.page-about {
  --about-rail: 232px;
  --about-flow-gap: clamp(30px, 5vw, 62px);
  position: relative;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding-top: clamp(16px, 3vw, 26px);
}
.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--c-mist);
}
.page-about .breadcrumbs li + li::before {
  content: "/";
  margin: 0 8px;
  color: var(--c-line);
}
.page-about .breadcrumbs a {
  color: var(--c-mist);
  text-decoration: none;
  transition: color .2s var(--ease);
}
.page-about .breadcrumbs a:hover {
  color: var(--c-blue);
}
.page-about .breadcrumbs [aria-current="page"] {
  color: var(--c-ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(30px, 5vw, 62px) 0 clamp(38px, 6vw, 84px);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(58% 68% at 84% 12%, rgba(139, 92, 255, .3), transparent 62%),
    radial-gradient(48% 56% at 4% 90%, rgba(47, 199, 255, .14), transparent 70%);
  pointer-events: none;
}
.page-about .about-hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 46px);
  align-items: end;
}
.page-about .about-hero__inner::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: -14px;
  height: 1px;
  background: linear-gradient(90deg, var(--c-neon), rgba(58, 42, 107, .6) 42%, transparent 78%);
}
.page-about .about-hero__inner::after {
  content: "";
  position: absolute;
  left: 0;
  top: -19px;
  width: 1px;
  height: 10px;
  background: var(--c-neon);
}
.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(34px, 6.2vw, 74px);
  line-height: 1.05;
  letter-spacing: -.022em;
}
.page-about .about-hero__lede {
  max-width: 54ch;
  margin: 18px 0 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
}
.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px clamp(24px, 4vw, 44px);
  margin: clamp(24px, 3vw, 34px) 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--c-line);
}
.page-about .about-fact {
  margin: 0;
}
.page-about .about-fact__label {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--c-mist);
}
.page-about .about-fact__num {
  display: block;
  margin-top: 4px;
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--c-ink);
  text-shadow: 0 0 18px rgba(139, 92, 255, .55);
}
.page-about .about-fact__unit {
  margin-left: 3px;
  font-size: 12px;
  font-weight: 400;
  color: var(--c-mist);
  text-shadow: none;
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--c-line);
  border-radius: 3px;
  background: linear-gradient(150deg, var(--c-panel), var(--c-night) 72%);
}
.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  left: 16px;
  bottom: 16px;
  width: 44px;
  height: 1px;
  background: var(--c-amber);
  box-shadow: 0 0 10px rgba(255, 176, 46, .7);
}
.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.14fr) minmax(0, .86fr);
    gap: clamp(34px, 4.6vw, 68px);
  }
  .page-about .about-hero__figure img {
    aspect-ratio: 4 / 5;
  }
}

/* ---------- 双栏主体 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  padding-bottom: clamp(50px, 8vw, 110px);
}
.page-about .about-flow {
  min-width: 0;
}

/* 左侧章节轨道 */
.page-about .about-rail {
  min-width: 0;
}
.page-about .about-rail__title {
  margin: 0;
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--c-mist);
}
.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 12px 0 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.page-about .about-rail__list::-webkit-scrollbar {
  display: none;
}
.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 13px;
  border: 1px solid var(--c-line);
  border-radius: 2px;
  color: var(--c-mist);
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}
.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--c-ink);
  border-color: var(--c-neon);
}
.page-about .about-rail__idx {
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--c-neon);
}

@media (min-width: 1040px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-flow-gap);
  }
  .page-about .about-rail {
    position: sticky;
    top: calc(var(--topbar-h) + 28px);
    align-self: start;
    padding-right: 22px;
    border-right: 1px solid var(--c-line);
  }
  .page-about .about-rail__list {
    display: block;
    margin-top: 16px;
    padding: 0;
    overflow: visible;
  }
  .page-about .about-rail__list li + li {
    margin-top: 2px;
  }
  .page-about .about-rail__link {
    position: relative;
    display: flex;
    align-items: baseline;
    gap: 10px;
    padding: 11px 0 11px 16px;
    border: 0;
    border-left: 1px solid var(--c-line);
    border-radius: 0;
    white-space: normal;
    font-size: 13.5px;
  }
  .page-about .about-rail__link::before {
    content: "";
    position: absolute;
    left: -3px;
    top: 50%;
    width: 5px;
    height: 5px;
    margin-top: -2.5px;
    border-radius: 50%;
    background: var(--c-line);
    transition: background-color .2s var(--ease), box-shadow .2s var(--ease);
  }
  .page-about .about-rail__link:hover {
    border-left-color: var(--c-neon);
  }
  .page-about .about-rail__link:hover::before {
    background: var(--c-amber);
    box-shadow: 0 0 8px rgba(255, 176, 46, .8);
  }
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  scroll-margin-top: calc(var(--topbar-h) + 22px);
  padding-bottom: clamp(30px, 5vw, 54px);
  margin-bottom: clamp(30px, 5vw, 54px);
  border-bottom: 1px solid var(--c-line);
}
.page-about .about-chapter--last {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}
.page-about .about-chapter__head {
  margin-bottom: 20px;
}
.page-about .about-chapter__title {
  margin: 8px 0 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.22;
  letter-spacing: -.012em;
  color: var(--c-ink);
}
.page-about .about-chapter__body {
  max-width: 68ch;
}
.page-about .about-chapter__body p {
  margin: 0 0 16px;
}
.page-about .about-chapter__body p:last-child {
  margin-bottom: 0;
}

/* 要点列表 */
.page-about .about-list {
  max-width: 68ch;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}
.page-about .about-list li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-ink);
}
.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .74em;
  width: 10px;
  height: 1px;
  background: var(--c-blue);
  box-shadow: 0 0 8px rgba(47, 199, 255, .6);
}
.page-about .about-list strong {
  color: var(--c-ink);
  font-weight: 600;
}

/* 引用块 */
.page-about .about-quote {
  max-width: 62ch;
  margin: 28px 0 0;
  padding: 20px 22px;
  background: var(--c-deep);
  border-left: 1px solid var(--c-neon);
  color: var(--c-ink);
  font-family: var(--font-serif);
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.75;
  letter-spacing: -.005em;
}

/* 配图 */
.page-about .about-figure {
  margin: clamp(24px, 4vw, 36px) 0 0;
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: 3px;
  border: 1px solid var(--c-line);
}
.page-about .about-figure--wide img {
  aspect-ratio: 16 / 7;
}
.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--c-mist);
}

/* 团队结构图 */
.page-about .about-diagram {
  display: block;
  width: 100%;
  max-width: 720px;
  height: auto;
  margin: clamp(22px, 3vw, 32px) 0 0;
}

/* 岗位块 */
.page-about .about-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 22px;
}
.page-about .about-role {
  padding: 20px 18px;
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  border-radius: 3px;
  outline: none;
  transition: border-color .22s var(--ease), transform .22s var(--ease);
}
.page-about .about-role:hover,
.page-about .about-role:focus-visible {
  border-color: var(--c-neon);
  transform: translateY(-3px);
}
.page-about .about-role__num {
  margin: 0;
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--c-neon);
}
.page-about .about-role__name {
  margin: 10px 0 8px;
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 600;
  color: var(--c-ink);
}
.page-about .about-role__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--c-mist);
}
.page-about .about-role__detail {
  margin: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 13px;
  line-height: 1.65;
  color: var(--c-blue);
  transition: max-height .28s var(--ease), opacity .24s var(--ease), margin-top .24s var(--ease);
}
.page-about .about-role:hover .about-role__detail,
.page-about .about-role:focus-visible .about-role__detail {
  max-height: 96px;
  opacity: 1;
  margin-top: 10px;
}

@media (min-width: 760px) {
  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
@media (hover: none) {
  .page-about .about-role__detail {
    max-height: none;
    opacity: 1;
    margin-top: 10px;
  }
}

/* ---------- 沿革时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: clamp(24px, 3vw, 34px) 0 0;
  padding: 0 0 0 34px;
  list-style: none;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(to bottom, var(--c-neon), var(--c-line) 52%, var(--c-blue));
}
.page-about .about-timeline__item {
  position: relative;
  padding-bottom: clamp(24px, 3.4vw, 36px);
}
.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}
.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-night);
  border: 1px solid var(--c-amber);
  box-shadow: 0 0 0 4px rgba(255, 176, 46, .1);
}
.page-about .about-timeline__num {
  margin: 0;
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--c-amber);
}
.page-about .about-timeline__title {
  margin: 6px 0 8px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 18px;
  line-height: 1.35;
  color: var(--c-ink);
}
.page-about .about-timeline__body {
  max-width: 60ch;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--c-mist);
}

/* ---------- 服务标准 ---------- */
.page-about .about-standards {
  margin: clamp(24px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-standard {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 0 14px;
  padding: 22px 0;
  border-top: 1px solid var(--c-line);
}
.page-about .about-standards li:last-child {
  border-bottom: 1px solid var(--c-line);
}
.page-about .about-standard__idx {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -.01em;
  color: var(--c-amber);
}
.page-about .about-standard__title {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.4;
  color: var(--c-ink);
}
.page-about .about-standard p {
  max-width: 62ch;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--c-mist);
}

/* ---------- 本地与联系 ---------- */
.page-about .about-links {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin: clamp(24px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px;
  background: var(--c-deep);
  border: 1px solid var(--c-line);
  border-radius: 3px;
  text-decoration: none;
  color: var(--c-ink);
  transition: border-color .22s var(--ease), background-color .22s var(--ease);
}
.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  border-color: var(--c-blue);
  background: var(--c-panel);
}
.page-about .about-link__label {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -.005em;
}
.page-about .about-link__desc {
  font-size: 13px;
  line-height: 1.65;
  color: var(--c-mist);
}

.page-about .about-contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 0;
  background: var(--c-line);
  border: 1px solid var(--c-line);
  border-radius: 3px;
  overflow: hidden;
}
.page-about .about-contact__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 18px;
  background: var(--c-night);
}
.page-about .about-contact__row dt {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--c-mist);
}
.page-about .about-contact__row dd {
  margin: 0;
  font-size: 14.5px;
  color: var(--c-ink);
  word-break: break-word;
}
.page-about .about-contact__note {
  max-width: 64ch;
  margin: 14px 0 0;
  font-size: 12.5px;
  line-height: 1.72;
  color: var(--c-mist);
}

@media (min-width: 760px) {
  .page-about .about-links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-contact {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-role__detail,
  .page-about .about-link,
  .page-about .about-rail__link {
    transition: none;
  }
  .page-about .about-role:hover,
  .page-about .about-role:focus-visible {
    transform: none;
  }
}
</main>