.page-about {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

.page-about .crumbs {
  padding-top: 18px;
  font-size: 12.5px;
  color: var(--ink-soft);
}

.page-about .crumbs a {
  color: var(--ink-dim);
  text-decoration: none;
}

.page-about .crumbs a:hover {
  color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 22px 0 12px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 100%;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: 0.22;
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: 30px;
}

.page-about .about-hero__kicker {
  margin: 0 0 16px;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  font-size: clamp(30px, 8.4vw, 72px);
  font-weight: 300;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 54ch;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--ink-dim);
}

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

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

.page-about .about-index a {
  display: flex;
  gap: 14px;
  align-items: baseline;
  padding: 12px 2px;
  color: var(--ink);
  text-decoration: none;
  font-size: 14.5px;
  transition: color 0.16s var(--ease), padding-left 0.16s var(--ease);
}

.page-about .about-index a:hover {
  color: var(--cyan);
  padding-left: 6px;
}

.page-about .about-index__num {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

/* ---------- 通用章节 ---------- */
.page-about .section {
  padding: 52px 0;
}

.page-about .about-h2 {
  margin: 0 0 16px;
  font-size: clamp(23px, 4.4vw, 38px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-sec-head {
  max-width: 62ch;
  margin: 0 0 26px;
}

.page-about .about-sec-lead {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-dim);
}

/* ---------- 01 起点 ---------- */
.page-about .about-origin {
  border-top: 1px solid var(--line);
}

.page-about .about-origin .span-7 p {
  margin: 0 0 16px;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--ink-dim);
}

.page-about .about-note {
  margin: 22px 0 0;
  padding: 14px 0 14px 18px;
  border-left: 2px solid var(--cyan);
  background: linear-gradient(90deg, rgba(0, 240, 200, 0.08), transparent 72%);
  color: var(--ink);
  font-size: 15.5px;
  line-height: 1.75;
}

/* ---------- 02 时间轴 ---------- */
.page-about .about-stages {
  background: var(--bg-deep);
  clip-path: polygon(0 26px, 100% 0, 100% 100%, 0 100%);
  padding-top: calc(52px + 26px);
}

.page-about .about-stage-media {
  margin: 0 0 28px;
}

.page-about .about-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 30px;
}

.page-about .about-filter__btn {
  appearance: none;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 2px;
  padding: 8px 14px;
  font: inherit;
  font-size: 13px;
  color: var(--ink-dim);
  cursor: pointer;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease), background 0.16s var(--ease);
}

.page-about .about-filter__btn:hover {
  color: var(--ink);
  border-color: var(--ink-soft);
}

.page-about .about-filter__btn[aria-pressed="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--bg);
  font-weight: 700;
}

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

.page-about .tl__item {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 14px;
}

.page-about .tl__item[hidden] {
  display: none;
}

.page-about .tl__rail {
  position: relative;
}

.page-about .tl__year {
  display: block;
  padding-top: 2px;
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--ink-dim);
}

.page-about .tl__node {
  display: block;
  width: 10px;
  height: 10px;
  margin-top: 12px;
  border: 1px solid var(--cyan);
  transform: rotate(45deg);
  background: var(--bg-deep);
  box-shadow: 0 0 0 4px rgba(0, 240, 200, 0.08);
}

.page-about .tl__item:not(:last-child) .tl__rail::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 32px;
  bottom: -20px;
  width: 1px;
  background: var(--line);
}

.page-about .tl__body {
  padding-bottom: 34px;
}

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

.page-about .tl__kicker {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--ink-soft);
}

.page-about .tl__title {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .tl__text {
  margin: 0 0 14px;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--ink-dim);
}

.page-about .tl__stat {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  margin: 0;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: rgba(0, 240, 200, 0.05);
}

.page-about .tl__stat-num {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .tl__stat-label {
  font-size: 12.5px;
  color: var(--ink-dim);
}

/* ---------- 03 团队 ---------- */
.page-about .about-team__top {
  row-gap: 28px;
}

.page-about .about-team__p {
  margin: 0 0 16px;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--ink-dim);
}

.page-about .about-team__band {
  margin-top: 24px;
}

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

.page-about .team-fold {
  margin-top: 34px;
}

.page-about .team-item {
  border-top: 1px solid var(--line);
  padding: 14px 0;
}

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

.page-about .team-item__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .team-item__name {
  font-size: 15.5px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .team-item__tag {
  flex: none;
}

.page-about .team-item__body p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-dim);
}

/* ---------- 04 版本 ---------- */
.page-about .about-versions {
  border-top: 1px solid var(--line);
}

.page-about .about-ver {
  display: grid;
  gap: 32px;
}

.page-about .about-ver__copy p {
  margin: 0 0 16px;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--ink-dim);
}

.page-about .about-ver__band {
  margin: 22px 0;
}

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

.page-about .about-ver__list li {
  position: relative;
  margin: 0;
  padding: 11px 0 11px 20px;
  border-top: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink-dim);
}

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

.page-about .about-ver__list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 20px;
  width: 6px;
  height: 6px;
  background: var(--violet);
}

.page-about .about-ver__figure {
  position: relative;
  padding-top: 14px;
}

.page-about .about-ver__figure::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 62%;
  height: 2px;
  background: var(--violet);
  transform: skewY(-6deg);
  transform-origin: left top;
}

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

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 05 服务与联系 ---------- */
.page-about .about-reach {
  background: var(--bg-deep);
  border-top: 1px solid var(--line);
}

.page-about .about-reach__p {
  margin: 0;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--ink-dim);
}

.page-about .about-contact {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-contact li {
  display: grid;
  grid-template-columns: 86px minmax(0, 1fr);
  gap: 14px;
  padding: 12px 0;
  border-top: 1px solid var(--line);
  font-size: 15px;
}

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

.page-about .about-contact__k {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ink-soft);
  padding-top: 3px;
}

.page-about .about-contact__v {
  color: var(--ink);
  word-break: break-word;
}

.page-about .about-reach__label {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--ink-soft);
}

.page-about .about-links {
  display: grid;
  gap: 2px;
}

.page-about .about-link {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 13px 14px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: rgba(232, 241, 236, 0.02);
  color: var(--ink);
  text-decoration: none;
  font-size: 15px;
  line-height: 1.6;
  transition: border-color 0.16s var(--ease), color 0.16s var(--ease), background 0.16s var(--ease);
}

.page-about .about-link .mono {
  flex: none;
  font-size: 12px;
  color: var(--orange);
}

.page-about .about-link:hover {
  border-color: var(--cyan);
  background: rgba(0, 240, 200, 0.06);
}

.page-about .about-link:hover span:last-child {
  color: var(--cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-filter {
    gap: 10px;
  }

  .page-about .tl__item {
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 26px;
  }

  .page-about .tl__year {
    font-size: 13px;
  }

  .page-about .tl__body {
    padding-bottom: 44px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 34px 0 18px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3.4fr);
    gap: 48px;
    align-items: end;
  }

  .page-about .about-index {
    margin-bottom: 6px;
  }

  .page-about .section {
    padding: 82px 0;
  }

  .page-about .about-stages {
    padding-top: calc(82px + 26px);
  }

  .page-about .tl__item {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 40px;
  }

  .page-about .tl__title {
    font-size: 25px;
  }

  .page-about .about-team__top {
    align-items: start;
  }

  .page-about .team-fold {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 44px;
    margin-top: 44px;
  }

  .page-about .team-item {
    border-bottom: 0;
  }

  .page-about .team-item:nth-last-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }

  .page-about .team-item__head {
    cursor: default;
  }

  .page-about .team-item > .team-item__body {
    display: block;
  }

  .page-about .about-ver {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3.4fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-ver__figure {
    position: sticky;
    top: 76px;
    padding-top: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
  }
}
<<<END>>>