.page-about {
  background: var(--paper);
  color: var(--ink);
  overflow-x: clip;
}

.page-about h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.55rem, 3.2vw, 2.35rem);
  line-height: 1.24;
  letter-spacing: -0.015em;
  margin: 0.4rem 0 1rem;
}

.page-about h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  line-height: 1.35;
  margin: 0 0 0.5rem;
}

.page-about p {
  line-height: 1.78;
  margin: 0 0 1rem;
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cyan-ink);
  margin: 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background: var(--ink);
  color: var(--paper);
  padding: clamp(1.5rem, 4vw, 2.5rem) 0 clamp(4.5rem, 11vw, 8rem);
  clip-path: polygon(0 0, 100% 0, 100% 93%, 0 100%);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -14%;
  bottom: -32%;
  width: 52%;
  aspect-ratio: 1;
  border: 1px solid rgba(23, 224, 206, 0.32);
  transform: rotate(16deg);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__crumb .breadcrumb__link {
  color: rgba(251, 252, 255, 0.66);
}

.page-about .about-hero__crumb .breadcrumb__link:hover,
.page-about .about-hero__crumb .breadcrumb__link:focus-visible {
  color: var(--cyan);
}

.page-about .about-hero__crumb .breadcrumb__current {
  color: var(--paper);
}

.page-about .about-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  margin-top: clamp(1.75rem, 5vw, 3rem);
  color: var(--cyan);
}

.page-about .about-hero__title {
  color: var(--paper);
  max-width: 15ch;
  margin: 0.85rem 0 1.15rem;
  line-height: 1.06;
}

.page-about .about-hero__lead {
  max-width: 56ch;
  color: rgba(251, 252, 255, 0.82);
  font-size: clamp(1rem, 1.5vw, 1.12rem);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.page-about .about-index {
  margin-top: clamp(2.5rem, 6vw, 4rem);
  border-top: 1px solid rgba(201, 210, 240, 0.2);
  padding-top: 1.1rem;
}

.page-about .about-index__label {
  color: rgba(251, 252, 255, 0.45);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
}

.page-about .about-index__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem 1.6rem;
  list-style: none;
  margin: 0.8rem 0 0;
  padding: 0;
}

.page-about .about-index__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  font-size: 0.9rem;
  color: rgba(251, 252, 255, 0.74);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .about-index__list a .mono {
  color: var(--cyan);
  font-size: 0.75rem;
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--cyan);
}

/* ---------- 起源 ---------- */
.page-about .about-origin {
  padding: clamp(3rem, 9vw, 6rem) 0 clamp(2.5rem, 7vw, 5rem);
}

.page-about .about-origin__grid {
  display: grid;
  gap: clamp(1.25rem, 4vw, 3rem);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-origin__year {
  display: block;
  margin: 0.4rem 0 0;
  font-size: clamp(4.5rem, 21vw, 13rem);
  line-height: 0.8;
  letter-spacing: -0.05em;
  color: var(--line);
}

.page-about .about-origin__text h2 {
  max-width: 22ch;
}

.page-about .about-origin__text p {
  max-width: 62ch;
  color: var(--ink);
}

.page-about .about-origin__text p:last-child {
  color: var(--cyan-ink);
  font-weight: 600;
}

/* ---------- 团队分工 ---------- */
.page-about .about-team {
  padding: clamp(2.5rem, 7vw, 5rem) 0 clamp(3rem, 8vw, 6rem);
  border-top: 1px solid var(--line);
}

.page-about .about-team__head h2 {
  max-width: 24ch;
}

.page-about .about-team__lead {
  max-width: 58ch;
  color: var(--muted);
}

.page-about .about-team__grid {
  display: grid;
  gap: 1.15rem;
  grid-template-columns: minmax(0, 1fr);
  margin-top: clamp(1.75rem, 5vw, 3rem);
}

.page-about .flip-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 3px;
  box-shadow: var(--shadow-card);
  outline: none;
  transition: border-color 240ms var(--ease), transform 240ms var(--ease), box-shadow 240ms var(--ease);
}

.page-about .flip-card:hover,
.page-about .flip-card:focus-visible {
  border-color: var(--cyan);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lift);
}

.page-about .flip-card:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .flip-card__face--front {
  padding: clamp(1.25rem, 3vw, 1.7rem) clamp(1.25rem, 3vw, 1.7rem) clamp(1.1rem, 2.6vw, 1.4rem);
}

.page-about .flip-card__num {
  display: inline-block;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--coral);
  background: var(--coral-soft);
  border-radius: 2px;
  padding: 0.18rem 0.45rem;
  margin-bottom: 0.9rem;
}

.page-about .flip-card__line {
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 0;
}

.page-about .flip-card__hint {
  display: none;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--cyan-ink);
  margin-top: 0.9rem;
}

.page-about .flip-card__face--back {
  border-top: 1px solid var(--line);
  background: var(--mist);
  padding: clamp(1rem, 2.6vw, 1.4rem) clamp(1.25rem, 3vw, 1.7rem) clamp(1.3rem, 3vw, 1.6rem);
}

.page-about .flip-card__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .flip-card__list li {
  position: relative;
  padding-left: 1.1rem;
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 0.55rem;
}

.page-about .flip-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 2px;
  background: var(--cyan-ink);
}

/* ---------- 图文带 ---------- */
.page-about .about-figure-band {
  padding: clamp(1.5rem, 5vw, 3rem) 0 clamp(2.5rem, 7vw, 4.5rem);
}

.page-about .about-figure {
  margin: 0 auto;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: 3px;
  border: 1px solid var(--line);
}

.page-about .about-figure figcaption {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.03em;
  color: var(--muted);
  margin-top: 0.85rem;
}

.page-about .about-quote {
  margin: clamp(1.75rem, 5vw, 3rem) auto 0;
  border-left: 4px solid var(--cyan);
  padding-left: clamp(1rem, 3vw, 1.6rem);
}

.page-about .about-quote p {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.15rem, 2.4vw, 1.5rem);
  line-height: 1.5;
  color: var(--ink);
  margin: 0;
}

/* ---------- 真机测试 ---------- */
.page-about .about-lab {
  background: var(--mist);
  padding: clamp(3rem, 8vw, 6rem) 0;
}

.page-about .about-lab__grid {
  display: grid;
  gap: clamp(1.75rem, 5vw, 3.5rem);
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
}

.page-about .about-lab__text h2 {
  max-width: 20ch;
}

.page-about .about-lab__text p {
  max-width: 58ch;
}

.page-about .about-lab__list {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-lab__list li {
  display: flex;
  gap: 0.85rem;
  align-items: baseline;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.95rem;
  line-height: 1.65;
}

.page-about .about-lab__list .mono {
  flex: 0 0 auto;
  font-size: 0.78rem;
  color: var(--coral);
}

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

.page-about .about-lab__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  border-radius: 3px;
}

.page-about .about-lab__media .media-frame__caption {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted);
  margin-top: 0.75rem;
}

.page-about .about-lab__matrix {
  margin-top: clamp(2rem, 5vw, 3.25rem);
}

.page-about .device-grid {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 6px;
}

.page-about .device-grid i {
  display: block;
  aspect-ratio: 3 / 5;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--paper);
  transition: border-color 200ms var(--ease), background 200ms var(--ease);
}

.page-about .device-grid i:hover {
  border-color: var(--cyan);
  background: #F1FCFB;
}

.page-about .device-grid i.is-marked {
  border-color: var(--cyan-ink);
  background: rgba(23, 224, 206, 0.18);
}

.page-about .about-lab__matrix-note {
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin: 0.85rem 0 0;
}

/* ---------- 校对关卡 ---------- */
.page-about .about-review {
  padding: clamp(3rem, 8vw, 6rem) 0;
}

.page-about .about-review__head h2 {
  max-width: 20ch;
}

.page-about .about-review__lead {
  max-width: 58ch;
  color: var(--muted);
}

.page-about .review-steps {
  display: grid;
  gap: 1rem;
  grid-template-columns: minmax(0, 1fr);
  list-style: none;
  margin: clamp(1.75rem, 5vw, 3rem) 0 0;
  padding: 0;
  counter-reset: review;
}

.page-about .review-step {
  position: relative;
  background: var(--paper);
  border: 1px solid var(--line);
  border-top: 3px solid var(--cyan);
  border-radius: 3px;
  padding: clamp(1.15rem, 3vw, 1.6rem);
  box-shadow: var(--shadow-card);
  transition: border-color 220ms var(--ease), box-shadow 220ms var(--ease);
}

.page-about .review-step:hover,
.page-about .review-step:focus-within {
  border-color: var(--cyan);
  box-shadow: var(--shadow-lift);
}

.page-about .review-step__num {
  display: inline-block;
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  color: var(--cyan-ink);
  margin-bottom: 0.6rem;
}

.page-about .review-step__title {
  margin-bottom: 0.45rem;
}

.page-about .review-step__desc {
  color: var(--muted);
  font-size: 0.92rem;
  margin-bottom: 0;
}

.page-about .review-step__checks ul {
  list-style: none;
  margin: 0.85rem 0 0;
  padding: 0.85rem 0 0;
  border-top: 1px dashed var(--line);
}

.page-about .review-step__checks li {
  position: relative;
  padding-left: 1rem;
  font-size: 0.88rem;
  line-height: 1.65;
  margin-bottom: 0.45rem;
  color: var(--ink);
}

.page-about .review-step__checks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.66em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--coral);
}

/* ---------- 改版历程 ---------- */
.page-about .about-revisions {
  position: relative;
  background: var(--ink);
  color: var(--paper);
  padding: clamp(3rem, 8vw, 6rem) 0;
  overflow: hidden;
}

.page-about .about-revisions__bg {
  position: absolute;
  inset: 0;
  opacity: 0.16;
  pointer-events: none;
}

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

.page-about .about-revisions > .container {
  position: relative;
  z-index: 1;
}

.page-about .about-revisions__head .eyebrow {
  color: var(--cyan);
}

.page-about .about-revisions__head h2 {
  color: var(--paper);
  max-width: 20ch;
}

.page-about .about-revisions__lead {
  max-width: 56ch;
  color: rgba(251, 252, 255, 0.78);
}

.page-about .timeline {
  margin-top: clamp(1.75rem, 5vw, 3rem);
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.5rem 0 1.1rem;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  scrollbar-color: rgba(23, 224, 206, 0.5) transparent;
}

.page-about .timeline:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 6px;
}

.page-about .timeline__track {
  position: relative;
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  width: max-content;
}

.page-about .timeline__track::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 5px;
  height: 1px;
  background: rgba(23, 224, 206, 0.4);
}

.page-about .timeline__node {
  position: relative;
  flex: 0 0 clamp(180px, 24vw, 240px);
  padding: 2.4rem 1.4rem 0 0;
  scroll-snap-align: start;
}

.page-about .timeline__node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(23, 224, 206, 0.16);
}

.page-about .timeline__ver {
  display: block;
  font-size: clamp(1.35rem, 2.6vw, 1.8rem);
  color: var(--cyan);
  letter-spacing: 0.02em;
  margin-bottom: 0.55rem;
}

.page-about .timeline__name {
  color: var(--paper);
  font-size: 1.05rem;
  margin-bottom: 0.4rem;
}

.page-about .timeline__desc {
  font-size: 0.88rem;
  line-height: 1.68;
  color: rgba(251, 252, 255, 0.7);
  margin: 0;
}

.page-about .about-revisions__hint {
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: rgba(251, 252, 255, 0.5);
  margin: 0.5rem 0 0;
}

/* ---------- 合作方 ---------- */
.page-about .about-partners {
  padding: clamp(3rem, 8vw, 6rem) 0;
}

.page-about .about-partners__grid {
  display: grid;
  gap: clamp(1.75rem, 5vw, 3.5rem);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-partners__intro h2 {
  max-width: 18ch;
}

.page-about .about-partners__intro p {
  max-width: 46ch;
  color: var(--muted);
}

.page-about .partner-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .partner-list__row {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.93rem;
}

.page-about .partner-list__num {
  flex: 0 0 auto;
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  color: var(--cyan-ink);
}

.page-about .partner-list__name {
  color: var(--ink);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding: 0 0 clamp(3rem, 8vw, 6rem);
}

.page-about .about-next__panel {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  grid-template-columns: minmax(0, 1fr);
  background: var(--ink);
  color: var(--paper);
  border-radius: 3px;
  padding: clamp(1.5rem, 4vw, 2.75rem);
}

.page-about .about-next__text .eyebrow {
  color: var(--cyan);
}

.page-about .about-next__text h2 {
  color: var(--paper);
  margin-bottom: 0.6rem;
}

.page-about .about-next__text p {
  color: rgba(251, 252, 255, 0.72);
  margin: 0;
  max-width: 34ch;
}

.page-about .about-next__links {
  display: grid;
  gap: 0.6rem;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-next__link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "num title"
    "num desc";
  column-gap: 0.85rem;
  row-gap: 0.15rem;
  align-items: baseline;
  padding: 0.85rem 1rem;
  border: 1px solid rgba(201, 210, 240, 0.24);
  border-radius: 3px;
  text-decoration: none;
  color: var(--paper);
  transition: border-color 220ms var(--ease), background 220ms var(--ease), transform 220ms var(--ease);
}

.page-about .about-next__link .mono {
  grid-area: num;
  font-size: 0.76rem;
  color: var(--cyan);
}

.page-about .about-next__link strong {
  grid-area: title;
  font-size: 0.98rem;
  font-weight: 700;
}

.page-about .about-next__link span:last-child {
  grid-area: desc;
  font-size: 0.8rem;
  color: rgba(251, 252, 255, 0.62);
  line-height: 1.55;
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-color: var(--cyan);
  background: rgba(23, 224, 206, 0.08);
  transform: translateY(-2px);
}

.page-about a:focus-visible,
.page-about .flip-card:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-next__links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: end;
  }

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

  .page-about .flip-card:nth-child(2) {
    margin-top: 2rem;
  }

  .page-about .flip-card:nth-child(3) {
    margin-top: 4rem;
  }

  .page-about .about-lab__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
  }

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

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: start;
  }

  .page-about .about-next__panel {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    align-items: center;
  }
}

@media (hover: hover) and (min-width: 900px) {
  .page-about .flip-card {
    perspective: 1400px;
  }

  .page-about .flip-card__inner {
    position: relative;
    height: 21rem;
    transform-style: preserve-3d;
    transition: transform 480ms var(--ease);
  }

  .page-about .flip-card:hover .flip-card__inner,
  .page-about .flip-card:focus .flip-card__inner {
    transform: rotateY(180deg);
  }

  .page-about .flip-card__face {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    overflow-y: auto;
  }

  .page-about .flip-card__face--front {
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  .page-about .flip-card__hint {
    display: block;
  }

  .page-about .flip-card__face--back {
    border-top: 0;
    transform: rotateY(180deg);
    background: var(--indigo-700);
    color: var(--paper);
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  .page-about .flip-card__face--back .flip-card__title {
    color: var(--paper);
  }

  .page-about .flip-card__face--back .flip-card__list li {
    color: rgba(251, 252, 255, 0.86);
  }

  .page-about .flip-card__face--back .flip-card__list li::before {
    background: var(--cyan);
  }

  .page-about .review-step__checks {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 320ms var(--ease), opacity 240ms var(--ease);
  }

  .page-about .review-step:hover .review-step__checks,
  .page-about .review-step:focus-within .review-step__checks {
    max-height: 18rem;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .flip-card,
  .page-about .flip-card__inner,
  .page-about .review-step,
  .page-about .review-step__checks,
  .page-about .about-next__link {
    transition-duration: 1ms;
  }

  .page-about .flip-card:hover,
  .page-about .about-next__link:hover {
    transform: none;
  }

  .page-about .flip-card:hover .flip-card__inner,
  .page-about .flip-card:focus .flip-card__inner {
    transform: rotateY(180deg);
    transition-duration: 1ms;
  }
}
<<<</PAGE_CSS>>>