.page-about {
  --about-block: clamp(48px, 8vw, 92px);
  --about-gap: clamp(18px, 3vw, 32px);
}

.page-about .about-hero {
  position: relative;
  padding-block: clamp(26px, 5vw, 52px) clamp(34px, 6vw, 64px);
  border-bottom: var(--line);
  background:
    radial-gradient(880px 420px at 8% -20%, rgba(47, 227, 200, .12), transparent 62%),
    radial-gradient(720px 380px at 96% -6%, rgba(255, 138, 43, .12), transparent 60%),
    radial-gradient(600px 420px at 60% 110%, rgba(122, 46, 143, .16), transparent 64%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

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

.page-about .about-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-about .about-hero h1 {
  margin: 0 0 18px;
  font-size: clamp(1.85rem, 6.4vw, 3.35rem);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.14;
  color: var(--bone);
  text-wrap: balance;
}

.page-about .about-hero__toc {
  margin-top: 26px;
  padding-top: 18px;
  border-top: var(--line);
}

.page-about .about-hero__toc ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__toc a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: var(--line);
  border-radius: var(--r-pill);
  background: rgba(14, 27, 49, .6);
  color: var(--bone);
  font-size: .82rem;
  text-decoration: none;
  transition: border-color .25s ease, color .25s ease, background-color .25s ease;
}

.page-about .about-hero__toc a .num {
  font-size: .7rem;
  color: var(--amber);
  letter-spacing: .06em;
}

.page-about .about-hero__toc a:hover,
.page-about .about-hero__toc a:focus-visible {
  border-color: rgba(47, 227, 200, .6);
  background: rgba(47, 227, 200, .08);
  color: var(--cyan);
}

.page-about .about-hero__figure {
  margin: 0;
  min-width: 0;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  border-radius: var(--r-xl);
  border: var(--line);
}

.page-about .about-hero__figure .media__label {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--rock);
}

.page-about .section {
  padding-block: var(--about-block);
}

.page-about .section + .section {
  border-top: var(--line);
}

.page-about .section-head {
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .section-head__note {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .12em;
  color: var(--rock);
}

.page-about .about-note {
  margin-bottom: clamp(24px, 4vw, 36px);
}

/* ---- 统计条 ---- */

.page-about .stat-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-bottom: clamp(28px, 5vw, 48px);
  border: var(--line);
  border-radius: var(--r-lg);
  background: var(--line-c);
  overflow: hidden;
}

.page-about .stat-strip__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 18px;
  background: var(--panel);
}

.page-about .stat-strip__num {
  font-size: clamp(1.7rem, 6vw, 2.5rem);
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
  letter-spacing: -.02em;
}

.page-about .stat-strip__label {
  font-size: .82rem;
  color: var(--bone);
  opacity: .78;
}

/* ---- 业务范围 ---- */

.page-about .about-scope__lead {
  margin-bottom: clamp(22px, 4vw, 34px);
}

.page-about .scope-list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .scope-list__item {
  position: relative;
  padding: 20px 20px 20px 24px;
  border: var(--line);
  border-radius: var(--r-lg);
  background: var(--panel);
}

.page-about .scope-list__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  bottom: 22px;
  width: 3px;
  border-radius: var(--r-pill);
  background: var(--cyan);
}

.page-about .scope-list__item:nth-child(2)::before {
  background: var(--amber);
}

.page-about .scope-list__item:nth-child(3)::before {
  background: linear-gradient(180deg, var(--grape), var(--rose));
}

.page-about .scope-list__item h3 {
  margin: 0 0 8px;
  font-size: 1.02rem;
  font-weight: 800;
  color: var(--bone);
  line-height: 1.4;
}

.page-about .scope-list__item p {
  margin: 0;
  font-size: .94rem;
  line-height: 1.85;
  color: var(--bone);
  opacity: .82;
}

/* ---- 时间轴 ---- */

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

.page-about .tl__item {
  position: relative;
  padding-left: 26px;
  padding-bottom: 14px;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 24px;
  bottom: -10px;
  width: 1px;
  background: var(--line-c);
}

.page-about .tl__item:last-child::before {
  display: none;
}

.page-about .tl__item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(47, 227, 200, .14);
}

.page-about .tl__item--now::after {
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(255, 138, 43, .18);
}

.page-about .tl__box {
  border: var(--line);
  border-radius: var(--r-lg);
  background: var(--panel);
  overflow: hidden;
  transition: border-color .25s ease, background-color .25s ease;
}

.page-about .tl__box[open] {
  border-color: rgba(47, 227, 200, .38);
  background: linear-gradient(180deg, rgba(47, 227, 200, .07), rgba(14, 27, 49, 1) 42%);
}

.page-about .tl__summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

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

.page-about .tl__year {
  flex: none;
  font-size: clamp(1.6rem, 7vw, 2.1rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--bone);
  transition: color .25s ease;
}

.page-about .tl__box[open] .tl__year {
  color: var(--amber);
}

.page-about .tl__title {
  flex: 1 1 auto;
  min-width: 0;
  font-size: .98rem;
  font-weight: 800;
  line-height: 1.45;
  color: var(--bone);
}

.page-about .tl__mark {
  flex: none;
  align-self: center;
  width: 12px;
  height: 12px;
  border-right: 2px solid var(--rock);
  border-bottom: 2px solid var(--rock);
  transform: rotate(45deg);
  transition: transform .3s ease, border-color .25s ease;
}

.page-about .tl__box[open] .tl__mark {
  transform: rotate(-135deg);
  border-color: var(--cyan);
}

.page-about .tl__body {
  padding: 0 18px 18px;
  border-top: var(--line);
  margin-top: 2px;
}

.page-about .tl__body p {
  margin: 14px 0 0;
  font-size: .94rem;
  line-height: 1.85;
  color: var(--bone);
  opacity: .84;
}

/* ---- 栏目网格 ---- */

.page-about .cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .col-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 168px;
  padding: 22px 20px;
  border-radius: var(--r-lg);
  transition: transform .3s ease, box-shadow .3s ease;
}

.page-about .col-card__freq {
  font-size: .72rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  opacity: .82;
}

.page-about .col-card__title {
  margin: 0;
  font-size: 1.24rem;
  font-weight: 900;
  line-height: 1.3;
  letter-spacing: -.01em;
}

.page-about .col-card__desc {
  margin: 0;
  font-size: .92rem;
  line-height: 1.82;
  opacity: .92;
}

.page-about .col-card--moss {
  background: var(--moss);
  color: var(--bone);
}

.page-about .col-card--clay {
  background: var(--clay);
  color: #180c05;
}

.page-about .col-card--rock {
  background: var(--rock);
  color: #0b0f14;
}

.page-about .col-card--panel {
  background: var(--panel);
  border: var(--line);
  color: var(--bone);
}

.page-about .col-card--panel .col-card__title {
  color: var(--cyan);
}

@media (hover: hover) {
  .page-about .col-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 42px rgba(0, 0, 0, .38);
  }
}

.page-about .about-figure {
  margin: clamp(28px, 5vw, 44px) 0 0;
}

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

.page-about .about-figure .media__label {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--rock);
}

/* ---- 协作生态 ---- */

.page-about .eco {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .eco__figure {
  margin: 0;
  min-width: 0;
}

.page-about .eco__figure img {
  display: block;
  width: 100%;
  max-width: 440px;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: var(--r-xl);
  border: var(--line);
}

.page-about .eco__figure .media__label {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--rock);
}

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

.page-about .eco__body > .prose {
  margin-bottom: 22px;
}

.page-about .eco__roles {
  display: grid;
  gap: 1px;
  margin: 0 0 24px;
  padding: 0;
  border: var(--line);
  border-radius: var(--r-lg);
  background: var(--line-c);
  overflow: hidden;
  list-style: none;
}

.page-about .eco__role {
  display: grid;
  grid-template-columns: 40px 86px minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--panel);
}

.page-about .eco__num {
  font-size: .78rem;
  color: var(--clay);
  letter-spacing: .06em;
}

.page-about .eco__label {
  font-size: .92rem;
  font-weight: 800;
  color: var(--bone);
}

.page-about .eco__desc {
  font-size: .86rem;
  line-height: 1.7;
  color: var(--bone);
  opacity: .78;
}

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

/* ---- 资质卡片 ---- */

.page-about .cred {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .cred__card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 20px;
  border: 1px solid rgba(241, 234, 217, .34);
  border-radius: var(--r-md);
  background: rgba(241, 234, 217, .035);
}

.page-about .cred__label {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .12em;
  color: var(--rock);
}

.page-about .cred__value {
  font-size: clamp(1.16rem, 4vw, 1.42rem);
  font-weight: 800;
  line-height: 1.3;
  color: var(--bone);
  letter-spacing: -.01em;
  word-break: break-word;
}

.page-about .cred__card p {
  margin: 0;
  font-size: .88rem;
  line-height: 1.8;
  color: var(--bone);
  opacity: .74;
}

/* ---- 三条理由 ---- */

.page-about .reasons {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  border: var(--line);
  border-radius: var(--r-lg);
  background: var(--line-c);
  overflow: hidden;
}

.page-about .reason {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 6px 16px;
  padding: 22px 20px;
  background: var(--panel);
}

.page-about .reason__idx {
  grid-row: 1 / span 2;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--amber);
  letter-spacing: -.02em;
}

.page-about .reason__title {
  margin: 0;
  font-size: 1.06rem;
  font-weight: 800;
  line-height: 1.4;
  color: var(--bone);
}

.page-about .reason__desc {
  margin: 0;
  font-size: .92rem;
  line-height: 1.85;
  color: var(--bone);
  opacity: .8;
}

.page-about .reason:nth-child(2) .reason__idx {
  color: var(--cyan);
}

.page-about .reason:nth-child(3) .reason__idx {
  color: var(--rose);
}

/* ---- 结尾行动区 ---- */

.page-about .about-cta {
  padding-block: clamp(36px, 6vw, 68px);
  border-top: var(--line);
  background:
    linear-gradient(120deg, rgba(122, 46, 143, .22), rgba(217, 73, 107, .14) 48%, rgba(255, 138, 43, .12)),
    var(--panel);
}

.page-about .about-cta__box {
  display: grid;
  gap: 14px;
  max-width: 640px;
}

.page-about .about-cta__box h2 {
  margin: 0;
  font-size: clamp(1.3rem, 4.4vw, 1.85rem);
  font-weight: 900;
  line-height: 1.25;
  color: var(--bone);
}

.page-about .about-cta__box p {
  margin: 0;
  font-size: .94rem;
  line-height: 1.85;
  color: var(--bone);
  opacity: .84;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 6px;
}

/* ---- 桌面端 ---- */

@media (min-width: 720px) {
  .page-about .about-hero__toc ol {
    gap: 10px;
  }

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

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

  .page-about .scope-list__item {
    padding: 24px 20px 22px;
  }

  .page-about .scope-list__item::before {
    left: 0;
    right: 0;
    top: 0;
    bottom: auto;
    width: auto;
    height: 3px;
  }

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

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

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 1fr);
    align-items: center;
    gap: clamp(36px, 5vw, 64px);
  }

  .page-about .about-hero__figure img {
    aspect-ratio: 8 / 5;
  }

  .page-about .tl__item {
    display: grid;
    grid-template-columns: 168px minmax(0, 1fr);
    align-items: start;
    gap: 24px;
    padding-left: 0;
    padding-bottom: 18px;
  }

  .page-about .tl__item::before {
    left: 100%;
    margin-left: -84px;
    top: 0;
    bottom: -18px;
  }

  .page-about .tl__item::after {
    left: 100%;
    margin-left: -89px;
    top: 28px;
  }

  .page-about .tl__summary {
    align-items: center;
    padding: 20px 22px;
  }

  .page-about .tl__year {
    font-size: clamp(2.1rem, 3.6vw, 3rem);
  }

  .page-about .tl__body {
    padding: 0 22px 22px;
  }

  .page-about .cols {
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 16px;
  }

  .page-about .col-card--lead {
    grid-row: span 2;
  }

  .page-about .col-card--wide {
    grid-column: span 2;
  }

  .page-about .col-card--lead {
    min-height: 100%;
    justify-content: flex-end;
    padding: 30px 26px;
  }

  .page-about .col-card--lead .col-card__title {
    font-size: 1.6rem;
  }

  .page-about .eco {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
    gap: clamp(32px, 5vw, 60px);
  }

  .page-about .eco__figure {
    position: sticky;
    top: calc(var(--topbar-h) + 28px);
  }

  .page-about .eco__figure img {
    max-width: none;
  }

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

  .page-about .reason {
    grid-template-columns: 64px minmax(0, 1fr);
    padding: 28px 26px;
  }

  .page-about .reason__title {
    font-size: 1.14rem;
  }

  .page-about .reason__desc {
    max-width: 62ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .col-card,
  .page-about .tl__box,
  .page-about .tl__mark,
  .page-about .tl__year,
  .page-about .about-hero__toc a {
    transition: none;
  }

  @media (hover: hover) {
    .page-about .col-card:hover {
      transform: none;
    }
  }
}
</style>