.page-about {
  background: var(--snow);
  color: var(--ink);
  padding-top: var(--header-space);
  overflow-x: clip;
}

.page-about [id] {
  scroll-margin-top: calc(var(--header-space) + 16px);
}

/* ---------- 首屏分屏 ---------- */
.page-about .about-hero {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: clamp(.6rem, 2vw, 1.5rem) clamp(1rem, 4vw, 2.5rem) clamp(1.6rem, 4vw, 3rem);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.1rem, 3vw, 2.2rem);
}

.page-about .hero-media {
  position: relative;
  min-height: 260px;
  border-radius: var(--radius);
  overflow: hidden;
  background: linear-gradient(155deg, var(--ice-deep), #07293a 70%);
  box-shadow: var(--shadow-soft);
}

.page-about .hero-media::after {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 5px;
  background: linear-gradient(90deg, var(--orange) 0 32%, var(--pine) 32% 100%);
}

.page-about .hero-media img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 260px;
  object-fit: cover;
  opacity: .9;
}

.page-about .hero-badge {
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 12px;
  padding: .7rem .85rem;
  background: rgba(11, 34, 51, .58);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-left: 3px solid var(--orange);
  color: var(--snow);
}

.page-about .hero-badge-label {
  display: block;
  font-size: .72rem;
  letter-spacing: .18em;
  color: var(--orange-soft);
}

.page-about .hero-badge p {
  margin: .25rem 0 0;
  font-size: .86rem;
  line-height: 1.5;
}

.page-about .hero-copy {
  display: flex;
  flex-direction: column;
  gap: clamp(.8rem, 2vw, 1.1rem);
  min-width: 0;
}

.page-about .hero-copy h1 {
  margin: 0;
  font-size: clamp(1.95rem, 5.4vw, 3.4rem);
  line-height: 1.08;
  font-weight: 900;
  letter-spacing: -.015em;
  color: var(--ice-deep);
}

.page-about .hero-lede {
  margin: 0;
  max-width: 42em;
  font-size: clamp(.96rem, 1.6vw, 1.08rem);
  line-height: 1.8;
  color: var(--ink);
}

.page-about .hero-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(96px, 1fr));
  gap: 1px;
  background: var(--line);
  border-top: 2px solid var(--ice-deep);
  border-bottom: 1px solid var(--line);
}

.page-about .hero-facts li {
  background: var(--snow);
  padding: .75rem .6rem;
  display: flex;
  flex-direction: column;
  gap: .2rem;
  min-width: 0;
}

.page-about .fact-num {
  font-size: clamp(1.15rem, 2.4vw, 1.6rem);
  font-weight: 700;
  color: var(--orange);
  letter-spacing: .02em;
  overflow-wrap: anywhere;
}

.page-about .fact-label {
  font-size: .76rem;
  line-height: 1.45;
  color: var(--slate);
}

.page-about .hero-index ol {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .hero-index a {
  display: flex;
  align-items: center;
  gap: .8rem;
  padding: .6rem .2rem;
  border-bottom: 1px solid var(--line);
  font-size: .94rem;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  transition: color .18s ease, padding-left .18s ease;
}

.page-about .hero-index a .mono {
  font-size: .76rem;
  letter-spacing: .1em;
  color: var(--slate);
}

.page-about .hero-index a:hover,
.page-about .hero-index a:focus-visible {
  color: var(--orange);
  padding-left: .55rem;
}

/* ---------- 正文分屏 ---------- */
.page-about .about-body {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 clamp(1rem, 4vw, 2.5rem) clamp(2rem, 5vw, 4rem);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1rem, 3vw, 2.4rem);
}

.page-about .about-rail {
  border-top: 2px solid var(--orange);
  padding-top: .7rem;
  min-width: 0;
}

.page-about .rail-title {
  margin: 0 0 .5rem;
  font-size: .72rem;
  letter-spacing: .2em;
  color: var(--slate);
}

.page-about .rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: .4rem;
  overflow-x: auto;
  padding-bottom: .2rem;
}

.page-about .rail-list > li {
  flex: 0 0 auto;
}

.page-about .rail-list > li > a {
  display: block;
  white-space: nowrap;
  padding: .4rem .7rem;
  background: var(--ice);
  color: var(--ice-deep);
  font-size: .84rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius);
  transition: background-color .18s ease, color .18s ease;
}

.page-about .rail-list > li > a:hover,
.page-about .rail-list > li > a:focus-visible {
  background: var(--orange);
  color: var(--snow);
}

.page-about .rail-years {
  display: none;
}

.page-about .rail-note {
  margin: .7rem 0 0;
  font-size: .8rem;
  line-height: 1.65;
  color: var(--slate);
}

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

.page-about .about-section {
  padding-block: clamp(1.5rem, 4vw, 2.8rem);
}

.page-about .about-section + .about-section {
  border-top: 1px solid var(--line);
}

.page-about .sec-head {
  max-width: 60ch;
  margin-bottom: clamp(1rem, 3vw, 1.8rem);
}

.page-about .sec-head .eyebrow {
  margin: 0 0 .5rem;
}

.page-about .sec-head h2 {
  margin: 0 0 .7rem;
}

.page-about .sec-lede {
  margin: 0;
  font-size: .96rem;
  line-height: 1.8;
  color: var(--slate);
}

/* ---------- 团队 ---------- */
.page-about .crew {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.2rem, 3vw, 2rem);
  align-items: center;
}

.page-about .crew-ring {
  position: relative;
  width: clamp(148px, 26vw, 200px);
  aspect-ratio: 1;
  margin: 0 auto;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: conic-gradient(from -90deg,
      var(--orange) 0 42.9%,
      var(--ice-deep) 42.9% 64.3%,
      var(--pine) 64.3% 82.2%,
      var(--slate) 82.2% 100%);
}

.page-about .crew-ring::after {
  content: "";
  position: absolute;
  inset: 19%;
  border-radius: 50%;
  background: var(--snow);
}

.page-about .crew-ring-core {
  position: relative;
  z-index: 1;
  display: grid;
  text-align: center;
  gap: .15rem;
}

.page-about .crew-ring-num {
  font-size: clamp(1.5rem, 3vw, 1.9rem);
  font-weight: 700;
  color: var(--ice-deep);
}

.page-about .crew-ring-label {
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--slate);
}

.page-about .crew-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .5rem;
  min-width: 0;
}

.page-about .crew-item {
  display: grid;
  grid-template-columns: 3rem minmax(0, 1fr);
  gap: .8rem;
  padding: .75rem .85rem;
  background: var(--frost);
  border-left: 3px solid var(--line-strong);
  transition: border-color .18s ease, background-color .18s ease, transform .18s ease;
}

.page-about .crew-item:hover,
.page-about .crew-item:focus-within {
  border-left-color: var(--orange);
  background: var(--ice);
  transform: translateX(2px);
}

.page-about .crew-num {
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1;
  color: var(--ice-deep);
}

.page-about .crew-name {
  margin: 0 0 .25rem;
  font-size: .97rem;
  font-weight: 700;
}

.page-about .crew-detail {
  margin: 0;
  font-size: .85rem;
  line-height: 1.65;
  color: var(--slate);
}

/* ---------- 三道关 ---------- */
.page-about .gates {
  display: grid;
  grid-template-columns: 1fr;
  gap: .8rem;
}

.page-about .gate {
  --gate-accent: var(--orange);
  padding: 1rem 1rem 1.1rem;
  background: var(--snow);
  border: 1px solid var(--line);
  border-top: 4px solid var(--gate-accent);
  box-shadow: var(--shadow-card);
}

.page-about .gate:nth-child(2) {
  --gate-accent: var(--ice-deep);
}

.page-about .gate:nth-child(3) {
  --gate-accent: var(--pine);
}

.page-about .gate-no {
  display: block;
  margin-bottom: .4rem;
  font-size: .74rem;
  letter-spacing: .18em;
  color: var(--gate-accent);
}

.page-about .gate h3 {
  margin: 0 0 .5rem;
  font-size: 1.05rem;
}

.page-about .gate p {
  margin: 0;
  font-size: .88rem;
  line-height: 1.72;
  color: var(--slate);
}

.page-about .process-figure {
  margin: clamp(1rem, 3vw, 1.6rem) 0 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ice-deep);
}

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

/* ---------- 时间线 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: .5rem;
  bottom: .5rem;
  width: 2px;
  background: linear-gradient(180deg, var(--orange), var(--ice-deep) 58%, var(--ice));
}

.page-about .timeline li {
  position: relative;
  padding-bottom: clamp(1.1rem, 3vw, 1.7rem);
}

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

.page-about .timeline li::before {
  content: "";
  position: absolute;
  left: -19px;
  top: .4rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--snow);
  border: 3px solid var(--orange);
  transform: translateX(-50%);
}

.page-about .tl-year {
  display: block;
  margin-bottom: .25rem;
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--orange);
}

.page-about .timeline h3 {
  margin: 0 0 .35rem;
  font-size: 1.04rem;
}

.page-about .timeline p {
  margin: 0;
  font-size: .89rem;
  line-height: 1.72;
  color: var(--slate);
}

/* ---------- 协作网络 ---------- */
.page-about .network-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1rem, 3vw, 1.8rem);
  align-items: start;
}

.page-about .network-figure {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ice-deep);
}

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

.page-about .network-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .2rem;
}

.page-about .network-facts li {
  display: grid;
  grid-template-columns: 4.4rem minmax(0, 1fr);
  gap: .7rem;
  align-items: baseline;
  padding: .55rem .1rem;
  border-bottom: 1px solid var(--line);
}

.page-about .net-num {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--pine);
}

.page-about .net-text {
  font-size: .87rem;
  line-height: 1.65;
  color: var(--slate);
}

.page-about .network-note {
  margin: clamp(1rem, 3vw, 1.4rem) 0 0;
  padding: .85rem 1rem;
  background: var(--frost);
  border-left: 3px solid var(--pine);
  font-size: .89rem;
  line-height: 1.78;
  color: var(--ink);
}

/* ---------- 服务入口 ---------- */
.page-about .service-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: .8rem;
}

.page-about .service-card {
  display: flex;
  flex-direction: column;
  gap: .5rem;
  padding: 1rem;
  background: var(--snow);
  border: 1px solid var(--line);
  border-top: 3px solid var(--ice-deep);
  text-decoration: none;
  color: var(--ink);
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}

.page-about .service-card:hover,
.page-about .service-card:focus-visible {
  transform: translateY(-3px);
  border-top-color: var(--orange);
  box-shadow: var(--shadow-card);
}

.page-about .svc-who {
  margin: 0;
  font-size: .73rem;
  letter-spacing: .1em;
  color: var(--slate);
}

.page-about .service-card h3 {
  margin: 0;
  font-size: .99rem;
  line-height: 1.45;
}

.page-about .service-card p {
  margin: 0;
  flex: 1;
  font-size: .85rem;
  line-height: 1.68;
  color: var(--slate);
}

.page-about .svc-go {
  font-size: .82rem;
  font-weight: 700;
  color: var(--orange);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  width: min(calc(100% - 2rem), var(--content-max));
  margin: 0 auto clamp(2rem, 5vw, 3.5rem);
  padding: clamp(1.3rem, 4vw, 2.6rem) clamp(1rem, 4vw, 2.5rem);
  display: grid;
  gap: 1.2rem;
  background: linear-gradient(120deg, var(--ice-deep), #08303f 62%, var(--pine));
  color: var(--snow);
  border-radius: var(--radius);
}

.page-about .about-cta::after {
  content: "";
  position: absolute;
  right: -50px;
  top: -50px;
  width: 190px;
  height: 190px;
  background: radial-gradient(circle, rgba(255, 106, 26, .34), transparent 70%);
  pointer-events: none;
}

.page-about .cta-copy {
  position: relative;
  z-index: 1;
  max-width: 48ch;
}

.page-about .cta-eyebrow {
  margin: 0 0 .5rem;
  color: var(--orange-soft);
}

.page-about .about-cta h2 {
  margin: 0 0 .6rem;
  font-size: clamp(1.4rem, 3vw, 2rem);
  line-height: 1.2;
  font-weight: 800;
  color: var(--snow);
}

.page-about .cta-copy p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.75;
  color: rgba(247, 251, 254, .82);
}

.page-about .cta-actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  align-content: center;
}

.page-about .about-cta .btn-ghost {
  color: var(--snow);
  border-color: rgba(247, 251, 254, .55);
}

.page-about .about-cta .btn-ghost:hover,
.page-about .about-cta .btn-ghost:focus-visible {
  background: rgba(247, 251, 254, .14);
  border-color: var(--snow);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .gates {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 760px) {
  .page-about .crew {
    grid-template-columns: minmax(150px, 210px) minmax(0, 1fr);
  }
}

@media (min-width: 820px) {
  .page-about .network-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }
}

@media (min-width: 880px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: stretch;
    padding-top: clamp(1rem, 2.6vw, 2.2rem);
  }

  .page-about .hero-media,
  .page-about .hero-media img {
    min-height: 100%;
  }

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

@media (min-width: 1080px) {
  .page-about .about-body {
    grid-template-columns: minmax(180px, 2.6fr) minmax(0, 8fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-space) + 12px);
    align-self: start;
  }

  .page-about .rail-list {
    flex-direction: column;
    overflow: visible;
    gap: .1rem;
  }

  .page-about .rail-list > li > a {
    background: transparent;
    padding: .42rem .1rem;
    border-bottom: 1px solid var(--line);
    border-radius: 0;
  }

  .page-about .rail-list > li > a:hover,
  .page-about .rail-list > li > a:focus-visible {
    background: transparent;
    color: var(--orange);
  }

  .page-about .rail-years {
    display: block;
    list-style: none;
    margin: .3rem 0 .5rem;
    padding: 0 0 0 .8rem;
    border-left: 1px solid var(--line-strong);
  }

  .page-about .rail-years a {
    display: flex;
    gap: .5rem;
    padding: .2rem 0;
    font-size: .77rem;
    color: var(--slate);
    text-decoration: none;
  }

  .page-about .rail-years a .mono {
    color: var(--ice-deep);
  }

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

@media (min-width: 1120px) {
  .page-about .service-cards {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .hero-index a,
  .page-about .crew-item,
  .page-about .service-card,
  .page-about .rail-list > li > a {
    transition: none;
  }

  .page-about .crew-item:hover,
  .page-about .service-card:hover,
  .page-about .service-card:focus-visible {
    transform: none;
  }
}