.page-about {
  --about-index: 56px;
  --about-note: 200px;
  --about-rail: 184px;
  position: relative;
  display: block;
  color: var(--text);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about section[id] {
  scroll-margin-top: calc(var(--header-h, 76px) + 20px);
}

.page-about .breadcrumb {
  margin: clamp(16px, 2.4vw, 26px) 0 clamp(8px, 1.4vw, 16px);
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--text-dim);
}

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

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

.page-about .breadcrumb li[aria-current="page"] {
  color: var(--text-strong);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-bottom: clamp(28px, 4.4vw, 52px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -16%;
  right: -14%;
  width: min(620px, 78vw);
  height: min(460px, 58vw);
  background: linear-gradient(135deg, rgba(23, 195, 230, .16), rgba(30, 79, 216, .05) 68%);
  clip-path: polygon(16% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-about .about-hero__eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__eyebrow::before {
  content: "";
  display: block;
  width: 24px;
  height: 2px;
  background: var(--grad-cool);
}

.page-about .about-hero h1 {
  margin: 0 0 16px;
  font-size: clamp(29px, 5.4vw, 52px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--text-strong);
  max-width: 17em;
}

.page-about .about-hero__lede {
  margin: 0;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.82;
  color: var(--text);
  max-width: 34em;
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: clamp(18px, 3.4vw, 40px);
}

.page-about .about-hero__stats li {
  display: grid;
  gap: 3px;
}

.page-about .about-hero__stat-num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-strong);
}

.page-about .about-hero__stat-lab {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--text-dim);
}

.page-about .about-note {
  margin: 0;
  font-size: 12px;
  line-height: 1.9;
  letter-spacing: .06em;
  color: var(--text-dim);
  border-left: 2px solid var(--line);
  padding-left: 12px;
}

.page-about .about-hero__band {
  margin-top: clamp(24px, 3.6vw, 46px);
  clip-path: polygon(0 0, 100% 5%, 100% 100%, 0 95%);
  background: var(--panel);
}

.page-about .about-hero__band img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* ---------- 主体框架 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 40px);
  padding-top: clamp(22px, 3.6vw, 48px);
}

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

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

.page-about .about-rail__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--text-dim);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border-left: 1px solid var(--line);
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 0 7px 12px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-dim);
  text-decoration: none;
  border-left: 2px solid transparent;
  margin-left: -1px;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--text-strong);
  border-left-color: var(--cyan);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--cyan);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  padding: clamp(26px, 3.6vw, 42px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-chapter__index {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .about-chapter__num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .about-chapter__rule {
  flex: 1 1 auto;
  max-width: 110px;
  height: 1px;
  background: linear-gradient(90deg, var(--line), transparent);
}

.page-about .about-chapter__title {
  margin: 0 0 14px;
  font-size: clamp(21px, 2.6vw, 29px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  font-weight: 700;
  color: var(--text-strong);
}

.page-about .about-chapter__lede {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.82;
  color: var(--text);
  max-width: 42em;
}

.page-about .about-chapter__note {
  margin-top: 2px;
}

/* ---------- 四类需求 ---------- */
.page-about .about-pillars {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
  clip-path: var(--cut-path);
  overflow: hidden;
}

.page-about .about-pillars li {
  background: var(--panel);
  padding: 14px 16px;
  display: grid;
  gap: 5px;
}

.page-about .about-pillars__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-about .about-pillars__val {
  font-size: 15px;
  line-height: 1.78;
  color: var(--text);
}

/* ---------- 区域与人群 ---------- */
.page-about .about-region {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-about .about-audience {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-audience__item {
  border-left: 2px solid var(--line);
  padding-left: 14px;
}

.page-about .about-audience__item:nth-child(1) {
  border-left-color: var(--cyan);
}

.page-about .about-audience__item:nth-child(2) {
  border-left-color: var(--gold);
}

.page-about .about-audience__item:nth-child(3) {
  border-left-color: var(--red);
}

.page-about .about-audience__item:nth-child(4) {
  border-left-color: var(--orange);
}

.page-about .about-audience__title {
  display: block;
  margin-bottom: 5px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-strong);
}

.page-about .about-audience__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-region__figure {
  margin: 0;
  padding: 10px;
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: var(--cut-path);
}

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

/* ---------- 版本时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-tl {
  position: relative;
  padding: 0 0 26px 30px;
  border-left: 1px solid var(--line);
}

.page-about .about-tl:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 4px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(23, 195, 230, .1);
}

.page-about .about-tl__ver {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--cyan);
  margin-bottom: 6px;
}

.page-about .about-tl__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-strong);
}

.page-about .about-tl__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.82;
  color: var(--text-dim);
}

.page-about .about-timeline-figure {
  margin: 0;
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: var(--cut-path);
  overflow: hidden;
}

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

/* ---------- 三支团队 ---------- */
.page-about .about-teams {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-team {
  position: relative;
  padding: 20px 18px 22px;
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: var(--cut-path);
}

.page-about .about-team::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 46px;
  height: 2px;
  background: var(--grad-cool);
}

.page-about .about-team__tag {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--text-dim);
}

.page-about .about-team h3 {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--text-strong);
}

.page-about .about-team p {
  margin: 0;
  font-size: 14px;
  line-height: 1.82;
  color: var(--text-dim);
}

/* ---------- 服务标准 ---------- */
.page-about .about-spec {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-spec__row {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-spec__term {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--text-strong);
}

.page-about .about-spec__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
}

/* ---------- 内容更新 ---------- */
.page-about .about-updates {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-update {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 14px 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: var(--cut-path-sm);
}

.page-about .about-update__cat {
  padding-top: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  white-space: nowrap;
  color: var(--gold);
}

.page-about .about-update p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--text-dim);
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  margin-top: clamp(34px, 5vw, 62px);
  padding: clamp(22px, 3vw, 34px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  background: linear-gradient(120deg, rgba(225, 29, 46, .12), rgba(23, 195, 230, .07) 70%);
  border: 1px solid var(--line);
  border-left: 3px solid var(--red);
  clip-path: var(--cut-path);
}

.page-about .about-cta h2 {
  margin: 0 0 8px;
  font-size: clamp(19px, 2.2vw, 24px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-strong);
}

.page-about .about-cta p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
  max-width: 40em;
}

.page-about .about-cta .btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-audience {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 28px;
  }

  .page-about .about-teams {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-updates {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .about-spec__row {
    grid-template-columns: 168px minmax(0, 1fr);
    align-items: baseline;
    gap: 20px;
    padding: 16px 0;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 28px;
  }
}

@media (min-width: 820px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, .82fr);
    align-items: end;
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-hero__note {
    align-self: end;
  }

  .page-about .about-region {
    grid-template-columns: minmax(0, 1fr) minmax(0, .8fr);
    align-items: center;
    gap: 30px;
  }

  .page-about .about-timeline {
    position: relative;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px;
    margin-bottom: 30px;
  }

  .page-about .about-timeline::after {
    content: "";
    position: absolute;
    top: 11px;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--cyan), var(--blue));
    opacity: .55;
  }

  .page-about .about-tl {
    padding: 32px 0 0;
    border-left: 0;
  }

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

  .page-about .about-tl::before {
    left: 0;
    top: 5px;
  }
}

@media (min-width: 900px) {
  .page-about .about-chapter {
    grid-template-columns: var(--about-index) minmax(0, 1fr) var(--about-note);
    gap: 28px;
    padding: clamp(30px, 3.6vw, 46px) 0;
  }

  .page-about .about-chapter:first-child {
    padding-top: 0;
  }

  .page-about .about-chapter__index {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .page-about .about-chapter__rule {
    flex: 0 0 auto;
    width: 1px;
    max-width: none;
    height: 46px;
    background: linear-gradient(180deg, var(--line), transparent);
  }

  .page-about .about-chapter__note {
    margin-top: 8px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 60px);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: calc(var(--header-h, 76px) + 28px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link {
    transition: none;
  }
}
</final>
</PAGE_CSS>