.page-about {
  background: var(--ok-deep);
  color: var(--ok-fog);
  font-family: var(--ok-font-sans);
  overflow-x: hidden;
}

.page-about a {
  color: var(--ok-mist);
  text-decoration: none;
  border-bottom: 1px solid rgba(143, 248, 225, 0.32);
  transition: color var(--ok-t), border-color var(--ok-t);
}

.page-about a:hover,
.page-about a:focus-visible {
  color: var(--ok-mint);
  border-bottom-color: var(--ok-line-strong);
}

/* ---------- 首屏封面 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: clamp(26px, 5vw, 56px) 0 clamp(34px, 6vw, 70px);
  overflow: hidden;
  background:
    radial-gradient(820px 520px at 88% -12%, rgba(46, 242, 196, 0.16), transparent 62%),
    radial-gradient(620px 440px at -8% 18%, rgba(255, 177, 59, 0.1), transparent 60%),
    var(--ok-deep);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(143, 248, 225, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(143, 248, 225, 0.07) 1px, transparent 1px);
  background-size: 66px 66px;
  -webkit-mask-image: radial-gradient(120% 92% at 70% 0%, #000 18%, transparent 78%);
  mask-image: radial-gradient(120% 92% at 70% 0%, #000 18%, transparent 78%);
  pointer-events: none;
}

.page-about .ab-hero .ok-container {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero__title {
  margin: 14px 0 0;
  max-width: 17ch;
  font-size: clamp(1.95rem, 6vw, 4rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--ok-fog);
}

.page-about .ab-hero__lead {
  margin: clamp(16px, 2.6vw, 24px) 0 0;
  max-width: 62ch;
  font-size: clamp(0.98rem, 1.5vw, 1.1rem);
  line-height: 1.8;
  color: var(--ok-ink-soft);
}

.page-about .ab-index {
  list-style: none;
  margin: clamp(22px, 4vw, 34px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .ab-index li {
  margin: 0;
}

.page-about .ab-index a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--ok-line);
  border-radius: 999px;
  background: rgba(46, 242, 196, 0.06);
  color: var(--ok-ink-soft);
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  transition: border-color var(--ok-t), background var(--ok-t), color var(--ok-t);
}

.page-about .ab-index a:hover,
.page-about .ab-index a:focus-visible {
  border-color: var(--ok-line-strong);
  background: rgba(46, 242, 196, 0.14);
  color: var(--ok-fog);
}

.page-about .ab-index span {
  font-family: var(--ok-font-mono);
  font-size: 0.72rem;
  color: var(--ok-amber);
  letter-spacing: 0.06em;
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-chapter {
  position: relative;
  padding: clamp(36px, 5.4vw, 66px) 0;
  border-top: 1px solid var(--ok-line);
}

.page-about .ab-chapter--band {
  background: linear-gradient(180deg, rgba(11, 59, 52, 0.92), rgba(6, 42, 38, 0.55));
}

.page-about .ab-chapter__inner {
  display: grid;
  gap: clamp(16px, 3vw, 26px);
}

.page-about .ab-rail {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .ab-rail__num {
  font-family: var(--ok-font-mono);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: 0.08em;
  color: var(--ok-amber);
}

.page-about .ab-rail__tag {
  font-size: 0.74rem;
  letter-spacing: 0.22em;
  color: var(--ok-mist);
}

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

.page-about .ab-body__title {
  margin: 0 0 14px;
  font-size: clamp(1.45rem, 3.4vw, 2.3rem);
  line-height: 1.28;
  letter-spacing: -0.01em;
  font-weight: 800;
  color: var(--ok-fog);
}

.page-about .ab-body p {
  margin: 0 0 14px;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--ok-ink-soft);
}

.page-about .ab-note {
  margin: 16px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--ok-line-strong);
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--ok-sand);
}

/* ---------- 图片 ---------- */
.page-about .ab-figure {
  margin: 18px 0 0;
  border-radius: var(--ok-radius);
  overflow: hidden;
  border: 1px solid var(--ok-line);
  background: var(--ok-deep-2);
  position: relative;
}

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

.page-about .ab-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--ok-line);
  font-size: 0.76rem;
  letter-spacing: 0.05em;
  color: var(--ok-sand);
}

/* ---------- 数据条 ---------- */
.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 20px 0 0;
}

.page-about .ab-stat {
  padding: 14px 14px 12px;
  border-radius: var(--ok-radius-sm);
  border: 1px solid var(--ok-line);
  background: rgba(46, 242, 196, 0.07);
}

.page-about .ab-stat__num {
  display: block;
  font-family: var(--ok-font-mono);
  font-weight: 600;
  font-size: 1.3rem;
  color: var(--ok-amber);
  letter-spacing: 0.02em;
}

.page-about .ab-stat__label {
  display: block;
  margin-top: 6px;
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--ok-ink-soft);
}

/* ---------- 图文双栏 ---------- */
.page-about .ab-split {
  display: grid;
  gap: clamp(16px, 3vw, 30px);
  align-items: start;
}

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

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

/* ---------- 生产流程四步 ---------- */
.page-about .ab-flow {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
  counter-reset: none;
}

.page-about .ab-flow__step {
  padding: 16px 16px 14px;
  border-radius: var(--ok-radius-sm);
  border: 1px solid var(--ok-line);
  background: linear-gradient(180deg, rgba(11, 59, 52, 0.86), rgba(6, 42, 38, 0.5));
  transition: border-color var(--ok-t), transform var(--ok-t);
}

.page-about .ab-flow__step:hover {
  border-color: var(--ok-line-strong);
  transform: translateY(-2px);
}

.page-about .ab-flow__idx {
  display: inline-block;
  margin-bottom: 8px;
  font-family: var(--ok-font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--ok-mint);
}

.page-about .ab-flow__title {
  margin: 0 0 6px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--ok-fog);
}

.page-about .ab-flow__step p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--ok-ink-soft);
}

/* ---------- 团队三卡 ---------- */
.page-about .ab-roles {
  display: grid;
  gap: 12px;
  margin: 20px 0 0;
}

.page-about .ab-role {
  padding: 18px;
  border-radius: var(--ok-radius-sm);
  border: 1px solid var(--ok-line);
  background: rgba(234, 247, 242, 0.04);
  transition: border-color var(--ok-t), background var(--ok-t), box-shadow var(--ok-t);
}

.page-about .ab-role:hover,
.page-about .ab-role:focus-within {
  border-color: var(--ok-line-strong);
  background: rgba(46, 242, 196, 0.09);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.26);
}

.page-about .ab-role:focus {
  outline: none;
}

.page-about .ab-role__num {
  font-family: var(--ok-font-mono);
  font-weight: 600;
  font-size: 1.7rem;
  color: var(--ok-amber);
  line-height: 1;
}

.page-about .ab-role__title {
  margin: 10px 0 8px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ok-fog);
}

.page-about .ab-role__desc {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--ok-ink-soft);
}

/* ---------- 版本时间轴 ---------- */
.page-about .ab-tl {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  position: relative;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--ok-mint), rgba(255, 177, 59, 0.6));
}

.page-about .ab-tl__item {
  position: relative;
  padding: 0 0 18px 34px;
}

.page-about .ab-tl__item:last-child {
  padding-bottom: 0;
}

.page-about .ab-tl__dot {
  position: absolute;
  left: 0;
  top: 16px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--ok-deep);
  border: 2px solid var(--ok-mint);
  transition: background var(--ok-t), box-shadow var(--ok-t);
}

.page-about .ab-tl__card {
  padding: 14px 16px;
  border-radius: var(--ok-radius-sm);
  border: 1px solid var(--ok-line);
  background: rgba(46, 242, 196, 0.06);
  transition: border-color var(--ok-t), background var(--ok-t), transform var(--ok-t);
}

.page-about .ab-tl__item:hover .ab-tl__card {
  border-color: var(--ok-line-strong);
  background: rgba(46, 242, 196, 0.12);
  transform: translateX(3px);
}

.page-about .ab-tl__item:hover .ab-tl__dot {
  background: var(--ok-mint);
  box-shadow: 0 0 0 6px rgba(46, 242, 196, 0.13);
}

.page-about .ab-tl__ver {
  display: inline-block;
  font-family: var(--ok-font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--ok-amber);
}

.page-about .ab-tl__title {
  margin: 6px 0 6px;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--ok-fog);
}

.page-about .ab-tl__desc {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--ok-ink-soft);
}

.page-about .ab-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 22px 0 0;
}

.page-about .ab-actions .ok-btn {
  border-bottom: none;
}

/* ---------- 服务范围 ---------- */
.page-about .ab-points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-points li {
  padding: 12px 14px;
  border-left: 2px solid var(--ok-line-strong);
  background: rgba(234, 247, 242, 0.04);
  border-radius: 0 var(--ok-radius-sm) var(--ok-radius-sm) 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--ok-ink-soft);
}

.page-about .ab-points strong {
  display: block;
  margin-bottom: 4px;
  color: var(--ok-fog);
  font-weight: 700;
}

.page-about .ab-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 0;
}

/* ---------- 联系 ---------- */
.page-about .ab-contact {
  display: grid;
  gap: 10px;
  margin: 18px 0 0;
}

.page-about .ab-contact__item {
  padding: 14px 16px;
  border-radius: var(--ok-radius-sm);
  border: 1px solid var(--ok-line);
  background: rgba(234, 247, 242, 0.04);
  transition: border-color var(--ok-t);
}

.page-about .ab-contact__item:hover {
  border-color: var(--ok-line-strong);
}

.page-about .ab-contact__label {
  display: block;
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--ok-mist);
}

.page-about .ab-contact__val {
  display: block;
  margin-top: 8px;
  font-family: var(--ok-font-mono);
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--ok-fog);
  word-break: break-word;
}

.page-about .ok-mono {
  font-family: var(--ok-font-mono);
  color: var(--ok-sand);
}

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

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

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

@media (min-width: 860px) {
  .page-about .ab-chapter__inner {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: clamp(24px, 4vw, 52px);
  }

  .page-about .ab-rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    padding-left: 14px;
    border-left: 2px solid var(--ok-line);
    align-self: start;
  }

  .page-about .ab-rail__tag {
    writing-mode: vertical-rl;
    letter-spacing: 0.3em;
    font-size: 0.72rem;
  }

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

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

@media (min-width: 1000px) {
  .page-about .ab-split {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    gap: clamp(24px, 3.4vw, 40px);
  }

  .page-about .ab-split--rev {
    grid-template-columns: minmax(0, 0.94fr) minmax(0, 1.06fr);
  }

  .page-about .ab-hero__title {
    max-width: 20ch;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-flow__step,
  .page-about .ab-tl__card,
  .page-about .ab-tl__dot,
  .page-about .ab-role {
    transition: none;
  }

  .page-about .ab-flow__step:hover,
  .page-about .ab-tl__item:hover .ab-tl__card {
    transform: none;
  }
}
<<<END>>>