.page-about {
  --ab-rail-w: 232px;
  --ab-cut: 20px;
  background: var(--paper);
  color: var(--ink);
}

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

.page-about .ab-topbar {
  padding-top: clamp(14px, 2.4vw, 22px);
  padding-bottom: 4px;
}

.page-about .crumb ol {
  list-style: none;
  margin: 0;
  padding: 0;
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(158deg, var(--green) 0%, #10372C 46%, var(--navy) 100%);
  color: var(--white);
  padding: clamp(34px, 6vw, 68px) 0 clamp(40px, 7vw, 82px);
  margin-bottom: clamp(28px, 4vw, 52px);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(90deg, rgba(251, 252, 248, .055) 0 1px, transparent 1px 74px),
    repeating-linear-gradient(0deg, rgba(251, 252, 248, .055) 0 1px, transparent 1px 74px);
  pointer-events: none;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  right: -110px;
  bottom: -140px;
  width: 380px;
  height: 380px;
  background: repeating-linear-gradient(135deg, rgba(242, 106, 27, .24) 0 9px, transparent 9px 26px);
  transform: rotate(9deg);
  pointer-events: none;
}

.page-about .ab-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  align-items: end;
}

.page-about .ab-hero-copy .eyebrow {
  color: rgba(251, 252, 248, .72);
  letter-spacing: .16em;
  font-size: 12px;
  margin: 0 0 14px;
}

.page-about .ab-hero-title {
  font-family: var(--font-display);
  font-size: clamp(27px, 5.2vw, 44px);
  line-height: 1.22;
  letter-spacing: -.02em;
  font-weight: 800;
  margin: 0 0 18px;
  max-width: 20em;
}

.page-about .ab-hero-lead {
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: rgba(251, 252, 248, .86);
  max-width: 34em;
  margin: 0 0 26px;
}

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

.page-about .ab-hero-actions .btn-ghost {
  border-color: rgba(251, 252, 248, .42);
  color: var(--white);
}

.page-about .ab-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(251, 252, 248, .22);
  border: 1px solid rgba(251, 252, 248, .22);
  clip-path: polygon(0 0, calc(100% - var(--ab-cut)) 0, 100% var(--ab-cut), 100% 100%, var(--ab-cut) 100%, 0 calc(100% - var(--ab-cut)));
}

.page-about .ab-fact {
  background: rgba(14, 27, 51, .62);
  padding: 16px 14px 14px;
}

.page-about .ab-fact-num {
  margin: 0 0 6px;
  display: flex;
  align-items: baseline;
  gap: 3px;
  font-family: var(--font-data);
  font-size: clamp(24px, 3.6vw, 34px);
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--white);
  line-height: 1;
}

.page-about .ab-fact-num em {
  font-style: normal;
  font-size: .46em;
  color: var(--signal);
  letter-spacing: .06em;
}

.page-about .ab-fact-label {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: rgba(251, 252, 248, .68);
}

/* ---------- 主体布局 ---------- */

.page-about .ab-layout {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  padding-bottom: clamp(40px, 6vw, 72px);
}

.page-about .ab-rail-title {
  margin: 0 0 10px;
  font-family: var(--font-editorial);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--muted);
}

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

.page-about .ab-rail-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  white-space: nowrap;
  padding: 8px 12px;
  border: 1px solid var(--line);
  background: var(--white);
  color: var(--green);
  font-size: 13.5px;
  text-decoration: none;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
  transition: border-color .2s ease, background-color .2s ease, color .2s ease;
}

.page-about .ab-rail-link:hover,
.page-about .ab-rail-link:focus-visible {
  border-color: var(--signal);
  background: var(--paper-2);
}

.page-about .ab-rail-num {
  font-size: 11.5px;
  color: var(--muted);
  letter-spacing: .1em;
}

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

/* ---------- 章节 ---------- */

.page-about .ab-sec {
  scroll-margin-top: 96px;
  padding-block: clamp(26px, 4vw, 46px);
  border-top: 1px solid var(--line);
}

.page-about .ab-sec:first-child {
  border-top: none;
  padding-top: 0;
}

.page-about .ab-sec-num {
  margin: 0 0 8px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--signal);
  text-transform: uppercase;
}

.page-about .ab-sec-title {
  font-family: var(--font-editorial);
  font-size: clamp(20px, 2.7vw, 28px);
  line-height: 1.38;
  font-weight: 600;
  color: var(--green);
  margin: 0 0 16px;
}

.page-about .ab-sec p {
  font-size: 16.5px;
  line-height: 1.85;
  margin: 0 0 16px;
  max-width: 36em;
}

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

/* ---------- 图 ---------- */

.page-about .ab-figure {
  margin: 22px 0 0;
  max-width: 640px;
}

.page-about .ab-figure img {
  width: 100%;
  height: clamp(180px, 28vw, 300px);
  object-fit: cover;
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
}

.page-about .media-caption {
  display: block;
  margin-top: 10px;
}

.page-about .ab-band {
  margin: 20px 0 26px;
  overflow: hidden;
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
}

.page-about .ab-band img {
  width: 100%;
  height: clamp(148px, 22vw, 248px);
  object-fit: cover;
}

/* ---------- 时间轴 ---------- */

.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
  counter-reset: stage;
}

.page-about .ab-stage {
  position: relative;
  padding: 16px 16px 18px;
  background: var(--white);
  border-left: 3px solid var(--corner);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}

.page-about .ab-stage-idx {
  display: block;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--muted);
  margin-bottom: 6px;
}

.page-about .ab-stage-title {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--green);
  margin: 0 0 8px;
}

.page-about .ab-stage p {
  font-size: 15px;
  line-height: 1.78;
  margin: 0;
  color: var(--ink);
}

/* ---------- 团队 ---------- */

.page-about .ab-split {
  display: flex;
  height: 12px;
  margin: 22px 0 24px;
  gap: 2px;
  background: var(--paper-2);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
}

.page-about .ab-split-seg {
  display: block;
  height: 100%;
}

.page-about .ab-split-seg--mark { flex: 14 1 0; background: var(--corner); }
.page-about .ab-split-seg--edit { flex: 9 1 0; background: var(--cool); }
.page-about .ab-split-seg--eng { flex: 12 1 0; background: var(--green); }
.page-about .ab-split-seg--prod { flex: 11 1 0; background: var(--signal); }

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

.page-about .ab-role {
  background: var(--white);
  border: 1px solid var(--line);
  border-top: 3px solid var(--line-strong);
  padding: 16px 16px 18px;
}

.page-about .ab-role-count {
  margin: 0 0 6px;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--signal);
}

.page-about .ab-role-name {
  font-family: var(--font-display);
  font-size: 16.5px;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 8px;
}

.page-about .ab-role p {
  font-size: 15px;
  line-height: 1.78;
  margin: 0;
}

/* ---------- 履历与简史 ---------- */

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

.page-about .ab-records-body p {
  font-size: 16.5px;
  line-height: 1.85;
  margin: 0 0 16px;
  max-width: 36em;
}

.page-about .ab-records-media {
  margin: 0;
}

.page-about .ab-records-media img {
  width: 100%;
  max-width: 300px;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .ab-fold {
  margin-top: 18px;
  border: 1px solid var(--line-strong);
  background: var(--paper-2);
  max-width: 40em;
}

.page-about .ab-fold summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 13px 16px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  color: var(--green);
}

.page-about .ab-fold summary::-webkit-details-marker { display: none; }

.page-about .ab-fold summary::after {
  content: "+";
  font-family: var(--font-data);
  font-size: 18px;
  line-height: 1;
  color: var(--signal);
}

.page-about .ab-fold[open] summary::after { content: "–"; }

.page-about .ab-fold-body {
  padding: 4px 16px 18px;
  border-top: 1px dashed var(--line-strong);
}

.page-about .ab-fold-list {
  list-style: none;
  margin: 0;
  padding: 12px 0 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-fold-list li {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink);
  padding-left: 30px;
  position: relative;
}

.page-about .ab-fold-list .num {
  position: absolute;
  left: 0;
  top: 0;
  font-size: 12px;
  color: var(--cool);
  letter-spacing: .06em;
}

.page-about .ab-fold-list strong {
  color: var(--green);
  font-weight: 600;
}

/* ---------- 合作机构 ---------- */

.page-about .ab-partners {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .ab-partner {
  background: var(--white);
  padding: 18px 16px 20px;
  border-top: 3px solid var(--green);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-about .ab-partner--youth { border-top-color: var(--corner); }
.page-about .ab-partner--league { border-top-color: var(--signal); }

.page-about .ab-partner h3 {
  font-family: var(--font-display);
  font-size: 16.5px;
  font-weight: 700;
  color: var(--green);
  margin: 0 0 8px;
}

.page-about .ab-partner p {
  font-size: 15px;
  line-height: 1.78;
  margin: 0;
  max-width: none;
}

/* ---------- 节奏 ---------- */

.page-about .ab-rhythm {
  list-style: none;
  margin: 22px 0 20px;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-rhythm-item {
  padding: 14px 16px 16px;
  background: linear-gradient(90deg, rgba(20, 72, 58, .08), rgba(20, 72, 58, 0));
  border-left: 3px solid var(--green);
}

.page-about .ab-rhythm-label {
  margin: 0 0 6px;
  font-family: var(--font-data);
  font-size: 12.5px;
  letter-spacing: .14em;
  color: var(--green);
}

.page-about .ab-rhythm-text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  max-width: 36em;
}

/* ---------- 结尾行动区 ---------- */

.page-about .ab-cta {
  margin-top: clamp(26px, 4vw, 44px);
  padding: clamp(24px, 4vw, 40px);
  background: linear-gradient(150deg, var(--navy) 0%, #12304A 100%);
  color: var(--white);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 22px 100%, 0 calc(100% - 22px));
}

.page-about .ab-cta-title {
  font-family: var(--font-editorial);
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 600;
  margin: 0 0 12px;
  color: var(--white);
}

.page-about .ab-cta p {
  margin: 0 0 22px;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(251, 252, 248, .82);
  max-width: 36em;
}

.page-about .ab-cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .ab-cta-links .btn-line {
  border-color: rgba(251, 252, 248, .4);
  color: var(--white);
}

/* ---------- 断点 ---------- */

@media (min-width: 640px) {
  .page-about .ab-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .ab-timeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
    padding-top: 34px;
    position: relative;
  }

  .page-about .ab-timeline::before {
    content: "";
    position: absolute;
    top: 9px;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--cool), var(--warm));
  }

  .page-about .ab-stage {
    border-left: none;
    border-top: 3px solid var(--corner);
    padding: 16px 14px 18px;
  }

  .page-about .ab-stage::before {
    content: "";
    position: absolute;
    top: -31px;
    left: 0;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--paper);
    border: 2px solid var(--signal);
  }

  .page-about .ab-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-rhythm {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero-grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(280px, .82fr);
  }

  .page-about .ab-records {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 36px;
    align-items: start;
  }

  .page-about .ab-records-media img {
    max-width: 100%;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-layout {
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 68px);
    align-items: start;
  }

  .page-about .ab-rail {
    position: sticky;
    top: 92px;
    padding-right: 6px;
  }

  .page-about .ab-rail-list {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .ab-rail-link {
    width: 100%;
    border-color: transparent;
    border-left: 2px solid var(--line-strong);
    background: transparent;
    justify-content: flex-start;
    padding: 9px 10px;
  }

  .page-about .ab-rail-link:hover,
  .page-about .ab-rail-link:focus-visible {
    border-left-color: var(--signal);
    background: var(--paper-2);
  }
}

@media (min-width: 1180px) {
  .page-about {
    --ab-rail-w: 252px;
  }

  .page-about .ab-roles {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}
<<<END>>>