.page-about {
  --about-rail-w: 190px;
  --about-card-bg: #102a43;
  --about-card-bg-hover: #14324f;
  background: var(--bm-cockpit);
  color: var(--bm-cream);
  overflow-x: hidden;
}

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

.page-about .about-link {
  color: var(--bm-blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(45, 156, 255, 0.4);
  padding-bottom: 1px;
  transition: color 0.18s var(--bm-ease), border-color 0.18s var(--bm-ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--bm-orange);
  border-bottom-color: var(--bm-orange);
}

/* 面包屑条 */
.page-about .about-crumbbar {
  border-bottom: 1px solid var(--bm-line);
  background: rgba(8, 24, 38, 0.72);
}

.page-about .about-crumbbar__inner {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-top: 12px;
  padding-bottom: 12px;
  font-family: var(--bm-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .about-crumbbar .bm-crumbs__item {
  color: var(--bm-faint);
  text-decoration: none;
}

.page-about .about-crumbbar a.bm-crumbs__item:hover {
  color: var(--bm-cream);
}

.page-about .about-crumbbar__current {
  color: var(--bm-cyan);
}

.page-about .about-crumbbar__sep {
  color: var(--bm-gauge);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 5vw, 60px) 0 clamp(30px, 5vw, 68px);
  border-bottom: 1px solid var(--bm-line);
  overflow: hidden;
}

.page-about .about-hero__glow {
  position: absolute;
  top: -12%;
  right: -14%;
  width: min(760px, 90vw);
  height: 380px;
  background: radial-gradient(ellipse at 60% 40%, rgba(45, 156, 255, 0.20), rgba(255, 138, 61, 0.10) 46%, transparent 68%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 44px);
  align-items: end;
}

.page-about .about-kicker {
  margin: 0 0 14px;
  font-family: var(--bm-font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--bm-cyan);
}

.page-about .about-title {
  margin: 0;
  font-family: var(--bm-font-head);
  font-weight: 900;
  font-size: clamp(32px, 7.4vw, 74px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--bm-cream);
}

.page-about .about-title__accent {
  display: block;
  color: var(--bm-orange);
}

.page-about .about-hero__text {
  margin: 20px 0 0;
  max-width: 58ch;
  font-size: clamp(15px, 1.2vw, 17px);
  line-height: 1.85;
  color: var(--bm-dim);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-meta__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--bm-font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--bm-faint);
}

.page-about .about-meta__item::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--bm-cyan);
  box-shadow: 0 0 8px rgba(99, 215, 232, 0.7);
}

.page-about .about-hero__media {
  border: 1px solid var(--bm-line-2);
}

.page-about .about-hero__vertical {
  display: none;
  position: absolute;
  top: 50%;
  left: 8px;
  margin: 0;
  writing-mode: vertical-rl;
  transform: translateY(-50%);
  font-family: var(--bm-font-mono);
  font-size: 10px;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: rgba(201, 210, 220, 0.28);
}

/* 主体网格与锚点轨 */
.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 48px);
  padding: clamp(30px, 5vw, 64px) 0 clamp(40px, 6vw, 84px);
}

.page-about .about-rail {
  align-self: start;
  border-left: 1px solid var(--bm-line);
  padding-left: 14px;
}

.page-about .about-rail__label {
  margin: 0 0 10px;
  font-family: var(--bm-font-mono);
  font-size: 10px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--bm-faint);
}

.page-about .about-rail__list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .bm-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 5px 0;
  font-size: 13px;
  color: var(--bm-faint);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--bm-ease), border-color 0.18s var(--bm-ease);
}

.page-about .bm-rail__num {
  font-family: var(--bm-font-mono);
  font-size: 10px;
  color: var(--bm-gauge);
}

.page-about .bm-rail__link:hover,
.page-about .bm-rail__link:focus-visible,
.page-about .bm-rail__link.is-active {
  color: var(--bm-cream);
  border-bottom-color: var(--bm-orange);
}

.page-about .bm-rail__link.is-active .bm-rail__num {
  color: var(--bm-orange);
}

.page-about .about-rail__meta {
  display: none;
  margin: 20px 0 0;
  font-family: var(--bm-font-mono);
  font-size: 11px;
  line-height: 1.9;
  letter-spacing: 0.08em;
  color: var(--bm-gauge);
}

/* 章节 */
.page-about .about-chapter {
  padding-bottom: clamp(34px, 5vw, 64px);
  margin-bottom: clamp(34px, 5vw, 64px);
  border-bottom: 1px solid var(--bm-line);
}

.page-about .about-chapter--last {
  border-bottom: 0;
  padding-bottom: clamp(10px, 2vw, 20px);
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .about-head {
  margin: 0 0 20px;
}

.page-about .about-num {
  margin: 0 0 10px;
  font-family: var(--bm-font-mono);
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--bm-orange);
}

.page-about .about-h2 {
  margin: 0;
  font-family: var(--bm-font-head);
  font-weight: 800;
  font-size: clamp(23px, 3.4vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--bm-cream);
}

.page-about .about-lead {
  margin: 14px 0 0;
  max-width: 60ch;
  font-size: clamp(14px, 1.15vw, 16px);
  line-height: 1.85;
  color: var(--bm-dim);
}

.page-about .about-body p {
  margin: 0 0 14px;
  max-width: 66ch;
  font-size: clamp(14px, 1.1vw, 16px);
  line-height: 1.9;
  color: var(--bm-dim);
}

.page-about .about-body__tail {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--bm-dim);
}

/* 数据卡 */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 26px;
  background: var(--bm-line);
  border: 1px solid var(--bm-line);
}

.page-about .about-stat {
  padding: 16px 14px 18px;
  background: var(--about-card-bg);
  outline: none;
  transition: background 0.2s var(--bm-ease);
}

.page-about .about-stat:hover,
.page-about .about-stat:focus-visible {
  background: var(--about-card-bg-hover);
}

.page-about .about-stat:focus-visible {
  box-shadow: inset 0 0 0 1px var(--bm-orange);
}

.page-about .about-stat__num {
  margin: 0;
  font-family: var(--bm-font-mono);
  font-weight: 600;
  font-size: clamp(24px, 3.2vw, 36px);
  line-height: 1.1;
  color: var(--bm-cyan);
  letter-spacing: -0.01em;
}

.page-about .about-stat--accent .about-stat__num {
  color: var(--bm-orange);
}

.page-about .about-stat__label {
  margin: 8px 0 0;
  font-family: var(--bm-font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--bm-silver);
}

.page-about .about-stat__note {
  margin: 10px 0 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--bm-faint);
  transition: color 0.2s var(--bm-ease);
}

.page-about .about-stat:hover .about-stat__note {
  color: var(--bm-dim);
}

/* 分类清单 */
.page-about .about-cats {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--bm-line-2);
}

.page-about .about-cat {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 4px 12px;
  padding: 15px 0;
  border-bottom: 1px solid var(--bm-line);
  position: relative;
}

.page-about .about-cat::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 0;
  height: 1px;
  background: var(--bm-orange);
  transition: width 0.24s var(--bm-ease);
}

.page-about .about-cat:hover::after {
  width: 56px;
}

.page-about .about-cat__idx {
  font-family: var(--bm-font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--bm-gauge);
  padding-top: 4px;
}

.page-about .about-cat__name {
  font-family: var(--bm-font-head);
  font-weight: 700;
  font-size: 16px;
  color: var(--bm-cream);
}

.page-about .about-cat__desc {
  grid-column: 2;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--bm-dim);
}

.page-about .about-band {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  margin-top: 24px;
  padding: 16px 18px;
  border-left: 2px solid var(--bm-orange);
  background: linear-gradient(90deg, rgba(45, 156, 255, 0.13), rgba(255, 138, 61, 0.07) 60%, transparent);
}

.page-about .about-band__item {
  margin: 0;
  font-family: var(--bm-font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--bm-silver);
}

.page-about .about-band__num {
  color: var(--bm-cream);
  font-weight: 600;
}

/* 色板 */
.page-about .about-swatches {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 26px;
}

.page-about .about-swatch {
  border: 1px solid var(--bm-line);
  background: rgba(16, 42, 67, 0.5);
}

.page-about .about-swatch__chip {
  display: block;
  height: 58px;
}

.page-about .about-swatch__label {
  display: block;
  padding: 7px 8px 8px;
  font-family: var(--bm-font-mono);
  font-size: 10px;
  letter-spacing: 0.05em;
  color: var(--bm-faint);
}

.page-about .about-swatch--cockpit .about-swatch__chip { background: #081826; box-shadow: inset 0 0 0 1px rgba(201,210,220,0.12); }
.page-about .about-swatch--deep .about-swatch__chip { background: #102a43; }
.page-about .about-swatch--silver .about-swatch__chip { background: #c9d2dc; }
.page-about .about-swatch--blue .about-swatch__chip { background: #2d9cff; }
.page-about .about-swatch--orange .about-swatch__chip { background: #ff8a3d; }
.page-about .about-swatch--moss .about-swatch__chip { background: #5c7a6a; }

/* 团队与通用标签页 */
.page-about .about-team__media {
  margin: 0 0 24px;
  border: 1px solid var(--bm-line-2);
}

.page-about .about-roles {
  margin-top: 4px;
}

.page-about .about-roles__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--bm-line);
}

.page-about .about-roletab {
  padding: 8px 13px;
  font-family: var(--bm-font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--bm-dim);
  background: transparent;
  border: 1px solid var(--bm-line-2);
  border-radius: 0;
  cursor: pointer;
  transition: color 0.18s var(--bm-ease), border-color 0.18s var(--bm-ease), background 0.18s var(--bm-ease);
}

.page-about .about-roletab:hover {
  color: var(--bm-cream);
  border-color: var(--bm-silver);
}

.page-about .about-roletab.is-active,
.page-about .about-roletab[aria-selected="true"] {
  color: var(--bm-cockpit);
  background: var(--bm-orange);
  border-color: var(--bm-orange);
}

.page-about .about-panel {
  padding: 18px 0 4px;
  border-bottom: 1px solid var(--bm-line);
}

.page-about .about-panel__title {
  margin: 0 0 8px;
  font-family: var(--bm-font-head);
  font-weight: 700;
  font-size: 16px;
  color: var(--bm-cream);
}

.page-about .about-panel p {
  margin: 0;
  max-width: 64ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--bm-dim);
}

/* 版本时间轴 */
.page-about .about-timeline {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
}

.page-about .about-node {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 10px 14px 0;
  text-align: left;
  background: transparent;
  border: 0;
  border-top: 2px solid var(--bm-line-2);
  border-radius: 0;
  cursor: pointer;
  transition: border-color 0.2s var(--bm-ease), background 0.2s var(--bm-ease);
}

.page-about .about-node:hover {
  background: rgba(45, 156, 255, 0.06);
}

.page-about .about-node.is-active,
.page-about .about-node[aria-selected="true"] {
  border-top-color: var(--bm-orange);
  background: linear-gradient(180deg, rgba(255, 138, 61, 0.10), transparent 80%);
}

.page-about .about-node__tag {
  font-family: var(--bm-font-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  color: var(--bm-cyan);
}

.page-about .about-node__title {
  font-family: var(--bm-font-head);
  font-weight: 700;
  font-size: 14px;
  line-height: 1.4;
  color: var(--bm-silver);
}

.page-about .about-node.is-active .about-node__title,
.page-about .about-node[aria-selected="true"] .about-node__title {
  color: var(--bm-cream);
}

.page-about .about-vpanel {
  padding: 20px 0 4px;
}

.page-about .about-vfigure {
  margin: 22px 0 0;
  border: 1px solid var(--bm-line);
}

/* 承诺 */
.page-about .about-promise {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--bm-line);
  border: 1px solid var(--bm-line);
}

.page-about .about-promise__item {
  padding: 16px 16px 18px;
  background: var(--about-card-bg);
}

.page-about .about-promise__num {
  margin: 0;
  font-family: var(--bm-font-mono);
  font-weight: 600;
  font-size: 22px;
  color: var(--bm-orange);
  letter-spacing: 0.01em;
}

.page-about .about-promise__text {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--bm-dim);
}

/* 结尾引导 */
.page-about .about-cta {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: clamp(18px, 3vw, 30px);
  padding: clamp(22px, 4vw, 40px);
  border: 1px solid var(--bm-line-2);
  background:
    radial-gradient(ellipse at 90% 10%, rgba(255, 138, 61, 0.16), transparent 60%),
    linear-gradient(135deg, rgba(16, 42, 67, 0.95), rgba(8, 24, 38, 0.7));
}

.page-about .about-cta__kicker {
  margin: 0 0 10px;
  font-family: var(--bm-font-mono);
  font-size: 10px;
  letter-spacing: 0.28em;
  color: var(--bm-cyan);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--bm-font-head);
  font-weight: 800;
  font-size: clamp(20px, 2.6vw, 30px);
  line-height: 1.28;
  color: var(--bm-cream);
}

.page-about .about-cta__desc {
  margin: 12px 0 0;
  max-width: 52ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--bm-dim);
}

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

/* 响应式 */
@media (min-width: 640px) {
  .page-about .about-promise {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-swatches {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .about-cat {
    grid-template-columns: 40px 130px minmax(0, 1fr);
    align-items: baseline;
  }

  .page-about .about-cat__desc {
    grid-column: 3;
  }
}

@media (min-width: 900px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  }

  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
  }

  .page-about .about-rail {
    position: sticky;
    top: 112px;
    padding-right: 8px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
  }

  .page-about .bm-rail__link {
    display: flex;
    width: 100%;
    padding: 9px 0;
    border-bottom: 1px solid var(--bm-line);
  }

  .page-about .about-rail__meta {
    display: block;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__vertical {
    display: block;
  }

  .page-about .about-hero__inner {
    padding-left: 34px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-cat::after,
  .page-about .about-stat,
  .page-about .about-node,
  .page-about .about-roletab {
    transition: none;
  }
}
<<<END>>>