.page-about {
  position: relative;
  isolation: isolate;
  background: var(--ink-900);
  color: var(--text);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: min(72vh, 640px);
  background:
    radial-gradient(58% 78% at 80% 0%, rgba(123, 97, 255, 0.20), transparent 70%),
    radial-gradient(52% 70% at 10% 6%, rgba(40, 224, 255, 0.14), transparent 72%);
  pointer-events: none;
  z-index: -1;
}

.page-about .rig-breadcrumb {
  padding-top: clamp(16px, 3vw, 28px);
}

/* ---------- 刊头 ---------- */
.page-about .ab-masthead {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  padding: clamp(26px, 5vw, 60px) 0 clamp(24px, 4vw, 40px);
  border-bottom: var(--bd) solid var(--line);
}

.page-about .ab-title {
  margin: 12px 0 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(34px, 7.4vw, 92px);
  line-height: 1.02;
  letter-spacing: -0.035em;
  color: var(--text);
  text-wrap: balance;
}

.page-about .ab-lead {
  margin-top: 20px;
  max-width: 60ch;
  color: var(--muted);
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
}

.page-about .ab-slice {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: var(--bd) solid var(--line);
  box-shadow: var(--shadow-hard);
  align-self: end;
}

.page-about .ab-slice__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 16px 18px;
  background: var(--ink-800);
}

.page-about .ab-slice__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.2vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .ab-slice__item:nth-child(3) .ab-slice__num {
  color: var(--lime);
}

.page-about .ab-slice__label {
  font-size: 11px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 氛围图 ---------- */
.page-about .ab-ambient {
  margin: clamp(22px, 4vw, 38px) 0 0;
}

.page-about .ab-ambient img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.05);
}

/* ---------- 通用区块 ---------- */
.page-about .ab-section {
  padding: clamp(36px, 6vw, 80px) 0;
  border-bottom: var(--bd) solid var(--line-soft);
}

.page-about .ab-h2 {
  margin: 10px 0 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(25px, 3.4vw, 42px);
  line-height: 1.14;
  letter-spacing: -0.025em;
  color: var(--text);
}

.page-about .ab-h2--sm {
  font-size: clamp(21px, 2.4vw, 29px);
  line-height: 1.2;
}

.page-about .ab-body {
  margin: 14px 0 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .ab-split {
  display: grid;
  gap: clamp(28px, 4vw, 46px);
}

/* ---------- 团队 ---------- */
.page-about .ab-team__list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  border-top: var(--bd) solid var(--line);
}

.page-about .ab-team__item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-bottom: var(--bd) solid var(--line);
  transition: border-color 160ms var(--ease);
}

.page-about .ab-team__item:hover,
.page-about .ab-team__item:focus-within {
  border-bottom-color: var(--cyan);
}

.page-about .ab-team__num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 700;
  line-height: 1;
  color: var(--line);
  transition: color 160ms var(--ease);
}

.page-about .ab-team__item:hover .ab-team__num {
  color: var(--cyan);
}

.page-about .ab-team__name {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--text);
}

.page-about .ab-team__desc {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .ab-team__foot {
  margin: 22px 0 0;
  padding: 14px 16px;
  border-left: 3px solid var(--lime);
  background: rgba(16, 38, 66, 0.72);
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  padding: clamp(18px, 3vw, 26px);
  border: var(--bd) solid var(--line);
  background: linear-gradient(180deg, rgba(16, 38, 66, 0.9), rgba(11, 24, 48, 0.9));
  box-shadow: var(--shadow-hard);
}

.page-about .ab-timeline__intro {
  margin: 12px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .ab-tlfig {
  margin: 18px 0 0;
}

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

.page-about .ab-tl {
  list-style: none;
  margin: 20px 0 0;
  padding: 0 0 0 20px;
  border-left: var(--bd) solid var(--line);
  display: grid;
  gap: 12px;
}

.page-about .ab-tl__item {
  position: relative;
}

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 15px;
  width: 10px;
  height: 10px;
  background: var(--ink-900);
  border: var(--bd) solid var(--line);
  transform: rotate(45deg);
}

.page-about .ab-tl__item--current::before {
  background: var(--lime);
  border-color: var(--lime);
  box-shadow: 0 0 0 4px rgba(200, 255, 61, 0.16);
}

.page-about .ab-tl__item details {
  border: var(--bd) solid var(--line-soft);
  background: var(--ink-800);
  transition: border-color 160ms var(--ease);
}

.page-about .ab-tl__item details[open] {
  border-color: var(--cyan);
}

.page-about .ab-tl__item summary {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 11px 13px;
  cursor: pointer;
  list-style: none;
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
}

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

.page-about .ab-tl__item summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--muted);
}

.page-about .ab-tl__item details[open] summary::after {
  content: "−";
  color: var(--cyan);
}

.page-about .ab-tl__ver {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-about .ab-tl__item--current .ab-tl__ver {
  color: var(--ink-900);
  background: var(--lime);
  padding: 1px 6px;
}

.page-about .ab-tl__name {
  font-weight: 700;
  letter-spacing: 0.01em;
}

.page-about .ab-tl__body {
  padding: 0 13px 13px;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .ab-timeline__more {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 流程 ---------- */
.page-about .ab-flow__grid {
  display: grid;
  gap: clamp(22px, 4vw, 38px);
  margin-top: clamp(22px, 4vw, 34px);
}

.page-about .ab-flow__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: var(--bd) solid var(--line);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-flow__step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 16px 16px 18px;
  background: var(--ink-800);
  transition: background-color 180ms var(--ease);
}

.page-about .ab-flow__step:hover {
  background: var(--panel);
}

.page-about .ab-flow__idx {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--ink-900);
  background: var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
}

.page-about .ab-flow__step:last-child .ab-flow__idx {
  background: var(--lime);
}

.page-about .ab-flow__name {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

.page-about .ab-flow__desc {
  margin: 7px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .ab-flowfig {
  margin: 0;
}

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

/* ---------- 联系 ---------- */
.page-about .ab-links {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: var(--bd) solid var(--line);
}

.page-about .ab-links li {
  padding: 12px 0;
  border-bottom: var(--bd) solid var(--line);
  font-size: 14px;
}

.page-about .ab-contact__panel {
  padding: clamp(18px, 3vw, 28px);
  border: var(--bd) solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-contact__title {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .ab-contact__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-contact__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 5px 10px;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-soft);
}

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

.page-about .ab-contact__k {
  grid-column: 1 / -1;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .ab-contact__v {
  font-size: 14px;
  line-height: 1.6;
  color: var(--text);
  overflow-wrap: anywhere;
}

.page-about .ab-copy {
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  background: transparent;
  border: var(--bd) solid var(--line);
  cursor: pointer;
  transition: color 140ms var(--ease), border-color 140ms var(--ease);
}

.page-about .ab-copy:hover,
.page-about .ab-copy:focus-visible {
  color: var(--cyan-soft);
  border-color: var(--cyan);
}

.page-about .ab-copy[data-state="copied"] {
  color: var(--lime);
  border-color: var(--lime);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .ab-team__item {
    grid-template-columns: 60px minmax(0, 1fr);
    gap: 18px;
    padding: 20px 0;
  }

  .page-about .ab-flow__step {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 16px;
    padding: 18px 20px 20px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-masthead {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .ab-flow__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-about .ab-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .ab-timeline {
    position: sticky;
    top: 88px;
    max-height: calc(100vh - 112px);
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--line) transparent;
  }

  .page-about .ab-timeline::-webkit-scrollbar {
    width: 6px;
  }

  .page-about .ab-timeline::-webkit-scrollbar-thumb {
    background: var(--line);
  }
}

@media (max-width: 420px) {
  .page-about .ab-slice {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .ab-slice__item {
    flex-direction: row;
    align-items: baseline;
    gap: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-team__item,
  .page-about .ab-team__num,
  .page-about .ab-flow__step,
  .page-about .ab-tl__item details,
  .page-about .ab-copy {
    transition: none;
  }
}
<<<END>>>