.page-about {
  padding-block: clamp(1.25rem, 3vw, 2.5rem) clamp(3rem, 6vw, 5rem);
  color: var(--snow);
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  margin-bottom: clamp(1.5rem, 4vw, 2.5rem);
  font-size: .86rem;
  color: var(--mist);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  margin-bottom: clamp(3rem, 8vw, 5.5rem);
}

@media (min-width: 940px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    align-items: center;
  }
}

.page-about .hero-eyebrow {
  margin: 0 0 .9rem;
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .22em;
  color: var(--amber);
}

.page-about .about-hero h1 {
  margin: 0;
  font-size: clamp(1.85rem, 5.4vw, 3.35rem);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.03em;
  color: var(--snow);
}

@media (min-width: 940px) {
  .page-about .about-hero h1 {
    transform: skewX(-1.5deg);
    transform-origin: left center;
    padding-inline: .06em;
  }
}

.page-about .hero-lede {
  max-width: 58ch;
  margin: 1.15rem 0 0;
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 1.75rem 0 0;
  background: var(--ridge);
  border: 1px solid var(--ridge);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

@media (min-width: 560px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .hs {
  margin: 0;
  padding: .85rem 1rem 1rem;
  background: var(--rock);
}

.page-about .hs dt {
  margin: 0 0 .35rem;
  font-size: .74rem;
  letter-spacing: .12em;
  color: var(--mist);
}

.page-about .hs-value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.1rem, 2.6vw, 1.5rem);
  letter-spacing: .01em;
  color: var(--snow);
}

.page-about .hero-media {
  position: relative;
  margin: 0;
  border: 1px solid var(--ridge);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--rock);
  box-shadow: var(--shadow-soft);
}

.page-about .hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(150deg, rgba(215, 38, 61, .2), transparent 46%, rgba(47, 191, 166, .14));
}

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

.page-about .media-caption {
  margin: 0;
  padding: .7rem 1rem .85rem;
  font-size: .8rem;
  line-height: 1.6;
  color: var(--mist);
  background: var(--rock);
  border-top: 1px solid var(--ridge);
}

/* ---------- 章节标题体系 ---------- */
.page-about .section {
  margin-block: clamp(2.75rem, 7vw, 4.75rem);
}

.page-about .sec-head {
  display: flex;
  align-items: flex-start;
  gap: clamp(.7rem, 2vw, 1.4rem);
  margin-bottom: .9rem;
}

.page-about .sec-num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: clamp(2.2rem, 6.5vw, 3.9rem);
  font-weight: 700;
  line-height: .95;
  letter-spacing: -0.02em;
  color: var(--red);
  transition: color .3s var(--ease);
}

@supports (-webkit-text-stroke: 1px red) {
  .page-about .sec-num {
    color: transparent;
    -webkit-text-stroke: 1.5px var(--red);
  }
  .page-about [data-section].is-current .sec-num {
    color: var(--red);
    -webkit-text-stroke-color: var(--red);
  }
}

.page-about .sec-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .18em;
  color: var(--teal);
}

.page-about .sec-title {
  margin: .3rem 0 0;
  font-size: clamp(1.3rem, 3.2vw, 1.95rem);
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--snow);
}

.page-about .sec-sub {
  max-width: 64ch;
  margin: 0 0 clamp(1.5rem, 4vw, 2.25rem);
  font-size: .98rem;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 纵向时间线 ---------- */
.page-about .tl {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: .7rem;
  bottom: .7rem;
  width: 1px;
  background: linear-gradient(180deg, var(--red), var(--amber) 58%, var(--teal));
  opacity: .65;
}

.page-about .tl-node {
  position: relative;
  padding: 0 0 1.75rem 1.9rem;
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62rem;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--night);
  border: 2px solid var(--ridge);
  transition: border-color .18s var(--ease), background-color .18s var(--ease);
}

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

.page-about .tl-node--now::before {
  border-color: var(--teal);
  background: var(--teal);
}

.page-about .tl-year {
  display: block;
  margin-bottom: .25rem;
  font-family: var(--font-mono);
  font-size: 1.3rem;
  letter-spacing: .02em;
  color: var(--amber);
}

.page-about .tl-node--now .tl-year {
  color: var(--teal);
}

.page-about .tl-head {
  margin: 0 0 .45rem;
  font-size: 1.06rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--snow);
}

.page-about .tl-body p {
  margin: 0;
  font-size: .96rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .tl-more > div {
  overflow: hidden;
}

.page-about .tl-more p {
  margin-top: .6rem;
  padding-left: .85rem;
  border-left: 2px solid var(--ridge);
  font-size: .9rem;
  color: var(--mist);
}

@media (hover: hover) and (prefers-reduced-motion: no-preference) {
  .page-about .tl-more {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows .4s var(--ease);
  }
  .page-about .tl-node:hover .tl-more,
  .page-about .tl-node:focus-within .tl-more {
    grid-template-rows: 1fr;
  }
}

@media (min-width: 760px) {
  .page-about .tl::before {
    left: 80px;
  }
  .page-about .tl-node {
    display: grid;
    grid-template-columns: 84px minmax(0, 1fr);
    column-gap: 2rem;
    padding: 0 0 2.3rem;
  }
  .page-about .tl-node::before {
    left: 74px;
  }
  .page-about .tl-year {
    margin-bottom: 0;
    text-align: right;
    padding-top: .1rem;
  }
}

.page-about .tl-figure {
  margin: clamp(1.5rem, 4vw, 2.5rem) auto 0;
  max-width: 500px;
  border: 1px solid var(--ridge);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--rock);
}

.page-about .tl-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  opacity: .92;
}

/* ---------- 团队构成 ---------- */
.page-about .team-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
}

@media (min-width: 900px) {
  .page-about .team-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
  }
}

.page-about .team-copy p {
  margin: 0 0 1rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--mist);
}

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

.page-about .team-meters {
  display: grid;
  gap: 1.5rem;
  padding: clamp(1.1rem, 3vw, 1.6rem);
  background: var(--rock);
  border: 1px solid var(--ridge);
  border-radius: var(--radius);
}

.page-about .meter-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: .6rem;
  font-size: .96rem;
  color: var(--snow);
}

.page-about .meter-num {
  font-size: .95rem;
  color: var(--amber);
}

.page-about .meter-track {
  position: relative;
  height: 8px;
  border-radius: 999px;
  background: var(--rock-deep);
  border: 1px solid var(--ridge);
  overflow: hidden;
}

.page-about .meter-fill {
  display: block;
  height: 100%;
  transform-origin: left center;
  border-radius: 999px;
  animation: about-meter .9s var(--ease) both;
}

.page-about .meter-fill--a {
  width: 62%;
  background: linear-gradient(90deg, var(--red-deep), var(--red));
}

.page-about .meter-fill--b {
  width: 38%;
  background: linear-gradient(90deg, #1c7f6f, var(--teal));
  animation-delay: .14s;
}

@keyframes about-meter {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

.page-about .meter-note {
  margin: .65rem 0 0;
  font-size: .86rem;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 生产流程 ---------- */
.page-about .flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 880px) {
  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1.15rem;
  }
}

.page-about .flow-step {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: .5rem;
  padding: 1.15rem 1.15rem 1.35rem;
  background: var(--rock);
  border: 1px solid var(--ridge);
  border-radius: var(--radius-sm);
  transition: border-color .18s var(--ease);
}

.page-about .flow-step:hover {
  border-color: var(--red);
}

@media (min-width: 880px) {
  .page-about .flow-step:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 2.7rem;
    right: -.72rem;
    width: .58rem;
    height: 1px;
    background: linear-gradient(90deg, var(--red), var(--amber));
  }
}

.page-about .flow-idx {
  font-size: .82rem;
  letter-spacing: .12em;
  color: var(--red);
}

.page-about .flow-name {
  margin: 0;
  font-size: 1.04rem;
  font-weight: 700;
  color: var(--snow);
}

.page-about .flow-step p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 数据合作 ---------- */
.page-about .data-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.75rem);
}

@media (min-width: 940px) {
  .page-about .data-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, .92fr);
    align-items: center;
  }
}

.page-about .data-media {
  margin: 0;
  border: 1px solid var(--ridge);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--rock);
}

.page-about .data-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
}

.page-about .data-copy p {
  margin: 0 0 1rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .data-points {
  margin: 1.4rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--ridge);
  border: 1px solid var(--ridge);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .data-points li {
  display: flex;
  align-items: baseline;
  gap: .8rem;
  padding: .7rem .9rem;
  background: var(--rock);
  font-size: .9rem;
  color: var(--mist);
}

.page-about .data-points .mono {
  flex: 0 0 auto;
  min-width: 4.6rem;
  font-size: .95rem;
  color: var(--amber);
}

/* ---------- 服务原则 ---------- */
.page-about .svc-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

@media (min-width: 800px) {
  .page-about .svc-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .svc-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: .65rem;
  padding: 1.5rem 1.3rem 1.5rem;
  background: var(--rock);
  border: 1px solid var(--ridge);
  border-radius: var(--radius);
  transition: border-color .18s var(--ease);
}

.page-about .svc-card:hover {
  border-color: var(--ridge);
}

.page-about .svc-card::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 1.3rem;
  width: 46px;
  height: 3px;
  border-radius: 0 0 3px 3px;
  background: var(--red);
}

.page-about .svc-card--amber::before {
  background: var(--amber);
}

.page-about .svc-card--teal::before {
  background: var(--teal);
}

.page-about .svc-card h3 {
  margin: 0;
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--snow);
}

.page-about .svc-card p {
  margin: 0;
  font-size: .94rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .svc-link {
  margin-top: auto;
  align-self: flex-start;
  padding-bottom: 2px;
  font-size: .9rem;
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(242, 169, 59, .38);
  transition: border-color .18s var(--ease), color .18s var(--ease);
}

.page-about .svc-link:hover {
  color: var(--snow);
  border-bottom-color: var(--snow);
}

/* ---------- 站点内导航 ---------- */
.page-about .about-next {
  padding-top: clamp(1.5rem, 4vw, 2.5rem);
  border-top: 1px solid var(--ridge);
}

.page-about .next-title {
  margin: 0 0 1.25rem;
  font-size: clamp(1.1rem, 2.6vw, 1.45rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--snow);
}

.page-about .next-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .85rem;
}

@media (min-width: 640px) {
  .page-about .next-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1000px) {
  .page-about .next-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .next-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: .45rem;
  padding: 1.15rem 1.2rem 1.5rem;
  background: var(--rock-deep);
  border: 1px solid var(--ridge);
  border-radius: var(--radius-sm);
  text-decoration: none;
  overflow: hidden;
  transition: border-color .18s var(--ease), transform .18s var(--ease);
}

.page-about .next-card::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 20px;
  height: 20px;
  background: linear-gradient(135deg, transparent 49%, var(--amber) 50%);
  opacity: .75;
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  border-color: var(--red);
  transform: translateY(-2px);
}

.page-about .next-label {
  font-size: 1rem;
  font-weight: 700;
  color: var(--snow);
}

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

/* ---------- 无动画偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .meter-fill {
    animation: none;
    transform: none;
  }
  .page-about .tl-node::before,
  .page-about .tl-more,
  .page-about .flow-step,
  .page-about .next-card,
  .page-about .sec-num {
    transition: none;
  }
  .page-about .next-card:hover,
  .page-about .next-card:focus-visible {
    transform: none;
  }
}