.page-about {
  --about-pad: clamp(56px, 9vw, 116px);
  --about-glow: radial-gradient(60% 70% at 12% 0%, rgba(155, 107, 255, .14), transparent 70%);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(28px, 5vw, 56px);
  padding-bottom: clamp(48px, 8vw, 92px);
  background-image: var(--about-glow);
  background-repeat: no-repeat;
}

.page-about .about-hero h1 {
  margin: 18px 0 0;
  max-width: 22em;
  font-size: clamp(32px, 6vw, 58px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--fog);
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 42em;
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.85;
  color: var(--silver);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(32px, 5vw, 56px);
  background: var(--line-soft);
  border: 1px solid var(--line);
}

@media (min-width: 760px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px clamp(16px, 2vw, 24px);
  background: var(--ink-850);
}

.page-about .about-fact__k {
  font-size: clamp(20px, 2.4vw, 26px);
  letter-spacing: -0.01em;
  color: var(--fog);
}

.page-about .about-fact__k--violet { color: var(--violet); }
.page-about .about-fact__k--cyan { color: var(--cyan); }
.page-about .about-fact__k--gold { color: var(--gold); }

.page-about .about-fact__v {
  font-size: 13px;
  line-height: 1.6;
  color: var(--dust);
}

/* ---------- 通用区块头 ---------- */
.page-about .section h2 {
  margin: 14px 0 0;
  font-size: clamp(24px, 3.4vw, 36px);
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--fog);
}

.page-about .about-intro__grid,
.page-about .about-content__grid {
  display: grid;
  gap: 26px;
}

@media (min-width: 920px) {
  .page-about .about-intro__grid {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
    gap: clamp(40px, 6vw, 88px);
  }
  .page-about .about-content__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: clamp(36px, 5vw, 72px);
    align-items: start;
  }
}

.page-about .about-intro__body p + p,
.page-about .about-content__lead .prose p + p {
  margin-top: 18px;
}

.page-about .about-content__lead .prose a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(36, 224, 214, .35);
}

.page-about .about-content__lead .prose a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline__head {
  display: grid;
  gap: 12px;
  margin-top: 14px;
}

.page-about .about-timeline__note {
  margin: 0;
  max-width: 40em;
  color: var(--silver);
  line-height: 1.8;
}

.page-about .about-timeline__banner {
  margin: clamp(28px, 4vw, 44px) 0 0;
}

.page-about .timeline {
  list-style: none;
  margin: clamp(36px, 5vw, 60px) 0 0;
  padding: 0;
}

.page-about .tl-node {
  position: relative;
  margin-left: 12px;
  padding: 0 0 32px 26px;
  border-left: 1px solid var(--line);
  outline: none;
}

.page-about .tl-node:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
  background-image: linear-gradient(180deg, var(--line), transparent);
  background-size: 1px 100%;
  background-repeat: no-repeat;
  background-position: left top;
}

.page-about .tl-node__dot {
  position: absolute;
  left: -12px;
  top: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  font-size: 11px;
  border-radius: 50%;
  border: 1px solid var(--violet);
  color: var(--violet);
  background: var(--ink-900);
  box-shadow: 0 0 0 6px rgba(155, 107, 255, .08);
  transition: box-shadow .32s var(--ease), border-color .32s var(--ease), color .32s var(--ease);
}

.page-about .tl-node__phase {
  margin: 4px 0 0;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--gold);
}

.page-about .tl-node__title {
  margin: 8px 0 0;
  font-size: clamp(18px, 2vw, 21px);
  line-height: 1.5;
  color: var(--fog);
}

.page-about .tl-node__desc {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--silver);
}

.page-about .tl-node:hover .tl-node__dot,
.page-about .tl-node:focus .tl-node__dot,
.page-about .tl-node:focus-within .tl-node__dot {
  color: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 8px rgba(36, 224, 214, .1);
}

@media (min-width: 900px) {
  .page-about .timeline {
    position: relative;
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0 clamp(14px, 2vw, 28px);
  }

  .page-about .timeline::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 11px;
    height: 1px;
    background: linear-gradient(90deg, var(--violet), var(--cyan) 58%, var(--gold));
    opacity: .5;
  }

  .page-about .tl-node,
  .page-about .tl-node:last-child {
    margin-left: 0;
    padding: 0 clamp(14px, 1.6vw, 24px) 0 0;
    border-left: 0;
    background-image: none;
  }

  .page-about .tl-node__dot {
    position: static;
    margin-bottom: 18px;
  }

  .page-about .tl-node__phase {
    margin-top: 0;
  }

  .page-about .tl-node__desc {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height .32s var(--ease), opacity .32s var(--ease), margin-top .32s var(--ease);
  }

  .page-about .tl-node:hover .tl-node__desc,
  .page-about .tl-node:focus .tl-node__desc,
  .page-about .tl-node:focus-within .tl-node__desc {
    max-height: 240px;
    margin-top: 10px;
    opacity: 1;
  }
}

/* ---------- 团队 ---------- */
.page-about .about-team__head {
  display: grid;
  gap: 12px;
  margin-top: 14px;
}

.page-about .about-team__note {
  margin: 0;
  max-width: 42em;
  color: var(--silver);
  line-height: 1.8;
}

.page-about .about-team__media {
  margin: clamp(28px, 4vw, 44px) 0 0;
}

.page-about .about-team__panels {
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .team-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(22px, 3vw, 30px);
  background: linear-gradient(180deg, var(--ink-850), var(--ink-800));
  border: 1px solid var(--line);
  border-top: 2px solid var(--violet);
}

.page-about .team-panel:nth-child(2) { border-top-color: var(--cyan); }
.page-about .team-panel:nth-child(3) { border-top-color: var(--gold); }

.page-about .team-panel__no {
  margin: 0;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--silver);
}

.page-about .team-panel h3 {
  margin: 0;
  font-size: 19px;
  line-height: 1.5;
  color: var(--fog);
}

.page-about .team-panel > p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--silver);
}

.page-about .team-panel details {
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
}

.page-about .team-panel summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--violet);
}

.page-about .team-panel summary::-webkit-details-marker { display: none; }

.page-about .team-panel summary::after {
  content: "＋";
  float: right;
}

.page-about .team-panel details[open] summary::after { content: "－"; }
.page-about .team-panel details[open] summary { color: var(--cyan); }

.page-about .team-panel ul {
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .team-panel li {
  position: relative;
  padding-left: 14px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--dust);
}

.page-about .team-panel li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 5px;
  height: 1px;
  background: var(--cyan);
}

/* ---------- 内容产出 ---------- */
.page-about .about-content__media {
  margin: 0;
}

.page-about .about-content__list {
  list-style: none;
  margin: clamp(36px, 5vw, 56px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
}

@media (min-width: 860px) {
  .page-about .about-content__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-content__item {
  padding: clamp(22px, 3vw, 30px);
  background: var(--ink-850);
}

.page-about .about-content__tag {
  display: inline-block;
  margin-bottom: 12px;
}

.page-about .about-content__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--silver);
}

/* ---------- 规模 ---------- */
.page-about .about-scale h2 {
  max-width: 22em;
}

.page-about .scale-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(28px, 4vw, 44px);
  background: var(--line-soft);
  border: 1px solid var(--line);
}

@media (min-width: 640px) {
  .page-about .scale-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1020px) {
  .page-about .scale-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

.page-about .scale-item {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(24px, 3vw, 38px);
  background: var(--ink-850);
}

.page-about .scale-item__num {
  font-size: clamp(38px, 5.4vw, 62px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--fog);
}

.page-about .scale-item--cyan .scale-item__num { color: var(--cyan); }
.page-about .scale-item--violet .scale-item__num { color: var(--violet); }
.page-about .scale-item--gold .scale-item__num { color: var(--gold); }

.page-about .scale-item__label {
  font-size: 15px;
  color: var(--fog);
}

.page-about .scale-item__hint {
  font-size: 13px;
  line-height: 1.7;
  color: var(--dust);
}

.page-about .about-scale__note {
  margin: clamp(24px, 3vw, 36px) 0 0;
  max-width: 44em;
  font-size: 17px;
  line-height: 1.9;
  color: var(--silver);
}

/* ---------- 合作与投入 ---------- */
.page-about .about-eco__grid {
  display: grid;
  gap: clamp(28px, 4vw, 44px);
  margin-top: 14px;
}

@media (min-width: 920px) {
  .page-about .about-eco__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 72px);
  }
}

.page-about .about-eco__block p {
  margin-top: 16px;
}

.page-about .about-eco__block--accent {
  padding: clamp(24px, 3vw, 34px);
  background: linear-gradient(160deg, rgba(155, 107, 255, .1), rgba(36, 224, 214, .05));
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
}

.page-about .about-eco__block--accent h2 {
  margin-top: 0;
}

.page-about .about-eco__list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-eco__list li {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 10px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--silver);
}

.page-about .about-eco__list .mono {
  font-size: 12px;
  padding-top: .35em;
  color: var(--cyan);
}

/* ---------- 收尾 ---------- */
.page-about .about-next__panel {
  display: grid;
  gap: 16px;
  padding: clamp(28px, 4vw, 48px);
  background: var(--ink-850);
  border: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}

.page-about .about-next__panel::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: linear-gradient(180deg, var(--violet), var(--cyan) 55%, var(--gold));
}

.page-about .about-next__panel h2 {
  margin: 0;
  max-width: 20em;
}

.page-about .about-next__text {
  margin: 0;
  max-width: 42em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

@media (max-width: 719px) {
  .page-about .about-next__actions .btn {
    flex: 1 1 100%;
    text-align: center;
  }
}

/* ---------- 图片框细节 ---------- */
.page-about .media-frame img {
  max-width: 100%;
  height: auto;
  object-fit: cover;
  display: block;
}

.page-about .media-frame__caption {
  font-size: 13px;
  line-height: 1.7;
  color: var(--dust);
}
</final>