.page-about {
  --about-aside: 92px;
  display: block;
  overflow-x: hidden;
  color: var(--mist);
  background:
    radial-gradient(760px 480px at 84% -6%, rgba(43, 232, 165, .12), transparent 62%),
    radial-gradient(520px 420px at 2% 16%, rgba(78, 168, 255, .07), transparent 60%),
    var(--night);
}

.page-about .about-crumbs {
  padding-top: clamp(14px, 2.4vw, 26px);
  padding-bottom: 4px;
}

.page-about .crumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 2px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--cool);
}

.page-about .crumbs a {
  color: var(--cool);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-about .crumbs a:hover {
  color: var(--sig);
}

.page-about .crumbs__sep {
  margin: 0 .55em;
  color: var(--line);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 3.6vw, 40px) 0 clamp(30px, 5vw, 60px);
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-hero__title {
  margin: 10px 0 18px;
  max-width: 13em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 7.2vw, 76px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--mist);
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--sig);
}

.page-about .about-hero__lead {
  max-width: 62ch;
  margin: 0 0 24px;
  font-size: 17px;
  line-height: 1.85;
  color: var(--cool);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-hero__aside {
  display: none;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(26px, 4vw, 48px);
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-stat {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px 18px;
  background: var(--panel);
}

.page-about .about-stat__num {
  flex: none;
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--sig);
}

.page-about .about-stat__label {
  font-size: 14px;
  line-height: 1.6;
  color: var(--cool);
}

/* ---------- 起源 ---------- */

.page-about .about-origin {
  padding: clamp(38px, 6vw, 86px) 0 0;
}

.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 40px);
}

.page-about .about-origin__figure {
  margin: 0;
  aspect-ratio: 3 / 2;
  border: 1px solid var(--line);
}

.page-about .about-origin__text h2 {
  margin: 0 0 18px;
}

.page-about .media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.82) contrast(1.03);
}

/* ---------- 时间线 ---------- */

.page-about .about-arc {
  margin-top: clamp(38px, 6vw, 86px);
  padding: clamp(34px, 5.6vw, 76px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-arc__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--cool);
}

.page-about .about-timeline {
  position: relative;
  margin-top: clamp(22px, 3vw, 34px);
  padding-left: 34px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 16px;
  bottom: 16px;
  width: 1px;
  background: linear-gradient(180deg, var(--sig) 0%, var(--sig-deep) 26%, var(--line) 62%, var(--line) 100%);
}

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

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 22px;
  width: 13px;
  height: 13px;
  border: 1px solid var(--sig-deep);
  background: var(--night);
  transform: rotate(45deg);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .timeline__item:hover::before,
.page-about .timeline__item:has(.collapse__trigger[aria-expanded="true"])::before {
  background: var(--sig);
  border-color: var(--sig);
  box-shadow: 0 0 0 5px rgba(43, 232, 165, .14);
}

.page-about .timeline__trigger {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  width: 100%;
  padding: 18px 0;
  border: 0;
  background: transparent;
  color: var(--mist);
  font: inherit;
  text-align: left;
  cursor: pointer;
}

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

.page-about .timeline__stage {
  flex: none;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--sig);
}

.page-about .timeline__name {
  font-size: clamp(17px, 2.3vw, 23px);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.4;
}

.page-about .timeline__trigger .collapse__icon {
  margin-left: auto;
  flex: none;
}

.page-about .timeline__item .collapse__inner {
  padding: 0 0 20px;
  max-width: 72ch;
}

.page-about .timeline__item .collapse__inner p {
  margin: 0 0 1em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--cool);
}

.page-about .timeline__item .collapse__inner p:last-child {
  margin-bottom: 0;
}

/* ---------- 终端对照 ---------- */

.page-about .about-compare {
  padding: clamp(34px, 5.6vw, 76px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-compare h2 {
  margin: 0 0 12px;
}

.page-about .about-compare__lead {
  max-width: 60ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--cool);
}

.page-about .about-compare__stack {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-compare__card {
  padding: clamp(18px, 2.6vw, 28px);
  background: var(--panel);
}

.page-about .about-compare__card--new {
  border-color: var(--sig-deep);
  background:
    linear-gradient(180deg, rgba(43, 232, 165, .08), transparent 68%),
    var(--panel);
}

.page-about .about-compare__title {
  margin: 12px 0 0;
  font-size: clamp(19px, 2.4vw, 24px);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .about-order {
  list-style: none;
  display: grid;
  gap: 1px;
  margin: 16px 0 0;
  padding: 0;
  background: var(--line);
}

.page-about .about-order li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 14px;
  background: var(--track);
  font-size: 15px;
  line-height: 1.6;
}

.page-about .about-order .mono {
  flex: none;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--cool);
}

.page-about .about-compare__card--new .about-order li {
  background: rgba(43, 232, 165, .06);
}

.page-about .about-compare__card--new .about-order .mono {
  color: var(--sig);
}

.page-about .about-compare__note {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--cool);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  padding: clamp(34px, 5.6vw, 76px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 40px);
}

.page-about .about-team__text h2 {
  margin: 0 0 18px;
}

.page-about .about-team__figure {
  margin: 0;
  border: 1px solid var(--line);
}

.page-about .about-roles {
  list-style: none;
  display: grid;
  gap: 1px;
  margin: 24px 0 0;
  padding: 0;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-roles li {
  display: grid;
  gap: 7px;
  padding: 16px 18px;
  background: var(--panel);
}

.page-about .about-roles b {
  font-size: 17px;
  font-weight: 700;
  color: var(--mist);
}

.page-about .about-roles span {
  font-size: 15px;
  line-height: 1.8;
  color: var(--cool);
}

/* ---------- 合作生态 ---------- */

.page-about .about-eco {
  padding: clamp(34px, 5.6vw, 76px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-eco h2 {
  margin: 0 0 12px;
}

.page-about .about-eco__lead {
  max-width: 60ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--cool);
}

.page-about .about-eco__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-eco__block {
  padding: clamp(18px, 2.6vw, 26px);
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .about-eco__count {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(38px, 6vw, 54px);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--sig);
}

.page-about .about-eco__count--alt {
  color: var(--blue);
}

.page-about .about-eco__title {
  margin: 6px 0 0;
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 700;
}

.page-about .eco-dots {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin: 16px 0;
}

.page-about .eco-dot {
  display: block;
  width: 14px;
  height: 14px;
  border: 1px solid var(--sig-deep);
  background: rgba(43, 232, 165, .10);
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .eco-dot--alt {
  border-color: rgba(78, 168, 255, .55);
  background: rgba(78, 168, 255, .10);
}

.page-about .about-eco__block:hover .eco-dot {
  background: var(--sig);
}

.page-about .about-eco__block:hover .eco-dot--alt {
  background: var(--blue);
}

.page-about .about-eco__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--cool);
}

.page-about .about-eco__foot {
  max-width: 74ch;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--amber);
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 稳定版 ---------- */

.page-about .about-stable {
  padding: clamp(34px, 5.6vw, 76px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-stable__text h2 {
  margin: 0 0 18px;
}

.page-about .about-stable__figure {
  margin: clamp(22px, 3vw, 34px) 0 0;
  aspect-ratio: 12 / 7;
  border: 1px solid var(--line);
}

.page-about .about-stable__metrics {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 16px;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-stable__metrics > div {
  padding: 16px 18px;
  background: var(--track);
  font-size: 14px;
  line-height: 1.7;
  color: var(--cool);
}

.page-about .about-stable__metrics .mono {
  display: block;
  margin-bottom: 5px;
  font-size: clamp(20px, 2.6vw, 26px);
  letter-spacing: -0.02em;
  color: var(--mist);
}

/* ---------- 编辑原则 ---------- */

.page-about .about-principles {
  padding: clamp(34px, 5.6vw, 76px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-principles h2 {
  margin: 0 0 12px;
}

.page-about .about-principles__lead {
  max-width: 60ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--cool);
}

.page-about .about-principles__list {
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
}

.page-about .about-principles__list li {
  padding: clamp(18px, 2.6vw, 26px);
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .about-principle__num {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--sig);
}

.page-about .about-principles__list h3 {
  margin: 0 0 10px;
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .about-principles__list p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--cool);
}

/* ---------- 收尾 ---------- */

.page-about .about-next {
  padding: 0 0 clamp(46px, 7vw, 96px);
}

.page-about .about-next__inner {
  display: grid;
  gap: 14px;
  padding: clamp(24px, 3.4vw, 40px);
  background:
    linear-gradient(120deg, rgba(43, 232, 165, .10), transparent 58%),
    var(--panel);
}

.page-about .about-next h2 {
  margin: 0;
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 6px;
}

.page-about .about-next__links a {
  padding: 10px 16px;
  border: 1px solid var(--line);
  color: var(--mist);
  font-size: 15px;
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-next__links a:hover {
  border-color: var(--sig-deep);
  background: rgba(43, 232, 165, .08);
  color: var(--sig);
}

/* ---------- 响应式 ---------- */

@media (min-width: 620px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

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

  .page-about .about-origin__figure {
    margin-top: 58px;
  }

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

  .page-about .about-compare__card--new {
    margin-top: -18px;
    margin-left: 18px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

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

  .page-about .about-principles__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1px;
    border: 1px solid var(--line);
    background: var(--line);
  }

  .page-about .about-principles__list li {
    border: 0;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) var(--about-aside);
    gap: 24px;
  }

  .page-about .about-hero__aside {
    display: flex;
    justify-content: flex-end;
    align-items: flex-start;
    padding-top: 64px;
  }

  .page-about .about-timeline {
    padding-left: 46px;
  }

  .page-about .about-timeline::before {
    left: 9px;
  }

  .page-about .timeline__item::before {
    left: -46px;
    margin-left: 3px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline__item::before,
  .page-about .eco-dot,
  .page-about .about-next__links a,
  .page-about .crumbs a {
    transition: none;
  }
}