.page-about {
  --ab-rail: 96px;
  --ab-edge: rgba(184, 131, 62, 0.34);
  --ab-rule: rgba(14, 42, 47, 0.12);
  background: var(--paper);
  color: var(--ink);
}

.page-about .ab-wrap {
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.page-about .ab-crumb {
  padding-block: clamp(18px, 3vw, 32px) 0;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding-block: clamp(24px, 4vw, 44px) clamp(36px, 6vw, 80px);
  border-bottom: 1px solid var(--hairline);
  background-image:
    linear-gradient(rgba(184, 131, 62, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(184, 131, 62, 0.07) 1px, transparent 1px);
  background-size: 96px 96px;
  background-position: center top;
}

.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 50px);
  align-items: start;
}

.page-about .ab-hero__eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--copper);
}

.page-about .ab-hero h1 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(32px, 6vw, 64px);
  line-height: 1.14;
  letter-spacing: 0.01em;
  color: var(--ink-teal);
  margin: 0 0 0.55em;
}

.page-about .ab-hero__lede {
  margin: 0;
  max-width: 36em;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.9;
  color: rgba(17, 24, 23, 0.82);
}

.page-about .ab-facts {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--ab-rule);
  border: 1px solid var(--ab-rule);
}

.page-about .ab-facts li {
  background: var(--paper);
  padding: 13px 16px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .ab-facts__key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--celadon);
}

.page-about .ab-facts__val {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink-teal);
}

.page-about .ab-media {
  position: relative;
  margin: 0;
  border: 1px solid var(--ab-edge);
  background:
    repeating-linear-gradient(135deg, rgba(14, 42, 47, 0.05) 0 1px, transparent 1px 9px),
    var(--slate);
}

.page-about .ab-media::after {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(184, 131, 62, 0.3);
  pointer-events: none;
}

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

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

/* ---------- 章节骨架 ---------- */
.page-about .ab-chapter {
  padding-block: clamp(38px, 6vw, 76px);
  border-top: 1px solid var(--hairline);
}

.page-about .ab-chapter__inner {
  display: grid;
  gap: clamp(16px, 3vw, 30px);
}

.page-about .ab-chapter__index {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .ab-chapter__letter {
  font-family: var(--font-serif);
  font-size: clamp(26px, 3vw, 38px);
  line-height: 1;
  color: var(--copper);
}

.page-about .ab-chapter__kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--celadon);
}

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

.page-about .ab-chapter__body h2 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(23px, 3.4vw, 38px);
  line-height: 1.32;
  color: var(--ink-teal);
  margin: 0 0 0.7em;
}

.page-about .ab-chapter__body > p {
  margin: 0 0 1em;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(17, 24, 23, 0.84);
}

.page-about .ab-chapter__more {
  margin-top: clamp(20px, 3vw, 30px);
  font-size: 15px;
  line-height: 1.9;
  color: rgba(17, 24, 23, 0.72);
}

.page-about .ab-link {
  color: var(--copper);
  text-decoration: none;
  border-bottom: 1px solid var(--ab-edge);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

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

/* ---------- 服务场景 ---------- */
.page-about .ab-scenes {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--ab-rule);
  border: 1px solid var(--ab-rule);
}

.page-about .ab-scene {
  background: var(--paper);
  padding: clamp(18px, 2.4vw, 26px);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .ab-scene__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--copper);
}

.page-about .ab-scene__title {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--ink-teal);
}

.page-about .ab-scene__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(17, 24, 23, 0.76);
}

/* ---------- 时间线 ---------- */
.page-about .ab-timeline {
  margin-top: clamp(22px, 3vw, 36px);
  display: grid;
  gap: clamp(18px, 3vw, 30px);
}

.page-about .ab-timeline__rail {
  display: flex;
  gap: 16px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
}

.page-about .ab-timeline__rail a {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--celadon);
  text-decoration: none;
  white-space: nowrap;
  padding-bottom: 4px;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

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

.page-about .ab-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .ab-timeline__list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, rgba(184, 131, 62, 0.6), rgba(184, 131, 62, 0.12));
}

.page-about .ab-timeline__item {
  position: relative;
  padding: 0 0 clamp(22px, 3vw, 34px) clamp(26px, 3vw, 36px);
}

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

.page-about .ab-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 11px;
  height: 11px;
  border: 1px solid var(--copper);
  background: var(--paper);
  transform: rotate(45deg);
}

.page-about .ab-timeline__year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--copper);
}

.page-about .ab-timeline__text {
  margin: 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(17, 24, 23, 0.82);
}

.page-about .ab-timeline__figure {
  margin-top: clamp(26px, 4vw, 44px);
}

/* ---------- 团队 ---------- */
.page-about .ab-teams {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.6vw, 24px);
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .ab-team {
  border: 1px solid var(--hairline);
  border-top: 2px solid var(--copper);
  background: rgba(255, 255, 255, 0.6);
  padding: clamp(18px, 2.2vw, 24px);
}

.page-about .ab-team__no {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--celadon);
}

.page-about .ab-team__name {
  margin: 0 0 0.5em;
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 600;
  color: var(--ink-teal);
}

.page-about .ab-team__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(17, 24, 23, 0.76);
}

.page-about .ab-teams__figure {
  margin-top: clamp(24px, 3.4vw, 40px);
}

/* ---------- 承诺与联系 ---------- */
.page-about .ab-pledge {
  position: relative;
  overflow: hidden;
  margin-top: clamp(20px, 3vw, 32px);
  padding: clamp(22px, 3.4vw, 40px);
  background: var(--ink-teal);
  border: 1px solid rgba(184, 131, 62, 0.45);
  color: var(--paper);
}

.page-about .ab-pledge::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--copper), transparent 72%);
}

.page-about .ab-pledge__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .ab-pledge__title {
  margin: 0 0 0.7em;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(19px, 2.6vw, 27px);
  line-height: 1.45;
  color: var(--white);
}

.page-about .ab-pledge__text {
  margin: 0 0 1.5em;
  max-width: 38em;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(242, 245, 242, 0.84);
}

.page-about .ab-pledge__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  font-family: var(--font-sans);
  font-size: 15px;
  text-decoration: none;
  border: 1px solid var(--copper);
  background: transparent;
  color: var(--amber);
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .ab-btn:hover,
.page-about .ab-btn:focus-visible {
  background: var(--copper);
  border-color: var(--copper);
  color: var(--ink-deep);
}

.page-about .ab-btn--solid {
  background: var(--copper);
  color: var(--ink-deep);
}

.page-about .ab-btn--solid:hover,
.page-about .ab-btn--solid:focus-visible {
  background: var(--copper-bright);
  border-color: var(--copper-bright);
}

/* ---------- 响应式 ---------- */
@media (min-width: 600px) {
  .page-about .ab-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .ab-scenes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .ab-timeline {
    grid-template-columns: 72px minmax(0, 1fr);
    gap: clamp(20px, 3vw, 40px);
  }

  .page-about .ab-timeline__rail {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
    position: sticky;
    top: 104px;
    align-self: start;
    gap: 14px;
  }

  .page-about .ab-timeline__rail a {
    padding-bottom: 0;
    padding-left: 9px;
    border-bottom: 0;
    border-left: 1px solid transparent;
  }

  .page-about .ab-timeline__rail a:hover,
  .page-about .ab-timeline__rail a:focus-visible {
    border-left-color: var(--copper);
    border-bottom-color: transparent;
  }
}

@media (min-width: 820px) {
  .page-about .ab-teams {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .ab-team:nth-child(2) {
    margin-top: 32px;
  }

  .page-about .ab-team:nth-child(3) {
    margin-top: 64px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .ab-chapter__inner {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
  }

  .page-about .ab-chapter__index {
    flex-direction: column;
    gap: 10px;
    align-self: start;
    position: sticky;
    top: 104px;
  }

  .page-about .ab-chapter__letter::after {
    content: "";
    display: block;
    width: 1px;
    height: clamp(40px, 8vh, 88px);
    margin: 14px 0 0 2px;
    background: linear-gradient(180deg, var(--copper), rgba(184, 131, 62, 0));
  }
}

@media (min-width: 1080px) {
  .page-about .ab-scenes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-link,
  .page-about .ab-btn,
  .page-about .ab-timeline__rail a {
    transition: none;
  }
}
<<<END>>>