.page-about {
  --about-gap: clamp(44px, 6vw, 88px);
  --about-pad: clamp(18px, 3vw, 32px);
  padding-bottom: clamp(56px, 8vw, 108px);
}

/* 面包屑 */
.page-about .about-crumb-wrap {
  padding-top: clamp(20px, 3vw, 34px);
  padding-bottom: clamp(14px, 2vw, 22px);
}
.page-about .breadcrumb a {
  color: var(--text-400);
  text-decoration: none;
  transition: color .2s ease;
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible { color: var(--blue-500); }
.page-about .breadcrumb__sep { color: var(--gold-500); padding: 0 6px; }
.page-about .breadcrumb__current { color: var(--text-100); }

/* 首屏拼贴 */
.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}
.page-about .about-hero__main {
  padding: clamp(26px, 4.2vw, 54px);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(201, 162, 39, .16), transparent 58%),
    linear-gradient(168deg, var(--ink-800), var(--ink-900));
  border: 1px solid var(--steel-700);
}
.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.06;
  font-size: clamp(30px, 4.8vw, 58px);
  color: var(--text-100);
  margin: 14px 0 0;
}
.page-about .about-hero__accent {
  color: var(--gold-500);
  display: inline-block;
  position: relative;
}
.page-about .about-hero__accent::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -6px;
  height: 2px;
  background: linear-gradient(90deg, var(--gold-500), rgba(47, 168, 255, .5), transparent);
}
.page-about .about-hero__lead {
  margin: 24px 0 0;
  max-width: 50ch;
  font-size: clamp(15px, 1.3vw, 17px);
  line-height: 1.75;
  color: var(--text-100);
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__side {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 14px;
}
.page-about .about-stat {
  padding: 18px 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--steel-700);
  background: linear-gradient(180deg, rgba(30, 37, 48, .75), rgba(17, 21, 27, .9));
}
.page-about .about-stat__num {
  margin: 0;
  font-size: clamp(24px, 2.8vw, 34px);
  line-height: 1;
  color: var(--gold-500);
  letter-spacing: -0.01em;
}
.page-about .about-stat__unit {
  font-size: .5em;
  margin-left: 4px;
  color: var(--gold-200);
}
.page-about .about-stat__label {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.55;
  color: var(--text-400);
}

/* 正文框架 + 右缘注释列 */
.page-about .about-frame {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  padding-top: var(--about-gap);
}
.page-about .about-frame__main { min-width: 0; }

.page-about .about-aside { display: none; }
.page-about .about-aside__inner {
  position: sticky;
  top: calc(var(--head-h) + 26px);
  border-left: 1px solid var(--line-gold-deep);
  padding-left: 16px;
}
.page-about .about-aside__title {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--gold-500);
  text-transform: uppercase;
}
.page-about .toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 11px;
}
.page-about .toc__list a {
  display: block;
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-400);
  text-decoration: none;
  border-left: 2px solid transparent;
  padding-left: 10px;
  margin-left: -12px;
  transition: color .2s ease, border-color .2s ease;
}
.page-about .toc__list a:hover,
.page-about .toc__list a:focus-visible { color: var(--blue-500); }
.page-about .toc__list a.is-current {
  color: var(--gold-200);
  border-left-color: var(--gold-500);
}
.page-about .about-aside__foot {
  margin: 22px 0 0;
  font-size: 10px;
  letter-spacing: .14em;
  line-height: 1.9;
  color: var(--steel-700);
  color: #3d4757;
}

/* 通用章节 */
.page-about .about-sec { scroll-margin-top: calc(var(--head-h) + 26px); }
.page-about .about-sec + .about-sec { margin-top: var(--about-gap); }
.page-about .about-sec__head {
  position: relative;
  padding-left: clamp(0px, 3vw, 42px);
  max-width: 62ch;
}
.page-about .sec-num {
  display: inline-block;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--gold-500);
  margin-bottom: 10px;
}
.page-about .about-sec__title {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  font-size: clamp(23px, 3.1vw, 38px);
  line-height: 1.16;
  color: var(--text-100);
  margin: 0;
}
.page-about .about-sec__note {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-400);
}

/* 时间轴 */
.page-about .timeline {
  list-style: none;
  margin: clamp(26px, 4vw, 46px) 0 0;
  padding: 0;
  position: relative;
}
.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 21px;
  top: 8px;
  bottom: 24px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold-500), var(--steel-700) 62%, transparent);
}
.page-about .tl-node {
  position: relative;
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 14px;
  padding: 0 0 clamp(26px, 4vw, 46px) 0;
  outline: none;
}
.page-about .tl-node:last-child { padding-bottom: 0; }
.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--gold-500);
  box-shadow: 0 0 0 4px rgba(201, 162, 39, .1);
  transition: background .25s ease, box-shadow .25s ease;
}
.page-about .tl-node:focus-visible::before,
.page-about .tl-node:hover::before {
  background: var(--gold-500);
  box-shadow: 0 0 0 6px rgba(201, 162, 39, .18);
}
.page-about .tl-node:focus-visible {
  box-shadow: inset 0 0 0 2px var(--blue-500);
  border-radius: var(--radius-sm);
}
.page-about .tl-idx {
  font-size: 14px;
  letter-spacing: .06em;
  color: var(--text-400);
  padding-top: 2px;
}
.page-about .tl-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(18px, 2.1vw, 25px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--text-100);
  margin: 0;
}
.page-about .tl-text {
  margin: 10px 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-400);
}
.page-about .tl-more {
  overflow: hidden;
  max-height: 260px;
  opacity: 1;
  transition: max-height .45s ease, opacity .32s ease, margin-top .35s ease;
}
.page-about .tl-more p {
  margin: 12px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--line-gold-deep);
  font-size: 14px;
  line-height: 1.7;
  color: var(--gold-200);
  max-width: 56ch;
}

/* 图片容器 */
.page-about .about-media {
  margin: clamp(24px, 4vw, 42px) 0 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--steel-700);
  background: var(--ink-800);
}
.page-about .about-media--brand { max-width: 460px; }
.page-about .media-frame__cap {
  display: block;
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--text-400);
  padding: 10px 14px 0;
}

/* 四类内容对照板 */
.page-about .cmp-wrap {
  margin-top: 20px;
  overflow-x: auto;
  border: 1px solid var(--steel-700);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(17, 21, 27, .9), rgba(8, 10, 13, .95));
}
.page-about .cmp-table {
  width: 100%;
  min-width: 660px;
  border-collapse: collapse;
  font-size: 14px;
}
.page-about .cmp-table__cap {
  caption-side: top;
  text-align: left;
  padding: 16px 18px 12px;
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--gold-500);
}
.page-about .cmp-table th,
.page-about .cmp-table td {
  text-align: left;
  padding: 14px 18px;
  border-top: 1px solid var(--steel-700);
  vertical-align: top;
  line-height: 1.6;
}
.page-about .cmp-table thead th {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--text-400);
  border-top: none;
  white-space: nowrap;
}
.page-about .cmp-table tbody th {
  color: var(--gold-200);
  font-weight: 700;
  white-space: nowrap;
}
.page-about .cmp-table td { color: var(--text-100); }
.page-about .cmp-table tbody tr:nth-child(even) { background: rgba(30, 37, 48, .45); }
.page-about .cmp-table tbody tr {
  transition: background .22s ease;
}
.page-about .cmp-table tbody tr:hover { background: rgba(47, 168, 255, .09); }
.page-about .cmp-table a {
  color: var(--blue-500);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 168, 255, .35);
}
.page-about .cmp-table a:hover,
.page-about .cmp-table a:focus-visible { color: var(--blue-200); }

/* 团队三栏不等宽 */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 22px;
}
.page-about .team-card {
  padding: 20px 20px 22px;
  border-radius: var(--radius-md);
  border: 1px solid var(--steel-700);
  background: linear-gradient(180deg, rgba(30, 37, 48, .7), rgba(17, 21, 27, .88));
}
.page-about .team-card__tag {
  margin: 0;
  font-size: 10px;
  letter-spacing: .18em;
  color: var(--blue-500);
}
.page-about .team-card__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(18px, 2vw, 22px);
  letter-spacing: -0.01em;
  color: var(--text-100);
}
.page-about .team-card__text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-400);
}

/* 维护节奏 */
.page-about .cadence-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-gold-deep);
}
.page-about .cadence-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 20px 0;
  border-bottom: 1px solid var(--steel-700);
}
.page-about .cadence-key {
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--gold-500);
}
.page-about .cadence-val {
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-100);
  max-width: 60ch;
}

/* 访客构成 */
.page-about .aud-band {
  margin-top: 26px;
  display: grid;
  gap: 18px;
  padding: clamp(18px, 3vw, 28px);
  border-radius: var(--radius-md);
  border: 1px solid var(--steel-700);
  background: linear-gradient(120deg, rgba(17, 21, 27, .95), rgba(8, 10, 13, .95));
}
.page-about .aud-bar {
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr) 52px;
  align-items: center;
  gap: 12px;
}
.page-about .aud-bar__label {
  font-size: 13px;
  color: var(--text-400);
}
.page-about .aud-bar__track {
  display: block;
  height: 12px;
  border-radius: 99px;
  background: var(--steel-700);
  overflow: hidden;
}
.page-about .aud-bar__fill {
  display: block;
  height: 100%;
  border-radius: 99px;
}
.page-about .aud-bar__fill--desktop {
  width: 68%;
  background: linear-gradient(90deg, var(--line-gold-deep), var(--gold-500));
}
.page-about .aud-bar__fill--mobile {
  width: 32%;
  background: linear-gradient(90deg, var(--steel-700), var(--blue-500));
}
.page-about .aud-bar__val {
  font-size: 15px;
  text-align: right;
  color: var(--gold-200);
}
.page-about .aud-notes {
  margin-top: 20px;
  display: grid;
  gap: 12px;
}
.page-about .aud-note {
  margin: 0;
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-400);
  max-width: 62ch;
}
.page-about .aud-note .dot {
  margin-top: 8px;
  flex: none;
}

/* 主体与备案 */
.page-about .entity-strip {
  margin-top: 22px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  border-top: 1px solid var(--line-gold-deep);
  border-bottom: 1px solid var(--line-gold-deep);
}
.page-about .entity-item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--steel-700);
}
.page-about .entity-item:last-child { border-bottom: none; }
.page-about .entity-item__k {
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--text-400);
  min-width: 92px;
}
.page-about .entity-item__v {
  font-size: 15px;
  color: var(--text-100);
}
.page-about .entity-item__v a {
  color: var(--blue-500);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 168, 255, .35);
}
.page-about .entity-item__v a:hover,
.page-about .entity-item__v a:focus-visible { color: var(--blue-200); }

/* 收尾 */
.page-about .about-cta {
  margin-top: var(--about-gap);
  padding: clamp(24px, 4vw, 44px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--steel-700);
  background:
    radial-gradient(110% 100% at 0% 100%, rgba(47, 168, 255, .14), transparent 60%),
    linear-gradient(160deg, var(--ink-800), var(--ink-900));
}
.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  font-size: clamp(21px, 2.7vw, 32px);
  color: var(--text-100);
}
.page-about .about-cta__text {
  margin: 14px 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-400);
}
.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* 断点 */
@media (min-width: 760px) {
  .page-about .cadence-row {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
  .page-about .entity-item {
    display: grid;
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.62fr) minmax(0, 1fr);
    gap: 18px;
  }
  .page-about .about-hero__side {
    grid-template-columns: minmax(0, 1fr);
  }
  .page-about .team-grid {
    grid-template-columns: 1.15fr 1fr 0.92fr;
    gap: 16px;
    align-items: stretch;
  }
  .page-about .tl-node {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 26px;
  }
  .page-about .timeline::before { left: 39px; }
  .page-about .tl-node::before { left: 34px; }
  .page-about .tl-idx {
    font-size: 15px;
    text-align: right;
    padding-top: 3px;
  }
  .page-about .tl-more {
    max-height: 0;
    opacity: 0;
  }
  .page-about .tl-node:hover .tl-more,
  .page-about .tl-node:focus-within .tl-more {
    max-height: 260px;
    opacity: 1;
  }
}

@media (min-width: 1120px) {
  .page-about .about-frame {
    grid-template-columns: minmax(0, 1fr) 172px;
    gap: 56px;
  }
  .page-about .about-aside { display: block; }
}

@media (max-width: 420px) {
  .page-about .aud-bar {
    grid-template-columns: 66px minmax(0, 1fr) 44px;
    gap: 8px;
  }
  .page-about .cmp-table th,
  .page-about .cmp-table td { padding: 12px 12px; }
}
<<<END>>>