.page-about {
  --about-tl-pad: 44px;
  --about-trace-center: 20px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap);
}

.page-about .about-hero__main {
  padding: clamp(22px, 3.4vw, 40px);
  background-image: radial-gradient(120% 100% at 0% 0%, rgba(53, 242, 225, 0.10), transparent 58%),
    radial-gradient(90% 90% at 100% 100%, rgba(123, 91, 255, 0.16), transparent 62%);
}

.page-about .about-hero__title {
  margin: 10px 0 0;
  font-size: clamp(29px, 5.2vw, 52px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  font-weight: 900;
  color: var(--c-glass);
}

.page-about .about-hero__mark {
  color: var(--c-cyan);
  position: relative;
  white-space: nowrap;
}

.page-about .about-hero__mark::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.06em;
  height: 0.22em;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, rgba(53, 242, 225, 0.55), rgba(123, 91, 255, 0.25));
  z-index: -1;
}

.page-about .about-hero__lede {
  margin-top: 18px;
  color: var(--c-mist);
  max-width: 68ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* 关键数字 */
.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  align-content: start;
}

.page-about .about-figure {
  padding: 18px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--c-edge);
  background: linear-gradient(158deg, rgba(123, 91, 255, 0.18), rgba(53, 242, 225, 0.05) 70%, rgba(7, 11, 31, 0.4));
  transition: border-color 0.35s var(--ease), transform 0.35s var(--ease);
}

.page-about .about-figure:hover {
  border-color: var(--c-edge-2);
  transform: translateY(-2px);
}

.page-about .about-figure__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(21px, 3vw, 29px);
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--c-cyan);
}

.page-about .about-figure__label {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-mist);
}

/* ---------- 平台定位 ---------- */
.page-about .about-media-band {
  margin: 0 0 calc(var(--gap) * 1.6);
}

.page-about .about-position__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: calc(var(--gap) * 1.4);
}

.page-about .about-position__title {
  margin: 8px 0 18px;
  font-size: clamp(24px, 3.2vw, 36px);
  line-height: 1.25;
  font-weight: 900;
  color: var(--c-glass);
}

.page-about .about-position__text p {
  margin: 0 0 1.1em;
  max-width: 66ch;
  line-height: 1.78;
  color: var(--c-mist);
}

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

.page-about .about-position__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-position__list li {
  position: relative;
  padding: 14px 16px 14px 42px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--c-edge);
  background: rgba(232, 241, 255, 0.04);
  color: var(--c-glass);
  font-size: 15px;
  line-height: 1.65;
}

.page-about .about-position__list li::before {
  content: "";
  position: absolute;
  left: 17px;
  top: 21px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-violet);
  box-shadow: 0 0 12px rgba(123, 91, 255, 0.7);
}

/* ---------- 成长节点 · 纵向时间轴 ---------- */
.page-about .about-growth__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: calc(var(--gap) * 1.5);
}

.page-about .about-timeline {
  position: relative;
}

.page-about .about-timeline__trace {
  position: absolute;
  left: 6px;
  top: 8px;
  width: 28px;
  height: calc(100% - 40px);
  overflow: visible;
  pointer-events: none;
}

.page-about .about-timeline__trace polyline {
  fill: none;
  stroke: url(#aboutTraceGrad);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-dasharray: 7 11;
  vector-effect: non-scaling-stroke;
  animation: about-trace-flow 26s linear infinite;
}

@keyframes about-trace-flow {
  from { stroke-dashoffset: 0; }
  to { stroke-dashoffset: -340; }
}

.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 var(--about-tl-pad);
  display: grid;
  gap: 16px;
}

.page-about .about-node {
  position: relative;
  padding: 20px 20px 20px 22px;
  border-radius: var(--radius);
  border: 1px solid var(--c-edge);
  background: linear-gradient(158deg, rgba(16, 26, 61, 0.78), rgba(7, 11, 31, 0.55));
  transition: border-color 0.35s var(--ease), transform 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  top: 26px;
  left: calc(var(--about-trace-center) - var(--about-tl-pad) - 6px);
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--c-cyan);
  box-shadow: 0 0 0 4px rgba(53, 242, 225, 0.14), 0 0 16px rgba(53, 242, 225, 0.55);
}

.page-about .about-node:hover,
.page-about .about-node:focus-within {
  border-color: var(--c-edge-2);
  transform: translateY(-2px);
  box-shadow: var(--shadow-1);
}

.page-about .about-node__ver {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-violet);
}

.page-about .about-node__title {
  margin: 8px 0 8px;
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.35;
  font-weight: 800;
  color: var(--c-glass);
}

.page-about .about-node__text {
  margin: 0;
  color: var(--c-mist);
  line-height: 1.75;
}

.page-about .about-node__more {
  margin: 0;
  color: var(--c-cyan);
  font-size: 14px;
  line-height: 1.7;
}

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

/* ---------- 团队分工 ---------- */
.page-about .about-crew__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap);
}

.page-about .about-crew__card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 22px;
}

.page-about .about-crew__card .tag {
  align-self: flex-start;
}

.page-about .about-crew__list {
  list-style: none;
  margin: 4px 0 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--c-edge);
  display: grid;
  gap: 8px;
}

.page-about .about-crew__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--c-mist);
}

.page-about .about-crew__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 1px;
  background: var(--c-cyan);
  transform: rotate(45deg);
}

.page-about .about-crew__media {
  margin: 0;
  min-height: 220px;
  border-radius: var(--radius);
  border: 1px solid var(--c-edge);
  overflow: hidden;
  background: linear-gradient(150deg, rgba(16, 26, 61, 0.9), rgba(7, 11, 31, 0.6));
}

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

/* ---------- 质量基线 ---------- */
.page-about .about-baseline__wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: calc(var(--gap) * 1.3);
}

.page-about .about-baseline__head .section__desc a {
  color: var(--c-cyan);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.page-about .about-baseline__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-baseline__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 15px 18px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  border-left: 2px solid var(--c-violet);
  background: linear-gradient(90deg, rgba(123, 91, 255, 0.12), rgba(232, 241, 255, 0.02));
}

.page-about .about-baseline__key {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--c-cyan);
  letter-spacing: 0.02em;
}

.page-about .about-baseline__val {
  color: var(--c-mist);
  font-size: 15px;
  line-height: 1.7;
}

/* ---------- 合作与认可 ---------- */
.page-about .about-eco__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: calc(var(--gap) * 1.3);
  align-items: start;
}

.page-about .about-eco__text p {
  margin: 0 0 1.1em;
  max-width: 66ch;
  line-height: 1.78;
  color: var(--c-mist);
}

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

.page-about .about-eco__panel {
  padding: 24px;
}

.page-about .about-eco__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-eco__list li {
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  font-size: 15px;
  line-height: 1.68;
  color: var(--c-glass);
}

.page-about .about-eco__list .dot {
  margin-top: 8px;
}

/* ---------- 行动区 ---------- */
.page-about .about-cta__inner {
  padding: clamp(24px, 3.6vw, 44px);
  border-radius: var(--radius);
  border: 1px solid var(--c-edge);
  background-image: radial-gradient(110% 130% at 100% 0%, rgba(255, 138, 61, 0.16), transparent 55%),
    radial-gradient(100% 120% at 0% 100%, rgba(53, 242, 225, 0.14), transparent 60%),
    linear-gradient(150deg, rgba(16, 26, 61, 0.85), rgba(7, 11, 31, 0.7));
}

.page-about .about-cta__title {
  margin: 0;
  font-size: clamp(23px, 3.2vw, 34px);
  line-height: 1.28;
  font-weight: 900;
  color: var(--c-glass);
}

.page-about .about-cta__text {
  margin: 14px 0 0;
  max-width: 60ch;
  color: var(--c-mist);
  line-height: 1.78;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-position__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-baseline__item {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }

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

  .page-about .about-crew__media {
    grid-column: span 2;
    min-height: 280px;
  }
}

@media (min-width: 980px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: stretch;
  }

  .page-about .about-growth__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-growth__media {
    position: sticky;
    top: 104px;
  }

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

  .page-about .about-crew__media {
    grid-column: auto;
    min-height: 100%;
    align-self: stretch;
  }

  .page-about .about-crew__card:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .about-crew__card:nth-child(3) {
    margin-top: 52px;
  }

  .page-about .about-eco__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-baseline__wrap {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }
}

@media (max-width: 520px) {
  .page-about .about-figures {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-node {
    padding: 18px 16px 18px 18px;
  }

  .page-about .about-hero__actions .btn,
  .page-about .about-cta__actions .btn {
    width: 100%;
    justify-content: center;
  }
}

/* 悬停展开阶段详情：仅在真正支持悬停的大屏上收起 */
@media (hover: hover) and (min-width: 980px) {
  .page-about .about-node__more {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0;
    transition: max-height 0.42s var(--ease), opacity 0.32s var(--ease), margin-top 0.42s var(--ease);
  }

  .page-about .about-node:hover .about-node__more,
  .page-about .about-node:focus-within .about-node__more {
    max-height: 200px;
    opacity: 1;
    margin-top: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__trace polyline {
    animation: none;
  }

  .page-about .about-node,
  .page-about .about-figure {
    transition: none;
  }
}