.page-about {
  background: var(--navy-950);
  color: var(--ice-100);
  overflow-x: clip;
}

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

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: clamp(2rem, 5vw, 3.25rem) clamp(3rem, 7vw, 6rem);
  border-bottom: var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -20%;
  right: -22%;
  width: min(680px, 88vw);
  aspect-ratio: 1;
  background: radial-gradient(circle at 50% 50%, rgba(255, 107, 26, 0.16), rgba(255, 107, 26, 0) 68%);
  pointer-events: none;
}

.page-about .breadcrumbs {
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
  font-size: 0.8125rem;
  color: var(--mist-300);
}

.page-about .breadcrumbs a {
  color: var(--mist-300);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--orange-500);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 3.5rem);
}

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

.page-about .about-hero__title {
  margin: 0.5rem 0 0;
  font-size: clamp(2.35rem, 7.4vw, 5rem);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.02em;
}

.page-about .about-hero__title span {
  display: block;
  color: var(--mist-300);
  font-weight: 700;
}

.page-about .about-hero__lead {
  margin: clamp(1.25rem, 3vw, 1.75rem) 0 0;
  max-width: 46ch;
  color: var(--mist-300);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(1.75rem, 4vw, 2.75rem) 0 0;
  padding: clamp(1.25rem, 3vw, 1.75rem) 0 0;
  border-top: var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: clamp(1.25rem, 4vw, 3rem);
}

.page-about .about-hero__facts li {
  display: grid;
  gap: 0.25rem;
  min-width: 0;
}

.page-about .about-hero__num {
  font-size: clamp(1.5rem, 3.6vw, 2.25rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: var(--ice-100);
}

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

.page-about .about-hero__facts .caption {
  color: var(--mist-300);
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  min-width: 0;
  border: var(--line);
  background: var(--navy-900);
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  aspect-ratio: 7 / 5;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.05) brightness(0.78);
}

.page-about .media-frame__caption {
  display: block;
  padding: 0.75rem 1rem;
  font-size: 0.8125rem;
  color: var(--mist-300);
  border-top: var(--line);
  background: var(--navy-900);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-chapter {
  padding-block: clamp(3rem, 8vw, 6.5rem);
  border-bottom: var(--line);
}

.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.25rem, 4vw, 2rem);
}

.page-about .about-chapter__aside {
  display: flex;
  align-items: center;
  gap: 0.875rem;
}

.page-about .about-chapter__index {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--orange-500);
}

.page-about .about-chapter__note {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.24em;
  color: var(--mist-300);
}

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

.page-about .about-chapter__body > .h2 {
  margin: 0 0 clamp(1rem, 2.5vw, 1.5rem);
}

.page-about .about-chapter__lead {
  margin: 0 0 1rem;
  max-width: 58ch;
  font-size: clamp(1.05rem, 1.7vw, 1.1875rem);
  line-height: 1.8;
  color: var(--ice-100);
}

.page-about .about-chapter__body p {
  max-width: 64ch;
  margin: 0 0 1rem;
  line-height: 1.85;
  color: var(--mist-300);
}

.page-about .about-chapter__body .h3 {
  margin: 0 0 0.5rem;
}

/* ---------- 01 角色分工 ---------- */

.page-about .about-role {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--navy-700);
  border: var(--line);
}

.page-about .about-role__item {
  background: var(--navy-900);
  padding: clamp(1.25rem, 3vw, 1.75rem);
  transition: background-color var(--dur) var(--ease);
}

.page-about .about-role__item:hover,
.page-about .about-role__item:focus-within {
  background: var(--navy-800);
}

.page-about .about-role__label {
  margin: 0 0 0.75rem;
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--teal-400);
}

.page-about .about-role__item p:last-child {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
}

/* ---------- 02 时间线 ---------- */

.page-about .about-timeline {
  list-style: none;
  --tl-pad: clamp(1.5rem, 4vw, 2.5rem);
  position: relative;
  margin: clamp(1.75rem, 4vw, 2.75rem) 0 0;
  padding: 0 0 0 var(--tl-pad);
  display: grid;
  gap: clamp(2rem, 4vw, 3rem);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 0.75rem;
  bottom: 0.75rem;
  width: 1px;
  background: linear-gradient(180deg, var(--teal-400) 0%, var(--navy-700) 55%, rgba(26, 47, 82, 0) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  min-width: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--tl-pad));
  top: 0.6rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--navy-950);
  border: 1px solid var(--teal-400);
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  background: var(--orange-500);
  border-color: var(--orange-500);
  box-shadow: 0 0 0 5px rgba(255, 107, 26, 0.12);
}

.page-about .about-timeline__year {
  margin: 0 0 0.5rem;
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--mist-300);
  transition: color var(--dur) var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__year,
.page-about .about-timeline__item:focus-within .about-timeline__year {
  color: var(--orange-500);
}

.page-about .about-timeline__item p {
  margin: 0 0 0.5rem;
  max-width: 58ch;
  line-height: 1.8;
  color: var(--mist-300);
}

.page-about .about-timeline__more {
  margin: 0;
  padding-left: 0.875rem;
  border-left: 1px solid var(--navy-700);
  font-size: 0.875rem;
  color: var(--mist-300);
  opacity: 0.5;
  transition: opacity var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__more,
.page-about .about-timeline__item:focus-within .about-timeline__more {
  opacity: 1;
  border-color: var(--teal-400);
  color: var(--ice-100);
}

/* ---------- 03 团队面板 ---------- */

.page-about .about-team {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(0.875rem, 2.5vw, 1.25rem);
}

.page-about .about-team__card {
  position: relative;
  min-width: 0;
  padding: clamp(1.25rem, 3vw, 1.75rem);
  border: var(--line);
  background: linear-gradient(158deg, var(--navy-800) 0%, var(--navy-900) 100%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-team__card:hover,
.page-about .about-team__card:focus-within {
  border-color: var(--navy-500);
  background: linear-gradient(158deg, var(--navy-800) 0%, var(--navy-700) 100%);
}

.page-about .about-team__id {
  margin: 0 0 0.875rem;
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--teal-400);
}

.page-about .about-team__num {
  margin: 0 0 0.75rem;
  font-size: clamp(1.75rem, 4.5vw, 2.5rem);
  font-weight: 700;
  line-height: 1.05;
  color: var(--ice-100);
}

.page-about .about-team__num span {
  margin-left: 0.25rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--mist-300);
}

.page-about .about-team__duty {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--mist-300);
  opacity: 0.75;
  transition: opacity var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-team__card:hover .about-team__duty,
.page-about .about-team__card:focus-within .about-team__duty {
  opacity: 1;
  color: var(--ice-100);
}

.page-about .about-figure {
  margin: clamp(2rem, 4vw, 2.75rem) 0 0;
  border: var(--line);
  background: var(--navy-900);
  overflow: hidden;
  clip-path: polygon(16px 0, 100% 0, 100% 100%, 0 100%, 0 16px);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  filter: saturate(0.88) brightness(0.8);
}

.page-about .about-checks {
  list-style: none;
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--navy-700);
  border: var(--line);
}

.page-about .about-checks li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--navy-900);
  padding: 1rem 1.25rem;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--ice-100);
}

.page-about .about-checks li::before {
  content: "";
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--teal-400);
}

/* ---------- 04 服务地区 ---------- */

.page-about .about-region {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
}

.page-about .about-region__figure {
  margin: 0;
  min-width: 0;
  border: var(--line);
  background: var(--navy-900);
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%);
}

.page-about .about-region__figure img {
  display: block;
  width: 100%;
  aspect-ratio: 9 / 7;
  object-fit: cover;
  filter: saturate(0.85) brightness(0.82);
}

.page-about .about-region__text p {
  max-width: 60ch;
}

.page-about .about-region__list {
  list-style: none;
  margin: clamp(1.25rem, 3vw, 1.75rem) 0 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
  border-top: var(--line);
  padding-top: clamp(1rem, 2.5vw, 1.5rem);
}

.page-about .about-region__list li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.02em;
  color: var(--ice-100);
}

.page-about .about-region__list .dot {
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--teal-400);
  box-shadow: 0 0 0 4px rgba(33, 212, 181, 0.1);
}

/* ---------- 05 内容生态 ---------- */

.page-about .about-eco {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--navy-700);
  border: var(--line);
}

.page-about .about-eco__item {
  background: var(--navy-950);
  padding: clamp(1.25rem, 3vw, 1.75rem);
  transition: background-color var(--dur) var(--ease);
}

.page-about .about-eco__item:hover,
.page-about .about-eco__item:focus-within {
  background: var(--navy-900);
}

.page-about .about-eco__item p {
  margin: 0;
  font-size: 0.9375rem;
}

.page-about .about-eco__link {
  margin: clamp(1.5rem, 4vw, 2rem) 0 0;
}

/* ---------- 06 里程碑 ---------- */

.page-about .about-miles {
  list-style: none;
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 clamp(1.75rem, 4vw, 2.5rem);
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: clamp(1.25rem, 3vw, 2.25rem);
}

.page-about .about-miles li {
  min-width: 0;
  padding-top: 0.875rem;
  border-top: 2px solid var(--navy-700);
}

.page-about .about-miles li:nth-child(2) {
  border-top-color: var(--orange-500);
}

.page-about .about-miles__num {
  display: block;
  font-size: clamp(1.75rem, 4.5vw, 2.5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: var(--ice-100);
}

.page-about .about-miles li:nth-child(2) .about-miles__num {
  color: var(--orange-500);
}

.page-about .about-miles__label {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.875rem;
  color: var(--mist-300);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  position: relative;
  overflow: hidden;
  padding-block: clamp(3rem, 7vw, 5.5rem);
  background: linear-gradient(120deg, var(--navy-900) 0%, var(--navy-950) 55%, rgba(16, 31, 58, 0.9) 100%);
}

.page-about .about-cta::after {
  content: "";
  position: absolute;
  left: -10%;
  bottom: -60%;
  width: 60%;
  height: 160%;
  background: linear-gradient(90deg, rgba(33, 212, 181, 0.06), rgba(33, 212, 181, 0));
  transform: rotate(12deg);
  pointer-events: none;
}

.page-about .about-cta__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.5rem);
  align-items: center;
}

.page-about .about-cta__text .h2 {
  margin: 0 0 0.875rem;
  max-width: 24ch;
}

.page-about .about-cta__text p {
  margin: 0;
  max-width: 56ch;
  line-height: 1.85;
  color: var(--mist-300);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-role {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 860px) {
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .about-chapter__grid {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4.5rem);
  }

  .page-about .about-chapter__aside {
    display: block;
    position: sticky;
    top: 5.5rem;
    align-self: start;
  }

  .page-about .about-chapter__note {
    margin: 0.875rem 0 0;
    writing-mode: vertical-rl;
    letter-spacing: 0.32em;
    font-family: var(--font-mono);
  }

  .page-about .about-region {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: center;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__figure img {
    aspect-ratio: 16 / 10;
  }

  .page-about .about-hero__figure {
    margin-right: -3rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}
<<<END>>>