.page-about {
  --ab-gutter: 20px;
  --ab-rail-w: 180px;
  --ab-rail-gap: 48px;
  background: var(--paper);
  color: var(--ink);
  overflow-x: hidden;
}

@media (min-width: 720px) {
  .page-about { --ab-gutter: 32px; }
}

@media (min-width: 1100px) {
  .page-about { --ab-gutter: 44px; }
}

/* ---------- 首屏框景 ---------- */

.page-about .ab-hero {
  position: relative;
  background:
    radial-gradient(130% 150% at 100% 0%, rgba(36, 69, 110, .92) 0%, rgba(18, 35, 63, 1) 62%),
    var(--navy-900);
  color: var(--paper);
  padding: 42px 0 0;
  border-bottom: 1px solid rgba(201, 162, 39, .3);
  overflow: hidden;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(244, 241, 234, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(244, 241, 234, .045) 1px, transparent 1px);
  background-size: 46px 46px;
  pointer-events: none;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 58%;
  background: linear-gradient(180deg, var(--red) 0%, var(--red) 62%, rgba(200, 50, 43, 0) 100%);
  pointer-events: none;
}

.page-about .ab-hero-inner {
  position: relative;
  z-index: 1;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--ab-gutter);
  display: grid;
  gap: 32px;
  align-items: center;
}

@media (min-width: 960px) {
  .page-about .ab-hero-inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.12fr);
    gap: 56px;
    align-items: center;
  }
}

.page-about .ab-hero-copy .kicker {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--gold);
  padding: 5px 12px;
  border: 1px solid rgba(201, 162, 39, .42);
  border-radius: 999px;
  margin: 0 0 20px;
}

.page-about .ab-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 4.6vw, 50px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--paper);
  margin: 0 0 20px;
}

.page-about .ab-hero-lead {
  font-size: 15.5px;
  line-height: 1.82;
  color: rgba(244, 241, 234, .8);
  max-width: 46ch;
  margin: 0 0 28px;
}

@media (min-width: 960px) {
  .page-about .ab-hero-lead {
    font-size: 16.5px;
  }
}

.page-about .ab-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-hero-media {
  margin: 0;
  border: 1px solid rgba(244, 241, 234, .18);
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 3 / 2;
  background: rgba(36, 69, 110, .5);
  box-shadow: 0 32px 64px -40px rgba(0, 0, 0, .8);
}

.page-about .ab-hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.page-about .ab-hero-media .media-caption {
  position: absolute;
  left: 14px;
  bottom: 12px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: rgba(244, 241, 234, .7);
  border-left: 2px solid var(--gold);
  padding-left: 9px;
}

.page-about .ab-hero-media {
  position: relative;
}

.page-about .ab-hero-facts {
  position: relative;
  z-index: 1;
  list-style: none;
  max-width: var(--maxw);
  margin: 40px auto 0;
  padding: 24px var(--ab-gutter) 30px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 18px;
  border-top: 1px solid rgba(244, 241, 234, .14);
}

@media (min-width: 900px) {
  .page-about .ab-hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 26px;
    margin-top: 48px;
  }
}

.page-about .ab-hero-facts li {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding-left: 13px;
  border-left: 2px solid rgba(201, 162, 39, .55);
  min-width: 0;
}

.page-about .ab-fact-num {
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--paper);
  line-height: 1.2;
}

@media (min-width: 700px) {
  .page-about .ab-fact-num {
    font-size: 22px;
  }
}

.page-about .ab-fact-label {
  font-size: 12.5px;
  line-height: 1.55;
  color: rgba(244, 241, 234, .64);
}

/* ---------- 左栏 + 正文骨架 ---------- */

.page-about .ab-shell {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 44px var(--ab-gutter) 68px;
  display: block;
}

@media (min-width: 1024px) {
  .page-about .ab-shell {
    display: grid;
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    gap: var(--ab-rail-gap);
    align-items: start;
    padding: 72px var(--ab-gutter) 100px;
  }
}

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

@media (min-width: 1024px) {
  .page-about .ab-rail {
    display: block;
    position: sticky;
    top: calc(var(--header-h-compact) + 30px);
    align-self: start;
    padding-top: 4px;
  }
}

.page-about .ab-rail-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--grey);
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-dark);
}

.page-about .ab-rail-nav {
  display: grid;
  gap: 2px;
}

.page-about .ab-rail-link {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding: 9px 0 9px 11px;
  border-left: 2px solid var(--line-dark);
  text-decoration: none;
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.45;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .ab-rail-link:hover,
.page-about .ab-rail-link:focus-visible {
  color: var(--navy-900);
  border-left-color: var(--gold);
  background: var(--navy-veil);
  outline: none;
}

.page-about .ab-rail-link.is-active {
  color: var(--navy-900);
  font-weight: 600;
  border-left-color: var(--red);
  background: rgba(200, 50, 43, .05);
}

.page-about .ab-rail-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--grey);
}

.page-about .ab-rail-link.is-active .ab-rail-num {
  color: var(--red);
}

.page-about .ab-body {
  counter-reset: ab-sec 0;
  min-width: 0;
}

/* ---------- 章节 ---------- */

.page-about .ab-section {
  counter-increment: ab-sec;
  position: relative;
  padding-bottom: 8px;
  scroll-margin-top: calc(var(--header-h-compact) + 26px);
}

.page-about .ab-section + .ab-section {
  margin-top: 52px;
  padding-top: 44px;
  border-top: 1px dashed var(--line-dark);
}

.page-about .ab-section + .ab-section::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 52px;
  height: 2px;
  background: var(--red);
}

.page-about .ab-section-head {
  display: grid;
  gap: 8px;
  margin-bottom: 22px;
}

@media (min-width: 780px) {
  .page-about .ab-section-head {
    grid-template-columns: 68px minmax(0, 1fr);
    gap: 20px;
    align-items: start;
    margin-bottom: 26px;
  }
}

.page-about .ab-section-num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--gold-deep);
  padding-top: 8px;
}

.page-about .ab-section-num::before {
  content: counter(ab-sec, decimal-leading-zero);
}

.page-about .ab-section h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 2.5vw, 30px);
  line-height: 1.3;
  letter-spacing: -0.015em;
  color: var(--navy-900);
  margin: 0;
}

.page-about .ab-section-body p {
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink-soft);
  margin: 0 0 1.05em;
  max-width: 66ch;
}

.page-about .ab-section-body p:last-child {
  margin-bottom: 0;
}

.page-about .ab-note {
  margin: 26px 0 0;
  padding: 14px 18px;
  background: var(--navy-veil);
  border-left: 3px solid var(--gold);
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--ink-soft);
}

@media (min-width: 780px) {
  .page-about .ab-note {
    max-width: 47ch;
    margin-left: auto;
    margin-right: 0;
  }
}

/* ---------- 阶段卡 ---------- */

.page-about .ab-phases {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

@media (min-width: 660px) {
  .page-about .ab-phases {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (min-width: 1080px) {
  .page-about .ab-phases {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
  .page-about .ab-phase:nth-child(2) {
    margin-top: 26px;
  }
}

.page-about .ab-phase {
  position: relative;
  background: var(--paper-2);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  padding: 24px 20px 20px;
  box-shadow: var(--shadow-1);
  min-width: 0;
}

.page-about .ab-phase::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 20px;
  width: 30px;
  height: 3px;
  background: var(--gold);
}

.page-about .ab-phase-mark {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--red);
  margin-bottom: 10px;
}

.page-about .ab-phase h3 {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.42;
  color: var(--navy-900);
  margin: 0 0 12px;
}

.page-about .ab-phase p {
  font-size: 14px;
  line-height: 1.76;
  color: var(--ink-soft);
  margin: 0 0 .85em;
}

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

/* ---------- 团队 ---------- */

.page-about .ab-team-grid {
  display: grid;
  gap: 28px;
}

@media (min-width: 880px) {
  .page-about .ab-team-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, .84fr);
    gap: 40px;
    align-items: start;
  }
}

.page-about .ab-team-copy p {
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink-soft);
  margin: 0 0 1.05em;
}

.page-about .ab-team-roles {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .ab-team-role {
  display: grid;
  gap: 7px;
  padding: 15px 0;
  border-top: 1px solid var(--line-dark);
}

@media (min-width: 540px) {
  .page-about .ab-team-role {
    grid-template-columns: 136px minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }
}

.page-about .ab-team-role:last-child {
  border-bottom: 1px solid var(--line-dark);
}

.page-about .ab-team-role-name {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--gold-deep);
  font-weight: 600;
}

.page-about .ab-team-role-desc {
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--ink-soft);
  margin: 0;
}

.page-about .ab-team-media {
  margin: 0;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 2 / 1;
  background: var(--index);
}

.page-about .ab-team-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.page-about .ab-team-media .media-caption {
  margin: 0;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--grey);
  border-left: 2px solid var(--gold);
  background: var(--paper-2);
}

/* ---------- 季度复核 ---------- */

.page-about .ab-review-grid {
  display: grid;
  gap: 26px;
}

@media (min-width: 820px) {
  .page-about .ab-review-grid {
    grid-template-columns: minmax(0, 1.42fr) minmax(0, 1fr);
    gap: 42px;
    align-items: start;
  }
}

.page-about .ab-review-copy p {
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink-soft);
  margin: 0 0 1.05em;
}

.page-about .ab-review-copy p:last-child {
  margin-bottom: 0;
}

.page-about .ab-metrics {
  display: grid;
  gap: 12px;
}

@media (min-width: 820px) {
  .page-about .ab-metrics {
    margin-top: 4px;
  }
}

.page-about .ab-metric {
  padding: 17px 19px;
  background: var(--navy-900);
  color: var(--paper);
  border-radius: var(--radius);
  border-left: 3px solid var(--gold);
}

.page-about .ab-metric:nth-child(2) {
  background: var(--navy-800);
  border-left-color: var(--red);
}

.page-about .ab-metric:nth-child(3) {
  background: var(--navy-700);
  border-left-color: rgba(201, 162, 39, .7);
}

.page-about .ab-metric-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.005em;
  color: var(--paper);
  margin-bottom: 7px;
  line-height: 1.3;
}

.page-about .ab-metric-label {
  display: block;
  font-size: 12.5px;
  line-height: 1.6;
  color: rgba(244, 241, 234, .68);
}

/* ---------- 合作共建 ---------- */

.page-about .ab-collab-grid {
  display: grid;
  gap: 28px;
}

@media (min-width: 880px) {
  .page-about .ab-collab-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .82fr);
    gap: 42px;
    align-items: start;
  }
}

.page-about .ab-collab-copy p {
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink-soft);
  margin: 0 0 1.05em;
}

.page-about .ab-collab-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-collab-item {
  display: grid;
  gap: 6px;
  padding: 13px 16px;
  background: var(--index);
  border-radius: var(--radius-sm);
  border-left: 2px solid var(--gold);
  transition: background-color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .ab-collab-item:hover,
.page-about .ab-collab-item:focus-within {
  background: rgba(227, 230, 235, .85);
  border-left-color: var(--red);
}

@media (min-width: 540px) {
  .page-about .ab-collab-item {
    grid-template-columns: 68px minmax(0, 1fr);
    gap: 14px;
    align-items: baseline;
  }
}

.page-about .ab-collab-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--red);
  font-weight: 600;
}

.page-about .ab-collab-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-about .ab-collab-media {
  margin: 0;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 10 / 7;
  background: var(--index);
}

.page-about .ab-collab-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.page-about .ab-collab-media .media-caption {
  margin: 0;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--grey);
  border-left: 2px solid var(--gold);
  background: var(--paper-2);
}

/* ---------- 主张收束 ---------- */

.page-about .ab-claim {
  padding-bottom: 4px;
}

.page-about .ab-claim-lead {
  font-size: 17px;
  line-height: 1.8;
  color: var(--ink);
  max-width: 56ch;
  margin: 0 0 26px;
  padding-left: 18px;
  border-left: 3px solid var(--red);
}

@media (min-width: 780px) {
  .page-about .ab-claim-lead {
    font-size: 18.5px;
  }
}

.page-about .ab-claim-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 通用收敛 ---------- */

.page-about .ab-shell img,
.page-about .ab-shell figure {
  max-width: 100%;
}

.page-about .ab-shell a:focus-visible,
.page-about .ab-shell button:focus-visible {
  outline: 2px solid var(--red);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-rail-link,
  .page-about .ab-collab-item,
  .page-about .ab-metric {
    transition: none;
  }
}
<<<END>>>