/* ===== 品牌自述页 · page-about ===== */
.page-about{
  --about-pad:20px;
  --about-rail:72px;
  --about-gutter:32px;
  --about-measure:36em;
}
@media (min-width:768px){
  .page-about{
    --about-pad:40px;
    --about-rail:88px;
    --about-gutter:56px;
  }
}

/* --- 面包屑 --- */
.page-about .about-crumb{
  padding-block:10px 24px;
}

/* --- 开篇 --- */
.page-about .about-intro{
  position:relative;
  margin-bottom:clamp(48px,8vw,104px);
}
.page-about .about-intro__media{
  position:relative;
  width:calc(100% - (var(--about-pad) * 2));
  max-width:1440px;
  margin-inline:auto;
  aspect-ratio:16 / 7;
  overflow:hidden;
  border-radius:14px;
  background:var(--c-deep);
}
.page-about .about-intro__media img{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
  object-position:center 62%;
  filter:saturate(.72) contrast(1.06) brightness(.82);
}
.page-about .about-intro__media::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:linear-gradient(180deg,
    rgba(6,11,26,.30) 0%,
    rgba(6,11,26,.58) 46%,
    rgba(6,11,26,.92) 82%,
    var(--c-void) 100%);
}
.page-about .about-intro__body{
  position:relative;
  z-index:2;
  margin-top:calc(-1 * clamp(56px,15vw,170px));
}
.page-about .about-intro__eyebrow{
  margin:0 0 16px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--c-ink-2);
}
.page-about .about-intro__title{
  margin:0 0 22px;
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(42px,11vw,112px);
  line-height:.92;
  letter-spacing:-.02em;
  color:var(--c-ink);
}
.page-about .about-intro__lede{
  max-width:33em;
  margin:0;
  font-size:clamp(16px,1.15vw,18px);
  line-height:1.78;
  color:var(--c-ink-2);
}

/* --- 开篇速览字段 --- */
.page-about .about-facts{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:1px;
  padding:1px;
  margin:40px 0 0;
  background:var(--c-line);
  list-style:none;
}
@media (min-width:900px){
  .page-about .about-facts{
    grid-template-columns:repeat(4,minmax(0,1fr));
  }
}
.page-about .about-facts > div{
  background:var(--c-void);
  padding:16px 14px 18px;
}
.page-about .about-facts dt{
  margin:0 0 10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--c-ink-2);
}
.page-about .about-facts dd{
  margin:0;
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:clamp(20px,3.2vw,30px);
  line-height:1;
  color:var(--c-ink);
}

/* --- 通用章节 --- */
.page-about .about-section{
  max-width:1240px;
  margin-inline:auto;
  padding-inline:var(--about-pad);
  padding-block:clamp(44px,7vw,92px);
}
.page-about .about-idx{
  margin:0 0 16px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--c-ink-2);
}
.page-about .about-h2{
  margin:0 0 22px;
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(26px,4.4vw,44px);
  line-height:1.06;
  letter-spacing:-.01em;
  color:var(--c-ink);
}
.page-about .about-h3{
  margin:44px 0 14px;
  font-size:17px;
  font-weight:700;
  color:var(--c-ink);
}
.page-about .about-copy p{
  max-width:var(--about-measure);
  margin:0 0 18px;
  font-size:16px;
  line-height:1.78;
  color:var(--c-ink);
}
.page-about .about-copy p:last-child{
  margin-bottom:0;
}

/* --- 超大数字锚点 --- */
.page-about .about-pull{
  margin:clamp(32px,5vw,56px) 0 0;
  overflow:hidden;
  display:flex;
  flex-direction:column;
  gap:12px;
}
.page-about .about-pull__num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:clamp(80px,24vw,236px);
  line-height:.8;
  letter-spacing:-.05em;
  color:rgba(233,238,248,.11);
  margin-left:-.03em;
}
.page-about .about-pull__cap{
  max-width:var(--about-measure);
  font-size:13px;
  line-height:1.7;
  color:var(--c-ink-2);
  border-left:2px solid var(--c-laliga);
  padding-left:14px;
}

/* --- 岗位分工 --- */
.page-about .about-roles{
  margin:32px 0 0;
  padding:0;
  list-style:none;
  border-top:1px solid var(--c-line);
}
@media (min-width:900px){
  .page-about .about-roles{
    display:grid;
    grid-template-columns:repeat(2,minmax(0,1fr));
    column-gap:var(--about-gutter);
  }
}
.page-about .about-role{
  display:grid;
  grid-template-columns:3.4rem minmax(0,1fr);
  column-gap:16px;
  row-gap:8px;
  align-items:start;
  padding:24px 0;
  border-bottom:1px solid var(--c-line);
}
.page-about .about-role__num{
  grid-row:1 / span 2;
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:28px;
  line-height:1;
  color:var(--c-ink);
}
.page-about .about-role__name{
  grid-column:2;
  margin:0;
  font-size:17px;
  font-weight:700;
  color:var(--c-ink);
}
.page-about .about-role__desc{
  grid-column:2;
  margin:0;
  font-size:15px;
  line-height:1.72;
  color:var(--c-ink-2);
}

/* --- 三个时点 --- */
.page-about .about-cycle{
  margin:0;
  padding:0;
  list-style:none;
}
.page-about .about-cycle li{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:6px;
  padding:16px 0;
  border-bottom:1px solid var(--c-line);
}
@media (min-width:760px){
  .page-about .about-cycle li{
    grid-template-columns:12rem minmax(0,1fr);
    gap:28px;
    align-items:baseline;
  }
}
.page-about .about-cycle__t{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:13px;
  letter-spacing:.04em;
  color:var(--c-yellow);
  white-space:nowrap;
}
.page-about .about-cycle__d{
  font-size:15px;
  line-height:1.72;
  color:var(--c-ink-2);
  max-width:42em;
}

/* --- 口径定义 --- */
.page-about .about-spec-layout{
  margin-top:34px;
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:32px;
}
@media (min-width:900px){
  .page-about .about-spec-layout{
    grid-template-columns:minmax(0,300px) minmax(0,1fr);
    gap:var(--about-gutter);
    align-items:start;
  }
}
.page-about .about-spec-media{
  overflow:hidden;
  border-radius:14px;
  background:var(--c-panel);
}
.page-about .about-spec-media img{
  display:block;
  width:100%;
  height:auto;
  aspect-ratio:1 / 1;
  object-fit:cover;
  filter:saturate(.7) contrast(1.08) brightness(.86);
}
.page-about .about-spec{
  margin:0;
  border-top:1px solid var(--c-line);
}
.page-about .about-spec__row{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:8px;
  padding:18px 0;
  border-bottom:1px solid var(--c-line);
}
@media (min-width:760px){
  .page-about .about-spec__row{
    grid-template-columns:11rem minmax(0,1fr);
    gap:28px;
    align-items:baseline;
  }
}
.page-about .about-spec dt{
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.06em;
  color:var(--c-ink-2);
}
.page-about .about-spec dd{
  margin:0;
  font-size:15px;
  line-height:1.76;
  color:var(--c-ink);
  max-width:38em;
}

/* --- 停顿区 --- */
.page-about .about-caesura{
  display:flex;
  justify-content:flex-end;
  align-items:center;
  max-width:1240px;
  margin-inline:auto;
  padding-inline:var(--about-pad);
  min-height:clamp(150px,26vw,320px);
}
.page-about .about-caesura__idx{
  margin:0;
  text-align:right;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.2em;
  color:var(--c-ink-2);
}

/* --- 版本演进 --- */
.page-about .about-versions__layout{
  margin-top:32px;
  display:grid;
  grid-template-columns:minmax(0,1fr);
}
.page-about .about-rail{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin:0 0 32px;
  padding:0;
  list-style:none;
}
.page-about .round-tick{
  display:inline-flex;
  align-items:center;
  gap:9px;
  padding:7px 12px;
  border:1px solid var(--c-line);
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--c-ink-2);
  text-decoration:none;
  transition:color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .round-tick::before{
  content:"";
  flex:none;
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--tick-c, var(--c-ink-2));
}
.page-about .round-tick:nth-of-type(1){ --tick-c:var(--c-seriea); }
.page-about .round-tick:nth-of-type(2){ --tick-c:var(--c-white); }
.page-about .round-tick:nth-of-type(3){ --tick-c:var(--c-bund); }
.page-about .round-tick:nth-of-type(4){ --tick-c:var(--c-green); }
.page-about .round-tick:hover,
.page-about .round-tick:focus-visible{
  color:var(--c-ink);
  border-color:var(--c-ink-2);
}
@media (min-width:900px){
  .page-about .about-versions__layout{
    grid-template-columns:var(--about-rail) minmax(0,1fr);
    column-gap:var(--about-gutter);
  }
  .page-about .about-rail{
    flex-direction:column;
    flex-wrap:nowrap;
    gap:0;
    margin:0;
    position:sticky;
    top:calc(var(--header-h) + 24px);
    align-self:start;
  }
  .page-about .round-tick{
    width:100%;
    padding:11px 0 11px 14px;
    border:0;
    border-left:2px solid transparent;
    border-radius:0;
    font-size:13px;
  }
  .page-about .round-tick:hover,
  .page-about .round-tick:focus-visible{
    border-color:var(--c-ink-2);
  }
  .page-about .round-tick[data-active="true"]{
    color:var(--c-ink);
    border-left-color:var(--c-yellow);
  }
}

.page-about .about-version{
  scroll-margin-top:calc(var(--header-h) + 24px);
}
.page-about .about-version + .about-version{
  margin-top:44px;
  padding-top:44px;
  border-top:1px solid var(--c-line);
}
.page-about .about-version__tag{
  margin:0 0 10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--c-ink-2);
}
.page-about .about-version__title{
  margin:0 0 16px;
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.02;
  letter-spacing:-.015em;
  color:var(--c-ink);
}
.page-about .about-version:nth-of-type(1) .about-version__title{ font-size:clamp(28px,4.6vw,46px); }
.page-about .about-version:nth-of-type(2) .about-version__title{ font-size:clamp(31px,5.2vw,54px); }
.page-about .about-version:nth-of-type(3) .about-version__title{ font-size:clamp(34px,5.8vw,62px); }
.page-about .about-version:nth-of-type(4) .about-version__title{ font-size:clamp(37px,6.4vw,72px); }
.page-about .about-version__desc{
  margin:0;
  max-width:38em;
  font-size:16px;
  line-height:1.78;
  color:var(--c-ink-2);
}
.page-about .about-version__media{
  margin-top:28px;
  overflow:hidden;
  border-radius:14px;
  background:var(--c-panel);
}
.page-about .about-version__media img{
  display:block;
  width:100%;
  height:auto;
  object-fit:cover;
  filter:saturate(.7) contrast(1.06) brightness(.84);
}
@media (min-width:900px){
  .page-about .about-version__media{
    width:min(100%,560px);
    margin-left:auto;
  }
}

/* --- 站点信息字段 --- */
.page-about .about-meta{
  margin:34px 0 0;
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:1px;
  padding:1px;
  background:var(--c-line);
}
@media (min-width:900px){
  .page-about .about-meta{
    grid-template-columns:repeat(4,minmax(0,1fr));
  }
}
.page-about .about-meta > div{
  background:var(--c-void);
  padding:16px 14px 18px;
}
.page-about .about-meta dt{
  margin:0 0 10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--c-ink-2);
}
.page-about .about-meta dd{
  margin:0;
  font-family:var(--font-mono);
  font-size:14px;
  line-height:1.5;
  color:var(--c-ink);
  word-break:break-word;
}

/* --- 继续查看 --- */
.page-about .about-links{
  padding-bottom:clamp(56px,8vw,110px);
}
.page-about .about-links__title{
  margin:0 0 18px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--c-ink-2);
}
.page-about .about-links ul{
  margin:0;
  padding:0;
  list-style:none;
  border-top:1px solid var(--c-line);
}
.page-about .about-links li{
  border-bottom:1px solid var(--c-line);
}
.page-about .about-links a{
  display:flex;
  align-items:baseline;
  gap:16px;
  padding:16px 0;
  font-size:16px;
  line-height:1.6;
  color:var(--c-ink);
  text-decoration:none;
  transition:color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}
.page-about .about-links a:hover,
.page-about .about-links a:focus-visible{
  color:var(--c-white);
  padding-left:10px;
}
.page-about .about-links .idx{
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--c-ink-2);
  flex:none;
}

@media (prefers-reduced-motion: reduce){
  .page-about .round-tick,
  .page-about .about-links a{
    transition:none;
  }
}
</main>