.page-about {
  background: var(--ink-950);
  color: var(--white);
  overflow-x: hidden;
}

.page-about .about-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 28px 20px 0;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--slate);
}

.page-about .about-crumbs .breadcrumbs__link {
  color: var(--slate);
  text-decoration: none;
  transition: color .2s var(--ease);
}

.page-about .about-crumbs .breadcrumbs__link:hover {
  color: var(--green);
}

.page-about .about-crumbs [aria-current="page"] {
  color: var(--white);
}

/* ---------- 封面首屏 ---------- */
.page-about .about-hero {
  padding-top: 32px;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 9.5vw, 72px);
  line-height: 1.05;
  letter-spacing: -0.025em;
  margin: 16px 0 0;
  max-width: 15em;
}

.page-about .about-hero .lede {
  margin-top: 24px;
  max-width: 44em;
  color: var(--slate);
}

.page-about .about-hero__grid {
  margin-top: 56px;
  display: grid;
  gap: 36px;
}

.page-about .about-hero__note {
  border-left: 2px solid var(--green);
  padding-left: 20px;
  color: var(--white);
  font-size: 16px;
  line-height: 1.75;
}

.page-about .about-hero__note p {
  margin: 0;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(122px, 1fr));
  gap: 20px 16px;
  border-top: 1px solid var(--steel);
  padding-top: 24px;
}

/* ---------- 起点 ---------- */
.page-about .about-origin__grid {
  display: grid;
  gap: 44px;
}

.page-about .about-origin__text p {
  margin-top: 18px;
  color: #d5deea;
}

.page-about .about-origin__points {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--steel);
}

.page-about .about-origin__points li {
  background: var(--ink-950);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
  padding: 16px 4px;
}

.page-about .about-origin__k {
  color: var(--green);
  font-size: 13px;
  letter-spacing: .04em;
  min-width: 116px;
}

.page-about .about-origin__v {
  color: var(--white);
  font-size: 15px;
}

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

.page-about .about-origin__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .about-origin__media .media__caption {
  margin-top: 12px;
  font-size: 13px;
  color: var(--slate);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline .lede {
  color: var(--slate);
  max-width: 40em;
}

.page-about .about-tl {
  list-style: none;
  margin: 52px 0 0;
  padding: 0;
}

.page-about .about-tl__item {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 0 16px;
  padding-bottom: 52px;
}

.page-about .about-tl__item:last-child {
  padding-bottom: 0;
}

.page-about .about-tl__scale {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.page-about .about-tl__scale::after {
  content: "";
  position: absolute;
  top: 42px;
  bottom: -52px;
  left: 50%;
  width: 1px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, var(--steel) 0%, rgba(42, 63, 99, .25) 100%);
}

.page-about .about-tl__item:last-child .about-tl__scale::after {
  display: none;
}

.page-about .about-tl__num {
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--slate);
}

.page-about .about-tl__node {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 5px rgba(0, 230, 118, .13);
  flex: none;
  transition: box-shadow .25s var(--ease), transform .25s var(--ease);
}

.page-about .about-tl__item:hover .about-tl__node {
  box-shadow: 0 0 0 9px rgba(0, 230, 118, .18);
  transform: scale(1.12);
}

.page-about .about-tl__body {
  padding-top: 2px;
}

.page-about .about-tl__ver {
  font-size: 12px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .about-tl__title {
  font-family: var(--font-display);
  font-size: clamp(20px, 4.4vw, 28px);
  font-weight: 800;
  line-height: 1.25;
  margin: 8px 0 12px;
}

.page-about .about-tl__body p {
  color: #d5deea;
  margin: 0;
  max-width: 46em;
}

.page-about .about-tl__gain {
  margin-top: 14px !important;
  padding-left: 14px;
  border-left: 2px solid var(--green-dim);
  font-size: 14px;
  color: var(--green) !important;
  opacity: .78;
  transition: opacity .25s var(--ease);
}

.page-about .about-tl__item:hover .about-tl__gain {
  opacity: 1;
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: 48px;
}

.page-about .about-team__intro p {
  margin-top: 18px;
  color: #d5deea;
}

.page-about .about-team__media {
  margin: 36px 0 0;
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
}

.page-about .about-team__media .media__caption {
  margin-top: 12px;
  font-size: 13px;
  color: var(--slate);
}

.page-about .about-team__chart {
  display: grid;
  gap: 32px;
}

.page-about .about-team__ring {
  position: relative;
  width: min(280px, 74vw);
  margin: 0 auto;
  aspect-ratio: 1 / 1;
}

.page-about .about-ring {
  display: block;
  width: 100%;
  height: 100%;
}

.page-about .about-ring__arc {
  transition: opacity .25s var(--ease), stroke-width .25s var(--ease);
}

.page-about .about-team__ring:hover .about-ring__arc--a {
  stroke-width: 20;
}

.page-about .about-team__ring:hover .about-ring__arc--b {
  stroke-width: 20;
}

.page-about .about-team__ring:hover .about-ring__arc--c {
  stroke-width: 20;
}

.page-about .about-team__ring:hover .about-ring__arc--d {
  stroke-width: 20;
}

.page-about .about-ring__center {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  pointer-events: none;
}

.page-about .about-ring__total {
  font-size: clamp(40px, 12vw, 58px);
  font-weight: 900;
  line-height: 1;
  color: var(--green);
}

.page-about .about-ring__unit {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--slate);
}

.page-about .about-ring__legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--steel);
}

.page-about .about-ring__key {
  background: var(--ink-950);
  display: grid;
  grid-template-columns: 14px 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 14px 4px;
}

.page-about .about-ring__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex: none;
}

.page-about .about-ring__dot--a { background: var(--green); }
.page-about .about-ring__dot--b { background: var(--green-dim); }
.page-about .about-ring__dot--c { background: var(--orange); }
.page-about .about-ring__dot--d { background: var(--amber); }

.page-about .about-ring__label {
  font-size: 15px;
  color: #d5deea;
}

.page-about .about-ring__val {
  font-size: 20px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-ring__key:hover .about-ring__val {
  color: var(--green);
}

/* ---------- 生产流程 ---------- */
.page-about .about-flow .lede {
  color: var(--slate);
  max-width: 42em;
}

.page-about .about-flow__steps {
  margin-top: 48px;
  display: grid;
  gap: 1px;
  background: var(--steel);
}

.page-about .about-flow__step {
  background: var(--ink-950);
  padding: 32px 20px;
}

.page-about .about-flow__step--mid {
  background: var(--navy-900);
}

.page-about .about-flow__time {
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--amber);
}

.page-about .about-flow__name {
  font-family: var(--font-display);
  font-size: clamp(20px, 4.6vw, 26px);
  font-weight: 800;
  margin: 10px 0 14px;
}

.page-about .about-flow__step p {
  color: #d5deea;
  margin: 0;
}

.page-about .about-flow__list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-flow__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  color: var(--slate);
}

.page-about .about-flow__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 8px;
  height: 2px;
  background: var(--green);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco .lede {
  color: var(--slate);
  max-width: 42em;
}

.page-about .about-eco__grid {
  margin-top: 44px;
  display: grid;
  gap: 20px;
}

.page-about .about-eco__card {
  padding: 32px 24px 28px;
  transition: transform .25s var(--ease);
}

.page-about .about-eco__card:hover,
.page-about .about-eco__card:focus-visible {
  transform: translateY(-2px);
}

.page-about .about-eco__card:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 3px;
}

.page-about .about-eco__count {
  font-size: clamp(34px, 9vw, 46px);
  font-weight: 900;
  line-height: 1;
  color: var(--green);
}

.page-about .about-eco__name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  margin: 14px 0 12px;
}

.page-about .about-eco__desc {
  margin: 0;
  color: #d5deea;
  font-size: 15px;
}

.page-about .about-eco__more {
  margin: 14px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--green-dim);
  font-size: 14px;
  color: var(--green);
  opacity: 0;
  transform: translateY(5px);
  transition: opacity .25s var(--ease), transform .25s var(--ease);
}

.page-about .about-eco__card:hover .about-eco__more,
.page-about .about-eco__card:focus-within .about-eco__more,
.page-about .about-eco__card:focus-visible .about-eco__more {
  opacity: 1;
  transform: none;
}

@media (hover: none) {
  .page-about .about-eco__more {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 用户分布 ---------- */
.page-about .about-users__grid {
  display: grid;
  gap: 40px;
}

.page-about .about-users__text p {
  margin-top: 18px;
  color: #d5deea;
}

.page-about .about-users__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: 24px 18px;
  border-top: 1px solid var(--steel);
  padding-top: 24px;
}

.page-about .about-users__media {
  margin: 56px 0 0;
  position: relative;
}

.page-about .about-users__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5, 11, 22, 0) 40%, rgba(5, 11, 22, .92) 100%);
  pointer-events: none;
}

.page-about .about-users__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), calc(100% - 28px) 100%, 0 100%);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta__panel {
  padding: 36px 24px;
}

.page-about .about-cta__title {
  font-family: var(--font-display);
  font-size: clamp(24px, 5.6vw, 36px);
  font-weight: 900;
  margin: 0 0 14px;
  max-width: 16em;
}

.page-about .about-cta__text {
  margin: 0 0 28px;
  color: var(--slate);
  max-width: 34em;
}

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

.page-about .about-cta__actions .btn {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .about-crumbs {
    padding-top: 36px;
  }

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

  .page-about .about-flow__step {
    padding: 36px 24px;
  }

  .page-about .about-eco__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }

  .page-about .about-cta__panel {
    padding: 56px 48px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1024px) {
  .page-about .about-hero__grid {
    grid-template-columns: 5fr 7fr;
    gap: 56px;
    align-items: end;
  }

  .page-about .about-origin__grid {
    grid-template-columns: 5fr 7fr;
    gap: 64px;
    align-items: start;
  }

  .page-about .about-tl__item {
    grid-template-columns: 108px 1fr;
    gap: 0 32px;
    padding-bottom: 72px;
  }

  .page-about .about-tl__scale::after {
    top: 40px;
    bottom: -72px;
  }

  .page-about .about-team__grid {
    grid-template-columns: 7fr 5fr;
    gap: 72px;
    align-items: start;
  }

  .page-about .about-team__chart {
    position: sticky;
    top: 48px;
  }

  .page-about .about-team__media {
    margin-top: 44px;
  }

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

  .page-about .about-users__grid {
    grid-template-columns: 7fr 5fr;
    gap: 72px;
    align-items: start;
  }

  .page-about .about-users__media {
    margin-top: 72px;
  }

  .page-about .about-cta__panel {
    padding: 72px 64px;
  }
}

/* ---------- 降低动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl__node,
  .page-about .about-tl__gain,
  .page-about .about-eco__more,
  .page-about .about-eco__card,
  .page-about .about-ring__arc {
    transition: none;
  }
}