.page-about {
  --ab-cyan-soft: rgba(25, 227, 208, 0.12);
  --ab-amber-soft: rgba(245, 165, 36, 0.12);
  --ab-hair: rgba(44, 90, 117, 0.85);
  background: var(--abyss);
  color: var(--ice);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

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

.page-about .ab-eyebrow {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cyan);
}

/* 面包屑 */
.page-about .ab-crumbs {
  padding-top: 20px;
  padding-bottom: 4px;
}

.page-about .ab-crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--steel);
}

.page-about .ab-crumbs li + li::before {
  content: "／";
  margin-right: 8px;
  color: var(--line);
}

.page-about .ab-crumbs a {
  color: var(--steel);
  text-decoration: none;
}

.page-about .ab-crumbs a:hover,
.page-about .ab-crumbs a:focus-visible {
  color: var(--cyan);
}

.page-about .ab-crumbs [aria-current] {
  color: var(--ice);
}

/* 首屏 */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: 34px 0 40px;
  background:
    repeating-linear-gradient(90deg, rgba(44, 90, 117, 0.18) 0 1px, transparent 1px 128px),
    radial-gradient(120% 90% at 78% 8%, rgba(25, 227, 208, 0.16), transparent 62%),
    var(--tactical);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(140deg, rgba(6, 24, 38, 0.9) 34%, rgba(6, 24, 38, 0.2) 100%);
  clip-path: polygon(0 0, 100% 0, 100% 58%, 0 100%);
  pointer-events: none;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  right: -18%;
  top: -40%;
  width: 62%;
  aspect-ratio: 1;
  border: 1px solid rgba(25, 227, 208, 0.28);
  border-radius: 50%;
  pointer-events: none;
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero h1 {
  margin: 0;
  max-width: 15em;
  font-size: clamp(30px, 7.4vw, 62px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-weight: 900;
}

.page-about .ab-hero__lead {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(232, 241, 245, 0.86);
}

.page-about .ab-hero__lead strong {
  color: var(--cyan);
}

.page-about .ab-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 20px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-facts li {
  padding-top: 10px;
  border-top: 1px solid var(--line);
}

.page-about .ab-facts__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 600;
  line-height: 1.1;
  color: var(--amber);
}

.page-about .ab-facts__num em {
  font-style: normal;
  font-size: 16px;
  color: var(--steel);
}

.page-about .ab-facts__label {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  color: var(--steel);
}

/* 分屏骨架 */
.page-about .ab-shell {
  display: grid;
  gap: 28px;
  padding-top: 24px;
  padding-bottom: 72px;
}

/* 章节索引轨道 */
.page-about .ab-rail__title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--steel);
}

.page-about .ab-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .ab-rail__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  background: rgba(11, 43, 69, 0.6);
  color: var(--steel);
  font-size: 13px;
  white-space: nowrap;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .ab-rail__idx {
  font-size: 12px;
  color: var(--cyan);
}

.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible {
  color: var(--ice);
  border-color: var(--cyan);
  transform: translateX(3px);
}

.page-about .ab-rail__link:hover .ab-rail__idx,
.page-about .ab-rail__link:focus-visible .ab-rail__idx {
  color: var(--amber);
}

/* 章节 */
.page-about .ab-sec {
  padding: 30px 0 10px;
  border-top: 1px solid var(--line);
}

.page-about .ab-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .ab-sec__head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 16px;
}

.page-about .ab-sec__num {
  flex: none;
  font-size: 40px;
  font-weight: 600;
  line-height: 0.9;
  color: transparent;
  -webkit-text-stroke: 1.5px rgba(25, 227, 208, 0.8);
}

@supports not (-webkit-text-stroke: 1px #000) {
  .page-about .ab-sec__num {
    color: rgba(25, 227, 208, 0.55);
  }
}

.page-about .ab-sec__head h2 {
  margin: 0;
  font-size: clamp(21px, 4.6vw, 32px);
  line-height: 1.25;
  letter-spacing: -0.01em;
  font-weight: 900;
}

.page-about .ab-lead {
  margin: 0 0 20px;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(232, 241, 245, 0.82);
}

.page-about .ab-sec__grid {
  display: grid;
  gap: 22px;
}

.page-about .ab-prose p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(232, 241, 245, 0.86);
}

.page-about .ab-prose strong {
  color: var(--cyan);
  font-weight: 700;
}

.page-about .ab-points {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .ab-points li {
  position: relative;
  padding-left: 34px;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(232, 241, 245, 0.78);
}

.page-about .ab-points .mono {
  position: absolute;
  left: 0;
  top: 2px;
  font-size: 12px;
  color: var(--amber);
}

/* 图片 */
.page-about .ab-figure {
  margin: 0;
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .ab-figure figcaption {
  margin-top: 8px;
  padding-left: 10px;
  border-left: 2px solid var(--cyan);
  font-size: 12px;
  line-height: 1.6;
  color: var(--steel);
}

.page-about .ab-figure figcaption .mono {
  color: var(--cyan);
  letter-spacing: 0.06em;
  margin-right: 6px;
}

.page-about .ab-figure--wide,
.page-about .ab-figure--tall {
  margin-top: 24px;
}

/* 团队 */
.page-about .ab-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .ab-team__card {
  position: relative;
  padding: 18px 18px 20px;
  background: linear-gradient(160deg, var(--panel), rgba(11, 43, 69, 0.92));
  border: 1px solid var(--line);
  transition: transform 0.22s var(--ease), border-color 0.22s var(--ease), box-shadow 0.22s var(--ease);
}

.page-about .ab-team__card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 18px;
  width: 46px;
  height: 5px;
  background: var(--amber);
  opacity: 0.28;
  transition: opacity 0.22s var(--ease), width 0.22s var(--ease);
}

.page-about .ab-team__card:hover,
.page-about .ab-team__card:focus-within {
  transform: translateY(-4px);
  border-color: var(--amber);
  box-shadow: 0 10px 26px rgba(4, 16, 26, 0.55);
}

.page-about .ab-team__card:hover::before,
.page-about .ab-team__card:focus-within::before {
  opacity: 1;
  width: 78px;
}

.page-about .ab-team__idx {
  display: inline-block;
  margin-bottom: 8px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--steel);
}

.page-about .ab-team__card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-about .ab-team__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(232, 241, 245, 0.76);
}

.page-about .ab-rhythm {
  margin-top: 20px;
  padding: 18px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  background: rgba(18, 63, 94, 0.45);
}

.page-about .ab-rhythm__title {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .ab-rhythm p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(232, 241, 245, 0.84);
}

/* 复盘方法 */
.page-about .ab-method {
  position: relative;
  padding: 6px 16px 12px;
  border: 1px solid var(--line);
  background:
    repeating-linear-gradient(0deg, rgba(44, 90, 117, 0.14) 0 1px, transparent 1px 44px),
    rgba(11, 43, 69, 0.55);
}

.page-about .ab-method::before,
.page-about .ab-method::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  border: 1px solid var(--cyan);
  pointer-events: none;
}

.page-about .ab-method::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .ab-method::after {
  bottom: -1px;
  right: -1px;
  border-left: 0;
  border-top: 0;
}

.page-about .ab-step {
  border-bottom: 1px dashed var(--ab-hair);
}

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

.page-about .ab-step summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 15px 0;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 700;
  color: var(--ice);
  transition: color 0.2s var(--ease);
}

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

.page-about .ab-step__num {
  flex: none;
  font-size: 13px;
  color: var(--cyan);
}

.page-about .ab-step summary:hover,
.page-about .ab-step summary:focus-visible,
.page-about .ab-step[open] summary {
  color: var(--amber);
}

.page-about .ab-step[open] .ab-step__num {
  color: var(--amber);
}

.page-about .ab-step p {
  margin: 0 0 16px;
  padding-left: 30px;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(232, 241, 245, 0.8);
}

/* 时间线 */
.page-about .ab-tl {
  display: block;
  width: 100%;
  height: 34px;
  margin: 4px 0 14px;
}

.page-about .ab-time {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-time__item details {
  padding: 14px 16px;
  border: 1px solid var(--line);
  background: rgba(18, 63, 94, 0.4);
}

.page-about .ab-time__item summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 700;
  color: var(--ice);
}

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

.page-about .ab-time__item summary .mono {
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.page-about .ab-time__item summary:hover,
.page-about .ab-time__item summary:focus-visible {
  color: var(--cyan);
}

.page-about .ab-time__item p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(232, 241, 245, 0.8);
}

.page-about .ab-tl__note {
  margin: 18px 0 0;
  padding: 12px 14px;
  border-left: 3px solid var(--live);
  background: rgba(182, 255, 59, 0.06);
  font-size: 13px;
  line-height: 1.8;
  color: rgba(232, 241, 245, 0.82);
}

/* 准则与合作 */
.page-about .ab-panels {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .ab-panel {
  padding: 20px;
  border: 1px solid var(--line);
  background: linear-gradient(170deg, rgba(18, 63, 94, 0.85), rgba(11, 43, 69, 0.9));
}

.page-about .ab-panel--amber {
  border-color: rgba(245, 165, 36, 0.45);
  background: linear-gradient(170deg, rgba(245, 165, 36, 0.1), rgba(11, 43, 69, 0.92) 62%);
}

.page-about .ab-panel__title {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .ab-panel--amber .ab-panel__title {
  color: var(--amber);
}

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

.page-about .ab-panel__list li {
  padding-top: 12px;
  border-top: 1px solid rgba(44, 90, 117, 0.7);
  font-size: 14px;
  line-height: 1.78;
  color: rgba(232, 241, 245, 0.78);
}

.page-about .ab-panel__list li:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .ab-panel__list strong {
  display: block;
  margin-bottom: 2px;
  color: var(--ice);
  font-weight: 700;
}

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

.page-about .ab-eco li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.page-about .ab-eco__num {
  flex: none;
  font-size: 12px;
  line-height: 1.9;
  color: var(--amber);
}

.page-about .ab-eco h3 {
  margin: 0 0 4px;
  font-size: 15px;
  font-weight: 800;
  color: var(--ice);
}

.page-about .ab-eco p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(232, 241, 245, 0.76);
}

.page-about .ab-panel__foot {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid rgba(44, 90, 117, 0.7);
  font-size: 13px;
  line-height: 1.75;
  color: var(--steel);
}

.page-about .ab-panel__foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(25, 227, 208, 0.5);
}

.page-about .ab-panel__foot a:hover,
.page-about .ab-panel__foot a:focus-visible {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

/* 结尾动作 */
.page-about .ab-cta {
  margin-top: 34px;
  padding: 24px 20px;
  border: 1px solid var(--line);
  border-top: 2px solid var(--amber);
  background:
    repeating-linear-gradient(135deg, rgba(245, 165, 36, 0.06) 0 10px, transparent 10px 20px),
    rgba(11, 43, 69, 0.65);
}

.page-about .ab-cta h2 {
  margin: 0 0 10px;
  font-size: clamp(20px, 4.4vw, 28px);
  line-height: 1.28;
  font-weight: 900;
}

.page-about .ab-cta p {
  margin: 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(232, 241, 245, 0.82);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

/* 中屏 */
@media (min-width: 640px) {
  .page-about .ab-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

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

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

  .page-about .ab-sec__num {
    font-size: 52px;
  }

  .page-about .ab-cta {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    justify-content: space-between;
    gap: 20px;
    padding: 28px 26px;
  }

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

/* 桌面分屏 */
@media (min-width: 960px) {
  .page-about .ab-hero {
    padding: 56px 0 60px;
  }

  .page-about .ab-hero__lead {
    font-size: 17px;
  }

  .page-about .ab-facts {
    margin-top: 36px;
  }

  .page-about .ab-facts__num {
    font-size: 32px;
  }

  .page-about .ab-shell {
    grid-template-columns: minmax(190px, 236px) minmax(0, 1fr);
    gap: 56px;
    padding-top: 44px;
    padding-bottom: 96px;
  }

  .page-about .ab-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }

  .page-about .ab-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .ab-rail__link {
    padding: 10px 0 10px 14px;
    border: 0;
    border-left: 2px solid var(--line);
    background: transparent;
    font-size: 14px;
  }

  .page-about .ab-rail__link:hover,
  .page-about .ab-rail__link:focus-visible {
    border-left-color: var(--cyan);
    background: linear-gradient(90deg, var(--ab-cyan-soft), transparent);
  }

  .page-about .ab-sec {
    padding: 44px 0 12px;
  }

  .page-about .ab-sec__head {
    gap: 22px;
    margin-bottom: 20px;
  }

  .page-about .ab-sec__num {
    font-size: 72px;
  }

  .page-about .ab-sec__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .ab-prose p {
    font-size: 16px;
  }

  .page-about .ab-lead {
    font-size: 16px;
    margin-bottom: 26px;
  }

  .page-about .ab-team {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .ab-team__card:nth-child(even) {
    transform: translateY(20px);
  }

  .page-about .ab-team__card:nth-child(even):hover,
  .page-about .ab-team__card:nth-child(even):focus-within {
    transform: translateY(16px);
  }

  .page-about .ab-method {
    padding: 10px 26px 16px;
  }

  .page-about .ab-step p {
    max-width: 72ch;
  }

  .page-about .ab-panels {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 22px;
    align-items: start;
  }

  .page-about .ab-panel {
    padding: 24px;
  }

  .page-about .ab-cta {
    margin-top: 48px;
    padding: 34px 34px;
  }
}

/* 宽屏收口 */
@media (min-width: 1200px) {
  .page-about .ab-hero__lead {
    font-size: 18px;
  }

  .page-about .ab-prose p {
    font-size: 17px;
  }
}
<<<END>>>