.page-about {
  --about-line: rgba(179, 166, 198, .22);
  --about-soft: rgba(39, 24, 56, .62);
  padding-bottom: 1rem;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: 2.25rem;
}
.page-about .about-crumb .breadcrumb {
  font-size: .82rem;
  color: var(--c-mauve);
}
.page-about .about-crumb .breadcrumb a {
  color: var(--c-cyan);
  text-decoration: none;
}
.page-about .about-crumb .breadcrumb a:hover {
  text-decoration: underline;
}

/* ---------- 封面 ---------- */
.page-about .about-cover {
  position: relative;
  overflow: hidden;
  padding: 1.25rem 0 3rem;
}
.page-about .about-cover::before {
  content: "";
  position: absolute;
  top: -34%;
  left: -18%;
  width: 128%;
  height: 96%;
  background:
    radial-gradient(closest-side, rgba(255, 197, 61, .18), transparent 72%) 12% 44% / 46% 82% no-repeat,
    radial-gradient(closest-side, rgba(37, 230, 208, .13), transparent 72%) 90% 8% / 42% 70% no-repeat;
  pointer-events: none;
  z-index: 0;
}
.page-about .about-cover__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 2.25rem;
}
.page-about .about-cover h1 {
  margin: .85rem 0 1.25rem;
  font-size: clamp(2.05rem, 8vw, 4rem);
  line-height: 1.1;
  letter-spacing: .01em;
}
.page-about .about-cover__lede {
  max-width: 40rem;
  margin: 0;
  font-size: clamp(1rem, 2.6vw, 1.1rem);
  line-height: 1.8;
  color: var(--c-mauve);
}
.page-about .about-cover__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.75rem;
}
.page-about .about-cover__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .7rem;
  margin: 2rem 0 0;
  padding: 0;
}
.page-about .about-cover__stat {
  margin: 0;
  padding: .85rem .75rem;
  border: var(--edge) solid var(--c-tiger);
  border-radius: var(--r-card);
  background: var(--about-soft);
  box-shadow: var(--hard-sm);
}
.page-about .about-cover__stat dt {
  margin: 0;
}
.page-about .about-cover__stat b {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(1.3rem, 5.6vw, 1.95rem);
  line-height: 1.05;
  color: var(--c-gold);
  letter-spacing: -.01em;
}
.page-about .about-cover__stat dd {
  margin: .35rem 0 0;
}
.page-about .about-cover__stat span {
  display: block;
  font-size: .76rem;
  line-height: 1.45;
  color: var(--c-mauve);
}
.page-about .about-cover__media {
  margin: 0;
  border: var(--edge) solid var(--c-tiger);
  border-radius: var(--r-card);
  overflow: hidden;
  box-shadow: var(--hard);
}
.page-about .about-cover__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 章节目录 ---------- */
.page-about .about-index {
  margin-top: 2.4rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--about-line);
}
.page-about .about-index__list {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem 1.4rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-index__list a {
  display: inline-flex;
  align-items: baseline;
  gap: .45rem;
  font-size: .84rem;
  color: var(--c-mauve);
  text-decoration: none;
}
.page-about .about-index__list a .num {
  font-size: .74rem;
  color: var(--c-gold);
}
.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--c-cyan);
}

/* ---------- 六件事 ---------- */
.page-about .about-six__list {
  display: grid;
  gap: 0;
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-line);
}
.page-about .about-six__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 1.1rem;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--about-line);
}
.page-about .about-six__no {
  grid-row: 1 / span 2;
  font-size: 1rem;
  color: var(--c-gold);
  letter-spacing: .06em;
  padding-top: .18rem;
}
.page-about .about-six__name {
  margin: 0 0 .4rem;
  font-size: 1.06rem;
  font-weight: 700;
  color: var(--c-paper);
}
.page-about .about-six__item p {
  margin: 0;
  font-size: .94rem;
  line-height: 1.75;
  color: var(--c-mauve);
}

/* ---------- 团队 ---------- */
.page-about .about-team .filter-bar {
  margin: 1.75rem 0 1.5rem;
}
.page-about .about-team__list {
  display: grid;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-team__row {
  margin: 0;
  padding: 1.25rem 1.15rem 1.25rem 1.35rem;
  border: var(--edge) solid var(--c-tiger);
  border-left: 6px solid var(--c-gold);
  border-radius: var(--r-card);
  background: linear-gradient(160deg, rgba(39, 24, 56, .82), rgba(11, 6, 20, .88));
  box-shadow: var(--hard-sm);
  transition: transform .28s cubic-bezier(.2, .8, .2, 1), border-color .28s, box-shadow .28s;
}
.page-about .about-team__row:hover,
.page-about .about-team__row:focus-within {
  transform: translate(-3px, -3px);
  border-left-color: var(--c-cyan);
  box-shadow: var(--hard);
}
.page-about .about-team__name {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .6rem;
  margin: 0 0 .55rem;
  font-size: 1.08rem;
  color: var(--c-paper);
}
.page-about .about-team__count {
  font-size: .82rem;
  color: var(--c-gold);
  letter-spacing: .06em;
}
.page-about .about-team__desc {
  margin: 0;
  font-size: .94rem;
  line-height: 1.75;
  color: var(--c-mauve);
}
.page-about .about-team__meta {
  margin: .7rem 0 0;
  font-size: .8rem;
  color: var(--c-cyan);
  letter-spacing: .02em;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline__banner {
  margin: 1.75rem 0 2.25rem;
  border: var(--edge) solid var(--c-tiger);
  border-radius: var(--r-card);
  overflow: hidden;
  box-shadow: var(--hard);
}
.page-about .about-timeline__banner img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-timeline__list {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: .35rem;
  top: .5rem;
  bottom: 1.5rem;
  width: 2px;
  background: linear-gradient(180deg, var(--c-gold), var(--c-cyan) 58%, rgba(37, 230, 208, .12));
}
.page-about .about-timeline__node {
  position: relative;
  padding: 0 0 1.9rem 2rem;
}
.page-about .about-timeline__node::before {
  content: "";
  position: absolute;
  left: 0;
  top: .55rem;
  width: .72rem;
  height: .72rem;
  box-sizing: content-box;
  border: 3px solid var(--c-gold);
  border-radius: 50%;
  background: var(--c-night);
  transition: background .28s, border-color .28s, box-shadow .28s;
}
.page-about .about-timeline__node:hover::before,
.page-about .about-timeline__node:focus-within::before {
  background: var(--c-gold);
  border-color: var(--c-cyan);
  box-shadow: var(--glow-gold);
}
.page-about .about-timeline__year {
  display: block;
  margin-bottom: .45rem;
  font-size: clamp(1.45rem, 6vw, 2rem);
  line-height: 1.1;
  color: var(--c-gold);
  letter-spacing: .02em;
}
.page-about .about-timeline__body {
  padding: 1rem 1.1rem;
  border: var(--edge) solid var(--c-tiger);
  border-radius: var(--r-card);
  background: var(--about-soft);
  transition: border-color .3s, background .3s, transform .3s;
}
.page-about .about-timeline__node:hover .about-timeline__body {
  border-color: rgba(255, 197, 61, .7);
  background: rgba(39, 24, 56, .92);
  transform: translateX(4px);
}
.page-about .about-timeline__body h3 {
  margin: 0 0 .4rem;
  font-size: 1rem;
  color: var(--c-paper);
}
.page-about .about-timeline__body p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.75;
  color: var(--c-mauve);
}

/* ---------- 五步流程 ---------- */
.page-about .about-process__list {
  display: grid;
  gap: .9rem;
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-process__step {
  margin: 0;
  padding: 1.2rem 1.1rem 1.3rem;
  border: var(--edge) solid var(--c-tiger);
  border-top: 5px solid var(--c-cyan);
  border-radius: var(--r-card);
  background: rgba(23, 17, 38, .92);
  box-shadow: var(--hard-sm);
}
.page-about .about-process__step:nth-child(3) {
  border-top-color: var(--c-gold);
}
.page-about .about-process__step:nth-child(5) {
  border-top-color: var(--c-amber);
}
.page-about .about-process__no {
  display: block;
  margin-bottom: .5rem;
  font-size: 1.35rem;
  color: var(--c-gold);
  letter-spacing: .06em;
}
.page-about .about-process__step h3 {
  margin: 0 0 .5rem;
  font-size: 1rem;
  color: var(--c-paper);
}
.page-about .about-process__step p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.72;
  color: var(--c-mauve);
}
.page-about .about-process__meta {
  margin-top: .8rem !important;
  padding-top: .7rem;
  border-top: 1px dashed rgba(179, 166, 198, .28);
  font-size: .78rem;
  color: var(--c-cyan);
}

/* ---------- 坚持的事 ---------- */
.page-about .about-principles__list {
  display: grid;
  gap: 1rem;
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-principles__item {
  margin: 0;
  padding: 1.3rem 1.2rem 1.35rem;
  border: var(--edge) solid var(--c-tiger);
  border-radius: var(--r-card);
  background: linear-gradient(150deg, rgba(39, 24, 56, .72), rgba(11, 6, 20, .9));
  box-shadow: var(--hard);
}
.page-about .about-principles__item h3 {
  margin: 0 0 .6rem;
  font-size: 1.02rem;
  color: var(--c-gold);
}
.page-about .about-principles__item p {
  margin: 0;
  font-size: .94rem;
  line-height: 1.78;
  color: var(--c-mauve);
}

/* ---------- 合肥 ---------- */
.page-about .about-hefei {
  position: relative;
  margin-top: 1rem;
  border: var(--edge) solid var(--c-tiger);
  border-radius: var(--r-card);
  overflow: hidden;
  background: var(--c-night);
  box-shadow: var(--hard);
}
.page-about .about-hefei__pattern {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.page-about .about-hefei__pattern img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .34;
}
.page-about .about-hefei__pattern::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, rgba(11, 6, 20, .94) 24%, rgba(11, 6, 20, .72) 68%, rgba(39, 24, 56, .58));
}
.page-about .about-hefei__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 1.6rem;
  padding: 2.1rem 1.35rem;
}
.page-about .about-hefei__text h2 {
  margin: .7rem 0 1rem;
  font-size: clamp(1.5rem, 5.4vw, 2.2rem);
  line-height: 1.25;
}
.page-about .about-hefei__text p {
  margin: 0 0 1rem;
  font-size: .96rem;
  line-height: 1.8;
  color: var(--c-mauve);
  max-width: 34rem;
}
.page-about .about-hefei__text .btn {
  margin-top: .4rem;
}
.page-about .about-hefei__marks {
  display: grid;
  gap: .7rem;
}
.page-about .about-hefei__mark {
  margin: 0;
  padding: .85rem 1rem;
  border: 2px solid rgba(255, 197, 61, .35);
  border-radius: var(--r-card);
  background: rgba(11, 6, 20, .62);
  font-size: .86rem;
  line-height: 1.6;
  color: var(--c-paper);
}
.page-about .about-hefei__mark .num {
  display: inline-block;
  min-width: 4.2rem;
  margin-right: .5rem;
  font-size: 1.15rem;
  color: var(--c-gold);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-six__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 2.5rem;
  }
  .page-about .about-timeline__node {
    display: grid;
    grid-template-columns: 7.5rem minmax(0, 1fr);
    column-gap: 1.75rem;
    align-items: start;
  }
  .page-about .about-timeline__year {
    padding-top: .5rem;
    text-align: right;
    margin-bottom: 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-cover {
    padding: 2rem 0 4rem;
  }
  .page-about .about-cover__grid {
    grid-template-columns: 7fr 5fr;
    gap: 3.25rem;
    align-items: center;
  }
  .page-about .about-cover__media {
    transform: translateY(1.5rem);
  }
  .page-about .about-cover__stats {
    gap: .85rem;
  }
  .page-about .about-team__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.25rem;
  }
  .page-about .about-principles__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.25rem;
  }
  .page-about .about-hefei__inner {
    grid-template-columns: 6fr 5fr;
    gap: 2.75rem;
    padding: 3rem 2.6rem;
    align-items: center;
  }
}

@media (min-width: 1080px) {
  .page-about .about-six__list {
    border-top: none;
  }
  .page-about .about-six__item {
    border-bottom: 1px solid var(--about-line);
  }
  .page-about .about-process__list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__row,
  .page-about .about-timeline__body,
  .page-about .about-timeline__node::before {
    transition: none;
  }
  .page-about .about-team__row:hover,
  .page-about .about-team__row:focus-within,
  .page-about .about-timeline__node:hover .about-timeline__body {
    transform: none;
  }
}
</main>