.page-about {
  --about-rail: 168px;
  --about-gap: clamp(1.5rem, 3.6vw, 3.25rem);
  --about-edge: clamp(1rem, 3vw, 2.25rem);
  padding-bottom: clamp(3rem, 7vw, 5.5rem);
  overflow-x: clip;
}

.page-about .breadcrumb {
  padding-top: clamp(0.9rem, 2.4vw, 1.5rem);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--grid-line);
  background:
    radial-gradient(120% 100% at 88% -10%, rgba(25, 245, 198, 0.15), transparent 58%),
    radial-gradient(90% 80% at 6% 112%, rgba(245, 214, 75, 0.08), transparent 62%),
    linear-gradient(180deg, var(--ink-800), var(--ink-900));
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
  opacity: 0.4;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.6rem, 4vw, 3rem);
  padding: clamp(1.4rem, 3.6vw, 3rem) 0 clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 6.2vw, 4rem);
  line-height: 1.04;
  letter-spacing: 0.01em;
  color: var(--white);
  margin: 0.65rem 0 0;
  max-width: 20ch;
}

.page-about .about-hero__intro {
  margin: 1.1rem 0 0;
  max-width: 56ch;
  font-size: clamp(0.95rem, 2.2vw, 1.0625rem);
  line-height: 1.78;
  color: var(--white);
  opacity: 0.85;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1.5rem;
}

.page-about .about-hero__reads {
  align-self: end;
  padding: 1rem;
  border: 1px solid var(--grid-line);
  border-radius: var(--radius);
  background: linear-gradient(150deg, rgba(12, 42, 32, 0.9), rgba(4, 17, 12, 0.75));
}

.page-about .reads-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 0.75rem;
  background: var(--grid-line);
  border-radius: calc(var(--radius) - 6px);
  overflow: hidden;
}

.page-about .read {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 0.85rem 0.85rem 0.95rem;
  background: var(--ink-800);
  min-width: 0;
}

.page-about .read__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.35rem, 4.4vw, 1.9rem);
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .read__label {
  font-size: 0.75rem;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 分栏骨架 ---------- */
.page-about .about-spread {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  padding-top: clamp(1.75rem, 4.5vw, 3rem);
}

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

.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: clamp(2.5rem, 6vw, 4.5rem);
  min-width: 0;
}

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

.page-about .sec-head {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding-bottom: 0.9rem;
  border-bottom: 1px solid var(--grid-line);
  margin-bottom: clamp(1.1rem, 2.6vw, 1.75rem);
}

.page-about .sec-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3.5vw, 2.1rem);
  line-height: 1.18;
  letter-spacing: 0.01em;
  color: var(--white);
  margin: 0;
  max-width: 26ch;
}

.page-about .body-text {
  margin: 0 0 0.95rem;
  font-size: clamp(0.9375rem, 2vw, 1rem);
  line-height: 1.78;
  color: var(--white);
  opacity: 0.84;
  word-break: break-word;
}

.page-about .sec-lede {
  max-width: 62ch;
  margin-bottom: clamp(1.1rem, 2.8vw, 1.75rem);
}

/* ---------- 起点 ---------- */
.page-about .origin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.25rem, 3vw, 2.25rem);
  align-items: start;
}

.page-about .origin-figure {
  margin: 0;
  border-radius: 26px 8px 26px 8px;
  overflow: hidden;
  border: 1px solid var(--grid-line);
}

.page-about .origin-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.85);
}

.page-about .tick-list {
  list-style: none;
  margin: 1.15rem 0 0;
  padding: 0;
}

.page-about .tick-list li {
  position: relative;
  padding: 0.6rem 0 0.6rem 1.6rem;
  border-top: 1px solid var(--grid-line);
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--white);
  opacity: 0.8;
}

.page-about .tick-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.05rem;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--yellow);
}

/* ---------- 三条能力线 ---------- */
.page-about .lines-wrap {
  display: flex;
  flex-direction: column;
  gap: clamp(1.25rem, 3vw, 2rem);
}

.page-about .lines-svg {
  display: block;
  width: 100%;
  height: auto;
  max-height: 220px;
  opacity: 0.95;
}

.page-about .lines-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.page-about .lines-item {
  padding: 1rem 0 0;
  border-top: 1px solid var(--grid-line);
  min-width: 0;
}

.page-about .lines-item__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .lines-item h3 {
  font-family: var(--font-display);
  font-size: clamp(1.0625rem, 2.6vw, 1.25rem);
  letter-spacing: 0.03em;
  color: var(--white);
  margin: 0.35rem 0 0.55rem;
}

.page-about .lines-item--a {
  border-top-color: var(--cyan);
}

.page-about .lines-item--b {
  border-top-color: var(--yellow);
}

.page-about .lines-item--c {
  border-top-color: var(--orange);
}

.page-about .lines-item .body-text {
  margin-bottom: 0;
  font-size: 0.9375rem;
}

/* ---------- 年份刻度 ---------- */
.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: tl;
}

.page-about .tl__item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.4rem;
  padding: clamp(1.1rem, 2.8vw, 1.6rem) 0 clamp(1.1rem, 2.8vw, 1.6rem) 1.5rem;
  border-top: 1px solid var(--grid-line);
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: calc(clamp(1.1rem, 2.8vw, 1.6rem) + 0.5rem);
  width: 8px;
  height: 8px;
  background: var(--grid-line);
  transition: background 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .tl__item:hover::before,
.page-about .tl__item:focus-within::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(25, 245, 198, 0.15);
}

.page-about .tl__year {
  display: none;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  line-height: 0.88;
  letter-spacing: -0.02em;
  color: rgba(234, 247, 241, 0.05);
  -webkit-text-stroke: 1px var(--muted);
  font-variant-numeric: tabular-nums;
  transition: -webkit-text-stroke-color 0.3s var(--ease), color 0.3s var(--ease);
}

.page-about .tl__item:hover .tl__year {
  -webkit-text-stroke-color: var(--cyan);
  color: rgba(25, 245, 198, 0.08);
}

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

.page-about .tl__body h3 {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  font-family: var(--font-display);
  font-size: clamp(1.0625rem, 2.6vw, 1.3rem);
  letter-spacing: 0.02em;
  color: var(--white);
  margin: 0 0 0.45rem;
}

.page-about .tl__year-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--yellow);
}

.page-about .tl__body .body-text {
  margin-bottom: 0;
  max-width: 60ch;
  font-size: 0.9375rem;
}

/* ---------- 团队 ---------- */
.page-about .team {
  position: relative;
  overflow: hidden;
  padding: clamp(1.25rem, 4vw, 2.5rem);
  border: 1px solid var(--grid-line);
  border-radius: 72px 16px 72px 16px;
  background: linear-gradient(155deg, var(--ink-700), var(--ink-800) 62%, var(--ink-900));
}

.page-about .team::before {
  content: "";
  position: absolute;
  right: -80px;
  top: -70px;
  width: 240px;
  height: 240px;
  border: 1px solid var(--grid-line);
  border-radius: 50%;
  opacity: 0.7;
  pointer-events: none;
}

.page-about .team::after {
  content: "";
  position: absolute;
  left: -60px;
  bottom: -90px;
  width: 220px;
  height: 220px;
  border: 1px solid rgba(25, 245, 198, 0.18);
  border-radius: 50%;
  pointer-events: none;
}

.page-about .team__intro,
.page-about .team__roles {
  position: relative;
  z-index: 1;
}

.page-about .team__figure {
  margin: 1rem 0 0;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--grid-line);
}

.page-about .team__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.85);
}

.page-about .team__roles {
  margin-top: 1.25rem;
}

.page-about .team__role {
  border-top: 1px solid var(--grid-line);
}

.page-about .team__role summary {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.85rem 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: clamp(1rem, 2.4vw, 1.125rem);
  letter-spacing: 0.02em;
  color: var(--white);
}

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

.page-about .team__role summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--cyan);
}

.page-about .team__role[open] summary::after {
  content: "−";
}

.page-about .team__role-num {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--yellow);
  letter-spacing: 0.08em;
}

.page-about .team__role .body-text {
  padding-bottom: 0.9rem;
  margin-bottom: 0;
  font-size: 0.9375rem;
  max-width: 58ch;
}

/* ---------- 合作与巡检 ---------- */
.page-about .table-wrap {
  overflow-x: auto;
  border: 1px solid var(--grid-line);
  border-radius: var(--radius);
  background: var(--ink-800);
  -webkit-overflow-scrolling: touch;
}

.page-about .partner-table {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.page-about .partner-table thead th {
  position: sticky;
  top: 0;
  z-index: 2;
  background: var(--ink-700);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  font-weight: 500;
  text-align: left;
  padding: 0.75rem 0.9rem;
  border-bottom: 1px solid var(--grid-line);
  white-space: nowrap;
}

.page-about .partner-table tbody th {
  text-align: left;
  padding: 0.9rem;
  color: var(--white);
  font-weight: 500;
  white-space: nowrap;
  border-bottom: 1px solid var(--grid-line);
}

.page-about .partner-table tbody td {
  padding: 0.9rem;
  color: var(--white);
  opacity: 0.78;
  line-height: 1.55;
  border-bottom: 1px solid var(--grid-line);
}

.page-about .partner-table tbody tr:nth-child(even) {
  background: rgba(34, 72, 58, 0.28);
}

.page-about .partner-table tbody tr:last-child th,
.page-about .partner-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .visually-hidden-text {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.page-about .checks {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: 1.25rem;
}

.page-about .check {
  padding: 1rem;
  border-left: 2px solid var(--grid-line);
  background: rgba(12, 42, 32, 0.5);
  border-radius: 0 10px 10px 0;
  min-width: 0;
}

.page-about .check .body-text {
  margin: 0.55rem 0 0;
  font-size: 0.9rem;
}

/* ---------- 服务范围 ---------- */
.page-about .reach-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.25rem, 3vw, 2.25rem);
  align-items: start;
}

.page-about .reach-figure {
  margin: 0;
  border-radius: 8px 26px 8px 26px;
  overflow: hidden;
  border: 1px solid var(--grid-line);
}

.page-about .reach-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .link-list {
  list-style: none;
  margin: 1.25rem 0 0;
  padding: 0;
}

.page-about .link-list li {
  border-top: 1px solid var(--grid-line);
}

.page-about .link-list a {
  display: block;
  padding: 0.8rem 0 0.8rem 1.35rem;
  position: relative;
  font-size: 0.9375rem;
  color: var(--cyan);
  text-decoration: none;
  transition: color 0.25s var(--ease), padding-left 0.25s var(--ease);
}

.page-about .link-list a::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--muted);
  transition: transform 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .link-list a:hover,
.page-about .link-list a:focus-visible {
  color: var(--white);
  padding-left: 1.6rem;
}

.page-about .link-list a:hover::before,
.page-about .link-list a:focus-visible::before {
  color: var(--orange);
  transform: translateX(3px);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  border-top: 1px solid var(--grid-line);
  padding-top: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-cta__inner {
  position: relative;
  padding: clamp(1.35rem, 4vw, 2.75rem);
  border-radius: var(--radius);
  border: 1px solid var(--grid-line);
  background:
    radial-gradient(120% 130% at 100% 0%, rgba(25, 245, 198, 0.14), transparent 60%),
    linear-gradient(160deg, var(--ink-700), var(--ink-900));
  overflow: hidden;
}

.page-about .about-cta__inner h2 {
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3.6vw, 2rem);
  line-height: 1.2;
  color: var(--white);
  margin: 0.5rem 0 0.75rem;
  max-width: 24ch;
}

.page-about .about-cta__inner .body-text {
  max-width: 52ch;
  margin-bottom: 0;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1.25rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .lines-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
  }

  .page-about .lines-item {
    padding-top: 1.1rem;
  }

  .page-about .lines-item--b {
    margin-top: 1.25rem;
  }

  .page-about .lines-item--c {
    margin-top: 0.55rem;
  }

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

@media (min-width: 820px) {
  .page-about .origin-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }

  .page-about .reach-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.82fr);
    align-items: start;
  }

  .page-about .tl__item {
    grid-template-columns: 118px minmax(0, 1fr);
    gap: 1.25rem;
    padding-left: 1.75rem;
  }

  .page-about .tl__year {
    display: block;
  }

  .page-about .tl__year-tag {
    display: none;
  }

  .page-about .tl__body h3 {
    font-size: clamp(1.15rem, 2vw, 1.35rem);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.42fr) minmax(0, 0.58fr);
    align-items: end;
  }
}

@media (min-width: 960px) {
  .page-about .about-spread {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 1.5rem);
    align-self: start;
  }

  .page-about .section-index__list {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__item::before,
  .page-about .tl__year,
  .page-about .link-list a,
  .page-about .link-list a::before {
    transition: none;
  }
}
<<<PAGE_CSS_END>>>