.page-about {
  --about-accent: var(--gold);
  --about-panel: var(--space);
  max-width: var(--maxw);
  margin-inline: auto;
  padding: clamp(16px, 3vw, 28px) clamp(16px, 4vw, 32px) clamp(56px, 8vw, 96px);
  color: var(--pale);
  font-family: var(--font-body);
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  margin: 0 0 clamp(16px, 3vw, 26px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  padding-bottom: clamp(28px, 4vw, 44px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 6px;
  background: repeating-linear-gradient(100deg, var(--violet) 0 3px, transparent 3px 12px);
  opacity: .9;
}

.page-about .about-hero__title {
  margin: 10px 0 18px;
  font-size: clamp(30px, 6vw, 54px);
  line-height: 1.14;
  font-weight: 800;
  letter-spacing: .02em;
  color: var(--pale);
}

.page-about .about-hero__lead {
  margin: 0 0 24px;
  max-width: 48ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--pale);
  opacity: .86;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 2px;
  background: var(--violet);
  border: 2px solid var(--violet);
  box-shadow: var(--shadow-hard);
}

.page-about .about-stat {
  background: var(--gobi);
  padding: 14px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.2vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: .01em;
  color: var(--gold);
}

.page-about .about-stat__unit {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.5;
  letter-spacing: .04em;
  color: var(--cyan);
}

/* ---------- 主体栅格 ---------- */
.page-about .about-body {
  margin-top: clamp(32px, 5vw, 56px);
}

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

.page-about .about-body__side {
  display: none;
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  position: relative;
  padding: clamp(32px, 4.5vw, 52px) 0;
}

.page-about .about-section + .about-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: repeating-linear-gradient(100deg, var(--line) 0 2px, transparent 2px 10px);
  opacity: .6;
}

.page-about .about-section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  margin-bottom: clamp(16px, 2.5vw, 26px);
  padding-bottom: 10px;
  border-bottom: 2px solid var(--violet);
}

.page-about .about-section__idx {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--gold);
}

.page-about .about-section__title {
  margin: 0;
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: .02em;
  color: var(--pale);
}

.page-about .about-prose p {
  margin: 0 0 16px;
  max-width: 62ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--pale);
  opacity: .88;
}

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

.page-about .about-prose a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.page-about .about-prose a:hover {
  color: var(--gold);
}

/* ---------- 数据条 ---------- */
.page-about .about-metrics {
  list-style: none;
  margin: 0 0 clamp(20px, 3vw, 28px);
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  background: var(--line);
  border: 2px solid var(--line);
}

.page-about .about-metrics__item {
  background: var(--gobi);
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: transform .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-metrics__item:hover {
  transform: translateY(-4px);
  background: var(--violet);
}

.page-about .about-metrics__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-metrics__label {
  font-size: 13px;
  line-height: 1.55;
  color: var(--pale);
  opacity: .82;
}

/* ---------- 六年时间带 ---------- */
.page-about .about-timeline {
  position: relative;
  overflow: hidden;
  border: 2px solid var(--violet);
  background: var(--space);
  box-shadow: var(--shadow-hard);
}

.page-about .about-timeline__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .22;
  pointer-events: none;
}

.page-about .about-timeline::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--space) 6%, rgba(16, 27, 51, .35) 46%, var(--gobi) 100%);
  pointer-events: none;
}

.page-about .about-timeline__track {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: clamp(24px, 4vw, 40px) clamp(16px, 3vw, 28px);
  display: flex;
  gap: clamp(18px, 3vw, 34px);
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-timeline__track::-webkit-scrollbar {
  height: 8px;
}

.page-about .about-timeline__track::-webkit-scrollbar-thumb {
  background: var(--violet);
}

.page-about .about-timeline__track::-webkit-scrollbar-track {
  background: var(--gobi);
}

.page-about .about-timeline__node {
  position: relative;
  flex: 0 0 auto;
  width: min(76vw, 268px);
  padding-top: 34px;
  border-top: 2px solid var(--line);
  scroll-snap-align: start;
}

.page-about .about-timeline__dot {
  position: absolute;
  top: -9px;
  left: 0;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 5px var(--space);
}

.page-about .about-timeline__ver {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-about .about-timeline__name {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--pale);
}

.page-about .about-timeline__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--pale);
  opacity: .78;
}

.page-about .about-timeline__hint {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--poplar);
}

/* ---------- 流程配图 ---------- */
.page-about .about-figure {
  margin: 0 0 clamp(20px, 3vw, 28px);
  border: 2px solid var(--line);
  background: var(--teal);
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-figure__cap {
  padding: 12px 16px;
  border-top: 2px solid var(--line);
  background: var(--teal);
  font-size: 13px;
  line-height: 1.7;
  color: var(--pale);
  opacity: .84;
}

/* ---------- 处理步骤 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
  background: var(--line);
  border: 2px solid var(--line);
}

.page-about .about-flow__step {
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  background: var(--gobi);
}

.page-about .about-flow__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--gold);
}

.page-about .about-flow__name {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--pale);
}

.page-about .about-flow__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--pale);
  opacity: .82;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-team__media {
  border: 2px solid var(--violet);
  background: var(--teal);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.page-about .about-roles {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
  background: var(--line);
  border: 2px solid var(--line);
}

.page-about .about-roles__item {
  display: grid;
  gap: 4px;
  padding: 14px 16px;
  background: var(--space);
}

.page-about .about-roles__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .about-roles__val {
  font-size: 14px;
  line-height: 1.7;
  color: var(--pale);
  opacity: .84;
}

/* ---------- 长期价值 ---------- */
.page-about .about-reasons {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
  background: var(--line);
  border: 2px solid var(--line);
}

.page-about .about-reasons__item {
  position: relative;
  padding: 20px 20px 20px 26px;
  background: var(--gobi);
  display: grid;
  gap: 8px;
}

.page-about .about-reasons__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--violet);
}

.page-about .about-reasons__idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--poplar);
}

.page-about .about-reasons__title {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--pale);
}

.page-about .about-reasons__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--pale);
  opacity: .8;
}

/* ---------- 继续了解 ---------- */
.page-about .about-next {
  display: grid;
  gap: 2px;
  background: var(--line);
  border: 2px solid var(--line);
}

.page-about .about-next__link {
  display: grid;
  gap: 8px;
  padding: 22px 20px;
  background: var(--space);
  color: var(--pale);
  text-decoration: none;
  transition: transform .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  transform: translateY(-4px);
  background: var(--violet);
}

.page-about .about-next__tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-about .about-next__title {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--gold);
}

.page-about .about-next__text {
  font-size: 14px;
  line-height: 1.75;
  color: var(--pale);
  opacity: .78;
}

/* ---------- 章节摘要 ---------- */
.page-about .about-toc {
  border-top: 2px solid var(--violet);
  padding-top: 14px;
}

.page-about .about-toc .toc__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
}

.page-about .about-toc .toc__link {
  display: block;
  padding: 8px 10px;
  border-left: 2px solid var(--line);
  font-size: 13px;
  line-height: 1.45;
  color: var(--pale);
  opacity: .6;
  text-decoration: none;
  transition: opacity .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease);
}

.page-about .about-toc .toc__link:hover,
.page-about .about-toc .toc__link:focus-visible,
.page-about .about-toc .toc__link[aria-current="true"] {
  opacity: 1;
  color: var(--gold);
  border-left-color: var(--gold);
}

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

  .page-about .about-flow__step {
    grid-template-columns: 52px 156px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }

  .page-about .about-reasons {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-next {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-roles__item {
    grid-template-columns: 132px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }
}

@media (min-width: 860px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, .95fr);
    align-items: end;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 224px;
    gap: 48px;
    align-items: start;
  }

  .page-about .about-body__side {
    display: block;
    position: sticky;
    top: calc(var(--topbar-h) + 24px);
  }
}

@media (max-width: 480px) {
  .page-about .about-hero__stats {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-metrics__item,
  .page-about .about-next__link,
  .page-about .about-toc .toc__link {
    transition-duration: .01ms;
  }

  .page-about .about-metrics__item:hover,
  .page-about .about-next__link:hover,
  .page-about .about-next__link:focus-visible {
    transform: none;
  }
}