.page-about {
  --about-hero-ink: #F3ECDE;
  --about-hero-ink-soft: rgba(243, 236, 222, .82);
  --about-rule: rgba(28, 90, 68, .22);
  background-color: var(--bv-sand);
  color: var(--bv-ink);
  overflow-x: hidden;
}

/* ---------- 首屏主题带 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 32px 0 52px;
  background:
    radial-gradient(130% 90% at 90% -12%, rgba(184, 115, 51, .30) 0%, rgba(184, 115, 51, 0) 58%),
    linear-gradient(168deg, #123B2E 0%, #0D2C22 60%, #123B2E 100%);
  color: var(--about-hero-ink);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-radial-gradient(circle at 6% 132%, rgba(201, 217, 200, .15) 0 1px, transparent 1px 48px),
    repeating-radial-gradient(circle at 108% -10%, rgba(227, 169, 106, .12) 0 1px, transparent 1px 62px);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--bv-font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: rgba(243, 236, 222, .62);
}

.page-about .about-breadcrumb a {
  color: var(--bv-copper-lt);
  text-decoration: none;
}

.page-about .about-breadcrumb a:hover,
.page-about .about-breadcrumb a:focus-visible {
  text-decoration: underline;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 30px;
  margin-top: 24px;
}

.page-about .about-hero__copy h1 {
  margin: 14px 0 0;
  font-family: var(--bv-font-display);
  font-size: clamp(30px, 7.6vw, 52px);
  line-height: 1.16;
  letter-spacing: -.02em;
  font-weight: 800;
}

.page-about .about-hero__lead {
  margin: 16px 0 0;
  font-size: clamp(15px, 3.6vw, 17px);
  line-height: 1.8;
  color: var(--about-hero-ink-soft);
  max-width: 44ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero .bv-btn--ghost {
  color: var(--about-hero-ink);
  border-color: rgba(227, 169, 106, .55);
}

.page-about .about-hero .bv-btn--ghost:hover,
.page-about .about-hero .bv-btn--ghost:focus-visible {
  border-color: var(--bv-copper-lt);
  color: var(--bv-copper-lt);
}

.page-about .about-hero__media {
  margin: 0;
  border-radius: var(--bv-r-lg);
  border: 1px solid rgba(227, 169, 106, .4);
  overflow: hidden;
  background: rgba(252, 248, 240, .06);
}

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

/* ---------- 平台定位 ---------- */
.page-about .about-position__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-position__aside {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 22px;
  border-radius: var(--bv-r-md);
  background: var(--bv-sand);
  border-left: 4px solid var(--bv-copper);
}

.page-about .about-position__quote {
  margin: 0;
  font-family: var(--bv-font-display);
  font-size: clamp(19px, 4.4vw, 23px);
  line-height: 1.5;
  letter-spacing: -.01em;
  color: var(--bv-green);
  font-weight: 700;
}

.page-about .about-position__meta {
  margin: 0;
  font-family: var(--bv-font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--bv-gray);
}

.page-about .about-position__body h2,
.page-about .about-source__body h2,
.page-about .about-team__body h2 {
  margin: 12px 0 0;
  font-family: var(--bv-font-display);
  font-size: clamp(24px, 5.4vw, 34px);
  line-height: 1.28;
  letter-spacing: -.02em;
  color: var(--bv-green);
}

.page-about .about-position__body p,
.page-about .about-source__body p,
.page-about .about-team__body p {
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--bv-ink);
}

/* ---------- 内容体系 ---------- */
.page-about .about-system__grid {
  display: grid;
  gap: 24px;
  margin-top: 30px;
}

.page-about .about-system__media {
  margin: 0;
  border-radius: var(--bv-r-lg);
  overflow: hidden;
  border: 1px solid rgba(28, 90, 68, .24);
  background: var(--bv-cream);
}

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

.page-about .about-system__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-system__item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 18px 18px 16px;
  border: 1px solid var(--about-rule);
  border-radius: var(--bv-r-md);
  background: var(--bv-cream);
  transition: transform var(--bv-dur) var(--bv-ease), border-color var(--bv-dur) var(--bv-ease), box-shadow var(--bv-dur) var(--bv-ease);
}

.page-about .about-system__item:hover,
.page-about .about-system__item:focus-within {
  transform: translateY(-2px);
  border-color: var(--bv-copper);
  box-shadow: var(--bv-shadow);
}

.page-about .about-system__no {
  display: block;
  padding-top: 7px;
  font-family: var(--bv-font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  font-weight: 700;
  color: var(--bv-copper);
  border-top: 2px solid var(--bv-copper);
}

.page-about .about-system__text h3 {
  margin: 0;
  font-family: var(--bv-font-display);
  font-size: 18px;
  line-height: 1.4;
  letter-spacing: -.01em;
  color: var(--bv-green);
}

.page-about .about-system__text p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--bv-ink);
}

.page-about .about-system__link {
  display: inline-block;
  margin-top: 10px;
  font-family: var(--bv-font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--bv-blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 110, 144, .4);
}

.page-about .about-system__link:hover,
.page-about .about-system__link:focus-visible {
  color: var(--bv-green);
  border-bottom-color: var(--bv-green);
}

/* ---------- 数据规模带 ---------- */
.page-about .about-scale {
  padding: 0 0 8px;
  background: var(--bv-sand);
}

.page-about .about-scale__band {
  display: grid;
  gap: 18px;
  padding: 26px var(--bv-gutter);
  border-radius: var(--bv-r-lg);
  border: 1px solid rgba(184, 115, 51, .35);
  background: linear-gradient(150deg, #143F31 0%, #0F3227 100%);
  color: var(--about-hero-ink);
}

.page-about .about-scale__item {
  position: relative;
  padding: 4px 0;
  min-width: 0;
}

.page-about .about-scale__num {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 0;
  font-family: var(--bv-font-mono);
  font-size: clamp(26px, 6.4vw, 36px);
  font-weight: 700;
  letter-spacing: .02em;
  line-height: 1.1;
  color: var(--bv-copper-lt);
}

.page-about .about-scale__unit {
  font-size: .46em;
  letter-spacing: .08em;
  color: rgba(243, 236, 222, .72);
}

.page-about .about-scale__cap {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: .04em;
  color: rgba(243, 236, 222, .74);
}

/* ---------- 数据来源 ---------- */
.page-about .about-source__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-source__side {
  padding: 22px;
  border-radius: var(--bv-r-md);
  background: var(--bv-sand);
  border: 1px solid var(--about-rule);
}

.page-about .about-source__side-title {
  margin: 0 0 16px;
  font-family: var(--bv-font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--bv-blue);
}

.page-about .about-source__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 2px solid var(--bv-blue);
}

.page-about .about-source__steps li {
  position: relative;
  padding: 0 0 20px 20px;
  display: grid;
  gap: 4px;
}

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

.page-about .about-source__steps li::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bv-cream);
  border: 2px solid var(--bv-blue);
}

.page-about .about-source__step-t {
  font-family: var(--bv-font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  font-weight: 700;
  color: var(--bv-green);
}

.page-about .about-source__step-d {
  font-size: 14px;
  line-height: 1.7;
  color: var(--bv-ink);
}

/* ---------- 发展历程 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 30px 0 0;
  padding: 0 0 0 22px;
  border-left: 2px solid var(--bv-line);
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  gap: 6px;
  padding: 0 0 30px 8px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 5px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bv-cream);
  border: 2px solid var(--bv-copper);
  transition: transform var(--bv-dur) var(--bv-ease), background var(--bv-dur) var(--bv-ease);
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  transform: scale(1.3);
  background: var(--bv-copper);
}

.page-about .about-timeline__year {
  margin: 0;
  font-family: var(--bv-font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--bv-copper);
}

.page-about .about-timeline__body h3 {
  margin: 0;
  font-family: var(--bv-font-display);
  font-size: 18px;
  line-height: 1.42;
  letter-spacing: -.01em;
  color: var(--bv-green);
}

.page-about .about-timeline__body p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--bv-ink);
  max-width: 62ch;
}

.page-about .about-timeline__detail {
  color: var(--bv-gray);
  font-size: 14px;
}

/* 悬停/聚焦展开补充说明，触屏与静态场景完整可见 */
@media (hover: hover) and (pointer: fine) {
  .page-about .about-timeline__detail {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height var(--bv-dur) var(--bv-ease), opacity var(--bv-dur) var(--bv-ease), margin var(--bv-dur) var(--bv-ease);
    margin-top: 0;
  }

  .page-about .about-timeline__item:hover .about-timeline__detail,
  .page-about .about-timeline__item:focus-within .about-timeline__detail {
    max-height: 140px;
    opacity: 1;
    margin-top: 8px;
  }
}

/* ---------- 服务团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-team__roles {
  margin: 22px 0 0;
  display: grid;
  gap: 12px;
}

.page-about .about-team__role {
  padding: 16px 18px;
  border-radius: var(--bv-r-sm);
  background: var(--bv-sand);
  border-left: 3px solid var(--bv-green-2);
}

.page-about .about-team__role dt {
  font-family: var(--bv-font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  font-weight: 700;
  color: var(--bv-green);
}

.page-about .about-team__role dd {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--bv-ink);
}

.page-about .about-team__media {
  margin: 0;
  border-radius: var(--bv-r-lg);
  overflow: hidden;
  border: 1px solid var(--about-rule);
  background: var(--bv-sand);
}

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

/* ---------- 服务范围与合作 ---------- */
.page-about .about-eco__list {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-eco__item {
  padding: 20px;
  border-radius: var(--bv-r-md);
  background: var(--bv-cream);
  border: 1px solid var(--about-rule);
}

.page-about .about-eco__item p {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--bv-ink);
}

/* ---------- 下一步 ---------- */
.page-about .about-cta {
  padding-top: 0;
  background: var(--bv-sand);
}

.page-about .about-cta__panel {
  display: grid;
  gap: 22px;
  padding: 30px var(--bv-gutter);
  border-radius: var(--bv-r-lg);
  background: linear-gradient(150deg, #143F31 0%, #0F3227 100%);
  color: var(--about-hero-ink);
  border: 1px solid rgba(184, 115, 51, .35);
}

.page-about .about-cta__text h2 {
  margin: 12px 0 0;
  font-family: var(--bv-font-display);
  font-size: clamp(23px, 5.2vw, 32px);
  line-height: 1.3;
  letter-spacing: -.02em;
  color: var(--about-hero-ink);
}

.page-about .about-cta__text p {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-hero-ink-soft);
  max-width: 52ch;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

.page-about .about-cta .bv-btn--ghost {
  color: var(--about-hero-ink);
  border-color: rgba(227, 169, 106, .55);
}

.page-about .about-cta .bv-btn--ghost:hover,
.page-about .about-cta .bv-btn--ghost:focus-visible {
  border-color: var(--bv-copper-lt);
  color: var(--bv-copper-lt);
}

/* ---------- 平板 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero {
    padding: 40px 0 68px;
  }

  .page-about .about-scale__band {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px 8px;
    padding: 32px 30px;
  }

  .page-about .about-scale__item:nth-child(2n) {
    padding-left: 26px;
    border-left: 1px solid rgba(201, 217, 200, .22);
  }

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

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

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

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, .96fr);
    gap: 48px;
    align-items: center;
    margin-top: 30px;
  }

  .page-about .about-position__grid {
    grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-position__aside {
    position: sticky;
    top: 96px;
  }

  .page-about .about-system__grid {
    grid-template-columns: minmax(0, .86fr) minmax(0, 1.14fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .about-system__media {
    position: sticky;
    top: 96px;
  }

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

  .page-about .about-scale__band {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 8px;
    padding: 36px 34px;
  }

  .page-about .about-scale__item {
    padding-left: 26px;
    border-left: 1px solid rgba(201, 217, 200, .22);
  }

  .page-about .about-scale__item:first-child {
    padding-left: 0;
    border-left: 0;
  }

  .page-about .about-source__grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-timeline {
    margin-top: 38px;
    padding-left: 26px;
  }

  .page-about .about-timeline__item {
    grid-template-columns: 118px minmax(0, 1fr);
    gap: 34px;
    padding-bottom: 34px;
  }

  .page-about .about-timeline__year {
    padding-top: 2px;
    text-align: left;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
    gap: 48px;
    align-items: center;
  }

  .page-about .about-cta__panel {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, .7fr);
    gap: 36px;
    align-items: center;
    padding: 40px 38px;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-system__item,
  .page-about .about-timeline__item::before {
    transition: none;
  }

  .page-about .about-system__item:hover,
  .page-about .about-system__item:focus-within {
    transform: none;
  }

  .page-about .about-timeline__item:hover::before,
  .page-about .about-timeline__item:focus-within::before {
    transform: none;
  }
}
<<<END>>>