.page-about {
  --about-hair: rgba(185, 194, 212, .2);
  --about-dark: #16181F;
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(22px, 5vw, 52px) 0 clamp(30px, 5vw, 56px);
  border-bottom: 1px solid var(--ink);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(122, 92, 240, .24), transparent 58%),
    linear-gradient(168deg, var(--void) 0%, var(--void) 58%, var(--ink) 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -14%;
  top: -30%;
  width: 42%;
  height: 170%;
  pointer-events: none;
  background: linear-gradient(90deg, transparent, rgba(255, 107, 44, .18));
  transform: skewX(-12deg);
}

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

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 12.5px;
  color: var(--gray);
  margin-bottom: 20px;
}

.page-about .breadcrumb a {
  color: var(--gray);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .16s ease, border-color .16s ease;
}

.page-about .breadcrumb a:hover {
  color: var(--orange-soft);
  border-color: var(--orange-soft);
}

.page-about .breadcrumb__sep {
  color: rgba(185, 194, 212, .45);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 26px;
  align-items: start;
}

.page-about .about-hero h1 {
  margin: 10px 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 6.4vw, 56px);
  line-height: 1.1;
  letter-spacing: -.5px;
  color: var(--white);
  text-wrap: balance;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--text);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* 首屏版本纸卡 */
.page-about .about-plate {
  position: relative;
  padding: 30px 22px 22px;
  background: var(--paper);
  color: var(--about-dark);
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  box-shadow: 6px 6px 0 rgba(5, 8, 15, .92);
}

.page-about .about-plate::before {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 46%;
  height: 6px;
  background: var(--orange);
  border-bottom-right-radius: var(--radius);
}

.page-about .about-plate__tag {
  position: absolute;
  top: -11px;
  left: 20px;
  padding: 2px 9px;
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--void);
  background: var(--orange);
  border-radius: 3px;
}

.page-about .about-plate__code {
  margin: 0;
  font-size: clamp(34px, 8vw, 46px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--void);
}

.page-about .about-plate__batch {
  margin: 8px 0 18px;
  font-size: 13px;
  letter-spacing: .06em;
  color: #4A5060;
}

.page-about .about-plate__list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: 0;
}

.page-about .about-plate__list div {
  border-top: 1px solid rgba(22, 24, 31, .22);
  padding-top: 8px;
}

.page-about .about-plate__list dt {
  font-size: 11.5px;
  color: #5A5F70;
}

.page-about .about-plate__list dd {
  margin: 4px 0 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--void);
}

/* ---------- 通用标题 ---------- */
.page-about .about-head {
  margin-bottom: 4px;
}

.page-about .about-head__title {
  margin: 6px 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 4.4vw, 34px);
  line-height: 1.22;
  letter-spacing: -.4px;
  color: var(--white);
  text-wrap: balance;
}

.page-about .about-head__note {
  margin: 0;
  max-width: 58ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--gray);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  padding-top: clamp(36px, 6vw, 64px);
  background: linear-gradient(180deg, var(--ink) 0%, var(--void) 20%, var(--void) 100%);
}

.page-about .timeline {
  position: relative;
  margin-top: 22px;
  padding-bottom: 44px;
}

.page-about .timeline__glow {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: auto;
  max-width: none;
  opacity: .3;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(180deg, transparent, #000 16%, #000 74%, transparent);
  mask-image: linear-gradient(180deg, transparent, #000 16%, #000 74%, transparent);
}

.page-about .timeline__list {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
  list-style: none;
}

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

.page-about .tl-node {
  min-width: 0;
  background: var(--void-2);
  border: 1px solid var(--ink);
  border-left: 3px solid var(--orange);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}

.page-about .tl-node[open] {
  border-left-color: var(--lime);
  box-shadow: 0 14px 28px rgba(5, 8, 15, .6);
}

.page-about .tl-node__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 7px 10px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .tl-node__head::-webkit-details-marker {
  display: none;
}

.page-about .tl-node__head:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: -3px;
}

.page-about .tl-node__dot {
  width: 9px;
  height: 9px;
  flex: none;
  border-radius: 2px;
  background: var(--orange);
  box-shadow: 0 0 0 3px rgba(255, 107, 44, .16);
}

.page-about .tl-node[open] .tl-node__dot {
  background: var(--lime);
  box-shadow: 0 0 0 3px rgba(166, 242, 92, .18);
}

.page-about .tl-node__year {
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--gray);
}

.page-about .tl-node__ver {
  padding: 1px 7px;
  font-size: 11.5px;
  letter-spacing: .04em;
  color: var(--orange);
  border: 1px solid rgba(255, 107, 44, .45);
  border-radius: 3px;
}

.page-about .tl-node__title {
  flex: 1 1 150px;
  min-width: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.35;
  letter-spacing: -.2px;
  color: var(--white);
}

.page-about .tl-node__body {
  margin: 0 16px;
  padding: 12px 0 16px;
  border-top: 1px dashed var(--about-hair);
  font-size: 14px;
  line-height: 1.78;
  color: var(--gray);
}

.page-about .tl-node__body p {
  margin: 0 0 8px;
}

.page-about .tl-node__body p:last-child {
  margin-bottom: 0;
}

/* ---------- 认证与备案 ---------- */
.page-about .about-cert {
  padding: clamp(36px, 6vw, 64px) 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  background:
    radial-gradient(90% 70% at 12% 20%, rgba(47, 128, 255, .14), transparent 62%),
    var(--void);
}

.page-about .about-cert__grid {
  display: grid;
  gap: 28px;
  margin-top: 26px;
}

.page-about .about-cert__figure {
  margin: 0;
  max-width: 380px;
}

.page-about .about-cert__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--ink);
  background: var(--void-2);
}

.page-about .about-cert__cards {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
}

.page-about .cert-card {
  position: relative;
  padding: 18px 20px 20px;
  background: var(--paper);
  color: var(--about-dark);
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  box-shadow: 5px 5px 0 rgba(5, 8, 15, .88);
  transition: transform .2s ease, box-shadow .2s ease;
}

.page-about .cert-card::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 56px;
  height: 5px;
  background: var(--orange);
  border-top-right-radius: var(--radius);
}

.page-about .cert-card__label {
  display: inline-block;
  padding: 1px 7px;
  font-size: 11px;
  letter-spacing: .08em;
  color: #5A5F70;
  border: 1px solid rgba(22, 24, 31, .3);
  border-radius: 3px;
}

.page-about .cert-card__value {
  margin: 10px 0 8px;
  font-size: clamp(19px, 4.4vw, 26px);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: .01em;
  color: var(--void);
  overflow-wrap: anywhere;
}

.page-about .cert-card__note {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: #3A3F4F;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: clamp(36px, 6vw, 64px) 0;
  background: linear-gradient(180deg, var(--void) 0%, var(--void-2) 130%);
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: 26px;
}

.page-about .team-card {
  position: relative;
  min-width: 0;
  padding: 22px 20px;
  background: rgba(10, 16, 38, .72);
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  transition: border-color .18s ease, transform .18s ease;
}

.page-about .team-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 20px;
  width: 34px;
  height: 3px;
  background: var(--blue);
}

.page-about .team-card--wide::before {
  background: var(--lime);
}

.page-about .team-card__no {
  display: block;
  font-size: 12px;
  letter-spacing: .12em;
  color: rgba(185, 194, 212, .6);
}

.page-about .team-card__title {
  margin: 8px 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: -.2px;
  color: var(--white);
}

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

.page-about .team-card__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  margin: 16px 0 0;
}

.page-about .team-card__links a {
  font-size: 13.5px;
  color: var(--orange-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 154, 94, .45);
  padding-bottom: 1px;
  transition: color .16s ease, border-color .16s ease;
}

.page-about .team-card__links a:hover {
  color: var(--white);
  border-color: var(--white);
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-reach {
  padding: clamp(36px, 6vw, 64px) 0;
  border-top: 1px solid var(--ink);
  background: var(--void);
}

.page-about .about-reach__grid {
  display: grid;
  gap: 26px;
  margin-top: 26px;
}

.page-about .about-reach__figure {
  margin: 0;
  min-width: 0;
}

.page-about .about-reach__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  background: var(--void-2);
}

.page-about .about-reach__points {
  display: flex;
  flex-direction: column;
  gap: 18px;
  min-width: 0;
}

.page-about .reach-point {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--about-hair);
}

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

.page-about .reach-point__num {
  font-size: 26px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--orange);
  letter-spacing: -.02em;
}

.page-about .reach-point__num small {
  font-size: 13px;
  color: var(--orange-soft);
  margin-left: 1px;
}

.page-about .reach-point__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16px;
  letter-spacing: -.1px;
  color: var(--white);
}

.page-about .reach-point p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--gray);
}

/* ---------- 数据看板 ---------- */
.page-about .about-board {
  padding: clamp(36px, 6vw, 64px) 0;
  background: linear-gradient(180deg, var(--ink) 0%, var(--void) 55%, var(--void) 100%);
}

.page-about .board-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 26px;
  background: var(--about-hair);
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .board-cell {
  position: relative;
  min-width: 0;
  padding: 20px 16px 18px;
  background: var(--void-2);
}

.page-about .board-cell--scale {
  padding-bottom: 34px;
}

.page-about .board-cell--scale::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 14px;
  height: 8px;
  background-image: repeating-linear-gradient(90deg, rgba(185, 194, 212, .38) 0 1px, transparent 1px 8px);
}

.page-about .board-num {
  display: block;
  font-size: clamp(26px, 5.4vw, 34px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--white);
}

.page-about .board-num small {
  margin-left: 2px;
  font-size: 13px;
  font-weight: 500;
  color: var(--gray);
}

.page-about .board-label {
  margin: 8px 0 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--gray);
}

.page-about .board-cell .data-bar {
  margin-top: 14px;
}

/* ---------- 结尾指路 ---------- */
.page-about .about-next {
  padding: clamp(32px, 5vw, 52px) 0 clamp(40px, 6vw, 64px);
  border-top: 1px solid var(--ink);
  background: var(--ink);
}

.page-about .about-next__inner {
  display: grid;
  gap: 24px;
}

.page-about .about-next__title {
  margin: 6px 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 4.2vw, 30px);
  line-height: 1.25;
  letter-spacing: -.3px;
  color: var(--white);
}

.page-about .about-next__text {
  margin: 0;
  max-width: 58ch;
  font-size: 14px;
  line-height: 1.78;
  color: var(--gray);
}

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

.page-about .about-next__links a {
  display: inline-block;
  padding: 9px 16px;
  font-size: 13.5px;
  color: var(--text);
  text-decoration: none;
  border: 1px solid rgba(185, 194, 212, .3);
  border-radius: 4px;
  transition: color .16s ease, background-color .16s ease, border-color .16s ease, transform .16s ease;
}

.page-about .about-next__links a:hover {
  color: var(--void);
  background: var(--orange);
  border-color: var(--orange);
  transform: translateY(-2px);
}

/* ---------- 悬停态 ---------- */
@media (hover: hover) {
  .page-about .tl-node:hover {
    transform: translateY(-2px);
    border-color: var(--orange-soft);
  }

  .page-about .cert-card:hover {
    transform: translateY(-6px);
    box-shadow: 8px 11px 0 rgba(5, 8, 15, .88);
  }

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

/* ---------- 平板 ---------- */
@media (min-width: 620px) {
  .page-about .cert-card:nth-child(2) {
    margin-left: 24px;
  }

  .page-about .cert-card:nth-child(3) {
    margin-left: 48px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .82fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-plate {
    margin-top: 34px;
  }

  .page-about .timeline__item {
    width: 42%;
  }

  .page-about .timeline__item:nth-child(1) { margin-left: 0; }
  .page-about .timeline__item:nth-child(2) { margin-left: 9%; }
  .page-about .timeline__item:nth-child(3) { margin-left: 18%; }
  .page-about .timeline__item:nth-child(4) { margin-left: 27%; }
  .page-about .timeline__item:nth-child(5) { margin-left: 36%; }
  .page-about .timeline__item:nth-child(6) { margin-left: 45%; }
  .page-about .timeline__item:nth-child(7) { margin-left: 54%; }

  .page-about .timeline__list {
    gap: 10px;
  }

  .page-about .about-cert__grid {
    grid-template-columns: minmax(0, .72fr) minmax(0, 1.28fr);
    gap: 44px;
    align-items: center;
  }

  .page-about .about-cert__figure {
    max-width: none;
  }

  .page-about .team-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .team-card:nth-child(1) { grid-column: span 3; }
  .page-about .team-card:nth-child(2) { grid-column: span 3; }
  .page-about .team-card--wide { grid-column: span 6; }

  .page-about .about-reach__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 40px;
    align-items: center;
  }

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

  .page-about .board-cell {
    padding: 24px 20px 22px;
  }

  .page-about .board-cell--scale {
    padding-bottom: 40px;
  }

  .page-about .board-cell--scale::after {
    left: 20px;
    right: 20px;
  }

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 32px;
  }

  .page-about .about-next__links {
    justify-content: flex-end;
    max-width: 340px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero {
    padding-top: 64px;
  }
}