-about .tl__caret {
  width: 10px;
  height: 10px;
  margin-left: auto;
  border-right: 1.5px solid var(--cyan);
  border-bottom: 1.5px solid var(--cyan);
  transform: rotate(45deg);
  transition: transform 0.24s var(--ease);
}

.page-about .tl__node[open] .tl__caret {
  transform: rotate(-135deg);
}

.page-about .tl__body {
  padding: 0 18px 18px;
  border-top: 1px solid var(--about-soft-line);
  margin-top: 4px;
  padding-top: 14px;
}

.page-about .tl__body p {
  margin: 0 0 12px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .tl__body p:last-of-type {
  margin-bottom: 14px;
}

.page-about .tl__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .tl__stat {
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
  border: 1px solid var(--about-soft-line);
  border-radius: 999px;
  padding: 5px 12px;
}

.page-about .tl__stat b {
  color: var(--cyan);
  font-weight: 700;
  margin-right: 2px;
}

/* 横向版本带 */
.page-about .about-rail__title {
  margin-top: 12px;
}

.page-about .about-rail__wrap {
  margin-top: clamp(18px, 3vw, 26px);
  padding-bottom: 6px;
}

.page-about .about-rail__track {
  display: flex;
  gap: 14px;
  margin: 0;
  padding: 0 0 10px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__card {
  flex: 0 0 min(298px, 82vw);
  scroll-snap-align: start;
  padding: 18px 18px 20px;
  border-left: 2px solid rgba(243, 197, 107, 0.5);
}

.page-about .about-rail__card--current {
  border-left-color: var(--cyan);
  background: linear-gradient(180deg, rgba(23, 50, 75, 0.95), rgba(12, 30, 46, 0.95));
}

.page-about .about-rail__ver {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .about-rail__head {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
}

.page-about .about-rail__body {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-rail__note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--about-soft-line);
  font-size: 13px;
  color: rgba(157, 180, 198, 0.86);
}

/* 团队 */
.page-about .about-team__grid {
  display: grid;
  gap: clamp(24px, 4vw, 34px);
}

.page-about .about-team__title {
  margin-top: 12px;
}

.page-about .about-team__lead {
  margin-top: 14px;
  max-width: 52ch;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.85;
}

.page-about .about-team__list {
  list-style: none;
  margin: clamp(22px, 4vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-team__list li {
  padding: 14px 0 14px 16px;
  border-left: 2px solid rgba(63, 224, 208, 0.42);
  background: linear-gradient(90deg, rgba(19, 41, 61, 0.6), rgba(19, 41, 61, 0));
}

.page-about .about-team__list strong {
  display: block;
  font-size: 15px;
  color: var(--text);
  letter-spacing: 0.02em;
}

.page-about .about-team__list span {
  display: block;
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-team__media {
  margin: 0;
}

/* 访问画像 */
.page-about .about-numbers {
  background: linear-gradient(180deg, var(--ink-900), var(--ink-800));
  border-top: 1px solid var(--about-soft-line);
  border-bottom: 1px solid var(--about-soft-line);
}

.page-about .about-numbers__title {
  margin-top: 12px;
  max-width: 24ch;
}

.page-about .about-numbers__lead {
  margin-top: 14px;
  max-width: 58ch;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.85;
}

.page-about .about-numbers__grid {
  list-style: none;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--about-soft-line);
  border: 1px solid var(--about-soft-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .about-numbers__cell {
  padding: 20px;
  background: var(--about-cell);
}

.page-about .about-numbers__num {
  display: block;
  font-size: clamp(32px, 8vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-about .about-numbers__cell:nth-child(2) .about-numbers__num {
  color: var(--orange);
}

.page-about .about-numbers__cell:nth-child(4) .about-numbers__num {
  color: var(--gold);
}

.page-about .about-numbers__unit {
  display: block;
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
}

.page-about .about-numbers__cell p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* 三件坚持 */
.page-about .about-commit__title {
  margin-top: 12px;
}

.page-about .about-commit__list {
  list-style: none;
  margin: clamp(24px, 4vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-commit__item {
  position: relative;
  padding: 18px 20px 18px 56px;
  border: 1px solid var(--about-soft-line);
  border-radius: var(--radius);
  background: rgba(12, 30, 46, 0.62);
  transition: border-color 0.24s var(--ease), transform 0.24s var(--ease);
}

.page-about .about-commit__item:hover {
  border-color: rgba(243, 197, 107, 0.42);
  transform: translateY(-2px);
}

.page-about .about-commit__num {
  position: absolute;
  left: 18px;
  top: 20px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .about-commit__head {
  margin: 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-commit__item p {
  margin: 8px 0 0;
  max-width: 64ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* 往后看 */
.page-about .about-forward__title {
  margin-top: 12px;
}

.page-about .about-forward__lead {
  margin-top: 14px;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-forward__list {
  list-style: none;
  margin: clamp(22px, 4vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-forward__list li {
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
  padding: 12px 0 12px 18px;
  border-left: 1px solid rgba(255, 138, 61, 0.42);
}

.page-about .about-forward__list strong {
  color: var(--text);
  font-weight: 700;
}

.page-about .about-next {
  list-style: none;
  margin: clamp(26px, 4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-soft-line);
  border: 1px solid var(--about-soft-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-next li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding: 14px 16px;
  background: var(--ink-800);
}

.page-about .about-next__link {
  color: var(--cyan);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  color: var(--text);
  border-bottom-color: var(--cyan);
  outline: none;
}

.page-about .about-next__note {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* 收尾 */
.page-about .about-close__inner {
  display: grid;
  gap: clamp(20px, 3.4vw, 32px);
  align-items: center;
}

.page-about .about-close__media {
  margin: 0;
}

.page-about .about-close__title {
  margin-top: 12px;
}

.page-about .about-close__text {
  margin: 14px 0 0;
  max-width: 50ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

/* 断点 */
@media (min-width: 640px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .tl__head {
    flex: 1 1 auto;
  }

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

  .page-about .about-next li {
    flex-wrap: nowrap;
    align-items: baseline;
  }

  .page-about .about-next__link {
    flex: 0 0 auto;
  }
}

@media (min-width: 900px) {
  .page-about .tl {
    padding-left: 40px;
  }

  .page-about .tl::before {
    left: 9px;
  }

  .page-about .tl__dot {
    left: -38px;
    width: 18px;
    height: 18px;
  }

  .page-about .tl__node {
    padding-right: 6px;
  }

  .page-about .tl__summary {
    padding: 20px 24px;
    gap: 12px 16px;
  }

  .page-about .tl__head {
    font-size: 20px;
  }

  .page-about .tl__body {
    padding: 16px 24px 22px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: start;
    gap: 48px;
  }

  .page-about .about-team__media {
    margin-top: 12px;
  }

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

  .page-about .about-commit__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-commit__item {
    padding: 22px 20px 24px;
  }

  .page-about .about-commit__num {
    position: static;
    display: block;
    margin-bottom: 12px;
  }

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

  .page-about .about-close__inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 40px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-rail__card {
    flex-basis: 330px;
  }

  .page-about .tl__head {
    font-size: 22px;
  }
}
<<<END>>>