.page-about {
  --about-rail: 200px;
  --about-gap: clamp(36px, 5vw, 72px);
  background: var(--bm-paper);
  color: var(--bm-text);
  padding-bottom: clamp(48px, 7vw, 112px);
}

/* ---------- 面包屑留白 ---------- */
.page-about .bm-breadcrumb {
  padding-top: clamp(16px, 2.5vw, 28px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(32px, 6vw, 72px) 0 clamp(40px, 7vw, 88px);
  border-bottom: 1px solid var(--bm-hair);
  background:
    linear-gradient(180deg, rgba(232, 220, 198, .55) 0%, rgba(243, 239, 231, 0) 78%);
  overflow: hidden;
}

.page-about .about-hero__inner {
  position: relative;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 clamp(14px, 2vw, 22px);
}

.page-about .about-hero__title {
  font-family: var(--bm-font-display);
  font-weight: 700;
  font-size: clamp(34px, 6.4vw, 76px);
  line-height: 1.08;
  letter-spacing: .005em;
  color: var(--bm-ink);
  margin: 0 0 clamp(20px, 2.6vw, 32px);
  max-width: 15ch;
}

.page-about .about-hero__lede {
  font-size: clamp(16px, 1.4vw, 19px);
  line-height: 1.8;
  color: var(--bm-text);
  max-width: 44em;
  margin: 0 0 clamp(24px, 3vw, 38px);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px clamp(18px, 3vw, 36px);
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-hero__facts li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--bm-ink-soft);
}

.page-about .about-hero__tick {
  display: block;
  width: 14px;
  height: 2px;
  background: var(--bm-amber);
  flex: none;
}

.page-about .about-hero__aside {
  position: absolute;
  right: 0;
  top: clamp(8px, 4vw, 44px);
  writing-mode: vertical-rl;
  font-family: var(--bm-font-display);
  font-size: clamp(13px, 1.2vw, 17px);
  letter-spacing: .42em;
  color: rgba(16, 36, 58, .22);
  user-select: none;
  pointer-events: none;
}

@media (max-width: 1080px) {
  .page-about .about-hero__aside { display: none; }
}

/* ---------- 双轨主体 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  padding-top: clamp(36px, 6vw, 72px);
}

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

/* ---------- 左侧发展历程栏 ---------- */
.page-about .about-rail__title {
  margin: 0 0 14px;
  font-family: var(--bm-font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--bm-danxia);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  flex-direction: row;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__item {
  flex: none;
}

.page-about .about-rail__link {
  display: block;
  min-height: 44px;
  padding: 8px 14px;
  border: 1px solid var(--bm-hair);
  border-radius: var(--bm-radius);
  background: var(--bm-card);
  text-decoration: none;
  color: var(--bm-ink);
  transition: border-color 180ms var(--bm-ease), background-color 180ms var(--bm-ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-color: var(--bm-amber);
  background: var(--bm-amber-soft);
}

.page-about .about-rail__year {
  display: block;
  font-family: var(--bm-font-mono);
  font-weight: 700;
  font-size: 13px;
  color: var(--bm-danxia);
  letter-spacing: .06em;
}

.page-about .about-rail__label {
  display: block;
  font-size: 13px;
  line-height: 1.5;
  color: var(--bm-ink-soft);
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 80px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
    padding-top: 6px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-left: 18px;
    position: relative;
  }

  .page-about .about-rail__list::before {
    content: "";
    position: absolute;
    left: 4px;
    top: 14px;
    bottom: 14px;
    width: 1px;
    background: linear-gradient(180deg, var(--bm-amber) 0%, var(--bm-danxia) 100%);
  }

  .page-about .about-rail__item {
    position: relative;
  }

  .page-about .about-rail__item::before {
    content: "";
    position: absolute;
    left: -18px;
    top: 20px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--bm-paper);
    border: 2px solid var(--bm-amber);
    box-sizing: border-box;
    transition: background-color 180ms var(--bm-ease), border-color 180ms var(--bm-ease);
  }

  .page-about .about-rail__link {
    border: 0;
    background: transparent;
    padding: 8px 0 14px;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: transparent;
    border: 0;
  }

  .page-about .about-rail__item:hover::before {
    background: var(--bm-amber);
    border-color: var(--bm-danxia);
  }

  .page-about .about-rail__link:hover .about-rail__label {
    color: var(--bm-danxia);
  }
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  margin-bottom: clamp(52px, 8vw, 104px);
}

.page-about .about-section--last {
  margin-bottom: 0;
}

.page-about .about-section__title {
  font-family: var(--bm-font-display);
  font-weight: 700;
  font-size: clamp(24px, 3.2vw, 38px);
  line-height: 1.24;
  color: var(--bm-ink);
  margin: 0 0 clamp(16px, 2vw, 24px);
  max-width: 24ch;
}

.page-about .about-section__lede {
  font-size: 16px;
  line-height: 1.85;
  color: var(--bm-text);
  margin: 0 0 clamp(24px, 3vw, 36px);
  max-width: 42em;
}

.page-about .about-subtitle {
  font-family: var(--bm-font-display);
  font-weight: 700;
  font-size: clamp(19px, 2.2vw, 24px);
  line-height: 1.35;
  color: var(--bm-ink);
  margin: 0 0 14px;
}

.page-about .bm-prose {
  margin: 0 0 1em;
}

/* ---------- 第一节：图文并排 ---------- */
.page-about .about-intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.5vw, 44px);
}

@media (min-width: 820px) {
  .page-about .about-intro {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
  }
}

.page-about .about-intro__figure {
  margin: 0;
}

.page-about .about-intro__figure .bm-figure__media {
  border: 1px solid var(--bm-hair);
}

.page-about .bm-figure__cap {
  font-size: 13px;
  line-height: 1.7;
  color: #6b7078;
  margin-top: 10px;
}

/* ---------- 图片容器统一 ---------- */
.page-about .bm-figure__media {
  overflow: hidden;
  border-radius: var(--bm-radius);
  background: linear-gradient(135deg, var(--bm-dune) 0%, var(--bm-amber-soft) 100%);
}

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

/* ---------- 第二条：三条规矩 ---------- */
.page-about .about-rules {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  border-top: 1px solid var(--bm-hair-strong);
}

.page-about .about-rule {
  border-bottom: 1px solid var(--bm-hair);
  padding: clamp(22px, 3vw, 34px) 0;
  transition: background-color 180ms var(--bm-ease);
}

.page-about .about-rule__num {
  margin: 0 0 10px;
  font-family: var(--bm-font-mono);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: .08em;
  color: var(--bm-amber);
}

.page-about .about-rule__title {
  font-family: var(--bm-font-body);
  font-weight: 700;
  font-size: clamp(17px, 1.8vw, 20px);
  line-height: 1.4;
  color: var(--bm-ink);
  margin: 0 0 10px;
}

.page-about .about-rule__text {
  font-size: 15px;
  line-height: 1.85;
  color: var(--bm-text);
  margin: 0;
  max-width: 40em;
}

@media (min-width: 760px) {
  .page-about .about-rules {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 clamp(24px, 3vw, 44px);
  }

  .page-about .about-rule {
    border-bottom: 0;
    border-top: 3px solid var(--bm-dune);
    padding-top: clamp(18px, 2.4vw, 28px);
  }

  .page-about .about-rule:hover {
    border-top-color: var(--bm-amber);
    background: rgba(247, 212, 143, .18);
  }
}

/* ---------- 色带 ---------- */
.page-about .about-band {
  margin-bottom: clamp(52px, 8vw, 104px);
}

/* ---------- 统计数字 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--bm-hair-strong);
  border: 1px solid var(--bm-hair-strong);
  margin-bottom: clamp(32px, 4vw, 52px);
}

@media (min-width: 780px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-stat {
  background: var(--bm-card);
  padding: clamp(20px, 2.6vw, 30px) clamp(16px, 2vw, 24px);
  transition: background-color 200ms var(--bm-ease);
}

.page-about .about-stat:hover {
  background: var(--bm-amber-soft);
}

.page-about .about-stat__figure {
  margin: 0 0 6px;
  line-height: 1;
}

.page-about .about-stat__figure .bm-num--lg {
  font-family: var(--bm-font-mono);
  font-weight: 700;
  font-size: clamp(38px, 5.2vw, 64px);
  letter-spacing: -.02em;
  color: var(--bm-ink);
}

.page-about .about-stat__label {
  margin: 0 0 10px;
  font-size: 14px;
  font-weight: 700;
  color: var(--bm-danxia);
  letter-spacing: .04em;
}

.page-about .about-stat__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: #6b7078;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 200ms var(--bm-ease), transform 200ms var(--bm-ease);
}

.page-about .about-stat:hover .about-stat__note,
.page-about .about-stat:focus-within .about-stat__note {
  opacity: 1;
  transform: translateY(0);
}

@media (hover: none) {
  .page-about .about-stat__note {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 师傅体系 ---------- */
.page-about .about-crew {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.5vw, 48px);
}

@media (min-width: 840px) {
  .page-about .about-crew {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: center;
  }
}

.page-about .about-crew__figure {
  margin: 0;
}

.page-about .about-crew__figure .bm-figure__media {
  border: 1px solid var(--bm-hair);
}

/* ---------- 发展历程 ---------- */
.page-about .about-wide-figure {
  margin: 0 0 clamp(32px, 4.5vw, 56px);
}

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

.page-about .about-timeline__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 0 0 clamp(28px, 4vw, 44px) 26px;
  position: relative;
  scroll-margin-top: 110px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 12px;
  bottom: -6px;
  width: 1px;
  background: linear-gradient(180deg, var(--bm-dune) 0%, rgba(232, 220, 198, .25) 100%);
}

.page-about .about-timeline__item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--bm-amber);
  border: 2px solid var(--bm-danxia);
  box-sizing: content-box;
  transition: background-color 180ms var(--bm-ease);
}

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

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

.page-about .about-timeline__item:target::after {
  background: var(--bm-danxia);
}

.page-about .about-timeline__item:target .about-timeline__title {
  color: var(--bm-danxia);
}

.page-about .about-timeline__year {
  margin: 0;
  font-family: var(--bm-font-mono);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--bm-danxia);
}

.page-about .about-timeline__title {
  font-family: var(--bm-font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.2vw, 23px);
  line-height: 1.4;
  color: var(--bm-ink);
  margin: 0 0 8px;
  transition: color 180ms var(--bm-ease);
}

.page-about .about-timeline__text {
  font-size: 15px;
  line-height: 1.85;
  color: var(--bm-text);
  margin: 0;
  max-width: 40em;
}

@media (min-width: 720px) {
  .page-about .about-timeline__item {
    grid-template-columns: 76px minmax(0, 1fr);
    gap: clamp(16px, 2.5vw, 32px);
    padding-left: 30px;
  }

  .page-about .about-timeline__year {
    text-align: right;
    padding-top: 4px;
  }
}

/* ---------- 保障区（深底 + 玻璃层） ---------- */
.page-about .about-guard {
  position: relative;
  background: var(--bm-ink);
  color: var(--bm-on-ink);
  padding: clamp(40px, 6vw, 76px) 0;
  margin-bottom: clamp(52px, 8vw, 104px);
  border-radius: var(--bm-radius);
  overflow: hidden;
}

.page-about .about-guard::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(120% 90% at 88% 6%, rgba(224, 163, 46, .22) 0%, rgba(224, 163, 46, 0) 62%);
  pointer-events: none;
}

.page-about .about-guard__inner {
  position: relative;
}

.page-about .about-guard__title {
  font-family: var(--bm-font-display);
  font-weight: 700;
  font-size: clamp(24px, 3.2vw, 38px);
  line-height: 1.24;
  color: var(--bm-card);
  margin: 0 0 14px;
  max-width: 22ch;
}

.page-about .about-guard__lede {
  font-size: 15px;
  line-height: 1.85;
  color: var(--bm-on-ink);
  margin: 0 0 clamp(26px, 3.4vw, 40px);
  max-width: 42em;
}

.page-about .about-guard__list {
  list-style: none;
  margin: 0 0 clamp(28px, 4vw, 44px);
  padding: clamp(20px, 3vw, 30px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  background: var(--bm-glass);
  border: 1px solid rgba(255, 255, 255, .35);
  border-radius: var(--bm-radius);
  backdrop-filter: blur(6px);
}

@media (min-width: 820px) {
  .page-about .about-guard__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px clamp(24px, 3vw, 40px);
  }
}

.page-about .about-guard__list li {
  font-size: 14px;
  line-height: 1.75;
  color: var(--bm-ink);
}

.page-about .about-guard__list .bm-num {
  font-family: var(--bm-font-mono);
  font-weight: 700;
  font-size: 20px;
  color: var(--bm-danxia);
  margin-right: 2px;
}

.page-about .about-guard__faq {
  display: grid;
  gap: 8px;
}

.page-about .about-guard__faq .bm-faq__item {
  border: 1px solid rgba(251, 248, 242, .22);
  border-radius: var(--bm-radius);
  background: rgba(251, 248, 242, .06);
  transition: border-color 180ms var(--bm-ease), background-color 180ms var(--bm-ease);
}

.page-about .about-guard__faq .bm-faq__item:hover,
.page-about .about-guard__faq .bm-faq__item[open] {
  border-color: var(--bm-amber);
  background: rgba(251, 248, 242, .1);
}

.page-about .about-guard__faq .bm-faq__q {
  cursor: pointer;
  list-style: none;
  padding: 16px 18px;
  min-height: 44px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.6;
  color: var(--bm-card);
}

.page-about .about-guard__faq .bm-faq__q::-webkit-details-marker {
  display: none;
}

.page-about .about-guard__faq .bm-faq__q::before {
  content: "";
  flex: none;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 2px solid var(--bm-amber);
  box-sizing: border-box;
  transition: background-color 180ms var(--bm-ease);
}

.page-about .about-guard__faq .bm-faq__item[open] .bm-faq__q::before {
  background: var(--bm-amber);
}

.page-about .about-guard__faq .bm-faq__a {
  padding: 0 18px 18px 39px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--bm-on-ink);
}

.page-about .about-guard__faq .bm-faq__a p {
  margin: 0;
}

/* ---------- 收尾 ---------- */
.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: clamp(28px, 3.6vw, 40px) 0 18px;
}

.page-about .about-actions .bm-btn {
  min-height: 44px;
}

.page-about .about-actions__more {
  font-size: 14px;
  line-height: 1.85;
  color: var(--bm-text);
  margin: 0;
  max-width: 40em;
}

/* ---------- 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-rule,
  .page-about .about-stat,
  .page-about .about-stat__note,
  .page-about .about-timeline__item::after,
  .page-about .about-timeline__title,
  .page-about .about-guard__faq .bm-faq__item,
  .page-about .about-guard__faq .bm-faq__q::before {
    transition: none;
  }

  .page-about .about-stat__note {
    transform: none;
  }
}
<<<END>>>