.page-about {
  position: relative;
  overflow-x: clip;
}

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

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding-top: 1.5rem;
  padding-bottom: 0.25rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.75rem, 5vw, 3.25rem);
  align-items: start;
}

.page-about .about-hero__h1 {
  margin: 0.9rem 0 0;
  max-width: 20ch;
}

.page-about .about-hero__intro {
  margin-top: 1.25rem;
  max-width: 48ch;
  color: var(--silver);
}

.page-about .about-hero__note {
  margin-top: 0.9rem;
  max-width: 46ch;
  color: var(--mist);
}

.page-about .about-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.page-about .about-hero__aside {
  position: relative;
  padding-left: 1.6rem;
}

.page-about .about-hero__rot {
  position: absolute;
  left: 0;
  top: 2.5rem;
  writing-mode: vertical-rl;
  font-size: 0.68rem;
  letter-spacing: 0.32em;
  color: var(--cyan);
  opacity: 0.62;
}

.page-about .about-hero__media {
  margin: 0;
}

.page-about .about-hero__media .media__img {
  width: 100%;
  height: auto;
  object-fit: cover;
  display: block;
}

/* ---------- 规模数字带 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(2rem, 5vw, 3.25rem) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 1.1rem 1.15rem;
  background: var(--panel);
}

.page-about .about-stats__num {
  font-size: clamp(1.3rem, 4.5vw, 1.7rem);
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .about-stats__label {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* ---------- 章节标题 ---------- */
.page-about .about-heading {
  position: relative;
  padding-right: 1.75rem;
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .about-heading__title {
  margin: 0.6rem 0 0;
  max-width: 26ch;
}

.page-about .about-heading__rot {
  position: absolute;
  right: 0;
  top: 0;
  writing-mode: vertical-rl;
  font-size: 0.63rem;
  letter-spacing: 0.3em;
  color: var(--violet);
  opacity: 0.58;
}

/* ---------- 运营区域 ---------- */
.page-about .about-origin__grid {
  display: grid;
  gap: clamp(1.25rem, 4vw, 2rem);
  align-items: start;
}

.page-about .about-origin__panel .panel__body p + p {
  margin-top: 1rem;
}

.page-about .about-origin__stack {
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
}

.page-about .about-origin__tip {
  color: var(--mist);
}

/* ---------- 三条业务线 ---------- */
.page-about .about-lines__filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.page-about .about-lines__filter .filter__btn[aria-pressed="true"] {
  border-color: var(--cyan);
  color: var(--cyan);
  background: linear-gradient(90deg, rgba(34, 211, 238, 0.14), rgba(168, 85, 247, 0.12));
}

.page-about .filter__count {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--cyan);
  margin-left: 0.35rem;
}

.page-about .filter__unit {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .about-lines__list {
  display: grid;
  gap: 1px;
  margin-top: 1.5rem;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
}

.page-about .about-line {
  display: grid;
  gap: 0.7rem;
  padding: clamp(1.25rem, 4vw, 2rem);
  background: var(--panel);
  border-left: 2px solid var(--line);
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.page-about .about-line[hidden],
.page-about .about-line.is-hidden {
  display: none;
}

.page-about .about-line--cyan { border-left-color: var(--cyan); }
.page-about .about-line--violet { border-left-color: var(--violet); }
.page-about .about-line--amber { border-left-color: var(--amber); }

.page-about .about-line__idx {
  margin: 0;
  font-size: 0.68rem;
  letter-spacing: 0.26em;
  color: var(--mist);
}

.page-about .about-line__title {
  margin: 0;
  font-size: clamp(1.2rem, 4.2vw, 1.55rem);
  font-weight: 700;
  letter-spacing: 0.01em;
}

.page-about .about-line__desc {
  margin: 0;
  max-width: 62ch;
}

.page-about .about-line__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0.2rem 0 0;
  padding: 0;
  list-style: none;
}

/* ---------- 逐季校准 ---------- */
.page-about .about-calibration__grid {
  display: grid;
  gap: clamp(1.5rem, 5vw, 2.5rem);
  align-items: start;
}

.page-about .about-calibration__text p + p {
  margin-top: 1rem;
}

.page-about .about-calibration__media {
  margin: 0;
}

.page-about .about-calibration__media .media__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-scale {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(1.75rem, 5vw, 3rem) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
}

.page-about .about-scale__item {
  display: flex;
  align-items: baseline;
  gap: 0.3rem;
  padding: 1rem 1.1rem;
  background: linear-gradient(180deg, rgba(226, 232, 240, 0.07), rgba(148, 163, 184, 0.02));
}

.page-about .about-scale__num {
  font-size: clamp(1.35rem, 4.6vw, 1.65rem);
  line-height: 1;
  color: var(--silver);
}

.page-about .about-scale__unit {
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .about-scale__note {
  margin-top: 0.9rem;
  color: var(--mist);
}

/* ---------- 协作网络 ---------- */
.page-about .about-network__grid {
  display: grid;
  gap: clamp(1.5rem, 5vw, 2.5rem);
  align-items: start;
}

.page-about .about-network__media {
  margin: 0;
}

.page-about .about-network__media .media__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-network__body p + p {
  margin-top: 1rem;
}

.page-about .about-network__figures {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.page-about .about-figure {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 0.9rem 0.25rem 0.6rem;
  border-top: 1px solid var(--line);
}

.page-about .about-figure__num {
  font-size: clamp(1.25rem, 4.5vw, 1.55rem);
  line-height: 1.1;
  color: var(--violet);
}

.page-about .about-figure__label {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .about-network__tip {
  margin-top: 1.25rem;
  color: var(--mist);
}

/* ---------- 档案安全 ---------- */
.page-about .about-trust__grid {
  display: grid;
  gap: 1rem;
}

.page-about .about-trust__card {
  position: relative;
}

.page-about .about-trust__idx {
  position: absolute;
  right: 1rem;
  top: 0.85rem;
  font-size: 0.66rem;
  letter-spacing: 0.24em;
  color: var(--mist);
}

.page-about .about-trust__note {
  margin-top: 1.5rem;
  padding: 1.15rem 1.25rem;
  border-left: 2px solid var(--cyan);
  background: rgba(34, 211, 238, 0.05);
}

.page-about .about-trust__note p {
  margin: 0;
}

/* ---------- 版本迭代 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline__node {
  position: relative;
  padding-left: 2.25rem;
}

.page-about .about-timeline__node::before {
  content: "";
  position: absolute;
  left: 0.3rem;
  top: 1.5rem;
  bottom: -0.1rem;
  width: 1px;
  background: var(--line);
}

.page-about .about-timeline__node:last-child::before {
  display: none;
}

.page-about .about-timeline__node::after {
  content: "";
  position: absolute;
  left: 0.3rem;
  top: 1.2rem;
  width: 8px;
  height: 8px;
  margin-left: -3.5px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.08);
}

.page-about .about-node__sum {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.85rem;
  padding: 0.6rem 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-node__year {
  font-size: 0.85rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-node__label {
  font-size: 1rem;
  font-weight: 600;
  color: var(--silver);
  transition: color 0.25s var(--ease);
}

.page-about .about-node[open] .about-node__label {
  color: #E2E8F0;
}

.page-about .about-node__body {
  padding: 0.1rem 0 1rem;
}

.page-about .about-node__body p {
  margin: 0;
  color: var(--mist);
  max-width: 58ch;
}

/* ---------- 结尾引导 ---------- */
.page-about .about-next__inner {
  padding: clamp(1.5rem, 5vw, 3rem);
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: linear-gradient(155deg, rgba(34, 211, 238, 0.07), rgba(168, 85, 247, 0.08) 58%, transparent);
  box-shadow: var(--shadow-panel);
}

.page-about .about-next__title {
  margin: 0.6rem 0 0;
  max-width: 22ch;
}

.page-about .about-next__text {
  margin-top: 1rem;
  max-width: 56ch;
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 768px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
  }

  .page-about .about-calibration__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.75fr);
  }

  .page-about .about-network__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }

  .page-about .about-line__title {
    font-size: 1.55rem;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1024px) {
  .page-about .about-scale {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .about-hero__grid {
    gap: 4rem;
  }

  .page-about .about-heading__rot {
    opacity: 0.7;
  }

  .page-about .about-scale__item {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.4rem;
  }
}
<<<END>>>