.page-about {
  --about-hair: rgba(166, 174, 205, .16);
  --about-cyan-soft: rgba(34, 242, 210, .16);
  --about-orange-soft: rgba(255, 122, 47, .16);
}

/* ---------- 通用标题 ---------- */
.page-about .about-h2 {
  margin: 0 0 var(--gap-s);
  font-size: clamp(24px, 4.2vw, 38px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--bone);
}

.page-about .about-h2::after {
  content: "";
  display: block;
  width: 56px;
  height: 3px;
  margin-top: 14px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
}

/* ---------- 首屏 ---------- */
.page-about .about-lead {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 5vw, 56px) 0 clamp(28px, 5vw, 56px);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-lead::after {
  content: "";
  position: absolute;
  top: -160px;
  right: -140px;
  width: 460px;
  height: 460px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--about-cyan-soft), transparent 68%);
  pointer-events: none;
}

.page-about .about-lead > * {
  position: relative;
  z-index: 1;
}

.page-about .about-lead__kicker {
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-lead__title {
  margin: 0 0 var(--gap-m);
  font-size: clamp(32px, 7vw, 62px);
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--bone);
  max-width: 18ch;
}

.page-about .about-lead__lede {
  margin: 0 0 clamp(24px, 4vw, 40px);
  max-width: 66ch;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-lead__strip {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .about-lead__cell {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 18px 20px;
  background: var(--ink-800);
}

.page-about .about-lead__num {
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: -0.03em;
  white-space: nowrap;
}

.page-about .about-lead__label {
  font-size: 14px;
  color: var(--mist);
}

/* ---------- 起点叙事 ---------- */
.page-about .about-origin__body {
  max-width: 70ch;
}

.page-about .about-origin__body p {
  margin: 0 0 1em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--bone);
}

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

/* ---------- 时间轴 ---------- */
.page-about .about-timeline__intro {
  margin: 0 0 var(--gap-m);
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-timeline__figure {
  margin: 0 0 var(--gap-l);
  border: 1px solid var(--about-hair);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--ink-800);
}

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

.page-about .about-timeline__list {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--gap-m);
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--blue) 48%, var(--orange) 100%);
  opacity: .55;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 20px 20px 20px 24px;
  margin-left: 44px;
  border: 1px solid var(--about-hair);
  border-radius: var(--r-lg);
  background: var(--ink-800);
  transition: border-color .2s ease, transform .2s ease;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -44px;
  top: 26px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 14px var(--about-cyan-soft);
}

.page-about .about-timeline__item:nth-child(even)::before {
  border-color: var(--orange);
  box-shadow: 0 0 14px var(--about-orange-soft);
}

.page-about .about-timeline__item:hover,
.page-about .about-timeline__item:focus-within {
  border-color: var(--line-strong);
  transform: translateY(-4px);
}

.page-about .about-timeline__year {
  display: block;
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--cyan);
  margin-bottom: 6px;
}

.page-about .about-timeline__item:nth-child(even) .about-timeline__year {
  color: var(--orange);
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--bone);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 数据来源与校验 ---------- */
.page-about .about-data__intro {
  margin: 0 0 var(--gap-m);
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-data__figure {
  margin: 0 0 var(--gap-l);
  border: 1px solid var(--about-hair);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--ink-800);
}

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

.page-about .about-data__cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap-m);
}

.page-about .about-data__col {
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--about-hair);
  border-radius: var(--r-lg);
  background: var(--ink-800);
}

.page-about .about-data__col-title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--bone);
}

.page-about .about-data__dot {
  width: 10px;
  height: 10px;
  flex: 0 0 10px;
  border-radius: 50%;
}

.page-about .about-data__dot--cyan {
  background: var(--cyan);
  box-shadow: 0 0 10px var(--cyan);
  animation: about-pulse 2s ease-in-out infinite;
}

.page-about .about-data__dot--orange {
  background: var(--orange);
  box-shadow: 0 0 10px var(--orange);
  animation: about-pulse 2s ease-in-out infinite .6s;
}

@keyframes about-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: .55; transform: scale(.82); }
}

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

.page-about .about-data__dl dt {
  margin: 0 0 4px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--bone);
}

.page-about .about-data__dl dt::before {
  content: "▸ ";
  color: var(--cyan);
}

.page-about .about-data__col:nth-child(2) .about-data__dl dt::before {
  color: var(--orange);
}

.page-about .about-data__dl dd {
  margin: 0 0 16px;
  padding-left: 16px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--mist);
  border-left: 1px solid var(--about-hair);
}

.page-about .about-data__dl dd:last-child {
  margin-bottom: 0;
}

/* ---------- 团队 ---------- */
.page-about .about-team__figure {
  margin: 0 0 var(--gap-l);
  border: 1px solid var(--about-hair);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--ink-800);
}

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

.page-about .about-team__cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap-l);
}

.page-about .about-team__body p {
  margin: 0 0 1em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--bone);
}

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

.page-about .about-team__roles {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .about-team__role {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: var(--ink-800);
}

.page-about .about-team__role-key {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--violet);
}

.page-about .about-team__role-val {
  font-size: 14px;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 规模数字 ---------- */
.page-about .about-scale__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .about-scale__cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(16px, 3vw, 26px);
  background: var(--ink-800);
  min-width: 0;
}

.page-about .about-scale__num {
  font-size: clamp(24px, 4.6vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--cyan);
}

.page-about .about-scale__cell:nth-child(3n+2) .about-scale__num {
  color: var(--orange);
}

.page-about .about-scale__cell:nth-child(3n) .about-scale__num {
  color: var(--green);
}

.page-about .about-scale__label {
  font-size: 15px;
  font-weight: 600;
  color: var(--bone);
}

.page-about .about-scale__sub {
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
  overflow-wrap: anywhere;
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap-s);
}

.page-about .about-eco__item {
  position: relative;
  padding: 20px 22px;
  border: 1px solid var(--about-hair);
  border-left: 3px solid var(--blue);
  border-radius: var(--r-md);
  background: var(--ink-800);
}

.page-about .about-eco__item:nth-child(2) {
  border-left-color: var(--green);
}

.page-about .about-eco__item:nth-child(3) {
  border-left-color: var(--violet);
}

.page-about .about-eco__item:nth-child(4) {
  border-left-color: var(--orange);
}

.page-about .about-eco__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--bone);
}

.page-about .about-eco__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 下一步 ---------- */
.page-about .about-next__panel {
  padding: clamp(22px, 4vw, 40px);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-lg);
  background:
    radial-gradient(120% 140% at 100% 0%, var(--about-orange-soft), transparent 58%),
    var(--ink-800);
}

.page-about .about-next__title::after {
  background: linear-gradient(90deg, var(--orange), var(--cyan));
}

.page-about .about-next__list {
  margin: 0 0 var(--gap-m);
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .about-next__list li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--bone);
}

.page-about .about-next__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--cyan);
}

.page-about .about-next__list li:nth-child(2)::before {
  background: var(--orange);
}

.page-about .about-next__list li:nth-child(3)::before {
  background: var(--violet);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 18px;
}

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

.page-about .about-next__meta a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
}

.page-about .about-next__meta a:hover,
.page-about .about-next__meta a:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-lead__strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-lead__cell {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

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

@media (min-width: 760px) {
  .page-about .about-scale__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-team__cols {
    grid-template-columns: 1.4fr 1fr;
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .about-lead__title {
    max-width: 22ch;
  }

  .page-about .about-timeline__list::before {
    left: 50%;
    transform: translateX(-1px);
  }

  .page-about .about-timeline__item {
    width: calc(50% - 40px);
    margin-left: 0;
    padding: 24px 26px;
  }

  .page-about .about-timeline__item::before {
    top: 30px;
  }

  .page-about .about-timeline__item:nth-child(odd) {
    margin-right: auto;
    text-align: right;
  }

  .page-about .about-timeline__item:nth-child(odd)::before {
    left: auto;
    right: -48px;
  }

  .page-about .about-timeline__item:nth-child(even) {
    margin-left: auto;
  }

  .page-about .about-timeline__item:nth-child(even)::before {
    left: -48px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-data__dot--cyan,
  .page-about .about-data__dot--orange {
    animation: none;
  }

  .page-about .about-timeline__item {
    transition: none;
  }

  .page-about .about-timeline__item:hover,
  .page-about .about-timeline__item:focus-within {
    transform: none;
  }
}