/* ===== page-about · 品牌价值与做事方式 ===== */

.page-about {
  --about-hair: rgba(124, 132, 150, .2);
  --about-hair-soft: rgba(124, 132, 150, .11);
  --about-pad: 56px;
  display: block;
}

.page-about .breadcrumb {
  padding-top: 20px;
}

/* ---------- 首屏：左叙事 / 右纯 CSS 视觉 ---------- */

.page-about .about-hero {
  padding: 32px 0 var(--about-pad);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 36px;
}

.page-about .about-hero__copy h1 {
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(34px, 8vw, 66px);
  line-height: 1.14;
  letter-spacing: .05em;
  color: var(--paper);
  margin: 16px 0 20px;
  max-width: 14em;
}

.page-about .about-hero__note {
  margin: 18px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--stone);
  max-width: 36em;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__visual {
  position: relative;
  aspect-ratio: 5 / 4;
  min-height: 220px;
  border: 1px solid var(--about-hair);
  background-image:
    repeating-linear-gradient(90deg, var(--about-hair-soft) 0 1px, transparent 1px 44px),
    repeating-linear-gradient(0deg, var(--about-hair-soft) 0 1px, transparent 1px 44px),
    linear-gradient(158deg, var(--panel) 0%, var(--ink) 68%);
  overflow: hidden;
}

.page-about .about-hero__band {
  position: absolute;
  left: -18%;
  right: -18%;
  top: 34%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
  box-shadow: 0 0 20px rgba(43, 230, 200, .45);
  transform: rotate(-13deg);
}

.page-about .about-hero__band--b {
  top: 68%;
  background: linear-gradient(90deg, transparent, var(--magenta), transparent);
  box-shadow: 0 0 20px rgba(255, 61, 154, .4);
  transform: rotate(-13deg);
}

.page-about .about-hero__node {
  position: absolute;
  width: 9px;
  height: 9px;
  background: var(--ink);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 12px rgba(43, 230, 200, .5);
}

.page-about .about-hero__node--1 { left: 18%; top: 24%; }
.page-about .about-hero__node--2 { left: 62%; top: 47%; border-color: var(--amber); box-shadow: 0 0 12px rgba(255, 138, 61, .5); }
.page-about .about-hero__node--3 { left: 34%; top: 76%; border-color: var(--magenta); box-shadow: 0 0 12px rgba(255, 61, 154, .5); }

/* ---------- 三条原则 ---------- */

.page-about .about-principles {
  padding: var(--about-pad) 0;
  border-top: 1px solid var(--about-hair-soft);
}

.page-about .principles {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
}

.page-about .principle {
  display: grid;
  gap: 10px;
  padding: 26px 0;
  border-top: 1px solid var(--about-hair);
}

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

.page-about .principle__num {
  font-size: 13px;
  letter-spacing: .2em;
  color: var(--cyan);
}

.page-about .principle__title {
  margin: 0;
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(24px, 5.4vw, 38px);
  line-height: 1.22;
  letter-spacing: .04em;
  color: var(--paper);
}

.page-about .principle__body p {
  margin: 0 0 12px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--paper);
  max-width: 36em;
}

.page-about .principle__body p:last-child {
  margin-bottom: 0;
}

.page-about .principle__result {
  border-left: 2px solid var(--clay);
  padding-left: 14px;
  font-size: 15px;
  line-height: 1.76;
}

/* ---------- 三次结构调整 ---------- */

.page-about .about-track {
  padding: var(--about-pad) 0;
  border-top: 1px solid var(--about-hair-soft);
}

.page-about .about-track .media {
  margin: 30px 0 8px;
}

.page-about .track {
  position: relative;
  list-style: none;
  margin: 28px 0 0;
  padding: 0 0 0 26px;
}

.page-about .track::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--stone) 0%, rgba(124, 132, 150, .08) 100%);
  opacity: .5;
}

.page-about .track__item {
  position: relative;
  padding-bottom: 16px;
}

.page-about .track__item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 21px;
  width: 9px;
  height: 9px;
  background: var(--ink);
  border: 1px solid var(--amber);
}

.page-about .track-node__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  min-height: 44px;
  padding: 14px 0;
  cursor: pointer;
  list-style: none;
  border-bottom: 1px solid var(--about-hair-soft);
}

.page-about .track-node__head::-webkit-details-marker {
  display: none;
}

.page-about .track-node__stage {
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--amber);
}

.page-about .track-node__title {
  font-family: var(--display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--paper);
}

.page-about .track-node__toggle {
  margin-left: auto;
  width: 10px;
  height: 10px;
  border-right: 1px solid var(--stone);
  border-bottom: 1px solid var(--stone);
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform 180ms var(--ease);
}

.page-about .track-node[open] .track-node__toggle {
  transform: rotate(-135deg) translate(-2px, -2px);
}

.page-about .track-node__body {
  padding: 16px 0 22px;
  max-width: 40em;
}

.page-about .track-node__body p {
  margin: 0 0 12px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--paper);
}

.page-about .track-node__body p:last-child {
  margin-bottom: 0;
  font-size: 15px;
  color: var(--stone);
  border-left: 2px solid var(--moss);
  padding-left: 14px;
}

/* ---------- 团队构成 ---------- */

.page-about .about-team {
  padding: var(--about-pad) 0;
  border-top: 1px solid var(--about-hair-soft);
}

.page-about .about-team__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-team__copy .prose {
  margin: 14px 0 0;
}

.page-about .team-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .team-list li {
  display: grid;
  gap: 6px;
  padding-top: 14px;
  border-top: 1px solid var(--about-hair);
  font-size: 16px;
  line-height: 1.78;
  color: var(--paper);
}

.page-about .team-list__k {
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cyan);
}

/* ---------- 覆盖与规模 ---------- */

.page-about .about-scale {
  padding: var(--about-pad) 0;
  border-top: 1px solid var(--about-hair-soft);
  background-image:
    repeating-linear-gradient(90deg, var(--about-hair-soft) 0 1px, transparent 1px 64px),
    repeating-linear-gradient(0deg, var(--about-hair-soft) 0 1px, transparent 1px 64px);
}

.page-about .scale-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 28px;
  border: 1px solid var(--about-hair);
  background: var(--about-hair);
}

.page-about .scale-cell {
  display: grid;
  align-content: start;
  gap: 6px;
  padding: 26px 20px 30px;
  background: var(--ink);
}

.page-about .scale-num {
  font-size: clamp(38px, 10vw, 62px);
  line-height: 1;
  letter-spacing: .04em;
}

.page-about .scale-unit {
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--stone);
}

.page-about .scale-cell p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--stone);
}

/* ---------- 备案与属地 ---------- */

.page-about .about-legal {
  padding: var(--about-pad) 0;
  border-top: 1px solid var(--about-hair-soft);
}

.page-about .about-legal__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-legal__copy .prose {
  margin: 14px 0 0;
}

.page-about .legal-list {
  margin: 24px 0 0;
  display: grid;
}

.page-about .legal-list > div {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .legal-list dt {
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--stone);
}

.page-about .legal-list dd {
  margin: 0;
  font-size: 16px;
  line-height: 1.6;
  color: var(--paper);
}

/* ---------- 对外合作 ---------- */

.page-about .about-coop {
  padding: var(--about-pad) 0 64px;
  border-top: 1px solid var(--about-hair-soft);
}

.page-about .about-coop__inner {
  display: grid;
  gap: 26px;
  padding: 28px 22px;
  border: 1px solid var(--about-hair);
  border-left: 2px solid var(--amber);
  background-image:
    linear-gradient(150deg, rgba(255, 138, 61, .1), transparent 58%),
    linear-gradient(180deg, var(--panel), var(--ink));
}

.page-about .about-coop__inner .prose {
  margin: 14px 0 0;
}

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

/* ---------- 窄屏兜底 ---------- */

.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ---------- 平板及以上 ---------- */

@media (min-width: 720px) {
  .page-about {
    --about-pad: 72px;
  }

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

  .page-about .team-list li {
    grid-template-columns: 128px minmax(0, 1fr);
    gap: 22px;
    align-items: baseline;
  }
}

@media (min-width: 880px) {
  .page-about .about-hero {
    padding: 40px 0 var(--about-pad);
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 60px;
    align-items: center;
  }

  .page-about .principle {
    grid-template-columns: 64px minmax(0, .85fr) minmax(0, 1.15fr);
    gap: 40px;
    align-items: start;
    padding: 38px 0;
  }

  .page-about .principle__body p {
    margin-top: -6px;
  }

  .page-about .principle__body p:first-child {
    margin-top: 0;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, .78fr) minmax(0, 1.22fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-legal__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    gap: 56px;
    align-items: center;
  }

  .page-about .legal-list > div {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }

  .page-about .about-coop__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 48px;
    align-items: center;
    padding: 40px 36px;
  }

  .page-about .about-coop__actions {
    flex-direction: column;
    align-items: stretch;
  }
}

/* ---------- 动效降级 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .track-node__toggle {
    transition: none;
  }
}
<<<END>>>