.page-about {
  --about-rail-w: 240px;
  background: var(--c-ink);
  color: var(--c-paper);
  font-family: var(--font-cn);
  font-size: 16px;
  line-height: 1.75;
  padding-bottom: 64px;
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 28px 0 44px;
  border-bottom: 1px solid var(--line-14);
  background:
    linear-gradient(135deg, rgba(61, 245, 138, 0.09) 0%, rgba(11, 27, 43, 0) 46%),
    linear-gradient(315deg, rgba(255, 91, 46, 0.10) 0%, rgba(11, 27, 43, 0) 42%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -60px;
  right: -14%;
  width: 46%;
  height: 190%;
  background: linear-gradient(160deg, rgba(57, 198, 230, 0.14), rgba(11, 27, 43, 0) 72%);
  transform: rotate(11deg);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

.page-about .about-hero__lead h1 {
  margin: 10px 0 16px;
  font-family: var(--font-narrow);
  font-size: 30px;
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--c-paper);
}

.page-about .about-hero__lead .lede {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--paper-72);
}

.page-about .about-hero__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line-14);
  border: 1px solid var(--line-14);
  border-radius: var(--r-sm);
  overflow: hidden;
  align-self: start;
}

.page-about .about-fact {
  background: var(--c-ink-2);
  padding: 14px 14px 12px;
}

.page-about .about-fact dt {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--paper-52);
  font-family: var(--font-mono);
}

.page-about .about-fact dd {
  margin: 4px 0 0;
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--c-lime);
}

.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  padding-top: 28px;
}

.page-about .about-rail {
  border: 1px solid var(--line-14);
  border-radius: var(--r-sm);
  background: var(--c-ink-2);
  padding: 14px 16px 16px;
}

.page-about .about-rail__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-cyan);
  text-transform: uppercase;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px 12px;
}

.page-about .about-rail__list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 0 7px 12px;
  border-left: 2px solid var(--line-20);
  font-size: 14px;
  color: var(--paper-72);
  text-decoration: none;
  transition: color 160ms var(--ease), border-color 160ms var(--ease), padding-left 160ms var(--ease);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--c-lime);
  border-left-color: var(--c-lime);
  padding-left: 16px;
  outline: none;
}

.page-about .about-rail__no {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-cyan);
  flex: none;
}

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

.page-about .about-stage {
  padding: 34px 0;
  border-top: 1px solid var(--line-08);
  scroll-margin-top: calc(var(--h-header) + var(--h-strip) + 18px);
}

.page-about .about-stage:first-child {
  border-top: none;
  padding-top: 8px;
}

.page-about .about-stage h2 {
  margin: 8px 0 16px;
  font-family: var(--font-narrow);
  font-size: 24px;
  font-weight: 800;
  line-height: 1.34;
  letter-spacing: -0.01em;
  color: var(--c-paper);
}

.page-about .about-stage h3 {
  margin: 0 0 8px;
  font-family: var(--font-narrow);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--c-paper);
}

.page-about .about-stage .prose {
  max-width: 68ch;
}

.page-about .about-stage .prose p {
  margin: 0 0 14px;
  color: var(--paper-72);
}

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

.page-about .about-stage__intro {
  margin: 0 0 20px;
  max-width: 66ch;
  color: var(--paper-72);
}

.page-about .about-stage a {
  color: var(--c-cyan);
}

.page-about .about-figure {
  margin: 22px 0 0;
  position: relative;
}

.page-about .about-note {
  margin: 16px 0 0;
  padding: 12px 14px;
  border-left: 2px solid var(--c-lime);
  background: rgba(61, 245, 138, 0.05);
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper-72);
}

/* 团队卡片 */
.page-about .about-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-member {
  position: relative;
  padding: 18px 16px 16px;
  background: var(--c-ink-2);
  border: 1px solid var(--line-14);
  border-radius: var(--r-sm);
  overflow: hidden;
}

.page-about .about-member::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  border-style: solid;
  border-width: 0 0 16px 16px;
  border-color: transparent transparent var(--c-ink) transparent;
}

.page-about .about-member__tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: var(--r-sm);
  background: var(--c-sand);
  color: var(--c-ink);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.page-about .about-member h3 {
  margin: 12px 0 2px;
}

.page-about .about-member__num {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--c-lime);
}

.page-about .about-member p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper-52);
}

/* 项目标签 */
.page-about .about-sports {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 0;
  padding: 0;
}

.page-about .about-sports li {
  padding: 5px 12px;
  border: 1px solid var(--line-20);
  border-radius: var(--r-sm);
  font-size: 13px;
  color: var(--paper-72);
  background: rgba(20, 42, 62, 0.6);
}

/* 编辑流程 */
.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  counter-reset: flow;
}

.page-about .about-flow__item {
  position: relative;
  padding: 16px 16px 16px 18px;
  border-left: 2px solid var(--line-20);
  background: linear-gradient(90deg, rgba(20, 42, 62, 0.85), rgba(20, 42, 62, 0.25));
}

.page-about .about-flow__item:hover {
  border-left-color: var(--c-cyan);
}

.page-about .about-flow__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-cyan);
  margin-bottom: 6px;
}

.page-about .about-flow__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper-52);
}

/* 版本时间轴 */
.page-about .about-timeline {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 4px;
}

.page-about .about-lane {
  position: relative;
  padding-top: 16px;
  border-top: 2px solid var(--line-20);
}

.page-about .about-lane::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 0;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--c-cyan);
}

.page-about .about-lane--current {
  border-top-color: var(--c-lime);
}

.page-about .about-lane--current::before {
  background: var(--c-lime);
  box-shadow: 0 0 0 5px rgba(61, 245, 138, 0.16);
  animation: about-pulse 2s infinite;
}

@keyframes about-pulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(61, 245, 138, 0.18); }
  50% { box-shadow: 0 0 0 8px rgba(61, 245, 138, 0.04); }
}

.page-about .about-lane__ver {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--c-lime);
}

.page-about .about-lane h3 {
  font-size: 16px;
}

.page-about .about-lane__list {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
}

.page-about .about-lane__list li {
  position: relative;
  padding-left: 14px;
  margin-bottom: 6px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--paper-52);
}

.page-about .about-lane__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 5px;
  height: 1px;
  background: var(--c-cyan);
}

/* 生态与数据 */
.page-about .about-quote {
  margin: 22px 0 0;
  padding: 18px 18px 16px;
  border: 1px solid var(--line-14);
  border-left: 3px solid var(--c-orange);
  border-radius: var(--r-sm);
  background: var(--c-ink-2);
}

.page-about .about-quote__text {
  margin: 0 0 10px;
  font-size: 16px;
  line-height: 1.72;
  color: var(--c-paper);
}

.page-about .about-quote__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--paper-52);
}

.page-about .about-usage {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 18px;
  background: var(--line-14);
  border: 1px solid var(--line-14);
  border-radius: var(--r-sm);
  overflow: hidden;
}

.page-about .about-usage__item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 16px 14px;
  background: var(--c-ink-2);
}

.page-about .about-usage__num {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  line-height: 1.15;
  color: var(--c-lime);
}

.page-about .about-usage__label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--paper-52);
}

/* 分布 */
.page-about .about-dist {
  margin-top: 20px;
  display: grid;
  gap: 12px;
}

.page-about .about-dist__row {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr) 48px;
  align-items: center;
  gap: 12px;
}

.page-about .about-dist__label {
  font-size: 13px;
  color: var(--paper-72);
}

.page-about .about-dist__bar {
  display: block;
  height: 8px;
  border-radius: 999px;
  background: var(--line-14);
  overflow: hidden;
}

.page-about .about-dist__fill {
  display: block;
  height: 100%;
  border-radius: 999px;
}

.page-about .about-dist__fill--lime {
  background: linear-gradient(90deg, var(--c-lime), rgba(61, 245, 138, 0.45));
}

.page-about .about-dist__fill--cyan {
  background: linear-gradient(90deg, var(--c-cyan), rgba(57, 198, 230, 0.45));
}

.page-about .about-dist__val {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  text-align: right;
  color: var(--c-paper);
}

.page-about .about-chip-row {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 0;
  padding: 0;
}

.page-about .about-chip {
  padding: 5px 12px;
  border: 1px dashed var(--line-34);
  border-radius: var(--r-sm);
  font-size: 13px;
  color: var(--paper-72);
}

.page-about .about-info {
  margin-top: 22px;
  padding: 18px 16px 16px;
  border: 1px solid var(--line-14);
  border-radius: var(--r-sm);
  background: var(--c-ink-2);
}

.page-about .about-info__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin: 0;
}

.page-about .about-info__list dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--c-cyan);
}

.page-about .about-info__list dd {
  margin: 2px 0 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--c-paper);
  word-break: break-word;
}

.page-about .about-next {
  margin-top: 26px;
  padding: 20px 18px;
  border: 1px solid var(--line-20);
  border-radius: var(--r-sm);
  background: linear-gradient(120deg, rgba(57, 198, 230, 0.10), rgba(255, 91, 46, 0.10));
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .about-next__text {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.6;
  color: var(--c-paper);
}

.page-about .about-next__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .media {
  border-radius: var(--r-sm);
  overflow: hidden;
}

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

@media (min-width: 600px) {
  .page-about .about-hero {
    padding: 40px 0 56px;
  }

  .page-about .about-hero__lead h1 {
    font-size: 38px;
  }

  .page-about .about-stage h2 {
    font-size: 28px;
  }

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

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

  .page-about .about-timeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .about-info__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px 24px;
  }

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

  .page-about .about-next {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

@media (min-width: 1024px) {
  .page-about {
    padding-bottom: 88px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.85fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-hero__lead h1 {
    font-size: 44px;
  }

  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 48px;
    padding-top: 40px;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--h-header) + var(--h-strip) + 24px);
    align-self: start;
  }

  .page-about .about-rail__list {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
  }

  .page-about .about-stage {
    padding: 44px 0;
  }

  .page-about .about-stage h2 {
    font-size: 30px;
  }

  .page-about .about-team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-lane--current::before {
    animation: none;
  }

  .page-about .about-rail__list a {
    transition: none;
  }
}