.page-about {
  --about-rail: 118px;
  --about-gap: clamp(20px, 3vw, 40px);
  display: block;
  overflow-wrap: break-word;
}

.page-about .about-hero {
  padding-top: clamp(22px, 4vw, 56px);
}

.page-about .breadcrumb {
  margin-bottom: clamp(22px, 4vw, 44px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 5vw, 56px);
  align-items: end;
}

.page-about .about-hero__kicker {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--lime);
}

.page-about .about-hero__title {
  margin: 0 0 clamp(16px, 2.6vw, 26px);
  max-width: 14em;
  font-family: var(--font-display);
  font-size: clamp(34px, 6.4vw, 76px);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--white);
}

.page-about .about-hero__text {
  margin: 0 0 clamp(22px, 3vw, 32px);
  max-width: 38em;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__stat {
  position: relative;
  padding: clamp(22px, 3vw, 32px);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-lg);
  background:
    radial-gradient(120% 120% at 88% 6%, rgba(198, 255, 74, .14), rgba(198, 255, 74, 0) 58%),
    linear-gradient(160deg, rgba(12, 27, 51, .94), rgba(16, 36, 28, .94));
}

.page-about .about-hero__stat::after {
  content: "";
  position: absolute;
  right: clamp(18px, 3vw, 30px);
  top: clamp(18px, 3vw, 30px);
  width: 46px;
  height: 46px;
  border-top: 2px solid rgba(198, 255, 74, .55);
  border-right: 2px solid rgba(198, 255, 74, .55);
  border-radius: 0 12px 0 0;
  pointer-events: none;
}

/* 章节轨道 */
.page-about .about-rail {
  position: sticky;
  top: 74px;
  z-index: 6;
  display: flex;
  gap: 8px;
  margin-bottom: clamp(10px, 2vw, 20px);
  padding: 12px 0;
  overflow-x: auto;
  border-bottom: 1px solid var(--line-soft);
  background: linear-gradient(180deg, rgba(6, 23, 15, .96) 60%, rgba(6, 23, 15, 0));
  backdrop-filter: blur(6px);
  scrollbar-width: none;
}

.page-about .about-rail::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail a {
  flex: 0 0 auto;
  padding: 8px 13px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--text);
  text-decoration: none;
  transition: color .24s var(--ease), background-color .24s var(--ease), border-color .24s var(--ease);
}

.page-about .about-rail a:hover,
.page-about .about-rail a:focus-visible {
  color: var(--ink);
  background: var(--lime);
  border-color: var(--lime);
}

/* 章节骨架 */
.page-about .about-ch {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 3vw, 30px);
  padding: clamp(40px, 6vw, 84px) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-ch__aside {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-ch__num {
  font-family: var(--font-display);
  font-size: clamp(42px, 8vw, 100px);
  font-weight: 200;
  line-height: .88;
  letter-spacing: -.04em;
  color: rgba(198, 255, 74, .16);
}

.page-about .about-ch__kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--text);
}

.page-about .about-ch__title {
  margin: 0 0 clamp(14px, 2.2vw, 22px);
  max-width: 20em;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.4vw, 40px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .about-ch__body > p {
  margin: 0 0 16px;
  max-width: 40em;
  font-size: clamp(15.5px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--text);
}

/* 图片容器 */
.page-about .about-media {
  margin: 0 0 clamp(20px, 3vw, 30px);
  overflow: hidden;
  border-radius: var(--r-lg);
}

.page-about .about-media--tuck {
  margin: clamp(24px, 4vw, 40px) 0 0;
}

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

/* 栏目错落卡片 */
.page-about .about-cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-col {
  position: relative;
  overflow: hidden;
  padding: clamp(18px, 2.2vw, 26px);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: var(--panel);
  transition: transform .3s var(--ease), border-color .3s var(--ease);
}

.page-about .about-col::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: linear-gradient(180deg, var(--lime), rgba(198, 255, 74, 0));
  opacity: .75;
}

.page-about .about-col:hover {
  transform: translateY(-4px);
  border-color: rgba(198, 255, 74, .34);
}

.page-about .about-col__tag {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--lime);
}

.page-about .about-col__name {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-col__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
}

/* 团队 */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-team__card {
  padding: 20px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-sm);
  background: linear-gradient(180deg, rgba(16, 36, 28, .95), rgba(12, 27, 51, .9));
}

.page-about .about-team__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 34px;
  line-height: 1;
  color: var(--lime);
  letter-spacing: .02em;
}

.page-about .about-team__unit {
  margin-left: 5px;
  font-size: 13px;
  color: var(--text);
}

.page-about .about-team__name {
  margin: 12px 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-team__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--text);
}

.page-about .about-relay {
  margin-top: 18px;
  padding: clamp(18px, 2.4vw, 26px);
}

.page-about .about-relay__line {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text);
  border-left: 2px solid rgba(63, 208, 142, .6);
  padding-left: 16px;
}

/* 时间轴 */
.page-about .about-tl {
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tl__item {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-tl__node {
  position: relative;
  display: flex;
  justify-content: center;
  padding-top: 22px;
}

.page-about .about-tl__dot {
  width: 12px;
  height: 12px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(243, 178, 63, .14);
}

.page-about .about-tl__node::after {
  content: "";
  position: absolute;
  top: 36px;
  bottom: 0;
  width: 1px;
  background: var(--line);
}

.page-about .about-tl__item:last-child .about-tl__node::after {
  display: none;
}

.page-about .about-tl__card {
  margin-bottom: 16px;
  padding: 16px 18px 20px;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  background: rgba(16, 36, 28, .6);
  transition: background-color .3s var(--ease), border-color .3s var(--ease), transform .3s var(--ease);
}

.page-about .about-tl__card:hover,
.page-about .about-tl__card:focus-within {
  transform: translateX(4px);
  border-color: rgba(243, 178, 63, .42);
  background: rgba(16, 36, 28, .96);
}

.page-about .about-tl__stage {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-about .about-tl__title {
  margin: 8px 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-tl__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text);
}

/* 产出流程 */
.page-about .about-flow {
  counter-reset: flow;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-flow__item {
  position: relative;
  padding: 18px 18px 18px 62px;
  border-radius: var(--r-sm);
  border-left: 2px solid rgba(198, 255, 74, .4);
  background: rgba(12, 27, 51, .72);
}

.page-about .about-flow__item::before {
  counter-increment: flow;
  content: "0" counter(flow);
  position: absolute;
  left: 18px;
  top: 17px;
  font-family: var(--font-mono);
  font-size: 20px;
  letter-spacing: .02em;
  color: var(--lime);
}

.page-about .about-flow__title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-flow__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text);
}

/* 开放与反馈 */
.page-about .about-open {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-open__card {
  padding: clamp(20px, 2.4vw, 28px);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: linear-gradient(150deg, rgba(12, 27, 51, .92), rgba(16, 36, 28, .86));
}

.page-about .about-open__card h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-open__card p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-open__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

@media (min-width: 720px) {
  .page-about .about-cols {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .about-col--wide {
    grid-column: span 4;
  }

  .page-about .about-col--narrow {
    grid-column: span 2;
  }

  .page-about .about-col--half {
    grid-column: span 3;
  }

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

@media (min-width: 900px) {
  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 940px) {
  .page-about .about-ch {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
  }

  .page-about .about-ch__aside {
    position: sticky;
    top: 132px;
    align-self: start;
    flex-direction: column;
    gap: 6px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-col,
  .page-about .about-tl__card,
  .page-about .about-rail a {
    transition: none;
  }

  .page-about .about-col:hover,
  .page-about .about-tl__card:hover,
  .page-about .about-tl__card:focus-within {
    transform: none;
  }
}