.page-about {
  --about-gap: clamp(20px, 4vw, 44px);
  --about-card-pad: clamp(20px, 3.2vw, 40px);
  position: relative;
  padding-top: var(--header-gap);
  color: var(--silver);
  font-family: var(--font-body);
  background:
    radial-gradient(80% 42% at 86% -4%, rgba(255, 122, 26, 0.16), transparent 62%),
    radial-gradient(64% 40% at 0% 18%, rgba(24, 214, 176, 0.09), transparent 66%),
    linear-gradient(180deg, var(--ink-0) 0%, var(--ink-1) 38%, var(--ink-0) 100%);
  overflow-x: clip;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  color: var(--white);
  margin: 0;
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: clamp(20px, 4vw, 48px) var(--gutter) 0;
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-hero-copy .eyebrow {
  margin: clamp(18px, 3vw, 30px) 0 0;
}

.page-about h1 {
  font-weight: 900;
  font-size: clamp(38px, 8.6vw, 92px);
  line-height: 1.03;
  letter-spacing: -0.03em;
  margin: 16px 0 20px;
  max-width: 15em;
}

.page-about h1 .hl {
  color: var(--orange);
}

.page-about .about-lede {
  font-size: clamp(15px, 1.7vw, 18px);
  line-height: 1.8;
  max-width: 46ch;
  margin: 0;
  color: var(--silver);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-hero-figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-1);
  box-shadow: var(--island-shadow);
}

.page-about .about-hero-figure .media-frame-caption {
  padding: 12px 16px;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--silver);
  opacity: 0.78;
}

/* ---------- 数据条 ---------- */
.page-about .about-hero-stats {
  max-width: var(--page-max);
  margin: clamp(30px, 5vw, 56px) auto 0;
  padding: clamp(20px, 3vw, 28px) var(--gutter) 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 24px;
  border-top: 1px solid var(--line);
}

.page-about .stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .stat-value {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 0;
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(26px, 3.4vw, 42px);
  line-height: 1;
  color: var(--white);
}

.page-about .stat:nth-child(1) .stat-num {
  color: var(--orange);
}

.page-about .stat:nth-child(4) .stat-num {
  color: var(--teal);
}

.page-about .stat-unit {
  font-size: 13px;
  color: var(--silver);
  opacity: 0.8;
}

.page-about .stat-label {
  font-size: 12.5px;
  letter-spacing: 0.16em;
  color: var(--silver);
  opacity: 0.72;
}

/* ---------- 主体三段式 ---------- */
.page-about .about-body {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: clamp(40px, 7vw, 84px) var(--gutter) clamp(36px, 5vw, 60px);
  display: grid;
  gap: clamp(20px, 3vw, 40px);
}

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

.page-about .rail-title {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--silver);
  opacity: 0.7;
}

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

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

.page-about .rail-list a {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--line);
  border-radius: 12px;
  text-decoration: none;
  color: var(--silver);
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .rail-list a:hover,
.page-about .rail-list a:focus-visible {
  color: var(--white);
  border-color: var(--line);
  border-left-color: var(--teal);
  background: rgba(20, 34, 53, 0.75);
  outline: none;
}

.page-about .rail-idx {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--teal);
  letter-spacing: 0.08em;
}

.page-about .rail-label {
  font-size: 13px;
}

.page-about .about-flow {
  display: grid;
  gap: clamp(18px, 3vw, 34px);
  min-width: 0;
}

/* ---------- 章节卡 ---------- */
.page-about .about-stage {
  position: relative;
  padding: var(--about-card-pad);
  background: var(--ink-1);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  min-width: 0;
}

.page-about .about-stage--plain {
  background: transparent;
  border-color: transparent;
  padding-left: 0;
  padding-right: 0;
}

.page-about .about-stage--teal {
  background: linear-gradient(160deg, rgba(24, 214, 176, 0.1), rgba(14, 22, 36, 0.96) 58%);
  border-color: rgba(24, 214, 176, 0.28);
}

.page-about .about-stage--gold {
  background: linear-gradient(140deg, rgba(255, 200, 87, 0.15), rgba(183, 122, 30, 0.1) 52%, rgba(14, 22, 36, 0.96) 100%);
  border-color: rgba(255, 200, 87, 0.34);
}

.page-about .stage-idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--orange);
  margin-bottom: 12px;
}

.page-about .about-stage h2 {
  font-weight: 800;
  font-size: clamp(23px, 3.2vw, 40px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  max-width: 20em;
}

.page-about .about-stage p {
  margin: 0 0 14px;
  line-height: 1.8;
  font-size: clamp(15px, 1.5vw, 16.5px);
}

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

.page-about .stage-lead {
  color: var(--silver);
  opacity: 0.92;
  max-width: 52ch;
}

.page-about .stage-points {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .stage-points li {
  position: relative;
  padding-left: 20px;
  line-height: 1.75;
  font-size: 15px;
}

.page-about .stage-points li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 10px;
  width: 7px;
  height: 7px;
  background: var(--orange);
  border-radius: 2px;
  transform: rotate(45deg);
}

.page-about .about-stage--teal .stage-points li::before,
.page-about .about-stage--gold .stage-points li::before {
  background: var(--teal);
}

.page-about .stage-points strong {
  color: var(--white);
  font-weight: 700;
  margin-right: 6px;
}

.page-about .stage-foot {
  margin-top: 20px;
  font-size: 14px;
  color: var(--silver);
  opacity: 0.9;
}

.page-about .link-arrow {
  color: var(--orange);
  text-decoration: none;
  font-weight: 600;
  border-bottom: 1px solid rgba(255, 122, 26, 0.45);
  padding-bottom: 1px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .link-arrow:hover,
.page-about .link-arrow:focus-visible {
  color: var(--white);
  border-bottom-color: var(--white);
  outline: none;
}

/* ---------- 业务线层叠目录 ---------- */
.page-about .line-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .line-list li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  padding: 16px 14px;
  background: rgba(20, 34, 53, 0.62);
  border-left: 2px solid transparent;
  transition: background 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .line-list li:first-child {
  border-radius: 14px 14px 4px 4px;
}

.page-about .line-list li:last-child {
  border-radius: 4px 4px 14px 14px;
}

.page-about .line-list li:hover {
  background: rgba(20, 34, 53, 0.95);
  border-left-color: var(--orange);
}

.page-about .line-idx {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--orange);
  letter-spacing: 0.1em;
  padding-top: 3px;
}

.page-about .line-body h3 {
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 6px;
}

.page-about .line-body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
}

/* ---------- 治理流程 ---------- */
.page-about .gov-flow {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .gov-step {
  position: relative;
  padding: 18px 16px 16px;
  background: rgba(24, 214, 176, 0.06);
  border: 1px solid rgba(24, 214, 176, 0.22);
  border-radius: var(--radius-card);
  transition: transform 0.22s var(--ease), background 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .gov-step:hover,
.page-about .gov-step:focus-within {
  transform: translateY(-2px);
  background: rgba(24, 214, 176, 0.13);
  border-color: var(--teal);
}

.page-about .gov-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--teal);
}

.page-about .gov-step h3 {
  font-size: 17px;
  font-weight: 800;
  margin: 8px 0 8px;
}

.page-about .gov-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
}

.page-about .about-figure {
  margin: 24px 0 0;
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-2);
}

.page-about .about-figure .media-frame-caption {
  padding: 12px 16px;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--silver);
  opacity: 0.78;
}

/* ---------- 团队筛选 ---------- */
.page-about .team-filter {
  margin-top: 22px;
}

.page-about .tf-radio {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-about .tf-labels {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.page-about .tf-labels label {
  padding: 8px 15px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line);
  background: rgba(7, 11, 18, 0.55);
  color: var(--silver);
  font-size: 13px;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: color 0.18s var(--ease), background 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .tf-labels label:hover {
  color: var(--white);
  border-color: var(--teal);
}

.page-about #tf-all:checked ~ .tf-labels label[for="tf-all"],
.page-about #tf-content:checked ~ .tf-labels label[for="tf-content"],
.page-about #tf-tech:checked ~ .tf-labels label[for="tf-tech"],
.page-about #tf-gov:checked ~ .tf-labels label[for="tf-gov"],
.page-about #tf-support:checked ~ .tf-labels label[for="tf-support"] {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink-0);
  font-weight: 700;
}

.page-about #tf-content:checked ~ .team-grid .team-card:not([data-team="content"]),
.page-about #tf-tech:checked ~ .team-grid .team-card:not([data-team="tech"]),
.page-about #tf-gov:checked ~ .team-grid .team-card:not([data-team="gov"]),
.page-about #tf-support:checked ~ .team-grid .team-card:not([data-team="support"]) {
  display: none;
}

.page-about .team-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .team-card {
  padding: 18px 16px;
  border-radius: var(--radius-card);
  border: 1px solid var(--line);
  background: rgba(20, 34, 53, 0.7);
  min-width: 0;
}

.page-about .team-count {
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  color: var(--teal);
  display: block;
}

.page-about .team-card h3 {
  font-size: 16px;
  font-weight: 800;
  margin: 10px 0 8px;
}

.page-about .team-card p {
  margin: 0 0 8px;
  font-size: 14px;
  line-height: 1.7;
}

.page-about .team-card .team-impact {
  margin: 0;
  color: var(--silver);
  opacity: 0.86;
  border-top: 1px solid var(--line);
  padding-top: 8px;
}

/* ---------- 会员 ---------- */
.page-about .tier-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .tier-list li {
  padding: 16px;
  border-radius: var(--radius-card);
  border: 1px solid rgba(255, 200, 87, 0.3);
  background: rgba(7, 11, 18, 0.52);
}

.page-about .tier-name {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  color: var(--gold);
  letter-spacing: 0.04em;
  margin-bottom: 6px;
}

.page-about .tier-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
}

.page-about .perk-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}

.page-about .perk-list li {
  padding: 8px 15px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(255, 200, 87, 0.42);
  background: rgba(7, 11, 18, 0.6);
  color: var(--gold);
  font-size: 13.5px;
}

/* ---------- 收尾 ---------- */
.page-about .about-next {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0 var(--gutter) clamp(48px, 7vw, 92px);
}

.page-about .about-next-inner {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: clamp(22px, 3.6vw, 44px);
  background: linear-gradient(120deg, rgba(255, 122, 26, 0.14), rgba(14, 22, 36, 0.94) 62%);
}

.page-about .about-next-copy h2 {
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.page-about .about-next-copy p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  max-width: 56ch;
}

.page-about .about-next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

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

  .page-about .gov-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .tier-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: end;
  }

  .page-about .about-body {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 68px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 110px;
    align-self: start;
  }

  .page-about .rail-list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .rail-list li + li {
    margin-top: 4px;
  }

  .page-about .rail-list a {
    display: grid;
    grid-template-columns: 26px minmax(0, 1fr);
    align-items: baseline;
    gap: 8px;
    white-space: normal;
    padding: 10px 12px;
    border-radius: 0 12px 12px 0;
    background: transparent;
  }

  .page-about .about-stage--plain {
    padding-left: 0;
    padding-top: 0;
  }

  .page-about .gov-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .gov-step::after {
    content: "";
    position: absolute;
    top: 34px;
    right: -14px;
    width: 12px;
    height: 0;
    border-top: 1px dashed rgba(24, 214, 176, 0.55);
  }

  .page-about .gov-step:last-child::after {
    display: none;
  }

  .page-about .tier-list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .about-next-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
  }

  .page-about .about-next-actions {
    margin-top: 0;
    flex: 0 0 auto;
  }
}

@media (min-width: 1200px) {
  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .gov-step,
  .page-about .line-list li,
  .page-about .rail-list a,
  .page-about .tf-labels label {
    transition: none;
  }

  .page-about .gov-step:hover,
  .page-about .gov-step:focus-within {
    transform: none;
  }
}
<<<END>>>