.page-about {
  --ab-rail-w: 190px;
  background: var(--rice-50);
}

.page-about .ab-crumb {
  padding: var(--sp-3) 0 var(--sp-2);
}

/* ---------- 首屏框景 ---------- */

.page-about .ab-hero {
  padding-bottom: var(--sp-5);
}

.page-about .ab-hero__frame {
  position: relative;
  padding: var(--sp-5) var(--sp-3) var(--sp-4);
  background: var(--rice-50);
}

.page-about .ab-hero__inner {
  display: grid;
  gap: var(--sp-3);
}

.page-about .ab-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(34px, 8.4vw, 82px);
  line-height: 1.04;
  letter-spacing: -0.012em;
  color: var(--sabah-900);
  max-width: 18ch;
}

.page-about .ab-hero__intro {
  margin: 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--charcoal-950);
}

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--sp-3) var(--sp-2);
  margin: var(--sp-2) 0 0;
  padding: var(--sp-3) 0 0;
  border-top: 2px solid var(--sabah-500);
  list-style: none;
}

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

.page-about .ab-stat__num {
  display: block;
  font-size: 26px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--sabah-700);
}

.page-about .ab-stat__k {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--rock-600);
}

@media (min-width: 700px) {
  .page-about .ab-hero__frame {
    padding: var(--sp-5) var(--sp-4) var(--sp-4);
  }
  .page-about .ab-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .ab-stat__num {
    font-size: 32px;
  }
}

/* ---------- 主体骨架 ---------- */

.page-about .ab-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-5);
  padding-bottom: var(--sp-7);
}

.page-about .ab-rail {
  display: none;
}

.page-about .ab-body {
  display: grid;
  gap: var(--sp-6);
  min-width: 0;
}

@media (min-width: 1024px) {
  .page-about .ab-layout {
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    gap: var(--sp-6);
  }
  .page-about .ab-rail {
    display: block;
  }
  .page-about .ab-rail__inner {
    position: sticky;
    top: 104px;
  }
}

.page-about .ab-rail__title {
  margin: 0 0 var(--sp-2);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--rock-600);
}

.page-about .ab-rail__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
}

.page-about .ab-rail__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 0 7px 12px;
  border-left: 2px solid var(--paper-edge);
  font-size: 13px;
  line-height: 1.4;
  color: var(--rock-600);
  text-decoration: none;
  transition: color 180ms ease, border-color 180ms ease;
}

.page-about .ab-rail__list a .mono {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--sabah-500);
}

.page-about .ab-rail__list a:hover,
.page-about .ab-rail__list a:focus-visible {
  color: var(--sabah-700);
  border-left-color: var(--neon-400);
}

.page-about .ab-rail__list a:focus-visible {
  outline: 2px solid var(--neon-400);
  outline-offset: 2px;
}

/* ---------- 章节通用 ---------- */

.page-about .ab-section {
  min-width: 0;
  scroll-margin-top: 120px;
}

.page-about .ab-section h2 {
  margin: 0 0 var(--sp-2);
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(25px, 4.6vw, 42px);
  line-height: 1.12;
  color: var(--sabah-900);
}

.page-about .ab-section__lead {
  margin: 0 0 var(--sp-3);
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--rock-600);
}

.page-about .ab-section--narrow .section-head {
  max-width: 54ch;
}

.page-about .ab-cols {
  display: grid;
  gap: var(--sp-4);
  margin-top: var(--sp-3);
}

@media (min-width: 880px) {
  .page-about .ab-cols {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
  .page-about .ab-cols--rev {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }
}

/* ---------- 起点旁注 ---------- */

.page-about .ab-note {
  padding: var(--sp-3);
  border-radius: 3px;
  box-shadow: var(--shadow-card);
}

.page-about .ab-note__k {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  color: var(--sabah-700);
}

.page-about .ab-note p {
  margin: 0 0 var(--sp-2);
  font-size: 14px;
  line-height: 1.75;
  color: var(--charcoal-950);
}

.page-about .ab-note .btn {
  margin-top: 4px;
}

/* ---------- 评测流程 ---------- */

.page-about .ab-flow {
  margin-top: var(--sp-4);
  padding: var(--sp-4) var(--sp-3);
  border-radius: 4px;
  box-shadow: var(--shadow-card);
}

.page-about .ab-flow__list {
  margin: 0 0 var(--sp-4);
  padding: 0;
  list-style: none;
  display: grid;
  gap: var(--sp-2);
  counter-reset: none;
}

.page-about .ab-flow__list li {
  display: grid;
  gap: 6px;
  padding: var(--sp-3);
  border: 1px solid rgba(79, 224, 200, 0.28);
  border-radius: 3px;
  transition: border-color 180ms ease, transform 180ms ease;
}

.page-about .ab-flow__list li:hover {
  border-color: var(--neon-400);
  transform: translateY(-2px);
}

.page-about .ab-flow__no {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--clay-500);
}

.page-about .ab-flow__list h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 20px;
  line-height: 1.2;
  color: var(--rice-50);
}

.page-about .ab-flow__list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(248, 245, 237, 0.78);
}

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

@media (min-width: 820px) {
  .page-about .ab-flow {
    padding: var(--sp-4);
  }
  .page-about .ab-flow__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--sp-3);
  }
}

/* ---------- 数据来源 ---------- */

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

.page-about .ab-facts li {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  align-items: baseline;
  gap: var(--sp-2);
  padding: var(--sp-2) 0;
  border-bottom: 1px solid var(--paper-edge);
}

.page-about .ab-facts li:first-child {
  border-top: 1px solid var(--paper-edge);
}

.page-about .ab-facts__n {
  font-size: 21px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--sabah-700);
}

.page-about .ab-facts li > span:last-child {
  font-size: 14px;
  line-height: 1.7;
  color: var(--charcoal-950);
}

/* ---------- 团队 ---------- */

.page-about .ab-team__fig {
  margin: var(--sp-4) 0 var(--sp-4);
}

.page-about .ab-team__grid {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: var(--sp-2);
}

.page-about .ab-team__grid > li {
  min-width: 0;
}

.page-about .ab-role {
  border-radius: 3px;
  padding: var(--sp-3);
  transition: transform 180ms ease, border-color 180ms ease;
}

.page-about .ab-role:hover {
  transform: translateY(-2px);
}

.page-about .ab-role summary {
  display: flex;
  align-items: baseline;
  gap: 10px;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
  color: var(--sabah-900);
}

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

.page-about .ab-role summary::after {
  content: "＋";
  margin-left: auto;
  font-size: 15px;
  color: var(--clay-500);
  transition: color 180ms ease;
}

.page-about .ab-role[open] summary::after {
  content: "－";
  color: var(--sabah-500);
}

.page-about .ab-role summary:focus-visible {
  outline: 2px solid var(--neon-400);
  outline-offset: 3px;
}

.page-about .ab-role__no {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--sabah-500);
}

.page-about .ab-role p {
  margin: var(--sp-2) 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--charcoal-950);
}

@media (min-width: 700px) {
  .page-about .ab-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--sp-3);
  }
}

/* ---------- 发展历程 ---------- */

.page-about .ab-timeline {
  position: relative;
  margin: var(--sp-4) 0 0;
  padding: 0 0 0 var(--sp-4);
  list-style: none;
  display: grid;
  gap: var(--sp-3);
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: var(--paper-edge);
}

.page-about .ab-timeline__item {
  position: relative;
  scroll-margin-top: 120px;
}

.page-about .ab-timeline__item::before {
  content: "";
  position: absolute;
  left: calc(var(--sp-4) * -1);
  top: 6px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--rice-50);
  border: 2px solid var(--sabah-500);
}

.page-about .ab-timeline__item--now::before {
  border-color: var(--clay-500);
  background: var(--clay-500);
}

.page-about .ab-timeline__d {
  padding-bottom: var(--sp-1);
}

.page-about .ab-timeline__d summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  list-style: none;
  cursor: pointer;
}

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

.page-about .ab-timeline__d summary:focus-visible {
  outline: 2px solid var(--neon-400);
  outline-offset: 3px;
}

.page-about .ab-timeline__year {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--clay-500);
}

.page-about .ab-timeline__title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.35;
  color: var(--sabah-900);
}

.page-about .ab-timeline__d summary:hover .ab-timeline__title {
  color: var(--sabah-500);
}

.page-about .ab-timeline__d p {
  margin: var(--sp-2) 0 0;
  max-width: 58ch;
  font-size: 14px;
  line-height: 1.78;
  color: var(--charcoal-950);
}

/* ---------- 行业认可 ---------- */

.page-about .ab-award__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: var(--sp-2);
}

.page-about .ab-award__item {
  padding: var(--sp-2) 0 var(--sp-3);
  border-bottom: 1px solid var(--paper-edge);
}

.page-about .ab-award__item p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--charcoal-950);
}

.page-about .ab-award__item .tag {
  transition: background-color 180ms ease, color 180ms ease, border-color 180ms ease;
}

.page-about .ab-award__item:hover .tag--clay {
  background: var(--clay-500);
  color: var(--rice-50);
  border-color: var(--clay-500);
}

.page-about .ab-award__item:hover .tag--neon {
  background: var(--neon-400);
  color: var(--charcoal-950);
}

/* ---------- 服务基地 ---------- */

.page-about .ab-base {
  display: grid;
  gap: var(--sp-3);
  margin-top: var(--sp-4);
}

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

.page-about .ab-base__info {
  padding: var(--sp-4) var(--sp-3);
  border-radius: 4px;
  box-shadow: var(--shadow-card);
}

.page-about .ab-base__lead {
  margin: 0 0 var(--sp-3);
  font-size: 15px;
  line-height: 1.8;
  color: rgba(248, 245, 237, 0.88);
}

.page-about .ab-base__dl {
  margin: 0;
  display: grid;
  gap: var(--sp-2);
}

.page-about .ab-base__dl > div {
  display: grid;
  gap: 4px;
  padding-top: var(--sp-2);
  border-top: 1px solid rgba(227, 221, 203, 0.18);
}

.page-about .ab-base__dl dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--neon-400);
}

.page-about .ab-base__dl dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(248, 245, 237, 0.92);
}

.page-about .ab-base__note {
  margin: var(--sp-3) 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(248, 245, 237, 0.6);
}

.page-about .ab-base__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  margin-top: var(--sp-3);
}

@media (min-width: 900px) {
  .page-about .ab-base {
    grid-template-columns: minmax(0, 1fr);
  }
  .page-about .ab-base__info {
    padding: var(--sp-4);
  }
  .page-about .ab-base__dl {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--sp-3);
  }
}
<<<END>>>