.page-about {
  --about-marker: 2.75rem;
  --about-shadow: 6px 6px 0 rgba(20, 22, 28, .88);
  --about-gap: clamp(3.25rem, 6vw, 4.5rem);
  background: var(--paper);
  color: var(--ink);
}

.page-about [id] {
  scroll-margin-top: calc(var(--header-h) + 4.5rem);
}

/* ---------- 首屏：斜切红块 + 棋盘纹理 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--night);
  color: var(--paper);
  padding-top: calc(var(--header-h) + 2rem);
  padding-bottom: clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -2;
  top: -32%;
  right: -16%;
  width: 80%;
  height: 175%;
  background: linear-gradient(168deg, var(--red) 0%, var(--red) 57%, transparent 57.4%);
  transform: skewX(-10deg);
  opacity: .88;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  left: 0;
  bottom: 0;
  width: min(560px, 72%);
  height: 150px;
  background-image: repeating-conic-gradient(from 0deg, rgba(217, 164, 25, .6) 0 25%, transparent 0 50%);
  background-size: 44px 44px;
  opacity: .2;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000);
  mask-image: linear-gradient(90deg, transparent, #000);
}

.page-about .about-hero .breadcrumbs {
  font-size: .8125rem;
  letter-spacing: .04em;
  color: rgba(244, 237, 226, .62);
}

.page-about .about-hero .breadcrumbs a {
  color: var(--gold);
  text-decoration: none;
}

.page-about .about-hero .breadcrumbs a:hover,
.page-about .about-hero .breadcrumbs a:focus-visible {
  text-decoration: underline;
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.75rem);
  align-items: center;
  margin-top: clamp(1.25rem, 3.5vw, 2.25rem);
}

.page-about .about-hero__copy .display-title {
  color: var(--paper);
  max-width: 20ch;
}

.page-about .about-hero__copy .lede {
  margin-top: 1rem;
  max-width: 46ch;
  color: rgba(244, 237, 226, .8);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: clamp(1.25rem, 3vw, 1.85rem);
}

.page-about .about-hero__actions .btn--ghost {
  color: var(--paper);
  border-color: rgba(244, 237, 226, .58);
}

.page-about .about-hero__media {
  margin: 0;
  aspect-ratio: 8 / 3;
  border-color: var(--paper);
  box-shadow: 9px 9px 0 rgba(217, 164, 25, .42);
}

/* ---------- 首屏数据条 ---------- */
.page-about .about-stats {
  list-style: none;
  margin: clamp(2rem, 4.5vw, 3rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  background: var(--gold);
  border: 2px solid rgba(244, 237, 226, .5);
}

.page-about .about-stat {
  background: var(--night);
  padding: 1rem 1.05rem 1.15rem;
  display: grid;
  gap: .3rem;
  align-content: start;
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.75rem, 4.6vw, 2.4rem);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-stat__unit {
  font-size: .5em;
  margin-left: .12em;
}

.page-about .about-stat__label {
  font-size: .8125rem;
  letter-spacing: .05em;
  color: rgba(244, 237, 226, .74);
}

/* ---------- 章节快速跳转 ---------- */
.page-about .about-jump {
  position: sticky;
  top: var(--header-h);
  z-index: 5;
  background: var(--paper-2);
  border-top: 3px solid var(--ink);
  border-bottom: 3px solid var(--ink);
}

.page-about .about-jump__inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding-block: .6rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-jump__inner::-webkit-scrollbar {
  height: 0;
}

.page-about .about-jump__label {
  flex: none;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .18em;
  color: var(--red);
}

.page-about .about-jump__list {
  list-style: none;
  display: flex;
  flex-wrap: nowrap;
  gap: .5rem;
  margin: 0;
  padding: 0;
}

.page-about .about-jump__list a {
  display: inline-block;
  white-space: nowrap;
  padding: .34rem .8rem;
  border: 2px solid var(--ink);
  background: var(--paper);
  color: var(--ink);
  font-size: .8125rem;
  letter-spacing: .04em;
  text-decoration: none;
  transition: background-color 200ms var(--ease), color 200ms var(--ease);
}

.page-about .about-jump__list a:hover,
.page-about .about-jump__list a:focus-visible {
  background: var(--ink);
  color: var(--paper);
}

/* ---------- 发展历程时间轴 ---------- */
.page-about .about-journey__intro {
  max-width: 64ch;
  margin-bottom: clamp(1.85rem, 4vw, 2.75rem);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: clamp(1.6rem, 4vw, 2.6rem);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: calc(var(--about-marker) / 2 - 1.5px);
  top: 8px;
  bottom: 8px;
  width: 3px;
  background: linear-gradient(180deg, var(--red) 0%, var(--gold) 52%, var(--emerald) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: calc(var(--about-marker) + 1.75rem);
  min-height: var(--about-marker);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: calc(var(--about-marker) - 2px);
  top: calc(var(--about-marker) / 2 - 1.5px);
  width: 1.75rem;
  height: 3px;
  background: var(--red);
  transform-origin: left center;
  transform: rotate(-9deg);
}

.page-about .about-timeline__marker {
  position: absolute;
  left: 0;
  top: 0;
  width: var(--about-marker);
  height: var(--about-marker);
  display: grid;
  place-items: center;
  background: var(--night);
  color: var(--gold);
  border: 3px solid var(--gold);
  border-radius: 50%;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: .6875rem;
  font-weight: 700;
  letter-spacing: -.02em;
}

.page-about .about-timeline__title {
  margin: 0 0 .5rem;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(1.0625rem, 2.4vw, 1.375rem);
  line-height: 1.35;
}

.page-about .about-timeline__body p {
  margin: 0;
  max-width: 58ch;
  font-size: 1rem;
  line-height: 1.75;
  color: #2f333b;
}

/* ---------- 数据来源 ---------- */
.page-about .about-sources {
  background: var(--paper-2);
}

.page-about .about-sources__head {
  max-width: 64ch;
}

.page-about .about-sources__layout {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
}

.page-about .about-chain {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-chain__item {
  background: var(--paper);
  border: 3px solid var(--ink);
  box-shadow: var(--about-shadow);
  padding: 1.05rem 1.2rem 1.2rem;
}

.page-about .about-chain__idx {
  display: block;
  margin-bottom: .55rem;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--red);
}

.page-about .about-chain__title {
  margin: 0 0 .45rem;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 1.0625rem;
  line-height: 1.4;
}

.page-about .about-chain__item p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.7;
  color: #343841;
}

.page-about .about-sources__media {
  margin: 0;
  aspect-ratio: 3 / 2;
  border-color: var(--ink);
  box-shadow: var(--about-shadow);
}

/* ---------- 大字结论带 ---------- */
.page-about .about-band {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: clamp(1rem, 3vw, 2rem);
  margin-top: clamp(2rem, 5vw, 3rem);
  padding: clamp(1.25rem, 3vw, 2rem) clamp(1.25rem, 3vw, 2.25rem);
  background: var(--night);
  border-left: 8px solid var(--red);
  box-shadow: 8px 8px 0 rgba(20, 22, 28, .22);
}

.page-about .about-band .band-number {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(3rem, 9vw, 4.5rem);
  font-weight: 700;
  line-height: .9;
  color: var(--gold);
}

.page-about .about-band .band-number span {
  font-size: .42em;
  margin-left: .1em;
  color: var(--emerald-bright);
}

.page-about .about-band .band-text {
  margin: 0;
  max-width: 52ch;
  font-size: 1rem;
  line-height: 1.75;
  color: rgba(244, 237, 226, .86);
}

/* ---------- 团队分工 ---------- */
.page-about .about-team__layout {
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.75rem);
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
  align-items: start;
}

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

.page-about .about-donut__svg {
  display: block;
  width: min(100%, 320px);
  height: auto;
}

.page-about .about-donut__num {
  font-family: var(--font-mono);
  font-size: 42px;
  font-weight: 700;
  fill: var(--ink);
}

.page-about .about-donut__unit {
  font-family: var(--font-sans);
  font-size: 13px;
  letter-spacing: .05em;
  fill: var(--slate);
}

.page-about .about-donut__legend {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: grid;
  gap: .5rem;
}

.page-about .about-donut__legend li {
  display: flex;
  align-items: center;
  gap: .55rem;
  font-size: .875rem;
  line-height: 1.5;
  color: #33373f;
}

.page-about .about-donut__dot {
  flex: none;
  width: .8rem;
  height: .8rem;
  border: 2px solid var(--ink);
}

.page-about .about-team__items {
  display: grid;
  gap: .75rem;
}

.page-about .about-team__item summary {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 1.0625rem;
}

.page-about .about-team__item .disclosure-body p {
  margin: 0 0 .6rem;
  line-height: 1.72;
}

.page-about .about-team__item .disclosure-body ul {
  margin: 0;
  padding-left: 1.1rem;
}

.page-about .about-team__item .disclosure-body li {
  margin-bottom: .3rem;
  font-size: .9375rem;
  line-height: 1.65;
  color: #343841;
}

/* ---------- 服务范围与更新节奏 ---------- */
.page-about .about-reach {
  background: var(--ink);
  color: var(--paper);
}

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

.page-about .about-reach .section-title {
  color: var(--paper);
  max-width: 22ch;
}

.page-about .about-reach__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  align-items: center;
}

.page-about .about-reach__text {
  margin: 1rem 0 0;
  max-width: 54ch;
  font-size: 1rem;
  line-height: 1.78;
  color: rgba(244, 237, 226, .8);
}

.page-about .about-cities {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: 1.25rem 0 0;
  padding: 0;
}

.page-about .about-cities li {
  padding: .34rem .78rem;
  border: 2px solid rgba(244, 237, 226, .42);
  color: var(--paper);
  font-size: .875rem;
  letter-spacing: .04em;
}

.page-about .about-reach__media {
  margin: 0;
  aspect-ratio: 4 / 3;
  border-color: var(--gold);
  box-shadow: 9px 9px 0 rgba(217, 164, 25, .3);
}

.page-about .about-reach__table {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
  padding: 1rem 1.1rem 1.25rem;
  background: var(--paper);
  color: var(--ink);
  border: 3px solid var(--gold);
  box-shadow: 9px 9px 0 rgba(217, 164, 25, .3);
  overflow-x: auto;
}

.page-about .about-reach__table .data-table {
  min-width: 520px;
}

/* ---------- 合作与认可 ---------- */
.page-about .about-partners__grid {
  display: grid;
  gap: 1rem;
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
}

.page-about .about-partner-stat {
  background: var(--paper);
  border: 3px solid var(--ink);
  box-shadow: var(--about-shadow);
  padding: 1.1rem 1.2rem 1.25rem;
}

.page-about .about-partner-stat__num {
  display: block;
  margin-bottom: .5rem;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2.25rem, 5.5vw, 3rem);
  font-weight: 700;
  line-height: 1;
  color: var(--gold-deep);
}

.page-about .about-partner-stat p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.7;
  color: #343841;
}

.page-about .about-awards {
  list-style: none;
  margin: clamp(1.5rem, 3.5vw, 2.25rem) 0 0;
  padding: 0;
  display: grid;
  gap: .85rem;
  border-top: 3px solid var(--ink);
  padding-top: clamp(1.25rem, 3vw, 1.75rem);
}

.page-about .about-awards li {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .75rem;
}

.page-about .about-awards p {
  margin: 0;
  flex: 1 1 20ch;
  font-size: .9375rem;
  line-height: 1.7;
  color: #343841;
}

/* ---------- 页尾导流 ---------- */
.page-about .about-next {
  background: var(--paper-2);
}

.page-about .about-next__grid {
  display: grid;
  gap: 1rem;
  margin-top: clamp(1.5rem, 3.5vw, 2.25rem);
}

.page-about .about-next__card {
  display: grid;
  gap: .45rem;
  padding: 1.15rem 1.25rem 1.3rem;
  background: var(--paper);
  border: 3px solid var(--ink);
  color: var(--ink);
  text-decoration: none;
  transition: transform 220ms var(--ease), box-shadow 220ms var(--ease), background-color 220ms var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  transform: translate(-3px, -3px);
  box-shadow: var(--about-shadow);
  background: #fffaf1;
}

.page-about .about-next__k {
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .18em;
  color: var(--red);
}

.page-about .about-next__t {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 1.0625rem;
  line-height: 1.45;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 700px) {
  .page-about .about-chain {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
  }

  .page-about .about-team__layout {
    grid-template-columns: minmax(240px, 320px) minmax(0, 1fr);
  }
}

@media (min-width: 960px) {
  .page-about .about-sources__layout {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    align-items: start;
  }

  .page-about .about-reach__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, .85fr);
  }
}

@media (min-width: 1040px) {
  .page-about .about-timeline::before {
    left: 50%;
    margin-left: -1.5px;
  }

  .page-about .about-timeline__item {
    width: calc(50% - 3.25rem);
    padding-left: 0;
  }

  .page-about .about-timeline__item::before {
    display: none;
  }

  .page-about .about-timeline__item:nth-child(odd) {
    margin-right: auto;
    text-align: right;
  }

  .page-about .about-timeline__item:nth-child(even) {
    margin-left: auto;
  }

  .page-about .about-timeline__item:nth-child(odd) .about-timeline__body p {
    margin-left: auto;
  }

  .page-about .about-timeline__item:nth-child(odd) .about-timeline__marker {
    left: auto;
    right: calc(-1 * (3.25rem + var(--about-marker) / 2));
  }

  .page-about .about-timeline__item:nth-child(even) .about-timeline__marker {
    left: calc(-1 * (3.25rem + var(--about-marker) / 2));
    right: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-jump__list a,
  .page-about .about-next__card {
    transition: none;
  }

  .page-about .about-next__card:hover,
  .page-about .about-next__card:focus-visible {
    transform: none;
  }
}