.page-about {
  --about-gap: 56px;
  --about-rail-w: 300px;
  background: var(--abyss-950);
  color: var(--mist-50);
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background:
    radial-gradient(120% 90% at 82% 8%, rgba(43, 227, 208, 0.16) 0%, rgba(43, 227, 208, 0) 58%),
    linear-gradient(180deg, var(--abyss-800) 0%, var(--abyss-950) 100%);
  border-bottom: 1px solid var(--line-500);
  overflow: hidden;
}

.page-about .about-hero__inner {
  padding-top: 40px;
  padding-bottom: 48px;
}

.page-about .breadcrumb ol {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: var(--mist-300);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--neutral-500);
}

.page-about .breadcrumb a {
  color: var(--mist-300);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--cyan-400);
  border-bottom-color: var(--cyan-400);
}

.page-about .eyebrow {
  margin: 0 0 14px;
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan-400);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-size: clamp(30px, 7.4vw, 62px);
  line-height: 1.14;
  font-weight: 800;
  letter-spacing: -0.01em;
  max-width: 18ch;
}

.page-about .about-hero__lead {
  margin: 0 0 32px;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist-300);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0 0 32px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  border-top: 1px solid var(--line-500);
  padding-top: 24px;
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 13px;
  color: var(--mist-300);
}

.page-about .about-hero__num {
  font-family: var(--font-display);
  font-size: clamp(30px, 8vw, 46px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--mist-50);
}

.page-about .about-hero__facts li:last-child .about-hero__num {
  color: var(--flare-500);
}

.page-about .about-hero__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  line-height: 0;
}

.page-about .about-hero__media img {
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
  filter: saturate(0.92) contrast(1.04);
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(4, 16, 31, 0.55) 0%, rgba(4, 16, 31, 0) 45%, rgba(4, 16, 31, 0.92) 100%);
  pointer-events: none;
}

/* ---------- 主布局：左时间轴 + 右正文 ---------- */
.page-about .about-layout {
  display: block;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 20px;
}

.page-about .about-rail {
  padding: 32px 0 8px;
}

.page-about .about-rail__label {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--neutral-500);
}

.page-about .about-timeline {
  list-style: none;
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 0 0 12px;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-timeline li {
  flex: 0 0 auto;
}

.page-about .about-timeline__node {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: var(--r-pill);
  background: var(--abyss-800);
  border: 1px solid var(--line-500);
  color: var(--mist-300);
  text-decoration: none;
  white-space: nowrap;
  font-size: 14px;
  min-height: 44px;
  transition: background 180ms ease, color 180ms ease, border-color 180ms ease;
}

.page-about .about-timeline__node:hover,
.page-about .about-timeline__node:focus-visible {
  border-color: var(--cyan-400);
  color: var(--mist-50);
}

.page-about .about-timeline__node.is-active {
  background: var(--cyan-400);
  border-color: var(--cyan-400);
  color: var(--abyss-950);
  font-weight: 700;
}

.page-about .about-timeline__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan-400);
  flex: 0 0 auto;
}

.page-about .about-timeline__node.is-active .about-timeline__dot {
  background: var(--abyss-950);
}

.page-about .about-timeline__season {
  font-size: 11px;
  letter-spacing: 0.08em;
  opacity: 0.75;
}

.page-about .about-timeline__name {
  font-weight: 600;
}

/* ---------- 章节 ---------- */
.page-about .about-body {
  padding: 8px 0 72px;
}

.page-about .about-section {
  padding: 44px 0;
  scroll-margin-top: 88px;
}

.page-about .about-section--alt {
  position: relative;
}

.page-about .about-section--alt::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 100vw;
  transform: translateX(-50%);
  background: var(--abyss-800);
  z-index: -1;
}

.page-about .about-section__head h2 {
  margin: 0 0 24px;
  font-size: clamp(24px, 5.6vw, 40px);
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -0.01em;
  max-width: 22ch;
}

.page-about .about-section__note {
  margin: 28px 0 0;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist-300);
}

.page-about .about-link {
  color: var(--cyan-400);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 1px solid rgba(43, 227, 208, 0.4);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  border-bottom-color: var(--cyan-400);
}

/* 三种内容形态 */
.page-about .about-offer {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line-500);
}

.page-about .about-offer__item {
  padding: 26px 0 24px;
  border-bottom: 1px solid var(--line-500);
}

.page-about .about-offer__index {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 900;
  letter-spacing: 0.04em;
  color: var(--cyan-700);
}

.page-about .about-offer__item h3 {
  margin: 0 0 10px;
  font-size: 20px;
  font-weight: 700;
}

.page-about .about-offer__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist-300);
}

/* 演进章节 */
.page-about .about-chapters {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-chapters::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan-400) 0%, var(--line-500) 100%);
}

.page-about .about-chapters__item {
  position: relative;
  padding: 0 0 30px 30px;
}

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

.page-about .about-chapters__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--abyss-950);
  border: 2px solid var(--cyan-400);
  box-sizing: border-box;
}

.page-about .about-chapters__tag {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 900;
  letter-spacing: 0.1em;
  color: var(--flare-500);
}

.page-about .about-chapters__item h3 {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 700;
}

.page-about .about-chapters__item p {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist-300);
}

/* SVG 折线 */
.page-about .about-growth {
  margin-top: 36px;
  padding: 22px 20px 18px;
  background: var(--abyss-600);
  border-radius: var(--r-lg);
}

.page-about .about-growth__caption {
  margin: 0 0 12px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--mist-300);
}

.page-about .about-growth__chart {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-growth__axis {
  list-style: none;
  display: flex;
  justify-content: space-between;
  gap: 6px;
  margin: 12px 0 0;
  padding: 0;
  font-size: 11px;
  color: var(--mist-300);
  letter-spacing: 0.04em;
}

.page-about .about-growth__axis li {
  flex: 1 1 0;
  min-width: 0;
  text-align: center;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.page-about .about-growth__axis li:last-child {
  color: var(--flare-300);
  font-weight: 700;
}

/* 使用场景 */
.page-about .about-uses {
  display: grid;
  gap: 0;
}

.page-about .about-uses__row {
  display: grid;
  gap: 6px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line-500);
}

.page-about .about-uses__row:first-child {
  border-top: 1px solid var(--line-500);
}

.page-about .about-uses__title {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  color: var(--cyan-400);
}

.page-about .about-uses__desc {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist-300);
}

/* 全宽数据条 */
.page-about .about-bar {
  background: linear-gradient(90deg, var(--cyan-700) 0%, var(--abyss-600) 62%, var(--abyss-800) 100%);
  margin: 8px 0;
}

.page-about .about-bar__track {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 24px 20px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 16px;
}

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

.page-about .about-bar__num {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(32px, 9vw, 48px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--mist-50);
}

.page-about .about-bar__label {
  margin: 6px 0 0;
  font-size: 13px;
  color: rgba(244, 249, 255, 0.82);
}

/* 团队 */
.page-about .about-team {
  display: grid;
  gap: 28px;
}

.page-about .about-team__group {
  padding: 20px 0;
  border-top: 1px solid var(--line-500);
}

.page-about .about-team__group:last-of-type {
  border-bottom: 1px solid var(--line-500);
}

.page-about .about-team__group h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
}

.page-about .about-team__group p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist-300);
}

.page-about .about-team__note {
  margin: 22px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist-50);
  border-left: 3px solid var(--cyan-400);
  padding-left: 16px;
}

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

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--r-lg);
}

.page-about .about-team__figure figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist-300);
}

/* 可信度 */
.page-about .about-reliable__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-reliable__steps li {
  background: var(--abyss-600);
  border-radius: var(--r-md);
  padding: 22px 20px;
}

.page-about .about-reliable__step {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 0.14em;
  color: var(--cyan-400);
}

.page-about .about-reliable__steps h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
}

.page-about .about-reliable__steps p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--mist-300);
}

.page-about .about-reliable__note {
  margin: 22px 0 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist-300);
}

/* 合作 */
.page-about .about-coop {
  display: grid;
  gap: 26px;
}

.page-about .about-coop__text h2 {
  margin: 0 0 20px;
  font-size: clamp(24px, 5.6vw, 40px);
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -0.01em;
  max-width: 22ch;
}

.page-about .about-coop__text p {
  margin: 0 0 16px;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist-300);
}

.page-about .about-coop__list {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-coop__list li {
  padding: 8px 16px;
  border-radius: var(--r-pill);
  background: var(--abyss-600);
  border: 1px solid var(--line-500);
  font-size: 13px;
  color: var(--mist-50);
}

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

.page-about .about-coop__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--r-lg);
}

/* 里程碑 */
.page-about .about-milestones {
  display: grid;
  gap: 22px;
}

.page-about .about-milestones__item {
  padding: 24px 22px;
  border-radius: var(--r-lg);
  background: linear-gradient(150deg, var(--abyss-600) 0%, var(--abyss-800) 100%);
}

.page-about .about-milestones__num {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(44px, 12vw, 66px);
  font-weight: 900;
  line-height: 0.96;
  letter-spacing: -0.03em;
  color: var(--mist-50);
}

.page-about .about-milestones__num span {
  font-size: 0.42em;
  margin-left: 4px;
  color: var(--cyan-400);
  letter-spacing: 0;
}

.page-about .about-milestones__item h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
}

.page-about .about-milestones__item p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--mist-300);
}

.page-about .about-milestones__cta {
  margin-top: 32px;
  padding-top: 26px;
  border-top: 1px solid var(--line-500);
  display: grid;
  gap: 16px;
}

.page-about .about-milestones__cta p {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist-300);
}

.page-about .about-milestones__buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* 聚焦环 */
.page-about a:focus-visible,
.page-about .about-timeline__node:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 3px;
  border-radius: var(--r-sm);
}

/* ---------- 响应式 ---------- */
@media (min-width: 768px) {
  .page-about .about-hero__inner {
    padding-top: 56px;
    padding-bottom: 64px;
  }

  .page-about .about-hero__facts {
    gap: 28px;
  }

  .page-about .about-layout {
    padding: 0 32px;
  }

  .page-about .about-offer__item {
    display: grid;
    grid-template-columns: 64px minmax(0, 1fr);
    align-items: start;
    column-gap: 20px;
    padding: 30px 0;
  }

  .page-about .about-offer__index {
    grid-row: 1 / span 2;
    margin: 4px 0 0;
    font-size: 26px;
  }

  .page-about .about-offer__item h3,
  .page-about .about-offer__text {
    grid-column: 2;
  }

  .page-about .about-uses__row {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }

  .page-about .about-bar__track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    padding: 30px 32px;
    gap: 24px;
  }

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

  .page-about .about-milestones {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .about-milestones__cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 24px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    display: grid;
    grid-template-columns: minmax(240px, 3fr) minmax(0, 7fr);
    column-gap: 64px;
    padding: 0 40px;
  }

  .page-about .about-rail {
    padding: 72px 0 72px;
  }

  .page-about .about-rail__label {
    margin-bottom: 22px;
  }

  .page-about .about-timeline {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
    border-left: 1px solid var(--line-500);
    position: sticky;
    top: 96px;
  }

  .page-about .about-timeline li {
    flex: 1 1 auto;
  }

  .page-about .about-timeline__node {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 2px;
    padding: 14px 0 14px 22px;
    border: 0;
    border-radius: 0;
    background: transparent;
    white-space: normal;
    min-height: 0;
  }

  .page-about .about-timeline__node:hover,
  .page-about .about-timeline__node:focus-visible {
    background: transparent;
    color: var(--mist-50);
  }

  .page-about .about-timeline__node.is-active {
    background: transparent;
    color: var(--mist-50);
  }

  .page-about .about-timeline__dot {
    position: absolute;
    left: -5px;
    top: 20px;
    width: 10px;
    height: 10px;
    background: var(--line-500);
    transition: background 180ms ease, transform 180ms ease;
  }

  .page-about .about-timeline__node.is-active .about-timeline__dot {
    background: var(--cyan-400);
    transform: scale(1.35);
    box-shadow: 0 0 0 4px rgba(43, 227, 208, 0.18);
  }

  .page-about .about-timeline__season {
    font-size: 11.5px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--neutral-500);
    opacity: 1;
  }

  .page-about .about-timeline__node.is-active .about-timeline__season {
    color: var(--cyan-400);
  }

  .page-about .about-timeline__name {
    font-size: 16px;
    color: var(--mist-300);
  }

  .page-about .about-timeline__node.is-active .about-timeline__name {
    color: var(--mist-50);
    font-weight: 700;
  }

  .page-about .about-body {
    padding: 0 0 96px;
  }

  .page-about .about-section {
    padding: 64px 0;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-coop {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-growth {
    padding: 28px 32px 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}
<<<PAGE_CSS_END>>>
</main>