.page-about {
  --about-max: 1080px;
  --about-line: var(--nm-line);
  --about-line-soft: var(--nm-line-soft);
  color: var(--nm-snow);
  font-family: var(--font-body);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .about-shell {
  width: 100%;
  max-width: var(--about-max);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 40px);
}

/* 面包屑 */
.page-about .about-crumb {
  padding-top: clamp(16px, 3vw, 28px);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--nm-rock);
}
.page-about .about-crumb a {
  color: var(--nm-frost);
  text-decoration: none;
}
.page-about .about-crumb a:hover {
  color: var(--nm-ice);
}

/* 首屏 */
.page-about .about-hero {
  padding-block: clamp(24px, 5vw, 48px) clamp(8px, 2vw, 16px);
  border-bottom: 1px solid var(--about-line);
}
.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.9rem, 6vw, 3.2rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--nm-snow);
}
.page-about .about-hero__lede {
  margin-top: 18px;
  max-width: 34em;
  color: var(--nm-frost);
  font-size: clamp(0.98rem, 1.6vw, 1.06rem);
  line-height: 1.8;
}

.page-about .about-facts {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line-soft);
  border: 1px solid var(--about-line-soft);
}
.page-about .about-facts__item {
  background: var(--nm-deep);
  padding: 16px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.page-about .about-facts__num {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 4vw, 1.9rem);
  line-height: 1;
  color: var(--nm-ice);
  letter-spacing: 0.02em;
}
.page-about .about-facts__label {
  font-size: 0.8rem;
  color: var(--nm-rock);
  letter-spacing: 0.04em;
}

/* 章节通用 */
.page-about .about-sec {
  margin-top: clamp(44px, 8vw, 84px);
}
.page-about .about-sec h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.3rem, 4vw, 1.75rem);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--nm-snow);
}
.page-about .about-anchor {
  margin-left: 0.4em;
  font-family: var(--font-mono);
  font-size: 0.62em;
  color: var(--nm-ice);
  opacity: 0.45;
  text-decoration: none;
  vertical-align: 0.15em;
}
.page-about .about-anchor:hover,
.page-about .about-anchor:focus-visible {
  opacity: 1;
}
.page-about .about-sec p {
  margin: 14px 0 0;
  color: var(--nm-frost);
  font-size: 0.98rem;
  line-height: 1.85;
  max-width: 38em;
}
.page-about .about-intro {
  color: var(--nm-rock) !important;
}
.page-about .about-text {
  margin-top: 22px !important;
}

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}
.page-about .about-split__side {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .about-figure {
  margin: 0;
}
.page-about .media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-note {
  margin: 0;
  padding-left: 12px;
  border-left: 2px solid var(--nm-ice);
  color: var(--nm-rock);
  font-size: 0.84rem;
  line-height: 1.7;
  max-width: 30em;
}
.page-about .about-note a {
  color: var(--nm-ice);
  text-decoration: none;
  border-bottom: 1px solid var(--about-line);
}
.page-about .about-note--wide {
  margin-top: 20px;
  max-width: 44em;
}

/* 要点列表 */
.page-about .about-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .about-list li {
  position: relative;
  padding-left: 20px;
  color: var(--nm-frost);
  font-size: 0.95rem;
  line-height: 1.8;
  max-width: 40em;
}
.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 7px;
  height: 7px;
  background: var(--nm-ice);
}
.page-about .about-list strong {
  color: var(--nm-snow);
  font-weight: 700;
}

/* 时间线 */
.page-about .tl {
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 0 22px;
  position: relative;
}
.page-about .tl::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: var(--nm-line);
}
.page-about .tl__item {
  position: relative;
  margin-bottom: 12px;
}
.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 18px;
  width: 9px;
  height: 9px;
  background: var(--nm-deep);
  border: 1px solid var(--nm-ice);
}
.page-about .tl__box {
  border: 1px solid var(--about-line);
  background: var(--nm-sea);
  transition: border-color var(--t-fast) var(--ease), box-shadow var(--t-base) var(--ease);
}
.page-about .tl__box:hover {
  border-color: var(--nm-ice);
}
.page-about .tl__box[open] {
  box-shadow: var(--shadow-card);
}
.page-about .tl__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}
.page-about .tl__head::-webkit-details-marker {
  display: none;
}
.page-about .tl__year {
  font-family: var(--font-mono);
  font-size: 0.86rem;
  letter-spacing: 0.06em;
  color: var(--nm-maple);
}
.page-about .tl__box[open] .tl__year {
  color: var(--nm-copper);
}
.page-about .tl__name {
  flex: 1;
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--nm-snow);
  line-height: 1.5;
}
.page-about .tl__hint {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--nm-rock);
  transition: transform var(--t-fast) var(--ease);
}
.page-about .tl__box[open] .tl__hint {
  transform: rotate(45deg);
  color: var(--nm-ice);
}
.page-about .tl__body {
  padding: 0 16px 16px;
  border-top: 1px solid var(--about-line-soft);
}
.page-about .tl__body p {
  margin-top: 12px;
  font-size: 0.92rem;
  color: var(--nm-frost);
  line-height: 1.8;
}

/* 团队 */
.page-about .team {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .team__row {
  background: var(--nm-sea);
  border: 1px solid var(--about-line-soft);
  padding: 16px;
  transition: border-color var(--t-fast) var(--ease), box-shadow var(--t-base) var(--ease),
    transform var(--t-fast) var(--ease);
}
.page-about .team__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}
.page-about .team__label {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--nm-snow);
}
.page-about .team__num {
  font-family: var(--font-mono);
  font-size: 0.86rem;
  letter-spacing: 0.04em;
  color: var(--nm-frost);
}
.page-about .team__bar {
  display: block;
  height: 6px;
  margin: 12px 0 10px;
  background: rgba(244, 248, 250, 0.08);
}
.page-about .team__fill {
  display: block;
  height: 100%;
  width: 0;
}
.page-about .team__row--proof .team__fill {
  width: 34.6%;
  background: var(--nm-ice);
}
.page-about .team__row--version .team__fill {
  width: 23.1%;
  background: var(--nm-copper);
}
.page-about .team__row--support .team__fill {
  width: 19.2%;
  background: var(--nm-maple);
}
.page-about .team__row--tech .team__fill {
  width: 23.1%;
  background: var(--nm-tundra);
}
.page-about .team__duty {
  margin: 0 !important;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--nm-rock);
  max-width: 44em;
}
.page-about .about-figure--team {
  margin-top: 24px;
}

/* 分类体系 */
.page-about .tax {
  margin: 24px 0 0;
  display: grid;
  gap: 10px;
}
.page-about .tax__row {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  background: var(--nm-polar);
  border-left: 2px solid var(--nm-ice);
}
.page-about .tax__row--old {
  border-left-color: var(--nm-rock);
}
.page-about .tax__row--sub {
  border-left-color: var(--nm-copper);
  background: var(--nm-sea);
}
.page-about .tax__num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  line-height: 1;
  color: var(--nm-frost);
}
.page-about .tax__row--old .tax__num {
  color: var(--nm-rock);
}
.page-about .tax__row--sub .tax__num {
  color: var(--nm-copper);
}
.page-about .tax__text {
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--nm-snow);
}

/* 合作生态 */
.page-about .partner-map {
  width: 100%;
  max-width: 340px;
  height: auto;
  color: var(--nm-ice);
  align-self: flex-start;
}
.page-about .partner-map__hub {
  fill: var(--nm-copper);
}

/* 下一步 */
.page-about .steps {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .steps__item {
  padding: 18px 16px;
  border: 1px solid var(--about-line-soft);
  background: var(--nm-sea);
}
.page-about .steps__no {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--nm-copper);
}
.page-about .steps__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--nm-snow);
}
.page-about .steps__text {
  margin: 6px 0 0 !important;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--nm-rock);
}

.page-about .about-actions {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-about .about-actions .btn {
  text-decoration: none;
}

@media (min-width: 720px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .team__row {
    padding: 18px 20px;
  }
  .page-about .tl__head {
    padding: 16px 20px;
  }
  .page-about .tl__body {
    padding: 0 20px 18px;
  }
}

@media (min-width: 940px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 40px;
    align-items: start;
  }
  .page-about .about-split__side {
    padding-top: 6px;
  }
  .page-about .team__row:hover {
    border-color: var(--nm-ice);
    box-shadow: var(--shadow-card);
    transform: translateY(-2px);
  }
  .page-about .steps__item {
    padding: 22px 20px;
  }
  .page-about .tl {
    padding-left: 28px;
  }
  .page-about .tl__item::before {
    left: -28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__hint,
  .page-about .team__row,
  .page-about .tl__box {
    transition: none;
  }
  .page-about .team__row:hover {
    transform: none;
  }
}
</main>