.page-about {
  --about-cut: 16px;
  --about-aurora: linear-gradient(145deg, #0B2338 0%, #1B6EC2 58%, #23C9B6 100%);
  --about-line-soft: rgba(169, 200, 232, 0.42);
}

/* ---------- 首屏 masthead ---------- */
.page-about .about-masthead {
  position: relative;
  overflow: hidden;
  background: var(--cn-night);
  color: var(--cn-ice);
  padding: clamp(28px, 5vw, 56px) 0 clamp(36px, 6vw, 72px);
}

.page-about .about-masthead::before {
  content: "";
  position: absolute;
  top: -34%;
  right: -22%;
  width: min(720px, 92vw);
  aspect-ratio: 1 / 1;
  background:
    radial-gradient(circle at 34% 34%, rgba(35, 201, 182, 0.34), transparent 60%),
    radial-gradient(circle at 68% 64%, rgba(27, 110, 194, 0.55), transparent 62%);
  pointer-events: none;
}

.page-about .about-masthead::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(115deg, rgba(169, 200, 232, 0.09) 0 1px, transparent 1px 68px);
  pointer-events: none;
}

.page-about .about-masthead__inner {
  position: relative;
  z-index: 1;
}

.page-about .cn-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--cn-frost);
  margin-bottom: clamp(20px, 4vw, 40px);
}

.page-about .cn-breadcrumb a {
  color: var(--cn-frost);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .cn-breadcrumb a:hover,
.page-about .cn-breadcrumb a:focus-visible {
  color: #fff;
  border-bottom-color: var(--cn-red);
}

.page-about .cn-breadcrumb__sep {
  color: rgba(169, 200, 232, 0.5);
}

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

.page-about .about-rail-vertical {
  margin: 0;
  font-family: var(--cn-font-mono);
  font-size: 12px;
  letter-spacing: 0.26em;
  color: var(--cn-cyan);
}

.page-about .about-masthead__title {
  font-family: var(--cn-font-display);
  font-weight: 900;
  font-size: clamp(2.1rem, 6.4vw, 4.4rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin: 14px 0 18px;
  max-width: 18ch;
  text-wrap: balance;
}

.page-about .about-masthead__lead {
  margin: 0;
  max-width: 640px;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--cn-ice-70);
}

.page-about .about-figures {
  list-style: none;
  margin: clamp(28px, 5vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--cn-line-dark);
  border-top: 1px solid var(--cn-line-dark);
  border-bottom: 1px solid var(--cn-line-dark);
}

.page-about .about-figure {
  background: var(--cn-night);
  padding: 18px 16px 16px;
}

.page-about .about-figure__num {
  display: block;
  font-family: var(--cn-font-mono);
  font-size: clamp(1.7rem, 4.4vw, 2.5rem);
  line-height: 1.1;
  color: var(--cn-gold);
}

.page-about .about-figure__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--cn-frost);
}

/* ---------- 通用章节头 ---------- */
.page-about .about-head {
  max-width: 780px;
}

.page-about .cn-section__title {
  font-family: var(--cn-font-display);
  font-weight: 700;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

.page-about .cn-section__lead {
  line-height: 1.85;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  overflow: hidden;
  background: var(--cn-ice);
}

.page-about .about-timeline__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.page-about .about-timeline__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.14;
}

.page-about .about-timeline__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-timeline__list {
  list-style: none;
  margin: clamp(28px, 5vw, 52px) 0 0;
  padding: 0;
}

.page-about .about-node {
  position: relative;
  display: grid;
  gap: 10px;
  padding: 0 0 34px 28px;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 11px;
  height: 11px;
  background: var(--cn-red);
  transform: rotate(45deg);
  box-shadow: 0 0 0 4px rgba(215, 38, 61, 0.14);
}

.page-about .about-node::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 26px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--cn-blue), rgba(35, 201, 182, 0.12));
}

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

.page-about .about-node:last-child::after {
  display: none;
}

.page-about .about-node__phase {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cn-mist);
}

.page-about .about-node__body {
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--cn-line);
  border-left: 3px solid var(--cn-blue);
  padding: 16px 18px;
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, var(--about-cut) 100%, 0 calc(100% - var(--about-cut)));
  transition: border-color 0.24s ease, background-color 0.24s ease;
}

.page-about .about-node__body:hover {
  border-color: var(--cn-blue);
  background: #fff;
}

.page-about .about-node__title {
  margin: 0 0 8px;
  font-family: var(--cn-font-display);
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--cn-night);
}

.page-about .about-node__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--cn-mist);
}

/* ---------- 站点做什么 ---------- */
.page-about .about-duty {
  background: var(--cn-ink);
  color: var(--cn-ice);
}

.page-about .about-duty__inner {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .about-duty .cn-section__title {
  color: var(--cn-ice);
  margin: 12px 0 20px;
  max-width: 22ch;
}

.page-about .about-duty__main p {
  margin: 0 0 16px;
  max-width: 620px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--cn-ice-70);
}

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

.page-about .about-duty__index {
  border: 1px solid var(--cn-line-dark);
  border-top: 3px solid var(--cn-red);
  padding: 22px 20px;
  background: rgba(11, 35, 56, 0.72);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 22px 100%, 0 calc(100% - 22px));
}

.page-about .about-duty__index-title {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cn-cyan);
}

.page-about .about-index-list {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
}

.page-about .about-index-list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--cn-line-dark);
}

.page-about .about-index-list li:last-child {
  border-bottom: none;
}

.page-about .about-index-list a {
  color: var(--cn-ice);
  text-decoration: none;
  font-size: 15px;
  border-bottom: 1px solid transparent;
}

.page-about .about-index-list a:hover,
.page-about .about-index-list a:focus-visible {
  color: var(--cn-gold);
  border-bottom-color: var(--cn-gold);
}

.page-about .about-index-list__current {
  font-size: 15px;
  color: var(--cn-gold);
  font-weight: 700;
}

.page-about .about-index-list .cn-mono {
  font-size: 12px;
  color: var(--cn-frost);
}

.page-about .about-duty__index-note {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--cn-frost);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: var(--cn-ice);
}

.page-about .about-teams {
  display: grid;
  gap: 16px;
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .about-team {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 20px;
  background: #fff;
  border: 1px solid var(--cn-frost);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, var(--about-cut) 100%, 0 calc(100% - var(--about-cut)));
  transition: border-color 0.24s ease, box-shadow 0.24s ease;
}

.page-about .about-team:hover {
  border-color: var(--cn-blue);
  box-shadow: var(--cn-shadow);
}

.page-about .about-teams > .about-team {
  margin-top: 0;
}

.page-about .about-team__no {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cn-red);
}

.page-about .about-team__title {
  margin: 0;
  font-family: var(--cn-font-display);
  font-size: 1.14rem;
  font-weight: 700;
  color: var(--cn-night);
}

.page-about .about-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-team__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--cn-mist);
}

.page-about .about-team__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 2px;
  background: var(--cn-cyan);
}

/* ---------- 栏目分类 ---------- */
.page-about .about-taxonomy {
  position: relative;
  background: #fff;
}

.page-about .about-taxonomy__band {
  height: 6px;
  background: linear-gradient(90deg, var(--cn-red), var(--cn-red-deep) 34%, var(--cn-blue) 72%, var(--cn-cyan));
}

.page-about .about-taxonomy__figure {
  margin: clamp(26px, 4vw, 42px) 0;
}

.page-about .about-folds {
  border-top: 1px solid var(--cn-line);
}

.page-about .about-folds .cn-fold {
  border-bottom: 1px solid var(--cn-line);
}

.page-about .about-folds .cn-fold__trigger {
  width: 100%;
  text-align: left;
  font-family: var(--cn-font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--cn-night);
}

.page-about .about-folds .cn-fold__inner p {
  margin: 0;
  max-width: 760px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--cn-mist);
}

.page-about .about-taxonomy__link {
  margin: clamp(22px, 3vw, 32px) 0 0;
  font-size: 15px;
  color: var(--cn-mist);
}

.page-about .about-taxonomy__link a {
  color: var(--cn-blue);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid rgba(27, 110, 194, 0.3);
}

.page-about .about-taxonomy__link a:hover,
.page-about .about-taxonomy__link a:focus-visible {
  border-bottom-color: var(--cn-red);
  color: var(--cn-red-deep);
}

/* ---------- 访问与区域 ---------- */
.page-about .about-access {
  position: relative;
  overflow: hidden;
  background: var(--about-aurora);
  color: var(--cn-ice);
}

.page-about .about-access::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(245, 249, 253, 0.14) 1px, transparent 1px);
  background-size: 22px 22px;
  opacity: 0.5;
  pointer-events: none;
}

.page-about .about-access__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-about .about-access .cn-section__title {
  color: #fff;
  margin: 12px 0 20px;
  max-width: 20ch;
}

.page-about .about-access__copy p {
  margin: 0 0 16px;
  max-width: 620px;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(245, 249, 253, 0.86);
}

.page-about .about-access__points {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-access__points li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 14px;
  color: rgba(245, 249, 253, 0.86);
}

.page-about .about-access__points .cn-mono {
  min-width: 56px;
  font-size: 1.15rem;
  color: var(--cn-gold);
}

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

.page-about .about-access__figure .cn-media__caption {
  color: rgba(245, 249, 253, 0.72);
}

/* ---------- 协作与认可 ---------- */
.page-about .about-partner {
  background: var(--cn-ice);
}

.page-about .about-band {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin: clamp(24px, 4vw, 40px) 0;
  padding: 14px 18px;
  background: linear-gradient(90deg, rgba(215, 38, 61, 0.1), rgba(27, 110, 194, 0.08) 60%, rgba(35, 201, 182, 0.1));
  border-left: 4px solid var(--cn-red);
}

.page-about .about-band .cn-band__label {
  font-family: var(--cn-font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cn-red-deep);
  white-space: nowrap;
}

.page-about .about-band .cn-band__rule {
  flex: 1 1 40px;
  height: 1px;
  min-width: 24px;
  background: var(--cn-line);
}

.page-about .about-band__note {
  font-size: 13px;
  line-height: 1.7;
  color: var(--cn-mist);
}

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

.page-about .about-partner__panel {
  background: #fff;
  border: 1px solid var(--cn-frost);
  border-top: 3px solid var(--cn-blue);
  padding: 22px 20px;
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
}

.page-about .about-partner__panel .cn-panel__title {
  margin: 0 0 12px;
  font-family: var(--cn-font-display);
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--cn-night);
}

.page-about .about-partner__panel .cn-panel__body {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--cn-mist);
}

/* ---------- 收尾 ---------- */
.page-about .about-next {
  background: var(--cn-ink);
  color: var(--cn-ice);
}

.page-about .about-next__inner {
  max-width: 760px;
}

.page-about .about-next .cn-section__title {
  color: var(--cn-ice);
  margin: 12px 0 18px;
  max-width: 22ch;
}

.page-about .about-next__lead {
  margin: 0 0 28px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--cn-ice-70);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-masthead__grid {
    grid-template-columns: 46px minmax(0, 1fr);
    gap: 26px;
    align-items: start;
  }

  .page-about .about-rail-vertical {
    writing-mode: vertical-rl;
    letter-spacing: 0.34em;
    padding-top: 6px;
  }

  .page-about .about-node {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 26px;
    padding-left: 56px;
    align-items: start;
  }

  .page-about .about-node__phase {
    writing-mode: vertical-rl;
    justify-self: center;
    letter-spacing: 0.3em;
    padding-top: 2px;
  }

  .page-about .about-node::before {
    left: 18px;
    top: 10px;
  }

  .page-about .about-node::after {
    left: 23px;
    top: 28px;
  }

  .page-about .about-duty__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .about-access__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: center;
  }

  .page-about .about-partner__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1060px) {
  .page-about .about-teams {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

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