.page-about {
  --about-hair: 1px solid rgba(107, 74, 47, .22);
  --about-gold-line: 1px solid rgba(192, 138, 46, .45);
  background: var(--board);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.8;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 3.5rem) 0 4.25rem;
  color: var(--board);
  background:
    radial-gradient(110% 80% at 94% 0%, rgba(242, 193, 78, .26), transparent 55%),
    radial-gradient(90% 70% at 2% 100%, rgba(31, 111, 120, .34), transparent 62%),
    linear-gradient(165deg, #8E2419 0%, #7a1c13 48%, #4f100a 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(58% 42% at 76% 6%, rgba(255, 236, 190, .18), transparent 70%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 8px;
  background: repeating-linear-gradient(90deg,
    var(--flag-red) 0 40px,
    var(--ochre) 40px 80px,
    var(--butter) 80px 120px,
    var(--tk-blue) 120px 160px,
    var(--tk-green) 160px 200px,
    var(--deep-red) 200px 240px);
}

.page-about .about-hero .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .35rem;
  margin-bottom: 1.75rem;
  font-family: var(--mono);
  font-size: .8125rem;
  letter-spacing: .04em;
  color: rgba(245, 237, 225, .68);
}

.page-about .about-hero .breadcrumb a {
  color: rgba(245, 237, 225, .92);
  text-decoration: none;
  border-bottom: 1px solid rgba(242, 193, 78, .5);
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-hero .breadcrumb a:hover,
.page-about .about-hero .breadcrumb a:focus-visible {
  color: var(--butter);
  border-bottom-color: var(--butter);
}

.page-about .about-hero__kicker {
  margin: 0 0 1rem;
  font-family: var(--mono);
  font-size: .8125rem;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--butter);
}

.page-about .about-hero__title {
  margin: 0 0 1.25rem;
  max-width: 16ch;
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(2.05rem, 7vw, 4.15rem);
  line-height: 1.12;
  letter-spacing: -.02em;
  color: #FBF6EE;
}

.page-about .about-hero__lede {
  max-width: 52ch;
  margin: 0 0 2.25rem;
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  line-height: 1.9;
  color: rgba(245, 237, 225, .9);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .6rem 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(242, 193, 78, .35);
  font-family: var(--mono);
  font-size: .8125rem;
  letter-spacing: .04em;
}

.page-about .about-hero__meta span {
  padding-right: 1rem;
  color: var(--butter);
  border-right: 1px solid rgba(242, 193, 78, .35);
}

.page-about .about-hero__meta a {
  padding: .15rem .05rem;
  color: rgba(245, 237, 225, .82);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-hero__meta a:hover,
.page-about .about-hero__meta a:focus-visible {
  color: var(--butter);
  border-bottom-color: var(--butter);
}

/* ============ 通用文字层级 ============ */
.page-about .about-kicker {
  margin: 0 0 .75rem;
  font-family: var(--mono);
  font-size: .8125rem;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--deep-red);
}

.page-about .about-kicker--light {
  color: var(--butter);
}

.page-about .about-h2 {
  margin: 0 0 1rem;
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.6vw, 2.25rem);
  line-height: 1.26;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .about-h2--light {
  color: var(--paper);
}

.page-about .about-h3 {
  margin: 0 0 .5rem;
  font-family: var(--serif);
  font-weight: 800;
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-lede {
  max-width: 58ch;
  margin: 0 0 2.25rem;
  font-size: 1.0625rem;
  line-height: 1.9;
  color: var(--stone);
}

.page-about .about-lede--light {
  color: rgba(245, 237, 225, .82);
}

.page-about .about-p {
  max-width: 62ch;
  margin: 0 0 1.15rem;
  font-size: 1rem;
  line-height: 1.9;
  color: rgba(28, 20, 16, .82);
}

/* ============ 起步 / 两栏 ============ */
.page-about .about-origin {
  padding: clamp(3rem, 7vw, 5.5rem) 0;
  background: var(--paper);
}

.page-about .about-split {
  display: grid;
  gap: 2.25rem;
}

.page-about .about-rail__label {
  margin: 0 0 1.25rem;
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .2em;
  color: var(--wood);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 1.25rem;
  border-left: 1px solid rgba(192, 138, 46, .5);
  display: grid;
  gap: 1.6rem;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  top: .5rem;
  left: -1.25rem;
  width: 9px;
  height: 9px;
  background: var(--paper);
  border: 1px solid var(--ochre);
  transform: translateX(-50%) rotate(45deg);
}

.page-about .about-timeline__year {
  display: block;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: .03em;
  color: var(--deep-red);
}

.page-about .about-timeline__note {
  margin: .35rem 0 0;
  font-size: .875rem;
  line-height: 1.7;
  color: var(--stone);
}

.page-about .about-figure {
  margin: 2rem 0 0;
  border: var(--about-hair);
  background: var(--board);
}

.page-about .about-figure--chart {
  margin-top: 3rem;
}

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

.page-about .figure__cap {
  padding: .7rem .9rem;
  font-family: var(--mono);
  font-size: .75rem;
  letter-spacing: .03em;
  line-height: 1.6;
  color: var(--stone);
}

/* ============ 版本线 / 标签页 ============ */
.page-about .about-lines {
  padding: clamp(3rem, 7vw, 5.5rem) 0;
  background: var(--board);
  border-top: var(--about-gold-line);
}

.page-about .about-tablist {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 1.75rem;
  padding-bottom: 1rem;
  border-bottom: var(--about-gold-line);
}

.page-about .tab-btn {
  padding: .55rem 1rem;
  font-family: var(--mono);
  font-size: .8125rem;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--wood);
  background: transparent;
  border: 1px solid rgba(107, 74, 47, .3);
  border-radius: 0;
  cursor: pointer;
  transition: background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .tab-btn:hover {
  color: var(--deep-red);
  border-color: var(--ochre);
}

.page-about .tab-btn[aria-selected="true"] {
  color: var(--paper);
  background: var(--deep-red);
  border-color: var(--deep-red);
}

.page-about .about-panel {
  padding: .25rem 0 0;
}

.page-about .about-panel h3 {
  margin: 0 0 .75rem;
  font-family: var(--serif);
  font-weight: 800;
  font-size: clamp(1.15rem, 2.2vw, 1.45rem);
  line-height: 1.4;
  color: var(--deep-red);
}

.page-about .about-panel p {
  max-width: 64ch;
  margin: 0;
  font-size: 1rem;
  line-height: 1.9;
  color: rgba(28, 20, 16, .82);
}

/* ============ 团队 ============ */
.page-about .about-team {
  padding: clamp(3rem, 7vw, 5.5rem) 0;
  color: var(--paper);
  background:
    radial-gradient(90% 60% at 6% 0%, rgba(242, 193, 78, .16), transparent 60%),
    linear-gradient(180deg, #251a13 0%, #1C1410 100%);
}

.page-about .about-crews {
  display: grid;
  gap: 1px;
  background: rgba(192, 138, 46, .35);
  border: 1px solid rgba(192, 138, 46, .35);
}

.page-about .about-crew {
  padding: 1.75rem 1.4rem 2rem;
  background: #1C1410;
}

.page-about .about-crew__no {
  margin: 0 0 .9rem;
  font-family: var(--mono);
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--butter);
}

.page-about .about-crew__title {
  margin: 0 0 .65rem;
  font-family: var(--serif);
  font-weight: 800;
  font-size: 1.15rem;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-crew__text {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.85;
  color: rgba(245, 237, 225, .78);
}

/* ============ 拉萨服务点 ============ */
.page-about .about-lhasa {
  padding: clamp(3rem, 7vw, 5.5rem) 0 0;
  background: var(--paper);
}

.page-about .about-lhasa__figure {
  margin: 2.5rem 0 0;
  border-top: var(--about-gold-line);
  border-bottom: var(--about-gold-line);
  background: var(--board);
}

.page-about .about-lhasa__figure img {
  display: block;
  width: 100%;
  height: clamp(14rem, 46vw, 28rem);
  object-fit: cover;
}

.page-about .about-lhasa__figure .figure__cap {
  padding: .7rem var(--gutter);
  background: var(--paper);
}

.page-about .about-lhasa__cols {
  display: grid;
  gap: 1.75rem;
  padding: 2.75rem 0 clamp(3rem, 7vw, 5.5rem);
}

.page-about .about-lhasa__col p {
  margin: 0;
  max-width: 46ch;
  font-size: .9688rem;
  line-height: 1.9;
  color: rgba(28, 20, 16, .82);
}

/* ============ 入库流程 ============ */
.page-about .about-flow {
  padding: clamp(3rem, 7vw, 5.5rem) 0;
  background: var(--board);
  border-top: var(--about-gold-line);
}

.page-about .about-steps {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  border-top: var(--about-gold-line);
}

.page-about .about-step {
  padding: 1.5rem 0;
  border-bottom: var(--about-gold-line);
}

.page-about .about-step__no {
  display: block;
  margin-bottom: .4rem;
  font-family: var(--mono);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--ochre);
}

.page-about .about-step__title {
  margin: 0 0 .45rem;
  font-family: var(--serif);
  font-weight: 800;
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-step__text {
  margin: 0;
  max-width: 66ch;
  font-size: .9688rem;
  line-height: 1.9;
  color: rgba(28, 20, 16, .8);
}

.page-about .about-flow__note {
  max-width: 66ch;
  margin: 2rem 0 0;
  padding-left: 1.1rem;
  border-left: 3px solid var(--butter);
  font-size: .9688rem;
  line-height: 1.9;
  color: var(--stone);
}

/* ============ 数字 ============ */
.page-about .about-numbers {
  padding: clamp(3rem, 7vw, 5.5rem) 0;
  color: var(--paper);
  background:
    radial-gradient(85% 65% at 100% 0%, rgba(192, 138, 46, .24), transparent 60%),
    linear-gradient(180deg, #8E2419 0%, #6d1a12 100%);
}

.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
}

.page-about .about-stat {
  padding: 1.5rem 1.35rem 1.75rem;
  border: 1px solid rgba(242, 193, 78, .38);
  background: rgba(28, 20, 16, .16);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--mono);
  font-size: clamp(2rem, 5.5vw, 3rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--butter);
}

.page-about .about-stat__num small {
  margin-left: .15em;
  font-size: .45em;
  letter-spacing: 0;
}

.page-about .about-stat__label {
  margin: .8rem 0 0;
  font-size: .875rem;
  line-height: 1.75;
  color: rgba(245, 237, 225, .82);
}

/* ============ 收尾延伸 ============ */
.page-about .about-more {
  padding: clamp(3rem, 7vw, 5rem) 0;
  background: var(--board);
}

.page-about .about-more__note {
  margin-bottom: 2.75rem;
  padding: 1.1rem 1.25rem;
  border: var(--about-gold-line);
  border-left: 4px solid var(--butter);
  background: var(--paper);
}

.page-about .about-more__note p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: rgba(28, 20, 16, .85);
}

.page-about .about-more__note strong {
  color: var(--deep-red);
}

.page-about .about-links {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(107, 74, 47, .22);
  border: var(--about-hair);
}

.page-about .about-links li {
  background: var(--board);
}

.page-about .about-links a {
  display: block;
  padding: 1.1rem 1.25rem;
  font-size: .9688rem;
  line-height: 1.6;
  color: var(--ink);
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: border-color .2s var(--ease), background .2s var(--ease), color .2s var(--ease);
}

.page-about .about-links a:hover,
.page-about .about-links a:focus-visible {
  color: var(--deep-red);
  background: var(--paper);
  border-left-color: var(--flag-red);
}

/* ============ 响应式 ============ */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-lhasa__cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 3rem;
  }

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

@media (min-width: 780px) {
  .page-about .about-crews {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-step {
    display: grid;
    grid-template-columns: 4.5rem minmax(0, 1fr);
    gap: 0 2rem;
    align-items: start;
    padding: 1.75rem 0;
  }

  .page-about .about-step__no {
    grid-column: 1;
    grid-row: 1 / span 2;
    margin-bottom: 0;
    padding-top: .1rem;
    font-size: 1.6rem;
  }

  .page-about .about-step__title {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .about-step__text {
    grid-column: 2;
    grid-row: 2;
  }
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: 13.5rem minmax(0, 1fr);
    gap: 4rem;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 2rem);
  }
}

@media (min-width: 980px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }
}