.page-about {
  --about-rail: 64px;
  --about-glow: radial-gradient(120% 90% at 12% 0%, rgba(110, 75, 255, .22), rgba(5, 7, 14, 0) 62%);
}

.page-about .about-hero {
  position: relative;
  padding-top: clamp(104px, 15vh, 172px);
  padding-bottom: clamp(40px, 6vw, 80px);
  background: var(--about-glow);
}

.page-about .about-hero__frame {
  position: relative;
  padding: clamp(26px, 4.2vw, 58px);
  overflow: hidden;
  background-image:
    radial-gradient(70% 110% at 88% 0%, rgba(110, 75, 255, .16), transparent 62%),
    linear-gradient(180deg, rgba(11, 16, 32, .88), rgba(5, 7, 14, .97));
}

.page-about .about-corners {
  position: absolute;
  inset: 12px;
  pointer-events: none;
}

.page-about .about-corners i {
  position: absolute;
  width: 16px;
  height: 16px;
  border: 1px solid var(--line);
}

.page-about .about-corners i:nth-child(1) { top: 0; left: 0; border-right: 0; border-bottom: 0; }
.page-about .about-corners i:nth-child(2) { top: 0; right: 0; border-left: 0; border-bottom: 0; }
.page-about .about-corners i:nth-child(3) { bottom: 0; left: 0; border-right: 0; border-top: 0; }
.page-about .about-corners i:nth-child(4) { bottom: 0; right: 0; border-left: 0; border-top: 0; }

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 5vw, 64px);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
}

.page-about .about-hero__sub {
  margin: 10px 0 0;
  font-size: clamp(16px, 2vw, 20px);
  font-weight: 300;
  letter-spacing: .04em;
  color: var(--mute);
}

.page-about .about-hero__lede {
  margin: clamp(20px, 3vw, 32px) 0 0;
  max-width: 46ch;
}

.page-about .about-hero__facts {
  margin: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  align-self: end;
}

.page-about .about-fact {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 6px 12px;
  padding: 14px 16px;
  background: var(--ink-800);
}

.page-about .about-fact dt {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--mute);
}

.page-about .about-fact dd {
  margin: 0;
  font-size: 17px;
  color: var(--hi);
}

@media (min-width: 920px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.42fr) minmax(230px, .58fr);
    align-items: end;
  }
}

/* 02 星轨时间轴 */
.page-about .about-track {
  position: relative;
  overflow: hidden;
}

.page-about .about-track__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: .26;
  -webkit-mask-image: linear-gradient(180deg, transparent, #000 20%, #000 80%, transparent);
  mask-image: linear-gradient(180deg, transparent, #000 20%, #000 80%, transparent);
}

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

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

.page-about .about-track__lede {
  max-width: 52ch;
}

.page-about .about-track__rail {
  position: relative;
  margin: clamp(36px, 6vw, 68px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-track__orbit {
  position: absolute;
  top: 0;
  left: 0;
  display: block;
  width: var(--about-rail);
  height: 100%;
  pointer-events: none;
}

.page-about .about-track__item {
  display: grid;
  grid-template-columns: var(--about-rail) minmax(0, 1fr);
  gap: clamp(14px, 3vw, 34px);
  padding-bottom: calc(34px + var(--step, 0) * 26px);
  min-width: 0;
}

.page-about .about-track__item:nth-of-type(1) { --step: 0; }
.page-about .about-track__item:nth-of-type(2) { --step: 1; }
.page-about .about-track__item:nth-of-type(3) { --step: 2; }
.page-about .about-track__item:nth-of-type(4) { --step: 3; }
.page-about .about-track__item:nth-of-type(5) { --step: 4; padding-bottom: 0; }

.page-about .about-track__mark {
  position: relative;
}

.page-about .about-track__mark::before {
  content: "";
  position: absolute;
  top: 8px;
  left: calc(var(--about-rail) / 2 - 4.5px);
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(232, 180, 92, .12), 0 0 16px rgba(232, 180, 92, .45);
}

.page-about .about-track__content {
  min-width: 0;
}

.page-about .about-track__year {
  display: block;
  font-size: 13px;
  letter-spacing: .16em;
}

.page-about .about-track__title {
  margin: 8px 0 0;
  font-size: clamp(19px, 2.4vw, 26px);
  font-weight: 400;
  line-height: 1.45;
  color: var(--hi);
}

.page-about .about-track__line {
  margin: 10px 0 0;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--body);
}

.page-about .about-track__more {
  margin-top: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(11, 16, 32, .62);
  transition: border-color .24s ease;
}

.page-about .about-track__more[open] {
  border-color: var(--violet);
}

.page-about .about-track__more summary {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  box-sizing: border-box;
  padding: 12px 16px;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--mute);
  cursor: pointer;
  list-style: none;
}

.page-about .about-track__more summary::-webkit-details-marker { display: none; }

.page-about .about-track__more summary::before {
  content: "+";
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-track__more[open] summary::before { content: "−"; }

.page-about .about-track__more summary:hover { color: var(--hi); }

.page-about .about-track__more summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-about .about-track__more-body {
  padding: 0 16px 16px;
}

.page-about .about-track__more-body p {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--body);
}

/* 03 团队分工 */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 54px);
}

.page-about .about-team__intro .prose {
  max-width: 54ch;
  margin-top: clamp(18px, 2.4vw, 26px);
}

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

.page-about .about-team__blocks {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(32px, 5vw, 60px);
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-team__block {
  padding: clamp(20px, 3vw, 30px) clamp(16px, 2.4vw, 26px);
  background: var(--ink-800);
}

.page-about .about-team__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--gold);
}

.page-about .about-team__block h3 {
  margin: 12px 0 0;
  font-size: clamp(17px, 2vw, 22px);
  font-weight: 400;
  color: var(--hi);
}

.page-about .about-team__block p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--body);
}

@media (min-width: 760px) {
  .page-about .about-team__blocks {
    grid-template-columns: 1.35fr 1fr 1.15fr;
  }
}

@media (min-width: 920px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, .7fr);
    align-items: start;
  }
}

/* 04 分类维护 */
.page-about .about-rules__lede {
  max-width: 56ch;
}

.page-about .about-rules__list {
  margin-top: clamp(32px, 5vw, 56px);
  border-top: 1px solid var(--line);
}

.page-about .about-rules__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: clamp(18px, 2.6vw, 26px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-rules__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-about .about-rules__name {
  margin: 0;
  font-size: clamp(17px, 1.9vw, 20px);
  font-weight: 400;
  color: var(--hi);
}

.page-about .about-rules__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--body);
}

@media (min-width: 760px) {
  .page-about .about-rules__row {
    grid-template-columns: 56px minmax(140px, 220px) minmax(0, 1fr);
    gap: 0 20px;
    align-items: baseline;
  }
}

/* 05 协作同步 */
.page-about .about-sync__lede {
  max-width: 58ch;
}

.page-about .about-sync__scale {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(32px, 5vw, 52px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-sync__tick {
  position: relative;
  padding: 46px 18px 22px;
  background: var(--ink-800);
  transition: background .24s ease;
}

.page-about .about-sync__tick::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--line);
  transition: background .24s ease;
}

.page-about .about-sync__tick:hover,
.page-about .about-sync__tick:focus-within {
  background: var(--ink-700);
}

.page-about .about-sync__tick:hover::before,
.page-about .about-sync__tick:focus-within::before {
  background: var(--violet);
}

.page-about .about-sync__tick:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-about .about-sync__q {
  position: absolute;
  top: 18px;
  left: 18px;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--gold);
}

.page-about .about-sync__scope {
  display: block;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mute);
  transition: color .24s ease;
}

.page-about .about-sync__tick:hover .about-sync__scope,
.page-about .about-sync__tick:focus-within .about-sync__scope {
  color: var(--body);
}

@media (min-width: 700px) {
  .page-about .about-sync__scale {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-sync__tick {
    min-height: 154px;
  }
}

/* 06 口径一览 */
.page-about .about-facts__lede {
  max-width: 54ch;
}

.page-about .about-facts__wrap {
  margin-top: clamp(30px, 4.5vw, 52px);
  border: 1px solid var(--line);
  background: var(--ink-800);
  overflow: hidden;
}

.page-about .about-facts__table {
  width: 100%;
  border-collapse: collapse;
}

.page-about .about-facts__table thead th {
  padding: 14px 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: .18em;
  text-align: left;
  color: var(--mute);
  border-bottom: 1px solid var(--line);
}

.page-about .about-facts__table tbody tr {
  border-bottom: 1px solid rgba(42, 52, 80, .55);
}

.page-about .about-facts__table tbody tr:last-child {
  border-bottom: 0;
}

.page-about .about-facts__table td {
  padding: 14px 18px;
  font-size: 15.5px;
  line-height: 1.6;
  color: var(--body);
  vertical-align: top;
}

.page-about .about-facts__table td + td {
  font-family: var(--font-mono);
  color: var(--hi);
  white-space: nowrap;
}

@media (min-width: 620px) {
  .page-about .about-facts__table td:first-child {
    width: 58%;
  }
}

@media (max-width: 619px) {
  .page-about .about-facts__table thead {
    display: none;
  }
  .page-about .about-facts__table,
  .page-about .about-facts__table tbody,
  .page-about .about-facts__table tr,
  .page-about .about-facts__table td {
    display: block;
    width: 100%;
  }
  .page-about .about-facts__table tbody tr {
    padding: 14px 16px;
  }
  .page-about .about-facts__table td {
    padding: 0;
  }
  .page-about .about-facts__table td:first-child {
    font-size: 13px;
    letter-spacing: .06em;
    color: var(--mute);
  }
  .page-about .about-facts__table td + td {
    margin-top: 6px;
    font-size: 17px;
    white-space: normal;
  }
}

/* 07 内容审校 */
.page-about .about-review__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 5vw, 56px);
}

.page-about .about-review__body .prose {
  max-width: 56ch;
}

.page-about .about-review__steps {
  margin: clamp(26px, 3.6vw, 40px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-review__steps li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 4px 12px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--violet);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: rgba(11, 16, 32, .58);
}

.page-about .about-review__num {
  grid-row: span 2;
  padding-top: 3px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-about .about-review__label {
  font-size: 16px;
  color: var(--hi);
}

.page-about .about-review__desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--mute);
}

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

@media (min-width: 880px) {
  .page-about .about-review__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 420px);
    align-items: center;
  }
}

/* 收束声明 */
.page-about .about-close__panel {
  display: grid;
  gap: 22px;
  padding: clamp(24px, 4vw, 46px);
  border: 1px solid var(--line);
  border-top: 2px solid var(--violet);
  background: linear-gradient(180deg, rgba(110, 75, 255, .1), rgba(5, 7, 14, .66));
}

.page-about .about-close__text {
  margin: 0;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--body);
}

.page-about .about-close__links {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 26px;
}

.page-about .about-close__links a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  font-size: 15px;
  color: var(--body);
  text-decoration: none;
}

.page-about .about-close__links a::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  flex: none;
}

.page-about .about-close__links a:hover {
  color: var(--hi);
}

.page-about .about-close__links a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

@media (max-width: 520px) {
  .page-about {
    --about-rail: 40px;
  }

  .page-about .about-hero__frame {
    padding: 22px 18px;
  }

  .page-about .about-corners {
    inset: 8px;
  }

  .page-about .about-track__mark::before {
    top: 6px;
    left: calc(var(--about-rail) / 2 - 4px);
    width: 8px;
    height: 8px;
  }

  .page-about .about-sync__tick {
    padding: 42px 14px 18px;
  }
}