.page-about {
  background: var(--ink-900);
  color: var(--snow);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  margin: 0;
  font-family: var(--font-display);
  line-height: 1.22;
}

.page-about p {
  margin: 0;
}

.page-about a {
  color: inherit;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  border-bottom: 1px solid var(--orbit);
  background: linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 100%);
}

.page-about .about-hero__frame {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.page-about .about-hero__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 32%;
  opacity: 0.44;
  filter: saturate(0.92) contrast(1.05);
}

.page-about .about-hero__scrim {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(112deg, rgba(11, 26, 58, 0.96) 18%, rgba(11, 26, 58, 0.62) 55%, rgba(108, 74, 182, 0.34) 100%),
    radial-gradient(60% 55% at 78% 18%, rgba(127, 216, 216, 0.18), transparent 70%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  gap: 1.05rem;
  padding-block: clamp(2.5rem, 8vw, 5rem) clamp(2.75rem, 7vw, 5.5rem);
  min-height: clamp(30rem, 74vh, 44rem);
  justify-content: flex-end;
}

.page-about .about-hero__eyebrow {
  margin-top: clamp(1.25rem, 4vw, 2.5rem);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--glacier);
}

.page-about .about-hero__title {
  font-size: clamp(2.15rem, 6.2vw, 4.15rem);
  font-weight: 800;
  letter-spacing: 0.02em;
  max-width: 20ch;
  text-wrap: balance;
}

.page-about .about-hero__lede {
  max-width: 48ch;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--snow);
}

.page-about .about-hero__meta {
  display: grid;
  gap: 0.75rem;
  margin: 0.75rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__meta-item {
  display: flex;
  gap: 0.6rem;
  align-items: baseline;
  padding-left: 0.85rem;
  border-left: 2px solid rgba(127, 216, 216, 0.55);
  font-size: 0.9375rem;
  color: var(--dust);
}

.page-about .about-hero__meta-item .mono-index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--gold);
}

@media (min-width: 760px) {
  .page-about .about-hero__meta {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
    max-width: 64rem;
  }
}

/* ---------- 章节骨架 ---------- */

.page-about .about-block {
  padding-block: clamp(3rem, 8vw, 5.75rem);
  position: relative;
}

.page-about .about-block--alt {
  background: var(--ink-800);
  border-top: 1px solid var(--orbit);
  border-bottom: 1px solid var(--orbit);
}

.page-about .about-block--band {
  background:
    radial-gradient(80% 70% at 12% 0%, rgba(108, 74, 182, 0.22), transparent 65%),
    var(--ink-900);
}

.page-about .section__title {
  font-size: clamp(1.75rem, 4vw, 2.6rem);
  font-weight: 700;
  max-width: 26ch;
}

.page-about .section__intro {
  max-width: 60ch;
  color: var(--dust);
  font-size: 1.0625rem;
  line-height: 1.85;
  margin-top: 0.9rem;
}

/* ---------- 服务原则 ---------- */

.page-about .principles {
  display: grid;
  gap: 1.15rem;
  margin-top: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .principle {
  position: relative;
  padding: 1.65rem 1.4rem 1.5rem;
  background: linear-gradient(158deg, rgba(18, 34, 74, 0.96), rgba(11, 26, 58, 0.82));
  border: 1px solid var(--orbit);
  border-radius: 6px 0 6px 0;
  box-shadow: inset 0 1px 0 rgba(232, 236, 247, 0.07);
  transition: transform 120ms var(--ease), box-shadow 120ms var(--ease);
}

.page-about .principle::after {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: var(--notch);
  height: var(--notch);
  background: var(--ink-900);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
}

.page-about .principle:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 0 1px rgba(127, 216, 216, 0.35), 0 14px 32px rgba(11, 26, 58, 0.6);
}

.page-about .principle__index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--violet-soft);
}

.page-about .principle__title {
  margin-top: 0.85rem;
  font-size: clamp(1.2rem, 2.2vw, 1.5rem);
  font-weight: 700;
}

.page-about .principle__text {
  margin-top: 0.7rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--dust);
}

.page-about .principle__fact {
  margin-top: 1.1rem;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--orbit);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--glacier);
}

@media (min-width: 860px) {
  .page-about .principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .principle:nth-child(2) {
    margin-top: 2rem;
  }

  .page-about .principle:nth-child(3) {
    margin-top: 4rem;
  }
}

/* ---------- 时间线 ---------- */

.page-about .timeline {
  position: relative;
  list-style: none;
  margin: clamp(1.75rem, 4vw, 2.75rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1.9rem;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 0.4rem;
  top: 0.6rem;
  bottom: 0.6rem;
  width: 1px;
  background: linear-gradient(180deg, var(--violet) 0%, var(--glacier) 55%, var(--gold) 100%);
  opacity: 0.6;
}

.page-about .timeline__item {
  position: relative;
  padding-left: 2.1rem;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.45rem;
  width: 0.85rem;
  height: 0.85rem;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--gold);
  box-shadow: 0 0 0 4px rgba(242, 183, 5, 0.13);
}

.page-about .timeline__year {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .timeline__title {
  margin-top: 0.35rem;
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  font-weight: 700;
}

.page-about .timeline__text {
  margin-top: 0.55rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--dust);
  max-width: 62ch;
}

.page-about .timeline__more {
  margin-top: 0.8rem;
  padding-top: 0.65rem;
  border-top: 1px dashed var(--orbit);
  max-width: 62ch;
}

.page-about .timeline__more summary {
  cursor: pointer;
  font-size: 0.875rem;
  color: var(--glacier);
  list-style: none;
}

.page-about .timeline__more summary::-webkit-details-marker {
  display: none;
}

.page-about .timeline__more summary::after {
  content: " ＋";
  font-family: var(--font-mono);
}

.page-about .timeline__more[open] summary::after {
  content: " －";
}

.page-about .timeline__more summary:focus-visible {
  outline: 2px solid var(--glacier);
  outline-offset: 3px;
}

.page-about .timeline__more p {
  margin-top: 0.6rem;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--dust);
}

@media (min-width: 860px) {
  .page-about .timeline::before {
    left: 7.3rem;
  }

  .page-about .timeline__item {
    display: grid;
    grid-template-columns: 6rem minmax(0, 1fr);
    column-gap: 2.6rem;
    padding-left: 0;
  }

  .page-about .timeline__item::before {
    left: 6.875rem;
  }

  .page-about .timeline__year {
    text-align: right;
    padding-top: 0.15rem;
  }

  .page-about .timeline__title {
    margin-top: 0;
  }
}

/* ---------- 覆盖数据带 ---------- */

.page-about .band {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
  background: var(--orbit);
  border: 1px solid var(--orbit);
}

.page-about .band__item {
  background: var(--ink-800);
  padding: 1.4rem 1.15rem;
  transition: background 120ms var(--ease);
}

.page-about .band__item:hover {
  background: var(--ink-900);
}

.page-about .band__value {
  display: flex;
  align-items: baseline;
  gap: 0.3rem;
}

.page-about .band__num {
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 3.4vw, 2.35rem);
  font-weight: 700;
  color: var(--gold);
  letter-spacing: 0.01em;
}

.page-about .band__unit {
  font-size: 0.9375rem;
  color: var(--snow);
}

.page-about .band__label {
  display: block;
  margin-top: 0.45rem;
  font-size: 0.9375rem;
  color: var(--snow);
}

.page-about .band__note {
  display: block;
  margin-top: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--dust);
}

@media (min-width: 900px) {
  .page-about .band {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 服务网络 ---------- */

.page-about .network {
  display: grid;
  gap: 2rem;
  margin-top: clamp(2rem, 4vw, 3rem);
}

.page-about .network__figure .figure__frame {
  border: 1px solid var(--orbit);
  border-radius: 6px 0 6px 0;
  overflow: hidden;
}

.page-about .network__figure .figure__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .network__title {
  font-size: clamp(1.15rem, 2.2vw, 1.5rem);
  font-weight: 700;
}

.page-about .network__list {
  margin: 1.1rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.9rem;
}

.page-about .network__list-item {
  position: relative;
  padding-left: 1.5rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--snow);
}

.page-about .network__list-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72rem;
  width: 0.6rem;
  height: 2px;
  background: var(--glacier);
}

.page-about .network__text {
  margin-top: 1.1rem;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--dust);
}

@media (min-width: 940px) {
  .page-about .network {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    gap: 2.75rem;
  }
}

/* ---------- 团队 ---------- */

.page-about .team {
  display: grid;
  gap: 1.15rem;
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
}

.page-about .team__card {
  position: relative;
  padding: 1.6rem 1.4rem 1.45rem;
  background: linear-gradient(200deg, rgba(108, 74, 182, 0.24), rgba(11, 26, 58, 0.92) 62%);
  border: 1px solid var(--orbit);
  border-radius: 6px 0 6px 0;
  box-shadow: inset 0 1px 0 rgba(232, 236, 247, 0.07);
}

.page-about .team__card::after {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: var(--notch);
  height: var(--notch);
  background: var(--ink-900);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
}

.page-about .team__num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--violet-soft);
}

.page-about .team__role {
  margin-top: 0.8rem;
  font-size: clamp(1.15rem, 2.2vw, 1.4rem);
  font-weight: 700;
}

.page-about .team__text {
  margin-top: 0.7rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--dust);
}

.page-about .team__size {
  margin-top: 1rem;
  padding-top: 0.7rem;
  border-top: 1px dashed var(--orbit);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--glacier);
}

.page-about .team-side {
  display: grid;
  gap: 1.75rem;
  margin-top: clamp(2rem, 4vw, 3rem);
  padding-top: clamp(1.75rem, 4vw, 2.5rem);
  border-top: 1px solid var(--orbit);
}

.page-about .team-side__figure .figure__frame {
  border: 1px solid var(--orbit);
  border-radius: 6px 0 6px 0;
  overflow: hidden;
}

.page-about .team-side__figure .figure__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .team-side__title {
  font-size: clamp(1.15rem, 2.2vw, 1.45rem);
  font-weight: 700;
}

.page-about .team-side__text {
  margin-top: 0.8rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--dust);
}

@media (min-width: 860px) {
  .page-about .team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .team__card:nth-child(2) {
    margin-top: 1.75rem;
  }

  .page-about .team__card:nth-child(3) {
    margin-top: 3.5rem;
  }
}

@media (min-width: 940px) {
  .page-about .team-side {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    align-items: center;
    gap: 2.5rem;
  }
}

/* ---------- 合作与资质 ---------- */

.page-about .segment {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
}

.page-about .segment__btn:focus-visible {
  outline: 2px solid var(--glacier);
  outline-offset: 3px;
}

.page-about .partner-detail {
  margin-top: 1.4rem;
  padding: 1.5rem 1.35rem;
  background: rgba(11, 26, 58, 0.72);
  border: 1px solid var(--orbit);
  border-left: 3px solid var(--violet);
  border-radius: 6px 0 6px 0;
}

.page-about .partner-detail__title {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  font-weight: 700;
}

.page-about .partner-detail__text {
  margin-top: 0.7rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--snow);
  max-width: 62ch;
}

.page-about .partner-detail__meta {
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--orbit);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--dust);
}

.page-about .credential {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
  padding-top: 1.35rem;
  border-top: 1px solid var(--orbit);
  display: grid;
  gap: 0.75rem;
}

.page-about .credential__row {
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--dust);
  max-width: 68ch;
}

.page-about .credential__code {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  color: var(--snow);
}

/* ---------- 收尾入口 ---------- */

.page-about .about-cta {
  padding-block: clamp(2.75rem, 7vw, 4.5rem);
  background:
    radial-gradient(70% 90% at 85% 10%, rgba(242, 183, 5, 0.16), transparent 68%),
    linear-gradient(120deg, rgba(108, 74, 182, 0.42), rgba(11, 26, 58, 0.94) 62%);
  border-top: 1px solid var(--orbit);
}

.page-about .about-cta__grid {
  display: grid;
  gap: 1rem;
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
}

.page-about .about-cta__card {
  display: block;
  padding: 1.3rem 1.2rem;
  background: rgba(11, 26, 58, 0.66);
  border: 1px solid var(--orbit);
  border-radius: 6px 0 6px 0;
  text-decoration: none;
  transition: transform 120ms var(--ease), border-color 120ms var(--ease), box-shadow 120ms var(--ease);
}

.page-about .about-cta__card:hover {
  transform: translateY(-2px);
  border-color: var(--glacier);
  box-shadow: 0 12px 30px rgba(11, 26, 58, 0.65);
}

.page-about .about-cta__card:focus-visible {
  outline: 2px solid var(--glacier);
  outline-offset: 3px;
}

.page-about .about-cta__card-title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--snow);
}

.page-about .about-cta__card-text {
  margin-top: 0.5rem;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--dust);
}

@media (min-width: 700px) {
  .page-about .about-cta__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .about-cta__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .principle,
  .page-about .about-cta__card,
  .page-about .band__item {
    transition: opacity 150ms linear;
  }

  .page-about .principle:hover,
  .page-about .about-cta__card:hover {
    transform: none;
  }
}