.page-about {
  --ab-grid: rgba(46, 74, 56, 0.16);
  --ab-soft: rgba(46, 74, 56, 0.55);
  --ab-body-w: 660px;
  background: var(--ink);
  color: var(--white);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .ab-hero {
  position: relative;
  padding: 40px 0 44px;
  border-bottom: 1px solid var(--line);
  background-color: var(--ink);
  background-image:
    radial-gradient(120% 90% at 10% 0%, rgba(34, 56, 42, 0.9) 0%, rgba(15, 26, 20, 0) 64%),
    repeating-linear-gradient(0deg, var(--ab-grid) 0 1px, transparent 1px 56px),
    repeating-linear-gradient(90deg, var(--ab-grid) 0 1px, transparent 1px 56px);
}

.page-about .ab-hero .crumbs a {
  color: var(--mist);
  text-decoration: none;
  transition: color var(--t-fast) linear;
}

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

.page-about .ab-hero__eyebrow {
  margin: 26px 0 0;
  font-size: 11px;
  letter-spacing: 0.28em;
  color: var(--signal);
}

.page-about .ab-hero__title {
  margin: 14px 0 18px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(30px, 7.6vw, 62px);
  line-height: 1.12;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .ab-hero__lede {
  margin: 0;
  max-width: var(--ab-body-w);
  font-size: 16px;
  line-height: 1.85;
  color: var(--neutral);
}

.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px;
  background: var(--panel);
}

.page-about .ab-stat__num {
  font-size: 30px;
  line-height: 1;
  font-weight: 700;
  color: var(--data);
}

.page-about .ab-stat__unit {
  font-size: 16px;
  margin-left: 2px;
}

.page-about .ab-stat__label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .ab-sec {
  padding: 52px 0;
  border-bottom: 1px solid var(--ab-soft);
}

.page-about .ab-sec--alt {
  background: var(--panel);
}

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

.page-about .ab-sec__head {
  display: flex;
  flex-direction: column;
  gap: 10px;
  border-left: 2px solid var(--signal);
  padding-left: 14px;
}

.page-about .ab-sec__idx {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--signal);
}

.page-about .ab-sec__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(26px, 6vw, 40px);
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .ab-anno {
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--mist);
  writing-mode: horizontal-tb;
}

.page-about .ab-sec__body > p {
  max-width: var(--ab-body-w);
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--neutral);
}

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

.page-about .ab-lead {
  color: var(--white) !important;
}

.page-about .ab-note {
  margin-top: 18px !important;
  padding-left: 14px;
  border-left: 1px solid var(--line);
  font-size: 14px !important;
  color: var(--mist) !important;
}

.page-about .ab-link {
  color: var(--signal);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 106, 26, 0.45);
  transition: border-color var(--t-fast) linear, color var(--t-fast) linear;
}

.page-about .ab-link:hover,
.page-about .ab-link:focus-visible {
  color: var(--white);
  border-bottom-color: var(--white);
}

/* 图 */
.page-about .ab-fig {
  margin: 22px 0 0;
  max-width: 100%;
}

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

.page-about .ab-fig__cap {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
}

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

/* 时间线 */
.page-about .ab-tl {
  position: relative;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: var(--line);
}

.page-about .ab-tl__item {
  position: relative;
  padding-left: 30px;
  padding-bottom: 22px;
}

.page-about .ab-tl__item::after {
  content: "";
  position: absolute;
  left: 1px;
  top: 12px;
  width: 11px;
  height: 11px;
  background: var(--ink);
  border: 1px solid var(--line);
  transform: rotate(45deg);
  transition: border-color var(--t-base) linear, background-color var(--t-base) linear;
}

.page-about .ab-sec--alt .ab-tl__item::after {
  background: var(--panel);
}

.page-about .ab-tl__item:hover::after {
  border-color: var(--signal);
  background: var(--signal-dark);
}

.page-about .ab-tl__card {
  padding: 14px 16px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  transition: border-color var(--t-base) linear, transform var(--t-base) ease-out;
}

.page-about .ab-sec--alt .ab-tl__card {
  background: var(--ink);
}

.page-about .ab-tl__item:hover .ab-tl__card {
  border-color: var(--signal);
  transform: translateX(4px);
}

.page-about .ab-tl__tag {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--data);
  border: 1px solid var(--line);
  padding: 2px 7px;
}

.page-about .ab-tl__name {
  margin: 10px 0 6px;
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .ab-tl__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

/* 选题 chips */
.page-about .ab-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

/* 流水线面板 */
.page-about .ab-panel {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  padding: 20px 18px;
  background: var(--panel-2);
}

.page-about .ab-panel__bg {
  position: absolute;
  inset: 0;
  margin: 0;
  opacity: 0.26;
  pointer-events: none;
}

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

.page-about .ab-flow {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
}

.page-about .ab-flow__step {
  padding: 16px 14px;
  background: rgba(15, 26, 20, 0.88);
  border-left: 2px solid var(--line);
  transition: border-color var(--t-base) linear;
}

.page-about .ab-flow__step:hover {
  border-left-color: var(--signal);
}

.page-about .ab-flow__num {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--signal);
}

.page-about .ab-flow__name {
  margin: 8px 0 6px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
}

.page-about .ab-flow__step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* 岗位 */
.page-about .ab-roles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin-top: 20px;
}

.page-about .ab-role {
  border: 1px solid var(--line);
  background: var(--panel);
  transition: border-color var(--t-base) linear;
}

.page-about .ab-role:hover,
.page-about .ab-role[open] {
  border-color: var(--signal);
}

.page-about .ab-role summary {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .ab-role__name {
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .ab-role__count {
  font-size: 13px;
  color: var(--data);
}

.page-about .ab-role > p {
  margin: 0;
  padding: 0 16px 16px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

/* 合作 */
.page-about .ab-duo {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 20px 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-duo__item {
  padding: 18px 16px;
  background: var(--panel-2);
}

.page-about .ab-sec--alt .ab-duo__item {
  background: var(--ink);
}

.page-about .ab-duo__num {
  font-size: 34px;
  line-height: 1;
  font-weight: 700;
  color: var(--data);
}

.page-about .ab-duo__label {
  display: block;
  margin: 8px 0 10px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--white);
}

.page-about .ab-duo__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

/* 校对 */
.page-about .ab-checks {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 20px 0 18px;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-check {
  padding: 16px 15px;
  background: var(--panel);
  transition: background-color var(--t-base) linear;
}

.page-about .ab-check:hover {
  background: var(--panel-2);
}

.page-about .ab-check__idx {
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--signal);
}

.page-about .ab-check__name {
  margin: 8px 0 6px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
}

.page-about .ab-check p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

/* 结尾 */
.page-about .ab-cta {
  padding: 48px 0 56px;
  background:
    linear-gradient(180deg, rgba(122, 46, 16, 0.28) 0%, rgba(15, 26, 20, 0) 70%),
    var(--ink);
  border-top: 1px solid var(--line);
}

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

.page-about .ab-cta__title {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(24px, 5.4vw, 36px);
  line-height: 1.15;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .ab-cta__text p {
  margin: 0;
  max-width: 560px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--neutral);
}

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

/* 平板与桌面 */
@media (min-width: 700px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(4, 1fr);
  }

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

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

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

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

@media (min-width: 900px) {
  .page-about .ab-hero {
    padding: 56px 0 60px;
  }

  .page-about .ab-anno {
    writing-mode: vertical-rl;
    letter-spacing: 0.3em;
    font-size: 11px;
    padding-top: 4px;
  }

  .page-about .ab-sec {
    padding: 72px 0;
  }

  .page-about .ab-sec__grid {
    grid-template-columns: 236px minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .ab-sec__head {
    position: sticky;
    top: 104px;
    align-self: start;
    flex-direction: row;
    align-items: flex-start;
    gap: 16px;
    border-left: 0;
    padding-left: 0;
    border-top: 1px solid var(--line);
    padding-top: 18px;
  }

  .page-about .ab-sec__head .ab-sec__title {
    order: 1;
  }

  .page-about .ab-sec__head .ab-sec__idx {
    order: 2;
    margin-left: auto;
  }

  .page-about .ab-sec__head .ab-anno {
    order: 3;
    position: absolute;
    right: -34px;
    top: 18px;
  }

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

  .page-about .ab-tl {
    margin-top: 32px;
  }

  .page-about .ab-tl::before {
    left: 50%;
  }

  .page-about .ab-tl__item {
    width: 50%;
    padding-left: 0;
    padding-bottom: 30px;
  }

  .page-about .ab-tl__item:nth-child(odd) {
    padding-right: 46px;
    text-align: right;
  }

  .page-about .ab-tl__item:nth-child(even) {
    margin-left: 50%;
    padding-left: 46px;
  }

  .page-about .ab-tl__item::after {
    top: 16px;
    left: auto;
  }

  .page-about .ab-tl__item:nth-child(odd)::after {
    right: -6px;
  }

  .page-about .ab-tl__item:nth-child(even)::after {
    left: -6px;
  }

  .page-about .ab-tl__item:nth-child(odd):hover .ab-tl__card {
    transform: translateX(-4px);
  }

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

  .page-about .ab-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 32px;
  }

  .page-about .ab-cta__links {
    justify-content: flex-end;
    max-width: 420px;
  }
}

@media (min-width: 1200px) {
  .page-about .ab-sec__grid {
    grid-template-columns: 268px minmax(0, 1fr);
    gap: 72px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
    animation: none !important;
  }

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