.page-about {
  --about-radius: 22px 6px 22px 6px;
  --about-card-bg: linear-gradient(158deg, rgba(36, 74, 61, .42), rgba(20, 23, 25, .92) 64%);
  --about-line: rgba(58, 68, 65, .62);
  background: var(--bg);
  color: var(--text);
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 1.25rem) 0 clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -18% -12% auto -22%;
  height: 640px;
  background:
    radial-gradient(circle at 22% 16%, rgba(79, 224, 200, .16), transparent 62%),
    radial-gradient(circle at 80% 4%, rgba(230, 180, 80, .10), transparent 58%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(58, 68, 65, .34) 1px, transparent 1px);
  background-size: 100% 72px;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, .8), transparent 72%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, .8), transparent 72%);
  pointer-events: none;
}

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

.page-about .about-crumb {
  margin-bottom: clamp(1.5rem, 3vw, 2.5rem);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(2rem, 5vw, 3rem);
}

.page-about .about-hero h1 {
  margin: .7rem 0 1.1rem;
  font-size: var(--fs-h1);
  line-height: 1.1;
  font-weight: 900;
  letter-spacing: .012em;
}

.page-about .about-hero__lede {
  max-width: 48ch;
  margin: 0;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--text-soft);
}

.page-about .about-hero__points {
  display: grid;
  gap: .65rem;
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__points li {
  display: flex;
  align-items: baseline;
  gap: .65rem;
  font-size: .9375rem;
  color: var(--text-soft);
}

.page-about .about-dot {
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  transform: translateY(-2px);
}

.page-about .about-dot--cyan { background: var(--c-cyan); }
.page-about .about-dot--amber { background: var(--c-amber); }
.page-about .about-dot--clay { background: var(--c-clay); }

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.9rem;
}

.page-about .about-hero__frame {
  position: relative;
  margin: 0;
  padding: clamp(.9rem, 2vw, 1.35rem);
  border: 1px solid var(--about-line);
  border-radius: var(--about-radius);
  background: linear-gradient(152deg, rgba(36, 74, 61, .55), rgba(20, 23, 25, .94) 62%);
  box-shadow: var(--shadow);
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  top: 0;
  left: 14%;
  right: 14%;
  height: 7px;
  background-image: repeating-linear-gradient(90deg, var(--c-cyan) 0 1px, transparent 1px 15px);
  opacity: .4;
}

.page-about .about-hero__frame img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 14px 4px 14px 4px;
}

.page-about .about-hero__badge {
  position: absolute;
  top: -.8rem;
  right: clamp(.9rem, 2vw, 1.4rem);
  z-index: 2;
  padding: .28rem .7rem;
  font-size: .75rem;
  letter-spacing: .12em;
  color: var(--c-abyss);
  background: var(--c-amber);
  border-radius: 2px;
}

.page-about .about-hero__frame figcaption {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: .5rem 1.25rem;
  margin-top: .95rem;
  font-size: var(--fs-caption);
  line-height: 1.6;
  color: var(--text-dim);
}

/* ---------- 左右分屏骨架 ---------- */
.page-about .about-layout {
  display: grid;
  gap: clamp(2rem, 4vw, 3rem);
  padding-bottom: clamp(3rem, 6vw, 5rem);
}

.page-about .about-layout__aside .index-rail {
  padding-left: 1rem;
  border-left: 1px solid var(--line-soft);
}

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

.page-about .chapter-block {
  padding-top: clamp(2.25rem, 4vw, 3.25rem);
  border-top: 1px solid var(--line-soft);
}

.page-about .chapter-block:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .chapter-block .chapter {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(.85rem, 2vw, 1.5rem);
  align-items: start;
  margin-bottom: clamp(1.5rem, 3vw, 2.25rem);
}

.page-about .chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(2.5rem, 6vw, 3.6rem);
  font-weight: 700;
  line-height: .9;
  letter-spacing: -.02em;
  color: rgba(79, 224, 200, .3);
}

.page-about .chapter__title {
  margin: 0 0 .5rem;
  font-size: var(--fs-h2);
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: .01em;
}

.page-about .chapter__desc {
  max-width: 58ch;
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: 1.15rem;
  margin: 0;
  padding: 0 0 0 1.9rem;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(to bottom, rgba(79, 224, 200, .6), rgba(58, 68, 65, .25));
}

.page-about .about-timeline .timeline__item {
  position: relative;
  padding: 1.1rem 1.2rem 1.2rem;
  border: 1px solid var(--line-soft);
  border-radius: var(--about-radius);
  background: var(--about-card-bg);
  transition: transform .5s var(--ease), border-color .5s var(--ease);
}

.page-about .about-timeline .timeline__item::before {
  content: "";
  position: absolute;
  left: -1.9rem;
  top: 1.45rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 2px solid var(--c-cyan);
  background: var(--c-abyss);
}

.page-about .about-timeline .timeline__item:nth-child(even) {
  background: linear-gradient(158deg, rgba(166, 106, 74, .2), rgba(20, 23, 25, .92) 64%);
}

.page-about .about-timeline .timeline__item:nth-child(even)::before {
  border-color: var(--c-amber);
}

.page-about .about-timeline .timeline__item:hover {
  transform: translateX(4px);
  border-color: rgba(79, 224, 200, .45);
}

.page-about .about-timeline .timeline__meta {
  display: flex;
  align-items: baseline;
  gap: .7rem;
  margin: 0 0 .55rem;
  font-size: var(--fs-caption);
  letter-spacing: .1em;
  color: var(--text-dim);
}

.page-about .about-year {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--c-amber);
}

.page-about .about-timeline h3 {
  margin: 0 0 .45rem;
  font-size: var(--fs-h3);
  line-height: 1.3;
  font-weight: 700;
}

.page-about .about-timeline p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--text-soft);
}

/* ---------- 数据资产卡片 ---------- */
.page-about .about-assets {
  margin-bottom: clamp(1.5rem, 3vw, 2.25rem);
}

.page-about .about-asset {
  position: relative;
  overflow: hidden;
  padding: 1.4rem 1.35rem 1.5rem;
  border: 1px solid var(--line-soft);
  border-radius: var(--about-radius);
  background: var(--about-card-bg);
  transition: transform .5s var(--ease), border-color .5s var(--ease), box-shadow .5s var(--ease);
}

.page-about .about-asset::after {
  content: "";
  position: absolute;
  top: 0;
  left: 1.35rem;
  right: 1.35rem;
  height: 2px;
  background: linear-gradient(90deg, var(--c-cyan), rgba(79, 224, 200, 0));
  transform: scaleX(.22);
  transform-origin: left center;
  transition: transform .6s var(--ease);
}

.page-about .about-asset:hover,
.page-about .about-asset:focus-within {
  transform: translateY(-4px);
  border-color: rgba(79, 224, 200, .5);
  box-shadow: 0 22px 44px -30px rgba(0, 0, 0, .95);
}

.page-about .about-asset:hover::after,
.page-about .about-asset:focus-within::after {
  transform: scaleX(1);
}

.page-about .about-asset .tag {
  display: inline-block;
  margin-bottom: .85rem;
}

.page-about .about-asset .card__title {
  margin: 0 0 .6rem;
  font-size: var(--fs-h3);
  line-height: 1.28;
  font-weight: 700;
}

.page-about .about-asset .card__text {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .about-asset__note {
  margin: 1rem 0 0;
  padding-left: .8rem;
  border-left: 2px solid rgba(230, 180, 80, .55);
  font-size: var(--fs-caption);
  line-height: 1.7;
  color: var(--text-dim);
}

/* ---------- 米白引言块 ---------- */
.page-about .about-statement {
  margin: 0 0 clamp(1.5rem, 3vw, 2.25rem);
  padding: clamp(1.5rem, 3vw, 2.1rem) clamp(1.25rem, 3vw, 2.1rem);
  border-radius: var(--about-radius);
  background: var(--c-paper);
  color: var(--c-abyss);
}

.page-about .about-statement__text {
  max-width: 42ch;
  margin: 0;
  font-size: clamp(1.0625rem, 2.2vw, 1.375rem);
  line-height: 1.72;
  font-weight: 600;
}

.page-about .about-statement__label {
  margin: 1.1rem 0 0;
  font-size: var(--fs-caption);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--c-clay);
}

/* ---------- 全宽数据条 ---------- */
.page-about .about-band {
  margin-bottom: clamp(1.5rem, 3vw, 2.25rem);
  border: 1px solid rgba(79, 224, 200, .22);
  border-left: 3px solid var(--c-cyan);
  border-radius: var(--about-radius);
  background: linear-gradient(120deg, rgba(36, 74, 61, .55), rgba(20, 23, 25, .9));
}

.page-about .about-band__inner {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem 1rem;
  padding: clamp(1.25rem, 3vw, 1.8rem);
}

.page-about .about-band .stat {
  display: grid;
  gap: .35rem;
  min-width: 0;
}

.page-about .about-band .stat__label {
  font-size: var(--fs-caption);
  letter-spacing: .06em;
  color: var(--text-dim);
}

.page-about .about-band .stat__value {
  font-size: clamp(1.35rem, 3vw, 1.65rem);
  font-weight: 700;
  color: var(--text);
}

.page-about .about-band .stat--cyan .stat__value { color: var(--c-cyan); }
.page-about .about-band .stat--amber .stat__value { color: var(--c-amber); }
.page-about .about-band .stat--rust .stat__value { color: #C77A7A; }

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 clamp(1.5rem, 3vw, 2rem);
  padding: .85rem;
  border: 1px solid var(--line-soft);
  border-radius: var(--about-radius);
  background: rgba(20, 23, 25, .72);
}

.page-about .about-figure img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: 14px 4px 14px 4px;
}

.page-about .about-figure figcaption {
  margin-top: .8rem;
  font-size: var(--fs-caption);
  line-height: 1.65;
  color: var(--text-dim);
}

.page-about .about-figure--side {
  margin-bottom: 0;
}

/* ---------- 团队事实表 ---------- */
.page-about .about-facts {
  display: grid;
  gap: .9rem;
  margin: 0;
}

.page-about .about-fact {
  display: grid;
  gap: .35rem;
  padding: 1rem 1.15rem;
  border: 1px solid var(--line-soft);
  border-radius: var(--about-radius);
  background: rgba(20, 23, 25, .7);
}

.page-about .about-fact dt {
  font-size: var(--fs-caption);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.page-about .about-fact dd {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .about-fact--wide {
  background: linear-gradient(140deg, rgba(36, 74, 61, .45), rgba(20, 23, 25, .85));
}

/* ---------- 服务范围 ---------- */
.page-about .about-reach__list {
  display: grid;
  gap: 1.25rem;
  margin: 0 0 1.4rem;
  padding: 0;
  list-style: none;
}

.page-about .about-reach__list > li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
}

.page-about .about-reach__num {
  font-size: clamp(1.75rem, 5vw, 2.35rem);
  font-weight: 700;
  line-height: 1;
  color: rgba(79, 224, 200, .75);
  min-width: 2.6ch;
}

.page-about .about-reach__list h3 {
  margin: 0 0 .35rem;
  font-size: 1.0625rem;
  font-weight: 700;
}

.page-about .about-reach__list p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .about-inline-link {
  display: inline-block;
  font-size: .9375rem;
  color: var(--c-amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(230, 180, 80, .45);
  padding-bottom: 2px;
}

.page-about .about-inline-link:hover {
  color: var(--c-cyan);
  border-bottom-color: rgba(79, 224, 200, .55);
}

/* ---------- 服务流程 ---------- */
.page-about .about-steps {
  display: grid;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: about-step;
}

.page-about .about-step {
  position: relative;
  padding: 1.2rem 1.2rem 1.3rem;
  border: 1px solid var(--line-soft);
  border-left: 2px solid rgba(230, 180, 80, .5);
  border-radius: var(--about-radius);
  background: var(--about-card-bg);
  transition: border-color .5s var(--ease), transform .5s var(--ease);
}

.page-about .about-step:hover {
  transform: translateX(4px);
  border-color: rgba(79, 224, 200, .45);
  border-left-color: var(--c-cyan);
}

.page-about .about-step__num {
  display: block;
  margin-bottom: .6rem;
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--c-amber);
}

.page-about .about-step h3 {
  margin: 0 0 .45rem;
  font-size: 1.0625rem;
  font-weight: 700;
}

.page-about .about-step p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--text-soft);
}

/* ---------- 收尾引导 ---------- */
.page-about .about-cta {
  display: grid;
  gap: 1.5rem;
  margin-top: clamp(2.25rem, 4vw, 3.25rem);
  padding: clamp(1.6rem, 3.5vw, 2.5rem);
  border: 1px solid rgba(230, 180, 80, .28);
  border-radius: var(--about-radius);
  background:
    radial-gradient(circle at 88% 12%, rgba(230, 180, 80, .16), transparent 58%),
    linear-gradient(150deg, rgba(36, 74, 61, .6), rgba(20, 23, 25, .95) 70%);
}

.page-about .about-cta h2 {
  margin: 0 0 .75rem;
  font-size: var(--fs-h2);
  line-height: 1.2;
  font-weight: 800;
}

.page-about .about-cta p {
  max-width: 56ch;
  margin: 0;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--text-soft);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-band__inner {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.15rem;
  }
}

@media (min-width: 1000px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, .96fr);
    align-items: center;
    gap: clamp(2.5rem, 5vw, 4.5rem);
  }
}

@media (min-width: 1040px) {
  .page-about .about-layout {
    grid-template-columns: var(--rail) minmax(0, 1fr);
    align-items: start;
    gap: clamp(2.5rem, 4vw, 4rem);
  }

  .page-about .about-layout__aside {
    position: sticky;
    top: calc(var(--header-h) + 2rem);
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: center;
  }

  .page-about .about-cta__links {
    justify-content: flex-end;
  }
}

@media (max-width: 480px) {
  .page-about .about-timeline {
    padding-left: 1.5rem;
  }

  .page-about .about-timeline .timeline__item::before {
    left: -1.5rem;
  }

  .page-about .about-hero__actions .btn {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline .timeline__item,
  .page-about .about-asset,
  .page-about .about-step,
  .page-about .about-asset::after {
    transition-duration: .01ms !important;
  }

  .page-about .about-timeline .timeline__item:hover,
  .page-about .about-asset:hover,
  .page-about .about-asset:focus-within,
  .page-about .about-step:hover {
    transform: none;
  }
}