.page-about {
  --about-gap: clamp(1.5rem, 4vw, 3rem);
  --about-rule: 1px dashed var(--line);
  display: block;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding-top: clamp(1rem, 3vw, 1.6rem);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.75rem, 5vw, 4rem) 0 clamp(1.75rem, 5vw, 3rem);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% -12% auto -12%;
  height: 150%;
  pointer-events: none;
  background:
    radial-gradient(58% 52% at 10% 2%, rgba(47, 230, 224, 0.17), transparent 70%),
    radial-gradient(52% 48% at 90% 6%, rgba(255, 122, 47, 0.13), transparent 72%);
}

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

.page-about .about-hero__eyebrow {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0.65rem 0 0;
  max-width: 17ch;
  font-size: clamp(1.95rem, 7vw, 4rem);
  line-height: 1.06;
  font-weight: 800;
  letter-spacing: -0.028em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin-top: 1.1rem;
  max-width: 62ch;
}

/* 首屏数据条 */
.page-about .about-figures {
  list-style: none;
  margin: clamp(1.75rem, 5vw, 2.75rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-figures__item {
  background: var(--ink);
  padding: 0.95rem 1rem 1.05rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  min-width: 0;
}

.page-about .about-figures__num {
  font-size: clamp(1.35rem, 4.4vw, 1.95rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--cyan);
  line-height: 1.1;
}

.page-about .about-figures__cap {
  font-size: 0.8rem;
  line-height: 1.55;
  color: var(--mist);
}

@media (min-width: 760px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  position: relative;
  padding: clamp(2.25rem, 6vw, 4.5rem) 0;
}

.page-about .about-chapter + .about-chapter::before {
  content: "";
  position: absolute;
  top: 0;
  left: clamp(1rem, 5vw, 4rem);
  right: clamp(1rem, 5vw, 4rem);
  height: 1px;
  background: var(--line);
  transform: rotate(-0.4deg);
  transform-origin: left center;
}

.page-about .about-chapter--scenes {
  background: linear-gradient(180deg, var(--hull) 0%, var(--ink) 78%);
}

.page-about .about-figure {
  margin: 0 0 clamp(1.25rem, 3.5vw, 2rem);
}

.page-about .prose {
  max-width: 68ch;
}

/* ---------- 时间轴 ---------- */
.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

@media (min-width: 780px) {
  .page-about .tl {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    align-items: start;
    gap: 0.9rem;
  }
}

.page-about .tl__node {
  position: relative;
  height: 100%;
  border: 1px solid var(--line);
  background: linear-gradient(158deg, var(--hull) 0%, var(--ink) 100%);
  padding: 1.05rem 1rem 1rem;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .tl__node::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 44px;
  height: 2px;
  background: var(--cyan);
}

.page-about .tl__node[open] {
  border-color: rgba(47, 230, 224, 0.5);
}

.page-about .tl__summary {
  position: relative;
  cursor: pointer;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding-right: 1.5rem;
  outline-offset: 4px;
}

.page-about .tl__summary::-webkit-details-marker {
  display: none;
}

.page-about .tl__summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 5px;
}

.page-about .tl__summary::after {
  content: "＋";
  position: absolute;
  top: 0.1rem;
  right: 0;
  font-size: 0.85rem;
  color: var(--mist);
}

.page-about .tl__node[open] .tl__summary::after {
  content: "－";
  color: var(--cyan);
}

.page-about .tl__year {
  font-size: clamp(1.3rem, 3.4vw, 1.7rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--cyan);
  line-height: 1.1;
}

.page-about .tl__label {
  font-size: 0.9rem;
  letter-spacing: 0.03em;
  color: var(--paper);
}

.page-about .tl__body {
  margin-top: 0.85rem;
  padding-top: 0.85rem;
  border-top: var(--about-rule);
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--mist);
}

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

/* ---------- 使用场景 ---------- */
.page-about .scenes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

@media (min-width: 900px) {
  .page-about .scenes {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: start;
  }
}

.page-about .scenes__lead p + p {
  margin-top: 1.15em;
}

.page-about .scenes__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-left: 2px solid var(--orange);
}

.page-about .scenes__item {
  background: var(--ink);
  padding: 1rem 1.1rem 1.1rem;
}

.page-about .scenes__idx {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .scenes__h {
  margin: 0.35rem 0 0.4rem;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--paper);
  letter-spacing: -0.01em;
}

.page-about .scenes__p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .usage-stats {
  list-style: none;
  margin: clamp(1.75rem, 5vw, 2.5rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 780px) {
  .page-about .usage-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .usage-stats__item {
  background: var(--hull);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  min-width: 0;
}

.page-about .usage-stats__num {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--pulse);
  letter-spacing: 0.01em;
}

.page-about .usage-stats__cap {
  font-size: 0.78rem;
  line-height: 1.55;
  color: var(--mist);
}

/* ---------- 跨端同步 ---------- */
.page-about .syncgrid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

@media (min-width: 960px) {
  .page-about .syncgrid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }
}

.page-about .syncgrid__side {
  min-width: 0;
}

.page-about .sync-card {
  padding: 1.1rem 1.15rem 1.2rem;
}

.page-about .sync-card__title {
  margin: 0 0 0.35rem;
  font-size: 0.74rem;
  letter-spacing: 0.18em;
  color: var(--mist);
}

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

.page-about .sync-card__row {
  display: grid;
  grid-template-columns: 16px minmax(0, 1fr);
  gap: 0.2rem 0.7rem;
  padding: 0.7rem 0;
  border-top: var(--about-rule);
}

.page-about .sync-card__row:first-child {
  border-top: 0;
}

.page-about .sync-card__row .led {
  margin-top: 0.35rem;
}

.page-about .sync-card__name {
  font-size: 0.94rem;
  color: var(--paper);
  letter-spacing: 0.02em;
}

.page-about .sync-card__desc {
  grid-column: 2;
  font-size: 0.81rem;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 内容更新 ---------- */
.page-about .newsgrid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

@media (min-width: 900px) {
  .page-about .newsgrid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }
}

.page-about .newsgrid__figure {
  margin-bottom: 0;
}

.page-about .news-facts {
  list-style: none;
  margin: clamp(1.5rem, 4vw, 2.25rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border-left: 2px solid var(--amber);
}

@media (min-width: 760px) {
  .page-about .news-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .news-facts__item {
  background: var(--deep);
  padding: 0.95rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  min-width: 0;
}

.page-about .news-facts__num {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--amber);
  letter-spacing: 0.02em;
}

.page-about .news-facts__cap {
  font-size: 0.78rem;
  line-height: 1.55;
  color: var(--paper);
  opacity: 0.86;
}

/* ---------- 合作与资质 ---------- */
.page-about .partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

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

.page-about .partners__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.page-about .partners__fact {
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  background: var(--hull);
  padding: 1rem 1.1rem;
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  flex-wrap: wrap;
}

.page-about .partners__fact--amber {
  border-left-color: var(--amber);
}

.page-about .partners__fact-num {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-about .partners__fact--amber .partners__fact-num {
  color: var(--amber);
  font-size: 1.1rem;
}

.page-about .partners__fact-cap {
  font-size: 0.85rem;
  color: var(--mist);
}

/* ---------- 团队分工：三列错落卡片 ---------- */
.page-about .teamgrid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
}

@media (min-width: 900px) {
  .page-about .teamgrid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
    gap: 1.5rem;
  }

  .page-about .teamcard--a {
    transform: rotate(-1.1deg);
  }

  .page-about .teamcard--b {
    transform: rotate(0.9deg) translateY(18px);
  }

  .page-about .teamcard--c {
    transform: rotate(-0.6deg) translateY(-4px);
  }
}

.page-about .teamcard {
  border: 1px solid var(--line);
  background: linear-gradient(162deg, var(--hull) 0%, var(--ink) 100%);
  padding: 1.2rem 1.15rem 1.3rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  transition: border-color var(--dur) var(--ease);
}

.page-about .teamcard:hover {
  border-color: rgba(155, 167, 182, 0.55);
}

.page-about .teamcard--a {
  border-top: 2px solid var(--cyan);
}

.page-about .teamcard--b {
  border-top: 2px solid var(--amber);
}

.page-about .teamcard--c {
  border-top: 2px solid var(--pulse);
}

.page-about .teamcard__num {
  margin: 0.15rem 0 0;
  font-size: clamp(2.1rem, 6vw, 3rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .teamcard__text {
  margin: 0;
  font-size: 0.89rem;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 收尾 ---------- */
.page-about .about-close {
  padding: clamp(2.25rem, 6vw, 4rem) 0 clamp(3rem, 7vw, 5rem);
}

.page-about .about-close__inner {
  border: 1px solid var(--line);
  background:
    radial-gradient(70% 130% at 0% 0%, rgba(47, 230, 224, 0.14), transparent 66%),
    radial-gradient(60% 120% at 100% 100%, rgba(255, 122, 47, 0.12), transparent 66%),
    var(--hull);
  padding: clamp(1.5rem, 4.5vw, 2.6rem);
  display: grid;
  gap: 1.15rem;
}

@media (min-width: 860px) {
  .page-about .about-close__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 1.5rem 2rem;
  }

  .page-about .about-close__note {
    grid-column: 1 / -1;
  }
}

.page-about .about-close__title {
  margin: 0;
  font-size: clamp(1.3rem, 3.6vw, 1.85rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--paper);
  max-width: 22ch;
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.page-about .about-close__note {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-close__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 230, 224, 0.45);
  padding-bottom: 1px;
}

.page-about .about-close__note a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .tl__node,
  .page-about .teamcard {
    transition: none;
  }

  @media (min-width: 900px) {
    .page-about .teamcard--a,
    .page-about .teamcard--b,
    .page-about .teamcard--c {
      transform: none;
    }
  }
}