.page-about {
  --about-grid: rgba(63, 224, 200, 0.07);
  --about-dash: rgba(154, 168, 188, 0.28);
}

.page-about .crumbs {
  margin-top: 22px;
  font-size: 0.84rem;
  color: var(--muted);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  margin-top: 18px;
}

.page-about .about-hero__frame {
  position: relative;
  border: 1px solid var(--line);
  padding: 54px 20px 46px;
  background:
    repeating-linear-gradient(0deg, var(--about-grid) 0 1px, transparent 1px 32px),
    repeating-linear-gradient(90deg, var(--about-grid) 0 1px, transparent 1px 32px),
    linear-gradient(158deg, rgba(19, 31, 51, 0.96) 0%, rgba(11, 22, 38, 0.72) 58%, rgba(11, 22, 38, 0.94) 100%);
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  right: -1px;
  top: 32px;
  width: 3px;
  height: 96px;
  background: linear-gradient(180deg, var(--cyan), transparent);
}

.page-about .about-hero__corner {
  position: absolute;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--muted);
  pointer-events: none;
}

.page-about .about-hero__corner--tl { top: 9px; left: 12px; }
.page-about .about-hero__corner--tr { top: 9px; right: 12px; }
.page-about .about-hero__corner--bl { bottom: 9px; left: 12px; }
.page-about .about-hero__corner--br { bottom: 9px; right: 12px; }

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 6.6vw, 3.9rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin: 16px 0 0;
  max-width: 20ch;
}

.page-about .about-hero__lede {
  margin-top: 20px;
  max-width: 38rem;
  color: var(--text-2);
}

.page-about .about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 36px;
  margin-top: 32px;
  padding-top: 22px;
  border-top: 1px dashed var(--about-dash);
}

.page-about .stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  line-height: 1.15;
  color: var(--cyan);
}

.page-about .stat__label {
  font-size: 0.82rem;
  color: var(--muted);
}

.page-about .about-hero__fig {
  margin: 18px 0 0;
}

.page-about .about-hero__fig img,
.page-about .about-team__fig img,
.page-about .about-upkeep__fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

/* ---------- 章节索引条 ---------- */
.page-about .about-index {
  margin-top: 26px;
  padding: 10px 0;
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__tag {
  flex: 0 0 auto;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--cyan);
  border: 1px solid var(--line-cyan);
  padding: 3px 8px;
}

.page-about .about-index__list {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index__list a {
  display: block;
  white-space: nowrap;
  padding: 5px 10px;
  font-size: 0.86rem;
  color: var(--text-2);
  text-decoration: none;
  border: 1px solid transparent;
  transition: color 150ms var(--ease), border-color 150ms var(--ease);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--cyan);
  border-color: var(--line-cyan);
}

/* ---------- 通用区块间距 ---------- */
.page-about .section {
  scroll-margin-top: 90px;
  margin-top: 68px;
}

.page-about .section h2 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.015em;
  font-size: clamp(1.55rem, 3.6vw, 2.4rem);
  line-height: 1.16;
  margin: 12px 0 0;
  max-width: 24ch;
}

/* ---------- 纵向时间线 ---------- */
.page-about .about-journey__lede {
  margin-top: 16px;
  max-width: 36rem;
  color: var(--text-2);
}

.page-about .tl {
  position: relative;
  margin: 40px 0 0;
  padding: 0 0 0 30px;
  list-style: none;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(63, 224, 200, 0.16) 60%, transparent 100%);
}

.page-about .tl__item {
  position: relative;
  padding-bottom: 38px;
  outline: none;
}

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

.page-about .tl__node {
  position: absolute;
  left: -36px;
  top: 5px;
  width: 11px;
  height: 11px;
  background: var(--ink);
  border: 2px solid var(--cyan);
  transform: rotate(45deg);
  transition: background-color 150ms var(--ease);
}

.page-about .tl__item:hover .tl__node,
.page-about .tl__item:focus-within .tl__node {
  background: var(--amber);
  border-color: var(--amber);
}

.page-about .tl__year {
  margin: 0;
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--cyan-soft);
}

.page-about .tl__title {
  margin: 8px 0 0;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1.12rem;
  line-height: 1.4;
  color: var(--text);
}

.page-about .tl__text {
  margin: 8px 0 0;
  max-width: 36rem;
  color: var(--text-2);
  font-size: 0.97rem;
  line-height: 1.75;
}

.page-about .tl__item:focus-visible {
  box-shadow: inset 0 0 0 1px var(--line-cyan);
}

/* ---------- 服务对象 ---------- */
.page-about .who {
  display: grid;
  gap: 16px;
  margin-top: 32px;
}

.page-about .who__card {
  border: 1px solid var(--line);
  background: var(--ink-2);
  padding: 22px 20px 24px;
  transition: border-color 150ms var(--ease), transform 150ms var(--ease);
}

.page-about .who__card:hover {
  border-color: var(--line-cyan);
}

.page-about .who__tag {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .who__card h3 {
  margin: 10px 0 0;
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.45;
}

.page-about .who__card p {
  margin: 10px 0 0;
  color: var(--text-2);
  font-size: 0.94rem;
  line-height: 1.72;
}

/* ---------- 团队分工 ---------- */
.page-about .about-team__lede {
  margin-top: 16px;
  max-width: 40rem;
  color: var(--text-2);
}

.page-about .about-team__fig {
  margin: 32px 0 0;
}

.page-about .team {
  margin-top: 34px;
  border-top: 1px solid var(--line);
}

.page-about .team__row {
  display: grid;
  gap: 16px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .team__idx {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .team__desc h3 {
  margin: 8px 0 0;
  font-size: 1.14rem;
  font-weight: 600;
}

.page-about .team__desc p {
  margin: 10px 0 0;
  color: var(--text-2);
  font-size: 0.95rem;
  line-height: 1.76;
  max-width: 34rem;
}

.page-about .team__out .fold {
  border: 1px solid var(--line);
  background: var(--ink-2);
  transition: border-color 150ms var(--ease);
}

.page-about .team__out .fold:hover {
  border-color: var(--line-cyan);
}

.page-about .team__out .fold__inner ul {
  margin: 0;
  padding-left: 18px;
  list-style: none;
}

.page-about .team__out .fold__inner li {
  position: relative;
  color: var(--text-2);
  font-size: 0.92rem;
  line-height: 1.7;
  padding-left: 14px;
}

.page-about .team__out .fold__inner li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.66em;
  width: 6px;
  height: 1px;
  background: var(--cyan);
}

/* ---------- 能力清单 ---------- */
.page-about .caps {
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .caps__item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  column-gap: 14px;
  row-gap: 6px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
  transition: background-color 150ms var(--ease);
}

.page-about .caps__item:hover {
  background: rgba(36, 52, 73, 0.28);
}

.page-about .caps__no {
  grid-row: 1 / span 2;
  padding-top: 4px;
  font-size: 0.8rem;
  color: var(--cyan);
}

.page-about .caps__item h3 {
  grid-column: 2;
  margin: 0;
  font-size: 1.05rem;
  font-weight: 600;
}

.page-about .caps__item p {
  grid-column: 2;
  margin: 0;
  color: var(--text-2);
  font-size: 0.94rem;
  line-height: 1.74;
  max-width: 36rem;
}

.page-about .about-more {
  margin: 26px 0 0;
  color: var(--text-2);
  font-size: 0.95rem;
  line-height: 1.76;
}

.page-about .about-more a,
.page-about .about-upkeep__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
  transition: border-color 150ms var(--ease), color 150ms var(--ease);
}

.page-about .about-more a:hover,
.page-about .about-upkeep__note a:hover {
  color: var(--text);
  border-color: var(--cyan);
}

/* ---------- 维护节奏 ---------- */
.page-about .about-upkeep__grid {
  margin-top: 28px;
  display: grid;
  gap: 26px;
}

.page-about .about-upkeep__text p {
  margin: 0;
  color: var(--text-2);
  font-size: 0.97rem;
  line-height: 1.78;
  max-width: 36rem;
}

.page-about .about-upkeep__list {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  border-left: 2px solid var(--line-cyan);
}

.page-about .about-upkeep__list li {
  padding: 7px 0 7px 16px;
  color: var(--text-2);
  font-size: 0.94rem;
  line-height: 1.7;
  border-bottom: 1px solid rgba(36, 52, 73, 0.7);
}

.page-about .about-upkeep__list li:last-child {
  border-bottom: none;
}

.page-about .about-upkeep__fig {
  margin: 0;
  align-self: start;
  background: var(--paper);
  border: 2px solid var(--paper-ink);
  box-shadow: var(--shadow-paper);
  padding: 10px;
}

.page-about .about-upkeep__fig img {
  border: 1px solid rgba(22, 32, 46, 0.24);
}

.page-about .about-upkeep__fig .img-frame__caption {
  color: var(--paper-ink);
  opacity: 0.72;
  margin-top: 8px;
}

.page-about .about-upkeep__note {
  margin: 26px 0 0;
  padding-top: 18px;
  border-top: 1px dashed var(--about-dash);
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.74;
}

/* ---------- 对接方式 ---------- */
.page-about .about-partner__panel {
  margin-top: 28px;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-partner__main,
.page-about .about-partner__side {
  background: var(--ink-2);
  padding: 24px 20px 26px;
}

.page-about .about-partner__main p {
  margin: 0 0 14px;
  color: var(--text-2);
  font-size: 0.96rem;
  line-height: 1.78;
  max-width: 38rem;
}

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

.page-about .about-partner__side-label {
  margin: 0 0 14px;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--amber);
}

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

.page-about .about-partner__channels li {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 12px;
  align-items: baseline;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-partner__channels span {
  min-width: 44px;
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .about-partner__channels a {
  color: var(--text);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  border-bottom: 1px solid transparent;
  transition: color 150ms var(--ease), border-color 150ms var(--ease);
}

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

.page-about .about-partner__hint {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.7;
}

/* ---------- 断点 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero__frame {
    padding: 60px 40px 50px;
  }

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

  .page-about .about-partner__panel {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  }

  .page-about .team__row {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    gap: 32px;
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__frame {
    padding: 72px 56px 56px;
  }

  .page-about .about-hero__fig {
    margin-top: 22px;
  }

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

  .page-about .who__card:nth-child(2),
  .page-about .who__card:nth-child(4) {
    transform: translateY(30px);
  }

  .page-about .who {
    padding-bottom: 30px;
  }

  .page-about .about-team__fig {
    max-width: 720px;
    margin-left: auto;
  }

  .page-about .caps {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 40px;
  }

  .page-about .about-upkeep__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .tl__text {
    font-size: 1rem;
  }
}

@media (min-width: 1024px) and (hover: hover) {
  .page-about .tl__item {
    cursor: default;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__node,
  .page-about .who__card,
  .page-about .fold,
  .page-about .about-index__list a {
    transition: none;
  }

  .page-about .who__card:nth-child(2),
  .page-about .who__card:nth-child(4) {
    transform: none;
  }
}
<<<END>>>