.page-about {
  --about-card-bg: rgba(16, 49, 41, .52);
  --about-card-bg-deep: rgba(7, 26, 21, .58);
  display: block;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--slate);
  padding: 0 0 22px;
}
.page-about .about-crumbs a {
  color: var(--slate);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}
.page-about .about-crumbs a:hover {
  color: var(--gold-soft);
  border-bottom-color: var(--gold-soft);
}
.page-about .about-crumbs .board-crumbs__current {
  color: var(--gold);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(96px, 12vw, 148px) 0 clamp(44px, 6vw, 80px);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -140px 0 auto 0;
  height: 640px;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(50% 60% at 80% 20%, rgba(217, 164, 65, .18), transparent 70%),
    radial-gradient(46% 56% at 10% 4%, rgba(46, 125, 107, .22), transparent 72%);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  align-items: center;
}

.page-about .about-hero__copy h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.95rem, 5.2vw, 3.5rem);
  line-height: 1.06;
  letter-spacing: -.015em;
  color: var(--cream);
  margin: 14px 0 0;
}

.page-about .about-hero__copy .board-lead {
  margin-top: 18px;
  font-size: clamp(15px, 1.6vw, 16.5px);
  line-height: 1.9;
  color: rgba(245, 238, 220, .78);
  max-width: 56ch;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-about .about-hero__facts li {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--about-card-bg);
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--slate);
}
.page-about .about-hero__facts .board-num {
  font-size: 16px;
  color: var(--gold-soft);
}

.page-about .about-hero__actions,
.page-about .about-hero__copy .board-actions {
  margin-top: 28px;
}

.page-about .about-hero__visual {
  position: relative;
  margin: 0;
}
.page-about .about-hero__visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
  clip-path: polygon(0 5%, 100% 0, 100% 95%, 0 100%);
  filter: saturate(.94) contrast(1.05);
}
.page-about .about-hero__visual::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  clip-path: polygon(0 5%, 100% 0, 100% 95%, 0 100%);
  background-image:
    linear-gradient(rgba(138, 154, 148, .16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(138, 154, 148, .16) 1px, transparent 1px);
  background-size: 54px 54px;
  mix-blend-mode: overlay;
}
.page-about .about-hero__visual figcaption {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.75;
  letter-spacing: .02em;
  color: var(--slate);
  max-width: 46ch;
}

/* ---------- 历程长卷 ---------- */
.page-about .about-trail {
  position: relative;
  padding: clamp(44px, 6vw, 84px) 0 clamp(40px, 6vw, 76px);
}

.page-about .about-trail__head {
  position: relative;
  max-width: 700px;
  margin-bottom: clamp(28px, 4vw, 48px);
}
.page-about .about-trail__head h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.55rem, 3.4vw, 2.45rem);
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--cream);
  margin: 10px 0 0;
}
.page-about .about-trail__note {
  display: none;
}

.page-about .about-trail__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

/* 左侧期数刻度 */
.page-about .about-ticks {
  display: none;
}

.page-about .about-nodes {
  display: flex;
  flex-direction: column;
  gap: clamp(20px, 3vw, 30px);
  min-width: 0;
}

/* 节点 */
.page-about .about-node {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  min-width: 0;
}
.page-about .about-node__marker {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: linear-gradient(150deg, #103129, #081D18);
  color: var(--gold-soft);
  font-size: 13px;
  letter-spacing: .04em;
}

.page-about .about-node__card {
  position: relative;
  min-width: 0;
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid var(--line-soft);
  border-radius: 18px;
  background: var(--panel-grad);
  overflow: hidden;
  transition: border-color .25s ease, transform .25s ease;
}
.page-about .about-node__card::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 28px;
  height: 28px;
  background: linear-gradient(135deg, transparent 48%, rgba(217, 164, 65, .6) 48%);
  pointer-events: none;
}
.page-about .about-node__card:hover {
  border-color: var(--line);
  transform: translateY(-2px);
}

.page-about .about-node__kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--gold);
}
.page-about .about-node__card h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.14rem, 2.3vw, 1.58rem);
  line-height: 1.28;
  color: var(--cream);
  margin: 0 0 14px;
}
.page-about .about-node__card p {
  font-size: 15.5px;
  line-height: 1.88;
  color: rgba(245, 238, 220, .8);
  margin: 0 0 14px;
}
.page-about .about-node__card p:last-child {
  margin-bottom: 0;
}
.page-about .about-node__card strong {
  color: var(--gold-soft);
  font-weight: 700;
}
.page-about .about-node__card .board-list {
  margin-top: 16px;
}
.page-about .about-node__card .board-num {
  color: var(--gold-soft);
}

/* 阶段色带 */
.page-about .about-band {
  width: min(420px, 62%);
  height: 3px;
  border-radius: 2px;
  opacity: .85;
  background: linear-gradient(90deg, var(--gold) 0%, var(--card-red) 46%, var(--card-yellow) 80%, transparent 100%);
}

/* 演进节点小卡 */
.page-about .about-milestones {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: 20px;
}
.page-about .about-milestones__item {
  padding: 16px;
  border: 1px solid var(--line-soft);
  border-top-width: 2px;
  border-top-color: var(--gold);
  border-radius: 12px;
  background: var(--about-card-bg-deep);
}
.page-about .about-milestones__item:nth-child(2) {
  border-top-color: var(--teal-soft);
}
.page-about .about-milestones__item:nth-child(3) {
  border-top-color: var(--card-yellow);
}
.page-about .about-milestones__item h4 {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--cream);
}
.page-about .about-milestones__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(245, 238, 220, .72);
}

/* 团队 */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin-top: 4px;
}
.page-about .about-team__visual {
  margin: 0;
  border: 1px solid var(--line-soft);
  border-radius: 14px;
  overflow: hidden;
}
.page-about .about-team__visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 25 / 16;
  object-fit: cover;
}
.page-about .about-team__eco {
  margin: 22px 0 0;
  padding-top: 18px;
  border-top: 1px dashed var(--line-soft);
  font-size: 14px;
  line-height: 1.82;
  color: var(--slate);
}

/* 覆盖范围 */
.page-about .about-reach {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 18px;
}
.page-about .about-reach__cell {
  padding: 18px;
  border: 1px solid var(--line-soft);
  border-radius: 14px;
  background: var(--about-card-bg);
}
.page-about .about-reach__cell h4 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.04rem;
  font-weight: 700;
  color: var(--gold-soft);
}
.page-about .about-reach__cell p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: rgba(245, 238, 220, .76);
}

/* 当期节奏配图 */
.page-about .about-cadence__visual {
  margin: 20px 0 0;
  border: 1px solid var(--line-soft);
  border-radius: 14px;
  overflow: hidden;
}
.page-about .about-cadence__visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}
.page-about .about-cadence__visual figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--line-soft);
  background: rgba(7, 26, 21, .72);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .02em;
  color: var(--slate);
}
.page-about .about-node__card .board-actions {
  margin-top: 22px;
}

/* ---------- 收束入口 ---------- */
.page-about .about-next {
  padding: clamp(36px, 5vw, 72px) 0 clamp(56px, 8vw, 104px);
}
.page-about .about-next__panel {
  padding: clamp(24px, 4vw, 44px);
  border-radius: 22px;
}
.page-about .about-next__panel h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.45rem, 3vw, 2.1rem);
  line-height: 1.2;
  color: var(--cream);
  margin: 10px 0 0;
}
.page-about .about-next__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 26px;
}
.page-about .about-next__card {
  position: relative;
  display: block;
  padding: 20px 46px 20px 20px;
  border: 1px solid var(--line-soft);
  border-radius: 14px;
  background: var(--about-card-bg-deep);
  text-decoration: none;
  transition: border-color .25s ease, transform .25s ease, background .25s ease;
}
.page-about .about-next__card:hover {
  border-color: var(--gold);
  background: var(--about-card-bg);
  transform: translateY(-3px);
}
.page-about .about-next__card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--cream);
}
.page-about .about-next__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(245, 238, 220, .72);
}
.page-about .about-next__go {
  position: absolute;
  top: 20px;
  right: 20px;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--gold);
  transition: transform .25s ease, color .25s ease;
}
.page-about .about-next__card:hover .about-next__go {
  transform: translateX(4px);
  color: var(--gold-soft);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-node {
    grid-template-columns: 60px minmax(0, 1fr);
    gap: 22px;
  }
  .page-about .about-node__marker {
    width: 60px;
    height: 60px;
    border-radius: 15px;
    font-size: 16px;
  }
  .page-about .about-milestones {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-reach {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 780px) {
  .page-about .about-next__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: clamp(24px, 3.5vw, 40px);
    align-items: center;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
    gap: clamp(34px, 5vw, 70px);
  }
}

@media (min-width: 1040px) {
  .page-about .about-trail__layout {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
  }
  .page-about .about-ticks {
    display: block;
    position: sticky;
    top: 108px;
    align-self: start;
    padding-left: 20px;
    border-left: 1px solid var(--line-soft);
  }
  .page-about .about-ticks ol {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 22px;
  }
  .page-about .about-ticks__link {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 3px;
    text-decoration: none;
    transition: transform .22s ease;
  }
  .page-about .about-ticks__link::before {
    content: "";
    position: absolute;
    left: -24px;
    top: 7px;
    width: 9px;
    height: 2px;
    background: var(--gold);
    transition: width .22s ease, background .22s ease;
  }
  .page-about .about-ticks__link:hover {
    transform: translateX(3px);
  }
  .page-about .about-ticks__link:hover::before {
    width: 16px;
    background: var(--card-red);
  }
  .page-about .about-ticks__num {
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: .12em;
    color: var(--gold);
  }
  .page-about .about-ticks__name {
    font-size: 13.5px;
    line-height: 1.5;
    color: var(--slate);
    transition: color .22s ease;
  }
  .page-about .about-ticks__link:hover .about-ticks__name {
    color: var(--cream);
  }
  .page-about .about-trail__note {
    display: block;
    position: absolute;
    right: 0;
    top: 4px;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: .34em;
    color: rgba(217, 164, 65, .58);
  }
}
<<<END>>>