.page-about {
  --about-toc: 180px;
  --about-ink-soft: #1B3348;
  display: block;
}

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

.page-about .media-frame {
  overflow: hidden;
}

.page-about .media-frame > img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 档案封面 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding-block: clamp(24px, 5vw, 56px) clamp(28px, 5vw, 60px);
  border-bottom: 1px solid var(--line);
  background: var(--paper);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: 0;
  right: -14vw;
  top: -20vw;
  width: 48vw;
  height: 48vw;
  min-width: 260px;
  min-height: 260px;
  background: radial-gradient(circle, rgba(255, 106, 26, 0.2), rgba(255, 106, 26, 0) 68%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(22px, 4vw, 44px);
  align-items: center;
}

.page-about .about-hero__stamp {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin: 0 0 8px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__stamp-num {
  font-family: var(--mono);
  font-weight: 900;
  font-size: clamp(44px, 9vw, 88px);
  line-height: 0.88;
  letter-spacing: -0.03em;
  color: var(--orange);
}

.page-about .about-hero__stamp-label {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  margin: 0;
  font-size: clamp(38px, 8vw, 82px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 50ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--about-ink-soft);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__facts li {
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
  background: var(--paper-card);
  font-size: 12px;
  color: var(--ink);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-hero__frame {
  margin: 0;
  position: relative;
  clip-path: polygon(0 7%, 100% 0, 100% 100%, 0 100%);
  background: linear-gradient(150deg, var(--night), var(--ink));
  box-shadow: var(--shadow);
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    gap: clamp(28px, 4vw, 64px);
  }
}

/* ---------- 数据条 ---------- */

.page-about .about-stats {
  position: relative;
  background: var(--ink);
  color: var(--paper);
  overflow: hidden;
}

.page-about .about-stats::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.07) 0 1px,
    transparent 1px 88px
  );
  pointer-events: none;
}

.page-about .about-stats__grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(255, 255, 255, 0.14);
  border-left: 1px solid rgba(255, 255, 255, 0.14);
  border-right: 1px solid rgba(255, 255, 255, 0.14);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(16px, 3vw, 28px) clamp(12px, 2.4vw, 24px);
  background: var(--ink);
}

.page-about .about-stat__num {
  font-family: var(--mono);
  font-weight: 900;
  font-size: clamp(26px, 4.4vw, 40px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--orange);
}

.page-about .about-stat__label {
  font-size: 12px;
  line-height: 1.5;
  color: rgba(247, 242, 232, 0.72);
}

@media (min-width: 760px) {
  .page-about .about-stats__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 主体：目录刻度 + 内容流 ---------- */

.page-about .about-body {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
  padding-block: clamp(26px, 4.5vw, 60px);
}

.page-about .about-toc__title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-toc__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

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

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

.page-about .about-toc__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--paper-card);
  color: var(--ink);
  font-size: 13px;
  text-decoration: none;
  transition: border-color 120ms var(--ease), color 120ms var(--ease);
}

.page-about .about-toc__list a .mono {
  color: var(--orange);
  font-size: 11px;
  font-weight: 700;
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  border-color: var(--lime);
  color: var(--orange-deep);
}

@media (min-width: 1080px) {
  .page-about .about-body {
    grid-template-columns: var(--about-toc) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    gap: 0;
    padding: 0;
    border-left: 1px solid var(--line);
    overflow: visible;
  }

  .page-about .about-toc__list a {
    width: 100%;
    padding: 10px 12px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: transparent;
  }

  .page-about .about-toc__list a:hover,
  .page-about .about-toc__list a:focus-visible {
    border-left-color: var(--lime);
    background: rgba(200, 242, 78, 0.14);
  }
}

/* ---------- 章节骨架 ---------- */

.page-about .about-sec {
  padding-block: clamp(26px, 4vw, 52px);
  border-top: 1px solid var(--line);
  scroll-margin-top: 104px;
}

.page-about .about-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-sec .chapter__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px 16px;
  margin-bottom: 14px;
}

.page-about .about-sec .chapter__num {
  font-size: clamp(20px, 3.2vw, 30px);
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--orange);
  line-height: 1;
}

.page-about .about-sec .chapter__title {
  margin: 0;
  font-size: clamp(22px, 3.6vw, 34px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-lede {
  margin: 0 0 22px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

.page-about .about-sec p {
  max-width: 62ch;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

.page-about .about-sec a {
  color: var(--orange-deep);
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-timeline__item {
  border-left: 3px solid var(--orange);
  padding-left: clamp(12px, 2.4vw, 20px);
  background: var(--paper-card);
  box-shadow: inset 0 -1px 0 var(--line);
}

.page-about .about-timeline__item:nth-child(even) {
  margin-left: clamp(0px, 3.4vw, 46px);
  border-left-color: var(--amber);
}

.page-about .about-tl__sum {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  padding: 14px 4px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-tl__sum::after {
  content: "+";
  margin-left: auto;
  padding-left: 10px;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 18px;
  color: var(--orange);
  transition: transform 200ms var(--ease);
}

.page-about .about-tl[open] .about-tl__sum::after {
  content: "\2013";
}

.page-about .about-tl__sum:hover .about-tl__name,
.page-about .about-tl__sum:focus-visible .about-tl__name {
  color: var(--orange-deep);
}

.page-about .about-tl__sum:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

.page-about .about-tl__ver {
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--ink);
  background: rgba(200, 242, 78, 0.5);
  padding: 3px 8px;
  border-radius: 2px;
}

.page-about .about-tl__name {
  font-weight: 700;
  font-size: clamp(15px, 2vw, 17px);
  color: var(--ink);
  transition: color 120ms var(--ease);
}

.page-about .about-tl__body {
  padding: 0 4px 16px;
}

.page-about .about-tl__body p {
  margin: 0;
  font-size: 14.5px;
}

/* ---------- 团队 ---------- */

.page-about .about-team__frame {
  margin: 0 0 24px;
  background: linear-gradient(160deg, var(--night), var(--ink));
}

.page-about .about-team {
  display: grid;
  gap: 18px;
}

.page-about .about-team__card .card__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.page-about .about-team__count {
  font-size: 12px;
  font-weight: 700;
  color: var(--ink);
  background: var(--amber);
  padding: 3px 8px;
  border-radius: 2px;
}

.page-about .about-team__card .card__body h3 {
  margin: 0 0 8px;
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-team__card .card__body p {
  margin: 0 0 12px;
  font-size: 14.5px;
}

.page-about .about-team__card .tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 760px) {
  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-team > :nth-child(2) {
    margin-top: 30px;
  }

  .page-about .about-team > :nth-child(3) {
    margin-top: -14px;
  }

  .page-about .about-team > :nth-child(4) {
    margin-top: 14px;
  }
}

/* ---------- 三条主线 ---------- */

.page-about .about-lines {
  display: grid;
  gap: 18px;
}

.page-about .about-line {
  position: relative;
  padding: 22px clamp(16px, 2.6vw, 26px);
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-top: 4px solid var(--ink);
}

.page-about .about-line:nth-child(2) {
  border-top-color: var(--orange);
}

.page-about .about-line:nth-child(3) {
  border-top-color: var(--lime);
}

.page-about .about-line h3 {
  margin: 14px 0 10px;
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 800;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .about-line p {
  margin: 0;
  font-size: 15px;
}

@media (min-width: 920px) {
  .page-about .about-lines {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-line:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .about-line:nth-child(3) {
    margin-top: -12px;
  }
}

/* ---------- 本地生态 ---------- */

.page-about .about-eco {
  display: grid;
  gap: clamp(22px, 3.6vw, 40px);
  align-items: start;
}

.page-about .about-eco__figures {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-bottom: 20px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-eco__fig {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 12px;
  background: var(--ink);
}

.page-about .about-eco__fig-num {
  font-size: clamp(24px, 3.6vw, 34px);
  font-weight: 900;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-eco__fig-label {
  font-size: 12px;
  line-height: 1.4;
  color: rgba(247, 242, 232, 0.74);
}

.page-about .about-eco__text > p {
  margin: 0 0 18px;
  font-size: 15px;
}

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

.page-about .about-eco__list li {
  padding-left: 16px;
  border-left: 3px solid var(--lime);
}

.page-about .about-eco__list strong {
  display: block;
  margin-bottom: 6px;
  font-size: 15px;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-eco__list span {
  display: block;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--about-ink-soft);
}

.page-about .about-eco__frame {
  margin: 0;
  background: linear-gradient(160deg, var(--night), var(--ink));
}

@media (min-width: 960px) {
  .page-about .about-eco {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  }

  .page-about .about-eco__frame {
    margin-top: 24px;
  }
}

/* ---------- 我们看重的 ---------- */

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

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

.page-about .about-stand .panel__head .mono {
  font-size: 12px;
  font-weight: 700;
  color: var(--lime);
  letter-spacing: 0.08em;
}

.page-about .about-stand .panel__head h3 {
  margin: 0;
  font-size: clamp(16px, 2.2vw, 19px);
  font-weight: 800;
}

.page-about .about-stand .panel__body p {
  margin: 0;
  font-size: 14.5px;
}

@media (min-width: 860px) {
  .page-about .about-standards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-stand:nth-child(2) {
    margin-top: 22px;
  }
}

/* ---------- 一起做 ---------- */

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

.page-about .about-join__card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px clamp(16px, 2.6vw, 26px);
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-left: 4px solid var(--orange);
  color: var(--ink);
  text-decoration: none;
  transition: transform 120ms var(--ease), border-color 120ms var(--ease),
    box-shadow 120ms var(--ease);
}

.page-about .about-join__card:hover,
.page-about .about-join__card:focus-visible {
  transform: translateY(-4px);
  border-color: var(--lime);
  border-left-color: var(--lime);
  box-shadow: var(--shadow);
}

.page-about .about-join__card:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

.page-about .about-join__idx {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .about-join__card h3 {
  margin: 0;
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 800;
}

.page-about .about-join__card p {
  margin: 0;
  max-width: none;
  font-size: 14.5px;
}

.page-about .about-join__go {
  margin-top: auto;
  padding-top: 4px;
  font-family: var(--mono);
  font-size: 12.5px;
  font-weight: 700;
  color: var(--orange-deep);
}

.page-about .about-join__card:hover .about-join__go,
.page-about .about-join__card:focus-visible .about-join__go {
  color: var(--ink);
}

@media (min-width: 900px) {
  .page-about .about-join {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-join__card:nth-child(2) {
    margin-top: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-join__card,
  .page-about .about-tl__sum::after,
  .page-about .about-toc__list a {
    transition: none;
  }

  .page-about .about-join__card:hover,
  .page-about .about-join__card:focus-visible {
    transform: none;
  }
}
<<<END>>>
</main>