.page-about {
  --ab-gutter: clamp(1rem, 4vw, 3rem);
  background-color: var(--bt-paper);
  color: var(--bt-black);
  font-family: var(--bt-sans);
  line-height: 1.75;
  overflow-x: hidden;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--bt-serif);
  font-weight: 700;
  color: var(--bt-ink);
  margin: 0;
}

.page-about a {
  color: var(--bt-gold-deep);
}

/* ---------- 面包屑 ---------- */
.page-about .bt-crumbs {
  padding-top: clamp(1rem, 3vw, 1.6rem);
  font-size: .84rem;
}
.page-about .bt-crumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .bt-crumbs__item {
  display: flex;
  align-items: center;
  gap: .45rem;
  color: #5a6b78;
}
.page-about .bt-crumbs__item a {
  color: var(--bt-gold-deep);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--bt-dur) var(--bt-ease);
}
.page-about .bt-crumbs__item a:hover,
.page-about .bt-crumbs__item a:focus-visible {
  border-bottom-color: var(--bt-gold);
}
.page-about .bt-crumbs__sep {
  color: var(--bt-silver);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding-bottom: clamp(2rem, 5vw, 3.5rem);
  border-bottom: 1px solid var(--bt-silver);
  background-image: repeating-linear-gradient(135deg, rgba(11, 31, 51, .035) 0 2px, transparent 2px 18px);
}
.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
  padding-top: clamp(1.25rem, 3vw, 2.25rem);
  padding-bottom: clamp(1.5rem, 4vw, 2.75rem);
}
.page-about .ab-hero__aside {
  display: flex;
  align-items: center;
  gap: .85rem;
}
.page-about .ab-hero__since {
  font-family: var(--bt-mono);
  font-size: .75rem;
  letter-spacing: .12em;
  color: var(--bt-mist);
}
.page-about .ab-hero__mark {
  width: 12px;
  height: 12px;
  flex: none;
  background-color: var(--bt-gold);
  transform: rotate(45deg);
}
.page-about .ab-hero__vlabel {
  font-family: var(--bt-mono);
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--bt-gold-deep);
  border: 1px solid var(--bt-gold-soft);
  padding: .12rem .5rem;
}
.page-about .ab-hero__title {
  font-size: clamp(1.9rem, 6.2vw, 3.5rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  max-width: 20ch;
}
.page-about .ab-hero__lead {
  max-width: 62ch;
  margin: 1.1rem 0 0;
  font-size: clamp(1rem, 1.6vw, 1.075rem);
  color: #33475b;
}
.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.6rem;
}
.page-about .ab-hero__actions .bt-btn {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
}
.page-about .ab-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background-color: var(--bt-silver);
  border: 1px solid var(--bt-silver);
}
.page-about .ab-stat {
  background-color: var(--bt-paper);
  padding: clamp(.85rem, 2vw, 1.15rem) clamp(.9rem, 2vw, 1.25rem);
  display: flex;
  flex-direction: column;
  gap: .2rem;
}
.page-about .ab-stat__num {
  font-family: var(--bt-mono);
  font-size: clamp(1.15rem, 3.2vw, 1.6rem);
  font-weight: 600;
  color: var(--bt-ink);
  letter-spacing: .01em;
  line-height: 1.2;
}
.page-about .ab-stat__label {
  font-size: .82rem;
  color: #5a6b78;
  letter-spacing: .02em;
}

/* ---------- 铜金色带 ---------- */
.page-about .ab-band {
  height: 8px;
  background-color: var(--bt-gold);
  background-image: repeating-linear-gradient(135deg, rgba(245, 242, 234, .35) 0 3px, transparent 3px 11px);
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-section {
  padding: clamp(2.5rem, 7vw, 5rem) 0;
}
.page-about .ab-head {
  max-width: 62ch;
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
}
.page-about .ab-head__index {
  display: inline-block;
  font-family: var(--bt-mono);
  font-size: .75rem;
  letter-spacing: .14em;
  color: var(--bt-gold-deep);
  border-bottom: 2px solid var(--bt-gold-soft);
  padding-bottom: .2rem;
  margin-bottom: .9rem;
}
.page-about .ab-head__title {
  font-size: clamp(1.55rem, 4.4vw, 2.6rem);
  line-height: 1.2;
  letter-spacing: -0.015em;
}
.page-about .ab-head__lead {
  margin: .9rem 0 0;
  color: #3d4d5c;
}

/* ---------- 图片框 ---------- */
.page-about .ab-fig {
  margin: 0;
}
.page-about .ab-fig__frame {
  position: relative;
  background-color: var(--bt-mist-soft);
  background-image: repeating-linear-gradient(45deg, rgba(111, 143, 138, .22) 0 2px, transparent 2px 14px);
  overflow: hidden;
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
}
.page-about .ab-fig__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}
.page-about .ab-fig__caption {
  margin-top: .6rem;
  font-family: var(--bt-mono);
  font-size: .76rem;
  letter-spacing: .03em;
  color: #5a6b78;
}

/* ---------- 起点章节 ---------- */
.page-about .ab-origin__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.75rem;
}
.page-about .ab-origin__body p {
  margin: 0 0 1rem;
  max-width: 62ch;
}
.page-about .ab-origin__list {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  border-top: 1px solid var(--bt-silver);
}
.page-about .ab-origin__list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .15rem;
  padding: .8rem 0;
  border-bottom: 1px solid var(--bt-silver);
}
.page-about .ab-origin__k {
  font-family: var(--bt-mono);
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--bt-mist);
}
.page-about .ab-origin__v {
  color: var(--bt-black);
}

/* ---------- 时间线 ---------- */
.page-about .ab-jump {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 1.75rem;
}
.page-about .ab-jump__item {
  font-family: var(--bt-mono);
  font-size: .76rem;
  letter-spacing: .06em;
  text-decoration: none;
  color: var(--bt-ink);
  border: 1px solid var(--bt-silver);
  padding: .28rem .7rem;
  transition: border-color var(--bt-dur) var(--bt-ease), color var(--bt-dur) var(--bt-ease), background-color var(--bt-dur) var(--bt-ease);
}
.page-about .ab-jump__item:hover,
.page-about .ab-jump__item:focus-visible {
  border-color: var(--bt-gold);
  background-color: var(--bt-gold-soft);
  color: var(--bt-ink);
}

.page-about .ab-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.85rem;
}
.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: .5rem;
  bottom: .5rem;
  width: 1px;
  background: linear-gradient(180deg, var(--bt-gold) 0%, var(--bt-mist) 55%, var(--bt-silver) 100%);
}
.page-about .ab-timeline__item {
  position: relative;
  padding-left: 2rem;
  scroll-margin-top: 6rem;
  outline-offset: 8px;
}
.page-about .ab-timeline__node {
  display: flex;
  align-items: center;
  gap: .5rem;
  margin-bottom: .55rem;
}
.page-about .ab-timeline__dot {
  position: absolute;
  left: 3px;
  top: .5rem;
  width: 9px;
  height: 9px;
  background-color: var(--bt-gold);
  transform: rotate(45deg);
  box-shadow: 0 0 0 3px var(--bt-paper);
  transition: transform var(--bt-dur) var(--bt-ease), background-color var(--bt-dur) var(--bt-ease);
}
.page-about .ab-timeline__item:hover .ab-timeline__dot,
.page-about .ab-timeline__item:focus .ab-timeline__dot {
  transform: rotate(45deg) scale(1.3);
  background-color: var(--bt-gold-deep);
}
.page-about .ab-timeline__year {
  font-family: var(--bt-mono);
  font-size: .78rem;
  letter-spacing: .1em;
  color: var(--bt-gold-deep);
}
.page-about .ab-timeline__card {
  background-color: #FFFFFF;
  border: 1px solid var(--bt-silver);
  border-left: 3px solid var(--bt-mist);
  padding: 1.05rem 1.15rem 1.15rem;
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
  transition: border-left-color var(--bt-dur) var(--bt-ease), box-shadow var(--bt-dur) var(--bt-ease);
}
.page-about .ab-timeline__item:hover .ab-timeline__card,
.page-about .ab-timeline__item:focus .ab-timeline__card {
  border-left-color: var(--bt-gold);
  box-shadow: var(--bt-shadow);
}
.page-about .ab-timeline__title {
  font-size: clamp(1.05rem, 2.4vw, 1.3rem);
  line-height: 1.3;
  margin-bottom: .45rem;
}
.page-about .ab-timeline__text {
  margin: 0;
  font-size: .95rem;
  color: #33475b;
  max-width: 62ch;
}
.page-about .ab-timeline__more {
  margin: .6rem 0 0;
  font-size: .88rem;
  color: #5a6b78;
  max-width: 62ch;
}
.page-about .ab-timeline__tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  margin: .9rem 0 0;
  padding: 0;
}
.page-about .ab-tag {
  font-family: var(--bt-mono);
  font-size: .7rem;
  letter-spacing: .06em;
  color: var(--bt-ink);
  background-color: var(--bt-mist-soft);
  padding: .16rem .5rem;
}

/* ---------- 团队章节（深色区） ---------- */
.page-about .ab-team {
  background-color: var(--bt-ink);
  color: var(--bt-paper);
  padding: clamp(2.5rem, 7vw, 5rem) 0;
}
.page-about .ab-head--dark .ab-head__index {
  color: var(--bt-gold-soft);
  border-bottom-color: rgba(225, 199, 163, .45);
}
.page-about .ab-head--dark .ab-head__title {
  color: var(--bt-paper);
}
.page-about .ab-head--dark .ab-head__lead {
  color: rgba(245, 242, 234, .78);
}
.page-about .ab-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.75rem;
}
.page-about .ab-team .ab-fig__frame {
  background-color: var(--bt-night);
}
.page-about .ab-team .ab-fig__caption {
  color: rgba(245, 242, 234, .62);
}
.page-about .ab-team__roles {
  list-style: none;
  margin: 0 0 1.75rem;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background-color: rgba(200, 205, 210, .22);
  border: 1px solid rgba(200, 205, 210, .22);
}
.page-about .ab-role {
  background-color: var(--bt-ink);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: .15rem .8rem;
  padding: .85rem 1rem;
}
.page-about .ab-role__num {
  grid-row: span 2;
  font-family: var(--bt-mono);
  font-size: 1.5rem;
  line-height: 1;
  color: var(--bt-gold-soft);
}
.page-about .ab-role__name {
  font-size: .98rem;
  color: var(--bt-paper);
}
.page-about .ab-role__desc {
  font-size: .82rem;
  color: rgba(245, 242, 234, .66);
}
.page-about .ab-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.15rem;
}
.page-about .ab-flow__step {
  border-top: 2px solid var(--bt-gold);
  padding-top: .75rem;
}
.page-about .ab-flow__idx {
  font-family: var(--bt-mono);
  font-size: .72rem;
  letter-spacing: .12em;
  color: var(--bt-gold-soft);
}
.page-about .ab-flow__title {
  font-size: 1.05rem;
  color: var(--bt-paper);
  margin: .35rem 0 .35rem;
}
.page-about .ab-flow__text {
  margin: 0;
  font-size: .9rem;
  color: rgba(245, 242, 234, .78);
}

/* ---------- 合作生态 ---------- */
.page-about .ab-eco__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.75rem;
  align-items: start;
}
.page-about .ab-eco__nodes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .75rem;
}
.page-about .ab-eco__node {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .15rem;
  background-color: #FFFFFF;
  border: 1px solid var(--bt-silver);
  border-left: 3px solid var(--bt-mist);
  padding: .95rem 1.1rem;
  transition: border-left-color var(--bt-dur) var(--bt-ease), background-color var(--bt-dur) var(--bt-ease), transform var(--bt-dur) var(--bt-ease);
}
.page-about .ab-eco__node:hover,
.page-about .ab-eco__node:focus {
  border-left-color: var(--bt-gold);
  background-color: var(--bt-mist-soft);
  transform: translateX(3px);
}
.page-about .ab-eco__count {
  font-family: var(--bt-mono);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--bt-ink);
  letter-spacing: .02em;
}
.page-about .ab-eco__name {
  font-family: var(--bt-serif);
  font-weight: 700;
  font-size: 1rem;
  color: var(--bt-ink);
}
.page-about .ab-eco__detail {
  font-size: .87rem;
  color: #4a5a68;
  line-height: 1.65;
}
.page-about .ab-honor {
  list-style: none;
  margin: 2rem 0 0;
  padding: 1.1rem 1.2rem;
  background-color: var(--bt-mist-soft);
  border-left: 3px solid var(--bt-gold);
  display: grid;
  gap: .35rem;
}
.page-about .ab-honor__item {
  font-size: .92rem;
  color: var(--bt-ink);
}

/* ---------- 贵州本地服务 ---------- */
.page-about .ab-local {
  padding: clamp(2.5rem, 7vw, 5rem) 0;
  background-image: linear-gradient(180deg, var(--bt-paper) 0%, #EFE9DC 100%);
}
.page-about .ab-local__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.5rem;
  align-items: start;
}
.page-about .ab-local__panel {
  background-color: #FFFFFF;
  border: 1px solid var(--bt-silver);
  border-top: 3px solid var(--bt-gold);
  padding: 1.25rem 1.3rem;
}
.page-about .ab-local__panelTitle {
  font-size: 1.15rem;
  margin: 0 0 .7rem;
}
.page-about .ab-local__panel p {
  margin: 0 0 .85rem;
  font-size: .93rem;
  color: #33475b;
  max-width: 62ch;
}
.page-about .ab-local__panel p:last-child {
  margin-bottom: 0;
}
.page-about .ab-local__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  background-color: var(--bt-silver);
  border: 1px solid var(--bt-silver);
}
.page-about .ab-fact {
  background-color: var(--bt-paper);
  padding: .85rem .95rem;
}
.page-about .ab-fact dt {
  font-size: .78rem;
  letter-spacing: .04em;
  color: #5a6b78;
}
.page-about .ab-fact dd {
  margin: .25rem 0 0;
  font-family: var(--bt-mono);
  font-size: 1rem;
  color: var(--bt-ink);
}
.page-about .ab-cinfo {
  margin-top: 1.5rem;
  border-top: 1px solid var(--bt-silver);
}
.page-about .ab-cinfo__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .15rem;
  padding: .8rem 0;
  border-bottom: 1px solid var(--bt-silver);
}
.page-about .ab-cinfo__key {
  font-family: var(--bt-mono);
  font-size: .76rem;
  letter-spacing: .08em;
  color: var(--bt-mist);
}
.page-about .ab-cinfo__val {
  font-size: .95rem;
  color: var(--bt-ink);
  word-break: break-word;
}

/* ---------- 底部行动区 ---------- */
.page-about .ab-cta {
  background-color: var(--bt-night);
  background-image: repeating-linear-gradient(135deg, rgba(184, 115, 51, .16) 0 3px, transparent 3px 15px);
  color: var(--bt-paper);
  padding: clamp(2.25rem, 6vw, 3.5rem) 0;
}
.page-about .ab-cta__inner {
  max-width: 720px;
}
.page-about .ab-cta__title {
  color: var(--bt-paper);
  font-size: clamp(1.4rem, 3.8vw, 2.1rem);
  line-height: 1.24;
}
.page-about .ab-cta__text {
  margin: .85rem 0 1.5rem;
  color: rgba(245, 242, 234, .82);
  max-width: 62ch;
}
.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}
.page-about .ab-cta__actions .bt-btn {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
}
.page-about .ab-cta .bt-btn--ghost {
  color: var(--bt-paper);
  border-color: rgba(245, 242, 234, .5);
}
.page-about .ab-cta .bt-btn--ghost:hover,
.page-about .ab-cta .bt-btn--ghost:focus-visible {
  border-color: var(--bt-gold-soft);
  color: var(--bt-gold-soft);
}

.page-about :focus-visible {
  outline: 2px solid var(--bt-gold);
  outline-offset: 3px;
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .ab-origin__list li {
    grid-template-columns: 12rem minmax(0, 1fr);
    gap: 1rem;
    align-items: baseline;
  }
  .page-about .ab-timeline__more {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
    overflow: hidden;
    transition: max-height var(--bt-dur) var(--bt-ease), opacity var(--bt-dur) var(--bt-ease), margin-top var(--bt-dur) var(--bt-ease);
  }
  .page-about .ab-timeline__item:hover .ab-timeline__more,
  .page-about .ab-timeline__item:focus .ab-timeline__more {
    max-height: 14rem;
    opacity: 1;
    margin-top: .6rem;
  }
  .page-about .ab-team__roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .ab-role {
    grid-template-columns: minmax(0, 1fr);
    gap: .3rem;
  }
  .page-about .ab-role__num {
    grid-row: auto;
    font-size: 1.7rem;
  }
  .page-about .ab-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.5rem;
  }
  .page-about .ab-cinfo__row {
    grid-template-columns: 8rem minmax(0, 1fr);
    gap: 1rem;
    align-items: baseline;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .ab-hero__grid {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 2.5rem;
    padding-top: 2.75rem;
  }
  .page-about .ab-hero__aside {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.1rem;
    padding-top: .6rem;
  }
  .page-about .ab-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .ab-origin__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 1fr);
    gap: 3rem;
  }
  .page-about .ab-origin__list li {
    grid-template-columns: 10rem minmax(0, 1fr);
  }

  .page-about .ab-timeline {
    gap: 2.25rem;
  }
  .page-about .ab-timeline::before {
    left: 131px;
  }
  .page-about .ab-timeline__item {
    display: grid;
    grid-template-columns: 110px minmax(0, 1fr);
    gap: 0 3.25rem;
    padding-left: 0;
  }
  .page-about .ab-timeline__node {
    align-items: flex-start;
    justify-content: flex-end;
    text-align: right;
    margin-bottom: 0;
    padding-top: .2rem;
  }
  .page-about .ab-timeline__dot {
    left: 126px;
    top: .55rem;
  }
  .page-about .ab-timeline__year {
    line-height: 1.5;
  }
  .page-about .ab-timeline__item:nth-child(even) .ab-timeline__card {
    margin-left: 2.5rem;
  }

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    gap: 3rem;
    align-items: start;
  }
  .page-about .ab-eco__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 3rem;
  }
  .page-about .ab-local__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: 2.5rem;
  }
}

@media (min-width: 1180px) {
  .page-about .ab-hero__title {
    max-width: 24ch;
  }
}