.page-about {
  background: var(--ink-900);
  color: var(--chalk);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  padding: 22px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mist);
}

.page-about .breadcrumb__item {
  color: var(--mist);
  text-decoration: none;
}

.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin: 0 8px;
  color: var(--line);
}

.page-about a.breadcrumb__item:hover,
.page-about a.breadcrumb__item:focus-visible {
  color: var(--mint);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 34px 0 62px;
  background:
    radial-gradient(circle at 82% 12%, rgba(255, 91, 46, .16) 0%, transparent 46%),
    linear-gradient(168deg, var(--ink-800) 0%, var(--ink-900) 72%);
  border-bottom: 2px solid var(--line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -8%;
  bottom: 0;
  width: 46%;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--alert));
  transform: skewX(-28deg);
  transform-origin: right bottom;
}

.page-about .about-hero__shell {
  display: grid;
  gap: 34px;
}

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

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 6.6vw, 58px);
  line-height: 1.1;
  letter-spacing: -.02em;
  margin: 16px 0 0;
  color: var(--chalk);
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 34em;
  color: var(--mist);
  font-size: 16px;
  line-height: 1.85;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: 30px;
  background: var(--line);
  border: 2px solid var(--line);
}

.page-about .about-hero__fact {
  background: var(--ink-900);
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(24px, 5.4vw, 38px);
  line-height: 1;
  color: var(--mint);
}

.page-about .about-hero__lbl {
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.45;
  color: var(--mist);
  letter-spacing: .04em;
}

.page-about .about-hero__media {
  margin: 0;
  border: 3px solid var(--line);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
  position: relative;
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(200deg, rgba(37, 242, 192, .1) 0%, rgba(7, 19, 15, .5) 100%);
  pointer-events: none;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  filter: saturate(1.06) contrast(1.1) brightness(.82);
}

/* ---------- 公共区块头 ---------- */
.page-about .section-head {
  margin: 0;
}

.page-about .section-head__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--alert);
}

.page-about .section-head__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 4.4vw, 36px);
  line-height: 1.18;
  letter-spacing: -.02em;
  margin: 10px 0 0;
  color: var(--chalk);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  padding: 66px 0 70px;
  border-bottom: 2px solid var(--line);
}

.page-about .about-timeline__intro {
  margin: 22px 0 0;
  max-width: 62ch;
  color: var(--mist);
  font-size: 16px;
  line-height: 1.9;
}

.page-about .about-track {
  list-style: none;
  margin: 40px 0 0;
  padding: 0 0 0 30px;
  position: relative;
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 30px;
  width: 2px;
  background: linear-gradient(180deg, var(--alert) 0%, var(--amber) 34%, var(--line) 100%);
}

.page-about .about-track__item {
  position: relative;
  padding: 0 0 34px;
}

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

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 8px;
  width: 16px;
  height: 16px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--ink-900);
  border: 3px solid var(--alert);
  transition: border-color .25s ease, box-shadow .25s ease;
}

.page-about .about-track__item:last-child::before {
  border-color: var(--mint);
  box-shadow: 0 0 0 4px rgba(37, 242, 192, .16);
}

.page-about .about-track__year {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: .08em;
  color: var(--alert);
}

.page-about .about-track__item:last-child .about-track__year {
  color: var(--mint);
}

.page-about .about-track__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 18px;
  line-height: 1.35;
  margin: 6px 0 0;
  color: var(--chalk);
}

.page-about .about-track__text {
  margin: 8px 0 0;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.8;
  max-width: 42ch;
}

/* ---------- 分隔色带 ---------- */
.page-about .divider-band {
  height: 3px;
  border: 0;
  background: linear-gradient(90deg, var(--mint) 0%, var(--mint-soft) 34%, var(--amber) 68%, var(--alert) 100%);
}

/* ---------- 岗位拼贴 ---------- */
.page-about .about-roles {
  padding: 66px 0 70px;
  background: linear-gradient(200deg, var(--ink-800) 0%, var(--ink-900) 84%);
  border-bottom: 2px solid var(--line);
}

.page-about .about-roles__lead {
  margin: 22px 0 0;
  max-width: 60ch;
  color: var(--mist);
  font-size: 16px;
  line-height: 1.9;
}

.page-about .about-roles__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 34px;
}

.page-about .about-roles__card {
  position: relative;
  background: var(--ink-700);
  border: 2px solid var(--line);
  padding: 22px 20px 20px;
  transition: border-color .25s ease, transform .25s ease, box-shadow .25s ease;
}

.page-about .about-roles__card::before {
  content: "";
  position: absolute;
  top: -2px;
  left: -2px;
  width: 34px;
  height: 4px;
  background: var(--mint);
}

.page-about .about-roles__card:hover,
.page-about .about-roles__card:focus-within {
  border-color: var(--mint);
  transform: translateY(-4px);
  box-shadow: var(--shadow-mint);
}

.page-about .about-roles__n {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 38px;
  line-height: 1;
  color: var(--mint);
}

.page-about .about-roles__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 19px;
  margin: 10px 0 0;
  color: var(--chalk);
}

.page-about .about-roles__desc {
  margin: 0;
  color: var(--mist);
  font-size: 14px;
  line-height: 1.78;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height .38s ease, opacity .3s ease, margin-top .3s ease;
}

.page-about .about-roles__card:hover .about-roles__desc,
.page-about .about-roles__card:focus-within .about-roles__desc {
  max-height: 10em;
  opacity: 1;
  margin-top: 12px;
}

/* ---------- 数据流程 ---------- */
.page-about .about-flow {
  padding: 66px 0 70px;
  border-bottom: 2px solid var(--line);
}

.page-about .about-flow__shell {
  display: grid;
  gap: 34px;
}

.page-about .about-flow__media {
  margin: 0;
  border: 3px solid var(--line);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .about-flow__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  filter: saturate(1.05) contrast(1.1) brightness(.8);
}

.page-about .about-flow__media .media-frame__caption {
  display: block;
  padding: 12px 16px;
  background: var(--ink-700);
  border-top: 2px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .04em;
  color: var(--mist);
}

.page-about .about-flow__list {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  counter-reset: flow;
}

.page-about .about-flow__item {
  counter-increment: flow;
  position: relative;
  padding: 18px 0 18px 58px;
  border-top: 1px solid var(--line);
  transition: background-color .25s ease;
}

.page-about .about-flow__item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-flow__item::before {
  content: counter(flow, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 19px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: .06em;
  color: var(--alert);
}

.page-about .about-flow__item:hover {
  background-color: rgba(37, 242, 192, .045);
}

.page-about .about-flow__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  line-height: 1.4;
  margin: 0;
  color: var(--chalk);
}

.page-about .about-flow__item p {
  margin: 7px 0 0;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 本地节点 ---------- */
.page-about .about-node {
  padding: 66px 0 72px;
  background:
    radial-gradient(circle at 12% 88%, rgba(37, 242, 192, .1) 0%, transparent 44%),
    var(--ink-800);
  border-bottom: 2px solid var(--line);
}

.page-about .about-node__shell {
  display: grid;
  gap: 34px;
}

.page-about .about-node__body p {
  margin: 18px 0 0;
  max-width: 58ch;
  color: var(--mist);
  font-size: 16px;
  line-height: 1.9;
}

.page-about .about-node__facts {
  margin-top: 28px;
  border-top: 2px solid var(--line);
}

.page-about .about-node__fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-node__key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--amber);
}

.page-about .about-node__val {
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.6;
  color: var(--chalk);
  word-break: break-word;
}

.page-about .about-node__media {
  margin: 0;
  border: 3px solid var(--line);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
  align-self: start;
}

.page-about .about-node__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(1.08) contrast(1.12) brightness(.78);
}

/* ---------- 坚持的事 ---------- */
.page-about .about-hold {
  padding: 68px 0 76px;
}

.page-about .about-hold__list {
  margin-top: 32px;
  max-width: 44rem;
}

.page-about .about-hold__item {
  position: relative;
  padding: 4px 0 4px 22px;
  border-left: 5px solid var(--alert);
  margin-bottom: 30px;
}

.page-about .about-hold__item:last-child {
  margin-bottom: 0;
}

.page-about .about-hold__item:nth-child(2) {
  border-left-color: var(--amber);
}

.page-about .about-hold__item:nth-child(3) {
  border-left-color: var(--mint);
}

.page-about .about-hold__item h3 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 19px;
  line-height: 1.4;
  margin: 0;
  color: var(--chalk);
}

.page-about .about-hold__item p {
  margin: 10px 0 0;
  color: var(--mist);
  font-size: 16px;
  line-height: 1.95;
}

.page-about .about-hold__cta {
  margin: 46px 0 0;
  padding: 22px 22px;
  border: 2px solid var(--line);
  border-left: 5px solid var(--mint);
  background: var(--ink-800);
  color: var(--mist);
  font-size: 15px;
  line-height: 1.9;
}

.page-about .about-hold__cta a {
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid rgba(37, 242, 192, .45);
  transition: color .2s ease, border-color .2s ease;
}

.page-about .about-hold__cta a:hover,
.page-about .about-hold__cta a:focus-visible {
  color: var(--mint-soft);
  border-bottom-color: var(--mint-soft);
}

/* ---------- 焦点可见性 ---------- */
.page-about a:focus-visible,
.page-about .about-roles__card:focus-within {
  outline: 2px solid var(--mint);
  outline-offset: 3px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-roles__grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-roles__card:nth-child(1) { grid-column: span 4; }
  .page-about .about-roles__card:nth-child(2) { grid-column: span 2; }
  .page-about .about-roles__card:nth-child(3) { grid-column: span 2; }
  .page-about .about-roles__card:nth-child(4) { grid-column: span 4; }

  .page-about .about-roles__card:nth-child(odd) {
    padding-top: 28px;
  }
}

@media (min-width: 860px) {
  .page-about .about-track {
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: minmax(0, 1fr);
    gap: 26px;
    padding: 34px 0 0;
  }

  .page-about .about-track::before {
    left: 0;
    right: 0;
    top: 7px;
    bottom: auto;
    width: auto;
    height: 2px;
    background: linear-gradient(90deg, var(--alert) 0%, var(--amber) 52%, var(--line) 100%);
  }

  .page-about .about-track__item {
    padding: 0;
  }

  .page-about .about-track__item::before {
    left: 0;
    top: -34px;
  }

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

@media (min-width: 900px) {
  .page-about .breadcrumb {
    padding-top: 26px;
  }

  .page-about .about-hero {
    padding: 44px 0 80px;
  }

  .page-about .about-hero__shell {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 52px;
    align-items: end;
  }

  .page-about .about-hero__media img {
    aspect-ratio: 7 / 6;
  }

  .page-about .about-flow__shell {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-node__shell {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: center;
  }

  .page-about .about-timeline,
  .page-about .about-roles,
  .page-about .about-flow {
    padding-top: 84px;
    padding-bottom: 88px;
  }

  .page-about .about-node {
    padding-top: 84px;
    padding-bottom: 92px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero h1 {
    max-width: 15em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-roles__card,
  .page-about .about-roles__desc,
  .page-about .about-flow__item,
  .page-about .about-hold__cta a {
    transition: none;
  }

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