.page-about {
  --about-line: 1px;
  --about-flow: clamp(1.25rem, 3.5vw, 2rem);
  counter-reset: about-plate;
}

/* ---------- 首屏拼贴 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(1.75rem, 5vw, 3rem) clamp(2.25rem, 6vw, 4rem);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(58% 88% at 8% 0%, rgba(139, 92, 246, .26), transparent 68%),
    radial-gradient(52% 80% at 92% 8%, rgba(0, 229, 212, .2), transparent 66%);
}

.page-about .about-hero > .wrap {
  position: relative;
  z-index: 1;
}

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

.page-about .about-hero__title {
  margin: .55rem 0 1rem;
  font-size: clamp(2rem, 8.5vw, 3.9rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -.025em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  max-width: 48ch;
  color: var(--paper);
  opacity: .84;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: 1.7rem;
}

.page-about .about-hero__aside {
  display: grid;
  gap: 1rem;
  align-content: start;
}

.page-about .about-hero__plaque {
  padding: 1.25rem 1.35rem 1.35rem;
  border-radius: var(--radius);
}

.page-about .about-hero__year {
  margin: .3rem 0 .5rem;
  font-family: var(--font-mono);
  font-size: clamp(2.1rem, 8vw, 2.9rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--ink);
}

.page-about .about-hero__plaque-text {
  margin: 0;
  font-size: .9rem;
  line-height: 1.8;
  color: rgba(7, 7, 12, .78);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__fact {
  display: grid;
  gap: .3rem;
  align-content: start;
  padding: .85rem .6rem .8rem;
  border: 1px solid var(--track);
  border-radius: var(--radius-s);
  background: var(--panel);
}

.page-about .about-hero__fact-num {
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 5.5vw, 1.7rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-hero__fact-label {
  font-size: .72rem;
  line-height: 1.55;
  color: var(--signal);
}

/* ---------- 时间脉络 ---------- */
.page-about .about-timeline__fig {
  margin: 2.25rem 0 0;
}

.page-about .about-track__list {
  margin: 1.9rem 0 0;
  padding: 0;
  list-style: none;
  border-bottom: var(--about-line) solid var(--track);
}

.page-about .about-track__item {
  display: grid;
  grid-template-columns: 3.9rem minmax(0, 1fr);
  gap: 0 .9rem;
  padding: 1.3rem .2rem;
  border-top: var(--about-line) solid var(--track);
  border-radius: var(--radius-s);
  outline: none;
  transition: background .32s var(--ease), transform .32s var(--ease);
}

.page-about .about-track__item:hover,
.page-about .about-track__item:focus-visible {
  background: linear-gradient(90deg, rgba(0, 229, 212, .09), rgba(139, 92, 246, .07) 58%, transparent);
}

.page-about .about-track__item:focus-visible {
  box-shadow: 0 0 0 2px var(--cyan);
}

.page-about .about-track__stamp {
  display: flex;
  flex-direction: column;
  gap: .4rem;
  font-family: var(--font-mono);
}

.page-about .about-track__idx {
  font-size: .78rem;
  letter-spacing: .12em;
  color: var(--violet);
}

.page-about .about-track__tag {
  font-size: .74rem;
  letter-spacing: .1em;
  color: var(--signal);
}

.page-about .about-track__title {
  margin: 0 0 .45rem;
  font-size: 1.12rem;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .about-track__text {
  margin: 0;
  font-size: .94rem;
  line-height: 1.88;
  color: var(--signal);
}

.page-about .about-track__note {
  margin: .7rem 0 0;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .04em;
  color: var(--signal);
  opacity: .55;
  transform: translateX(-4px);
  transition: color .32s var(--ease), opacity .32s var(--ease), transform .32s var(--ease);
}

.page-about .about-track__item:hover .about-track__note,
.page-about .about-track__item:focus-visible .about-track__note {
  color: var(--cyan);
  opacity: 1;
  transform: translateX(0);
}

/* ---------- 团队展签 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.1rem;
  margin-top: 1.9rem;
}

.page-about .about-plate {
  position: relative;
  display: grid;
  gap: .55rem;
  align-content: start;
  padding: 1.5rem 1.35rem 1.4rem;
  background: var(--warm);
  border-radius: var(--radius);
  outline: none;
  transition: transform .32s var(--ease), box-shadow .32s var(--ease);
}

.page-about .about-plate::before {
  content: "";
  position: absolute;
  top: 0;
  left: 1.35rem;
  width: 2.6rem;
  height: 3px;
  border-radius: 0 0 3px 3px;
  background: var(--pulse);
}

.page-about .about-plate:hover,
.page-about .about-plate:focus-visible {
  transform: translateY(-4px);
  box-shadow: 0 16px 34px rgba(0, 0, 0, .5);
}

.page-about .about-plate:focus-visible {
  box-shadow: 0 0 0 2px var(--ink), 0 16px 34px rgba(0, 0, 0, .5);
}

.page-about .about-plate__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .73rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: rgba(7, 7, 12, .5);
}

.page-about .about-plate__num {
  margin: .1rem 0 .25rem;
  font-family: var(--font-mono);
  font-size: clamp(2.15rem, 8vw, 2.9rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--ink);
}

.page-about .about-plate__num span {
  margin-left: .3rem;
  font-family: var(--font-sans);
  font-size: .92rem;
  font-weight: 500;
  letter-spacing: 0;
  color: rgba(7, 7, 12, .66);
}

.page-about .about-plate__text {
  margin: 0;
  font-size: .91rem;
  line-height: 1.82;
  color: rgba(7, 7, 12, .78);
}

.page-about .about-plate__keys {
  margin: .35rem 0 0;
  padding-top: .65rem;
  border-top: 1px solid rgba(7, 7, 12, .15);
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .04em;
  color: rgba(7, 7, 12, .52);
}

/* ---------- 内容体系 ---------- */
.page-about .about-library__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.8rem;
  align-items: center;
}

.page-about .about-library__text p {
  max-width: 52ch;
}

.page-about .about-library__keys {
  margin: 1.4rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: .6rem;
}

.page-about .about-library__keys li {
  position: relative;
  padding-left: 1.35rem;
  font-size: .9rem;
  line-height: 1.7;
  color: var(--paper);
  opacity: .86;
}

.page-about .about-library__keys li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: .5rem;
  height: .5rem;
  border-radius: 50%;
  background: var(--pulse);
}

.page-about .about-library__link {
  display: inline-block;
  margin-top: 1.5rem;
  padding-bottom: .2rem;
  border-bottom: 1px solid rgba(0, 229, 212, .5);
  color: var(--cyan);
  font-weight: 500;
  text-decoration: none;
  transition: border-color .32s var(--ease), color .32s var(--ease);
}

.page-about .about-library__link:hover,
.page-about .about-library__link:focus-visible {
  color: var(--paper);
  border-color: var(--paper);
}

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

/* ---------- 合作生态 ---------- */
.page-about .about-partners__fig {
  margin: 1.9rem 0 0;
}

.page-about .about-partners__list {
  display: flex;
  gap: 1rem;
  margin: 1.6rem 0 0;
  padding: 0 0 .85rem;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-partners__item {
  flex: 0 0 78%;
  min-width: 15rem;
  scroll-snap-align: start;
  padding: 1.25rem 1.2rem 1.35rem;
  border: 1px solid var(--track);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(16, 16, 25, .96), rgba(27, 31, 59, .82));
  transition: transform .32s var(--ease), border-color .32s var(--ease);
}

.page-about .about-partners__item:hover {
  transform: translateY(-4px);
  border-color: var(--cyan);
}

.page-about .about-partners__idx {
  display: block;
  margin-bottom: .55rem;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .14em;
  color: var(--alert);
}

.page-about .about-partners__title {
  margin: 0 0 .5rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-partners__text {
  margin: 0;
  font-size: .88rem;
  line-height: 1.82;
  color: var(--signal);
}

/* ---------- 主体信息 ---------- */
.page-about .about-region__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.6rem;
  padding: clamp(1.4rem, 5vw, 2.5rem);
  border: 1px solid var(--track);
  border-radius: var(--radius);
  background: linear-gradient(152deg, rgba(27, 31, 59, .95), rgba(16, 16, 25, .96));
}

.page-about .about-region__text p {
  max-width: 50ch;
}

.page-about .about-region__link {
  display: inline-block;
  margin-top: 1.2rem;
  padding-bottom: .2rem;
  border-bottom: 1px solid rgba(0, 229, 212, .5);
  color: var(--cyan);
  font-weight: 500;
  text-decoration: none;
  transition: color .32s var(--ease), border-color .32s var(--ease);
}

.page-about .about-region__link:hover,
.page-about .about-region__link:focus-visible {
  color: var(--paper);
  border-color: var(--paper);
}

.page-about .about-region__icp-box {
  align-self: start;
  padding: 1.25rem 1.2rem;
  border: 1px dashed rgba(0, 229, 212, .45);
  border-radius: var(--radius-s);
  background: rgba(7, 7, 12, .55);
}

.page-about .about-region__icp-label {
  margin: 0 0 .7rem;
  font-family: var(--font-mono);
  font-size: .73rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--signal);
}

.page-about .about-region__icp {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1rem, 4vw, 1.2rem);
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--cyan);
  word-break: break-all;
}

.page-about .about-region__icp-note {
  margin: .8rem 0 0;
  font-size: .82rem;
  line-height: 1.75;
  color: var(--signal);
}

/* ---------- 服务保障 ---------- */
.page-about .about-assurance__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .85rem;
  margin-top: 1.7rem;
}

.page-about .about-assurance__stat {
  display: grid;
  gap: .45rem;
  align-content: start;
  padding: 1.1rem .95rem 1.15rem;
  border-left: 2px solid var(--violet);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  background: rgba(16, 16, 25, .8);
  transition: border-color .32s var(--ease), background .32s var(--ease);
}

.page-about .about-assurance__stat:hover {
  border-color: var(--cyan);
  background: rgba(16, 16, 25, 1);
}

.page-about .about-assurance__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 6vw, 2rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--paper);
}

.page-about .about-assurance__num em {
  font-style: normal;
  margin-left: .18rem;
  font-family: var(--font-sans);
  font-size: .82rem;
  font-weight: 500;
  letter-spacing: 0;
  color: var(--cyan);
}

.page-about .about-assurance__cap {
  margin: 0;
  font-size: .82rem;
  line-height: 1.7;
  color: var(--signal);
}

.page-about .about-assurance__cta {
  margin-top: 1.9rem;
  padding: clamp(1.25rem, 4.5vw, 1.9rem);
  border-radius: var(--radius);
  border: 1px solid var(--track);
  background: linear-gradient(120deg, rgba(0, 229, 212, .07), rgba(139, 92, 246, .1));
}

.page-about .about-assurance__cta p {
  margin: 0 0 1.1rem;
  max-width: 46ch;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--paper);
}

.page-about .about-assurance__btns {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
}

/* ---------- 斜向过渡 ---------- */
.page-about .about-partners {
  position: relative;
}

.page-about .about-partners::before {
  content: "";
  position: absolute;
  left: -5%;
  right: -5%;
  top: 0;
  height: 3.5rem;
  background: linear-gradient(120deg, rgba(139, 92, 246, .12), transparent 72%);
  transform: skewY(-3deg);
  transform-origin: left top;
  pointer-events: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-partners__item {
    flex: 0 0 46%;
  }

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

@media (min-width: 880px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(270px, .85fr);
    gap: clamp(2rem, 5vw, 3.5rem);
    align-items: start;
  }

  .page-about .about-track__list {
    margin-top: 2.4rem;
  }

  .page-about .about-track__item {
    grid-template-columns: 5.4rem minmax(0, 1fr);
    gap: 0 2rem;
    padding: 1.7rem .6rem;
  }

  .page-about .about-track__item {
    transform: translateX(0);
  }

  .page-about .about-track__item:hover,
  .page-about .about-track__item:focus-visible {
    transform: translateX(5px);
  }

  .page-about .about-track__stamp {
    padding-right: 1rem;
    border-right: 1px solid var(--track);
  }

  .page-about .about-team__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.2rem;
  }

  .page-about .about-library__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: clamp(2rem, 5vw, 3.25rem);
  }

  .page-about .about-region__inner {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr);
    gap: 2.5rem;
  }

  .page-about .about-assurance__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-assurance__cta {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 1.5rem;
    align-items: center;
  }

  .page-about .about-assurance__cta p {
    margin-bottom: 0;
  }

  .page-about .about-partners__item {
    flex: 0 0 30%;
    min-width: 17rem;
  }
}

@media (min-width: 1080px) {
  .page-about .about-hero__title {
    max-width: 18ch;
  }

  .page-about .about-track__item {
    grid-template-columns: 6.5rem minmax(0, 1fr);
    gap: 0 2.75rem;
  }

  .page-about .about-partners__item {
    flex: 0 0 23.5%;
    min-width: 16rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-track__item,
  .page-about .about-track__note,
  .page-about .about-plate,
  .page-about .about-partners__item,
  .page-about .about-assurance__stat {
    transition: none;
  }

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