.page-about {
  --about-aside-w: 200px;
  background: var(--paper);
  color: var(--ink);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-block: 22px 10px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: 6px clamp(36px, 5vw, 64px);
}

.page-about .about-hero__frame {
  position: relative;
  background: var(--white);
  border: 1px solid var(--line-strong);
  padding: clamp(22px, 3.2vw, 46px);
  overflow: hidden;
}

.page-about .about-hero__frame::before,
.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  pointer-events: none;
}

.page-about .about-hero__frame::before {
  top: 10px;
  left: 10px;
  border-top: 2px solid var(--hot);
  border-left: 2px solid var(--hot);
}

.page-about .about-hero__frame::after {
  right: 10px;
  bottom: 10px;
  border-right: 2px solid var(--hot);
  border-bottom: 2px solid var(--hot);
}

.page-about .about-scale {
  height: 10px;
  margin-bottom: clamp(20px, 3vw, 34px);
  border-bottom: 1px solid var(--line);
  background-image: repeating-linear-gradient(
    to right,
    var(--line-strong) 0 1px,
    transparent 1px 14px
  );
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(18px, 3vw, 40px);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--steel-500);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 4.4vw, 54px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-hero__lead {
  margin: 0 0 22px;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.95;
  color: var(--steel-700);
  max-width: 34em;
}

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

.page-about .about-hero__band {
  list-style: none;
  margin: clamp(26px, 3.6vw, 44px) 0 0;
  padding: clamp(20px, 2.4vw, 28px) 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 18px 20px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-about .about-hero__band li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0 5px;
  min-width: 0;
}

.page-about .about-hero__num {
  font-size: clamp(28px, 3.4vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--ink);
}

.page-about .about-hero__band li:first-child .about-hero__num {
  color: var(--hot);
}

.page-about .about-hero__unit {
  font-size: 13px;
  color: var(--steel-500);
}

.page-about .about-hero__label {
  flex-basis: 100%;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--steel-500);
  letter-spacing: 0.01em;
}

/* ---------- 章节索引条 ---------- */
.page-about .about-index {
  position: sticky;
  top: var(--header-space);
  z-index: 6;
  background: var(--paper);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 12px 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-index__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__list li {
  flex: 0 0 auto;
}

.page-about .about-index__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--white);
  color: var(--steel-700);
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 180ms ease, color 180ms ease, background-color 180ms ease;
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  border-color: var(--blue);
  color: var(--blue);
  background: var(--white);
}

.page-about .about-index__list .mono {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--steel-500);
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  padding-block: clamp(46px, 6.5vw, 96px);
}

.page-about .about-chapter--last {
  padding-bottom: clamp(56px, 8vw, 110px);
}

.page-about .about-chapter__grid {
  display: grid;
  gap: clamp(18px, 2.8vw, 40px);
}

.page-about .about-chapter__aside {
  position: relative;
  padding-left: 16px;
  border-left: 2px solid var(--line);
}

.page-about .about-chapter__no {
  display: block;
  font-size: clamp(34px, 4vw, 52px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.05em;
  color: var(--steel-500);
}

@supports (-webkit-text-stroke: 1px black) {
  .page-about .about-chapter__no {
    color: transparent;
    -webkit-text-stroke: 1px var(--steel-500);
  }
}

.page-about .about-chapter__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(20px, 2.1vw, 26px);
  line-height: 1.35;
  color: var(--ink);
}

.page-about .about-chapter__body > * + * {
  margin-top: clamp(18px, 2.4vw, 28px);
}

.page-about .about-p {
  margin: 0;
  font-size: 16px;
  line-height: 1.95;
  color: var(--steel-700);
  max-width: 38em;
}

.page-about .about-aside-link {
  margin: 0;
  font-size: 14px;
  line-height: 1.9;
  color: var(--steel-500);
}

.page-about .about-aside-link a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(15, 91, 216, 0.32);
  transition: border-color 160ms ease;
}

.page-about .about-aside-link a:hover,
.page-about .about-aside-link a:focus-visible {
  border-bottom-color: var(--blue);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0;
  padding: 8px;
  background: var(--white);
  border: 1px solid var(--line);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.06);
}

/* ---------- 要点列表 ---------- */
.page-about .about-points {
  list-style: none;
  margin: 0;
  padding: clamp(18px, 2.4vw, 26px) 0 0;
  border-top: 1px solid var(--line-soft);
  display: grid;
  gap: 16px;
}

.page-about .about-points li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 10px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--steel-700);
}

.page-about .about-points__k {
  padding-top: 5px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--steel-500);
  border-top: 2px solid var(--cyan);
}

/* ---------- 网点 ---------- */
.page-about .about-network {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  padding: clamp(18px, 2.6vw, 32px);
  background: var(--white);
  border: 1px solid var(--line);
}

.page-about .about-network__map svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-map__line {
  fill: none;
  stroke: var(--line-strong);
  stroke-width: 1;
}

.page-about .about-map__dot {
  fill: var(--steel-500);
}

.page-about .about-map__dot--hub {
  fill: var(--hot);
}

.page-about .about-map__ring {
  fill: none;
  stroke: var(--hot);
  stroke-width: 1.5;
  opacity: 0.45;
}

.page-about .about-network__legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
  align-content: center;
}

.page-about .about-network__legend li {
  padding-left: 14px;
  border-left: 2px solid var(--steel-100);
}

.page-about .about-network__legend li:last-child {
  border-left-color: var(--cyan);
}

.page-about .about-network__n {
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.page-about .about-network__t {
  margin-left: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
}

.page-about .about-network__d {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--steel-500);
}

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

.page-about .about-pickup__card {
  padding: 18px 20px 20px;
  background: var(--white);
  border: 1px solid var(--line);
  border-top: 3px solid var(--steel-500);
}

.page-about .about-pickup__card--hot {
  border-top-color: var(--hot);
}

.page-about .about-pickup__card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--steel-700);
}

.page-about .about-pickup__tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--steel-700);
  background: var(--steel-100);
  border-radius: var(--r-1);
}

.page-about .about-pickup__card--hot .about-pickup__tag {
  color: var(--white);
  background: var(--hot);
}

/* ---------- 图文分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(18px, 2.6vw, 32px);
}

.page-about .about-split__text > * + * {
  margin-top: 16px;
}

/* ---------- 数字卡 ---------- */
.page-about .about-nums {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-about .about-num {
  position: relative;
  padding: 18px 16px;
  background: var(--white);
  border: 1px solid var(--line);
  transition: border-color 180ms ease, background-color 180ms ease;
}

.page-about .about-num:last-child {
  grid-column: 1 / -1;
}

.page-about .about-num:hover,
.page-about .about-num:focus-within {
  border-color: var(--blue);
}

.page-about .about-num__v {
  font-size: clamp(28px, 3.2vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--ink);
}

.page-about .about-num__u {
  margin-left: 5px;
  font-size: 12px;
  color: var(--steel-500);
}

.page-about .about-num__l {
  display: block;
  margin-top: 8px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--steel-700);
}

.page-about .about-num__tip {
  display: block;
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--steel-500);
}

/* ---------- 质量流程 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  counter-reset: flow;
}

.page-about .about-flow__step {
  position: relative;
  padding: 20px 0 20px 22px;
  border-left: 1px solid var(--line);
}

.page-about .about-flow__step::before {
  content: "";
  position: absolute;
  top: 26px;
  left: -4px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--white);
  border: 2px solid var(--steel-500);
}

.page-about .about-flow__step:first-child::before,
.page-about .about-flow__step:last-child::before {
  border-color: var(--hot);
  background: var(--hot);
}

.page-about .about-flow__no {
  display: block;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--steel-500);
}

.page-about .about-flow__t {
  margin: 6px 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--steel-700);
}

/* ---------- 行业场景 ---------- */
.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-industry {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-industry li {
  padding: 18px 20px 20px;
  background: var(--white);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
}

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

.page-about .about-ind__name {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-ind__scene {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--steel-700);
}

.page-about .about-ind__do {
  margin: 12px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--steel-700);
}

.page-about .about-ind__do .mono {
  margin-right: 6px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  border-top: 1px solid var(--line);
  padding-top: clamp(18px, 2.4vw, 26px);
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 20px;
  border-left: 1px solid var(--line);
}

.page-about .about-timeline__trigger {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 10px;
  width: 100%;
  padding: 10px 0;
  background: none;
  border: 0;
  text-align: left;
  cursor: pointer;
  color: var(--ink);
}

.page-about .about-timeline__stage {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--steel-500);
}

.page-about .about-timeline__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 16px;
  line-height: 1.45;
}

.page-about .about-timeline__trigger .disclosure__sign {
  margin-left: auto;
}

.page-about .about-timeline__panel p {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--steel-700);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta__grid {
  display: grid;
  gap: clamp(26px, 4vw, 56px);
}

.page-about .about-cta__eyebrow {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--hot);
}

.page-about .about-cta__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 2.8vw, 34px);
  line-height: 1.32;
  color: var(--white);
}

.page-about .about-cta__text {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.95;
  color: var(--dark-muted);
  max-width: 36em;
}

.page-about .about-cta__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .about-cta__links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--line-dark);
  color: var(--white);
  font-size: 15px;
  line-height: 1.5;
  text-decoration: none;
  transition: border-color 180ms ease, background-color 180ms ease;
}

.page-about .about-cta__links a:hover,
.page-about .about-cta__links a:focus-visible {
  border-color: var(--hot);
  background: rgba(255, 74, 28, 0.12);
}

.page-about .about-cta__links .mono {
  color: var(--hot);
  font-size: 16px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero__band {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .about-num:last-child {
    grid-column: auto;
  }

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

  .page-about .about-network {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .about-chapter__grid {
    grid-template-columns: minmax(0, var(--about-aside-w)) minmax(0, 1fr);
    gap: clamp(28px, 3.4vw, 56px);
  }

  .page-about .about-chapter__aside {
    position: sticky;
    top: calc(var(--header-space) + 76px);
    align-self: start;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-split--flip {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 20px;
    border-top: 1px solid var(--line);
    padding-top: 26px;
  }

  .page-about .about-flow__step {
    padding: 0 0 0 0;
    border-left: 0;
    border-top: 1px solid var(--line);
    padding-top: 18px;
  }

  .page-about .about-flow__step::before {
    top: -5px;
    left: 0;
  }

  .page-about .about-timeline {
    grid-auto-flow: column;
    grid-auto-columns: 260px;
    gap: 0;
    overflow-x: auto;
    padding-bottom: 8px;
  }

  .page-about .about-timeline__item {
    padding: 26px 20px 0 20px;
  }

  .page-about .about-timeline__item::before {
    content: "";
    position: absolute;
    top: -5px;
    left: -5px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--white);
    border: 2px solid var(--steel-500);
  }

  .page-about .about-timeline__item:first-child::before,
  .page-about .about-timeline__item:last-child::before {
    background: var(--hot);
    border-color: var(--hot);
  }

  .page-about .about-cta__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

@media (min-width: 1200px) {
  .page-about .about-industry {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-chapter__grid {
    grid-template-columns: minmax(0, 220px) minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__list a,
  .page-about .about-num,
  .page-about .about-cta__links a,
  .page-about .about-aside-link a {
    transition: none;
  }
}
<<<END>>>