.page-about {
  --about-signal-deep: #b4400f;
  --about-paper-line: rgba(30, 23, 16, 0.14);
  --about-body-soft: rgba(237, 230, 218, 0.82);
  background: var(--ink);
  color: var(--bone);
}

.page-about .about-shell {
  display: grid;
  gap: 48px;
  padding-block: 18px 72px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  background: var(--ink-deep);
  padding: 30px 20px 28px;
  isolation: isolate;
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-hero__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.26;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(6, 16, 25, 0.5) 0%, rgba(6, 16, 25, 0.88) 58%, var(--ink-deep) 100%);
}

.page-about .about-hero__body {
  position: relative;
  z-index: 2;
  display: grid;
  gap: 18px;
}

.page-about .about-hero__kicker {
  margin: 0;
  color: var(--amber);
  letter-spacing: 0.06em;
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: 88%;
  font-size: clamp(30px, 7.4vw, 60px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--bone);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-body-soft);
}

.page-about .about-hero__stats {
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1fr);
  padding-top: 4px;
}

.page-about .about-stat {
  border-left: 1px solid var(--line-mid);
  padding-left: 14px;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 26px;
  line-height: 1.1;
  color: var(--signal-soft);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 5px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 4px;
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  display: grid;
  gap: 22px;
}

.page-about .about-line {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: 22px 20px;
}

.page-about .about-line__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--bone);
}

.page-about .about-line p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-body-soft);
}

.page-about .about-lines {
  display: grid;
  gap: 16px;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  display: grid;
  gap: 22px;
}

.page-about .about-scale {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: none;
}

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

.page-about .about-scale__item {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--mist);
  text-decoration: none;
  transition: border-color 160ms var(--ease), color 160ms var(--ease), background-color 160ms var(--ease);
}

.page-about .about-scale__tick {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  background: var(--signal);
  border-radius: 1px;
}

.page-about .about-scale__year {
  color: var(--bone);
  font-weight: 500;
}

.page-about .about-scale__label {
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 12px;
}

.page-about .about-scale__item:hover,
.page-about .about-scale__item:focus-visible {
  border-color: var(--cyan);
  background: rgba(55, 227, 211, 0.1);
}

.page-about .about-scale__item:hover .about-scale__year,
.page-about .about-scale__item:focus-visible .about-scale__year {
  color: var(--cyan);
}

.page-about .about-timeline__media {
  margin: 0 0 18px;
  aspect-ratio: 2 / 1;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-timeline__media .media-frame__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-node {
  display: grid;
  gap: 10px;
  padding: 20px 18px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background: var(--surface);
  transition: border-color 160ms var(--ease), transform 160ms var(--ease);
}

.page-about .about-node + .about-node {
  margin-top: 14px;
}

.page-about .about-node:hover {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .about-node:target {
  border-color: var(--signal);
  box-shadow: inset 0 0 0 1px var(--signal);
}

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

.page-about .about-node__year {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 22px;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .about-node__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--bone);
}

.page-about .about-node p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-body-soft);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 24px;
}

.page-about .about-bar {
  display: flex;
  min-height: 74px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .about-bar__seg {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 3px;
  padding: 12px 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.35;
  color: var(--bone);
  transition: background-color 160ms var(--ease);
}

.page-about .about-bar__seg--rd {
  flex: 0 0 60%;
  background: rgba(255, 107, 44, 0.22);
}

.page-about .about-bar__seg--rd:hover {
  background: rgba(255, 107, 44, 0.4);
}

.page-about .about-bar__seg--rest {
  flex: 1 1 40%;
  background: rgba(55, 227, 211, 0.16);
  border-left: 1px solid var(--line-soft);
}

.page-about .about-bar__seg--rest:hover {
  background: rgba(55, 227, 211, 0.34);
}

.page-about .about-team__cap {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-team__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-team__row {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-team__k {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--signal-soft);
}

.page-about .about-team__v {
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-body-soft);
}

/* ---------- 资质（纸感区块） ---------- */
.page-about .about-cert__paper {
  padding: 26px 20px 30px;
  border-radius: var(--radius-lg);
}

.page-about .about-cert__grid {
  display: grid;
  gap: 24px;
}

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

.page-about .about-cert__num {
  color: var(--about-signal-deep);
}

.page-about .about-cert__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 800;
  font-stretch: 88%;
  color: var(--brown);
}

.page-about .about-cert__lede {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--brown);
}

.page-about .about-cert .about-cert__accordion {
  border-top: 1px solid var(--about-paper-line);
}

.page-about .about-cert .accordion__item {
  border-bottom: 1px solid var(--about-paper-line);
}

.page-about .about-cert .about-cert__q {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
}

.page-about .about-cert .accordion__trigger {
  color: var(--brown);
  font-family: var(--font-body);
}

.page-about .about-cert .accordion__panel {
  color: var(--brown);
}

.page-about .about-cert .accordion__panel p {
  margin: 0 0 14px;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.85;
}

.page-about .about-cert__media {
  margin: 0;
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-cert__media .media-frame__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 服务方式 ---------- */
.page-about .about-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-step__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--signal-soft);
  padding-top: 3px;
}

.page-about .about-step__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--bone);
}

.page-about .about-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-body-soft);
}

.page-about .about-steps__foot {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-steps__foot a {
  color: var(--cyan);
  text-underline-offset: 3px;
}

.page-about .about-steps__foot a:hover {
  color: var(--bone);
}

/* ---------- 行业场景 ---------- */
.page-about .about-scenes {
  display: grid;
  gap: 14px;
}

.page-about .about-scene {
  display: grid;
  gap: 8px;
  align-content: start;
  padding: 20px 18px;
  border-top: 3px solid rgba(55, 227, 211, 0.5);
}

.page-about .about-scene:nth-child(2) {
  border-top-color: rgba(255, 107, 44, 0.6);
}

.page-about .about-scene:nth-child(3) {
  border-top-color: rgba(240, 184, 74, 0.6);
}

.page-about .about-scene:nth-child(4) {
  border-top-color: rgba(126, 144, 163, 0.7);
}

.page-about .about-scene__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--bone);
}

.page-about .about-scene p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--about-body-soft);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  display: grid;
  gap: 14px;
  padding: 28px 20px 30px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(120% 140% at 0% 0%, rgba(55, 227, 211, 0.14) 0%, rgba(10, 24, 38, 0) 58%),
    var(--ink-deep);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 4.4vw, 30px);
  font-weight: 800;
  font-stretch: 88%;
  line-height: 1.25;
  color: var(--bone);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-body-soft);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 4px;
}

.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 窄屏适配 ---------- */
@media (max-width: 420px) {
  .page-about .about-hero {
    padding: 24px 16px 24px;
  }

  .page-about .about-step {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }

  .page-about .about-step__idx {
    padding-top: 0;
  }

  .page-about .about-bar {
    min-height: 88px;
  }

  .page-about .about-bar__seg {
    font-size: 12px;
    padding: 10px 8px;
  }
}

/* ---------- 中等屏 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-team__row {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 16px;
    align-items: start;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-shell {
    gap: 64px;
    padding-block: 24px 96px;
  }

  .page-about .about-hero {
    padding: 48px 40px 44px;
  }

  .page-about .about-hero__body {
    max-width: 760px;
  }

  .page-about .about-hero__stats {
    max-width: 640px;
  }

  .page-about .about-lines {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-timeline {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-scale {
    position: sticky;
    top: 96px;
    flex-direction: column;
    gap: 12px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-scale__item {
    display: grid;
    grid-template-columns: 12px minmax(0, 1fr);
    grid-template-areas:
      "tick year"
      "tick label";
    gap: 2px 10px;
    padding: 12px 14px;
    border-radius: var(--radius-sm);
    align-items: center;
  }

  .page-about .about-scale__tick {
    grid-area: tick;
    align-self: start;
    margin-top: 6px;
  }

  .page-about .about-scale__year {
    grid-area: year;
    font-size: 15px;
  }

  .page-about .about-scale__label {
    grid-area: label;
  }

  .page-about .about-timeline__media {
    aspect-ratio: 12 / 5;
    margin-bottom: 24px;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 36px;
    align-items: start;
  }

  .page-about .about-cert__paper {
    padding: 40px 40px 44px;
  }

  .page-about .about-cert__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-step {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 20px;
    padding: 22px 0;
  }

  .page-about .about-cta {
    padding: 40px 40px 44px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-scenes {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 减少动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-node,
  .page-about .about-bar__seg,
  .page-about .about-scale__item {
    transition: none;
  }

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