.page-about {
  --about-indent: clamp(18px, 3vw, 42px);
  position: relative;
  background:
    repeating-linear-gradient(115deg, rgba(0, 229, 255, .035) 0 1px, transparent 1px 104px),
    linear-gradient(180deg, var(--ink) 0%, #101a24 42%, var(--ink) 100%);
  overflow-x: clip;
}

.page-about .about-hero {
  position: relative;
  padding-top: clamp(20px, 4vw, 40px);
  padding-bottom: clamp(32px, 5vw, 56px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -18%;
  right: -12%;
  width: min(720px, 88vw);
  height: 560px;
  background:
    radial-gradient(58% 58% at 68% 32%, rgba(212, 162, 76, .20), transparent 72%),
    linear-gradient(118deg, rgba(0, 229, 255, .13), transparent 62%);
  pointer-events: none;
}

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

.page-about .about-hero__head {
  max-width: 48rem;
  margin-top: clamp(18px, 3vw, 30px);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  font-size: clamp(1.85rem, 5vw, 3.2rem);
  line-height: 1.16;
  color: var(--fog);
  margin: .45rem 0 clamp(14px, 2vw, 20px);
  text-wrap: balance;
}

.page-about .about-hero__lead {
  color: var(--muted);
  max-width: 40em;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(26px, 4vw, 40px) 0 0;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-facts__item {
  background: var(--deep);
  padding: clamp(14px, 2vw, 20px) clamp(14px, 2vw, 22px);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-facts__key {
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--muted);
}

.page-about .about-facts__val {
  font-size: clamp(1.3rem, 3vw, 1.9rem);
  font-weight: 500;
  color: var(--cyan);
  line-height: 1.1;
}

.page-about .about-hero__figure {
  margin: clamp(26px, 4vw, 44px) 0 0;
}

.page-about .about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(34px, 5vw, 62px);
  align-items: start;
}

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

.page-about .about-chapter {
  padding-block: clamp(44px, 6vw, 82px);
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: calc(var(--header-h) + 20px);
}

.page-about .about-chapter:first-child {
  border-top: 0;
}

.page-about .about-chapter__head {
  max-width: 44rem;
  margin-bottom: clamp(22px, 3.5vw, 38px);
}

.page-about .about-chapter h2,
.page-about .about-why__title {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.015em;
  font-size: clamp(1.4rem, 3.1vw, 2.15rem);
  line-height: 1.22;
  color: var(--fog);
  margin: .45rem 0 0;
  text-wrap: balance;
}

.page-about .about-chapter__prose p,
.page-about .about-adapt__prose p,
.page-about .about-credits__prose p {
  color: var(--muted);
  max-width: 40em;
}

.page-about .about-chapter__prose p + p,
.page-about .about-adapt__prose p + p,
.page-about .about-credits__prose p + p {
  margin-top: 1em;
}

/* 服务对象 */
.page-about .about-audience {
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-audience__item {
  position: relative;
  background: var(--deep);
  border: 1px solid var(--line-soft);
  border-top: 2px solid var(--sand);
  padding: 18px 20px 20px;
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
  transition: background-color .18s ease, border-color .18s ease, transform .18s ease;
}

.page-about .about-audience__item:hover,
.page-about .about-audience__item:focus-within {
  background: var(--deep-2);
  border-color: var(--cyan);
  border-top-color: var(--lava);
  transform: translateY(-2px);
}

.page-about .about-audience__no {
  display: block;
  font-size: .78rem;
  letter-spacing: .18em;
  color: var(--violet);
  margin-bottom: 8px;
}

.page-about .about-audience__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--fog);
  line-height: 1.4;
  margin: 0 0 8px;
}

.page-about .about-audience__desc {
  font-size: .9rem;
  color: var(--muted);
  line-height: 1.7;
  margin: 0;
}

/* 版本时间线 */
.page-about .about-track {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0 0 0 var(--about-indent);
  position: relative;
  display: grid;
  gap: 14px;
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 4px;
  bottom: 4px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(0, 229, 255, .08) 100%);
  transform: rotate(2deg);
  transform-origin: 50% 0;
}

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

.page-about .about-track__node {
  position: relative;
  background: var(--deep);
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--graphite);
  padding: 16px 20px 18px;
  transition: background-color .18s ease, border-color .18s ease, transform .18s ease;
}

.page-about .about-track__node::after {
  content: "";
  position: absolute;
  left: -6px;
  top: 24px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
}

.page-about .about-track__node:hover {
  background: var(--deep-2);
  border-color: var(--cyan);
  border-left-color: var(--cyan);
  transform: translateX(4px);
}

.page-about .about-track__node:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
  background: var(--deep-2);
  border-color: var(--cyan);
}

.page-about .about-track__year {
  display: inline-block;
  font-size: .78rem;
  letter-spacing: .16em;
  color: var(--sand);
  border-bottom: 1px solid rgba(212, 162, 76, .45);
  padding-bottom: 2px;
  margin-bottom: 8px;
}

.page-about .about-track__title {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--fog);
  line-height: 1.4;
  margin: 0 0 8px;
}

.page-about .about-track__desc {
  font-size: .92rem;
  color: var(--muted);
  line-height: 1.72;
  margin: 0 0 10px;
  max-width: 40em;
}

.page-about .about-track__meta {
  font-size: .76rem;
  letter-spacing: .04em;
  color: var(--graphite);
  margin: 0;
}

.page-about .about-track__item:last-child .about-track__node {
  border-left-color: var(--lava);
}

.page-about .about-track__item:last-child .about-track__node::after {
  background: var(--lava);
  border-color: var(--lava);
  box-shadow: 0 0 0 4px rgba(255, 107, 26, .18);
}

.page-about .about-track__figure {
  margin: clamp(26px, 4vw, 40px) 0 0;
}

/* 适配能力 */
.page-about .about-adapt {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 42px);
}

.page-about .about-adapt__link {
  margin-top: 1.4em;
}

.page-about .about-adapt__cards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-adapt__card {
  background: var(--deep);
  padding: 18px 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: background-color .18s ease;
}

.page-about .about-adapt__card:hover {
  background: var(--deep-2);
}

.page-about .about-adapt__value {
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  font-weight: 500;
  color: var(--cyan);
  line-height: 1.05;
}

.page-about .about-adapt__unit {
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--cyan-soft);
}

.page-about .about-adapt__card p {
  font-size: .86rem;
  color: var(--muted);
  line-height: 1.68;
  margin: 8px 0 0;
}

/* 团队 */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-about .about-team__cards {
  list-style: none;
  margin: clamp(22px, 3.5vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .about-team__card {
  position: relative;
  background: var(--deep);
  border: 1px solid var(--line-soft);
  border-bottom: 2px solid var(--sand);
  padding: 16px 18px 18px;
  transition: background-color .18s ease, border-color .18s ease, transform .18s ease;
}

.page-about .about-team__card:hover {
  background: var(--deep-2);
  border-color: var(--cyan);
  border-bottom-color: var(--lava);
  transform: translateY(-2px);
}

.page-about .about-team__card:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  background: var(--deep-2);
  border-color: var(--cyan);
}

.page-about .about-team__num {
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--fog);
  margin-right: 10px;
}

.page-about .about-team__role {
  font-size: .8rem;
  letter-spacing: .08em;
  color: var(--cyan-soft);
}

.page-about .about-team__duty {
  font-size: .86rem;
  color: var(--muted);
  line-height: 1.68;
  margin: 8px 0 0;
}

.page-about .about-team__figure {
  margin: 0;
}

/* 资质 */
.page-about .about-credits {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 46px);
}

.page-about .about-credits__badges {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-credits__badge {
  background: transparent;
  border: 1px solid var(--graphite);
  border-top: 1px solid var(--sand);
  padding: 16px 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: border-color .18s ease, background-color .18s ease;
}

.page-about .about-credits__badge:hover {
  border-color: var(--sand);
  background: rgba(212, 162, 76, .05);
}

.page-about .about-credits__badge--wide {
  grid-column: 1 / -1;
}

.page-about .about-credits__badge-name {
  font-size: 1rem;
  font-weight: 500;
  color: var(--sand);
  letter-spacing: .04em;
}

.page-about .about-credits__badge-note {
  font-size: .84rem;
  color: var(--muted);
  line-height: 1.65;
}

/* 结论 */
.page-about .about-why__lead {
  color: var(--muted);
  max-width: 42em;
  margin-top: clamp(14px, 2vw, 20px);
}

.page-about .about-why__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3.5vw, 34px);
}

/* 右侧变更栏 */
.page-about .about-rail {
  min-width: 0;
  background: var(--deep);
  border: 1px solid var(--line-soft);
  border-top: 2px solid var(--cyan);
  padding: 20px 20px 22px;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-rail__item {
  padding-bottom: 14px;
  border-bottom: 1px dashed var(--line-soft);
}

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

.page-about .about-rail__ver {
  font-size: .8rem;
  color: var(--fog);
  margin-right: 8px;
}

.page-about .about-rail__text {
  font-size: .86rem;
  color: var(--muted);
  line-height: 1.7;
  margin: 8px 0 6px;
}

.page-about .about-rail__scope {
  font-size: .72rem;
  letter-spacing: .04em;
  color: var(--graphite);
  margin: 0;
}

.page-about .about-rail__more {
  display: inline-block;
  margin-top: 16px;
  font-size: .86rem;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, .4);
  padding-bottom: 2px;
  transition: color .18s ease, border-color .18s ease;
}

.page-about .about-rail__more:hover {
  color: var(--cyan-soft);
  border-color: var(--cyan-soft);
}

.page-about .about-rail__more:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* 响应式 */
@media (min-width: 600px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-adapt,
  .page-about .about-credits {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  }

  .page-about .about-adapt__prose {
    order: 1;
  }

  .page-about .about-adapt__cards {
    order: 2;
  }
}

@media (min-width: 1080px) {
  .page-about .about-grid {
    grid-template-columns: minmax(0, 1fr) minmax(292px, 336px);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 22px);
    align-self: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-audience__item,
  .page-about .about-track__node,
  .page-about .about-team__card {
    transition: none;
  }

  .page-about .about-track::before {
    transform: none;
  }
}