.page-about {
  --about-rail: 208px;
  --about-measure: 68ch;
  --about-body: rgba(244, 241, 232, 0.86);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(22px, 4vw, 42px) clamp(38px, 6vw, 82px);
  overflow: hidden;
}

.page-about .about-hero__glow {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(52% 46% at 80% 14%, rgba(95, 211, 196, 0.14), transparent 68%),
    radial-gradient(44% 40% at 6% 6%, rgba(184, 255, 60, 0.09), transparent 70%);
}

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

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(20px, 3.4vw, 38px);
  font-size: 0.82rem;
  color: var(--c-mist);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
  align-items: end;
}

.page-about .about-hero__eyebrow {
  display: inline-block;
  margin-bottom: 16px;
  padding: 4px 10px;
  border: 1px solid rgba(255, 162, 58, 0.42);
  border-radius: var(--r-sm);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--c-amber);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  max-width: 22ch;
  font-size: clamp(2rem, 6.1vw, 4.05rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--c-paper);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 56ch;
  font-size: clamp(0.95rem, 1.5vw, 1.05rem);
  line-height: 1.92;
  color: var(--about-body);
}

.page-about .about-hero__fig {
  position: relative;
  margin: 0;
  border: var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background:
    linear-gradient(150deg, rgba(95, 211, 196, 0.16), rgba(11, 32, 25, 0) 62%),
    var(--c-turf);
}

.page-about .about-hero__fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-hero__figcap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 10px 14px;
  background: linear-gradient(180deg, rgba(11, 32, 25, 0), rgba(11, 32, 25, 0.92));
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--c-paper);
}

@media (min-width: 940px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.42fr) minmax(0, 0.78fr);
  }
}

/* ---------- 主从栅格 ---------- */
.page-about .about-main {
  padding-bottom: clamp(56px, 8vw, 120px);
}

.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 46px);
  align-items: start;
}

.page-about .about-rail {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  scrollbar-width: thin;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  flex: none;
  padding: 7px 11px;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  font-size: 0.84rem;
  line-height: 1.4;
  color: var(--c-mist);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease), background-color var(--t) var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--c-paper);
  border-color: var(--c-grid);
}

.page-about .about-rail__link[aria-current] {
  color: var(--c-ink);
  background: var(--c-lime);
  border-color: var(--c-lime);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  opacity: 0.85;
}

.page-about .about-flow {
  display: grid;
  gap: clamp(42px, 6vw, 82px);
  min-width: 0;
}

@media (min-width: 1000px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(32px, 4.4vw, 58px);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 26px);
    flex-direction: column;
    gap: 4px;
    overflow: visible;
    padding: 0 0 0 16px;
    border-left: var(--line);
    scrollbar-width: none;
  }
}

/* ---------- 章节头 ---------- */
.page-about .ah {
  display: grid;
  gap: 8px;
  margin-bottom: clamp(20px, 3vw, 30px);
  padding-bottom: 14px;
  border-bottom: var(--line);
}

.page-about .ah__num {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--c-cyan);
}

.page-about .ah__title {
  margin: 0;
  font-size: clamp(1.35rem, 3.1vw, 1.95rem);
  line-height: 1.24;
  letter-spacing: -0.01em;
  font-weight: 800;
  color: var(--c-paper);
}

.page-about .ah__sub {
  margin: 0;
  max-width: var(--about-measure);
  font-size: 0.93rem;
  line-height: 1.85;
  color: var(--c-mist);
}

.page-about .about-prose p {
  margin: 0 0 1.05em;
  max-width: var(--about-measure);
  font-size: 0.96rem;
  line-height: 1.92;
  color: var(--about-body);
}

.page-about .about-prose p:last-child {
  margin-bottom: 0;
}

.page-about .about-prose a {
  color: var(--c-lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(184, 255, 60, 0.4);
  transition: border-color var(--t) var(--ease);
}

.page-about .about-prose a:hover,
.page-about .about-prose a:focus-visible {
  border-bottom-color: var(--c-lime);
}

.page-about .about-prose--tight {
  margin-top: clamp(20px, 3vw, 30px);
}

/* ---------- 时间轴 ---------- */
.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2.2vw, 20px);
}

.page-about .tl__item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  padding: clamp(18px, 2.8vw, 26px);
  border: var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(180deg, rgba(18, 53, 40, 0.72), rgba(18, 53, 40, 0.32));
  transition: border-color var(--t) var(--ease), transform var(--t) var(--ease);
}

.page-about .tl__item:hover,
.page-about .tl__item:focus-within {
  border-color: rgba(184, 255, 60, 0.55);
  transform: translateY(-2px);
}

.page-about .tl__marker {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .tl__dot {
  width: 9px;
  height: 9px;
  flex: none;
  border-radius: 50%;
  background: var(--c-lime);
  box-shadow: 0 0 0 4px rgba(184, 255, 60, 0.15);
}

.page-about .tl__stage {
  padding: 3px 8px;
  border: 1px solid rgba(255, 162, 58, 0.42);
  border-radius: var(--r-sm);
  font-family: var(--font-mono);
  font-size: 0.73rem;
  letter-spacing: 0.08em;
  color: var(--c-amber);
  white-space: nowrap;
}

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

.page-about .tl__title {
  margin: 0 0 8px;
  font-size: clamp(1.04rem, 2.1vw, 1.2rem);
  line-height: 1.42;
  font-weight: 750;
  color: var(--c-paper);
}

.page-about .tl__body > p {
  margin: 0;
  max-width: 62ch;
  font-size: 0.94rem;
  line-height: 1.9;
  color: var(--about-body);
}

.page-about .tl__extra {
  margin-top: 10px !important;
  padding-top: 10px;
  border-top: 1px dashed rgba(42, 74, 62, 0.95);
  font-size: 0.86rem !important;
  color: var(--c-mist) !important;
  opacity: 0.85;
  transition: opacity var(--t) var(--ease);
}

.page-about .tl__item:hover .tl__extra,
.page-about .tl__item:focus-within .tl__extra {
  opacity: 1;
}

@media (min-width: 760px) {
  .page-about .tl__item {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: clamp(18px, 2.6vw, 32px);
    align-items: start;
  }

  .page-about .tl__marker {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}

/* ---------- 数据流程带 ---------- */
.page-about .flowband {
  position: relative;
  border: var(--line);
  border-radius: var(--r-lg);
  padding: clamp(22px, 3.6vw, 44px);
  background:
    linear-gradient(180deg, rgba(95, 211, 196, 0.07), rgba(11, 32, 25, 0) 58%),
    var(--c-turf);
  overflow: hidden;
}

.page-about .flowband::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(42, 74, 62, 0.55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 74, 62, 0.55) 1px, transparent 1px);
  background-size: 88px 88px;
  opacity: 0.45;
  -webkit-mask-image: linear-gradient(158deg, #000, transparent 76%);
  mask-image: linear-gradient(158deg, #000, transparent 76%);
}

.page-about .flowband__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2.4vw, 22px);
}

.page-about .flow__step {
  position: relative;
  display: grid;
  gap: 8px;
  align-content: start;
  padding: clamp(14px, 2.2vw, 20px);
  border: var(--line);
  border-radius: var(--r-md);
  background: rgba(11, 32, 25, 0.66);
}

.page-about .flow__idx {
  font-family: var(--font-mono);
  font-size: 0.71rem;
  letter-spacing: 0.14em;
  color: var(--c-cyan);
}

.page-about .flow__name {
  margin: 0;
  font-size: 1rem;
  font-weight: 750;
  color: var(--c-paper);
}

.page-about .flow__desc {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.82;
  color: var(--about-body);
}

.page-about .flowband__fig {
  margin: 0;
  border: var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--c-ink);
}

.page-about .flowband__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .flowband__fig .media__cap {
  display: block;
  padding: 10px 14px;
  font-size: 0.79rem;
  line-height: 1.65;
  color: var(--c-mist);
  background: rgba(11, 32, 25, 0.85);
}

@media (min-width: 820px) {
  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .flow__step::after {
    content: "";
    position: absolute;
    top: 34px;
    right: -1px;
    width: 8px;
    height: 8px;
    border-top: 1px solid var(--c-cyan);
    border-right: 1px solid var(--c-cyan);
    transform: rotate(45deg) translateX(60%);
    opacity: 0.7;
  }

  .page-about .flow__step:last-child::after {
    display: none;
  }
}

/* ---------- 规模数字 ---------- */
.page-about .figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(14px, 2.6vw, 26px);
}

.page-about .fig {
  padding-top: 12px;
  border-top: 2px solid var(--c-amber);
}

.page-about .fig__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.5rem, 4.4vw, 2.3rem);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--c-amber);
}

.page-about .fig__unit {
  margin-left: 3px;
  font-size: 0.5em;
  font-weight: 600;
  color: var(--c-mist);
}

.page-about .fig__label {
  display: block;
  margin-top: 8px;
  font-size: 0.83rem;
  line-height: 1.7;
  color: var(--c-mist);
}

@media (min-width: 820px) {
  .page-about .figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 合作与资质 ---------- */
.page-about .eco {
  position: relative;
  isolation: isolate;
  border: var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--c-turf);
}

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

.page-about .eco__bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.34;
}

.page-about .eco__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(118deg, rgba(11, 32, 25, 0.94) 28%, rgba(11, 32, 25, 0.66));
}

.page-about .eco__inner {
  display: grid;
  gap: clamp(18px, 3vw, 30px);
  padding: clamp(22px, 3.8vw, 46px);
}

.page-about .eco__text {
  margin: 0;
  max-width: 62ch;
  font-size: 0.95rem;
  line-height: 1.92;
  color: var(--about-body);
}

.page-about .eco__meta {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px 22px;
  margin: 0;
  padding-top: clamp(14px, 2vw, 20px);
  border-top: var(--line);
}

.page-about .eco__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 10px;
  border-bottom: 1px dashed rgba(42, 74, 62, 0.85);
}

.page-about .eco__row:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .eco__row dt {
  flex: none;
  font-size: 0.82rem;
  color: var(--c-mist);
}

.page-about .eco__row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.88rem;
  color: var(--c-paper);
  text-align: right;
}

@media (min-width: 700px) {
  .page-about .eco__meta {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 服务通道 ---------- */
.page-about .channels {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2.4vw, 22px);
}

.page-about .chan {
  display: grid;
  align-content: start;
  gap: 10px;
  padding: clamp(18px, 2.8vw, 26px);
  border: var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(180deg, rgba(18, 53, 40, 0.72), rgba(18, 53, 40, 0.3));
  transition: border-color var(--t) var(--ease);
}

.page-about .chan:hover,
.page-about .chan:focus-within {
  border-color: rgba(184, 255, 60, 0.5);
}

.page-about .chan__title {
  margin: 0;
  font-size: 1.08rem;
  font-weight: 750;
  color: var(--c-paper);
}

.page-about .chan__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.88;
  color: var(--about-body);
}

.page-about .chan__link {
  justify-self: start;
  margin-top: 4px;
  padding-bottom: 2px;
  border-bottom: 1px solid rgba(184, 255, 60, 0.4);
  font-size: 0.88rem;
  font-weight: 650;
  color: var(--c-lime);
  text-decoration: none;
  transition: border-color var(--t) var(--ease);
}

.page-about .chan__link:hover,
.page-about .chan__link:focus-visible {
  border-bottom-color: var(--c-lime);
}

.page-about .about-cta {
  display: grid;
  gap: 14px;
  margin-top: clamp(20px, 3vw, 30px);
  padding: clamp(20px, 3vw, 30px);
  border: var(--line);
  border-radius: var(--r-md);
  background:
    radial-gradient(90% 130% at 88% 10%, rgba(184, 255, 60, 0.11), transparent 66%),
    rgba(11, 32, 25, 0.8);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 52ch;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--c-paper);
}

.page-about .about-cta .btn {
  justify-self: start;
}

@media (min-width: 780px) {
  .page-about .channels {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: clamp(18px, 3vw, 34px);
  }

  .page-about .about-cta .btn {
    justify-self: end;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .tl__item,
  .page-about .tl__extra,
  .page-about .chan,
  .page-about .about-rail__link {
    transition: none;
  }

  .page-about .tl__item:hover,
  .page-about .tl__item:focus-within {
    transform: none;
  }
}