.page-about {
  --about-node: 27px;
  --about-track: 52px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(26px, 5vw, 58px) clamp(34px, 6vw, 72px);
}

.page-about .about-hero .page-title {
  max-width: 22ch;
  letter-spacing: -0.01em;
}

.page-about .about-hero .page-title::after {
  content: "";
  display: block;
  width: clamp(72px, 16vw, 180px);
  height: 2px;
  margin-top: 24px;
  background: linear-gradient(90deg, #6E4BD1 0%, #4FE0C8 100%);
}

.page-about .about-hero .page-lead {
  max-width: 62ch;
  margin-top: 22px;
}

.page-about .about-meta-row {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 28px 0 0;
  padding: 0;
}

/* ---------- 通用段落 ---------- */
.page-about .about-intro {
  max-width: 66ch;
  margin: 0 0 clamp(26px, 4vw, 42px);
  color: rgba(242, 239, 232, 0.76);
  font-size: 17px;
  line-height: 1.78;
}

.page-about .about-figure {
  margin: clamp(30px, 5vw, 54px) 0 0;
}

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

.page-about .about-figure .media-caption {
  margin-top: 12px;
  color: rgba(242, 239, 232, 0.52);
  font-size: 14px;
  line-height: 1.7;
}

.page-about .about-inline-link {
  color: #B9A6F2;
  text-decoration: none;
  border-bottom: 1px solid rgba(185, 166, 242, 0.42);
  transition: color 0.24s cubic-bezier(0.22, 0.61, 0.36, 1),
    border-color 0.24s cubic-bezier(0.22, 0.61, 0.36, 1);
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: #4FE0C8;
  border-color: #4FE0C8;
}

/* ---------- 01 团队构成 ---------- */
.page-about .about-crew-sec {
  position: relative;
}

.page-about .about-crew-sec::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 12% 18%, rgba(110, 75, 209, 0.18), transparent 46%),
    radial-gradient(circle at 88% 76%, rgba(79, 224, 200, 0.08), transparent 42%);
}

.page-about .about-crew-sec > .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-crew {
  display: grid;
  gap: 16px;
}

.page-about .about-crew-card {
  position: relative;
  padding: 26px 24px 26px;
  background: linear-gradient(158deg, #131B3B 0%, #0E1223 100%);
  border: 1px solid rgba(90, 102, 140, 0.34);
  clip-path: polygon(16px 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%, 0 16px);
  transition: border-color 0.3s cubic-bezier(0.22, 0.61, 0.36, 1);
}

.page-about .about-crew-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 62%;
  height: 3px;
  background: linear-gradient(90deg, #6E4BD1, rgba(110, 75, 209, 0));
}

.page-about .about-crew-card:hover {
  border-color: rgba(122, 132, 160, 0.62);
}

.page-about .about-crew-card:nth-child(2)::before {
  background: linear-gradient(90deg, #4FE0C8, rgba(79, 224, 200, 0));
}

.page-about .about-crew-card:nth-child(3)::before {
  background: linear-gradient(90deg, #5C7A5A, rgba(92, 122, 90, 0));
}

.page-about .about-crew-card:nth-child(4)::before {
  background: linear-gradient(90deg, #B4674A, rgba(180, 103, 74, 0));
}

.page-about .about-crew-num {
  display: block;
  color: #E7B44C;
  margin-bottom: 14px;
}

.page-about .about-crew-role {
  margin: 0 0 10px;
  font-size: 21px;
  font-weight: 600;
  line-height: 1.4;
  color: #F2EFE8;
}

.page-about .about-crew-desc {
  margin: 0;
  color: rgba(242, 239, 232, 0.74);
  font-size: 16px;
  line-height: 1.78;
}

.page-about .about-crew-desc b {
  color: #F2EFE8;
  font-weight: 600;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;
}

/* ---------- 02 沿革时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: clamp(26px, 3.6vw, 46px);
  margin-top: clamp(10px, 2vw, 20px);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg,
    rgba(110, 75, 209, 0.9) 0%,
    rgba(79, 224, 200, 0.55) 52%,
    rgba(110, 75, 209, 0.06) 100%);
}

.page-about .about-tl-item {
  position: relative;
  padding-left: var(--about-track);
}

.page-about .about-tl-node {
  position: absolute;
  left: 0;
  top: 2px;
  width: var(--about-node);
  height: var(--about-node);
  display: grid;
  place-items: center;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;
  font-size: 10px;
  letter-spacing: 0;
  color: rgba(242, 239, 232, 0.52);
  background: #131B3B;
  border: 1px solid rgba(122, 132, 160, 0.5);
  clip-path: polygon(9px 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%, 0 9px);
  transition: color 0.24s cubic-bezier(0.22, 0.61, 0.36, 1),
    background 0.24s cubic-bezier(0.22, 0.61, 0.36, 1),
    border-color 0.24s cubic-bezier(0.22, 0.61, 0.36, 1);
}

.page-about .about-tl-node.is-active,
.page-about .about-tl-item.is-active .about-tl-node {
  color: #0B0E1A;
  background: #E7B44C;
  border-color: #E7B44C;
}

.page-about .about-tl-year {
  display: block;
  margin-bottom: 10px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: #E7B44C;
}

.page-about .about-tl-title {
  margin: 0 0 10px;
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 600;
  line-height: 1.35;
  color: #F2EFE8;
}

.page-about .about-tl-text {
  max-width: 64ch;
  margin: 0;
  color: rgba(242, 239, 232, 0.74);
  font-size: 16.5px;
  line-height: 1.8;
}

/* ---------- 03 编目流程 ---------- */
.page-about .about-flow {
  list-style: none;
  display: grid;
  gap: 14px;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  counter-reset: about-flow;
}

.page-about .about-flow-step {
  position: relative;
  padding: 22px 22px 24px;
  background: rgba(22, 32, 74, 0.52);
  border-left: 2px solid #5C7A5A;
  transition: border-color 0.28s cubic-bezier(0.22, 0.61, 0.36, 1),
    background 0.28s cubic-bezier(0.22, 0.61, 0.36, 1);
}

.page-about .about-flow-step:hover {
  background: rgba(26, 36, 80, 0.72);
  border-left-color: #E7B44C;
}

.page-about .about-flow-num {
  display: block;
  margin-bottom: 10px;
  color: #E7B44C;
}

.page-about .about-flow-name {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 600;
  color: #F2EFE8;
}

.page-about .about-flow-step p {
  margin: 0;
  color: rgba(242, 239, 232, 0.72);
  font-size: 15.5px;
  line-height: 1.76;
}

/* ---------- 04 使用场景 ---------- */
.page-about .about-scenes {
  list-style: none;
  margin: clamp(6px, 1.5vw, 14px) 0 0;
  padding: 0;
  border-top: 1px solid rgba(90, 102, 140, 0.34);
}

.page-about .about-scene {
  display: grid;
  gap: 10px;
  padding: 22px 0;
  border-bottom: 1px solid rgba(90, 102, 140, 0.34);
}

.page-about .about-scene-title {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  color: #F2EFE8;
}

.page-about .about-scene-title::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 10px;
  vertical-align: middle;
  background: #B4674A;
  transform: rotate(45deg);
}

.page-about .about-scene-text {
  margin: 0;
  max-width: 68ch;
  color: rgba(242, 239, 232, 0.72);
  font-size: 16px;
  line-height: 1.8;
}

/* ---------- 05 更新节奏 ---------- */
.page-about .about-cadence {
  margin: clamp(20px, 3vw, 34px) 0 0;
  display: grid;
  gap: 0;
  border-top: 1px solid rgba(90, 102, 140, 0.34);
}

.page-about .about-cadence-item {
  display: grid;
  gap: 8px;
  padding: 22px 0 22px 18px;
  border-bottom: 1px solid rgba(90, 102, 140, 0.34);
  border-left: 1px solid rgba(90, 102, 140, 0.34);
}

.page-about .about-cadence dt {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: #4FE0C8;
}

.page-about .about-cadence dd {
  margin: 0;
  max-width: 68ch;
  color: rgba(242, 239, 232, 0.74);
  font-size: 16px;
  line-height: 1.8;
}

.page-about .about-invite {
  max-width: 70ch;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding-left: 18px;
  border-left: 2px solid #6E4BD1;
  color: rgba(242, 239, 232, 0.76);
  font-size: 16.5px;
  line-height: 1.85;
}

/* ---------- 收束 ---------- */
.page-about .about-closing {
  padding-bottom: clamp(40px, 7vw, 96px);
}

.page-about .about-closing .about-figure {
  margin-top: 0;
}

.page-about .about-sign {
  margin: 24px 0 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;
  font-size: 14px;
  letter-spacing: 0.06em;
  color: rgba(242, 239, 232, 0.52);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-crew {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-cadence-item {
    grid-template-columns: 200px minmax(0, 1fr);
    align-items: baseline;
    gap: 26px;
  }
}

@media (min-width: 900px) {
  .page-about .about-scene {
    grid-template-columns: 246px minmax(0, 1fr);
    align-items: baseline;
    gap: 30px;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px 24px;
  }

  .page-about .about-flow-step:nth-child(2),
  .page-about .about-flow-step:nth-child(5) {
    margin-top: 30px;
  }

  .page-about .about-flow-step:nth-child(3),
  .page-about .about-flow-step:nth-child(6) {
    margin-top: 8px;
  }

  .page-about .about-timeline {
    padding-left: 26px;
  }

  .page-about .about-timeline::before {
    left: 39px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-crew {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-crew-card:nth-child(1) {
    grid-column: 1 / span 5;
  }

  .page-about .about-crew-card:nth-child(2) {
    grid-column: 7 / span 6;
  }

  .page-about .about-crew-card:nth-child(3) {
    grid-column: 2 / span 5;
  }

  .page-about .about-crew-card:nth-child(4) {
    grid-column: 8 / span 5;
  }

  .page-about .about-tl-item {
    padding-left: 62px;
  }

  .page-about .about-tl-text,
  .page-about .about-tl-title {
    max-width: 72ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-crew-card,
  .page-about .about-tl-node,
  .page-about .about-flow-step,
  .page-about .about-inline-link {
    transition: none;
  }
}
</main>