.page-about {
  --about-hair: rgba(14, 27, 42, .12);
  --about-dash: rgba(180, 118, 47, .45);
  --about-rock-hair: rgba(126, 147, 168, .28);
  --about-paper: #FBF7F0;
  background: var(--hf-sand);
  color: var(--hf-fg);
  overflow-x: hidden;
}

/* ---------- 封面 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  background: linear-gradient(168deg, #0E1B2A 0%, #1B2F45 58%, #14263A 100%);
  color: var(--hf-sand);
  padding: clamp(84px, 13vh, 148px) 0 clamp(52px, 8vh, 88px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  background-image:
    repeating-linear-gradient(115deg, rgba(126, 147, 168, .10) 0 1px, transparent 1px 46px),
    repeating-linear-gradient(65deg, rgba(126, 147, 168, .055) 0 1px, transparent 1px 72px);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  right: -14%;
  top: -26%;
  width: 62%;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(180, 118, 47, .26), rgba(180, 118, 47, 0) 68%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  display: grid;
  gap: var(--hf-space-5);
  align-items: end;
}

.page-about .about-hero__crumb {
  margin: 0 0 var(--hf-space-4);
  color: rgba(243, 237, 227, .58);
  font-size: var(--hf-fs-index);
}

.page-about .about-hero__crumb .hf-breadcrumb__link {
  color: rgba(243, 237, 227, .74);
  text-decoration: none;
}

.page-about .about-hero__crumb .hf-breadcrumb__link:hover {
  color: var(--hf-copper-mist);
}

.page-about .about-hero__crumb .hf-breadcrumb__sep {
  color: rgba(243, 237, 227, .38);
}

.page-about .about-hero__crumb .hf-breadcrumb__current {
  color: var(--hf-copper-mist);
}

.page-about .about-hero__title {
  margin: 0;
  font-weight: 200;
  font-size: clamp(2.35rem, 6vw, 4.5rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--hf-sand);
  max-width: 18em;
}

.page-about .about-hero__lead {
  margin: var(--hf-space-4) 0 0;
  font-size: var(--hf-fs-lead);
  line-height: 1.8;
  color: rgba(243, 237, 227, .78);
  max-width: 36em;
}

.page-about .about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--hf-space-3) var(--hf-space-5);
  margin-top: var(--hf-space-5);
  padding-top: var(--hf-space-4);
  border-top: 1px solid rgba(232, 201, 160, .28);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 120px;
}

.page-about .about-stat__num {
  font-family: var(--hf-font-mono);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--hf-copper-mist);
}

.page-about .about-stat__label {
  font-size: var(--hf-fs-index-lg);
  letter-spacing: .06em;
  color: rgba(243, 237, 227, .62);
}

.page-about .about-hero__figure {
  margin: 0;
  border-radius: var(--hf-r-lg);
  overflow: hidden;
  box-shadow: 0 24px 60px rgba(5, 12, 20, .45);
}

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

/* ---------- 通用区块 ---------- */
.page-about .about-section {
  padding: clamp(64px, 10vh, 112px) 0;
}

.page-about .about-section--alt {
  background: var(--hf-bg-alt);
}

.page-about .about-section--rock {
  background: linear-gradient(180deg, var(--hf-rock) 0%, var(--hf-rock-deep) 100%);
  color: var(--hf-sand);
}

.page-about .about-section__head {
  max-width: 44rem;
  margin-bottom: clamp(32px, 5vh, 56px);
}

.page-about .about-section__eyebrow {
  margin: 0 0 var(--hf-space-2);
  color: var(--hf-copper);
}

.page-about .about-section__title {
  margin: 0 0 var(--hf-space-3);
  color: var(--hf-fg-strong);
  font-weight: 700;
}

.page-about .about-section__lead {
  margin: 0;
  font-size: var(--hf-fs-body);
  line-height: 1.85;
  color: var(--hf-ink);
}

.page-about .about-section__head--rock .about-section__eyebrow {
  color: var(--hf-copper-mist);
}

.page-about .about-section__head--rock .about-section__title {
  color: var(--hf-sand);
}

.page-about .about-section__head--rock .about-section__lead {
  color: rgba(243, 237, 227, .72);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  display: grid;
  gap: var(--hf-space-3);
}

.page-about .about-timeline__rail {
  display: flex;
  gap: var(--hf-space-2);
  overflow-x: auto;
  padding-bottom: var(--hf-space-2);
  scrollbar-width: none;
}

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

.page-about .about-timeline__tick {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  flex: 0 0 auto;
  padding: 4px 4px 6px;
  border-bottom: 2px solid transparent;
  font-size: var(--hf-fs-index);
  letter-spacing: .06em;
  color: var(--hf-rock-soft);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--hf-dur) var(--hf-ease), border-color var(--hf-dur) var(--hf-ease);
}

.page-about .about-timeline__tick:hover,
.page-about .about-timeline__tick[aria-current="true"] {
  color: var(--hf-copper);
  border-bottom-color: var(--hf-copper);
}

.page-about .about-timeline__event {
  position: relative;
  padding: 0 0 var(--hf-space-5) var(--hf-space-4);
  border-left: 1px solid var(--hf-line);
}

.page-about .about-timeline__event:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-timeline__event::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 8px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--hf-line);
  transition: background var(--hf-dur) var(--hf-ease), transform var(--hf-dur) var(--hf-ease);
}

.page-about .about-timeline__event[data-shown="true"]::before {
  background: var(--hf-copper);
  transform: scale(1.4);
}

.page-about .about-timeline__stage {
  margin: 0 0 var(--hf-space-1);
  font-size: var(--hf-fs-index);
  letter-spacing: .12em;
  color: var(--hf-rock-soft);
}

.page-about .about-timeline__event .hf-h3 {
  margin: 0 0 var(--hf-space-2);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--hf-fg-strong);
}

.page-about .about-timeline__event > p {
  margin: 0 0 var(--hf-space-3);
  font-size: var(--hf-fs-body-sm);
  line-height: 1.85;
  color: var(--hf-ink);
  max-width: 34em;
}

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

.page-about .about-timeline__points li {
  position: relative;
  padding-left: 18px;
  font-size: var(--hf-fs-body-sm);
  line-height: 1.75;
  color: var(--hf-ink);
  max-width: 34em;
}

.page-about .about-timeline__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 8px;
  height: 1px;
  background: var(--hf-copper);
}

/* ---------- 四步流程 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--hf-space-3);
  counter-reset: none;
}

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

.page-about .about-step details {
  height: 100%;
  background: var(--about-paper);
  border: 1px solid var(--about-hair);
  border-radius: 4px 22px 22px 22px;
  padding: var(--hf-space-3) var(--hf-space-3) var(--hf-space-2);
  transition: border-color var(--hf-dur) var(--hf-ease), box-shadow var(--hf-dur) var(--hf-ease);
}

.page-about .about-step:nth-child(2) details { border-radius: 22px 4px 22px 22px; }
.page-about .about-step:nth-child(3) details { border-radius: 22px 22px 4px 22px; }
.page-about .about-step:nth-child(4) details { border-radius: 22px 22px 22px 4px; }

.page-about .about-step details[open] {
  border-color: rgba(180, 118, 47, .48);
  box-shadow: 0 12px 30px rgba(14, 27, 42, .07);
}

.page-about .about-step__summary {
  display: grid;
  gap: 4px;
  cursor: pointer;
  list-style: none;
  outline-offset: 4px;
}

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

.page-about .about-step__num {
  font-size: var(--hf-fs-index);
  letter-spacing: .14em;
  color: var(--hf-copper);
}

.page-about .about-step__name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--hf-fg-strong);
  letter-spacing: .02em;
}

.page-about .about-step__meta {
  font-size: var(--hf-fs-index);
  letter-spacing: .08em;
  color: var(--hf-rock-soft);
}

.page-about .about-step__body {
  padding-top: var(--hf-space-2);
  margin-top: var(--hf-space-2);
  border-top: 1px dashed var(--about-dash);
}

.page-about .about-step__body p {
  margin: 0;
  font-size: var(--hf-fs-body-sm);
  line-height: 1.8;
  color: var(--hf-ink);
}

/* ---------- 编号说明 ---------- */
.page-about .about-numbering {
  display: grid;
  gap: var(--hf-space-4);
  margin-top: clamp(40px, 6vh, 64px);
  padding-top: clamp(32px, 5vh, 48px);
  border-top: 1px solid var(--about-hair);
}

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

.page-about .about-numbering__text .hf-h3 {
  margin: 0 0 var(--hf-space-3);
  color: var(--hf-fg-strong);
}

.page-about .about-numbering__text p {
  margin: 0 0 var(--hf-space-3);
  font-size: var(--hf-fs-body-sm);
  line-height: 1.85;
  color: var(--hf-ink);
  max-width: 34em;
}

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

/* ---------- 团队条块 ---------- */
.page-about .about-teams {
  display: grid;
  gap: var(--hf-space-3);
}

.page-about .about-team {
  padding: var(--hf-space-3) var(--hf-space-4);
  border-left: 3px solid var(--hf-copper);
  background: var(--about-paper);
  border-radius: 0 var(--hf-r-lg) var(--hf-r-lg) 0;
  transition: transform var(--hf-dur) var(--hf-ease), box-shadow var(--hf-dur) var(--hf-ease);
}

.page-about .about-team:hover {
  transform: translateX(4px);
  box-shadow: 0 14px 34px rgba(14, 27, 42, .08);
}

.page-about .about-team__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--hf-space-2);
}

.page-about .about-team__name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--hf-fg-strong);
}

.page-about .about-team__count {
  font-size: var(--hf-fs-body-sm);
  color: var(--hf-copper);
  letter-spacing: .06em;
}

.page-about .about-team__bar {
  position: relative;
  height: 6px;
  margin: var(--hf-space-2) 0 var(--hf-space-2);
  background: rgba(126, 147, 168, .22);
  border-radius: 99px;
  overflow: hidden;
}

.page-about .about-team__fill {
  display: block;
  height: 100%;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--hf-rock-mid), var(--hf-copper));
  transition: opacity var(--hf-dur) var(--hf-ease);
}

.page-about .about-team__fill--full { width: 100%; }
.page-about .about-team__fill--third { width: 33.33%; }
.page-about .about-team__fill--twothird { width: 66.67%; }

.page-about .about-team:hover .about-team__fill {
  opacity: .82;
}

.page-about .about-team__desc {
  margin: 0 0 var(--hf-space-2);
  font-size: var(--hf-fs-body-sm);
  line-height: 1.85;
  color: var(--hf-ink);
  max-width: 40em;
}

.page-about .about-team__tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-team__tags li {
  font-size: var(--hf-fs-index);
  letter-spacing: .06em;
  color: var(--hf-rock);
  background: var(--hf-copper-mist);
  border-radius: 99px;
  padding: 4px 12px;
  opacity: .78;
  transition: opacity var(--hf-dur) var(--hf-ease);
}

.page-about .about-team:hover .about-team__tags li {
  opacity: 1;
}

.page-about .about-teams__figure {
  margin: var(--hf-space-5) 0 0;
}

/* ---------- 覆盖与行业 ---------- */
.page-about .about-reach {
  display: grid;
  gap: var(--hf-space-5);
}

.page-about .about-reach__panel {
  background: var(--about-paper);
  border: 1px solid var(--about-hair);
  border-radius: var(--hf-r-lg);
  padding: var(--hf-space-4);
}

.page-about .about-reach__label {
  margin: 0 0 var(--hf-space-3);
  color: var(--hf-rock-soft);
}

.page-about .about-dots {
  display: grid;
  grid-template-columns: repeat(auto-fill, 18px);
  gap: 8px;
}

.page-about .about-dot {
  width: 18px;
  height: 18px;
  border-radius: 4px;
  background: rgba(47, 74, 102, .22);
}

.page-about .about-dot--origin {
  background: var(--hf-copper);
}

.page-about .about-reach__note {
  margin: var(--hf-space-4) 0 0;
  font-size: var(--hf-fs-index-lg);
  line-height: 1.7;
  color: var(--hf-ink);
  max-width: 28em;
}

.page-about .about-industries {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-hair);
  border-radius: var(--hf-r-lg);
  overflow: hidden;
}

.page-about .about-industry {
  display: grid;
  gap: 4px;
  padding: var(--hf-space-2) var(--hf-space-3);
  background: var(--hf-sand);
  transition: background var(--hf-dur) var(--hf-ease);
}

.page-about .about-industry:hover {
  background: var(--about-paper);
}

.page-about .about-industry__name {
  font-size: var(--hf-fs-body-sm);
  font-weight: 700;
  color: var(--hf-fg-strong);
}

.page-about .about-industry__use {
  font-size: var(--hf-fs-index-lg);
  line-height: 1.7;
  color: var(--hf-ink);
}

/* ---------- 名录与合作 ---------- */
.page-about .about-credentials {
  display: grid;
  gap: var(--hf-space-3);
}

.page-about .about-cred {
  border-top: 3px solid var(--hf-copper);
}

.page-about .about-cred .hf-card__index {
  color: var(--hf-rock-soft);
}

.page-about .about-cred .hf-card__title {
  color: var(--hf-fg-strong);
}

/* ---------- 承诺 ---------- */
.page-about .about-commit {
  display: grid;
  gap: var(--hf-space-3);
}

.page-about .about-commit__item {
  display: grid;
  grid-template-columns: 2.25rem minmax(0, 1fr);
  gap: var(--hf-space-3);
  padding: var(--hf-space-4);
  border: 1px solid var(--about-rock-hair);
  border-radius: var(--hf-r-lg);
  background: rgba(47, 74, 102, .26);
  transition: border-color var(--hf-dur) var(--hf-ease), background var(--hf-dur) var(--hf-ease);
}

.page-about .about-commit__item:hover {
  border-color: rgba(232, 201, 160, .58);
  background: rgba(47, 74, 102, .4);
}

.page-about .about-commit__num {
  font-size: var(--hf-fs-index);
  letter-spacing: .12em;
  color: var(--hf-copper-mist);
  padding-top: 4px;
}

.page-about .about-commit__title {
  margin: 0 0 var(--hf-space-2);
  font-size: var(--hf-fs-h3);
  font-weight: 700;
  color: var(--hf-sand);
}

.page-about .about-commit__item p {
  margin: 0 0 var(--hf-space-2);
  font-size: var(--hf-fs-body-sm);
  line-height: 1.85;
  color: rgba(243, 237, 227, .76);
  max-width: 34em;
}

.page-about .about-commit__link {
  display: inline-block;
  font-size: var(--hf-fs-index-lg);
  letter-spacing: .04em;
  color: var(--hf-copper-mist);
  text-decoration: none;
  border-bottom: 1px solid rgba(232, 201, 160, .42);
  padding-bottom: 2px;
  transition: color var(--hf-dur) var(--hf-ease), border-color var(--hf-dur) var(--hf-ease);
}

.page-about .about-commit__link:hover {
  color: var(--hf-sand);
  border-bottom-color: var(--hf-sand);
}

.page-about .about-cta {
  margin-top: clamp(40px, 6vh, 64px);
  padding-top: var(--hf-space-5);
  border-top: 1px solid var(--about-rock-hair);
  display: grid;
  gap: var(--hf-space-4);
}

.page-about .about-cta__text {
  margin: 0;
  font-size: var(--hf-fs-lead);
  line-height: 1.75;
  color: rgba(243, 237, 227, .82);
  max-width: 30em;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--hf-space-2);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-reach {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
    align-items: start;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    gap: var(--hf-space-6);
    align-items: end;
  }

  .page-about .about-hero__figure {
    align-self: end;
  }

  .page-about .about-timeline {
    grid-template-columns: 156px minmax(0, 1fr);
    gap: var(--hf-space-6);
  }

  .page-about .about-timeline__rail {
    position: sticky;
    top: 120px;
    align-self: start;
    flex-direction: column;
    gap: var(--hf-space-3);
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-timeline__tick {
    padding: 6px 0 6px 12px;
    border-bottom: 0;
    border-left: 2px solid transparent;
  }

  .page-about .about-timeline__tick:hover,
  .page-about .about-timeline__tick[aria-current="true"] {
    border-bottom-color: transparent;
    border-left-color: var(--hf-copper);
  }

  .page-about .about-timeline__event {
    padding-left: var(--hf-space-5);
    padding-bottom: var(--hf-space-6);
  }

  .page-about .about-timeline__event::before {
    left: -4.5px;
    width: 8px;
    height: 8px;
  }

  .page-about .about-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--hf-space-4);
  }

  .page-about .about-step:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 40px;
    left: 100%;
    width: var(--hf-space-4);
    border-top: 1px dashed var(--about-dash);
    pointer-events: none;
  }

  .page-about .about-numbering {
    grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
    gap: var(--hf-space-6);
    align-items: center;
  }

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

  .page-about .about-reach {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
    gap: var(--hf-space-6);
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero {
    padding-top: clamp(120px, 16vh, 176px);
  }

  .page-about .about-team {
    padding: var(--hf-space-4) var(--hf-space-5);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }
}