.page-about {
  --about-cut: linear-gradient(126deg, transparent 0 44%, rgba(36, 214, 232, 0.09) 44% 56%, transparent 56%);
  --about-mesh: repeating-linear-gradient(90deg, rgba(155, 234, 242, 0.06) 0 1px, transparent 1px 72px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--abyss);
  color: var(--white);
  padding: 28px 0 clamp(44px, 7vw, 84px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--about-cut), var(--about-mesh);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 12%;
  right: -6%;
  width: min(420px, 52vw);
  height: min(420px, 52vw);
  background: radial-gradient(circle, rgba(36, 214, 232, 0.22), transparent 68%);
  pointer-events: none;
}

.page-about .about-hero .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__crumb ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 clamp(24px, 4vw, 44px);
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--steel);
}

.page-about .about-hero__crumb li::after {
  content: "/";
  margin-left: 8px;
  color: var(--steel);
}

.page-about .about-hero__crumb li:last-child::after {
  content: "";
}

.page-about .about-hero__crumb a {
  color: var(--cyan-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
}

.page-about .eyebrow {
  margin: 0 0 14px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(38px, 8vw, 88px);
  line-height: 0.98;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-hero__lede {
  margin: 0 0 24px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--cyan-soft);
  max-width: 46ch;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(96px, 1fr));
  gap: 1px;
  margin: 0 0 28px;
  padding: 0;
  list-style: none;
  background: var(--line);
  border-top: 1px solid var(--line-strong);
}

.page-about .about-hero__stats li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 10px;
  background: rgba(6, 24, 38, 0.86);
}

.page-about .about-hero__num {
  font-size: 24px;
  font-weight: 500;
  line-height: 1.1;
  color: var(--amber);
}

.page-about .about-hero__unit {
  font-size: 13px;
  margin-left: 2px;
}

.page-about .about-hero__label {
  font-size: 12px;
  color: var(--steel);
}

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

/* ---------- 主体两栏 ---------- */
.page-about .about-main {
  background: var(--mist);
  color: var(--ink);
}

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

.page-about .about-rail {
  border-top: 2px solid var(--ink);
  padding-top: 16px;
}

.page-about .about-rail__label {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--steel);
}

.page-about .about-rail__list {
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: rgba(92, 124, 147, 0.22);
}

.page-about .about-rail__list a {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 11px 12px;
  background: var(--mist);
  color: var(--ink);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.4;
  transition: background 0.18s var(--ease), color 0.18s var(--ease);
}

.page-about .about-rail__list a .mono {
  font-size: 12px;
  color: var(--steel);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  background: var(--white);
  color: var(--navy);
}

.page-about .about-rail__stamp {
  padding: 16px;
  background: var(--navy);
  color: var(--cyan-soft);
}

.page-about .about-rail__stamp p {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.65;
}

.page-about .about-flow {
  display: grid;
  gap: clamp(36px, 6vw, 64px);
}

.page-about .about-chapter {
  scroll-margin-top: 96px;
}

.page-about .about-chapter__head {
  display: flex;
  gap: 14px;
  align-items: baseline;
  padding-bottom: 12px;
  margin-bottom: 20px;
  border-bottom: 1px solid rgba(92, 124, 147, 0.3);
}

.page-about .about-chapter__no {
  font-size: 13px;
  color: var(--coral);
  letter-spacing: 0.08em;
}

.page-about .about-chapter__title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(22px, 3.6vw, 32px);
  line-height: 1.35;
  color: var(--ink);
}

.page-about .about-chapter__text {
  margin: 0 0 18px;
  max-width: 72ch;
  font-size: 16px;
  line-height: 1.85;
  color: #22303a;
}

.page-about .about-link {
  color: var(--navy);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan);
  padding-bottom: 1px;
}

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

.page-about .about-note {
  margin-top: 22px;
  padding: 18px 20px;
  border-left: 3px solid var(--cyan);
  background: var(--white);
}

.page-about .about-note--coral {
  border-left-color: var(--coral);
}

.page-about .about-note__title {
  margin: 0 0 6px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--navy);
}

.page-about .about-note p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: #35454f;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 1px;
  margin: 24px 0 26px;
  background: rgba(92, 124, 147, 0.28);
}

.page-about .about-team__role {
  position: relative;
  padding: 20px 18px;
  background: var(--white);
  transition: background 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-team__role::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 3px;
  background: var(--amber);
  transition: width 0.28s var(--ease);
}

.page-about .about-team__role:hover,
.page-about .about-team__role:focus-visible {
  background: #f7fbfd;
  outline: none;
}

.page-about .about-team__role:hover::after,
.page-about .about-team__role:focus-visible::after {
  width: 100%;
}

.page-about .about-team__num {
  margin: 0;
  font-size: 32px;
  font-weight: 500;
  line-height: 1;
  color: var(--amber);
}

.page-about .about-team__name {
  margin: 8px 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  letter-spacing: 0.02em;
  color: var(--abyss);
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: #3a4a55;
}

.page-about .about-figure {
  margin: 0 0 22px;
  background: var(--navy);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-about .about-figure--wide img {
  aspect-ratio: 16 / 10;
}

.page-about .about-figure figcaption {
  padding: 10px 14px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--steel);
  background: var(--mist);
  border-left: 2px solid var(--cyan);
}

/* ---------- 栏目 ---------- */
.page-about .about-channels {
  margin: 22px 0 26px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: rgba(92, 124, 147, 0.28);
}

.page-about .about-channels__item {
  position: relative;
  padding: 18px 18px 18px 20px;
  background: var(--white);
}

.page-about .about-channels__tag {
  display: inline-block;
  margin-bottom: 6px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--coral);
}

.page-about .about-channels__item h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: 0.02em;
  color: var(--abyss);
}

.page-about .about-channels__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: #3a4a55;
}

.page-about .about-channels__link {
  margin-top: 8px !important;
  padding-top: 8px;
  border-top: 1px dashed rgba(92, 124, 147, 0.45);
  color: var(--navy) !important;
  font-size: 13px !important;
}

/* ---------- 流程 ---------- */
.page-about .about-steps {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: rgba(92, 124, 147, 0.28);
  counter-reset: step;
}

.page-about .about-steps li {
  padding: 16px 18px;
  background: var(--white);
}

.page-about .about-steps__no {
  display: block;
  margin-bottom: 4px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--steel);
}

.page-about .about-steps strong {
  display: block;
  margin-bottom: 4px;
  font-size: 15px;
  color: var(--abyss);
}

.page-about .about-steps p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: #3a4a55;
}

/* ---------- 覆盖 ---------- */
.page-about .about-coverage {
  display: grid;
  gap: 18px;
  margin: 22px 0 20px;
}

.page-about .about-coverage__block {
  padding: 20px;
  background: var(--white);
  border-top: 3px solid var(--cyan);
}

.page-about .about-coverage__block:nth-child(2) {
  border-top-color: var(--amber);
}

.page-about .about-coverage__block h3 {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 18px;
  color: var(--abyss);
}

.page-about .about-coverage__block p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: #3a4a55;
}

/* ---------- 里程碑 ---------- */
.page-about .about-timeline {
  background: var(--navy);
  color: var(--white);
  position: relative;
  overflow: hidden;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(180deg, rgba(155, 234, 242, 0.07) 0 1px, transparent 1px 64px);
  pointer-events: none;
}

.page-about .about-timeline .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-timeline__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 4.6vw, 48px);
  line-height: 1.05;
  color: var(--white);
}

.page-about .about-timeline__lede {
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--cyan-soft);
}

.page-about .about-timeline .eyebrow {
  color: var(--amber);
}

.page-about .about-timeline__bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 26px;
}

.page-about .about-timeline__bar .filter-btn {
  padding: 8px 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--cyan-soft);
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: 0;
  cursor: pointer;
  transition: background 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-timeline__bar .filter-btn:hover,
.page-about .about-timeline__bar .filter-btn:focus-visible {
  border-color: var(--cyan);
  color: var(--white);
}

.page-about .about-timeline__bar .filter-btn.is-active {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--abyss);
}

.page-about .about-timeline__body {
  display: grid;
  gap: 28px;
}

.page-about .about-timeline__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: rgba(155, 234, 242, 0.16);
}

.page-about .about-milestone {
  padding: 18px 18px 18px 22px;
  background: rgba(6, 24, 38, 0.72);
  border-left: 2px solid var(--line-strong);
  transition: opacity 0.18s var(--ease), transform 0.18s var(--ease), border-left-color 0.18s var(--ease);
}

.page-about .about-milestone:hover {
  border-left-color: var(--amber);
}

.page-about .about-milestone__year {
  display: block;
  font-size: 26px;
  line-height: 1;
  color: var(--amber);
}

.page-about .about-milestone h3 {
  margin: 8px 0 6px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 17px;
  color: var(--white);
}

.page-about .about-milestone p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--cyan-soft);
}

.page-about .about-milestone.is-hidden {
  display: none;
}

.page-about .about-timeline__figure {
  margin: 0;
  background: var(--abyss);
}

.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 10 / 7;
}

.page-about .about-timeline__figure figcaption {
  padding: 10px 14px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--steel);
}

/* ---------- 承诺 ---------- */
.page-about .about-promise {
  background: var(--abyss);
  color: var(--white);
}

.page-about .about-promise__grid {
  display: grid;
  gap: 26px;
}

.page-about .about-promise__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 4.6vw, 48px);
  line-height: 1.06;
  color: var(--white);
}

.page-about .about-promise__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--cyan-soft);
  max-width: 46ch;
}

.page-about .about-promise__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--line);
}

.page-about .about-promise__list li {
  padding: 16px 18px;
  background: rgba(11, 42, 69, 0.7);
}

.page-about .about-promise__k {
  display: block;
  margin-bottom: 4px;
  font-size: 15px;
  color: var(--amber);
}

.page-about .about-promise__list p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--cyan-soft);
}

.page-about .about-promise__cta {
  padding: 20px;
  border: 1px solid var(--line-strong);
  background: rgba(36, 214, 232, 0.06);
}

.page-about .about-promise__cta p {
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--cyan-soft);
}

/* ---------- 媒体查询 ---------- */
@media (min-width: 720px) {
  .page-about .about-team {
    grid-template-columns: repeat(3, 1fr);
  }

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: 36px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: end;
  }

  .page-about .about-main__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 88px;
  }

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

  .page-about .about-channels__item:nth-child(5) {
    grid-column: 1 / -1;
  }

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

  .page-about .about-timeline__body {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 40px;
    align-items: start;
  }

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

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

  .page-about .about-promise__lead {
    grid-row: 1 / span 2;
  }

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

@media (min-width: 1180px) {
  .page-about .about-channels {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-channels__item:nth-child(5) {
    grid-column: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__role,
  .page-about .about-team__role::after,
  .page-about .about-milestone,
  .page-about .about-rail__list a,
  .page-about .about-timeline__bar .filter-btn {
    transition: none;
  }
}
<<<END>>>