.page-about {
  --about-chapter-pad: clamp(56px, 10vw, 118px);
  --about-sticky-top: calc(var(--header-offset) + 28px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--white);
  padding: clamp(30px, 7vw, 64px) 0 0;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(58% 50% at 84% 4%, rgba(127, 196, 217, 0.22), transparent 68%),
    radial-gradient(42% 42% at 4% 96%, rgba(255, 90, 31, 0.16), transparent 72%);
  pointer-events: none;
}

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

.page-about .about-hero .breadcrumbs__link {
  color: rgba(255, 255, 255, 0.68);
  transition: color var(--dur) var(--ease);
}

.page-about .about-hero .breadcrumbs__link:hover,
.page-about .about-hero .breadcrumbs__link:focus-visible {
  color: var(--amber);
}

.page-about .about-hero .breadcrumbs__item {
  color: rgba(255, 255, 255, 0.5);
}

.page-about .about-hero__eyebrow {
  color: var(--amber);
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 10.5vw, 6.6rem);
  line-height: 0.96;
  letter-spacing: -0.03em;
  font-weight: 700;
  margin: clamp(16px, 3vw, 28px) 0 0;
  max-width: 13ch;
}

.page-about .about-hero__lede {
  color: rgba(255, 255, 255, 0.76);
  max-width: 54ch;
  margin: clamp(20px, 3vw, 30px) 0 0;
  font-size: clamp(1rem, 1.2vw, 1.1rem);
  line-height: 1.85;
}

.page-about .about-hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-hero__chips span {
  border: 1px solid var(--line-light);
  border-radius: var(--pill);
  padding: 8px 16px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.82);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-hero__chips span:hover {
  border-color: var(--orange);
  color: var(--amber);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(30px, 5vw, 48px) 0 0;
  padding: clamp(20px, 3vw, 28px) 0 0;
  border-top: 1px solid var(--line-light);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(18px, 3vw, 30px);
}

.page-about .about-stat__value {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 4vw, 2.6rem);
  line-height: 1;
  letter-spacing: -0.02em;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.58);
}

.page-about .about-hero__figure {
  position: relative;
  z-index: 1;
  margin: clamp(38px, 6vw, 68px) 0 0;
  border-radius: var(--r-lg) var(--r-lg) 0 0;
  overflow: hidden;
  background: linear-gradient(140deg, var(--deep), var(--blue) 55%, var(--ice));
  aspect-ratio: 4 / 3;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 编号章节骨架 ---------- */
.page-about .about-chapter {
  padding: var(--about-chapter-pad) 0;
}

.page-about .about-chapter__grid {
  display: grid;
  gap: clamp(18px, 3vw, 34px);
}

.page-about .about-chapter__index {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-about .about-chapter__num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 8vw, 5rem);
  line-height: 0.82;
  letter-spacing: -0.04em;
  color: var(--orange);
}

.page-about .about-chapter__tag {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--text-muted);
}

.page-about .about-chapter__lede {
  margin-top: clamp(14px, 2vw, 20px);
  max-width: 52ch;
}

.page-about .about-chapter .section-title {
  margin: 0;
}

/* ---------- 四个坚持 ---------- */
.page-about .about-values {
  display: grid;
  gap: clamp(20px, 3vw, 28px);
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .about-value {
  border-top: 2px solid var(--line);
  padding-top: clamp(16px, 2vw, 22px);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-value:hover {
  border-top-color: var(--orange);
  transform: translateY(-2px);
}

.page-about .about-value__num {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .about-value__title {
  margin: 0.5em 0 0.45em;
  font-size: clamp(1.12rem, 2.2vw, 1.32rem);
  line-height: 1.4;
}

.page-about .about-value__text {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.8;
  font-size: 0.98rem;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0 0 0 28px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--orange), var(--ice) 52%, var(--line));
}

.page-about .about-milestone {
  position: relative;
  padding: 0 0 clamp(22px, 3vw, 30px);
}

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

.page-about .about-milestone::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--white);
  border: 2px solid var(--orange);
  box-sizing: border-box;
}

.page-about .about-milestone__meta {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  color: var(--blue);
}

.page-about .about-milestone__title {
  margin: 0.4em 0 0.4em;
  font-size: clamp(1.1rem, 2.2vw, 1.34rem);
  line-height: 1.4;
}

.page-about .about-milestone__text {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.8;
  font-size: 0.96rem;
  max-width: 62ch;
}

/* ---------- 团队 ---------- */
.page-about .about-team .section-title {
  color: var(--white);
}

.page-about .about-team .about-chapter__tag {
  color: rgba(255, 255, 255, 0.55);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  align-items: center;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-team__text .prose {
  color: var(--text-light);
}

.page-about .about-team__stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 2.5vw, 24px);
  margin: clamp(24px, 3.5vw, 34px) 0 0;
  padding-top: clamp(20px, 3vw, 28px);
  border-top: 1px solid var(--line-light);
}

.page-about .about-team__figure {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.6vw, 2.2rem);
  line-height: 1;
  color: var(--amber);
  letter-spacing: -0.02em;
}

.page-about .about-team__cap {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.6);
}

.page-about .about-team__media {
  margin: 0;
  border-radius: var(--r-md);
  overflow: hidden;
  background: linear-gradient(150deg, rgba(127, 196, 217, 0.4), rgba(18, 48, 59, 0.85));
  aspect-ratio: 12 / 7;
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 本地与覆盖 ---------- */
.page-about .about-network__grid {
  display: grid;
  gap: clamp(26px, 4vw, 56px);
  margin-top: clamp(20px, 3vw, 30px);
  align-items: start;
}

.page-about .about-network__list {
  list-style: none;
  margin: clamp(24px, 3.5vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-network__list li {
  position: relative;
  padding-left: 20px;
  line-height: 1.75;
  color: var(--text-muted);
  font-size: 0.96rem;
  border-bottom: 1px solid var(--line);
  padding-bottom: 14px;
}

.page-about .about-network__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--orange);
}

.page-about .about-network__list strong {
  color: var(--deep);
  margin-right: 0.5em;
}

.page-about .about-network__media {
  margin: 0;
  border-radius: var(--r-md);
  overflow: hidden;
  background: linear-gradient(160deg, var(--snow), var(--ice));
  aspect-ratio: 5 / 4;
}

.page-about .about-network__media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 资质 ---------- */
.page-about .about-creds {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: clamp(26px, 3.5vw, 38px) 0 0;
  padding: 0;
}

.page-about .about-cred {
  border: 1px solid var(--line-strong);
  border-radius: var(--pill);
  padding: 12px 20px;
  background: var(--white);
  font-size: 0.94rem;
  line-height: 1.3;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-cred strong {
  font-family: var(--font-mono);
  color: var(--orange);
  margin-right: 0.5em;
  font-weight: 600;
}

.page-about .about-cred:hover {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--white);
}

.page-about .about-cred:hover strong {
  color: var(--amber);
}

.page-about .about-creds__note {
  margin: clamp(20px, 3vw, 28px) 0 0;
  max-width: 62ch;
  color: var(--text-muted);
  line-height: 1.8;
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  padding: clamp(60px, 9vw, 112px) 0 clamp(48px, 7vw, 84px);
}

.page-about .about-cta__inner {
  position: relative;
}

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

.page-about .about-cta__title {
  font-family: var(--font-display);
  color: var(--white);
  font-size: clamp(2rem, 5.2vw, 3.6rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin: 0.5em 0 0;
  max-width: 16ch;
}

.page-about .about-cta__text {
  color: var(--text-light);
  max-width: 56ch;
  margin: clamp(16px, 2.5vw, 24px) 0 0;
  line-height: 1.85;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  margin-top: clamp(24px, 3.5vw, 38px);
}

.page-about .about-nodes {
  display: block;
  width: 100%;
  max-width: 640px;
  height: auto;
  margin-top: clamp(34px, 5vw, 56px);
}

.page-about .about-nodes__rail {
  fill: none;
  stroke: rgba(127, 196, 217, 0.45);
  stroke-width: 2;
}

.page-about .about-nodes__rail--soft {
  stroke: rgba(255, 255, 255, 0.16);
  stroke-dasharray: 5 7;
}

.page-about .about-nodes__node circle {
  fill: var(--ink);
  stroke: var(--ice);
  stroke-width: 2;
}

.page-about .about-nodes__node--main circle {
  fill: var(--orange);
  stroke: var(--amber);
}

.page-about .about-nodes__node text {
  fill: rgba(255, 255, 255, 0.78);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  text-anchor: middle;
}

.page-about .about-nodes__caption {
  fill: rgba(255, 255, 255, 0.5);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
}

.page-about .about-top {
  display: inline-block;
  margin-top: clamp(30px, 4vw, 46px);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  color: rgba(255, 255, 255, 0.6);
  text-decoration: none;
  border-bottom: 1px solid var(--line-light);
  padding-bottom: 4px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-top:hover,
.page-about .about-top:focus-visible {
  color: var(--amber);
  border-color: var(--amber);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-values {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-hero__figure {
    aspect-ratio: 16 / 9;
  }
}

@media (min-width: 820px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  }

  .page-about .about-network__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.86fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__title {
    margin-left: clamp(0px, 6vw, 92px);
  }

  .page-about .about-hero__figure {
    aspect-ratio: 21 / 9;
  }

  .page-about .about-chapter__grid {
    grid-template-columns: minmax(110px, 176px) minmax(0, 1fr);
    gap: clamp(30px, 5vw, 76px);
  }

  .page-about .about-chapter__index {
    display: block;
    position: sticky;
    top: var(--about-sticky-top);
    align-self: start;
  }

  .page-about .about-team__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 480px) {
  .page-about .about-hero__chips span {
    padding: 7px 13px;
    font-size: 0.72rem;
  }

  .page-about .about-cred {
    padding: 10px 16px;
    font-size: 0.88rem;
  }

  .page-about .about-cta__actions .btn {
    width: 100%;
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-value,
  .page-about .about-hero__chips span,
  .page-about .about-cred,
  .page-about .about-top {
    transition: none;
  }

  .page-about .about-value:hover {
    transform: none;
  }
}