.page-about {
  display: block;
  background: var(--paper);
  color: var(--ink);
}

/* ---------- 通用区块 ---------- */
.page-about .pb-sec {
  padding: 3rem 0;
}
.page-about .pb-sec--tight {
  padding: 2.25rem 0;
}
.page-about .pb-sec--paper { background: var(--paper); color: var(--ink); }
.page-about .pb-sec--mist  { background: var(--mist); color: var(--ink); }
.page-about .pb-sec--ink   { background: var(--ink); color: var(--white); }
.page-about .pb-sec--deep  { background: var(--deep); color: var(--white); }

.page-about .pb-h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.65rem, 5.4vw, 2.7rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0.55rem 0 0;
  max-width: 22ch;
}
.page-about .pb-h2--narrow { max-width: 18ch; }

.page-about .prose { margin-top: 1.15rem; }
.page-about .prose p {
  margin: 0 0 1.05rem;
  font-size: 0.97rem;
  line-height: 1.8;
  color: rgba(11, 27, 43, 0.8);
}
.page-about .prose p:last-child { margin-bottom: 0; }
.page-about .pb-sec--ink .prose p,
.page-about .pb-sec--deep .prose p { color: rgba(255, 255, 255, 0.76); }

/* ---------- 首屏 ---------- */
.page-about .pb-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--deep);
  color: var(--white);
  border-bottom: var(--bd-heavy) solid var(--line);
}
.page-about .pb-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  right: -150px;
  top: -90px;
  width: 320px;
  height: 320px;
  border: var(--bd-heavy) solid rgba(55, 224, 176, 0.22);
  transform: rotate(14deg);
  pointer-events: none;
}
.page-about .pb-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  right: -70px;
  bottom: -130px;
  width: 240px;
  height: 240px;
  border: var(--bd-heavy) solid rgba(255, 107, 74, 0.16);
  pointer-events: none;
}

.page-about .pb-crumbs { padding-top: 1.5rem; }
.page-about .pb-crumbs .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.5);
}
.page-about .pb-crumbs .breadcrumbs a {
  color: rgba(255, 255, 255, 0.74);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.page-about .pb-crumbs .breadcrumbs a:hover,
.page-about .pb-crumbs .breadcrumbs a:focus-visible {
  color: var(--white);
  border-bottom-color: var(--coral);
}

.page-about .pb-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  padding: 1.4rem 0 2.25rem;
}
.page-about .pb-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.05rem, 8.6vw, 4rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin: 0.5rem 0 0;
  max-width: 16ch;
}
.page-about .pb-hero__lede {
  margin: 1.15rem 0 0;
  max-width: 46ch;
  font-size: 0.98rem;
  line-height: 1.82;
  color: rgba(255, 255, 255, 0.78);
}
.page-about .pb-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.7rem;
}

.page-about .pb-hero__aside {
  border-top: var(--bd) solid var(--line);
  padding-top: 1.25rem;
}
.page-about .pb-aside-label {
  margin: 0 0 0.85rem;
  font-family: var(--font-label);
  font-weight: 700;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--mint);
}
.page-about .pb-jump {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .pb-jump a {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding: 0.55rem 0.4rem 0.55rem 0;
  font-size: 0.92rem;
  color: rgba(255, 255, 255, 0.76);
  text-decoration: none;
  border-bottom: 1px dashed rgba(44, 74, 110, 0.9);
  transition: color 0.2s ease, padding-left 0.2s ease;
}
.page-about .pb-jump a:hover,
.page-about .pb-jump a:focus-visible {
  color: var(--white);
  padding-left: 0.55rem;
}
.page-about .pb-jump__num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--coral);
  flex: 0 0 auto;
}

.page-about .pb-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: var(--bd) solid var(--line);
  background: rgba(255, 255, 255, 0.03);
}
.page-about .pb-stat {
  padding: 1rem clamp(0.9rem, 4vw, 2.2rem) 1.1rem;
  border-right: var(--bd) solid var(--line);
  border-bottom: var(--bd) solid var(--line);
}
.page-about .pb-stat__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.45rem, 5.5vw, 2rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--mint);
}
.page-about .pb-stat:first-child .pb-stat__num { color: var(--coral); }
.page-about .pb-stat__label {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.78rem;
  line-height: 1.55;
  color: rgba(255, 255, 255, 0.64);
}

/* ---------- 图片基座 ---------- */
.page-about .pb-figure {
  margin: 0;
  background: var(--paper-light);
  border: var(--bd-heavy) solid var(--ink);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}
.page-about .pb-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .pb-figure--origin img { aspect-ratio: 16 / 9; }
.page-about .pb-figure--scale img  { aspect-ratio: 3 / 2; }
.page-about .pb-figure--device img { aspect-ratio: 4 / 3; }
.page-about .pb-figure figcaption {
  padding: 0.7rem 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  line-height: 1.5;
  color: rgba(11, 27, 43, 0.7);
  background: var(--paper-light);
  border-top: var(--bd) solid var(--ink);
}

/* ---------- 展览标签 ---------- */
.page-about .pb-marks {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 1.5rem 0 0;
  padding: 0;
}
.page-about .pb-marks li {
  padding: 0.42rem 0.78rem;
  font-family: var(--font-label);
  font-weight: 700;
  font-size: 0.74rem;
  letter-spacing: 0.09em;
  color: var(--ink);
  background: var(--paper-light);
  border: var(--bd) solid var(--ink);
}

/* ---------- 品牌起源 ---------- */
.page-about .pb-origin__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.25rem;
}

/* ---------- 三端体系 ---------- */
.page-about .pb-tri__top {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}
.page-about .pb-scan {
  margin-top: 1.6rem;
  padding: 1.25rem 1.2rem 1.4rem;
  background: var(--deep);
  color: var(--white);
  border: var(--bd-heavy) solid var(--ink);
  box-shadow: var(--shadow-hard);
}
.page-about .pb-scan__title {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.12rem;
  letter-spacing: -0.01em;
  color: var(--mint);
}
.page-about .pb-scan__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: rgba(255, 255, 255, 0.76);
}

.page-about .pb-tri__cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: 2.25rem;
}
.page-about .pb-card {
  padding: 1.15rem 1.1rem 1.35rem;
  background: var(--paper-light);
  border: var(--bd) solid var(--ink);
  box-shadow: 4px 4px 0 var(--line);
}
.page-about .pb-card__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--coral);
}
.page-about .pb-card h3 {
  margin: 0.45rem 0 0.5rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.14rem;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.page-about .pb-card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: rgba(11, 27, 43, 0.78);
}

/* ---------- 发展历程时间轴 ---------- */
.page-about .pb-tl {
  position: relative;
  list-style: none;
  margin: 2.5rem 0 0;
  padding: 0;
}
.page-about .pb-tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 0.55rem;
  bottom: 0.55rem;
  width: var(--bd);
  background: linear-gradient(180deg, var(--coral) 0%, var(--line) 38%, rgba(44, 74, 110, 0.25) 100%);
}
.page-about .pb-tl__item {
  position: relative;
  padding: 0 0 1.9rem 1.9rem;
  transition: transform 0.25s ease;
}
.page-about .pb-tl__item:last-child { padding-bottom: 0; }
.page-about .pb-tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.42rem;
  width: 12px;
  height: 12px;
  background: var(--mint);
  border: 2px solid var(--deep);
  transform: rotate(45deg);
  transition: background 0.22s ease, transform 0.22s ease;
}
.page-about .pb-tl__when {
  margin: 0 0 0.3rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--amber);
}
.page-about .pb-tl__title {
  margin: 0 0 0.45rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.14rem;
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--white);
}
.page-about .pb-tl__text {
  margin: 0;
  max-width: 52ch;
  font-size: 0.92rem;
  line-height: 1.78;
  color: rgba(255, 255, 255, 0.72);
}

/* ---------- 服务规模 ---------- */
.page-about .pb-scale__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.25rem;
}
.page-about .pb-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 1.7rem;
  border: var(--bd) solid var(--ink);
  background: var(--paper-light);
}
.page-about .pb-metric {
  padding: 1rem 0.95rem 1.15rem;
  border-right: var(--bd) solid var(--ink);
  border-bottom: var(--bd) solid var(--ink);
}
.page-about .pb-metric:nth-child(2n) { border-right: 0; }
.page-about .pb-metric:nth-last-child(-n + 2) { border-bottom: 0; }
.page-about .pb-metric__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.35rem, 5vw, 1.8rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--coral);
}
.page-about .pb-metric__label {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.78rem;
  line-height: 1.55;
  color: rgba(11, 27, 43, 0.72);
}

/* ---------- 内容共建 ---------- */
.page-about .pb-eco__head .prose { max-width: 62ch; }
.page-about .pb-eco__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: 2rem;
}
.page-about .pb-eco__card {
  padding: 1.2rem 1.1rem 1.35rem;
  background: var(--paper-light);
  border: var(--bd) solid var(--ink);
  box-shadow: 4px 4px 0 var(--line);
}
.page-about .pb-eco__card--lead {
  background: var(--deep);
  color: var(--white);
  border-color: var(--ink);
}
.page-about .pb-eco__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.6rem, 6vw, 2.2rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--mint);
}
.page-about .pb-eco__card:not(.pb-eco__card--lead) .pb-eco__num { color: var(--coral); }
.page-about .pb-eco__card h3 {
  margin: 0.5rem 0 0.45rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.08rem;
  letter-spacing: -0.01em;
}
.page-about .pb-eco__card p {
  margin: 0;
  font-size: 0.89rem;
  line-height: 1.72;
}
.page-about .pb-eco__card:not(.pb-eco__card--lead) p { color: rgba(11, 27, 43, 0.78); }
.page-about .pb-eco__card--lead p { color: rgba(255, 255, 255, 0.76); }

/* ---------- 资质与认可 ---------- */
.page-about .pb-cred__inner { max-width: 100%; }
.page-about .pb-cred__prose { max-width: 64ch; }

/* ---------- 收尾 ---------- */
.page-about .pb-close__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}
.page-about .pb-close__lede {
  margin: 1.1rem 0 0;
  max-width: 48ch;
  font-size: 0.95rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.76);
}
.page-about .pb-close__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.6rem;
}
.page-about .pb-close__contact {
  padding: 1.25rem 1.2rem 1.35rem;
  border: var(--bd-heavy) solid var(--line);
  background: rgba(255, 255, 255, 0.04);
}
.page-about .pb-close__contact-label {
  margin: 0 0 0.4rem;
  font-family: var(--font-label);
  font-weight: 700;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--amber);
}
.page-about .pb-close__mail {
  margin: 0 0 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--white);
  word-break: break-all;
}
.page-about .pb-close__note {
  margin: 0.85rem 0 0;
  font-size: 0.8rem;
  line-height: 1.68;
  color: rgba(255, 255, 255, 0.6);
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-about .pb-tri__cards { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (min-width: 760px) {
  .page-about .pb-hero__stats { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .page-about .pb-eco__grid { grid-template-columns: 1.5fr 1fr 1fr; }
  .page-about .pb-metric:nth-child(2n) { border-right: var(--bd) solid var(--ink); }
  .page-about .pb-metric:nth-last-child(-n + 2) { border-bottom: var(--bd) solid var(--ink); }
  .page-about .pb-metric:nth-child(4n) { border-right: 0; }
  .page-about .pb-metric:nth-last-child(-n + 4) { border-bottom: 0; }
}

@media (min-width: 900px) {
  .page-about .pb-sec { padding: 4.75rem 0; }
  .page-about .pb-sec--tight { padding: 3.25rem 0; }

  .page-about .pb-hero__grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, 0.82fr);
    align-items: end;
    gap: 3.5rem;
    padding: 2.4rem 0 3.4rem;
  }
  .page-about .pb-hero__aside {
    border-top: 0;
    border-left: var(--bd) solid var(--line);
    padding: 0.25rem 0 0.25rem 1.9rem;
  }
  .page-about .pb-hero__lede { font-size: 1.05rem; }

  .page-about .pb-origin__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    align-items: center;
    gap: 3.5rem;
  }

  .page-about .pb-tri__top {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.84fr);
    align-items: start;
    gap: 3rem;
  }
  .page-about .pb-tri__cards { margin-top: 2.75rem; gap: 1.25rem; }

  .page-about .pb-tl { margin-top: 3rem; }
  .page-about .pb-tl__item { padding-left: 2.4rem; padding-bottom: 2.4rem; }
  .page-about .pb-tl__item::before { left: 0.05rem; top: 0.5rem; }
  .page-about .pb-tl__title { font-size: 1.28rem; }
  .page-about .pb-tl__text { font-size: 0.95rem; }

  .page-about .pb-scale__grid {
    grid-template-columns: minmax(0, 0.94fr) minmax(0, 1.06fr);
    align-items: center;
    gap: 3.5rem;
  }

  .page-about .pb-eco__grid { margin-top: 2.5rem; gap: 1.25rem; }
  .page-about .pb-eco__card--lead { padding: 1.6rem 1.5rem 1.75rem; }

  .page-about .pb-close__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
    align-items: start;
    gap: 3.5rem;
  }
}

@media (hover: hover) and (min-width: 900px) {
  .page-about .pb-tl__item:hover { transform: translateX(6px); }
  .page-about .pb-tl__item:hover::before { background: var(--coral); transform: rotate(45deg) scale(1.18); }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .pb-tl__item,
  .page-about .pb-tl__item::before,
  .page-about .pb-jump a,
  .page-about .pb-crumbs .breadcrumbs a {
    transition: none;
  }
  .page-about .pb-tl__item:hover { transform: none; }
}