.page-about {
  --about-gap: clamp(20px, 3vw, 40px);
  --about-rail-w: 96px;
  background: var(--paper);
  color: var(--ink);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding: clamp(26px, 4vw, 56px) 0 clamp(36px, 5vw, 76px);
}

.page-about .about-hero__frame {
  position: relative;
  border: 1px solid var(--ink);
  padding: clamp(30px, 3.6vw, 54px) clamp(20px, 3vw, 48px) clamp(26px, 3.4vw, 46px);
  background:
    radial-gradient(120% 140% at 88% 0%, rgba(21, 67, 230, 0.13), transparent 58%),
    radial-gradient(90% 120% at 0% 100%, rgba(18, 160, 140, 0.1), transparent 62%),
    var(--paper);
  box-shadow: var(--shadow-paper);
  overflow: hidden;
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 9px;
  background-image: repeating-linear-gradient(90deg, var(--rule) 0 1px, transparent 1px 26px);
  pointer-events: none;
}

.page-about .about-hero__tick {
  position: absolute;
  width: 16px;
  height: 16px;
  border: 0 solid var(--blue);
  pointer-events: none;
}

.page-about .about-hero__tick:nth-of-type(1) {
  top: -1px;
  left: -1px;
  border-top-width: 2px;
  border-left-width: 2px;
}

.page-about .about-hero__tick:nth-of-type(2) {
  top: -1px;
  right: -1px;
  border-top-width: 2px;
  border-right-width: 2px;
}

.page-about .about-hero__tick:nth-of-type(3) {
  bottom: -1px;
  left: -1px;
  border-bottom-width: 2px;
  border-left-width: 2px;
}

.page-about .about-hero__tick:nth-of-type(4) {
  bottom: -1px;
  right: -1px;
  border-bottom-width: 2px;
  border-right-width: 2px;
}

.page-about .about-hero__eyebrow {
  margin: 0;
  padding-top: 8px;
  color: var(--gray);
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  max-width: 24ch;
  font-size: clamp(1.9rem, 4.6vw, 3.5rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--navy);
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 64ch;
  color: var(--ink-2);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px var(--about-gap);
  margin-top: clamp(26px, 3.4vw, 44px);
  padding-top: 22px;
  border-top: 1px solid var(--rule);
}

.page-about .about-hero__slash {
  font-size: 0.55em;
  color: var(--gray);
  padding: 0 2px;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  padding: clamp(34px, 5vw, 76px) 0;
  border-top: 1px solid var(--rule);
}

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

.page-about .about-head__idx {
  display: block;
  font-size: clamp(1.2rem, 2vw, 1.5rem);
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--blue);
  line-height: 1;
}

.page-about .about-head__kicker {
  margin: 0;
  font-size: 0.86rem;
  letter-spacing: 0.18em;
  color: var(--gray);
}

.page-about .about-head__title {
  margin: 10px 0 0;
  max-width: 26ch;
  font-size: clamp(1.45rem, 3vw, 2.35rem);
  line-height: 1.2;
  letter-spacing: -0.015em;
  font-weight: 800;
  color: var(--navy);
}

.page-about .about-head__note {
  margin: 14px 0 0;
  max-width: 66ch;
  color: var(--ink-2);
}

/* ---------- 媒体框 ---------- */
.page-about .media {
  margin: 0;
}

.page-about .about-history__figure {
  margin-top: clamp(22px, 3vw, 36px);
  padding: 8px;
  border: 1px solid var(--rule);
  background: var(--paper-2);
}

.page-about .about-history__figure img,
.page-about .about-network__figure img,
.page-about .about-cred__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 沿革时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(24px, 3vw, 40px) 0 0;
  padding: 0;
  counter-reset: about-stage;
}

.page-about .about-timeline__row {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 20px 0 20px 20px;
  border-top: 1px solid var(--rule);
  transition: background-color 0.22s var(--ease), padding-left 0.22s var(--ease);
}

.page-about .about-timeline__row::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--rule);
  transition: background-color 0.22s var(--ease);
}

.page-about .about-timeline__row:hover,
.page-about .about-timeline__row:focus-within {
  background: var(--paper-2);
}

.page-about .about-timeline__row:hover::before,
.page-about .about-timeline__row:focus-within::before {
  background: var(--blue);
}

.page-about .about-timeline__mark {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 12px;
}

.page-about .about-timeline__idx {
  font-size: 0.92rem;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .about-timeline__stage {
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--gray);
}

.page-about .about-timeline__body h3 {
  margin: 0;
  font-size: clamp(1.02rem, 1.6vw, 1.28rem);
  font-weight: 700;
  color: var(--navy);
}

.page-about .about-timeline__body p {
  margin: 8px 0 0;
  max-width: 62ch;
  color: var(--ink-2);
}

/* ---------- 网点体系 ---------- */
.page-about .about-network__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 36px);
  margin-top: clamp(22px, 3vw, 36px);
}

.page-about .about-lattice__grid {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: clamp(8px, 1.4vw, 14px);
  padding: clamp(14px, 2vw, 24px);
  background: var(--navy);
}

.page-about .about-lattice__grid span {
  display: block;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: var(--blue);
  opacity: 0.3;
}

.page-about .about-lattice__grid span:nth-child(4n + 1) {
  opacity: 1;
}

.page-about .about-lattice__grid span:nth-child(3n) {
  opacity: 0.62;
}

.page-about .about-lattice__grid span:nth-child(7n) {
  background: var(--teal);
  opacity: 0.5;
}

.page-about .about-lattice__legend {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  font-size: 0.82rem;
  color: var(--ink-2);
}

.page-about .about-lattice__dot {
  display: inline-block;
  width: 9px;
  height: 9px;
  margin-right: 7px;
  border-radius: 50%;
  vertical-align: 1px;
}

.page-about .about-lattice__dot--core {
  background: var(--blue);
}

.page-about .about-lattice__dot--auth {
  background: rgba(21, 67, 230, 0.32);
}

.page-about .about-lattice__cap {
  margin: 12px 0 0;
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--gray);
}

.page-about .about-netstats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px var(--about-gap);
  align-content: start;
}

.page-about .about-network__figure {
  margin-top: clamp(22px, 3vw, 34px);
  padding: 8px;
  border: 1px solid var(--rule);
  background: var(--paper-2);
}

.page-about .about-network__filter {
  margin-top: clamp(22px, 3vw, 34px);
  flex-wrap: wrap;
}

.page-about .about-network__count {
  font-size: 0.82rem;
  color: var(--gray);
  margin-left: auto;
}

.page-about .about-network__count b {
  font-family: var(--mono);
  color: var(--blue);
  font-weight: 600;
}

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

.page-about .about-facts__item {
  position: relative;
  padding: 16px 0 16px 22px;
  border-top: 1px solid var(--rule);
}

.page-about .about-facts__item:last-child {
  border-bottom: 1px solid var(--rule);
}

.page-about .about-facts__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 24px;
  width: 8px;
  height: 8px;
  background: var(--blue);
}

.page-about .about-facts__item[hidden] {
  display: none;
}

.page-about .about-facts__item h3 {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
}

.page-about .about-facts__item p {
  margin: 6px 0 0;
  max-width: 64ch;
  font-size: 0.95rem;
  color: var(--ink-2);
}

/* ---------- 保修三类口径 ---------- */
.page-about .about-warranty {
  margin-top: clamp(22px, 3vw, 36px);
  border-top: 2px solid var(--ink);
}

.page-about .about-warranty__head {
  display: none;
  grid-template-columns: 160px 160px minmax(0, 1fr);
  gap: var(--about-gap);
  padding: 12px 0;
  border-bottom: 1px solid var(--rule);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  color: var(--gray);
}

.page-about .about-warranty__row {
  border-bottom: 1px solid var(--rule);
}

.page-about .about-warranty__row summary {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 6px 16px;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
  align-items: baseline;
}

.page-about .about-warranty__row summary::-webkit-details-marker {
  display: none;
}

.page-about .about-warranty__row:hover summary {
  background: var(--paper-2);
}

.page-about .about-warranty__name {
  font-weight: 700;
  color: var(--navy);
}

.page-about .about-warranty__term {
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--orange);
  white-space: nowrap;
}

.page-about .about-warranty__term i {
  font-style: normal;
  font-size: 0.78rem;
  color: var(--gray);
  margin-left: 5px;
}

.page-about .about-warranty__base {
  grid-column: 1 / -1;
  font-size: 0.88rem;
  color: var(--gray);
}

.page-about .about-warranty__row summary::after {
  display: none;
}

.page-about .about-warranty__detail {
  display: grid;
  gap: 10px;
  padding: 0 0 22px;
}

.page-about .about-warranty__detail p {
  margin: 0;
  max-width: 66ch;
  font-size: 0.95rem;
  color: var(--ink-2);
}

.page-about .about-warranty__key {
  display: inline-block;
  min-width: 5.5em;
  margin-right: 8px;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--blue);
  border: 1px solid var(--blue-soft);
  background: var(--blue-soft);
  padding: 1px 7px;
}

.page-about .about-warranty__note {
  margin-top: clamp(22px, 3vw, 32px);
}

/* ---------- 资质档案 ---------- */
.page-about .about-cred {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3vw, 40px);
  margin-top: clamp(28px, 3vw, 44px);
}

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

.page-about .about-cred__item {
  position: relative;
  padding: 18px 18px 20px;
  border: 1px solid var(--rule);
  background: var(--paper-2);
  margin-bottom: -1px;
  transition: transform 0.22s var(--ease), background-color 0.22s var(--ease);
}

.page-about .about-cred__item:nth-child(even) {
  background: var(--paper);
}

.page-about .about-cred__item:hover {
  transform: translate(-1px, -2px);
  background: var(--paper);
  z-index: 1;
}

.page-about .about-cred__tag {
  position: absolute;
  top: -11px;
  left: 16px;
  padding: 2px 8px;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--blue);
  background: var(--paper);
  border: 1px solid var(--blue);
}

.page-about .about-cred__item h3 {
  margin: 6px 0 0;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--navy);
}

.page-about .about-cred__item p {
  margin: 8px 0 0;
  font-size: 0.94rem;
  color: var(--ink-2);
}

.page-about .about-cred__figure {
  margin: 0;
  padding: 10px;
  border: 1px solid var(--rule);
  background: var(--paper-2);
}

/* ---------- 更新与追溯 ---------- */
.page-about .about-trace {
  margin: clamp(22px, 3vw, 36px) 0 0;
  padding: 0;
  border-top: 1px solid var(--ink);
}

.page-about .about-trace__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--rule);
}

.page-about .about-trace__key {
  font-weight: 700;
  color: var(--navy);
}

.page-about .about-trace__val {
  margin: 0;
  max-width: 68ch;
  color: var(--ink-2);
  font-size: 0.95rem;
}

/* ---------- 交叉验证入口 ---------- */
.page-about .about-cross {
  padding: clamp(34px, 5vw, 76px) 0 clamp(44px, 6vw, 90px);
  border-top: 1px solid var(--rule);
  background:
    linear-gradient(180deg, rgba(21, 67, 230, 0.05), transparent 40%),
    var(--paper);
}

.page-about .about-cross__head {
  margin-bottom: clamp(18px, 2.4vw, 28px);
}

.page-about .about-cross__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-cross__item {
  border-top: 1px solid var(--rule);
}

.page-about .about-cross__item:last-child {
  border-bottom: 1px solid var(--rule);
}

.page-about .about-cross__item a {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 16px 4px;
  text-decoration: none;
  color: inherit;
  transition: padding-left 0.22s var(--ease), background-color 0.22s var(--ease);
}

.page-about .about-cross__item a:hover,
.page-about .about-cross__item a:focus-visible {
  padding-left: 12px;
  background: var(--paper-2);
}

.page-about .about-cross__label {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--navy);
}

.page-about .about-cross__item a:hover .about-cross__label {
  color: var(--blue);
}

.page-about .about-cross__desc {
  font-size: 0.9rem;
  color: var(--gray);
}

/* ---------- 响应式 ---------- */
@media (min-width: 768px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-timeline__row {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: var(--about-gap);
    padding-left: 26px;
  }

  .page-about .about-timeline__body p {
    max-width: 58ch;
  }

  .page-about .about-timeline__row:nth-child(even) .about-timeline__body {
    margin-left: clamp(0px, 4vw, 56px);
  }

  .page-about .about-timeline__mark {
    display: block;
  }

  .page-about .about-timeline__stage {
    display: block;
    margin-top: 6px;
  }

  .page-about .about-warranty__head {
    display: grid;
  }

  .page-about .about-warranty__row summary {
    grid-template-columns: 160px 160px minmax(0, 1fr) 30px;
    gap: var(--about-gap);
    align-items: center;
  }

  .page-about .about-warranty__base {
    grid-column: auto;
  }

  .page-about .about-warranty__row summary::after {
    display: block;
    justify-self: end;
    content: "+";
    font-family: var(--mono);
    font-size: 1.15rem;
    color: var(--blue);
  }

  .page-about .about-warranty__row[open] summary::after {
    content: "–";
  }

  .page-about .about-trace__row {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: baseline;
  }

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

@media (min-width: 900px) {
  .page-about .about-network__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  }
}

@media (min-width: 960px) {
  .page-about .about-cred {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-cred__item:nth-child(even) {
    margin-left: clamp(0px, 2.6vw, 38px);
  }

  .page-about .about-cred__item:nth-child(odd) {
    margin-right: clamp(0px, 2.6vw, 38px);
  }
}

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

  .page-about .about-section__rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }

  .page-about .about-hero__frame {
    padding-left: clamp(32px, 4vw, 64px);
  }
}

@media (max-width: 560px) {
  .page-about .about-lattice__grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

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

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__row,
  .page-about .about-cred__item,
  .page-about .about-cross__item a {
    transition: opacity 0.2s linear;
  }

  .page-about .about-cred__item:hover {
    transform: none;
  }
}
<<<END>>>