.page-about {
  --about-ink-soft: rgba(20, 24, 26, .7);
  --about-line: rgba(108, 74, 46, .22);
  --about-card: #FFFFFF;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  padding-bottom: 72px;
}

.page-about .crumbs {
  padding: 22px 0 0;
  font-size: 13px;
}

.page-about .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--mono);
  letter-spacing: .04em;
  color: var(--about-ink-soft);
}

.page-about .crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--brown);
  opacity: .6;
}

.page-about .crumbs a {
  color: var(--kiwi-deep);
  text-decoration: none;
}

.page-about .crumbs a:hover {
  text-decoration: underline;
}

/* ---------- 首屏 ---------- */
.about-hero {
  position: relative;
  padding: 34px 0 20px;
  isolation: isolate;
}

.about-hero::before {
  content: "";
  position: absolute;
  inset: -20% -10% 25% 35%;
  background:
    radial-gradient(circle at 28% 32%, rgba(56, 178, 75, .20), transparent 62%),
    radial-gradient(circle at 72% 62%, rgba(226, 166, 43, .20), transparent 58%);
  z-index: -1;
  pointer-events: none;
}

.about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--kiwi) 30%, var(--gold) 70%, transparent);
  opacity: .55;
}

.about-hero__grid {
  display: grid;
  gap: 28px;
}

.about-hero__text {
  max-width: 60ch;
  color: var(--about-ink-soft);
}

.about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.about-hero__stamp {
  position: relative;
  overflow: hidden;
  padding: 24px 22px 20px;
  border-radius: 6px 6px 6px 46px;
  background: linear-gradient(150deg, var(--kiwi-deep) 0%, var(--seed) 82%);
  color: var(--core);
}

.about-hero__stamp::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 18% 82%, rgba(245, 231, 168, .22) 0 2px, transparent 2.5px),
    radial-gradient(circle at 62% 22%, rgba(245, 231, 168, .18) 0 2px, transparent 2.5px),
    radial-gradient(circle at 84% 66%, rgba(245, 231, 168, .16) 0 2px, transparent 2.5px);
  background-size: 74px 74px, 96px 96px, 62px 62px;
  opacity: .8;
  pointer-events: none;
}

.about-hero__stamp-k {
  position: relative;
  margin: 0 0 16px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--gold);
}

.about-hero__stats {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 14px;
  margin: 0;
}

.about-stat dt {
  margin-bottom: 4px;
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(245, 231, 168, .72);
}

.about-stat dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 3px;
}

.about-stat__num {
  font-family: var(--sans);
  font-weight: 900;
  font-size: 30px;
  line-height: 1.05;
  color: var(--core);
}

.about-stat__unit {
  font-size: 13px;
  color: var(--gold);
}

/* ---------- 正文骨架 ---------- */
.about-body {
  display: grid;
  gap: 28px;
  margin-top: 34px;
}

.about-index {
  align-self: start;
}

.about-index__title {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--brown);
}

.about-index__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.about-index__link {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  align-items: baseline;
  gap: 6px;
  padding: 9px 10px 9px 12px;
  border-left: 2px solid var(--about-line);
  font-size: 14px;
  color: var(--about-ink-soft);
  text-decoration: none;
  transition: color .22s var(--ease), border-color .22s var(--ease), background .22s var(--ease);
}

.about-index__link:hover {
  color: var(--kiwi-deep);
  background: rgba(56, 178, 75, .07);
}

.about-index__link[data-current] {
  color: var(--kiwi-deep);
  font-weight: 600;
  border-left-color: var(--kiwi);
  background: rgba(56, 178, 75, .1);
}

.about-index__num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--gold);
}

.about-flow {
  min-width: 0;
}

/* ---------- 章节 ---------- */
.about-ch {
  padding: 30px 0 46px;
  border-top: 1px solid var(--about-line);
}

.about-ch:first-child {
  border-top: 0;
  padding-top: 0;
}

.about-ch__head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 16px;
}

.about-ch__num {
  flex: 0 0 auto;
  font-family: var(--mono);
  font-weight: 500;
  font-size: clamp(38px, 8vw, 68px);
  line-height: .95;
  letter-spacing: .02em;
  color: rgba(23, 102, 58, .2);
}

.about-ch__h {
  margin: 4px 0 0;
  font-size: clamp(21px, 3.4vw, 30px);
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -.01em;
}

.about-ch__body p + p {
  margin-top: 12px;
}

.page-about .prose {
  max-width: 66ch;
  color: var(--about-ink-soft);
}

.about-link {
  color: var(--kiwi-deep);
  text-decoration: none;
  border-bottom: 1px solid rgba(56, 178, 75, .5);
  padding-bottom: 1px;
}

.about-link:hover {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

.about-link--light {
  color: var(--gold);
  border-bottom-color: rgba(226, 166, 43, .55);
}

.about-link--light:hover {
  color: var(--core);
  border-bottom-color: var(--core);
}

/* ---------- 图形 ---------- */
.about-fig {
  margin: 20px 0 22px;
  border-radius: 4px 4px 4px 30px;
  overflow: hidden;
}

.about-fig--band {
  margin-top: 26px;
  margin-bottom: 0;
}

/* ---------- 团队 ---------- */
.about-team {
  display: grid;
  gap: 24px;
}

.about-ring {
  margin: 0;
  padding: 18px;
  border-radius: 4px 4px 4px 34px;
  background: linear-gradient(160deg, rgba(245, 231, 168, .5), rgba(56, 178, 75, .09));
  border: 1px solid var(--about-line);
}

.about-ring svg {
  display: block;
  width: 100%;
  max-width: 210px;
  height: auto;
  margin: 0 auto;
}

.about-ring__big {
  font-family: var(--mono);
  font-size: 30px;
  font-weight: 500;
  fill: var(--ink);
}

.about-ring__small {
  font-family: var(--sans);
  font-size: 11px;
  fill: var(--brown);
}

.about-ring__cap {
  display: grid;
  gap: 6px;
  margin-top: 14px;
  font-size: 12px;
  color: var(--about-ink-soft);
}

.about-ring__key {
  display: flex;
  align-items: center;
  gap: 8px;
}

.about-ring__key::before {
  content: "";
  width: 9px;
  height: 9px;
  border-radius: 50% 50% 50% 2px;
  flex: 0 0 auto;
}

.about-ring__key--a::before { background: var(--kiwi); }
.about-ring__key--b::before { background: var(--gold); }
.about-ring__key--c::before { background: var(--brown); }

.about-roles .accordion__trigger {
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr) auto auto;
  align-items: center;
  gap: 10px;
  width: 100%;
  text-align: left;
}

.about-roles__dot {
  width: 12px;
  height: 12px;
  border-radius: 50% 50% 50% 2px;
}

.about-roles__dot--a { background: var(--kiwi); }
.about-roles__dot--b { background: var(--gold); }
.about-roles__dot--c { background: var(--brown); }

.about-roles__name {
  font-weight: 700;
  font-size: 16px;
}

.about-roles__count {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--gold);
  white-space: nowrap;
}

.about-team__fig {
  margin: 0;
  border-radius: 4px 4px 4px 30px;
  overflow: hidden;
}

/* ---------- 版本时间轴 ---------- */
.about-timeline {
  position: relative;
  display: grid;
  gap: 14px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.about-timeline::before {
  content: "";
  position: absolute;
  left: 17px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--kiwi), var(--gold) 62%, rgba(226, 166, 43, .18));
}

.about-tl {
  position: relative;
  padding: 16px 18px 16px 52px;
  background: var(--about-card);
  border: 1px solid rgba(108, 74, 46, .14);
  border-radius: 4px 4px 4px 24px;
  transition: transform .24s var(--ease), box-shadow .24s var(--ease), border-color .24s var(--ease);
}

.about-tl:hover {
  transform: translateY(-3px);
  border-color: rgba(56, 178, 75, .45);
  box-shadow: 0 10px 26px rgba(10, 42, 34, .1);
}

.about-tl__dot {
  position: absolute;
  left: 8px;
  top: 20px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--paper);
  border: 3px solid var(--kiwi);
}

.about-tl--fourth .about-tl__dot {
  border-color: var(--gold);
  background: var(--core);
}

.about-tl__ver {
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--gold);
}

.about-tl__h {
  margin: 4px 0 6px;
  font-size: 17px;
  font-weight: 700;
}

.about-tl .prose {
  font-size: 15px;
}

/* ---------- 深色产能区 ---------- */
.about-capacity {
  margin: 6px 0 40px;
  padding: 38px 22px 34px;
  border-radius: 6px 6px 6px 48px;
  color: var(--core);
}

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

.about-capacity__h {
  margin: 8px 0 10px;
  font-size: clamp(21px, 3.4vw, 29px);
  font-weight: 900;
  line-height: 1.28;
  color: #FFFFFF;
}

.about-capacity__text {
  max-width: 58ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  color: rgba(245, 231, 168, .86);
}

.about-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(178px, 1fr));
  gap: 16px;
  margin-top: 26px;
}

.about-fact {
  padding: 20px 18px;
  border-radius: 4px 4px 4px 26px;
}

.about-fact__num {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 0 0 6px;
  font-weight: 900;
  font-size: 32px;
  line-height: 1.05;
  color: var(--core);
}

.about-fact__unit {
  font-size: 13px;
  font-weight: 400;
  color: var(--gold);
}

.about-fact__k {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--gold);
}

.about-fact__d {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: rgba(255, 255, 255, .78);
}

/* ---------- 区域 ---------- */
.about-radius {
  display: grid;
  gap: 14px;
  margin: 20px 0 22px;
}

.about-radius__cell {
  padding: 18px 18px 16px;
  border-left: 3px solid var(--kiwi);
  background: linear-gradient(120deg, rgba(245, 231, 168, .55), rgba(248, 246, 239, 0) 78%);
  border-radius: 0 4px 4px 0;
}

.about-radius__num {
  margin: 0;
  font-weight: 900;
  font-size: 38px;
  line-height: 1;
  color: var(--kiwi-deep);
}

.about-radius__k {
  margin: 6px 0 6px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--brown);
}

.about-radius__d {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--about-ink-soft);
}

/* ---------- 认可 ---------- */
.about-honor {
  display: grid;
  gap: 12px;
  margin: 4px 0 20px;
}

.about-honor__card {
  padding: 18px 20px;
  border: 1px solid rgba(226, 166, 43, .5);
  border-radius: 4px 4px 4px 26px;
  background: rgba(245, 231, 168, .34);
}

.about-honor__tag {
  margin: 0 0 6px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--wine);
}

.about-honor__t {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
}

.about-plan {
  display: grid;
  gap: 10px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.about-plan__item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 12px 14px;
  border-bottom: 1px solid var(--about-line);
}

.about-plan__num {
  font-family: var(--mono);
  font-size: 15px;
  color: var(--gold);
  letter-spacing: .08em;
}

.about-plan__t {
  margin: 0;
  font-size: 15px;
  line-height: 1.65;
  color: var(--ink);
}

.about-cta {
  margin-top: 28px;
  padding: 26px 22px;
  border-radius: 6px 6px 6px 40px;
  background: linear-gradient(140deg, var(--kiwi-deep), var(--teal) 88%);
  color: var(--core);
}

.about-cta__text {
  margin: 0 0 16px;
  font-size: 17px;
  line-height: 1.6;
  color: #FFFFFF;
}

.about-cta__row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (max-width: 639px) {
  .about-hero__stamp {
    border-radius: 6px 6px 6px 32px;
  }

  .about-ch__head {
    gap: 10px;
  }

  .about-tl {
    padding: 14px 14px 14px 46px;
  }

  .about-roles .accordion__trigger {
    grid-template-columns: 14px minmax(0, 1fr) auto;
  }

  .about-roles__count {
    grid-column: 3;
  }
}

@media (min-width: 640px) {
  .about-radius {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .about-hero__stats {
    gap: 18px 20px;
  }
}

@media (min-width: 900px) {
  .page-about {
    padding-bottom: 96px;
  }

  .about-hero {
    padding: 52px 0 28px;
  }

  .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(280px, .75fr);
    gap: 42px;
    align-items: start;
  }

  .about-body {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 48px;
    margin-top: 46px;
  }

  .about-index {
    position: sticky;
    top: calc(var(--bar) + 20px);
  }

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

  .about-ch {
    padding: 34px 0 54px;
  }

  .about-capacity {
    padding: 48px 40px 42px;
    margin: 10px 0 52px;
  }

  .about-plan {
    grid-template-columns: minmax(0, 1fr);
    max-width: 62ch;
  }
}

@media (min-width: 1100px) {
  .about-team {
    grid-template-columns: 200px minmax(0, 1fr) 250px;
    gap: 26px;
    align-items: start;
  }

  .about-team__fig {
    grid-column: auto;
  }

  .about-body {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: 56px;
  }
}

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

  .about-tl:hover {
    transform: none;
  }
}