.page-about {
  background: var(--ink-900);
  color: var(--paper-100);
  overflow-x: hidden;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + 60px) 0 0;
  background:
    radial-gradient(90% 72% at 84% 0%, rgba(201, 162, 39, 0.16), transparent 62%),
    linear-gradient(180deg, var(--ink-800) 0%, var(--ink-900) 100%);
  border-bottom: 1px solid var(--line-soft);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(217, 211, 198, 0.055) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(217, 211, 198, 0.055) 1px, transparent 1px);
  background-size: 72px 72px;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.65), transparent 72%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.65), transparent 72%);
}

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

.page-about .hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  padding-top: 18px;
}

.page-about .hero-title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(34px, 8.4vw, 74px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: 0.012em;
  color: var(--paper-100);
  text-wrap: balance;
}

.page-about .hero-lede {
  max-width: 42em;
  margin: 20px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper-300);
}

.page-about .hero-mark {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
  padding: 16px 0 18px;
  border-top: 1px solid var(--line-gold);
}

.page-about .hero-mark-num {
  font-family: var(--font-mono);
  font-size: clamp(60px, 19vw, 148px);
  font-weight: 700;
  line-height: 0.84;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  color: var(--gold-500);
}

.page-about .hero-mark-rule {
  display: block;
  width: 100%;
  max-width: 260px;
  height: 6px;
  background-image: repeating-linear-gradient(
    to right,
    var(--line-strong) 0 1px,
    transparent 1px 10px
  );
}

.page-about .hero-mark-label {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--steel-400);
}

.page-about .hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line-soft);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .hero-facts li {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 14px 22px;
  background: var(--ink-900);
}

.page-about .fact-line {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.page-about .fact-num {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--gold-500);
}

.page-about .fact-unit {
  font-size: 13px;
  color: var(--steel-400);
}

.page-about .fact-label {
  font-size: 13px;
  line-height: 1.65;
  color: var(--paper-300);
}

/* ============ 品牌起点 ============ */
.page-about .about-origin {
  background: var(--ink-900);
}

.page-about .origin-grid {
  row-gap: 40px;
}

.page-about .origin-p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper-300);
}

.page-about .origin-p:last-of-type {
  margin-bottom: 26px;
}

.page-about .origin-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0;
}

.page-about .origin-figure {
  margin: 0 0 18px;
}

.page-about .origin-note {
  padding: 18px 18px 20px;
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--copper-600);
  background: var(--ink-800);
}

.page-about .origin-note p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--paper-300);
}

.page-about .origin-note-k {
  margin-bottom: 8px !important;
  font-family: var(--font-mono);
  font-size: 12px !important;
  letter-spacing: 0.16em;
  color: var(--copper-600) !important;
}

/* ============ 时间线 ============ */
.page-about .about-timeline {
  background: var(--paper-100);
  color: var(--ink-on-paper);
  background-image:
    linear-gradient(to right, rgba(10, 18, 28, 0.045) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(10, 18, 28, 0.045) 1px, transparent 1px);
  background-size: 72px 72px;
}

.page-about .about-timeline .section-title,
.page-about .about-timeline .section-desc {
  color: var(--ink-on-paper);
}

.page-about .about-timeline .section-desc {
  color: var(--muted-on-paper);
}

.page-about .timeline-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin-top: 34px;
}

.page-about .tl-rail {
  display: none;
}

.page-about .tl-list {
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
  border-left: 1px solid rgba(10, 18, 28, 0.16);
}

.page-about .tl-item {
  position: relative;
  padding-bottom: 26px;
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 26px;
  width: 9px;
  height: 9px;
  background: var(--paper-100);
  border: 1px solid var(--gold-500);
  transform: rotate(45deg);
  transition: background var(--ease), border-color var(--ease);
}

.page-about .tl-item[data-active="true"]::before {
  background: var(--gold-500);
  border-color: var(--gold-500);
}

.page-about .tl-card {
  padding: 20px 18px 22px;
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid rgba(10, 18, 28, 0.12);
  transition: border-color var(--ease), transform var(--ease);
}

.page-about .tl-card:hover {
  border-color: var(--gold-500);
}

.page-about .tl-year {
  display: inline-block;
  margin: 0 0 10px;
  padding-left: 10px;
  border-left: 3px solid var(--gold-500);
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--ink-on-paper);
}

.page-about .tl-title {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink-on-paper);
}

.page-about .tl-desc {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.82;
  color: var(--muted-on-paper);
}

.page-about .tl-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .tl-focus {
  margin: 38px 0 0;
}

.page-about .tl-focus-frame {
  max-width: 560px;
  margin: 0 auto;
}

.page-about .about-timeline .figcaption {
  max-width: 560px;
  margin: 12px auto 0;
  text-align: center;
  color: var(--muted-on-paper);
}

/* ============ 团队与网点 ============ */
.page-about .about-team {
  background: var(--ink-800);
}

.page-about .stat-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 32px 0 40px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .stat {
  padding: 22px 16px 24px;
  background: var(--ink-900);
}

.page-about .stat-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(38px, 10vw, 56px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--gold-500);
}

.page-about .stat-unit {
  margin: 6px 0 0;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--steel-400);
}

.page-about .stat-label {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--paper-300);
}

.page-about .team-grid {
  row-gap: 34px;
  align-items: start;
}

.page-about .team-media .figure {
  margin: 0;
}

.page-about .team-p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper-300);
}

.page-about .inline-link {
  color: var(--gold-300);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
  transition: color var(--ease);
}

.page-about .inline-link:hover {
  color: var(--gold-500);
}

/* ============ 安装与验收 ============ */
.page-about .about-install {
  background: var(--paper-100);
  color: var(--ink-on-paper);
}

.page-about .about-install .section-title {
  color: var(--ink-on-paper);
}

.page-about .about-install .section-desc {
  color: var(--muted-on-paper);
}

.page-about .steps {
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid rgba(10, 18, 28, 0.16);
}

.page-about .step {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 16px;
  padding: 22px 0;
  border-bottom: 1px solid rgba(10, 18, 28, 0.12);
}

.page-about .step-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
  color: var(--gold-500);
}

.page-about .step-title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink-on-paper);
}

.page-about .step-desc {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.82;
  color: var(--muted-on-paper);
}

.page-about .step-out {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--copper-600);
  border-left: 2px solid var(--copper-600);
  padding-left: 10px;
}

/* ============ 质保与巡检 ============ */
.page-about .about-warranty {
  background: var(--ink-900);
}

.page-about .warranty-grid {
  row-gap: 30px;
}

.page-about .warranty-col {
  padding: 24px 20px 26px;
  border: 1px solid var(--line-soft);
  background: var(--ink-800);
}

.page-about .warranty-title {
  margin: 0 0 18px;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper-100);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-gold);
}

.page-about .warranty-list {
  margin: 0 0 18px;
  padding: 0;
}

.page-about .warranty-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px dashed var(--line-soft);
}

.page-about .warranty-row dt {
  font-size: 15px;
  color: var(--paper-300);
}

.page-about .warranty-row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--gold-500);
}

.page-about .warranty-intro {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--paper-300);
}

.page-about .check-list {
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
}

.page-about .check-list li {
  position: relative;
  padding: 10px 0 10px 22px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--paper-300);
  border-bottom: 1px dashed var(--line-soft);
}

.page-about .check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 19px;
  width: 10px;
  height: 1px;
  background: var(--gold-500);
}

.page-about .warranty-note {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--steel-400);
}

/* ============ 渠道与工程合作 ============ */
.page-about .about-channel {
  background: var(--paper-100);
  color: var(--ink-on-paper);
}

.page-about .about-channel .section-title {
  color: var(--ink-on-paper);
}

.page-about .channel-grid {
  row-gap: 34px;
}

.page-about .channel-p {
  margin: 0 0 24px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted-on-paper);
}

.page-about .channel-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .channel-item {
  padding: 20px 0;
  border-top: 1px solid rgba(10, 18, 28, 0.14);
}

.page-about .channel-item:last-child {
  border-bottom: 1px solid rgba(10, 18, 28, 0.14);
}

.page-about .channel-item h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink-on-paper);
}

.page-about .channel-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--muted-on-paper);
}

.page-about .channel-aside {
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.page-about .aside-card {
  padding: 24px 20px 26px;
  background: var(--ink-800);
  border: 1px solid var(--ink-700);
  border-top: 3px solid var(--gold-500);
}

.page-about .aside-k {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold-500);
}

.page-about .aside-title {
  margin: 0 0 12px;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper-100);
}

.page-about .aside-p {
  margin: 0 0 20px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--paper-300);
}

.page-about .aside-card .btn {
  display: block;
  width: 100%;
  margin-bottom: 10px;
  text-align: center;
}

.page-about .aside-card .btn:last-child {
  margin-bottom: 0;
}

.page-about .aside-facts {
  padding: 18px 20px 20px;
  border: 1px solid rgba(10, 18, 28, 0.16);
  background: rgba(255, 255, 255, 0.62);
}

.page-about .aside-facts p {
  margin: 0;
  color: var(--ink-on-paper);
}

.page-about .aside-num {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--copper-600);
}

.page-about .aside-fact-label {
  margin-top: 6px !important;
  margin-bottom: 16px !important;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted-on-paper) !important;
}

.page-about .aside-facts p:last-child {
  margin-bottom: 0 !important;
}

/* ============ 延伸入口 ============ */
.page-about .about-next {
  background: var(--ink-900);
  border-top: 1px solid var(--line-soft);
}

.page-about .next-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .next-card {
  display: block;
  padding: 26px 20px 30px;
  background: var(--ink-900);
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: background var(--ease), border-color var(--ease);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  background: var(--ink-800);
  border-left-color: var(--gold-500);
}

.page-about .next-kicker {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--gold-500);
}

.page-about .next-title {
  margin: 0 0 10px;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper-100);
}

.page-about .next-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--paper-300);
}

/* ============ 响应式 ============ */
@media (min-width: 640px) {
  .page-about .hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: calc(var(--header-h) + 78px);
  }

  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: end;
    gap: 56px;
    padding-top: 30px;
  }

  .page-about .hero-lede {
    font-size: 18px;
  }

  .page-about .origin-grid {
    column-gap: 48px;
  }

  .page-about .timeline-layout {
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 40px;
  }

  .page-about .tl-rail {
    display: block;
    align-self: start;
    position: sticky;
    top: calc(var(--header-h) + 32px);
    padding: 0;
    border-left: 1px solid rgba(10, 18, 28, 0.16);
  }

  .page-about .tl-rail .index-link {
    display: block;
    padding: 9px 0 9px 14px;
    text-decoration: none;
    border-left: 2px solid transparent;
    margin-left: -1px;
    transition: border-color var(--ease);
  }

  .page-about .tl-rail .index-code {
    font-family: var(--font-mono);
    font-size: 14px;
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.06em;
    color: var(--muted-on-paper);
    transition: color var(--ease);
  }

  .page-about .tl-rail .index-link:hover .index-code,
  .page-about .tl-rail .index-link[data-active="true"] .index-code {
    color: var(--gold-500);
  }

  .page-about .tl-rail .index-link[data-active="true"] {
    border-left-color: var(--gold-500);
  }

  .page-about .tl-list {
    padding-left: 30px;
  }

  .page-about .tl-item::before {
    left: -35px;
  }

  .page-about .tl-card {
    padding: 26px 26px 28px;
  }

  .page-about .tl-focus {
    margin-top: 52px;
  }

  .page-about .steps {
    margin-top: 44px;
  }

  .page-about .step {
    grid-template-columns: 78px minmax(0, 1fr);
    gap: 24px;
    padding: 28px 0;
  }

  .page-about .step-num {
    font-size: 28px;
  }

  .page-about .warranty-grid {
    column-gap: 32px;
  }

  .page-about .channel-grid {
    column-gap: 48px;
  }

  .page-about .next-card {
    padding: 34px 28px 38px;
  }
}
<<<END>>>