.page-about{
  --ab-panel: rgba(19,26,58,.58);
  --ab-fade: rgba(7,7,12,.32);
  padding-bottom: clamp(44px, 7vw, 100px);
}

.page-about img{
  max-width: 100%;
  height: auto;
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero{
  padding-top: clamp(24px, 5vw, 64px);
}

.page-about .about-hero__grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 54px);
  align-items: start;
  margin-top: clamp(22px, 4vw, 42px);
}

@media (min-width: 900px){
  .page-about .about-hero__grid{
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }
}

.page-about .about-hero h1{
  margin: 0.42em 0 0;
  font-family: var(--font-cjk);
  font-weight: 900;
  font-size: clamp(2.05rem, 6.6vw, 4.25rem);
  line-height: 1.06;
  letter-spacing: -0.035em;
  color: var(--light);
  max-width: 20ch;
}

.page-about .about-hero h1 em{
  font-style: normal;
  color: var(--cyan);
  text-shadow: 0 0 26px rgba(53,242,224,.42);
}

.page-about .about-hero__lede{
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 58ch;
  font-size: clamp(1.02rem, 1.5vw, 1.16rem);
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-hero__body{
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
}

/* 展签：本周期基本盘 */
.page-about .about-facts{
  position: relative;
  padding: 22px 20px 24px;
  border: 1px solid var(--line);
  border-top: 2px solid var(--cyan);
  background: linear-gradient(155deg, rgba(30,42,94,.62), rgba(7,7,12,.34) 72%);
}

.page-about .about-facts::after{
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 22px;
  height: 22px;
  background: linear-gradient(225deg, rgba(53,242,224,.3), transparent 68%);
  border-left: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-facts__title{
  margin: 0 0 14px;
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--muted);
}

.page-about .about-facts__row{
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 11px 0;
  border-bottom: 1px dashed var(--line);
}

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

.page-about .about-facts__num{
  font-family: var(--font-mono);
  font-size: 23px;
  font-weight: 700;
  line-height: 1.05;
  color: var(--cyan);
  text-shadow: 0 0 18px rgba(53,242,224,.55);
}

.page-about .about-facts__num--amber{
  color: var(--amber);
  text-shadow: 0 0 18px rgba(255,177,59,.5);
}

.page-about .about-facts__txt{
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--text);
}

/* 页内索引 */
.page-about .about-index{
  display: flex;
  flex-wrap: wrap;
  gap: 8px 6px;
  margin-top: clamp(26px, 4vw, 46px);
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.page-about .about-index a{
  display: inline-block;
  padding: 7px 13px;
  border: 1px solid var(--line);
  font-size: 12.5px;
  letter-spacing: .12em;
  line-height: 1.4;
  color: var(--muted);
  text-decoration: none;
  transition: color .18s var(--ease), border-color .18s var(--ease), background .18s var(--ease);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible{
  color: var(--light);
  border-color: var(--cyan);
}

.page-about .about-index a[aria-current]{
  color: var(--obsidian);
  background: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 沿革横带 ---------- */
.page-about .about-timeline{
  position: relative;
  overflow: hidden;
}

.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: .3;
  filter: saturate(.45) contrast(1.12);
}

.page-about .about-timeline__bg::after{
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(7,7,12,.95) 0%, rgba(19,26,58,.76) 52%, rgba(7,7,12,.92) 100%);
}

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

.page-about .about-timeline__note{
  margin: 14px 0 0;
  max-width: 56ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-tabs{
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .about-tabs__list{
  display: flex;
  flex-direction: row;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
}

.page-about .about-tabs__tab{
  flex: 0 0 auto;
  min-width: 190px;
  display: block;
  text-align: left;
  padding: 14px 16px 15px 18px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--line);
  background: rgba(7,7,12,.42);
  color: var(--muted);
  font-family: var(--font-cjk);
  cursor: pointer;
  transition: color .18s var(--ease), border-color .18s var(--ease), background .18s var(--ease);
}

.page-about .about-tabs__tab:hover{
  color: var(--text);
  border-left-color: var(--indigo-mid);
}

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

.page-about .about-tabs__tab[aria-selected="true"]{
  color: var(--light);
  border-left-color: var(--cyan);
  background: linear-gradient(90deg, rgba(53,242,224,.13), rgba(7,7,12,.2) 82%);
}

.page-about .about-tabs__idx{
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-about .about-tabs__name{
  display: block;
  margin-top: 7px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: inherit;
}

.page-about .about-tabs__when{
  display: block;
  margin-top: 5px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--muted);
}

.page-about .about-tabs__panel{
  margin-top: 22px;
  padding: 22px 0 clamp(56px, 9vw, 110px);
  border-top: 1px solid var(--line);
}

.page-about .about-tabs__heading{
  margin: 0 0 14px;
  font-size: clamp(1.15rem, 2.2vw, 1.5rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.35;
  color: var(--light);
}

.page-about .about-tabs__panel .prose{
  max-width: 64ch;
}

.page-about .about-tabs__meta{
  margin: 20px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--muted);
}

@media (min-width: 900px){
  .page-about .about-tabs{
    display: grid;
    grid-template-columns: minmax(196px, 236px) minmax(0, 1fr);
    column-gap: clamp(26px, 4vw, 60px);
    align-items: start;
  }

  .page-about .about-tabs__list{
    grid-column: 1;
    grid-row: 1 / span 3;
    flex-direction: column;
    gap: 6px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-tabs__tab{
    width: 100%;
    min-width: 0;
  }

  .page-about .about-tabs__panel{
    grid-column: 2;
    margin-top: 0;
    padding-top: 6px;
  }
}

/* ---------- 规则成因 ---------- */
.page-about .about-rules__grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(24px, 4vw, 42px);
  align-items: start;
}

@media (min-width: 960px){
  .page-about .about-rules__grid{
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }
}

.page-about .about-rules__body{
  max-width: 66ch;
}

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

.page-about .about-rules__figure .media-frame{
  border: 1px solid var(--line);
}

.page-about .about-range__lead{
  margin: clamp(34px, 5vw, 58px) 0 0;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--muted);
}

.page-about .about-range{
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

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

@media (min-width: 1100px){
  .page-about .about-range{
    grid-template-columns: repeat(8, minmax(0, 1fr));
  }
}

.page-about .about-range__item{
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 15px 13px 18px;
  background: var(--obsidian);
  border-top: 3px solid var(--line);
}

.page-about .about-range__item:nth-child(1){ border-top-color: #35F2E0; }
.page-about .about-range__item:nth-child(2){ border-top-color: #6BEBCB; }
.page-about .about-range__item:nth-child(3){ border-top-color: #A3E4B2; }
.page-about .about-range__item:nth-child(4){ border-top-color: #D6D79C; }
.page-about .about-range__item:nth-child(5){ border-top-color: #F4C877; }
.page-about .about-range__item:nth-child(6){ border-top-color: #FFB13B; }
.page-about .about-range__item:nth-child(7){ border-top-color: #FFA02B; }
.page-about .about-range__item:nth-child(8){ border-top-color: #FF8B1F; }

.page-about .about-range__code{
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--muted);
}

.page-about .about-range__span{
  font-family: var(--font-mono);
  font-size: 14.5px;
  line-height: 1.4;
  color: var(--light);
}

.page-about .about-range__foot{
  margin: 14px 0 0;
  max-width: 64ch;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 维护分工 ---------- */
.page-about .about-team__note{
  margin: 14px 0 0;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-team__grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(24px, 4vw, 42px);
  align-items: start;
}

@media (min-width: 960px){
  .page-about .about-team__grid{
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
  }
}

.page-about .about-team__figure .media-frame{
  border: 1px solid var(--line);
}

.page-about .about-team__lines{
  display: grid;
  gap: 14px;
}

.page-about .about-line{
  border-left-width: 3px;
  border-left-style: solid;
}

.page-about .about-line--edit{ border-left-color: var(--cyan); }
.page-about .about-line--check{ border-left-color: var(--amber); }
.page-about .about-line--care{ border-left-color: var(--magenta); }

.page-about .about-line .plaque__title{
  margin: 8px 0 10px;
  font-size: clamp(1.05rem, 2vw, 1.28rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.35;
  color: var(--light);
}

.page-about .about-line .plaque__desc{
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text);
  max-width: 62ch;
}

.page-about .about-line .plaque__tag{
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--muted);
}

.page-about .about-line .plaque__meta{
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 校对节拍 ---------- */
.page-about .about-cadence__list{
  --cad-indent: clamp(22px, 4vw, 42px);
  position: relative;
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0 0 0 var(--cad-indent);
}

.page-about .about-cadence__list::before{
  content: "";
  position: absolute;
  left: 6px;
  top: 40px;
  bottom: 40px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--amber) 58%, rgba(255,61,139,.65) 100%);
}

.page-about .about-cadence__item{
  position: relative;
  padding: 26px 0 28px;
  border-bottom: 1px dashed var(--line);
}

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

.page-about .about-cadence__item::before{
  content: "";
  position: absolute;
  left: calc(1px - var(--cad-indent));
  top: 34px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px var(--obsidian), 0 0 16px rgba(53,242,224,.75);
}

.page-about .about-cadence__item:nth-child(2)::before{
  background: var(--amber);
  box-shadow: 0 0 0 3px var(--obsidian), 0 0 16px rgba(255,177,59,.7);
}

.page-about .about-cadence__item:nth-child(3)::before{
  background: var(--magenta);
  box-shadow: 0 0 0 3px var(--obsidian), 0 0 16px rgba(255,61,139,.7);
}

.page-about .about-cadence__when{
  display: block;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-about .about-cadence__title{
  margin: 10px 0 8px;
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.35;
  color: var(--light);
}

.page-about .about-cadence__item p{
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text);
}

/* ---------- 收口 ---------- */
.page-about .about-next{
  margin-top: clamp(40px, 6vw, 76px);
  padding-top: clamp(24px, 3vw, 34px);
  border-top: 1px solid var(--line);
}

.page-about .about-next__lead{
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--muted);
}

.page-about .about-next__links{
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

@media (prefers-reduced-motion: reduce){
  .page-about *,
  .page-about *::before,
  .page-about *::after{
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }
}