.page-about {
  --about-axis: 178px;
  --about-radius: 16px;
  --about-gap: clamp(26px, 5vw, 60px);
  color: var(--bone);
  padding-bottom: clamp(48px, 8vw, 112px);
}

.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(14px, 3vw, 30px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 48px);
  align-items: end;
  margin: clamp(22px, 4vw, 44px) 0 clamp(24px, 4vw, 44px);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.3rem, 7.4vw, 5rem);
  line-height: 0.98;
  letter-spacing: -0.022em;
  margin: 14px 0 0;
  color: var(--bone);
}

.page-about .about-hero__lede {
  max-width: 42ch;
  margin: clamp(16px, 2.6vw, 24px) 0 0;
  font-size: clamp(0.95rem, 1.9vw, 1.05rem);
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-hero__board {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 200px;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background:
    radial-gradient(circle at 50% 118%, rgba(59, 240, 200, 0.2), transparent 64%),
    var(--glass);
  overflow: hidden;
}

.page-about .about-hero__net {
  width: 68%;
  aspect-ratio: 4 / 3;
  border: 1px solid var(--line-bright);
  border-radius: 4px;
  background:
    repeating-linear-gradient(90deg, rgba(59, 240, 200, 0.18) 0 1px, transparent 1px 17px),
    repeating-linear-gradient(0deg, rgba(59, 240, 200, 0.18) 0 1px, transparent 1px 17px);
}

.page-about .about-hero__figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  overflow: hidden;
}

/* ---------- 双栏画布 ---------- */
.page-about .about-canvas {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 5vw, 52px);
  margin-top: clamp(34px, 6vw, 72px);
  padding-top: clamp(28px, 5vw, 56px);
  border-top: 1px solid var(--line);
}

.page-about .about-axis {
  min-width: 0;
  border-bottom: 1px solid var(--line);
  padding-bottom: 14px;
}

.page-about .about-axis .index-axis__list {
  display: flex;
  flex-wrap: nowrap;
  gap: 20px;
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-axis .index-link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  white-space: nowrap;
  font-size: 0.86rem;
}

.page-about .about-axis .index-link .mono {
  color: var(--mint);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
}

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

/* ---------- 章节通用 ---------- */
.page-about .about-section + .about-section {
  margin-top: clamp(46px, 8vw, 92px);
  padding-top: clamp(30px, 5vw, 54px);
  border-top: 1px solid var(--line);
}

.page-about .about-section__index {
  margin: 0;
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mint);
}

.page-about .about-section .section-title {
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 3.8vw, 2.45rem);
  line-height: 1.1;
  letter-spacing: -0.012em;
  margin: 10px 0 0;
  max-width: 24ch;
  color: var(--bone);
}

.page-about .about-section__lede {
  max-width: 38ch;
  margin: 14px 0 0;
  font-size: 0.95rem;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-inline-link {
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid var(--line-bright);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--bone);
  border-bottom-color: var(--bone);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  position: relative;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0 0 0 clamp(22px, 3.6vw, 36px);
  list-style: none;
  border-left: 1px solid var(--line-bright);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: clamp(16px, 2.6vw, 26px);
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  top: 9px;
  left: calc(-1 * clamp(22px, 3.6vw, 36px) - 4.5px);
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 0 4px rgba(59, 240, 200, 0.14);
}

.page-about .timeline__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  cursor: pointer;
  padding: 2px 0;
  list-style: none;
}

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

.page-about .timeline__year {
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  color: var(--mint);
}

.page-about .timeline__label {
  font-family: var(--font-display);
  font-size: clamp(1.02rem, 2.4vw, 1.3rem);
  font-weight: 700;
  color: var(--bone);
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .timeline__summary:hover .timeline__label {
  color: var(--mint);
  border-bottom-color: var(--line-bright);
}

.page-about .timeline__node[open] .timeline__label {
  color: var(--mint);
}

.page-about .timeline__body {
  margin: 10px 0 0;
  max-width: 38ch;
  font-size: 0.93rem;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 编辑体系 ---------- */
.page-about .about-edit {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 40px);
  margin-top: clamp(24px, 4vw, 38px);
}

.page-about .about-edit__figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  overflow: hidden;
}

.page-about .steps {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .steps__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 12px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .steps__num {
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--mint);
  padding-top: 4px;
}

.page-about .steps__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--bone);
}

.page-about .steps__desc {
  margin: 6px 0 0;
  max-width: 34ch;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 44px);
  align-items: center;
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .about-team__chart {
  width: 100%;
  max-width: 290px;
  margin: 0 auto;
}

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

.page-about .ring {
  fill: none;
  stroke-width: 14;
  transition: stroke-width 0.2s var(--ease), opacity 0.2s var(--ease);
  opacity: 0.92;
}

.page-about .ring--data { stroke: var(--mint); }
.page-about .ring--eng { stroke: var(--mist); }
.page-about .ring--ops { stroke: var(--gray); }

.page-about .ring:hover {
  stroke-width: 19;
  opacity: 1;
}

.page-about .about-team__legend {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-team__item {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-team__num {
  font-size: clamp(1.5rem, 4vw, 2rem);
  line-height: 1;
  letter-spacing: -0.02em;
}

.page-about .about-team__item--data .about-team__num { color: var(--mint); }
.page-about .about-team__item--eng .about-team__num { color: var(--mist); }
.page-about .about-team__item--ops .about-team__num { color: var(--gray); }

.page-about .about-team__label {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--bone);
}

.page-about .about-team__desc {
  margin: 5px 0 0;
  max-width: 34ch;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 覆盖范围条带 ---------- */
.page-about .reach-band {
  list-style: none;
  margin: clamp(24px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .reach-band__card {
  padding: clamp(18px, 3vw, 24px);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: var(--glass);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .reach-band__card:hover {
  border-color: var(--line-bright);
  background: var(--glass-strong);
}

.page-about .reach-band__num {
  display: block;
  font-size: clamp(2rem, 5.4vw, 2.9rem);
  line-height: 1;
  letter-spacing: -0.025em;
  color: var(--mint);
}

.page-about .reach-band__card-title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--bone);
}

.page-about .reach-band__card-desc {
  margin: 7px 0 0;
  font-size: 0.87rem;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 协作生态 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 40px);
  align-items: start;
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .partner-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .partner-list__item {
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .partner-list__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--bone);
}

.page-about .partner-list__desc {
  margin: 6px 0 0;
  max-width: 36ch;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-partners__note {
  margin: 16px 0 0;
  max-width: 36ch;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-partners__figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  overflow: hidden;
}

/* ---------- 版本演进 ---------- */
.page-about .milestones {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .milestone {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: clamp(16px, 3vw, 24px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .milestone__tag {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mint);
}

.page-about .milestone__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.02rem, 2.2vw, 1.22rem);
  font-weight: 700;
  color: var(--bone);
}

.page-about .milestone__desc {
  margin: 7px 0 0;
  max-width: 40ch;
  font-size: 0.9rem;
  line-height: 1.74;
  color: var(--mist);
}

/* ---------- 收束 ---------- */
.page-about .about-close {
  margin-top: clamp(46px, 8vw, 92px);
  padding-top: clamp(30px, 5vw, 54px);
  border-top: 1px solid var(--line);
}

.page-about .about-close__stats {
  list-style: none;
  margin: 0 0 clamp(26px, 4vw, 44px);
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .about-close__stat {
  padding-top: 14px;
  border-top: 1px solid var(--line-bright);
}

.page-about .about-close__num {
  display: block;
  font-size: clamp(2.4rem, 7vw, 3.8rem);
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--bone);
}

.page-about .about-close__cap {
  margin: 10px 0 0;
  font-size: 0.86rem;
  line-height: 1.6;
  color: var(--gray);
}

.page-about .about-close__cta {
  display: grid;
  gap: 16px;
  padding: clamp(22px, 4vw, 40px);
  border: 1px solid var(--line-bright);
  border-radius: var(--about-radius);
  background:
    radial-gradient(120% 150% at 100% 0%, rgba(59, 240, 200, 0.13), transparent 60%),
    var(--glass);
}

.page-about .about-close__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4.2vw, 2.3rem);
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--bone);
}

.page-about .about-close__text {
  margin: 0;
  max-width: 38ch;
  font-size: 0.94rem;
  line-height: 1.76;
  color: var(--mist);
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 4px;
}

/* ---------- 断点 ---------- */
@media (min-width: 700px) {
  .page-about .reach-band {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
  .page-about .about-close__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }
}

@media (min-width: 820px) {
  .page-about .about-edit {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    align-items: start;
  }
  .page-about .about-team {
    grid-template-columns: minmax(0, 0.78fr) minmax(0, 1.22fr);
  }
  .page-about .milestone {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

@media (min-width: 880px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.6fr);
  }
  .page-about .about-partners {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }
}

@media (min-width: 960px) {
  .page-about .about-canvas {
    grid-template-columns: var(--about-axis) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 60px);
    align-items: start;
  }
  .page-about .about-axis {
    border-bottom: 0;
    padding-bottom: 0;
  }
  .page-about .about-axis .index-axis__sticky {
    position: sticky;
    top: clamp(24px, 9vh, 84px);
  }
  .page-about .about-axis .index-axis__list {
    display: block;
    overflow: visible;
  }
  .page-about .about-axis .index-axis__list li + li {
    margin-top: 11px;
  }
}

@media (min-width: 1040px) {
  .page-about .reach-band {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    align-items: start;
  }
  .page-about .reach-band__card:nth-child(2) {
    margin-top: 28px;
  }
  .page-about .reach-band__card:nth-child(3) {
    margin-top: 12px;
  }
  .page-about .reach-band__card:nth-child(4) {
    margin-top: 40px;
  }
}