.page-about {
  background: var(--bg);
  color: var(--text);
}

.page-about .cut {
  clip-path: polygon(
    var(--notch) 0,
    100% 0,
    100% calc(100% - var(--notch)),
    calc(100% - var(--notch)) 100%,
    0 100%,
    0 var(--notch)
  );
}

.page-about .about-sec {
  padding: clamp(2.75rem, 7vw, 6rem) 0;
}

.page-about .about-sec__head {
  max-width: 48rem;
  margin-bottom: clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-sec__head .section__title {
  margin: .6rem 0 0;
}

.page-about .about-sec__head .lede {
  margin-top: .9rem;
}

.page-about h2.section__title em,
.page-about h1 em {
  font-style: normal;
  color: var(--mint);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: clamp(1.25rem, 3vw, 2rem);
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .06em;
  color: var(--text-dim);
}

.page-about .breadcrumb li {
  display: flex;
  align-items: center;
  gap: .45rem;
}

.page-about .breadcrumb li + li::before {
  content: "/";
  color: var(--gray);
}

.page-about .breadcrumb a {
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px dashed var(--line-strong);
  padding-bottom: 1px;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--mint-soft);
  border-bottom-color: var(--mint-soft);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(2rem, 5.5vw, 4rem) 0 clamp(2.5rem, 7vw, 5rem);
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.page-about .about-hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .38;
  filter: saturate(.62) contrast(1.05);
}

.page-about .about-hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(90% 70% at 10% 0%, rgba(29, 233, 182, .26), transparent 62%),
    linear-gradient(180deg, rgba(11, 42, 34, .6) 0%, rgba(11, 42, 34, .92) 56%, var(--ink) 100%);
}

.page-about .about-hero__inner {
  position: relative;
}

.page-about .about-hero h1 {
  margin: .7rem 0 1.1rem;
  max-width: 22ch;
  font-size: clamp(2.35rem, 6.4vw, 4.5rem);
  line-height: 1.08;
  font-weight: 800;
  letter-spacing: -.02em;
}

.page-about .about-hero h1 em {
  background: linear-gradient(100deg, var(--mint) 0%, var(--mint-soft) 52%, var(--orange) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.page-about .about-hero .lede {
  max-width: 44rem;
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.75rem;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.15rem 1rem;
  margin: clamp(2rem, 5vw, 3rem) 0 0;
  padding-top: 1.5rem;
  border-top: 1px dashed var(--line);
}

.page-about .about-hero__stats > div {
  display: flex;
  flex-direction: column-reverse;
  gap: .4rem;
  min-width: 0;
}

.page-about .about-hero__stats dt {
  font-size: .76rem;
  letter-spacing: .05em;
  color: var(--text-dim);
  line-height: 1.5;
}

.page-about .about-hero__stats dd {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.4vw, 2.2rem);
  line-height: 1;
  color: var(--snow);
}

.page-about .about-hero__stats dd span {
  margin-left: .16rem;
  font-size: .58em;
  color: var(--orange);
}

/* ---------- 品牌起点 ---------- */
.page-about .about-origin__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
}

.page-about .about-origin__lead p + p {
  margin-top: 1rem;
}

.page-about .about-origin__lead p {
  max-width: 42rem;
}

.page-about .about-origin__facts {
  padding: 1.5rem;
  background: linear-gradient(160deg, rgba(29, 233, 182, .12), rgba(18, 61, 50, .92) 46%, rgba(7, 17, 15, .9));
  border: 1px solid var(--line-strong);
  box-shadow: var(--lift);
}

.page-about .facts__title {
  margin: 0 0 1.1rem;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .14em;
  color: var(--mint);
  text-transform: uppercase;
}

.page-about .facts__list {
  margin: 0;
  display: grid;
  gap: .85rem;
}

.page-about .facts__list > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: .75rem;
  padding-bottom: .7rem;
  border-bottom: 1px dashed var(--line-soft);
}

.page-about .facts__list dt {
  font-size: .86rem;
  color: var(--text-dim);
}

.page-about .facts__list dd {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--snow);
}

.page-about .facts__list dd span {
  margin-left: .2rem;
  font-size: .62em;
  color: var(--orange);
}

.page-about .facts__note {
  margin: 1.15rem 0 0;
  font-size: .85rem;
  line-height: 1.75;
  color: var(--text-dim);
}

/* ---------- 服务体系 ---------- */
.page-about .about-layers {
  background: linear-gradient(180deg, transparent, rgba(18, 61, 50, .35) 34%, transparent);
}

.page-about .about-layers__flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.1rem;
}

.page-about .layer {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 1rem;
  padding: 1.4rem 1.3rem 1.4rem 1.4rem;
  border-left: 3px solid var(--mint);
  background: linear-gradient(150deg, rgba(18, 61, 50, .88), rgba(11, 42, 34, .74));
  clip-path: polygon(
    var(--notch) 0,
    100% 0,
    100% calc(100% - var(--notch)),
    calc(100% - var(--notch)) 100%,
    0 100%,
    0 var(--notch)
  );
  transition: transform .3s var(--ease), background .3s var(--ease), border-color .3s var(--ease);
}

.page-about .layer:hover {
  transform: translateX(5px);
  border-left-color: var(--orange);
  background: linear-gradient(150deg, rgba(29, 233, 182, .18), rgba(18, 61, 50, .92));
}

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

.page-about .layer__idx {
  font-size: 1.05rem;
  color: var(--orange);
  padding-top: .18rem;
}

.page-about .layer__title {
  margin: 0 0 .5rem;
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-about .layer__body p {
  font-size: .95rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .layer__meta {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: .9rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .layer__meta li {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .04em;
  color: var(--mint);
  border: 1px dashed var(--line-strong);
  padding: .22rem .6rem;
}

/* ---------- 常用人群社群 ---------- */
.page-about .about-crowd__grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: start;
}

.page-about .about-crowd__media {
  position: relative;
  padding-bottom: 3.5rem;
  padding-right: 1rem;
}

.page-about .about-crowd__media .media {
  position: relative;
}

.page-about .about-crowd__map {
  position: absolute;
  right: 0;
  bottom: 0;
  width: min(58%, 15rem);
  aspect-ratio: 4 / 3;
  background-color: rgba(7, 17, 15, .9);
  background-image: radial-gradient(rgba(29, 233, 182, .45) 1.2px, transparent 1.4px);
  background-size: 14px 14px;
  border: 1px solid var(--line-strong);
  clip-path: polygon(
    14px 0,
    100% 0,
    100% calc(100% - 14px),
    calc(100% - 14px) 100%,
    0 100%,
    0 14px
  );
}

.page-about .map-dot {
  position: absolute;
  left: var(--x);
  top: var(--y);
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 5px rgba(255, 159, 69, .16);
  transform: translate(-50%, -50%);
}

.page-about .about-crowd__text p {
  max-width: 38rem;
}

.page-about .crowd-list {
  list-style: none;
  margin: 1.6rem 0 0;
  padding: 0;
  display: grid;
  gap: .85rem;
}

.page-about .crowd-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .85rem;
  align-items: start;
  padding-bottom: .85rem;
  border-bottom: 1px dashed var(--line-soft);
}

.page-about .crowd-list .tag {
  white-space: nowrap;
}

.page-about .crowd-list p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 协作网络 ---------- */
.page-about .about-network__grid {
  display: grid;
  gap: 1rem;
}

.page-about .net-card {
  padding: 1.5rem 1.4rem;
  background: rgba(18, 61, 50, .62);
  border-top: 2px solid var(--mint);
  transition: background .3s var(--ease), border-color .3s var(--ease);
}

.page-about .net-card:hover {
  background: rgba(29, 233, 182, .12);
  border-top-color: var(--orange);
}

.page-about .net-card__title {
  margin: 0 0 .65rem;
  font-size: 1.1rem;
  font-weight: 800;
}

.page-about .net-card p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 发展历程 ---------- */
.page-about .about-history {
  position: relative;
  isolation: isolate;
  overflow: hidden;
}

.page-about .about-history__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.page-about .about-history__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .18;
}

.page-about .about-history__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, var(--ink) 0%, rgba(11, 42, 34, .82) 30%, rgba(11, 42, 34, .86) 70%, var(--ink) 100%);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 1.75rem;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: .6rem;
  bottom: .6rem;
  width: 2px;
  background: linear-gradient(180deg, var(--mint) 0%, var(--track) 62%, transparent 100%);
}

.page-about .tl-item {
  position: relative;
  padding: 1.1rem 0 1.15rem;
  border-bottom: 1px dashed var(--line-soft);
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -1.75rem;
  top: 1.55rem;
  width: 11px;
  height: 11px;
  margin-left: 0;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--mint);
  transform: translateX(-.05rem);
  transition: background .3s var(--ease), border-color .3s var(--ease);
}

.page-about .tl-item:hover::before,
.page-about .tl-item:focus-within::before {
  background: var(--orange);
  border-color: var(--orange);
}

.page-about .tl-item:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 4px;
}

.page-about .tl-stage {
  margin: 0 0 .3rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .1em;
  color: var(--mint);
  text-transform: uppercase;
}

.page-about .tl-title {
  margin: 0;
  font-size: 1.18rem;
  font-weight: 800;
}

.page-about .tl-note {
  max-height: 0;
  margin-top: 0;
  opacity: 0;
  overflow: hidden;
  font-size: .92rem;
  line-height: 1.85;
  color: var(--mist);
  transition: max-height .45s var(--ease), opacity .3s var(--ease), margin-top .3s var(--ease);
}

.page-about .tl-item:hover .tl-note,
.page-about .tl-item:focus-within .tl-note {
  max-height: 14rem;
  margin-top: .6rem;
  opacity: 1;
}

.page-about .about-history__hint {
  margin: 1.4rem 0 0;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .05em;
  color: var(--text-dim);
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-reach__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .9rem;
}

.page-about .reach-stat {
  display: flex;
  flex-direction: column;
  gap: .5rem;
  padding: 1.35rem 1.2rem;
  background: linear-gradient(160deg, rgba(18, 61, 50, .92), rgba(11, 42, 34, .7));
  border-bottom: 2px solid var(--line-strong);
  transition: border-color .3s var(--ease), background .3s var(--ease);
}

.page-about .reach-stat:hover {
  border-bottom-color: var(--orange);
  background: linear-gradient(160deg, rgba(29, 233, 182, .14), rgba(11, 42, 34, .82));
}

.page-about .reach-stat__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.9rem, 4.4vw, 2.7rem);
  line-height: 1;
  color: var(--mint);
}

.page-about .reach-stat__label {
  font-size: .86rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-reach__note {
  max-width: 52rem;
  margin: 1.6rem 0 0;
  font-size: .92rem;
  line-height: 1.85;
  color: var(--text-dim);
}

/* ---------- 承诺与联系 ---------- */
.page-about .about-cta__box {
  display: grid;
  gap: 1.75rem;
  padding: clamp(1.75rem, 4.5vw, 3rem);
  background:
    radial-gradient(120% 120% at 0% 0%, rgba(29, 233, 182, .2), transparent 58%),
    linear-gradient(150deg, rgba(18, 61, 50, .96), rgba(7, 17, 15, .92));
  border: 1px solid var(--line-strong);
  box-shadow: var(--lift);
}

.page-about .about-cta__text p {
  max-width: 44rem;
  color: var(--mist);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  align-self: end;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-reach__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

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

@media (min-width: 900px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
  }

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

  .page-about .about-cta__box {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: center;
  }
}

@media (min-width: 940px) {
  .page-about .about-crowd__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: center;
  }

  .page-about .about-crowd__media {
    padding-bottom: 3.5rem;
    padding-right: 1.75rem;
  }

  .page-about .about-crowd__map {
    right: 0;
    bottom: 0;
  }
}

@media (max-width: 860px) {
  .page-about .tl-note {
    max-height: none;
    margin-top: .6rem;
    opacity: 1;
  }

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

@media (max-width: 560px) {
  .page-about .about-crowd__media {
    padding-right: 0;
    padding-bottom: 3rem;
  }

  .page-about .about-crowd__map {
    width: min(70%, 13rem);
  }

  .page-about .about-hero__actions .btn,
  .page-about .about-cta__actions .btn {
    flex: 1 1 100%;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .layer,
  .page-about .net-card,
  .page-about .reach-stat,
  .page-about .tl-note,
  .page-about .tl-item::before {
    transition: none;
  }

  .page-about .layer:hover {
    transform: none;
  }
}

.page-about {
  --x: inherit;
  --y: inherit;
}