.page-about {
  --about-muted: rgba(28, 31, 36, .62);
  --about-body: rgba(28, 31, 36, .78);
  --about-line: rgba(28, 31, 36, .14);
  --about-line-strong: rgba(28, 31, 36, .26);
  background-color: var(--bb-paper);
  color: var(--bb-ink);
  overflow-x: hidden;
}

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

.page-about .breadcrumb {
  padding-top: clamp(14px, 2vw, 22px);
}

/* ---------- 首屏拼贴 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(16px, 2.6vw, 28px) 0 clamp(34px, 5vw, 64px);
  border-bottom: 1px solid var(--bb-line);
  background-image:
    linear-gradient(rgba(27, 79, 156, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(27, 79, 156, .07) 1px, transparent 1px);
  background-size: 46px 46px;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-hero__lead {
  padding-bottom: 6px;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(29px, 5.4vw, 54px);
  line-height: 1.24;
  letter-spacing: .01em;
}

.page-about .about-hero__mark {
  color: var(--bb-blue);
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 46ch;
  font-size: clamp(15px, 1.05vw, 17px);
  line-height: 1.92;
  color: var(--about-body);
}

.page-about .about-hero__num {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 18px;
  min-height: 168px;
  padding: 20px 22px 22px;
  border-radius: var(--r-lg);
}

.page-about .about-hero__num--year {
  background: var(--bb-indigo);
}

.page-about .about-hero__num--field {
  background: var(--bb-blue);
}

.page-about .about-num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(44px, 8.2vw, 82px);
  line-height: .88;
  letter-spacing: .06em;
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__num--year .about-num {
  color: var(--bb-orange);
}

.page-about .about-hero__num--field .about-num {
  color: var(--bb-paper);
}

.page-about .about-num__label {
  font-size: 13px;
  line-height: 1.72;
  color: rgba(255, 255, 255, .74);
}

.page-about .about-hero__note {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  border: 1px dashed rgba(192, 57, 43, .42);
  border-radius: var(--r-md);
  background: rgba(192, 57, 43, .05);
  color: var(--bb-red);
}

.page-about .about-hero__note-lead {
  width: 48px;
  height: 20px;
  flex: 0 0 auto;
}

.page-about .about-hero__note .annotation {
  margin: 0;
  font-size: 17px;
  line-height: 1.4;
}

.page-about .about-hero__index {
  padding: 18px 20px 20px;
  border: 1px solid var(--about-line-strong);
  border-radius: var(--r-lg);
  background: rgba(255, 255, 255, .58);
}

.page-about .about-hero__index-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--about-muted);
}

.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-jump a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px 7px 12px;
  border: 1px solid var(--about-line-strong);
  border-radius: 999px;
  background: var(--bb-paper);
  color: var(--bb-indigo);
  font-size: 13px;
  font-family: var(--font-serif);
  text-decoration: none;
  transition: background-color .16s ease, color .16s ease, border-color .16s ease, transform .16s ease;
}

.page-about .about-jump a span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--bb-orange);
}

.page-about .about-jump a:hover,
.page-about .about-jump a:focus-visible {
  background: var(--bb-blue);
  border-color: var(--bb-blue);
  color: #fff;
  transform: translateY(-1px);
}

.page-about .about-jump a:hover span,
.page-about .about-jump a:focus-visible span {
  color: var(--bb-yellow);
}

/* ---------- 通用章节 ---------- */
.page-about .section {
  padding: clamp(42px, 6.4vw, 84px) 0;
}

.page-about .section + .section {
  border-top: 1px solid var(--bb-line);
}

.page-about .about-sec__head {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .about-h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(25px, 3.4vw, 42px);
  line-height: 1.28;
  letter-spacing: .01em;
}

.page-about .about-lede {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.92;
  color: var(--about-body);
}

.page-about .about-note {
  margin: 22px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--bb-orange);
  font-size: 13px;
  line-height: 1.85;
  color: var(--about-muted);
  max-width: 62ch;
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  --tl-axis: 18px;
  position: relative;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: var(--tl-axis);
  top: 12px;
  bottom: 12px;
  border-left: 2px dashed rgba(27, 79, 156, .32);
}

.page-about .timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 20px 0 20px 42px;
  border-top: 1px dashed var(--about-line-strong);
  scroll-margin-top: 90px;
}

.page-about .timeline__item:first-child {
  border-top: 0;
  padding-top: 4px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: calc(var(--tl-axis) - 5px);
  top: 28px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--bb-orange);
  box-shadow: 0 0 0 4px var(--bb-paper);
}

.page-about .timeline__item:first-child::before {
  top: 12px;
}

.page-about .timeline__year {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 5vw, 38px);
  line-height: 1;
  letter-spacing: .06em;
  color: var(--bb-blue);
  font-variant-numeric: tabular-nums;
}

.page-about .timeline__tag {
  display: inline-block;
  margin-bottom: 9px;
  padding: 3px 11px;
  border-radius: 999px;
  background: rgba(27, 79, 156, .1);
  color: var(--bb-blue);
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: .14em;
}

.page-about .timeline__body h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 600;
  line-height: 1.5;
}

.page-about .timeline__body p {
  margin: 8px 0 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--about-body);
}

.page-about .timeline__item--figure {
  border-top: 0;
}

.page-about .timeline__item--figure::before {
  display: none;
}

.page-about .timeline__media .figure {
  margin: 0;
}

/* ---------- 校订方法 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

.page-about .about-split__media .figure {
  margin: 0;
}

.page-about .about-margin-note {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 14px;
  color: var(--bb-red);
}

.page-about .about-margin-note__lead {
  width: 56px;
  height: 22px;
  flex: 0 0 auto;
}

.page-about .about-margin-note .annotation {
  margin: 0;
  font-size: 17px;
  line-height: 1.4;
}

.page-about .rules {
  display: grid;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .rules__item {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 0 14px;
  padding: 18px 0;
  border-top: 1px solid var(--about-line-strong);
}

.page-about .rules__item:last-child {
  border-bottom: 1px solid var(--about-line-strong);
}

.page-about .rules__num {
  grid-row: span 2;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--bb-orange);
}

.page-about .rules__item h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.5;
}

.page-about .rules__item p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--about-body);
}

/* ---------- 窄条 ---------- */
.page-about .about-strip {
  background: var(--bb-indigo);
}

.page-about .about-strip__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 26px;
  padding-top: clamp(24px, 3vw, 36px);
  padding-bottom: clamp(24px, 3vw, 36px);
}

.page-about .about-strip__label {
  margin: 0;
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--bb-orange);
}

.page-about .about-strip__value {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(20px, 2.6vw, 30px);
  line-height: 1.5;
  color: rgba(255, 255, 255, .92);
}

/* ---------- 团队 ---------- */
.page-about .about-statline {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin: 30px 0 0;
}

.page-about .about-statline .stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 14px;
  border-top: 2px solid var(--bb-blue);
}

.page-about .about-statline .stat__num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(40px, 6.6vw, 68px);
  line-height: .95;
  letter-spacing: .04em;
  color: var(--bb-blue);
  font-variant-numeric: tabular-nums;
}

.page-about .about-statline .stat__label {
  font-size: 13px;
  line-height: 1.7;
  color: var(--about-muted);
}

.page-about .roles {
  margin-top: 34px;
}

.page-about .roles__bar {
  display: flex;
  height: 26px;
  border-radius: 999px;
  overflow: hidden;
  background: var(--bb-gray);
}

.page-about .roles__seg {
  display: block;
  transition: filter .18s ease;
}

.page-about .roles__seg--quality {
  flex: 78;
  background: var(--bb-blue);
}

.page-about .roles__seg--service {
  flex: 143;
  background: rgba(27, 79, 156, .62);
}

.page-about .roles__seg--support {
  flex: 391;
  background: rgba(27, 79, 156, .24);
}

.page-about .roles__seg:hover {
  filter: brightness(1.1) saturate(1.08);
}

.page-about .roles__list {
  display: grid;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .role {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 18px 0;
  border-top: 1px solid var(--about-line-strong);
}

.page-about .role:last-child {
  border-bottom: 1px solid var(--about-line-strong);
}

.page-about .role__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
}

.page-about .role__num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 30px;
  line-height: 1;
  letter-spacing: .04em;
  color: var(--bb-orange);
  font-variant-numeric: tabular-nums;
}

.page-about .role h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
}

.page-about .role__share {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--about-muted);
}

.page-about .role p {
  margin: 4px 0 0;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--about-body);
}

/* ---------- 资质 ---------- */
.page-about .about-certs {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

.page-about .certs {
  margin: 26px 0 0;
  padding: 0;
}

.page-about .certs__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 16px 0;
  border-top: 1px solid var(--bb-gray);
}

.page-about .certs__row:last-child {
  border-bottom: 1px solid var(--bb-gray);
}

.page-about .certs dt {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 16px;
  line-height: 1.6;
}

.page-about .certs dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-body);
}

.page-about .about-certs__media .figure {
  margin: 0;
}

/* ---------- 更新节奏 ---------- */
.page-about .cadence {
  display: grid;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .cadence__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 20px 0;
  border-top: 1px solid var(--about-line-strong);
}

.page-about .cadence__row:last-child {
  border-bottom: 1px solid var(--about-line-strong);
}

.page-about .cadence__cycle {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: .12em;
  color: var(--bb-orange);
}

.page-about .cadence__body h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.5;
}

.page-about .cadence__body p {
  margin: 8px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--about-body);
}

.page-about .cadence__owner {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--about-muted);
}

/* ---------- 合作与渠道 ---------- */
.page-about .partners {
  display: grid;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .partners li {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 4px 18px;
  padding: 20px 0;
  border-top: 1px dashed var(--about-line-strong);
}

.page-about .partners li:last-child {
  border-bottom: 1px dashed var(--about-line-strong);
}

.page-about .partners__idx {
  grid-row: span 2;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--bb-red);
}

.page-about .partners h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.5;
}

.page-about .partners p {
  margin: 6px 0 0;
  max-width: 70ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--about-body);
}

/* ---------- 出口区 ---------- */
.page-about .about-exit {
  padding: clamp(38px, 5.4vw, 72px) 0;
  background: var(--bb-indigo);
}

.page-about .about-exit__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

.page-about .about-exit h2 {
  margin: 0 0 12px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(23px, 3vw, 36px);
  line-height: 1.35;
  color: #fff;
}

.page-about .about-exit p {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.92;
  color: rgba(255, 255, 255, .76);
}

.page-about .about-exit__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-exit .btn--ghost {
  color: #fff;
  border-color: rgba(255, 255, 255, .42);
}

.page-about .about-exit .btn--ghost:hover,
.page-about .about-exit .btn--ghost:focus-visible {
  background: rgba(255, 255, 255, .12);
  border-color: rgba(255, 255, 255, .7);
  color: #fff;
}

@media (min-width: 700px) {
  .page-about .certs__row {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 0 24px;
    align-items: baseline;
  }

  .page-about .about-statline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 32px;
    align-items: end;
  }

  .page-about .role {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 0 28px;
  }

  .page-about .role p {
    margin-top: 0;
    padding-top: 6px;
  }
}

@media (min-width: 768px) {
  .page-about .about-hero__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-hero__lead {
    grid-column: 1 / span 6;
  }

  .page-about .about-hero__num--year {
    grid-column: 7 / span 3;
  }

  .page-about .about-hero__num--field {
    grid-column: 10 / span 3;
  }

  .page-about .about-hero__note {
    grid-column: 1 / span 4;
  }

  .page-about .about-hero__index {
    grid-column: 5 / span 8;
  }
}

@media (min-width: 880px) {
  .page-about .timeline {
    --tl-axis: 132px;
  }

  .page-about .timeline__item {
    grid-template-columns: 112px minmax(0, 1fr);
    gap: 0;
    padding: 26px 0;
  }

  .page-about .timeline__item:first-child {
    padding-top: 8px;
  }

  .page-about .timeline__year {
    text-align: right;
    padding-right: 24px;
    font-size: 32px;
  }

  .page-about .timeline__body {
    padding-left: 40px;
  }

  .page-about .timeline__item::before {
    top: 34px;
  }

  .page-about .timeline__item:first-child::before {
    top: 18px;
  }

  .page-about .timeline__item--figure {
    grid-template-columns: minmax(0, 1fr);
    padding-left: 152px;
  }
}

@media (min-width: 940px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-certs {
    grid-template-columns: minmax(0, 6fr) minmax(0, 4fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-exit__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 44px;
  }

  .page-about .cadence__row {
    grid-template-columns: 96px minmax(0, 1fr) 190px;
    gap: 0 28px;
    align-items: baseline;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-jump a,
  .page-about .roles__seg {
    transition: none;
  }
}
<<<END>>>