.page-about {
  --about-rail-w: 118px;
  --about-gap: 44px;
  background: var(--ink-900);
  color: var(--paper-100);
  padding-bottom: 64px;
}

.page-about .breadcrumb {
  padding: 22px 0 0;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: 30px 0 56px;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--gold-500), var(--line-600) 46%, transparent);
  opacity: 0.7;
}

.page-about .about-hero__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--teal-400);
}

.page-about .about-hero__title {
  margin: 18px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 8vw, 4.2rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--paper-100);
}

.page-about .about-hero__accent {
  display: block;
  color: var(--gold-500);
}

.page-about .about-hero__lead {
  margin: 22px 0 0;
  max-width: 44ch;
  font-size: clamp(1rem, 2.6vw, 1.1rem);
  line-height: 1.8;
  color: var(--slate-300);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 34px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__fact {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-left: 12px;
  border-left: 2px solid var(--line-600);
}

.page-about .about-hero__fact-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.34rem;
  letter-spacing: 0.02em;
  color: var(--gold-200);
}

.page-about .about-hero__fact-label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--slate-300);
}

/* ---------- 主体网格 ---------- */

.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.page-about .about-rail {
  display: none;
}

.page-about .about-flow {
  min-width: 0;
}

/* ---------- 区块 ---------- */

.page-about .about-sec {
  position: relative;
  padding: 48px 0 16px;
}

.page-about .about-sec + .about-sec::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--line-600), transparent 70%);
}

.page-about .about-sec__kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--teal-400);
}

.page-about .about-sec__no {
  color: var(--gold-500);
  letter-spacing: 0.1em;
}

.page-about .about-sec__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.45rem, 5.2vw, 2.2rem);
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--paper-100);
}

.page-about .about-sec__intro {
  margin: 16px 0 0;
  max-width: 54ch;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--slate-300);
}

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: 28px 0 0;
}

.page-about .about-figure__frame {
  border: 1px solid var(--line-600);
  border-radius: var(--radius-m);
  overflow: hidden;
  background: var(--ink-800);
}

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

.page-about .about-figure__caption {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--slate-300);
}

/* ---------- 代际列表 ---------- */

.page-about .era-list {
  margin: 26px 0 0;
}

.page-about .era {
  border-top: 1px solid var(--line-600);
}

.page-about .era:last-child {
  border-bottom: 1px solid var(--line-600);
}

.page-about .era__sum {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr) 26px;
  align-items: center;
  gap: 0 12px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .era__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gold-500);
}

.page-about .era__title {
  display: block;
  min-width: 0;
}

.page-about .era__name {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.98rem;
  line-height: 1.5;
  color: var(--paper-100);
}

.page-about .era__desc {
  display: block;
  margin-top: 4px;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--slate-300);
}

.page-about .era__plus {
  position: relative;
  justify-self: end;
  width: 16px;
  height: 16px;
}

.page-about .era__plus::before,
.page-about .era__plus::after {
  content: "";
  position: absolute;
  background: var(--teal-400);
  transition: transform 0.18s ease-out;
}

.page-about .era__plus::before {
  top: 7px;
  left: 0;
  width: 16px;
  height: 2px;
}

.page-about .era__plus::after {
  top: 0;
  left: 7px;
  width: 2px;
  height: 16px;
}

.page-about .era[open] .era__plus::after {
  transform: scaleY(0);
}

.page-about .era[open] .era__name {
  color: var(--gold-200);
}

.page-about .era__body {
  padding: 0 0 18px 52px;
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--slate-300);
}

.page-about .era__body ul {
  margin: 0;
  padding-left: 16px;
}

.page-about .era__body li {
  margin: 5px 0;
}

.page-about .era__body li::marker {
  color: var(--gold-500);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  margin-top: 28px;
}

.page-about .bar {
  margin-bottom: 22px;
}

.page-about .bar__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.page-about .bar__label {
  font-size: 0.94rem;
  color: var(--paper-100);
}

.page-about .bar__num {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--gold-500);
}

.page-about .bar__track {
  height: 10px;
  border: 1px solid var(--line-600);
  border-radius: 999px;
  background: var(--ink-700);
  overflow: hidden;
}

.page-about .bar__fill {
  display: block;
  height: 100%;
  border-radius: 999px;
}

.page-about .bar__fill--a {
  width: 100%;
  background: linear-gradient(90deg, var(--gold-500), var(--gold-200));
}

.page-about .bar__fill--b {
  width: 29%;
  background: linear-gradient(90deg, var(--teal-400), rgba(58, 203, 176, 0.45));
}

.page-about .bar__note {
  margin: 10px 0 0;
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--slate-300);
}

.page-about .about-team__note {
  margin: 26px 0 0;
  padding: 16px 18px;
  border-left: 2px solid var(--gold-500);
  background: var(--ink-800);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--slate-300);
}

/* ---------- 覆盖 ---------- */

.page-about .about-reach {
  margin-top: 26px;
}

.page-about .reach-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-600);
}

.page-about .reach-list__item {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr) auto;
  align-items: center;
  gap: 0 12px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line-600);
}

.page-about .reach-list__swatch {
  width: 10px;
  height: 10px;
  border-radius: 2px;
}

.page-about .reach-list__swatch--gold {
  background: var(--gold-500);
}

.page-about .reach-list__swatch--teal {
  background: var(--teal-400);
}

.page-about .reach-list__swatch--clay {
  background: var(--clay-500);
}

.page-about .reach-list__swatch--line {
  background: var(--line-600);
}

.page-about .reach-list__label {
  font-size: 0.9rem;
  color: var(--slate-300);
}

.page-about .reach-list__val {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--gold-200);
  text-align: right;
}

.page-about .about-industry {
  margin-top: 30px;
  padding-top: 22px;
  border-top: 1px solid var(--line-600);
}

.page-about .about-industry__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--teal-400);
}

.page-about .about-industry__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-industry__item {
  padding: 5px 12px;
  border: 1px solid var(--line-600);
  border-radius: 999px;
  font-size: 0.82rem;
  color: var(--paper-100);
  background: var(--ink-800);
}

.page-about .about-industry__text {
  margin: 18px 0 0;
  max-width: 52ch;
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--slate-300);
}

.page-about .about-link {
  color: var(--teal-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(58, 203, 176, 0.4);
  transition: color 0.15s ease-out, border-color 0.15s ease-out;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--gold-200);
  border-bottom-color: var(--gold-500);
}

/* ---------- 准则 ---------- */

.page-about .principles {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: principle;
}

.page-about .principles__item {
  position: relative;
  padding: 18px 0 18px 22px;
  border-bottom: 1px solid var(--line-600);
}

.page-about .principles__item:first-child {
  border-top: 1px solid var(--line-600);
}

.page-about .principles__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 24px;
  width: 8px;
  height: 8px;
  background: var(--gold-500);
  transform: rotate(45deg);
}

.page-about .principles__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.5;
  color: var(--paper-100);
}

.page-about .principles__text {
  margin: 8px 0 0;
  max-width: 54ch;
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--slate-300);
}

/* ---------- 长期支持 ---------- */

.page-about .about-support {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 26px;
}

.page-about .about-support__card {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "num unit"
    "label label"
    "text text";
  align-items: baseline;
  gap: 4px 8px;
  padding: 22px 20px;
  border: 1px solid var(--line-600);
  border-radius: var(--radius-m);
  background: linear-gradient(155deg, var(--ink-700), var(--ink-800));
}

.page-about .about-support__num {
  grid-area: num;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2rem, 7vw, 2.8rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold-500);
}

.page-about .about-support__unit {
  grid-area: unit;
  font-size: 0.86rem;
  color: var(--slate-300);
}

.page-about .about-support__label {
  grid-area: label;
  margin-top: 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--paper-100);
}

.page-about .about-support__text {
  grid-area: text;
  margin: 8px 0 0;
  font-size: 0.86rem;
  line-height: 1.8;
  color: var(--slate-300);
}

.page-about .about-support__note {
  margin: 24px 0 0;
  max-width: 56ch;
  font-size: 0.9rem;
  line-height: 1.9;
  color: var(--slate-300);
}

/* ---------- 桌面 ---------- */

@media (min-width: 720px) {
  .page-about .about-support {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-sec {
    padding: 64px 0 24px;
  }
}

@media (min-width: 820px) {
  .page-about .about-team {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .about-team .about-figure {
    margin-top: 0;
  }

  .page-about .about-reach {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .about-reach .about-figure {
    margin-top: 0;
  }

  .page-about .reach-list {
    align-self: start;
  }
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    column-gap: var(--about-gap);
  }

  .page-about .about-rail {
    display: block;
    position: relative;
  }

  .page-about .about-rail__inner {
    position: sticky;
    top: 132px;
    height: 340px;
    border-left: 1px solid var(--line-600);
    background-image: repeating-linear-gradient(
      to bottom,
      var(--line-600) 0 1px,
      transparent 1px 28px
    );
    background-size: 11px 28px;
    background-repeat: repeat-y;
    background-position: 0 0;
  }

  .page-about .about-rail__label {
    position: absolute;
    left: 26px;
    top: 4px;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.34em;
    color: var(--slate-300);
  }

  .page-about .about-hero {
    padding: 40px 0 70px;
  }

  .page-about .about-hero__lead {
    max-width: 52ch;
  }
}

@media (min-width: 1180px) {
  .page-about .era__sum {
    grid-template-columns: 52px minmax(0, 1fr) 26px;
    padding: 18px 0;
  }

  .page-about .era__body {
    padding-left: 64px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .era__plus::before,
  .page-about .era__plus::after,
  .page-about .about-link {
    transition: none;
  }
}
<<<END>>>