.page-about {
  background: var(--bf-ink);
  color: var(--bf-mist);
  padding-bottom: clamp(48px, 8vw, 96px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(28px, 6vw, 64px) 0 clamp(34px, 6vw, 68px);
  border-bottom: 1px solid var(--bf-line);
}
.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: -2;
}
.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.24;
  filter: saturate(0.85) contrast(1.05);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(115deg, rgba(6, 32, 26, 0.97) 26%, rgba(6, 32, 26, 0.62) 68%, rgba(2, 17, 12, 0.94) 100%);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -34%;
  right: -10%;
  width: 54%;
  height: 170%;
  z-index: -1;
  pointer-events: none;
  transform: skewX(-15deg);
  background: linear-gradient(165deg, rgba(59, 242, 176, 0.16), rgba(59, 242, 176, 0) 64%);
}
.page-about .about-hero__inner {
  position: relative;
}
.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--bf-cond);
  font-weight: 800;
  font-size: clamp(30px, 6.4vw, 62px);
  line-height: 1.04;
  letter-spacing: -0.012em;
  max-width: 17em;
}
.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 34em;
  color: var(--bf-mist);
  opacity: 0.86;
  line-height: 1.75;
  font-size: clamp(14px, 2.6vw, 16px);
}
.page-about .about-hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-hero__chips li {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 7px 14px;
  border: 1px solid var(--bf-line-strong);
  border-radius: var(--bf-radius-pill);
  background: rgba(12, 46, 38, 0.6);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--bf-mint-soft);
}
.page-about .about-hero__chips span {
  font-family: var(--bf-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--bf-amber);
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

/* ---------- 主体三段式布局 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  padding-top: clamp(28px, 5vw, 56px);
}

.page-about .about-index {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
}
.page-about .about-index__label {
  display: none;
  margin: 0 0 10px;
  font-family: var(--bf-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  color: var(--bf-slate);
}
.page-about .about-index ol {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 8px 14px;
  border: 1px solid var(--bf-line);
  border-radius: var(--bf-radius-pill);
  background: rgba(12, 46, 38, 0.55);
  color: var(--bf-mint-soft);
  text-decoration: none;
  font-size: 13px;
  transition: border-color 0.2s var(--bf-ease), background 0.2s var(--bf-ease), color 0.2s var(--bf-ease);
}
.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  border-color: var(--bf-mint);
  background: rgba(59, 242, 176, 0.12);
  color: var(--bf-mist);
}
.page-about .about-index__num {
  font-family: var(--bf-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--bf-amber);
}

.page-about .about-main {
  display: grid;
  gap: clamp(34px, 6vw, 64px);
  min-width: 0;
}

.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--bf-line);
  margin-bottom: 20px;
}
.page-about .about-sec__head h2 {
  margin: 0;
  font-family: var(--bf-cond);
  font-weight: 800;
  font-size: clamp(22px, 4.2vw, 34px);
  line-height: 1.15;
  letter-spacing: -0.005em;
}
.page-about .about-sec__lede {
  margin: 0 0 22px;
  max-width: 36em;
  color: var(--bf-slate);
  line-height: 1.75;
}
.page-about .about-prose p {
  margin: 0 0 14px;
  max-width: 36em;
  line-height: 1.78;
}
.page-about .about-prose p:last-child {
  margin-bottom: 0;
}

/* ---------- 服务对象 ---------- */
.page-about .about-audience {
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-audience__item {
  padding: 18px;
  border: 1px solid var(--bf-line);
  border-radius: var(--bf-radius);
  background: var(--bf-surface);
  box-shadow: var(--bf-shadow-soft);
}
.page-about .about-audience__item h3 {
  margin: 10px 0 8px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.01em;
}
.page-about .about-audience__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--bf-mist);
  opacity: 0.82;
}

/* ---------- 四道工序 ---------- */
.page-about .about-flow {
  display: grid;
  gap: 22px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: flow;
}
.page-about .about-flow__step {
  position: relative;
  padding-top: 22px;
  border-top: 1px solid var(--bf-line-strong);
}
.page-about .about-flow__step::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 0;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--bf-mint);
  box-shadow: 0 0 0 4px rgba(59, 242, 176, 0.14);
}
.page-about .about-flow__num {
  font-family: var(--bf-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--bf-slate);
}
.page-about .about-flow__step h3 {
  margin: 8px 0 8px;
  font-family: var(--bf-cond);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--bf-mint);
}
.page-about .about-flow__step > p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--bf-mist);
  opacity: 0.82;
}
.page-about .about-flow__out {
  display: flex;
  gap: 8px;
  align-items: baseline;
  margin: 0;
  padding-top: 8px;
  border-top: 1px dashed rgba(155, 247, 214, 0.22);
  font-size: 12.5px !important;
  color: var(--bf-amber) !important;
  opacity: 1 !important;
}
.page-about .about-flow__out span {
  flex: none;
  font-family: var(--bf-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--bf-slate);
}

/* ---------- 图文对照 ---------- */
.page-about .about-split {
  display: grid;
  gap: 20px;
  margin-top: 30px;
}
.page-about .about-split .bf-media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}
.page-about .about-handle {
  padding: 20px;
  border: 1px solid var(--bf-line);
  border-radius: var(--bf-radius-lg);
  background: linear-gradient(180deg, rgba(12, 46, 38, 0.82), rgba(6, 32, 26, 0.9));
}
.page-about .about-handle h3 {
  margin: 0 0 12px;
  font-family: var(--bf-cond);
  font-size: 18px;
  letter-spacing: 0.03em;
  color: var(--bf-mint-soft);
}
.page-about .about-handle ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}
.page-about .about-handle li {
  position: relative;
  padding-left: 16px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--bf-mist);
  opacity: 0.85;
}
.page-about .about-handle li::before {
  content: "";
  position: absolute;
  top: 0.65em;
  left: 0;
  width: 6px;
  height: 6px;
  border-radius: 2px;
  background: var(--bf-amber);
}
.page-about .about-handle strong {
  color: var(--bf-mint);
  font-weight: 700;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-team__item {
  padding: 18px;
  border: 1px solid var(--bf-line);
  border-radius: var(--bf-radius-lg);
  background: rgba(12, 46, 38, 0.62);
  transition: transform 0.2s var(--bf-ease), border-color 0.2s var(--bf-ease);
}
.page-about .about-team__item:hover,
.page-about .about-team__item:focus-within {
  transform: translateY(-2px);
  border-color: var(--bf-line-strong);
}
.page-about .about-team__num {
  display: block;
  font-family: var(--bf-mono);
  font-size: clamp(26px, 5vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--bf-amber);
}
.page-about .about-team__item h3 {
  margin: 10px 0 6px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--bf-mint);
}
.page-about .about-team__item > p {
  margin: 0 0 10px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--bf-slate);
}
.page-about .about-team__list {
  margin: 0;
  padding: 10px 0 0;
  border-top: 1px solid var(--bf-line);
  list-style: none;
  display: grid;
  gap: 6px;
  opacity: 0.68;
  transition: opacity 0.2s var(--bf-ease);
}
.page-about .about-team__item:hover .about-team__list,
.page-about .about-team__item:focus-within .about-team__list {
  opacity: 1;
}
.page-about .about-team__list li {
  position: relative;
  padding-left: 13px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--bf-mist);
}
.page-about .about-team__list li::before {
  content: "";
  position: absolute;
  top: 0.6em;
  left: 0;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--bf-mint-soft);
}
.page-about .about-note-line {
  margin: 22px 0 0;
  padding-left: 16px;
  border-left: 3px solid var(--bf-amber);
  font-size: 14px;
  line-height: 1.75;
  color: var(--bf-mist);
  opacity: 0.86;
}

/* ---------- 侧栏 ---------- */
.page-about .about-aside {
  display: grid;
  gap: 14px;
  align-content: start;
  min-width: 0;
}
.page-about .about-statcard {
  padding: 16px 18px;
  border: 1px solid var(--bf-line);
  border-radius: var(--bf-radius);
  background: var(--bf-surface);
}
.page-about .about-statcard--amber {
  border-color: rgba(255, 194, 75, 0.4);
  background: linear-gradient(160deg, rgba(255, 194, 75, 0.14), rgba(12, 46, 38, 0.7));
}
.page-about .about-statcard__label {
  margin: 0;
  font-family: var(--bf-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--bf-slate);
}
.page-about .about-statcard__value {
  margin: 6px 0 0;
  font-family: var(--bf-mono);
  font-size: 32px;
  font-weight: 700;
  line-height: 1;
  color: var(--bf-mint);
}
.page-about .about-statcard__value span {
  margin-left: 6px;
  font-family: var(--bf-sans);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--bf-slate);
}
.page-about .about-statcard--amber .about-statcard__value {
  color: var(--bf-amber);
}
.page-about .about-statcard__rows {
  margin: 12px 0 0;
  padding: 10px 0 0;
  border-top: 1px solid var(--bf-line);
  list-style: none;
  display: grid;
  gap: 6px;
}
.page-about .about-statcard__rows li {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  font-size: 12.5px;
  color: var(--bf-mist);
  opacity: 0.82;
}
.page-about .about-statcard__rows b {
  font-family: var(--bf-mono);
  color: var(--bf-mint);
}
.page-about .about-statcard__foot {
  margin: 10px 0 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--bf-slate);
}
.page-about .about-links {
  display: grid;
  gap: 2px;
  padding: 16px 18px;
  border: 1px solid var(--bf-line);
  border-radius: var(--bf-radius);
  background: rgba(6, 32, 26, 0.6);
}
.page-about .about-links__title {
  margin: 0 0 8px;
  font-family: var(--bf-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--bf-slate);
}
.page-about .about-links a {
  display: block;
  padding: 8px 0;
  border-bottom: 1px solid rgba(155, 247, 214, 0.1);
  color: var(--bf-mint-soft);
  text-decoration: none;
  font-size: 13.5px;
  transition: color 0.18s var(--bf-ease), padding-left 0.18s var(--bf-ease);
}
.page-about .about-links a:last-child {
  border-bottom: 0;
}
.page-about .about-links a:hover,
.page-about .about-links a:focus-visible {
  color: var(--bf-mint);
  padding-left: 5px;
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-band {
  margin-top: clamp(38px, 7vw, 76px);
  padding: clamp(30px, 6vw, 62px) 0;
  background:
    linear-gradient(90deg, rgba(59, 242, 176, 0.06), rgba(59, 242, 176, 0) 42%),
    var(--bf-ink-2);
  border-top: 1px solid var(--bf-line);
  border-bottom: 1px solid var(--bf-line);
}
.page-about .about-band__head {
  display: grid;
  gap: 20px;
  margin-bottom: 26px;
}
.page-about .about-band__head h2 {
  margin: 8px 0 10px;
  font-family: var(--bf-cond);
  font-weight: 800;
  font-size: clamp(23px, 4.4vw, 36px);
  line-height: 1.15;
}
.page-about .about-band__head p {
  margin: 0;
  max-width: 34em;
  line-height: 1.75;
  color: var(--bf-slate);
}
.page-about .about-band__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--bf-radius);
}

.page-about .about-versions__list {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding: 4px 4px 14px;
  scroll-snap-type: x proximity;
}
.page-about .about-vnode {
  flex: 0 0 auto;
  min-width: 156px;
  display: grid;
  gap: 3px;
  text-align: left;
  padding: 14px 16px;
  border: 1px solid var(--bf-line);
  border-radius: var(--bf-radius);
  background: rgba(6, 32, 26, 0.72);
  color: var(--bf-mist);
  cursor: pointer;
  font: inherit;
  scroll-snap-align: start;
  transition: border-color 0.2s var(--bf-ease), background 0.2s var(--bf-ease), transform 0.2s var(--bf-ease);
}
.page-about .about-vnode:hover {
  transform: translateY(-2px);
  border-color: var(--bf-line-strong);
}
.page-about .about-vnode[aria-selected="true"] {
  border-color: var(--bf-mint);
  background: rgba(59, 242, 176, 0.13);
}
.page-about .about-vnode:focus-visible {
  outline: 2px solid var(--bf-mint);
  outline-offset: 2px;
}
.page-about .about-vnode__num {
  font-family: var(--bf-mono);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--bf-amber);
}
.page-about .about-vnode__name {
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.page-about .about-vnode__hint {
  font-size: 11.5px;
  color: var(--bf-slate);
}
.page-about .about-vpanel {
  margin-top: 14px;
  padding: clamp(18px, 4vw, 30px);
  border: 1px solid var(--bf-line);
  border-radius: var(--bf-radius-lg);
  background: rgba(6, 32, 26, 0.72);
}
.page-about .about-vpanel h3 {
  margin: 10px 0 10px;
  font-family: var(--bf-cond);
  font-size: clamp(19px, 3.6vw, 26px);
  letter-spacing: 0.01em;
  color: var(--bf-mist);
}
.page-about .about-vpanel > p {
  margin: 0 0 14px;
  max-width: 36em;
  line-height: 1.75;
  opacity: 0.85;
}
.page-about .about-vpanel ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}
.page-about .about-vpanel li {
  position: relative;
  padding-left: 18px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--bf-mint-soft);
}
.page-about .about-vpanel li::before {
  content: "";
  position: absolute;
  top: 0.62em;
  left: 0;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--bf-mint);
  opacity: 0.7;
}

/* ---------- 尾部 ---------- */
.page-about .about-tail {
  display: grid;
  gap: clamp(34px, 6vw, 60px);
  padding-top: clamp(36px, 6vw, 64px);
}
.page-about .about-partner {
  padding: 20px;
  border: 1px solid var(--bf-line);
  border-radius: var(--bf-radius-lg);
  background: var(--bf-surface);
}
.page-about .about-partner h3 {
  margin: 0 0 12px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--bf-mint-soft);
}
.page-about .about-partner ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}
.page-about .about-partner li {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--bf-mist);
  opacity: 0.85;
}
.page-about .about-partner strong {
  color: var(--bf-amber);
  font-weight: 700;
}
.page-about .about-partner__foot {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--bf-line);
  font-size: 13px;
  line-height: 1.72;
  color: var(--bf-slate);
}
.page-about .about-partner__foot a,
.page-about .about-cred a {
  color: var(--bf-mint);
  text-decoration: none;
  border-bottom: 1px solid rgba(59, 242, 176, 0.35);
}
.page-about .about-partner__foot a:hover,
.page-about .about-cred a:hover {
  color: var(--bf-amber);
  border-bottom-color: rgba(255, 194, 75, 0.5);
}

.page-about .about-cred {
  margin: 0;
  border-top: 1px solid var(--bf-line);
}
.page-about .about-cred__row {
  display: grid;
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px solid rgba(155, 247, 214, 0.1);
}
.page-about .about-cred dt {
  font-family: var(--bf-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--bf-slate);
}
.page-about .about-cred dd {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--bf-mist);
  opacity: 0.9;
  word-break: break-word;
}
.page-about .about-cred__note {
  margin: 16px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--bf-slate);
}

/* ---------- 断点 ---------- */
@media (min-width: 560px) {
  .page-about .about-audience {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px 20px;
  }
  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-cred__row {
    grid-template-columns: 132px minmax(0, 1fr);
    align-items: baseline;
    gap: 14px;
  }
}

@media (min-width: 900px) {
  .page-about .about-body {
    grid-template-columns: minmax(0, 1fr) 288px;
    align-items: start;
    gap: 32px;
  }
  .page-about .about-index {
    grid-column: 1 / -1;
  }
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
  }
  .page-about .about-band__head {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    align-items: end;
    gap: 32px;
  }
  .page-about .about-vnode {
    min-width: 0;
    flex: 1 1 0;
  }
}

@media (min-width: 1040px) {
  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-team {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-audience {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1200px) {
  .page-about .about-body {
    grid-template-columns: 140px minmax(0, 1fr) 288px;
    gap: 40px;
  }
  .page-about .about-index {
    grid-column: auto;
    position: sticky;
    top: calc(var(--bf-header-h) + 26px);
    display: block;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--bf-line);
    padding-left: 14px;
  }
  .page-about .about-index__label {
    display: block;
  }
  .page-about .about-index ol {
    flex-direction: column;
    gap: 2px;
  }
  .page-about .about-index__link {
    border: 0;
    border-radius: 0;
    background: none;
    padding: 8px 0;
    display: flex;
    gap: 9px;
    white-space: normal;
    font-size: 13px;
    color: var(--bf-slate);
    border-bottom: 1px solid rgba(155, 247, 214, 0.08);
  }
  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    background: none;
    color: var(--bf-mint);
    border-bottom-color: var(--bf-line-strong);
  }
  .page-about .about-aside {
    position: sticky;
    top: calc(var(--bf-header-h) + 26px);
  }
}

@media (min-width: 1320px) {
  .page-about .about-vpanel {
    padding: 34px 38px;
  }
}
<<<END>>>