.page-about {
  --about-sticky-top: calc(var(--header-h) + 28px);
  --about-cut: 26px;
  display: block;
  background: var(--ink-900);
  color: var(--warm-100);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + 28px) 0 clamp(44px, 6vw, 88px);
  background:
    radial-gradient(120% 90% at 12% 0%, rgba(23, 41, 79, .95) 0%, rgba(10, 20, 48, 0) 62%),
    linear-gradient(180deg, var(--ink-800) 0%, var(--ink-900) 100%);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(43, 59, 96, .55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(43, 59, 96, .55) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: .45;
  pointer-events: none;
  -webkit-mask-image: radial-gradient(ellipse at 26% 34%, #000 18%, transparent 74%);
  mask-image: radial-gradient(ellipse at 26% 34%, #000 18%, transparent 74%);
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 56px);
  align-items: end;
}

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

.page-about .about-hero__title {
  margin: 18px 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.6rem, 11vw, 5.8rem);
  line-height: .94;
  letter-spacing: -.02em;
  text-transform: none;
  color: var(--warm-100);
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--gold-500);
  position: relative;
}

.page-about .about-hero__title em::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: .08em;
  height: 4px;
  background: linear-gradient(90deg, var(--gold-500), rgba(217, 164, 65, 0));
}

.page-about .about-hero__lede {
  margin: 0 0 28px;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--slate-400);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__media {
  margin: 0;
  aspect-ratio: 4 / 5;
  border-radius: 0;
  border: 2px solid var(--line-600);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
  background: var(--ink-700);
}

.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: saturate(.9) contrast(1.05);
}

/* ---------- 外壳 ---------- */
.page-about .shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 44px);
  padding-bottom: clamp(48px, 8vw, 120px);
}

.page-about .rail {
  border: 2px solid var(--line-600);
  background: var(--ink-800);
  padding: 16px;
  box-shadow: var(--shadow-hard);
}

.page-about .rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--slate-400);
}

.page-about .rail__list {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .rail__link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 2px solid var(--line-600);
  background: var(--ink-700);
  color: var(--warm-100);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .rail__link:hover,
.page-about .rail__link:focus-visible {
  border-color: var(--gold-500);
  color: var(--gold-300);
}

.page-about .rail__link[aria-current="true"] {
  border-color: var(--gold-500);
  background: var(--ink-900);
  color: var(--gold-300);
}

.page-about .rail__num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  color: var(--celadon-400);
}

.page-about .rail__link[aria-current="true"] .rail__num {
  color: var(--gold-500);
}

/* ---------- 通用章节 ---------- */
.page-about .about-flow {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: clamp(48px, 7vw, 104px);
}

.page-about .about-sec .section-head {
  margin-bottom: clamp(24px, 3.4vw, 40px);
  max-width: 62ch;
}

.page-about .about-sec h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.7rem, 4.4vw, 2.9rem);
  line-height: 1.12;
  letter-spacing: -.015em;
  margin: 10px 0 12px;
  color: var(--warm-100);
}

.page-about .about-sec__lede {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--slate-400);
}

.page-about .about-sec a {
  color: var(--gold-300);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-sec a:hover {
  color: var(--gold-500);
}

/* ---------- 时间轴 ---------- */
.page-about .tl-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3vw, 36px);
  align-items: start;
}

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

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 10px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--line-600) 0%, var(--celadon-400) 72%, rgba(217, 164, 65, .9) 100%);
}

.page-about .tl-item {
  position: relative;
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding-bottom: clamp(20px, 3vw, 30px);
}

.page-about .tl-item__mark {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding-top: 20px;
}

.page-about .tl-item__num {
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  color: var(--slate-400);
  background: var(--ink-900);
  padding: 2px 0;
}

.page-about .tl-item__dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--celadon-400);
  box-shadow: 0 0 0 4px var(--ink-900), 0 0 0 6px rgba(111, 179, 156, .45);
}

.page-about .tl-item__dot--gold {
  background: var(--gold-500);
  box-shadow: 0 0 0 4px var(--ink-900), 0 0 0 6px rgba(217, 164, 65, .5);
}

.page-about .tl-item__body {
  background: var(--ink-800);
  border: 2px solid var(--line-600);
  box-shadow: var(--shadow-hard);
  padding: clamp(16px, 2.4vw, 24px);
}

.page-about .tl-item__body--current {
  border-color: rgba(217, 164, 65, .7);
  background: linear-gradient(160deg, var(--ink-700) 0%, var(--ink-800) 70%);
}

.page-about .tl-item__title {
  margin: 12px 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.15rem, 2.6vw, 1.5rem);
  line-height: 1.24;
  color: var(--warm-100);
}

.page-about .tl-item__body p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--slate-400);
}

.page-about .tl-item__meta {
  margin: 12px 0 0;
  padding-top: 10px;
  border-top: 1px solid var(--line-600);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--celadon-200);
}

.page-about .tl-media {
  margin: 0 0 clamp(20px, 3vw, 30px) 56px;
  border: 2px solid var(--line-600);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
  background: var(--ink-700);
}

.page-about .tl-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* 旁注卡 */
.page-about .aside-note {
  background: var(--ink-700);
  border-left: 6px solid var(--gold-500);
  padding: 20px;
}

.page-about .aside-note__k {
  margin: 0 0 2px;
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--slate-400);
}

.page-about .aside-note__v {
  margin: 0 0 14px;
  font-size: 18px;
  font-variant-numeric: tabular-nums;
  color: var(--warm-100);
  cursor: copy;
}

.page-about .aside-note__v:last-of-type {
  margin-bottom: 18px;
}

.page-about .aside-note__link {
  display: inline-block;
  font-size: 13px;
  color: var(--gold-300);
  text-decoration: none;
  border-bottom: 1px solid rgba(240, 205, 132, .5);
}

.page-about .aside-note__link:hover {
  color: var(--gold-500);
  border-bottom-color: var(--gold-500);
}

/* ---------- 产品线标签页 ---------- */
.page-about .line-tabs {
  border: 2px solid var(--line-600);
  background: var(--ink-800);
  box-shadow: var(--shadow-hard);
}

.page-about .line-tabs .tabs__list {
  display: flex;
  flex-wrap: nowrap;
  overflow-x: auto;
  border-bottom: 2px solid var(--line-600);
  background: var(--ink-900);
}

.page-about .line-tabs .tabs__tab {
  flex: 1 0 auto;
  appearance: none;
  border: 0;
  border-right: 2px solid var(--line-600);
  background: transparent;
  color: var(--slate-400);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(14px, 2.4vw, 17px);
  letter-spacing: .02em;
  padding: 16px 20px;
  cursor: pointer;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .line-tabs .tabs__tab:last-child {
  border-right: 0;
}

.page-about .line-tabs .tabs__tab:hover {
  color: var(--gold-300);
  background: var(--ink-800);
}

.page-about .line-tabs .tabs__tab[aria-selected="true"] {
  color: var(--ink-900);
  background: var(--gold-500);
}

.page-about .line-tabs .tabs__tab:focus-visible {
  outline: 2px solid var(--gold-300);
  outline-offset: -4px;
}

.page-about .line-panel {
  padding: clamp(20px, 3.4vw, 40px);
}

.page-about .line-panel__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.2rem, 3vw, 1.7rem);
  line-height: 1.2;
  color: var(--warm-100);
}

.page-about .line-panel > p {
  margin: 0 0 18px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--slate-400);
}

.page-about .line-panel__list {
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .line-panel__list li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--warm-100);
}

.page-about .line-panel__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 10px;
  height: 2px;
  background: var(--celadon-400);
}

/* ---------- 团队与覆盖（浅底反转） ---------- */
.page-about .panel-light {
  background: var(--warm-100);
  color: var(--ink-900);
  border: 2px solid var(--line-600);
  box-shadow: var(--shadow-hard);
  padding: clamp(22px, 3.6vw, 44px);
}

.page-about .stat-band {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 2.6vw, 28px);
}

.page-about .stat {
  border-left: 4px solid var(--ink-900);
  padding-left: 16px;
}

.page-about .stat__num {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2rem, 6vw, 2.9rem);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--ink-900);
  letter-spacing: -.02em;
}

.page-about .stat__unit {
  margin: 6px 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: .04em;
  color: var(--ink-700);
}

.page-about .stat__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: #3A4763;
}

.page-about .panel-light__foot {
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding-top: 18px;
  border-top: 2px solid rgba(10, 20, 48, .16);
  font-size: 15px;
  line-height: 1.85;
  color: #3A4763;
}

.page-about .panel-light__foot a {
  color: #8A5F16;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .panel-light__foot a:hover {
  color: var(--ink-900);
}

/* ---------- 资质印章 ---------- */
.page-about .stamp-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(14px, 2.4vw, 26px);
  margin: 0 0 clamp(24px, 3vw, 34px);
  padding: 0;
  list-style: none;
}

.page-about .stamp {
  position: relative;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  border: 2px solid var(--line-600);
  background: radial-gradient(circle at 30% 24%, var(--ink-700) 0%, var(--ink-900) 78%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 4px;
  padding: 14%;
  box-shadow: var(--shadow-hard);
}

.page-about .stamp::after {
  content: "";
  position: absolute;
  inset: 9%;
  border-radius: 50%;
  border: 1px dashed rgba(217, 164, 65, .42);
  pointer-events: none;
}

.page-about .stamp__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.5rem, 6vw, 2.2rem);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--gold-500);
}

.page-about .stamp__label {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(13px, 2.4vw, 15px);
  line-height: 1.3;
  color: var(--warm-100);
}

.page-about .stamp__foot {
  font-size: 10px;
  letter-spacing: .1em;
  color: var(--slate-400);
}

.page-about .cert-note {
  background: var(--ink-700);
  border-left: 6px solid var(--celadon-400);
  padding: 18px 20px;
}

.page-about .cert-note p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--slate-400);
}

/* ---------- 合作与本地服务 ---------- */
.page-about .eco {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 36px);
  align-items: start;
}

.page-about .eco__media {
  margin: 0;
  border: 2px solid var(--line-600);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
  background: var(--ink-700);
}

.page-about .eco__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 3;
  object-fit: cover;
}

.page-about .eco__body p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--slate-400);
}

.page-about .eco__list {
  margin: 0 0 16px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .eco__list li {
  position: relative;
  padding-left: 24px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--warm-100);
}

.page-about .eco__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .55em;
  width: 12px;
  height: 12px;
  border: 2px solid var(--celadon-400);
  transform: rotate(45deg);
}

.page-about .eco__meta {
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--line-600);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--celadon-200);
}

/* ---------- 延伸入口 ---------- */
.page-about .next-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2.4vw, 22px);
  margin-top: clamp(32px, 4.6vw, 56px);
}

.page-about .next-card {
  display: block;
  position: relative;
  background: var(--ink-800);
  border: 2px solid var(--line-600);
  box-shadow: var(--shadow-hard);
  padding: clamp(18px, 2.6vw, 26px);
  text-decoration: none;
  color: inherit;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  transform: translate(-3px, -3px);
  border-color: var(--gold-500);
  box-shadow: var(--shadow-gold);
}

.page-about .next-card__num {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--gold-500);
}

.page-about .next-card .card__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--warm-100);
}

.page-about .next-card .card__meta {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--slate-400);
}

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

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

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

  .page-about .tl-item {
    grid-template-columns: 84px minmax(0, 1fr);
    gap: 22px;
  }

  .page-about .tl::before {
    left: 41px;
  }

  .page-about .tl-media {
    margin-left: 106px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .9fr);
  }

  .page-about .about-hero__media {
    aspect-ratio: 4 / 5;
    max-height: 560px;
  }

  .page-about .eco {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
  }

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

@media (min-width: 1024px) {
  .page-about .shell {
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    gap: clamp(32px, 3.4vw, 56px);
  }

  .page-about .rail {
    position: sticky;
    top: var(--about-sticky-top);
    align-self: start;
  }

  .page-about .rail__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .rail__list li + li {
    margin-top: 8px;
  }

  .page-about .rail__link {
    width: 100%;
    box-sizing: border-box;
  }
}

@media (min-width: 1180px) {
  .page-about .tl-wrap {
    grid-template-columns: minmax(0, 1fr) 250px;
    gap: clamp(28px, 3vw, 48px);
  }

  .page-about .aside-sticky {
    position: sticky;
    top: var(--about-sticky-top);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .next-card,
  .page-about .rail__link,
  .page-about .line-tabs .tabs__tab {
    transition: none;
  }

  .page-about .next-card:hover,
  .page-about .next-card:focus-visible {
    transform: none;
  }
}
</final_ai_reply>