.page-about {
  position: relative;
  color: var(--white);
  background:
    radial-gradient(120% 55% at 8% 0%, rgba(23, 61, 51, 0.95) 0%, rgba(10, 31, 26, 0) 62%),
    linear-gradient(180deg, var(--ink-800) 0%, var(--ink-900) 58%, var(--ink-800) 100%);
  padding-bottom: clamp(2.5rem, 7vw, 5rem);
}

.page-about .about-topbar {
  padding-top: clamp(1.125rem, 4vw, 1.875rem);
  min-width: 0;
}

.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.25rem);
  padding-top: clamp(1rem, 3vw, 1.75rem);
  align-items: start;
  min-width: 0;
}

@media (min-width: 1000px) {
  .page-about .about-shell {
    grid-template-columns: minmax(0, 10.5rem) minmax(0, 1fr);
    column-gap: clamp(2rem, 5vw, 4rem);
  }
}

/* ---------- 左侧年份刻度 ---------- */
.page-about .about-aside {
  display: none;
}

@media (min-width: 1000px) {
  .page-about .about-aside {
    display: block;
    position: sticky;
    top: clamp(5rem, 11vh, 7rem);
    padding-top: clamp(2rem, 7vh, 4.5rem);
  }
}

.page-about .about-aside__caption {
  writing-mode: vertical-rl;
  font-size: 0.7rem;
  letter-spacing: var(--tracking);
  color: var(--gold);
  opacity: 0.85;
  margin: 0 0 1.25rem;
}

.page-about .year-axis {
  list-style: none;
  margin: 0;
  padding: 0 0 0 1.3rem;
  border-left: 1px solid var(--line);
}

.page-about .year-axis__item {
  position: relative;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--grey);
  padding: 0.95rem 0;
}

.page-about .year-axis__item::before {
  content: "";
  position: absolute;
  left: -1.3rem;
  top: 1.2rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: 1px solid rgba(227, 180, 92, 0.55);
  background: var(--ink-800);
  transform: translateX(-50%);
}

.page-about .year-axis__item.is-current {
  color: var(--gold-soft);
  font-weight: 700;
}

.page-about .year-axis__item.is-current::before {
  background: var(--gold);
  border-color: var(--gold);
  box-shadow: 0 0 0 4px rgba(227, 180, 92, 0.16);
}

/* ---------- 右侧叙事画布 ---------- */
.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: clamp(0.9rem, 2.4vw, 1.6rem);
  min-width: 0;
}

.page-about .about-hero {
  padding-bottom: clamp(1rem, 3vw, 1.75rem);
  min-width: 0;
}

.page-about .about-hero .display {
  margin: 0.7rem 0 1.25rem;
  max-width: 20ch;
}

.page-about .about-hero__lede {
  max-width: 44ch;
  margin: 0;
  font-size: clamp(1rem, 1.4vw, 1.125rem);
  line-height: 1.85;
  color: rgba(247, 251, 249, 0.84);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(0.75rem, 2.5vw, 1.35rem);
  list-style: none;
  margin: clamp(1.5rem, 4vw, 2.25rem) 0 0;
  padding: 0;
}

@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-stats > li {
  border-top: 1px solid rgba(227, 180, 92, 0.35);
  padding-top: 0.7rem;
  min-width: 0;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 2.6vw, 1.8rem);
  line-height: 1.15;
  color: var(--gold-soft);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  line-height: 1.55;
  color: var(--grey);
}

/* ---------- 章节切面 ---------- */
.page-about .about-chapter {
  position: relative;
  min-width: 0;
  padding: clamp(1.4rem, 3.6vw, 2.75rem) clamp(1.15rem, 3.2vw, 2.5rem) clamp(1.6rem, 4vw, 3rem);
  border-radius: var(--radius-xl);
  border: 1px solid var(--line);
  background:
    linear-gradient(108deg,
      rgba(10, 31, 26, 0.95) 0%,
      rgba(23, 61, 51, calc(0.3 + var(--step, 0) * 0.11)) 58%,
      rgba(244, 239, 228, calc(0.02 + var(--step, 0) * 0.018)) 100%);
  box-shadow: inset 0 1px 0 rgba(247, 251, 249, 0.05);
}

.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
  margin-bottom: clamp(0.9rem, 2vw, 1.35rem);
  flex-wrap: wrap;
}

.page-about .about-index {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .about-chapter__title {
  margin: 0;
  font-size: clamp(1.3rem, 2.6vw, 1.75rem);
  line-height: 1.35;
  font-weight: 900;
  letter-spacing: 0.01em;
}

.page-about .about-chapter p {
  max-width: 46ch;
  margin: 0 0 1rem;
  line-height: 1.82;
  color: rgba(247, 251, 249, 0.82);
}

.page-about .about-chapter p:last-child {
  margin-bottom: 0;
}

.page-about .about-lead {
  font-size: clamp(0.98rem, 1.3vw, 1.05rem);
  color: rgba(247, 251, 249, 0.88);
}

.page-about .about-chapter a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(79, 224, 200, 0.42);
  transition: color 0.2s ease-out, border-color 0.2s ease-out;
}

.page-about .about-chapter a:hover {
  color: var(--gold-soft);
  border-bottom-color: rgba(227, 180, 92, 0.72);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 clamp(1.1rem, 2.6vw, 1.75rem);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--ink-900);
  box-shadow: var(--shadow-deep), 0 0 0 1px rgba(227, 180, 92, 0.13);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.94) contrast(1.04);
}

.page-about .about-figure__caption {
  display: block;
  padding: 0.7rem 1rem 0.85rem;
  font-size: 0.78rem;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--grey);
  background: rgba(10, 31, 26, 0.82);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 1.35rem;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75rem;
  bottom: 0.75rem;
  width: 1px;
  background: linear-gradient(180deg, rgba(227, 180, 92, 0.85), rgba(79, 224, 200, 0.45) 55%, rgba(79, 224, 200, 0));
}

.page-about .about-timeline__item {
  position: relative;
  min-width: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -1.35rem;
  top: 1.55rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ink-800);
  border: 1px solid rgba(227, 180, 92, 0.7);
  transform: translateX(-50%);
  transition: background 0.22s ease-out, box-shadow 0.22s ease-out;
}

.page-about .about-timeline__item:has(.about-node[open])::before {
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(227, 180, 92, 0.16);
}

.page-about .about-timeline__item + .about-timeline__item {
  border-top: 1px solid var(--line);
}

.page-about .about-node__summary {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 0.95rem 0;
  cursor: pointer;
  list-style: none;
}

.page-about .about-node__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-node__year {
  flex: 0 0 4.5rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.05em;
  color: var(--gold);
}

.page-about .about-node__label {
  font-weight: 700;
  font-size: clamp(0.95rem, 1.6vw, 1.05rem);
  line-height: 1.55;
  color: var(--white);
}

.page-about .about-node__summary::after {
  content: "+";
  margin-left: auto;
  flex: none;
  width: 1.65rem;
  height: 1.65rem;
  border-radius: var(--pill);
  border: 1px solid rgba(79, 224, 200, 0.45);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: 1.42rem;
  text-align: center;
  transition: background 0.22s ease-out;
}

.page-about .about-node[open] .about-node__summary::after {
  content: "\2212";
  background: rgba(79, 224, 200, 0.14);
}

.page-about .about-node[open] .about-node__summary {
  padding-bottom: 0.4rem;
}

.page-about .about-node__body {
  padding: 0 2.8rem 1.25rem 5.5rem;
  animation: about-node-in 0.22s ease-out both;
}

.page-about .about-node__body p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: rgba(247, 251, 249, 0.78);
}

@keyframes about-node-in {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 620px) {
  .page-about .about-node__body {
    padding-left: 0;
    padding-right: 0;
  }
  .page-about .about-node__summary {
    gap: 0.75rem;
  }
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.25rem, 3vw, 2rem);
  align-items: center;
  margin-bottom: clamp(1.25rem, 3vw, 1.75rem);
}

@media (min-width: 760px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 12rem) minmax(0, 1fr);
  }
}

.page-about .about-ring {
  position: relative;
  width: min(11rem, 58%);
  margin: 0 auto;
  aspect-ratio: 1;
}

.page-about .about-ring svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-ring__center {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

.page-about .about-ring__num {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3vw, 1.75rem);
  line-height: 1;
  color: var(--gold-soft);
}

.page-about .about-ring__cap {
  margin-top: 0.35rem;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--grey);
}

.page-about .about-duties {
  list-style: none;
  margin: 0;
  padding: 0;
  min-width: 0;
}

.page-about .about-duty {
  padding: 0.9rem 1rem;
  border-radius: var(--radius-md);
  border-left: 2px solid transparent;
  transition: background 0.22s ease-out;
}

.page-about .about-duty + .about-duty {
  margin-top: 0.35rem;
}

.page-about .about-duty:nth-child(1) {
  border-left-color: rgba(227, 180, 92, 0.7);
}

.page-about .about-duty:nth-child(2) {
  border-left-color: rgba(79, 224, 200, 0.7);
}

.page-about .about-duty:nth-child(3) {
  border-left-color: rgba(255, 107, 90, 0.7);
}

.page-about .about-duty__name {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0 0 0.35rem;
  font-size: 1rem;
  font-weight: 800;
  line-height: 1.5;
}

.page-about .about-duty__dot {
  flex: none;
  width: 9px;
  height: 9px;
  border-radius: 50%;
}

.page-about .about-duty:nth-child(1) .about-duty__dot {
  background: var(--gold);
}

.page-about .about-duty:nth-child(2) .about-duty__dot {
  background: var(--cyan);
}

.page-about .about-duty:nth-child(3) .about-duty__dot {
  background: var(--coral);
}

.page-about .about-duty p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.78;
}

@media (hover: hover) {
  .page-about .about-duty:nth-child(1):hover {
    background: rgba(227, 180, 92, 0.09);
  }
  .page-about .about-duty:nth-child(2):hover {
    background: rgba(79, 224, 200, 0.08);
  }
  .page-about .about-duty:nth-child(3):hover {
    background: rgba(255, 107, 90, 0.08);
  }
}

/* ---------- 更新节拍 ---------- */
.page-about .about-cadence {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 680px) {
  .page-about .about-cadence {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(1.5rem, 4vw, 2.5rem);
  }
}

.page-about .about-cadence__item {
  padding: 1rem 0;
  border-top: 1px solid var(--line);
  min-width: 0;
}

.page-about .about-cadence__k {
  display: block;
  margin-bottom: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--gold-soft);
}

.page-about .about-cadence__v {
  display: block;
  font-size: 0.92rem;
  line-height: 1.78;
  color: rgba(247, 251, 249, 0.8);
}

.page-about .about-inline-note {
  margin-top: clamp(1.1rem, 2.6vw, 1.5rem);
  font-size: 0.94rem;
}

/* ---------- 判断标准 ---------- */
.page-about .about-criteria {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(0.9rem, 2.4vw, 1.4rem);
}

@media (min-width: 840px) {
  .page-about .about-criteria {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-criteria__item:first-child {
    grid-column: 1 / -1;
  }
}

.page-about .about-criteria__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.9rem;
  align-items: start;
  min-width: 0;
}

.page-about .about-criteria__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.3rem;
  height: 2.3rem;
  border-radius: var(--pill);
  border: 1px solid rgba(227, 180, 92, 0.5);
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.page-about .about-criteria__title {
  margin: 0 0 0.3rem;
  font-size: 1.02rem;
  font-weight: 800;
  line-height: 1.5;
}

.page-about .about-criteria__item p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.78;
}

/* ---------- 出口 ---------- */
.page-about .about-nextline {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: clamp(1.5rem, 3.5vw, 2rem);
}

.page-about .about-nextline .btn {
  border-bottom: 0;
  text-decoration: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node__body {
    animation: none;
  }
  .page-about .about-timeline__item::before,
  .page-about .about-node__summary::after,
  .page-about .about-duty,
  .page-about .about-chapter a {
    transition: none;
  }
}
<<<END>>>

.page-about {
  --step: transparent;
}