.page-about {
  --ab-gap: clamp(20px, 3vw, 36px);
  --ab-body-text: #CFDAD4;
}

.page-about [id] {
  scroll-margin-top: 24px;
}

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

.page-about .ab-top {
  padding-top: clamp(14px, 2.6vw, 26px);
}

/* 首屏 */
.page-about .ab-hero {
  padding: clamp(22px, 4vw, 48px) 0 clamp(30px, 5.5vw, 68px);
  border-bottom: var(--rule);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .ab-hero__title {
  margin: 14px 0 20px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.4rem, 8vw, 5.8rem);
  line-height: 0.94;
  letter-spacing: -0.03em;
  color: var(--white);
}

.page-about .ab-hero__marks {
  display: inline-block;
  color: var(--orange);
}

.page-about .ab-hero__text {
  max-width: 58ch;
  color: var(--ab-body-text);
}

.page-about .ab-stats {
  margin: 6px 0 0;
  display: grid;
  border-top: 2px solid var(--orange);
}

.page-about .ab-stat {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 13px 0;
  border-bottom: var(--rule);
}

.page-about .ab-stat__label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--grey);
}

.page-about .ab-stat__value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.02em;
}

.page-about .ab-stat__unit {
  margin-left: 5px;
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--grey);
}

@media (min-width: 960px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(280px, 0.45fr);
    align-items: end;
    gap: clamp(32px, 4vw, 64px);
  }
}

/* 通用分屏与标题 */
.page-about .ab-split {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .ab-h2 {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 3.2vw, 2.35rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.012em;
  color: var(--white);
}

.page-about .ab-split__body p {
  margin: 0;
  color: var(--ab-body-text);
}

.page-about .ab-split__body p + p {
  margin-top: 14px;
}

.page-about .ab-split__note {
  margin: 16px 0 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.7;
  color: var(--grey);
}

.page-about .ab-inline {
  color: var(--orange-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .ab-inline:hover {
  color: var(--orange);
}

@media (min-width: 900px) {
  .page-about .ab-split {
    grid-template-columns: minmax(0, 32fr) minmax(0, 68fr);
    gap: clamp(28px, 5vw, 72px);
    align-items: start;
  }

  .page-about .ab-split__aside {
    position: sticky;
    top: clamp(16px, 3vw, 32px);
  }
}

/* 品牌起点配图 */
.page-about .ab-origin__fig {
  margin: clamp(20px, 3vw, 32px) 0 0;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border: var(--rule);
}

.page-about .ab-origin__fig img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 章节头 */
.page-about .ab-sec-head {
  max-width: 68ch;
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .ab-sec-head__text {
  margin: 14px 0 0;
  color: var(--ab-body-text);
}

/* 小组 chips */
.page-about .ab-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 clamp(20px, 3vw, 28px);
  padding: 0;
  list-style: none;
}

.page-about .ab-chips .chip {
  text-decoration: none;
}

/* 2×2 控制台面板 */
.page-about .ab-panels {
  display: grid;
  gap: 14px;
}

.page-about .ab-panel {
  position: relative;
  padding: 20px 20px 22px;
  background: var(--ink-800);
  border: var(--rule);
  border-left: 2px solid var(--line);
  overflow: hidden;
  transition: border-left-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .ab-panel:hover,
.page-about .ab-panel:focus-within {
  border-left-color: var(--orange);
  background: var(--ink-700);
}

.page-about .ab-panel__top {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: var(--rule);
}

.page-about .ab-panel__num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .ab-panel__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--white);
}

.page-about .ab-panel__text {
  margin: 14px 0 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--ab-body-text);
}

.page-about .ab-panel__list {
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .ab-panel__list li {
  position: relative;
  padding-left: 16px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.7;
  color: var(--grey);
}

.page-about .ab-panel__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 6px;
  height: 6px;
  background: var(--orange);
}

@media (min-width: 760px) {
  .page-about .ab-panels {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

/* 归档流程 */
.page-about .ab-flow-grid {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .ab-flow__fig {
  margin: 0;
  aspect-ratio: 3 / 4;
  overflow: hidden;
  border: var(--rule);
  background: var(--ink-800);
}

.page-about .ab-flow__fig img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

.page-about .ab-flow__step {
  padding: 18px 18px 20px;
  background: var(--ink-800);
  border: var(--rule);
  border-top: 2px solid var(--line);
  transition: border-top-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .ab-flow__step:hover {
  border-top-color: var(--orange);
  background: var(--ink-700);
}

.page-about .ab-flow__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--orange);
  padding-bottom: 10px;
}

.page-about .ab-flow__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--white);
}

.page-about .ab-flow__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--ab-body-text);
}

@media (min-width: 760px) {
  .page-about .ab-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-flow-grid {
    grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
    align-items: start;
  }
}

/* 时间轴 */
.page-about .ab-time {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-time__item {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
}

.page-about .ab-time__year {
  padding-right: 14px;
  border-right: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-align: right;
  color: var(--grey);
  transition: color var(--dur) var(--ease);
}

.page-about .ab-time__body {
  position: relative;
  padding: 0 0 30px 24px;
}

.page-about .ab-time__body::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 5px;
  width: 7px;
  height: 7px;
  background: var(--ink-900);
  border: 1px solid var(--line);
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .ab-time__item:hover .ab-time__year {
  color: var(--orange);
}

.page-about .ab-time__item:hover .ab-time__body::before {
  background: var(--orange);
  border-color: var(--orange);
}

.page-about .ab-time__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--white);
}

.page-about .ab-time__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--ab-body-text);
}

/* 服务范围 */
.page-about .ab-reach__panel {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4vw, 56px);
  background: var(--ink-800);
  border: var(--rule);
}

.page-about .ab-reach__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.24;
  filter: saturate(0.65);
}

.page-about .ab-reach__panel::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(100deg, rgba(6, 18, 14, 0.95) 10%, rgba(6, 18, 14, 0.62) 58%, rgba(6, 18, 14, 0.2) 100%);
}

.page-about .ab-reach__inner {
  position: relative;
  z-index: 2;
  max-width: 72ch;
}

.page-about .ab-reach__text {
  margin: 14px 0 0;
  color: var(--ab-body-text);
}

.page-about .ab-reach__facts {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: var(--rule);
}

.page-about .ab-reach__fact {
  padding: 15px 18px;
  background: rgba(6, 18, 14, 0.92);
}

.page-about .ab-reach__fact b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 2.6vw, 1.9rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--orange);
}

.page-about .ab-reach__unit {
  font-size: 0.7em;
}

.page-about .ab-reach__fact span {
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--grey);
}

@media (min-width: 640px) {
  .page-about .ab-reach__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* 联络 */
.page-about .ab-contact__grid {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .ab-contact__lead p {
  margin: 14px 0 0;
  color: var(--ab-body-text);
}

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

.page-about .ab-contact__actions .btn {
  text-decoration: none;
}

.page-about .ab-contact__card {
  padding: 4px 20px 16px;
  background: var(--ink-800);
  border: var(--rule);
  border-top: 2px solid var(--orange);
}

.page-about .ab-contact__row {
  display: grid;
  gap: 7px;
  padding: 15px 0;
  border-bottom: var(--rule);
}

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

.page-about .ab-contact__label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--grey);
}

.page-about .ab-contact__value {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--white);
  word-break: break-word;
}

.page-about .ab-copy {
  display: block;
  width: 100%;
  padding: 9px 11px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--white);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 2px;
  cursor: pointer;
  word-break: break-all;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .ab-copy:hover {
  border-color: var(--orange);
  color: var(--orange-soft);
}

.page-about .ab-copy:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

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

@media (min-width: 900px) {
  .page-about .ab-contact__grid {
    grid-template-columns: minmax(0, 1fr) minmax(300px, 420px);
    gap: clamp(28px, 5vw, 64px);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-panel,
  .page-about .ab-flow__step,
  .page-about .ab-time__year,
  .page-about .ab-time__body::before,
  .page-about .ab-copy {
    transition: none;
  }
}
<<<END>>>