.page-about {
  --about-pad: clamp(44px, 7.5vw, 92px);
  --about-gap: clamp(24px, 4vw, 48px);
  --about-line: rgba(169, 180, 204, 0.2);
  background: var(--indigo);
  color: var(--text-1);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(36px, 6vw, 80px) 0 clamp(36px, 6vw, 64px);
  background:
    radial-gradient(120% 90% at 82% 6%, rgba(57, 230, 208, 0.16), transparent 58%),
    radial-gradient(90% 70% at 6% 80%, rgba(232, 180, 74, 0.14), transparent 55%),
    linear-gradient(180deg, var(--midnight) 0%, var(--indigo) 84%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--about-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--about-line) 1px, transparent 1px);
  background-size: 88px 88px;
  opacity: 0.32;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 76%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 76%);
  pointer-events: none;
}

.page-about .about-hero .content-shell {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumbs {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.04em;
  color: var(--text-2);
}

.page-about .breadcrumbs a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  border-bottom-color: var(--cyan);
  color: var(--warm-white);
}

.page-about .about-crumb-sep {
  color: var(--rail-line);
}

.page-about .about-hero__stage {
  max-width: 880px;
  margin-top: clamp(28px, 5vw, 52px);
}

.page-about .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about .about-hero__title {
  position: relative;
  margin: 18px 0 0;
  padding-top: 22px;
  max-width: 15em;
  font-family: var(--font-display);
  font-size: var(--fs-h1);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--warm-white);
}

.page-about .about-hero__title::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 76px;
  height: 3px;
  background: linear-gradient(90deg, var(--gold), var(--cyan));
}

.page-about .about-hero__lede {
  margin: 24px 0 0;
  max-width: 46em;
  font-size: clamp(16px, 1.4vw, 18px);
  line-height: 1.9;
  color: var(--text-2);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: clamp(26px, 4vw, 38px);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: 1fr;
  margin-top: clamp(36px, 6vw, 64px);
  border-top: 1px solid var(--about-line);
}

.page-about .about-stat {
  padding: 20px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.6vw, 30px);
  letter-spacing: 0.02em;
  color: var(--gold);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 10px;
  font-size: var(--fs-small);
  line-height: 1.7;
  color: var(--text-2);
}

/* ---------- 通用章节 ---------- */

.page-about .about-section {
  position: relative;
  padding: var(--about-pad) 0;
}

.page-about .about-head {
  max-width: 46em;
  margin-bottom: clamp(28px, 4vw, 52px);
}

.page-about .about-head__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  font-weight: 700;
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--warm-white);
}

.page-about .about-head__lede {
  margin: 18px 0 0;
  font-size: var(--fs-body);
  line-height: 1.9;
  color: var(--text-2);
}

.page-about .about-body {
  margin: 18px 0 0;
  font-size: var(--fs-body);
  line-height: 1.92;
  color: var(--text-2);
}

.page-about .about-caption {
  display: block;
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.02em;
  line-height: 1.6;
  color: var(--text-2);
}

.page-about .about-sheet {
  background: var(--paper);
  color: var(--ink);
  border-radius: var(--radius-lg);
  padding: clamp(24px, 4.5vw, 56px);
  border: 1px solid rgba(8, 12, 24, 0.08);
  box-shadow: 0 30px 70px rgba(8, 12, 24, 0.42);
}

.page-about .about-sheet .eyebrow {
  color: #8a5a0c;
}

.page-about .about-sheet .about-body {
  color: rgba(8, 12, 24, 0.74);
}

/* ---------- 品牌起点 ---------- */

.page-about .about-origin {
  padding-top: clamp(36px, 6vw, 72px);
}

.page-about .about-origin__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-origin__title {
  margin: 14px 0 0;
  font-family: var(--font-serif);
  font-size: var(--fs-h2);
  font-weight: 700;
  line-height: 1.32;
  color: var(--ink);
}

.page-about .about-origin__figure {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--midnight);
  border: 1px solid rgba(8, 12, 24, 0.12);
}

.page-about .about-origin__figure img,
.page-about .about-team__figure img,
.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 服务准则 ---------- */

.page-about .about-rules__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-rule {
  background: var(--midnight);
  padding: clamp(22px, 3vw, 34px);
  border-left: 2px solid transparent;
  transition: border-color 0.25s ease, background-color 0.25s ease;
}

.page-about .about-rule:hover,
.page-about .about-rule:focus-within {
  border-left-color: var(--cyan);
  background-color: rgba(57, 230, 208, 0.06);
}

.page-about .about-rule__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .about-rule__title {
  margin: 12px 0 0;
  font-size: var(--fs-h3);
  font-weight: 700;
  color: var(--warm-white);
}

.page-about .about-rule__text {
  margin: 12px 0 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--text-2);
}

/* ---------- 版本演进 ---------- */

.page-about .about-track {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 30px;
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--gold) 58%, var(--rail-line));
}

.page-about .about-track__item {
  position: relative;
  padding-bottom: clamp(30px, 4vw, 48px);
}

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

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 9px;
  width: 12px;
  height: 12px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--indigo);
  border: 2px solid var(--cyan);
  transition: box-shadow 0.25s ease, background-color 0.25s ease;
}

.page-about .about-track__item:hover::before,
.page-about .about-track__item:focus-within::before {
  background: var(--cyan);
  box-shadow: 0 0 0 6px rgba(57, 230, 208, 0.16);
}

.page-about .about-track__item--now::before {
  border-color: var(--gold);
}

.page-about .about-track__item--now:hover::before {
  background: var(--gold);
  box-shadow: 0 0 0 6px rgba(232, 180, 74, 0.18);
}

.page-about .about-track__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .about-track__title {
  margin: 10px 0 0;
  font-family: var(--font-serif);
  font-size: 21px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--warm-white);
}

.page-about .about-track__text {
  margin: 12px 0 0;
  max-width: 44em;
  font-size: 16px;
  line-height: 1.92;
  color: var(--text-2);
}

.page-about .about-timeline__figure {
  margin: clamp(30px, 5vw, 56px) 0 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--midnight);
  border: 1px solid var(--about-line);
}

/* ---------- 团队协作 ---------- */

.page-about .about-team__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-team__title {
  margin: 14px 0 0;
  font-family: var(--font-serif);
  font-size: var(--fs-h2);
  font-weight: 700;
  line-height: 1.32;
  color: var(--ink);
}

.page-about .about-roles {
  list-style: none;
  margin: clamp(22px, 3.5vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.page-about .about-role {
  padding: 16px 0;
  border-top: 1px solid rgba(8, 12, 24, 0.16);
}

.page-about .about-role__name {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--ink);
}

.page-about .about-role__name::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 10px;
  vertical-align: 1px;
  background: var(--gold);
}

.page-about .about-role__desc {
  margin: 10px 0 0 18px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(8, 12, 24, 0.72);
}

.page-about .about-team__figure {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--midnight);
  border: 1px solid rgba(8, 12, 24, 0.12);
}

/* ---------- 服务范围 ---------- */

.page-about .about-reach__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-reach__card {
  padding: clamp(20px, 2.6vw, 30px);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-md);
  background: linear-gradient(160deg, rgba(20, 32, 74, 0.94), rgba(11, 21, 51, 0.62));
  transition: border-color 0.25s ease, background-color 0.25s ease;
}

.page-about .about-reach__card:hover {
  border-color: var(--line-strong);
  background-color: rgba(57, 230, 208, 0.04);
}

.page-about .about-reach__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 3.4vw, 40px);
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .about-reach__title {
  margin: 14px 0 0;
  font-size: 18px;
  font-weight: 700;
  color: var(--warm-white);
}

.page-about .about-reach__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.88;
  color: var(--text-2);
}

.page-about .about-promise {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-top: clamp(26px, 4vw, 44px);
  padding: clamp(20px, 3vw, 30px);
  border-left: 3px solid var(--gold);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: rgba(232, 180, 74, 0.07);
}

.page-about .about-promise__text {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--text-1);
}

/* ---------- 延伸入口 ---------- */

.page-about .about-next {
  background: var(--ink);
  padding: clamp(44px, 6vw, 76px) 0;
}

.page-about .about-next__title {
  margin: 0 0 clamp(20px, 3vw, 32px);
  font-family: var(--font-display);
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--warm-white);
}

.page-about .about-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.page-about .about-next__link {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 18px;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-sm);
  color: var(--text-1);
  text-decoration: none;
  font-size: 15px;
  line-height: 1.72;
  transition: border-color 0.22s ease, background-color 0.22s ease, color 0.22s ease;
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-color: var(--cyan);
  background-color: rgba(57, 230, 208, 0.07);
  color: var(--warm-white);
}

.page-about .about-next__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .about-next__label {
  min-width: 0;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(20px, 3vw, 36px);
  }

  .page-about .about-reach__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-stat {
    padding: 24px 28px 24px 0;
    border-bottom: none;
    border-right: 1px solid var(--about-line);
  }

  .page-about .about-stat:last-child {
    padding-right: 0;
    border-right: none;
  }
}

@media (min-width: 900px) {
  .page-about .about-rules__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-track {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    column-gap: clamp(22px, 3vw, 40px);
    padding: 32px 0 0;
  }

  .page-about .about-track::before {
    left: 0;
    right: 0;
    top: 6px;
    bottom: auto;
    width: auto;
    height: 2px;
    background: linear-gradient(90deg, var(--cyan), var(--gold) 58%, var(--rail-line));
  }

  .page-about .about-track__item {
    padding-bottom: 0;
  }

  .page-about .about-track__item::before {
    left: 0;
    top: -29px;
  }

  .page-about .about-reach__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-next__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px 18px;
  }
}

@media (min-width: 980px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.22fr) minmax(0, 0.78fr);
    align-items: start;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__stage {
    max-width: 920px;
  }
}
<<<END>>>