.page-about {
  --about-radius: 3px;
  --about-radius-lg: 5px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 28px 0 56px;
}

.page-about .about-hero__in {
  display: grid;
  gap: 36px;
}

.page-about .about-hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--amber);
  margin: 0 0 18px;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 34px;
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--paper);
  margin: 0 0 20px;
}

.page-about .about-hero__lead {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.85;
  color: var(--ice);
  max-width: 46ch;
  margin: 0 0 28px;
}

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

.page-about .about-hero__visual {
  position: relative;
  border: 1px solid var(--line);
  background: linear-gradient(158deg, var(--ink-800), var(--ink-950));
  padding: 16px;
  border-radius: var(--about-radius-lg);
  overflow: hidden;
}

.page-about .about-hero__visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(104deg, transparent 32%, rgba(217, 228, 240, 0.13) 47%, transparent 63%);
  pointer-events: none;
}

.page-about .about-rack {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  aspect-ratio: 4 / 3;
}

.page-about .about-rack__cell {
  border: 1px solid var(--line);
  background: rgba(143, 166, 194, 0.06);
  border-radius: var(--about-radius);
  min-height: 48px;
}

.page-about .about-rack__cell--amber {
  border-color: var(--amber-deep);
  background: linear-gradient(160deg, rgba(242, 169, 59, 0.34), rgba(242, 169, 59, 0.05));
}

.page-about .about-rack__cell--celadon {
  border-color: var(--celadon-deep);
  background: linear-gradient(160deg, rgba(79, 168, 139, 0.3), rgba(79, 168, 139, 0.04));
}

.page-about .about-rack__cap {
  position: relative;
  z-index: 1;
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding: 56px 0;
  border-top: 1px solid var(--line-faint);
}

.page-about .about-section .section-head {
  margin-bottom: 36px;
}

.page-about .about-section .section-head__title {
  font-family: var(--font-display);
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-section .section-head__desc {
  font-family: var(--font-body);
  color: var(--mist);
  line-height: 1.8;
}

/* ---------- 四步流程 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-faint);
  border: 1px solid var(--line-faint);
  border-radius: var(--about-radius-lg);
  overflow: hidden;
}

.page-about .about-flow__step {
  background: linear-gradient(180deg, var(--ink-900), var(--ink-950));
  padding: 22px 20px 24px;
}

.page-about .about-flow__num {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--celadon);
}

.page-about .about-flow__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-flow__text {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  color: var(--ice);
}

/* ---------- 发展脉络 ---------- */
.page-about .about-story__grid {
  display: grid;
  gap: 34px;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  border-left: 1px solid var(--line);
}

.page-about .about-node {
  position: relative;
  padding: 0 0 34px;
}

.page-about .about-node:last-child {
  padding-bottom: 0;
}

.page-about .about-node__mark {
  position: absolute;
  left: -31px;
  top: 8px;
  width: 9px;
  height: 9px;
  background: var(--ink-900);
  border: 1px solid var(--amber);
  border-radius: 50%;
}

.page-about .about-node__year {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .about-node__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .about-node__text {
  margin: 0 0 12px;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  color: var(--ice);
  max-width: 58ch;
}

.page-about .about-node__trigger.panel__trigger {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--celadon);
  background: none;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  padding: 7px 12px;
  cursor: pointer;
}

.page-about .about-node__trigger.panel__trigger:hover {
  border-color: var(--celadon);
  color: var(--paper);
}

.page-about .about-node .panel__body {
  margin-top: 14px;
  padding: 16px 18px;
  background: var(--ink-800);
  border-left: 2px solid var(--celadon);
  border-radius: 0 var(--about-radius) var(--about-radius) 0;
}

.page-about .about-node .panel__body p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.85;
  color: var(--ice);
}

.page-about .about-story__figure {
  margin: 0;
}

.page-about .about-story__figure .figure__caption {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
  margin-top: 12px;
}

/* ---------- 团队 ---------- */
.page-about .about-team__figure {
  margin: 0 0 30px;
}

.page-about .about-team__figure .figure__caption {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
  margin-top: 12px;
}

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

.page-about .about-team__card {
  background: linear-gradient(180deg, var(--ink-800), var(--ink-900));
  border: 1px solid var(--line);
  border-top: 3px solid var(--line);
  border-radius: var(--about-radius-lg);
  padding: 22px 20px;
}

.page-about .about-team__card--editor {
  border-top-color: var(--amber);
}

.page-about .about-team__card--tech {
  border-top-color: var(--celadon);
}

.page-about .about-team__card--cs {
  border-top-color: var(--mist);
}

.page-about .about-team__count {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  color: var(--paper);
  letter-spacing: 0.02em;
}

.page-about .about-team__role {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--amber);
}

.page-about .about-team__duty {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  color: var(--ice);
}

.page-about .about-team__extra {
  overflow: hidden;
  max-height: 420px;
  transition: max-height 0.28s ease, opacity 0.28s ease;
  opacity: 1;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--line-faint);
}

.page-about .about-team__extra-title {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .about-team__list {
  margin: 0;
  padding-left: 18px;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ice);
}

/* ---------- 服务网络 ---------- */
.page-about .about-network__figure {
  margin: 0 0 30px;
}

.page-about .about-network__figure .figure__caption {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
  margin-top: 12px;
}

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

.page-about .about-network__item {
  border: 1px solid var(--line);
  border-radius: var(--about-radius-lg);
  padding: 22px 20px;
  background: var(--ink-900);
}

.page-about .about-network__item:nth-child(2) {
  background: linear-gradient(165deg, var(--ink-800), var(--ink-900));
}

.page-about .about-network__tag {
  display: inline-block;
  margin: 0 0 14px;
}

.page-about .about-network__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-network__text {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  color: var(--ice);
}

/* ---------- 资料库体系 ---------- */
.page-about .about-library__grid {
  display: grid;
  gap: 14px;
}

.page-about .about-library__stat {
  background: var(--ice);
  color: var(--ink-900);
  border-radius: var(--about-radius-lg);
  padding: 20px 18px;
}

.page-about .about-library__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  color: var(--ink-800);
}

.page-about .about-library__label {
  margin: 8px 0 10px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink-800);
}

.page-about .about-library__hint {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-700);
}

.page-about .about-library__note {
  margin: 24px 0 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  color: var(--ice);
  border-left: 2px solid var(--amber);
  padding-left: 16px;
}

.page-about .about-library__note a {
  color: var(--amber);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 协作生态 ---------- */
.page-about .about-eco__grid {
  display: grid;
  gap: 34px;
  align-items: center;
}

.page-about .about-orbit {
  position: relative;
  width: 210px;
  height: 210px;
  margin: 0 auto;
  border: 1px dashed var(--line);
  border-radius: 50%;
  flex-shrink: 0;
}

.page-about .about-orbit__core {
  position: absolute;
  inset: 33%;
  border-radius: 50%;
  background: radial-gradient(circle at 38% 32%, var(--ink-700), var(--ink-950));
  border: 1px solid var(--amber-deep);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.06em;
  color: var(--paper);
}

.page-about .about-orbit__dot {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
}

.page-about .about-orbit__dot::before {
  content: "";
  position: absolute;
  width: 9px;
  height: 9px;
  margin: -4.5px 0 0 -4.5px;
  border-radius: 50%;
  background: var(--mist);
}

.page-about .about-orbit__dot:nth-child(2)::before {
  transform: rotate(0deg) translateY(-103px);
}

.page-about .about-orbit__dot:nth-child(3)::before {
  transform: rotate(45deg) translateY(-103px);
}

.page-about .about-orbit__dot:nth-child(4)::before {
  transform: rotate(90deg) translateY(-103px);
}

.page-about .about-orbit__dot:nth-child(5)::before {
  transform: rotate(135deg) translateY(-103px);
}

.page-about .about-orbit__dot:nth-child(6)::before {
  transform: rotate(180deg) translateY(-103px);
  background: var(--celadon);
}

.page-about .about-orbit__dot:nth-child(7)::before {
  transform: rotate(225deg) translateY(-103px);
}

.page-about .about-orbit__dot:nth-child(8)::before {
  transform: rotate(270deg) translateY(-103px);
}

.page-about .about-orbit__dot:nth-child(9)::before {
  transform: rotate(315deg) translateY(-103px);
  background: var(--celadon);
}

.page-about .about-orbit__dot--amber::before {
  background: var(--amber) !important;
}

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

.page-about .about-eco__item {
  border-left: 2px solid var(--line);
  padding: 4px 0 4px 16px;
}

.page-about .about-eco__mark {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--celadon);
}

.page-about .about-eco__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-eco__text {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  color: var(--ice);
}

/* ---------- 长期使用 ---------- */
.page-about .about-loyal__list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line-faint);
}

.page-about .about-loyal__item {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 4px 14px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line-faint);
}

.page-about .about-loyal__idx {
  grid-row: span 2;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--amber);
  line-height: 1.2;
}

.page-about .about-loyal__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-loyal__text {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  color: var(--ice);
  max-width: 62ch;
}

.page-about .about-loyal__cta {
  margin-top: 36px;
  padding: 26px 22px;
  border: 1px solid var(--line);
  border-radius: var(--about-radius-lg);
  background: linear-gradient(135deg, var(--ink-800), var(--ink-950));
}

.page-about .about-loyal__cta-text {
  margin: 0 0 18px;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.8;
  color: var(--ice);
  max-width: 54ch;
}

.page-about .about-loyal__cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 图片自适应 ---------- */
.page-about .figure__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 桌面 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding: 44px 0 72px;
  }

  .page-about .about-hero h1 {
    font-size: 46px;
  }

  .page-about .about-section {
    padding: 72px 0;
  }

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

  .page-about .about-team__grid {
    grid-template-columns: repeat(3, 1fr);
    align-items: start;
  }

  .page-about .about-team__card--editor {
    padding-top: 30px;
  }

  .page-about .about-team__card--tech {
    padding-top: 24px;
  }

  .page-about .about-team__card--cs {
    padding-top: 34px;
  }

  .page-about .about-network__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-library__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-library__stat--wide {
    grid-column: span 3;
    display: grid;
    grid-template-columns: auto 1fr;
    align-items: baseline;
    gap: 0 18px;
  }

  .page-about .about-library__stat--wide .about-library__num {
    grid-row: span 2;
    font-size: 52px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__in {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: center;
    gap: 56px;
  }

  .page-about .about-hero h1 {
    font-size: 52px;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-story__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(240px, 0.9fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-story__figure {
    position: sticky;
    top: 96px;
  }

  .page-about .about-eco__grid {
    grid-template-columns: 260px minmax(0, 1fr);
    gap: 52px;
  }

  .page-about .about-orbit {
    width: 240px;
    height: 240px;
  }

  .page-about .about-orbit__dot:nth-child(2)::before {
    transform: rotate(0deg) translateY(-118px);
  }

  .page-about .about-orbit__dot:nth-child(3)::before {
    transform: rotate(45deg) translateY(-118px);
  }

  .page-about .about-orbit__dot:nth-child(4)::before {
    transform: rotate(90deg) translateY(-118px);
  }

  .page-about .about-orbit__dot:nth-child(5)::before {
    transform: rotate(135deg) translateY(-118px);
  }

  .page-about .about-orbit__dot:nth-child(6)::before {
    transform: rotate(180deg) translateY(-118px);
    background: var(--celadon);
  }

  .page-about .about-orbit__dot:nth-child(7)::before {
    transform: rotate(225deg) translateY(-118px);
  }

  .page-about .about-orbit__dot:nth-child(8)::before {
    transform: rotate(270deg) translateY(-118px);
  }

  .page-about .about-orbit__dot:nth-child(9)::before {
    transform: rotate(315deg) translateY(-118px);
    background: var(--celadon);
  }

  .page-about .about-loyal__cta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 28px;
    padding: 30px 32px;
  }

  .page-about .about-loyal__cta-text {
    margin: 0;
  }

  .page-about .about-team__extra {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
    padding-top: 0;
    border-top-color: transparent;
  }

  .page-about .about-team__card:hover .about-team__extra,
  .page-about .about-team__card:focus-within .about-team__extra {
    max-height: 420px;
    opacity: 1;
    margin-top: 16px;
    padding-top: 14px;
    border-top-color: var(--line-faint);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__extra {
    transition: none;
  }
}