.page-about {
  --about-rail-w: 196px;
  --about-gap: 52px;
  --about-rule: rgba(185, 138, 62, 0.34);
  --about-rule-soft: rgba(185, 138, 62, 0.18);
  background: var(--paper-100);
  color: var(--ink-900);
  font-family: var(--font-body);
  padding-bottom: 96px;
}

.page-about .breadcrumb {
  padding-top: 22px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 18px 0 54px;
  border-bottom: 1px solid var(--hairline-ink);
}

.page-about .about-hero__inner {
  display: grid;
  gap: 22px;
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(32px, 6.6vw, 72px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  max-width: 20ch;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 62ch;
  font-size: var(--fs-18);
  line-height: 1.85;
  color: var(--ink-700);
}

.page-about .about-hero__meta {
  list-style: none;
  margin: 10px 0 0;
  padding: 26px 0 0;
  display: grid;
  gap: 22px;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-hero__meta li {
  display: grid;
  gap: 4px;
}

.page-about .about-hero__meta em {
  font-style: normal;
  font-size: var(--fs-14);
  color: var(--mineral-500);
  line-height: 1.6;
}

.page-about .about-unit {
  font-family: var(--font-body);
  font-size: var(--fs-16);
  color: var(--ink-700);
  margin-left: 0.12em;
}

.page-about .about-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  color: var(--bronze-700);
  letter-spacing: 0.01em;
}

.page-about .about-hero__meta .about-num {
  font-size: clamp(30px, 5vw, 46px);
  line-height: 1;
}

/* ---------- 主体骨架：编号 rail + 长文 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  padding-top: 44px;
}

.page-about .about-rail__title {
  margin: 0 0 10px;
  font-size: var(--fs-12);
  letter-spacing: 0.22em;
  color: var(--mineral-500);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-rail__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  white-space: nowrap;
  padding: 7px 12px;
  font-size: var(--fs-14);
  color: var(--ink-700);
  text-decoration: none;
  border: 1px solid var(--hairline-ink);
  border-radius: 2px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-rail__list a .about-num {
  font-size: var(--fs-12);
  color: var(--bronze-500);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--cinnabar-600);
  border-color: var(--about-rule);
}

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

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  scroll-margin-top: 24px;
}

.page-about .about-sec + .about-sec {
  margin-top: 58px;
}

.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 13px;
  margin-bottom: 22px;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-sec__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-22);
  font-weight: 700;
  color: var(--bronze-500);
  line-height: 1;
}

.page-about .about-sec__head h2 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(23px, 3.4vw, 38px);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-about .about-sec__lead {
  margin: 0 0 22px;
  max-width: 66ch;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--ink-700);
}

/* ---------- 深色章节 ---------- */
.page-about .about-sec--dark {
  background-color: var(--ink-900);
  background-image:
    radial-gradient(circle at 88% 10%, rgba(185, 138, 62, 0.16), transparent 55%),
    linear-gradient(180deg, var(--ink-900), var(--ink-700));
  color: var(--paper-100);
  padding: clamp(26px, 4.6vw, 54px);
  border-radius: 3px;
}

.page-about .about-sec--dark .about-sec__head {
  border-bottom-color: rgba(185, 138, 62, 0.44);
}

.page-about .about-sec--dark .about-sec__num {
  color: var(--bronze-500);
}

.page-about .about-sec--dark .about-sec__lead {
  color: var(--on-dark);
}

.page-about .about-sec--dark a {
  color: var(--bronze-200);
  text-decoration: none;
  border-bottom: 1px solid rgba(228, 205, 158, 0.42);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-sec--dark a:hover,
.page-about .about-sec--dark a:focus-visible {
  color: #fff;
  border-bottom-color: #fff;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 26px;
}

.page-about .about-figure--side,
.page-about .about-figure--inline {
  margin: 26px 0 0;
}

.page-about .about-media {
  position: relative;
  overflow: hidden;
  background: var(--slate-100);
  border: 1px solid var(--hairline-ink);
}

.page-about .about-media img {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.88) contrast(1.02);
}

.page-about .about-media--wide {
  aspect-ratio: 16 / 9;
}

.page-about .about-media--4x3 {
  aspect-ratio: 4 / 3;
}

.page-about .about-media--3x2 {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--mineral-500);
}

.page-about .about-sec--dark .about-figure figcaption {
  color: var(--on-dark-dim);
}

/* ---------- 01 时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 4px 0 0 24px;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 22px;
  width: 1px;
  background: linear-gradient(180deg, var(--bronze-500) 0%, rgba(185, 138, 62, 0.12) 100%);
}

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

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--paper-100);
  border: 2px solid var(--bronze-500);
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .timeline__item--account::before {
  border-color: var(--cinnabar-600);
}

.page-about .timeline__item--param::before {
  border-color: var(--slate-600);
}

.page-about .timeline__item--partner::before {
  border-color: var(--clay-500);
}

.page-about .timeline__item:hover::before {
  transform: scale(1.35);
  background: var(--bronze-200);
}

.page-about .timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-22);
  font-weight: 700;
  color: var(--bronze-700);
  line-height: 1.2;
  transition: color var(--dur) var(--ease);
}

.page-about .timeline__item:hover .timeline__year {
  color: var(--cinnabar-600);
}

.page-about .timeline__body h3 {
  margin: 6px 0 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: var(--fs-18);
  line-height: 1.45;
}

.page-about .timeline__body p {
  margin: 0;
  max-width: 62ch;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--mineral-500);
  transition: color var(--dur) var(--ease);
}

.page-about .timeline__item:hover .timeline__body p {
  color: var(--ink-700);
}

/* ---------- 02 业务轨道 ---------- */
.page-about .line-track {
  display: grid;
  gap: 26px;
}

.page-about .line-track__item {
  padding-left: 20px;
  border-left: 1px solid rgba(185, 138, 62, 0.46);
}

.page-about .line-track__item h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: var(--fs-22);
  line-height: 1.35;
  color: var(--paper-100);
}

.page-about .line-track__item p {
  margin: 0 0 12px;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--on-dark);
}

.page-about .line-track__item a {
  display: inline-block;
  font-size: var(--fs-14);
}

/* ---------- 03 团队 ---------- */
.page-about .about-split {
  display: grid;
  gap: 24px;
}

.page-about .about-split__text .about-sec__lead {
  margin-bottom: 18px;
}

.page-about .team-list {
  margin: 0;
  border-top: 1px solid var(--hairline-ink);
}

.page-about .team-list > div {
  display: grid;
  gap: 5px;
  padding: 16px 0;
  border-bottom: 1px solid var(--hairline-ink);
}

.page-about .team-list dt {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: var(--fs-18);
  line-height: 1.4;
}

.page-about .team-list dd {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--mineral-500);
}

/* ---------- 04 台账 ---------- */
.page-about .about-ledger {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--hairline-ink);
}

.page-about .about-ledger li {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--hairline-ink);
}

.page-about .about-ledger__key {
  font-size: var(--fs-13, 13px);
  letter-spacing: 0.08em;
  color: var(--slate-600);
}

.page-about .about-ledger__val {
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--ink-700);
}

/* ---------- 05 合作生态 ---------- */
.page-about .about-partner-total {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px 16px;
  margin-bottom: 26px;
}

.page-about .about-num--xl {
  font-size: clamp(54px, 9.5vw, 100px);
  line-height: 0.95;
  color: var(--bronze-500);
}

.page-about .about-partner-total p {
  margin: 0;
  max-width: 30ch;
  font-size: var(--fs-16);
  line-height: 1.7;
  color: var(--on-dark);
}

.page-about .about-partner-split {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 14px;
  padding: 22px 0 26px;
  border-top: 1px solid rgba(185, 138, 62, 0.4);
  border-bottom: 1px solid rgba(185, 138, 62, 0.2);
  margin-bottom: 8px;
}

.page-about .about-partner-split > div {
  display: grid;
  gap: 4px;
}

.page-about .about-partner-split .about-num {
  font-size: clamp(26px, 4.2vw, 38px);
  line-height: 1;
  color: var(--paper-100);
}

.page-about .about-partner-split em {
  font-style: normal;
  font-size: var(--fs-14);
  color: var(--on-dark-dim);
}

.page-about .about-sec--dark .about-sec__lead {
  margin-top: 20px;
}

/* ---------- 准入阶段 ---------- */
.page-about .about-stages {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid rgba(185, 138, 62, 0.42);
}

.page-about .about-stages__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 5px 12px;
  padding: 16px 0;
  border-bottom: 1px solid var(--about-rule-soft);
}

.page-about .about-stages__idx {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-14);
  color: var(--bronze-500);
  line-height: 1.9;
}

.page-about .about-stages__item h3 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: var(--fs-18);
  line-height: 1.5;
  color: var(--paper-100);
}

.page-about .about-stages__item p {
  grid-column: 2;
  margin: 0;
  font-size: var(--fs-15, 15px);
  line-height: 1.8;
  color: var(--on-dark);
}

/* ---------- 06 服务节奏 ---------- */
.page-about .about-promise {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: grid;
  gap: 24px;
}

.page-about .about-promise > li {
  display: grid;
  gap: 8px;
  padding-top: 18px;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-promise .about-num {
  font-size: clamp(40px, 7.6vw, 64px);
  line-height: 1;
  color: var(--cinnabar-600);
}

.page-about .about-promise em {
  font-style: normal;
  font-size: var(--fs-16);
  line-height: 1.7;
  color: var(--ink-700);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 收束 ---------- */
.page-about .about-closing {
  margin-top: 72px;
  padding-top: 26px;
  border-top: 1px solid var(--bronze-500);
}

.page-about .about-closing p {
  margin: 0;
  max-width: 68ch;
  font-size: var(--fs-16);
  line-height: 1.9;
  color: var(--ink-700);
}

.page-about .about-closing a {
  color: var(--bronze-700);
  text-decoration: none;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-closing a:hover,
.page-about .about-closing a:focus-visible {
  color: var(--cinnabar-600);
  border-bottom-color: var(--cinnabar-600);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero__meta {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px;
  }

  .page-about .about-ledger li {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

@media (min-width: 860px) {
  .page-about .about-hero {
    padding-bottom: 68px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-figure--side {
    margin-top: 0;
  }

  .page-about .line-track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 32px;
  }

  .page-about .about-partner-split {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
  }

  .page-about .about-stages__item {
    grid-template-columns: 40px 196px minmax(0, 1fr);
    gap: 12px 20px;
    align-items: baseline;
  }

  .page-about .about-stages__item p {
    grid-column: 3;
  }

  .page-about .about-promise {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 44px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--about-gap);
    padding-top: 66px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 108px;
    align-self: start;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    border-left: 1px solid var(--hairline-ink);
  }

  .page-about .about-rail__list a {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    padding: 8px 10px 8px 14px;
  }

  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus-visible {
    border-left-color: var(--cinnabar-600);
  }

  .page-about .about-sec + .about-sec {
    margin-top: 86px;
  }
}

@media (min-width: 1240px) {
  .page-about .about-figure--inline {
    max-width: 78%;
  }

  .page-about .about-partner-total {
    align-items: flex-end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

  .page-about [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }
}

.page-about {
  --fs-13: 1rem;
  --fs-15: 1rem;
}