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

.page-about .about-band {
  padding: 54px 0;
}

.page-about .about-band--ink {
  background: var(--ink);
}

.page-about .about-band--obsidian {
  background: var(--obsidian);
  border-top: 1px solid var(--hair-soft);
  border-bottom: 1px solid var(--hair-soft);
}

.page-about .about-band--umber {
  background: var(--umber);
}

/* ---------- hero ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: 30px 0 46px;
  border-bottom: 1px solid var(--hair-soft);
}

.page-about .about-hero__img {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 34%;
  opacity: .46;
}

.page-about .about-hero__veil {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(120% 78% at 88% 0%, rgba(201, 168, 106, .18), transparent 62%),
    linear-gradient(180deg, rgba(10, 10, 12, .62) 0%, rgba(10, 10, 12, .9) 58%, var(--ink) 100%);
}

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

.page-about .about-hero .eyebrow {
  margin: 26px 0 14px;
  color: var(--gold);
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(34px, 8.4vw, 68px);
  line-height: 1.14;
  letter-spacing: .01em;
  color: var(--gold-light);
}

.page-about .about-hero__lead {
  max-width: 46ch;
  margin: 20px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 22px;
  margin-top: 30px;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-left: 14px;
  border-left: 1px solid var(--hair);
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 600;
  color: var(--gold);
  letter-spacing: .02em;
}

.page-about .about-stat__label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--smoke);
  max-width: 14em;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

/* ---------- 起点 ---------- */

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

.page-about .about-origin .section-title,
.page-about .about-head .section-title {
  margin: 8px 0 18px;
}

.page-about .about-origin__text p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--silver);
}

.page-about .about-origin__side {
  padding: 22px;
  border-radius: var(--radius-md);
  border: 1px solid var(--hair-soft);
  background: linear-gradient(160deg, rgba(201, 168, 106, .10), rgba(20, 20, 26, .6));
}

.page-about .about-origin__quote {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: 19px;
  line-height: 1.65;
  color: var(--gold-light);
}

.page-about .about-origin__note {
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--smoke);
}

.page-about .about-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid var(--hair);
  padding-bottom: 3px;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--gold-light);
  border-color: var(--gold-light);
}

/* ---------- 章节头 ---------- */

.page-about .about-head {
  max-width: 62ch;
  margin-bottom: 26px;
}

.page-about .about-head .eyebrow {
  color: var(--gold);
}

.page-about .about-head__lead {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--smoke);
}

/* ---------- 阶段跳转 ---------- */

.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 30px;
  padding: 0;
  list-style: none;
}

.page-about .about-jump a {
  display: inline-block;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--hair);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--silver);
  text-decoration: none;
  transition: background .25s var(--ease), color .25s var(--ease), border-color .25s var(--ease);
}

.page-about .about-jump a:hover,
.page-about .about-jump a:focus-visible {
  background: rgba(201, 168, 106, .12);
  border-color: var(--gold);
  color: var(--gold-light);
}

/* ---------- 时间线 ---------- */

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

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 28px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold), rgba(201, 168, 106, .18));
}

.page-about .about-node {
  position: relative;
  padding-bottom: 30px;
}

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

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 10px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--obsidian);
  border: 1px solid var(--gold);
  box-shadow: 0 0 0 4px rgba(201, 168, 106, .10);
}

.page-about .about-node__idx {
  position: absolute;
  top: -6px;
  right: 0;
  font-family: var(--font-mono);
  font-size: 46px;
  font-weight: 600;
  line-height: 1;
  color: rgba(201, 168, 106, .13);
  pointer-events: none;
}

.page-about .about-node__body {
  position: relative;
  padding: 18px 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--hair-soft);
  background: rgba(20, 20, 26, .72);
  transition: border-color .3s var(--ease), box-shadow .3s var(--ease), transform .3s var(--ease);
}

.page-about .about-node__body:hover,
.page-about .about-node__body:focus-within {
  border-color: var(--hair);
  box-shadow: 0 16px 34px -22px var(--shadow-gold);
  transform: translateY(-2px);
}

.page-about .about-node__year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--gold);
}

.page-about .about-node__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--gold-light);
}

.page-about .about-node__say {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--silver);
}

.page-about .about-node__facts {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .about-node__facts li {
  position: relative;
  padding-left: 16px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--smoke);
}

.page-about .about-node__facts li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 1px;
  background: var(--gold);
}

/* ---------- 旁注 ---------- */

.page-about .about-aside {
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-about .about-aside__card {
  padding: 22px;
  border-radius: var(--radius-md);
  border: 1px solid var(--hair);
  background: linear-gradient(165deg, rgba(201, 168, 106, .12), rgba(10, 10, 12, .5));
}

.page-about .about-aside__card .eyebrow {
  color: var(--gold);
  margin: 0 0 14px;
}

.page-about .about-aside__list {
  margin: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-aside__row {
  display: grid;
  gap: 3px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--hair-soft);
}

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

.page-about .about-aside__row dt {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--smoke);
}

.page-about .about-aside__row dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--silver);
}

.page-about .about-aside__mono {
  font-family: var(--font-mono);
  font-size: 17px !important;
  font-weight: 600;
  color: var(--gold-light) !important;
  letter-spacing: .04em;
}

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--hair-soft);
  background: var(--umber);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 10 / 7;
}

.page-about .about-figure figcaption {
  padding: 12px 16px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--smoke);
  border-top: 1px solid var(--hair-soft);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  display: grid;
  gap: 26px;
}

.page-about .about-bar {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 6px 12px;
  padding: 16px 0;
  border-bottom: 1px solid var(--hair-soft);
}

.page-about .about-bar:first-child {
  border-top: 1px solid var(--hair-soft);
}

.page-about .about-bar__name {
  font-size: 15px;
  font-weight: 600;
  color: var(--gold-light);
}

.page-about .about-bar__num {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--gold);
}

.page-about .about-bar__track {
  grid-column: 1 / -1;
  display: block;
  height: 8px;
  border-radius: var(--radius-pill);
  background: rgba(201, 168, 106, .14);
  overflow: hidden;
}

.page-about .about-bar__fill {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--gold-deep), var(--gold));
}

.page-about .about-bar--ops .about-bar__fill { width: 26.7%; }
.page-about .about-bar--eng .about-bar__fill { width: 40%; }
.page-about .about-bar--care .about-bar__fill { width: 22.2%; }
.page-about .about-bar--gov .about-bar__fill { width: 11.1%; }

.page-about .about-bar__desc {
  grid-column: 1 / -1;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--smoke);
}

.page-about .about-team__foot {
  margin: 26px 0 0;
  padding: 14px 18px;
  border-left: 2px solid var(--cinnabar);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: rgba(206, 70, 51, .07);
  font-size: 14px;
  line-height: 1.8;
  color: var(--silver);
}

/* ---------- 统一路径 ---------- */

.page-about .about-path {
  display: grid;
  gap: 26px;
}

.page-about .about-path__main p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--silver);
}

.page-about .about-path__main .eyebrow {
  color: var(--gold);
}

.page-about .about-path__compare {
  display: grid;
  gap: 14px;
}

.page-about .about-path__panel {
  padding: 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--hair-soft);
  background: rgba(10, 10, 12, .34);
}

.page-about .about-path__panel--after {
  border-color: var(--hair);
  background: linear-gradient(150deg, rgba(201, 168, 106, .14), rgba(10, 10, 12, .4));
}

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

.page-about .about-path__panel--after .about-path__tag {
  color: var(--gold);
}

.page-about .about-path__panel ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 9px;
}

.page-about .about-path__panel li {
  position: relative;
  padding-left: 15px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--silver);
}

.page-about .about-path__panel li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 1px;
  background: var(--gold);
}

/* ---------- 规模 ---------- */

.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.page-about .about-metric {
  padding: 20px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--hair-soft);
  background: var(--obsidian);
}

.page-about .about-metric__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 8vw, 40px);
  font-weight: 600;
  line-height: 1;
  color: var(--gold);
  letter-spacing: .01em;
}

.page-about .about-metric__num small {
  font-size: .5em;
  margin-left: 2px;
}

.page-about .about-metric__unit {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--gold-light);
}

.page-about .about-metric p {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--smoke);
}

/* ---------- 品质 ---------- */

.page-about .about-quality {
  display: grid;
  gap: 26px;
}

.page-about .about-quality__text p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--silver);
}

.page-about .about-quality__text .eyebrow {
  color: var(--gold);
}

.page-about .about-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
  counter-reset: step;
}

.page-about .about-steps li {
  position: relative;
  padding: 18px 20px 18px 58px;
  border-radius: var(--radius-md);
  border: 1px solid var(--hair-soft);
  background: rgba(10, 10, 12, .4);
}

.page-about .about-steps__idx {
  position: absolute;
  left: 18px;
  top: 18px;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  color: var(--cinnabar);
  letter-spacing: .04em;
}

.page-about .about-steps__title {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 600;
  color: var(--gold-light);
}

.page-about .about-steps__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--smoke);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  display: grid;
  gap: 22px;
  padding: 26px 22px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--hair);
  background:
    radial-gradient(120% 130% at 100% 0%, rgba(206, 70, 51, .16), transparent 58%),
    linear-gradient(150deg, rgba(201, 168, 106, .12), rgba(20, 20, 26, .8));
}

.page-about .about-cta__text .eyebrow {
  color: var(--gold);
  margin: 0 0 10px;
}

.page-about .about-cta__text .section-title {
  margin: 0 0 12px;
}

.page-about .about-cta__text p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--silver);
}

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

.page-about .about-backtop {
  margin: 26px 0 0;
  text-align: right;
}

.page-about .about-backtop a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--smoke);
  text-decoration: none;
  transition: color .25s var(--ease);
}

.page-about .about-backtop a:hover,
.page-about .about-backtop a:focus-visible {
  color: var(--gold-light);
}

/* ---------- 桌面 ---------- */

@media (min-width: 820px) {
  .page-about .about-band {
    padding: 76px 0;
  }

  .page-about .about-hero {
    padding: 40px 0 70px;
  }

  .page-about .about-hero__lead {
    font-size: 17px;
  }

  .page-about .about-hero__stats {
    gap: 0;
    margin-top: 38px;
  }

  .page-about .about-stat {
    padding: 0 30px;
  }

  .page-about .about-stat:first-child {
    padding-left: 14px;
  }

  .page-about .about-origin {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-track {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 54px;
    align-items: start;
  }

  .page-about .about-aside {
    position: sticky;
    top: 92px;
  }

  .page-about .about-node__title {
    font-size: 22px;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-path {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-path__compare {
    gap: 16px;
  }

  .page-about .about-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-quality {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1.4fr) auto;
    align-items: center;
    gap: 34px;
    padding: 40px 40px;
  }

  .page-about .about-cta__actions {
    flex-direction: column;
    align-items: stretch;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero h1 {
    letter-spacing: .015em;
  }

  .page-about .about-node__body {
    padding: 22px 26px;
  }
}