.page-about {
  --about-blob-blue: rgba(10, 92, 255, .07);
  --about-blob-amber: rgba(242, 169, 59, .16);
  --about-blob-green: rgba(34, 192, 138, .10);
  padding-bottom: 80px;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  margin: 22px 0 10px;
  font-size: 13px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 26px;
  padding: 12px 0 8px;
}

.page-about .about-hero__main {
  max-width: 44em;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--f-head);
  font-size: clamp(1.85rem, 5vw, 3rem);
  line-height: 1.15;
  letter-spacing: .02em;
  color: var(--c-ink);
}

.page-about .about-hero .lede {
  margin: 16px 0 0;
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--c-body);
}

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

.page-about .about-card {
  background: var(--c-ink);
  color: #fff;
  border-radius: var(--cut);
  padding: 24px;
}

.page-about .about-card__title {
  margin: 0 0 18px;
  font-size: 11px;
  letter-spacing: .2em;
  color: rgba(255, 255, 255, .58);
}

.page-about .about-card dl {
  margin: 0;
  display: grid;
  gap: 15px;
}

.page-about .about-card dt {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: rgba(255, 255, 255, .55);
}

.page-about .about-card dd {
  margin: 4px 0 0;
  font-family: var(--f-head);
  font-size: 1.0625rem;
  letter-spacing: .01em;
}

.page-about .about-card .mono {
  letter-spacing: .08em;
}

/* ---------- 章节间距 ---------- */
.page-about .about-section {
  margin-top: 60px;
}

.page-about .about-section .section-title {
  margin: 0 0 14px;
}

.page-about .about-section .lede {
  max-width: 42em;
  font-size: 1.0125rem;
  line-height: 1.8;
  color: var(--c-body);
}

/* ---------- 运营主体 ---------- */
.page-about .about-operator__grid {
  display: grid;
  gap: 24px;
  margin-top: 22px;
}

.page-about .about-operator__panel p {
  margin: 0 0 1.1em;
  color: var(--c-soft);
  line-height: 1.8;
}

.page-about .about-map {
  display: block;
  width: 100%;
  max-width: 320px;
  height: auto;
  margin: 6px 0 4px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg) var(--r-lg) var(--r-lg) var(--r-sm);
  background: var(--c-white);
}

.page-about .about-contact {
  display: grid;
  gap: 12px;
  margin-top: 22px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.page-about .contact-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
}

.page-about .contact-label {
  flex: 0 0 86px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--c-gray);
}

.page-about .contact-value {
  font-family: var(--f-mono);
  font-size: .9375rem;
  letter-spacing: .04em;
  color: var(--c-ink);
  word-break: break-all;
}

.page-about .copy-btn {
  min-height: 32px;
  padding: 4px 12px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  background: var(--c-white);
  color: var(--c-body);
  font-family: var(--f-body);
  font-size: 12px;
  cursor: pointer;
  transition: border-color var(--t-fast), color var(--t-fast);
}

.page-about .copy-btn:hover {
  border-color: var(--c-signal);
  color: var(--c-signal);
}

.page-about .about-icp {
  margin: 18px 0 0;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--c-gray);
}

.page-about .figure__media {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-lg) var(--r-lg) var(--r-lg) var(--r-sm);
  background: var(--c-mist);
}

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

.page-about .figure__cap {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-gray);
}

/* ---------- 历程时间线 ---------- */
.page-about .about-timeline {
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  z-index: 0;
  left: -30px;
  top: 220px;
  width: 180px;
  height: 260px;
  background: var(--about-blob-amber);
  border-radius: 58% 42% 40% 60% / 52% 48% 52% 48%;
  filter: blur(10px);
  pointer-events: none;
}

.page-about .about-timeline__lede {
  margin-bottom: 26px;
}

.page-about .about-cols {
  display: grid;
  gap: 24px;
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 2px 0 10px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__item {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  background: var(--c-white);
  color: var(--c-body);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color var(--t-fast), color var(--t-fast), transform var(--t-fast);
}

.page-about .about-rail__ver {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--c-signal);
}

.page-about .about-rail__label {
  font-size: 13px;
  color: var(--c-gray);
}

.page-about .about-rail__link:hover {
  border-color: var(--c-signal);
  color: var(--c-signal);
  transform: translateY(-2px);
}

.page-about .about-stages {
  display: grid;
  gap: 20px;
  position: relative;
  z-index: 1;
}

.page-about .stage {
  background: var(--c-white);
  padding: 26px 22px;
}

.page-about .stage__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
}

.page-about .stage__ver {
  font-size: clamp(2rem, 7vw, 2.5rem);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--c-gray);
}

.page-about .stage__title {
  margin: 0;
  font-family: var(--f-head);
  font-size: 1.15rem;
  letter-spacing: .02em;
  color: var(--c-graphite);
}

.page-about .stage p {
  margin: 14px 0 0;
  color: var(--c-soft);
  line-height: 1.8;
}

.page-about .stage__list {
  display: grid;
  gap: 8px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .stage__list li {
  position: relative;
  padding-left: 18px;
  font-size: .95rem;
  line-height: 1.7;
  color: var(--c-body);
}

.page-about .stage__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-silver);
}

.page-about .stage:nth-of-type(1) .stage__ver { color: #8A93A3; }
.page-about .stage:nth-of-type(2) .stage__ver { color: #5C6E93; }
.page-about .stage:nth-of-type(3) .stage__ver { color: #34558F; }
.page-about .stage:nth-of-type(4) .stage__ver { color: #1A4EBF; }
.page-about .stage:nth-of-type(5) .stage__ver { color: var(--c-signal); }

.page-about .stage:nth-of-type(4) .stage__list li::before { background: rgba(10, 92, 255, .45); }
.page-about .stage:nth-of-type(5) .stage__list li::before { background: var(--c-signal); }

.page-about .about-stage-fig {
  margin: 0;
}

/* ---------- 团队 ---------- */
.page-about .about-team__panel {
  padding: 26px 22px;
  margin-top: 22px;
}

.page-about .about-team__fig {
  margin: 0 0 24px;
}

.page-about .about-team__intro {
  margin: 0 0 18px;
  color: var(--c-soft);
  line-height: 1.8;
}

.page-about .accordion {
  border-top: 1px solid var(--line);
}

.page-about .accordion__item {
  border-bottom: 1px solid var(--line);
}

.page-about .accordion__trigger {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  min-height: 56px;
  padding: 14px 4px;
  border: 0;
  background: none;
  font-family: var(--f-head);
  font-size: 1.05rem;
  letter-spacing: .02em;
  color: var(--c-graphite);
  text-align: left;
  cursor: pointer;
  transition: color var(--t-fast);
}

.page-about .accordion__trigger:hover {
  color: var(--c-signal);
}

.page-about .accordion__index {
  flex: 0 0 auto;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-signal);
}

.page-about .accordion__chev {
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  margin-left: auto;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg);
  transition: transform var(--t-base);
}

.page-about .accordion__trigger[aria-expanded="true"] .accordion__chev {
  transform: rotate(-135deg);
}

.page-about .accordion__panel {
  padding: 0 4px 20px 36px;
  color: var(--c-soft);
}

.page-about .accordion__panel ul {
  margin: 0;
  padding: 0 0 0 18px;
  display: grid;
  gap: 8px;
}

.page-about .accordion__panel li {
  line-height: 1.75;
  font-size: .95rem;
}

/* ---------- 维护要求 ---------- */
.page-about .rules {
  margin: 26px 0 0;
}

.page-about .rules__row {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.page-about .rules__row:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .rules__k {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-signal);
}

.page-about .rules__v {
  margin: 0;
  font-size: .975rem;
  line-height: 1.8;
  color: var(--c-soft);
}

/* ---------- 外部协作 ---------- */
.page-about .about-partners__grid {
  display: grid;
  gap: 0;
  margin-top: 22px;
}

.page-about .partner {
  position: relative;
  padding: 20px 0 20px 20px;
  border-top: 1px solid var(--line);
}

.page-about .partner:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .partner::before {
  content: "";
  position: absolute;
  left: 0;
  top: 24px;
  width: 3px;
  height: 28px;
  border-radius: var(--r-pill);
  background: var(--c-signal);
}

.page-about .partner__k {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--c-gray);
}

.page-about .partner__v {
  margin: 0;
  color: var(--c-soft);
  line-height: 1.8;
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  position: relative;
}

.page-about .about-next::before {
  content: "";
  position: absolute;
  z-index: 0;
  right: -20px;
  bottom: -30px;
  width: 200px;
  height: 200px;
  background: var(--about-blob-green);
  border-radius: 46% 54% 62% 38% / 54% 46% 54% 46%;
  filter: blur(12px);
  pointer-events: none;
}

.page-about .about-next__list {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-next__link {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 18px;
  min-height: 44px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg) var(--r-lg) var(--r-lg) var(--r-sm);
  background: var(--c-white);
  text-decoration: none;
  transition: transform var(--t-fast), border-color var(--t-fast);
}

.page-about .about-next__link:hover {
  transform: translateY(-2px);
  border-color: var(--c-signal);
}

.page-about .about-next__num {
  flex: 0 0 auto;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-signal);
}

.page-about .about-next__text {
  color: var(--c-graphite);
  font-size: .975rem;
  line-height: 1.7;
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-about .about-operator__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .rules__row {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
    padding: 20px 0;
  }

  .page-about .about-partners__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px;
  }

  .page-about .partner {
    padding: 20px 0 0;
    border-top: 1px solid var(--line);
    border-bottom: 0;
  }

  .page-about .partner:last-child {
    border-bottom: 0;
  }

  .page-about .partner::before {
    top: 20px;
    width: 28px;
    height: 3px;
    left: 0;
  }

  .page-about .partner__k {
    padding-top: 14px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: start;
    padding: 28px 0 12px;
  }

  .page-about .about-card {
    padding: 28px;
  }

  .page-about .about-section {
    margin-top: 84px;
  }

  .page-about .about-cols {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: 44px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 120px;
    align-self: start;
  }

  .page-about .about-rail__list {
    display: block;
    overflow: visible;
    padding: 0;
    border-left: 1px solid var(--line-strong);
  }

  .page-about .about-rail__item + .about-rail__item {
    margin-top: 4px;
  }

  .page-about .about-rail__link {
    position: relative;
    min-height: 0;
    padding: 12px 0 12px 20px;
    border: 0;
    border-radius: 0;
    background: transparent;
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
  }

  .page-about .about-rail__link::before {
    content: "";
    position: absolute;
    left: -5px;
    top: 18px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--c-silver);
    border: 1px solid var(--c-white);
    box-shadow: 0 0 0 1px var(--line-strong);
    transition: background var(--t-fast);
  }

  .page-about .about-rail__link:hover {
    transform: none;
  }

  .page-about .about-rail__link:hover::before {
    background: var(--c-signal);
  }

  .page-about .about-stages {
    gap: 24px;
  }

  .page-about .stage {
    padding: 30px 32px;
    transition: transform var(--t-fast), border-color var(--t-fast);
  }

  .page-about .stage:nth-of-type(1) { margin-left: 0; }
  .page-about .stage:nth-of-type(2) { margin-left: 6px; }
  .page-about .stage:nth-of-type(3) { margin-left: 12px; }
  .page-about .stage:nth-of-type(4) { margin-left: 18px; }
  .page-about .stage:nth-of-type(5) { margin-left: 24px; }

  .page-about .stage:hover {
    transform: translateY(-2px);
    border-color: var(--c-signal);
  }

  .page-about .about-stage-fig {
    max-width: 420px;
    margin-left: auto;
  }

  .page-about .about-team__panel {
    display: grid;
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: 24px 40px;
    padding: 32px;
  }

  .page-about .about-team__fig {
    grid-row: 1 / span 2;
    margin: 0;
  }

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

  .page-about .accordion {
    align-self: start;
  }

  .page-about .about-operator__panel {
    padding: 32px;
  }

  .page-about .about-next__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-next__link,
  .page-about .about-rail__link,
  .page-about .stage,
  .page-about .accordion__chev {
    transition: none;
  }

  .page-about .about-next__link:hover,
  .page-about .about-rail__link:hover,
  .page-about .stage:hover {
    transform: none;
  }
}