.page-about {
  --about-gutter: clamp(20px, 3.4vw, 48px);
  --about-rail-w: 210px;
  --about-tint: rgba(182, 255, 46, 0.14);
  --about-tint-violet: rgba(123, 92, 255, 0.16);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: var(--s2);
}

.page-about .about-hero__frame {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: clamp(430px, 64vh, 650px);
  margin-top: var(--s2);
  border: 1px solid var(--line-700);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-900);
  isolation: isolate;
}

.page-about .about-hero__frame::before,
.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  z-index: 4;
  width: 24px;
  height: 24px;
  border: 2px solid var(--lime);
  pointer-events: none;
}

.page-about .about-hero__frame::before {
  top: 12px;
  left: 12px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .about-hero__frame::after {
  right: 12px;
  bottom: 12px;
  border-top: 0;
  border-left: 0;
}

.page-about .about-hero__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.4;
  filter: saturate(0.55) contrast(1.08) brightness(0.85);
}

.page-about .about-hero__veil {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to top, rgba(5, 7, 14, 0.97) 4%, rgba(5, 7, 14, 0.62) 46%, rgba(5, 7, 14, 0.28) 100%),
    repeating-linear-gradient(to right, rgba(34, 48, 76, 0.5) 0 1px, transparent 1px 48px),
    repeating-linear-gradient(to bottom, rgba(34, 48, 76, 0.36) 0 1px, transparent 1px 48px);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 900px;
  padding: clamp(26px, 4vw, 56px);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 var(--s2);
  color: var(--lime);
}

.page-about .about-hero__title {
  margin: 0 0 var(--s2);
  color: var(--white);
  text-wrap: balance;
}

.page-about .about-hero__lead {
  margin: 0 0 var(--s3);
  max-width: 58ch;
  color: var(--white);
  opacity: 0.82;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s1);
}

.page-about .about-hero__metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line-700);
  border-top: 0;
  border-radius: 0 0 var(--radius) var(--radius);
  background: var(--panel-900);
  overflow: hidden;
}

.page-about .about-hero__metric {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: var(--s2) clamp(14px, 2vw, 26px);
  border-right: 1px solid var(--line-700);
}

.page-about .about-hero__metric:last-child {
  border-right: 0;
}

.page-about .about-hero__mnum {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 40px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--lime);
}

.page-about .about-hero__munit {
  margin-left: 2px;
  font-size: 0.5em;
  color: var(--muted);
}

.page-about .about-hero__mlabel {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---------- 品牌时间线 ---------- */
.page-about .about-tl {
  position: relative;
  margin: var(--s3) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 40px;
  left: 4px;
  width: 1px;
  background: linear-gradient(to bottom, var(--lime), var(--line-700) 22%, var(--line-700) 88%, transparent);
}

.page-about .about-tl__item {
  position: relative;
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: var(--about-gutter);
  padding-bottom: var(--s4);
}

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

.page-about .about-tl__mark {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-left: 20px;
}

.page-about .about-tl__dot {
  position: absolute;
  top: 9px;
  left: 0;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(182, 255, 46, 0.13), 0 0 14px rgba(182, 255, 46, 0.5);
}

.page-about .about-tl__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .about-tl__when {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--white);
}

.page-about .about-tl__body {
  padding-top: 4px;
}

.page-about .about-tl__title {
  margin: 0 0 10px;
  font-size: clamp(19px, 2vw, 24px);
  line-height: 1.32;
  color: var(--white);
}

.page-about .about-tl__text {
  margin: 0;
  max-width: 66ch;
  color: var(--muted);
  line-height: 1.78;
}

/* ---------- 团队构成 ---------- */
.page-about .about-crew__row {
  padding: var(--s2) 0 var(--s3);
  border-top: 1px solid var(--line-700);
}

.page-about .about-crew__row:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-crew__rowhead {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--s1);
  margin-bottom: 12px;
}

.page-about .about-crew__role {
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--white);
}

.page-about .about-crew__num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1;
  color: var(--lime);
}

.page-about .about-crew__track {
  height: 26px;
  border: 1px solid var(--line-700);
  border-radius: var(--radius);
  background: var(--ink-900);
  overflow: hidden;
}

.page-about .about-crew__fill {
  height: 100%;
  background-image: repeating-linear-gradient(to right, var(--lime) 0 6px, transparent 6px 10px);
  background-color: var(--about-tint);
}

.page-about .about-crew__fill--14 {
  width: 70%;
}

.page-about .about-crew__fill--6 {
  width: 30%;
  background-image: repeating-linear-gradient(to right, var(--violet) 0 6px, transparent 6px 10px);
  background-color: var(--about-tint-violet);
}

.page-about .about-crew__desc {
  margin: 12px 0 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-zones {
  margin-top: var(--s3);
  border: 1px solid var(--line-700);
  border-radius: var(--radius);
  background: var(--card-900);
  overflow: hidden;
}

.page-about .about-zones__figure {
  position: relative;
  height: clamp(180px, 26vw, 260px);
  background:
    repeating-linear-gradient(to right, rgba(34, 48, 76, 0.55) 0 1px, transparent 1px 44px),
    repeating-linear-gradient(to bottom, rgba(34, 48, 76, 0.55) 0 1px, transparent 1px 44px),
    var(--ink-900);
}

.page-about .about-zones__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.72;
}

.page-about .about-zones__list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-700);
}

.page-about .about-zones__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: var(--s2) var(--s2);
  border-right: 1px solid var(--line-700);
  transition: background-color 0.25s var(--ease);
}

.page-about .about-zones__item:last-child {
  border-right: 0;
}

.page-about .about-zones__item:hover,
.page-about .about-zones__item:focus-within {
  background: rgba(182, 255, 46, 0.07);
}

.page-about .about-zones__name {
  font-family: var(--font-display);
  font-size: clamp(18px, 2vw, 24px);
  letter-spacing: 0.04em;
  color: var(--white);
}

.page-about .about-zones__count {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--lime);
}

/* ---------- 数据来源 ---------- */
.page-about .about-source__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: var(--s3) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-700);
}

.page-about .about-source__item {
  padding: var(--s3) 0;
  border-bottom: 1px solid var(--line-700);
}

.page-about .about-source__no {
  display: inline-block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-source__title {
  margin: 0 0 10px;
  font-size: clamp(18px, 2vw, 22px);
  color: var(--white);
}

.page-about .about-source__text {
  margin: 0;
  max-width: 68ch;
  color: var(--muted);
  line-height: 1.78;
}

.page-about .about-source__partner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s2);
  margin-top: var(--s3);
  padding: var(--s3);
  border: 1px dashed var(--line-700);
  border-radius: var(--radius);
  background: rgba(19, 28, 47, 0.6);
}

.page-about .about-source__partnerhead {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-source__pnum {
  font-family: var(--font-mono);
  font-size: clamp(32px, 4vw, 48px);
  line-height: 1;
  color: var(--violet);
}

.page-about .about-source__plabel {
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-source__ptext {
  margin: 0;
  max-width: 70ch;
  color: var(--white);
  opacity: 0.78;
  line-height: 1.78;
}

/* ---------- 内容栏目 ---------- */
.page-about .about-columns__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: var(--s3) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-700);
}

.page-about .about-columns__item {
  position: relative;
  padding: var(--s3) 0 var(--s3) 0;
  border-bottom: 1px solid var(--line-700);
  transition: padding-left 0.25s var(--ease);
}

.page-about .about-columns__item::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 2px;
  background: var(--lime);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.3s var(--ease);
}

.page-about .about-columns__item:hover::before {
  transform: scaleY(1);
}

.page-about .about-columns__item:hover {
  padding-left: 16px;
}

.page-about .about-columns__itemtitle {
  margin: 12px 0 8px;
  font-size: clamp(17px, 1.8vw, 20px);
  color: var(--white);
}

.page-about .about-columns__itemtext {
  margin: 0;
  max-width: 64ch;
  color: var(--muted);
  line-height: 1.76;
}

.page-about .about-columns__foot {
  margin: var(--s3) 0 0;
  font-size: 15px;
  color: var(--muted);
}

.page-about .about-columns__foot a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(182, 255, 46, 0.4);
}

.page-about .about-columns__foot a:hover {
  border-bottom-color: var(--lime);
}

/* ---------- 版本演进 ---------- */
.page-about .about-ver__banner {
  position: relative;
  height: clamp(120px, 18vw, 190px);
  margin: var(--s3) 0 var(--s3);
  border: 1px solid var(--line-700);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-900);
}

.page-about .about-ver__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.5;
  filter: saturate(0.7);
}

.page-about .about-ver__track {
  display: flex;
  gap: var(--s2);
  margin: 0;
  padding: 0 0 var(--s2);
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-ver__card {
  flex: 0 0 clamp(232px, 60vw, 312px);
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: var(--s2);
  border: 1px solid var(--line-700);
  border-radius: var(--radius);
  background: var(--card-900);
  box-shadow: var(--shadow);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .about-ver__card:hover {
  border-color: var(--lime);
  transform: translateY(-2px);
}

.page-about .about-ver__v {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.2vw, 36px);
  line-height: 1;
  color: var(--lime);
}

.page-about .about-ver__t {
  margin: 0;
  font-size: 17px;
  color: var(--white);
}

.page-about .about-ver__d {
  margin: 0;
  font-size: 14px;
  line-height: 1.74;
  color: var(--muted);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin-top: var(--s2);
  border-top: 1px solid var(--line-700);
}

.page-about .about-eco__block {
  padding: var(--s3) 0;
  border-bottom: 1px solid var(--line-700);
}

.page-about .about-eco__block--accent {
  padding-left: var(--s2);
  border-left: 2px solid var(--violet);
  background: linear-gradient(90deg, rgba(123, 92, 255, 0.09), transparent 66%);
}

.page-about .about-eco__title {
  margin: 0 0 10px;
  font-size: clamp(17px, 1.8vw, 20px);
  color: var(--white);
}

.page-about .about-eco__text {
  margin: 0;
  max-width: 66ch;
  color: var(--muted);
  line-height: 1.78;
}

.page-about .about-eco__foot {
  margin: var(--s3) 0 0;
  font-size: 15px;
  color: var(--muted);
}

.page-about .about-eco__foot a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(182, 255, 46, 0.4);
}

.page-about .about-eco__foot a:hover {
  border-bottom-color: var(--lime);
}

/* ---------- 联系与合作 ---------- */
.page-about .about-contact__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s3);
  margin-top: var(--s3);
}

.page-about .about-contact__channels {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .about-contact__note {
  margin: var(--s2) 0 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-contact__panel {
  padding: var(--s3);
  border: 1px solid var(--line-700);
  border-radius: var(--radius);
  background: var(--card-900);
  box-shadow: var(--shadow);
}

.page-about .about-contact__ptitle {
  margin: 0 0 var(--s2);
  font-size: 18px;
  color: var(--white);
}

.page-about .about-contact__list {
  margin: 0 0 var(--s3);
  padding: 0;
  list-style: none;
}

.page-about .about-contact__li {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-700);
  font-size: 15px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-contact__li:last-child {
  border-bottom: 0;
}

.page-about .about-contact__liidx {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--lime);
  padding-top: 3px;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-source__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-top: 0;
    gap: var(--s2);
  }

  .page-about .about-source__item {
    padding: var(--s3) var(--s2) var(--s3) 0;
    border-bottom: 0;
    border-top: 1px solid var(--line-700);
  }

  .page-about .about-source__grid .about-source__item:first-child {
    padding-left: 0;
  }

  .page-about .about-source__item + .about-source__item {
    padding-left: var(--s2);
    border-left: 1px solid var(--line-700);
  }

  .page-about .about-source__partner {
    grid-template-columns: 200px 1fr;
    align-items: center;
    gap: var(--s3);
  }

  .page-about .about-columns__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: var(--s3);
  }

  .page-about .about-columns__item:nth-child(odd) {
    padding-right: var(--s3);
  }

  .page-about .about-eco__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: var(--s3);
  }

  .page-about .about-contact__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--s3);
  }
}

@media (min-width: 1025px) {
  .page-about .about-eco__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-ver__track {
    padding-bottom: var(--s3);
  }
}

@media (max-width: 860px) {
  .page-about .about-hero__metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-hero__metric:nth-child(2) {
    border-right: 0;
  }

  .page-about .about-hero__metric:nth-child(1),
  .page-about .about-hero__metric:nth-child(2) {
    border-bottom: 1px solid var(--line-700);
  }
}

@media (max-width: 640px) {
  .page-about .about-tl::before {
    display: none;
  }

  .page-about .about-tl__item {
    grid-template-columns: 1fr;
    gap: 10px;
    padding-bottom: var(--s3);
  }

  .page-about .about-tl__mark {
    flex-direction: row;
    align-items: center;
    gap: 10px;
    padding-left: 18px;
  }

  .page-about .about-tl__dot {
    top: 50%;
    margin-top: -4.5px;
  }

  .page-about .about-zones__list {
    grid-template-columns: 1fr;
  }

  .page-about .about-zones__item {
    flex-direction: row;
    align-items: baseline;
    justify-content: space-between;
    border-right: 0;
    border-bottom: 1px solid var(--line-700);
  }

  .page-about .about-zones__item:last-child {
    border-bottom: 0;
  }

  .page-about .about-hero__frame {
    min-height: 480px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-ver__card,
  .page-about .about-columns__item,
  .page-about .about-zones__item {
    transition: none;
  }

  .page-about .about-ver__card:hover {
    transform: none;
  }
}