.page-about {
  --about-card: #FFFFFF;
  --about-rail-top: 112px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  padding: 26px 0 52px;
  background: linear-gradient(168deg, var(--deep) 0%, var(--deep) 60%, var(--deep-2) 60.2%, var(--deep-2) 100%);
  color: var(--porcelain);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--gold) 0%, rgba(212, 175, 55, 0.06) 78%, transparent 100%);
  z-index: 2;
}

.page-about .about-hero__grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, rgba(247, 244, 239, 0.055) 0 1px, transparent 1px 84px),
    repeating-linear-gradient(0deg, rgba(247, 244, 239, 0.055) 0 1px, transparent 1px 84px);
  -webkit-mask-image: linear-gradient(118deg, transparent 30%, #000 100%);
  mask-image: linear-gradient(118deg, transparent 30%, #000 100%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 3;
}

.page-about .about-crumb {
  margin-bottom: 26px;
}

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

.page-about .about-crumb .breadcrumb__item {
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
}

.page-about .about-crumb .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: rgba(212, 175, 55, 0.6);
}

.page-about .about-crumb .breadcrumb__item[aria-current="page"] {
  color: var(--gold-soft);
}

.page-about .about-crumb a {
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease);
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--gold-soft);
  border-bottom-color: var(--gold-soft);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.85rem, 6vw, 4rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 12px 0 22px;
  max-width: 20ch;
}

.page-about .about-hero__lead {
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  line-height: 1.85;
  color: var(--ink-soft);
  margin: 0 0 28px;
  max-width: 60ch;
}

.page-about .about-hero__points {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__points .tag {
  font-size: 13px;
  letter-spacing: 0.04em;
  padding: 6px 12px;
  border: 1px solid var(--line-on-dark);
  color: var(--ink-soft);
  background: rgba(247, 244, 239, 0.04);
}

.page-about .about-hero__points .tag--gold {
  border-color: var(--line-gold);
  color: var(--gold-soft);
}

/* ---------- 主体骨架 ---------- */

.page-about .about-body {
  background: var(--porcelain);
  padding-top: 44px;
  padding-bottom: 56px;
}

.page-about .about-body__grid {
  display: grid;
  gap: 44px;
}

.page-about .about-rail {
  display: flex;
  flex-direction: column;
  gap: 26px;
}

.page-about .about-rail .eyebrow {
  margin: 0;
}

.page-about .about-rail__statement {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.25rem, 3.4vw, 1.65rem);
  line-height: 1.5;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 10px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--red);
}

.page-about .about-rail__copy {
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--slate);
  font-weight: 500;
  margin: 0;
}

.page-about .about-rail__toc {
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

.page-about .about-rail__toc .toc__title {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--slate);
  margin: 0 0 10px;
}

.page-about .about-rail__toc .toc__list {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-rail__toc .toc__link {
  display: block;
  padding: 8px 10px;
  font-size: 14.5px;
  color: var(--ink);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease), background var(--t) var(--ease);
}

.page-about .about-rail__toc .toc__link:hover,
.page-about .about-rail__toc .toc__link:focus-visible {
  background: var(--sand);
  border-left-color: var(--gold);
}

.page-about .about-rail__toc .toc__link[aria-current="true"] {
  color: var(--red);
  border-left-color: var(--red);
  background: var(--sand);
}

.page-about .about-rail__figure {
  margin: 0;
  aspect-ratio: 14 / 9;
  overflow: hidden;
  position: relative;
  background: var(--sand);
}

.page-about .about-rail__figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: saturate(0.82) contrast(1.02) brightness(1.02);
}

/* ---------- 右侧主列区块 ---------- */

.page-about .about-main {
  display: flex;
  flex-direction: column;
  gap: 56px;
  min-width: 0;
}

.page-about .about-block {
  scroll-margin-top: 120px;
}

.page-about .about-block .exhibit-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--slate);
  margin: 0 0 12px;
}

.page-about .about-block .exhibit-tag__num {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--gold);
}

.page-about .about-block .section-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.4rem, 3.6vw, 2.1rem);
  line-height: 1.3;
  letter-spacing: -0.015em;
  color: var(--ink);
  margin: 0 0 14px;
}

.page-about .about-block__lead {
  font-size: 16px;
  line-height: 1.85;
  color: var(--slate);
  font-weight: 500;
  margin: 0 0 30px;
  max-width: 64ch;
}

.page-about .about-block__note {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
  margin: 26px 0 0;
  padding: 16px 18px;
  background: var(--sand);
  border-left: 2px solid var(--gold);
}

/* ---------- 时间轴 ---------- */

.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 2px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--line-strong);
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 34px 36px;
  transition: transform var(--t) var(--ease);
}

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

.page-about .timeline__node {
  position: absolute;
  left: 2px;
  top: 6px;
  width: 11px;
  height: 11px;
  background: var(--gold);
  border: 1px solid var(--deep);
  transform: rotate(45deg);
  transition: background var(--t) var(--ease), transform var(--t) var(--ease);
}

.page-about .timeline__item:hover .timeline__node,
.page-about .timeline__item:focus-within .timeline__node {
  background: var(--red);
  transform: rotate(45deg) scale(1.28);
}

.page-about .timeline__item:hover {
  transform: translateX(2px);
}

.page-about .timeline__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--mist);
  margin: 0 0 6px;
}

.page-about .timeline__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  line-height: 1.4;
  color: var(--ink);
  margin: 0 0 8px;
}

.page-about .timeline__text {
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--slate);
  margin: 0;
  max-width: 62ch;
}

/* ---------- 服务网络 ---------- */

.page-about .net-grid {
  display: grid;
  gap: 14px;
  margin-bottom: 30px;
}

.page-about .net-card {
  background: var(--about-card);
  border: 1px solid var(--line);
  border-top: 2px solid var(--line-strong);
  padding: 22px 20px 24px;
  transition: border-color var(--t) var(--ease), background var(--t) var(--ease), transform var(--t) var(--ease);
}

.page-about .net-card:hover {
  border-top-color: var(--gold);
  background: #FFFCF6;
  transform: translateY(-3px);
}

.page-about .net-card__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2rem, 5.5vw, 2.6rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--red);
  margin: 0 0 10px;
}

.page-about .net-card__title {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.55;
  color: var(--ink);
  margin: 0 0 8px;
}

.page-about .net-card__text {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--slate);
  margin: 0;
}

.page-about .about-net-figure {
  margin: 0;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  position: relative;
  background: var(--deep-2);
}

.page-about .about-net-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: saturate(0.7) contrast(1.05) brightness(0.98);
}

/* ---------- 数字统计带 ---------- */

.page-about .about-band {
  background: linear-gradient(120deg, var(--deep) 0%, var(--deep) 55%, var(--deep-2) 55.4%, var(--deep-2) 100%);
  padding: 34px 24px;
  margin: 0 -24px;
  border-top: 1px solid var(--line-gold);
  border-bottom: 1px solid var(--line-gold);
}

.page-about .about-band__inner {
  display: grid;
  gap: 26px 18px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  max-width: var(--max);
  margin: 0 auto;
}

.page-about .about-band__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.6rem, 5vw, 2.3rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold-soft);
  margin: 0 0 8px;
}

.page-about .about-band__label {
  font-size: 13.5px;
  line-height: 1.6;
  letter-spacing: 0.03em;
  color: var(--ink-soft);
  margin: 0;
}

/* ---------- 师傅认证 ---------- */

.page-about .step-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .step-item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 14px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
  transition: background var(--t) var(--ease);
}

.page-about .step-item:hover {
  background: rgba(212, 175, 55, 0.07);
}

.page-about .step-item__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.4rem;
  line-height: 1;
  color: var(--deep);
  margin: 4px 0 0;
}

.page-about .step-item__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.12rem;
  line-height: 1.4;
  color: var(--ink);
  margin: 0 0 8px;
}

.page-about .step-item__text {
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--slate);
  margin: 0;
  max-width: 62ch;
}

.page-about .about-master-figure {
  margin: 30px 0 0;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  position: relative;
  background: var(--sand);
}

.page-about .about-master-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: saturate(0.8) contrast(1.03) brightness(1.02);
}

/* ---------- 质保 ---------- */

.page-about .warranty-grid {
  display: grid;
  gap: 14px;
}

.page-about .warranty-card {
  background: var(--about-card);
  border: 1px solid var(--line);
  border-top: 2px solid var(--gold-soft);
  padding: 22px 20px 24px;
  transition: border-color var(--t) var(--ease), background var(--t) var(--ease), transform var(--t) var(--ease);
}

.page-about .warranty-card:hover {
  border-top-color: var(--gold);
  background: #FFFCF5;
  transform: translateY(-3px);
}

.page-about .warranty-card__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.6rem, 4.5vw, 2rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 0 0 10px;
}

.page-about .warranty-card__title {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.55;
  color: var(--ink);
  margin: 0 0 8px;
}

.page-about .warranty-card__text {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--slate);
  margin: 0;
}

/* ---------- 收尾 ---------- */

.page-about .about-next {
  background: var(--sand);
  padding: 42px 0 52px;
  border-top: 1px solid var(--line);
}

.page-about .about-next__inner {
  display: grid;
  gap: 26px;
}

.page-about .about-next__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.3rem, 3.4vw, 1.85rem);
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 0 0 12px;
}

.page-about .about-next__text {
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--ink);
  margin: 0;
  max-width: 66ch;
}

.page-about .about-next__text a {
  color: var(--red-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--line-gold);
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease);
}

.page-about .about-next__text a:hover,
.page-about .about-next__text a:focus-visible {
  color: var(--red);
  border-bottom-color: var(--red);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: flex-start;
}

.page-about .about-next__actions .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  font-size: 15px;
  text-decoration: none;
  border-radius: 1px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-hero {
    padding: 34px 0 68px;
  }

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

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

  .page-about .about-band {
    padding: 40px 24px;
  }

  .page-about .about-body {
    padding-top: 58px;
    padding-bottom: 72px;
  }
}

@media (min-width: 900px) {
  .page-about .about-band__inner {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
    gap: 40px;
  }

  .page-about .about-next__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: 56px;
  }

  .page-about .about-rail {
    position: sticky;
    top: var(--about-rail-top);
    align-self: start;
    gap: 24px;
  }

  .page-about .about-main {
    gap: 72px;
  }

  .page-about .about-block .section-title {
    max-width: 24ch;
  }

  .page-about .about-band {
    margin: 0;
    padding: 44px 34px;
  }
}

@media (min-width: 1280px) {
  .page-about .about-rail__copy {
    font-size: 16px;
  }

  .page-about .timeline__text,
  .page-about .step-item__text,
  .page-about .about-block__lead {
    font-size: 16.5px;
  }
}
<<<END>>>