.page-about {
  --about-gap: clamp(18px, 4.5vw, 48px);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.85;
  overflow-x: clip;
}

.page-about .container {
  width: 100%;
  max-width: 1160px;
  margin-inline: auto;
  padding-inline: var(--about-gap);
}

/* ---------- 面包屑 ---------- */
.page-about .crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: .14em;
  color: rgba(245, 239, 227, .58);
  font-family: var(--font-mono);
}
.page-about .crumb a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid rgba(245, 239, 227, .28);
}
.page-about .crumb a:hover { color: var(--gold); border-bottom-color: var(--gold); }
.page-about .crumb__sep { color: var(--orange); }
.page-about .crumb__now { color: var(--paper); }

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  background: var(--ink);
  color: var(--paper);
  padding: clamp(22px, 4vw, 34px) 0 clamp(46px, 8vw, 88px);
  border-bottom: 1px solid rgba(245, 239, 227, .14);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(30px, 5vw, 52px);
  margin-top: clamp(28px, 6vw, 58px);
}

.page-about .about-hero h1.display {
  margin: .6rem 0 0;
  font-size: clamp(1.9rem, 5.2vw, 3.4rem);
  line-height: 1.07;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--paper);
  max-width: 20em;
}

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

.page-about .about-hero .lede {
  margin: 1.15rem 0 0;
  max-width: 36rem;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(245, 239, 227, .76);
}

.page-about .hero-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid rgba(245, 239, 227, .16);
  border-left: 1px solid rgba(245, 239, 227, .16);
}

.page-about .hero-fact {
  padding: 14px 14px 16px;
  border-right: 1px solid rgba(245, 239, 227, .16);
  border-bottom: 1px solid rgba(245, 239, 227, .16);
}

.page-about .hero-fact__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.4rem;
  line-height: 1.2;
  letter-spacing: .01em;
  color: var(--gold);
}

.page-about .hero-fact__label {
  display: block;
  margin-top: 5px;
  font-size: 11px;
  letter-spacing: .13em;
  color: rgba(245, 239, 227, .58);
}

/* ---------- 索引条 ---------- */
.page-about .index-bar {
  position: sticky;
  top: 0;
  z-index: 6;
  background: var(--paper-2);
  border-bottom: var(--bd);
}

.page-about .index-bar__inner {
  display: flex;
  align-items: center;
  gap: 2px;
  padding-block: 9px;
  overflow-x: auto;
  scrollbar-width: none;
}
.page-about .index-bar__inner::-webkit-scrollbar { display: none; }

.page-about .index-bar__label {
  flex: none;
  margin-right: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--index);
}

.page-about .index-bar__link {
  flex: none;
  padding: 5px 11px;
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--slate);
  text-decoration: none;
  border: 1px solid transparent;
  white-space: nowrap;
}
.page-about .index-bar__link:hover {
  color: var(--ink);
  border-color: var(--rule);
}
.page-about .index-bar__link[aria-current="true"] {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

/* ---------- 区块节奏 ---------- */
.page-about .section { padding: clamp(46px, 8vw, 92px) 0; }
.page-about .section--tight { padding-top: clamp(34px, 5vw, 56px); }

.page-about .section__head { margin-bottom: clamp(26px, 4vw, 46px); }
.page-about .section__head .eyebrow { color: var(--orange); }
.page-about .section__head .section__title {
  margin: .4rem 0 0;
  font-size: clamp(1.35rem, 3.2vw, 2rem);
  font-weight: 700;
  line-height: 1.32;
  letter-spacing: -0.01em;
  max-width: 26em;
}

.page-about .origin-aside,
.page-about .network-aside,
.page-about .grades-aside,
.page-about .industry-facts {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-about .panel p { margin: 0; font-size: .93rem; color: var(--slate); }
.page-about .panel p + p { margin-top: .7rem; }

/* ---------- 时间轴 ---------- */
.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl__item {
  display: grid;
  gap: 12px;
  padding-bottom: clamp(30px, 5vw, 62px);
}
.page-about .tl__item:last-child { padding-bottom: 0; }

.page-about .tl__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.5rem;
  line-height: 1.1;
  letter-spacing: .03em;
  color: var(--ink);
}

.page-about .tl__card {
  border: var(--bd);
  background: var(--paper-3);
  padding: clamp(16px, 2.4vw, 24px);
  transition: transform .18s ease, border-color .18s ease;
}
.page-about .tl__card:hover {
  transform: translateY(-2px);
  border-color: var(--ink);
}

.page-about .tl__meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.page-about .tl__card h3 {
  margin: 0 0 .55rem;
  font-size: 1.08rem;
  font-weight: 700;
  line-height: 1.45;
}

.page-about .tl__card p {
  margin: 0;
  font-size: .95rem;
  color: var(--slate);
}

@media (min-width: 860px) {
  .page-about .tl__item {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 0;
    align-items: stretch;
  }
  .page-about .tl__year {
    border-right: 1px solid var(--rule);
    padding: 3px 26px 0 0;
    text-align: right;
    font-size: 1.25rem;
    position: relative;
  }
  .page-about .tl__year::after {
    content: "";
    position: absolute;
    right: -4px;
    top: 12px;
    width: 7px;
    height: 7px;
    background: var(--orange);
  }
  .page-about .tl__body { padding-left: 32px; }
}

/* ---------- 城市网络 ---------- */
.page-about .city-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--rule);
  border: var(--bd);
}

.page-about .city {
  background: var(--paper-3);
  padding: 16px 15px 18px;
}
.page-about .city--first { background: var(--paper-2); }

.page-about .city__name {
  display: block;
  font-size: 1.02rem;
  font-weight: 700;
}

.page-about .city__note {
  display: block;
  margin-top: 5px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--index);
}

.page-about .city__flag {
  display: block;
  margin-top: 9px;
  font-size: 11.5px;
  font-weight: 700;
  color: var(--ink);
}
.page-about .city__flag::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-right: 6px;
  vertical-align: 1px;
  background: var(--jade);
}
.page-about .city:not(.city--first) .city__flag::before { background: var(--gold); }

/* ---------- 资质分级 ---------- */
.page-about .grades-layout {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .grades-main .seg__panel { padding-top: 20px; }

.page-about .grade-row {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px dashed var(--rule);
}
.page-about .grade-row:last-child { border-bottom: 0; padding-bottom: 0; }

.page-about .grade-row__key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--index);
}

.page-about .grade-row__val {
  margin: 0;
  font-size: .96rem;
  color: var(--ink);
}

/* ---------- 调度与团队 ---------- */
.page-about .dispatch-lead {
  display: grid;
  gap: clamp(20px, 3.4vw, 34px);
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .dispatch-lead__text p {
  margin: 0 0 1em;
  font-size: .98rem;
  color: var(--ink);
}
.page-about .dispatch-lead__text p:last-child { margin-bottom: 0; }

.page-about .crew {
  display: grid;
  gap: 1px;
  background: var(--rule);
  border: var(--bd);
}

.page-about .crew__cell {
  background: var(--paper-3);
  padding: 20px 18px 22px;
}
.page-about .crew__cell:nth-child(even) { background: var(--paper); }

.page-about .crew__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--orange);
}

.page-about .crew__title {
  margin: 9px 0 7px;
  font-size: 1.05rem;
  font-weight: 700;
}

.page-about .crew__cell > p {
  margin: 0;
  font-size: .92rem;
  color: var(--slate);
}

.page-about .crew__more {
  margin-top: 14px;
  padding-top: 11px;
  border-top: 1px solid var(--rule);
}
.page-about .crew__more summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--ink);
}
.page-about .crew__more summary::-webkit-details-marker { display: none; }
.page-about .crew__more summary::before {
  content: "+ ";
  color: var(--orange);
}
.page-about .crew__more[open] summary::before { content: "- "; }
.page-about .crew__more p {
  margin: 9px 0 0;
  font-size: .88rem;
  color: var(--slate);
}

/* ---------- 保障制度对照 ---------- */
.page-about .then-now {
  display: grid;
  gap: 1px;
  background: var(--rule);
  border: var(--bd);
}

.page-about .tn-col {
  background: var(--paper-3);
  padding: clamp(18px, 3vw, 28px);
}
.page-about .tn-col--before { background: var(--paper-2); }

.page-about .tn-col__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--index);
}
.page-about .tn-col--now .tn-col__title { color: var(--orange); }

.page-about .tn-item {
  margin: 0;
  padding: 12px 0;
  border-top: 1px dashed var(--rule);
  font-size: .94rem;
  color: var(--slate);
}
.page-about .tn-item:first-of-type {
  border-top: 0;
  padding-top: 0;
}
.page-about .tn-col--now .tn-item { color: var(--ink); }

.page-about .assurance-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 22px;
  margin-top: clamp(20px, 3vw, 30px);
  padding-top: clamp(18px, 3vw, 26px);
  border-top: var(--bd);
}
.page-about .assurance-cta p {
  margin: 0;
  flex: 1 1 22rem;
  font-size: .93rem;
  color: var(--slate);
}

/* ---------- 本地协作 ---------- */
.page-about .eco-grid {
  display: grid;
  gap: 1px;
  background: var(--rule);
  border: var(--bd);
}

.page-about .eco-card {
  background: var(--paper-3);
  padding: clamp(18px, 3vw, 26px);
}

.page-about .eco-card__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.55rem;
  line-height: 1.2;
  color: var(--gold);
}

.page-about .eco-card__title {
  margin: 8px 0 9px;
  font-size: 1.05rem;
  font-weight: 700;
}

.page-about .eco-card p {
  margin: 0;
  font-size: .93rem;
  color: var(--slate);
}

/* ---------- 行业参与 ---------- */
.page-about .facts-row {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--rule);
  border: var(--bd);
}

.page-about .fact-row {
  background: var(--paper-2);
  padding: 18px 16px 20px;
}

.page-about .fact-row__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.5rem;
  line-height: 1.2;
  color: var(--ink);
}

.page-about .fact-row__label {
  display: block;
  margin-top: 7px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--slate);
}

/* ---------- 结尾延伸 ---------- */
.page-about .outro {
  background: var(--ink-deep);
  color: var(--paper);
  padding: clamp(44px, 7vw, 80px) 0;
}

.page-about .outro__title {
  margin: 0 0 10px;
  font-size: clamp(1.3rem, 3vw, 1.9rem);
  font-weight: 700;
  line-height: 1.3;
}

.page-about .outro__lead {
  margin: 0 0 clamp(24px, 4vw, 36px);
  max-width: 34rem;
  font-size: .97rem;
  color: rgba(245, 239, 227, .7);
}

.page-about .outro__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(245, 239, 227, .16);
  border: 1px solid rgba(245, 239, 227, .16);
}

.page-about .outro__links > li { background: var(--ink-deep); }

.page-about .outro-link {
  display: block;
  padding: 18px 18px 20px;
  color: var(--paper);
  text-decoration: none;
  transition: background .18s ease;
}
.page-about .outro-link:hover { background: var(--ink); }

.page-about .outro-link__idx {
  display: block;
  margin-bottom: 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .outro-link__label {
  display: block;
  font-weight: 700;
  font-size: 1rem;
}

.page-about .outro-link__desc {
  display: block;
  margin-top: 5px;
  font-size: .85rem;
  color: rgba(245, 239, 227, .6);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .grade-row {
    grid-template-columns: 118px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
  .page-about .facts-row { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .city-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .eco-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-about .outro__links { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 760px) {
  .page-about .crew { grid-template-columns: 1.4fr 1fr 1fr 1fr; }
  .page-about .then-now { grid-template-columns: 1fr 1fr; }
  .page-about .eco-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
  .page-about .dispatch-lead {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: center;
  }
  .page-about .grades-layout {
    grid-template-columns: minmax(0, 1.45fr) minmax(250px, .85fr);
    align-items: start;
  }
}

@media (min-width: 940px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(280px, 1fr);
    align-items: end;
  }
}

@media (min-width: 1040px) {
  .page-about .outro__links { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__card,
  .page-about .outro-link {
    transition: none;
  }
  .page-about .tl__card:hover { transform: none; }
}