.page-about{
  --ab-ink-soft: #C6CFC7;
  --ab-ink-dim: #B9C4BC;
  --ab-paper-ink: #2E4A3C;
  background: var(--ink);
  color: var(--paper);
}

.page-about .mono{
  font-family: var(--ff-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .04em;
}

/* 面包屑 */
.page-about .crumbs{
  padding: 18px 0 0;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--muted);
}
.page-about .crumbs a{
  color: var(--muted);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color .15s ease, border-color .15s ease;
}
.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible{
  color: var(--lime);
  border-bottom-color: var(--lime);
}
.page-about .crumbs__sep{ margin: 0 8px; color: var(--line); }
.page-about .crumbs [aria-current]{ color: var(--paper); }

/* 首屏 */
.page-about .hero{ padding: 26px 0 0; }
.page-about .hero__grid{ display: grid; gap: 28px; }
.page-about .hero__kicker{
  margin: 0;
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--lime);
  padding-bottom: 12px;
  border-bottom: 2px solid var(--line);
}
.page-about .hero h1{
  font-family: var(--ff-display);
  font-weight: 800;
  font-size: clamp(36px, 9vw, 74px);
  line-height: .98;
  letter-spacing: -.02em;
  margin: 18px 0 0;
  color: var(--paper);
}
.page-about .hero__lead{
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ab-ink-soft);
  max-width: 36em;
}
.page-about .hero__stats{
  display: flex;
  flex-wrap: wrap;
  gap: 16px 28px;
  list-style: none;
  margin: 26px 0 0;
  padding: 18px 0 0;
  border-top: 2px solid var(--line);
}
.page-about .hero__stats li{ display: flex; flex-direction: column; gap: 5px; }
.page-about .hero__stats b{
  font-size: 26px;
  line-height: 1;
  color: var(--lime);
}
.page-about .hero__stats span{
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
}
.page-about .hero__fig{
  margin: 0;
  border: 2px solid var(--line);
  box-shadow: var(--shadow);
  background: var(--ink-2);
}
.page-about .hero__fig img{
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}
.page-about .media-caption{
  font-size: 11.5px;
  line-height: 1.6;
  letter-spacing: .04em;
  color: var(--muted);
  padding: 10px 12px;
  border-top: 2px solid var(--line);
  background: var(--ink-2);
}

/* 目录条 */
.page-about .index{
  display: flex;
  gap: 10px;
  overflow-x: auto;
  margin-top: 30px;
  padding: 16px 0 18px;
  border-top: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
}
.page-about .index a{
  flex: 0 0 auto;
  display: inline-flex;
  gap: 8px;
  align-items: baseline;
  padding: 8px 14px;
  border: 2px solid var(--line);
  background: var(--ink-2);
  color: var(--paper);
  font-size: 13px;
  letter-spacing: .06em;
  text-decoration: none;
  transition: border-color .15s ease, color .15s ease, transform .15s ease;
}
.page-about .index a:hover,
.page-about .index a:focus-visible{
  border-color: var(--lime);
  color: var(--lime);
  transform: translateY(-2px);
}
.page-about .index .mono{ font-size: 12px; color: var(--lime); }

/* 区块与标题 */
.page-about .about-section{ padding: 52px 0; }
.page-about .sec-no{
  margin: 0;
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--lime);
}
.page-about .sec-head h2{
  font-family: var(--ff-display);
  font-weight: 800;
  font-size: clamp(28px, 6vw, 46px);
  line-height: 1.04;
  letter-spacing: -.02em;
  margin: 12px 0 0;
  color: var(--paper);
}
.page-about .sec-lead{
  margin: 14px 0 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--ab-ink-soft);
  max-width: 40em;
}

/* 方法四宫格 */
.page-about .about-method{
  background: var(--ink-2);
  border-top: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
}
.page-about .struct-grid{
  display: grid;
  gap: 16px;
  margin-top: 30px;
}
.page-about .struct-card{
  position: relative;
  padding: 24px 20px 20px;
  background: var(--ink);
  border: 2px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
  transition: background .18s ease, border-color .18s ease;
}
.page-about .struct-card:hover{ background: #0F2018; border-color: #3C5B49; }
.page-about .struct-card__no{
  position: absolute;
  top: 10px;
  right: 12px;
  font-size: 13px;
  color: var(--lime);
}
.page-about .struct-card h3{
  font-family: var(--ff-display);
  font-weight: 700;
  font-size: 24px;
  letter-spacing: .01em;
  margin: 0 0 10px;
  color: var(--lime);
}
.page-about .struct-card p{
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ab-ink-soft);
}
.page-about .struct-card svg{
  display: block;
  width: 100%;
  height: auto;
  margin: 16px 0 14px;
  color: var(--blue);
}
.page-about .struct-card__link{ margin-top: 4px !important; }
.page-about .struct-card__link a{
  color: var(--lime);
  font-size: 12.5px;
  letter-spacing: .06em;
  text-decoration: none;
  border-bottom: 2px solid var(--line);
  transition: border-color .15s ease;
}
.page-about .struct-card__link a:hover,
.page-about .struct-card__link a:focus-visible{ border-bottom-color: var(--lime); }

/* 团队 */
.page-about .about-team{ background: var(--ink); }
.page-about .team-bar{
  display: flex;
  margin-top: 30px;
  height: 60px;
  border: 2px solid var(--line);
  box-shadow: var(--shadow-sm);
}
.page-about .team-bar__seg{
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  font-family: var(--ff-mono);
  font-size: 14px;
  color: #0B1410;
  text-decoration: none;
  border-right: 2px solid var(--line);
  transition: filter .15s ease;
}
.page-about .team-bar__seg:last-child{ border-right: 0; }
.page-about .team-bar__seg:hover,
.page-about .team-bar__seg:focus-visible{ filter: brightness(1.18); }
.page-about .seg-data{ width: 34.4%; background: var(--lime); }
.page-about .seg-edit{ width: 28.1%; background: var(--blue); }
.page-about .seg-prod{ width: 21.9%; background: var(--paper); }
.page-about .seg-serv{ width: 15.6%; background: var(--orange); }

.page-about .team-notes{
  display: grid;
  gap: 14px;
  margin-top: 24px;
}
.page-about .team-note{
  padding: 18px;
  background: var(--ink-2);
  border: 2px solid var(--line);
  border-left: 4px solid var(--line);
  scroll-margin-top: 24px;
  transition: border-color .18s ease, background .18s ease;
}
.page-about .team-note:target{
  border-color: var(--lime);
  background: #16281F;
}
.page-about .team-note h3{
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 8px;
  font-family: var(--ff-display);
  font-weight: 700;
  font-size: 22px;
  color: var(--paper);
}
.page-about .team-note h3 .mono{
  font-size: 14px;
  letter-spacing: .08em;
  color: var(--lime);
}
.page-about .team-note p{
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ab-ink-soft);
}

/* 时间轴 */
.page-about .about-timeline{
  background: var(--paper);
  color: var(--ink);
  border-top: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
}
.page-about .about-timeline .sec-no--chip{
  display: inline-block;
  background: var(--ink);
  color: var(--lime);
  padding: 5px 10px;
}
.page-about .about-timeline .sec-head h2{ color: var(--ink); }
.page-about .about-timeline .sec-lead{ color: var(--ab-paper-ink); }
.page-about .tl-fig{
  margin: 0 0 28px;
  border: 2px solid var(--ink);
  box-shadow: 6px 6px 0 var(--line);
  background: var(--ink-2);
}
.page-about .tl-fig img{
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}
.page-about .tl-fig .media-caption{
  background: var(--ink);
  color: var(--paper);
  border-top: 2px solid var(--line);
}
.page-about .tl{
  position: relative;
  list-style: none;
  margin: 30px 0 0;
  padding: 0 0 0 24px;
}
.page-about .tl::before{
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 12px;
  width: 2px;
  background: var(--line);
}
.page-about .tl__item{
  position: relative;
  padding-bottom: 26px;
}
.page-about .tl__item::before{
  content: "";
  position: absolute;
  left: -24px;
  top: 6px;
  width: 14px;
  height: 14px;
  background: var(--lime);
  border: 2px solid var(--ink);
  box-sizing: border-box;
}
.page-about .tl__year{
  display: block;
  font-size: 20px;
  line-height: 1;
  color: var(--ab-paper-ink);
  letter-spacing: .04em;
}
.page-about .tl__body h3{
  margin: 8px 0 6px;
  font-family: var(--ff-display);
  font-weight: 700;
  font-size: 21px;
  line-height: 1.2;
  color: var(--ink);
}
.page-about .tl__body p{
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: #3A463F;
}
.page-about .tl__more{
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  margin: 0 !important;
  padding-left: 12px;
  border-left: 3px solid var(--line);
  font-size: 13.5px !important;
  color: #4A5A50 !important;
  transition: max-height .22s ease, opacity .22s ease, margin .22s ease;
}
.page-about .tl__item:hover .tl__more,
.page-about .tl__item:focus-within .tl__more{
  max-height: 240px;
  opacity: 1;
  margin-top: 10px !important;
}

/* 节奏 */
.page-about .about-cadence{
  background: var(--ink);
  padding-bottom: 56px;
}
.page-about .about-band{
  margin: 32px 0 0;
  border-top: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
  background: var(--ink-2);
}
.page-about .about-band img{
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}
.page-about .week{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(148px, 1fr));
  gap: 10px;
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}
.page-about .week__day{
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 14px;
  background: var(--ink-2);
  border: 2px solid var(--line);
  transition: border-color .15s ease, background .15s ease;
}
.page-about .week__day:hover,
.page-about .week__day:focus,
.page-about .week__day:focus-within{
  border-color: var(--lime);
  background: #16281F;
  outline: none;
}
.page-about .week__day:focus-visible{ outline: 3px solid var(--lime); outline-offset: 2px; }
.page-about .week__label{
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--muted);
}
.page-about .week__tag{
  font-family: var(--ff-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.15;
  color: var(--paper);
}
.page-about .week__day--hot .week__tag{ color: var(--orange); }
.page-about .week__detail{
  margin: 0;
  font-size: 13px;
  line-height: 1.68;
  color: var(--ab-ink-dim);
}

/* 合作 */
.page-about .about-partners{
  background: var(--ink-2);
  border-top: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
}
.page-about .partner-pair{
  display: grid;
  gap: 16px;
  margin-top: 30px;
}
.page-about .partner-num{
  padding: 22px 20px;
  background: var(--white);
  color: var(--ink);
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-sm);
}
.page-about .partner-num b{
  display: block;
  font-size: 52px;
  line-height: .9;
  color: #0F2A1E;
}
.page-about .partner-num span{
  display: block;
  margin-top: 8px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--orange);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--ab-paper-ink);
}
.page-about .partner-num p{
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: #3A463F;
}
.page-about .api-title{
  margin: 34px 0 0;
  font-family: var(--ff-display);
  font-weight: 700;
  font-size: 22px;
  color: var(--paper);
  padding-bottom: 10px;
  border-bottom: 2px solid var(--line);
}
.page-about .api-list{
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .api-list li{
  padding: 8px 0 8px 14px;
  border-left: 4px solid var(--lime);
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ab-ink-soft);
}
.page-about .api-cta{ margin: 26px 0 0; }

/* 收束三栏 */
.page-about .about-close{
  background: var(--paper);
  color: var(--ink);
  padding: 48px 0 56px;
}
.page-about .about-close h2{
  font-family: var(--ff-display);
  font-weight: 800;
  font-size: clamp(26px, 5.5vw, 40px);
  line-height: 1.06;
  letter-spacing: -.02em;
  margin: 0;
  color: var(--ink);
}
.page-about .about-close__grid{
  display: grid;
  gap: 16px;
  margin-top: 26px;
}
.page-about .close-card{
  padding: 22px 20px;
  background: var(--white);
  border: 2px solid var(--ink);
  box-shadow: 6px 6px 0 var(--line);
}
.page-about .close-card__no{
  display: block;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--orange);
}
.page-about .close-card h3{
  margin: 10px 0 8px;
  font-family: var(--ff-display);
  font-weight: 700;
  font-size: 22px;
  color: var(--ink);
}
.page-about .close-card p{
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.72;
  color: #3A463F;
}
.page-about .close-card a{
  display: inline-block;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 3px solid var(--lime);
  padding-bottom: 2px;
  transition: border-color .15s ease, transform .15s ease;
}
.page-about .close-card a:hover,
.page-about .close-card a:focus-visible{
  border-bottom-color: var(--orange);
  transform: translateY(-2px);
}

/* 平板 */
@media (min-width: 680px){
  .page-about .hero{ padding-top: 34px; }
  .page-about .struct-grid{ grid-template-columns: repeat(2, 1fr); gap: 18px; }
  .page-about .team-bar{ height: 68px; }
  .page-about .team-bar__seg{ font-size: 16px; }
  .page-about .team-notes{ grid-template-columns: repeat(2, 1fr); }
  .page-about .partner-pair{ grid-template-columns: repeat(2, 1fr); }
  .page-about .about-close__grid{ grid-template-columns: repeat(3, 1fr); }
  .page-about .about-section{ padding: 62px 0; }
  .page-about .week{ grid-template-columns: repeat(4, 1fr); }
}

/* 桌面 */
@media (min-width: 980px){
  .page-about .hero__grid{
    grid-template-columns: 7fr 5fr;
    gap: 40px;
    align-items: start;
  }
  .page-about .hero__fig{ margin-top: 8px; }
  .page-about .index{ gap: 12px; }
  .page-about .about-timeline__grid{
    display: grid;
    grid-template-columns: 5fr 7fr;
    gap: 44px;
    align-items: start;
  }
  .page-about .tl-fig{ margin: -8px 0 0; }
  .page-about .tl-wrap{ padding-top: 0; }
  .page-about .week{ grid-template-columns: repeat(7, 1fr); }
  .page-about .api-list{ grid-template-columns: repeat(2, 1fr); gap: 14px 24px; }
  .page-about .about-close__grid{ gap: 20px; }
}

/* 排期详情折叠：仅有悬停能力的设备才收起 */
@media (hover: hover) and (min-width: 680px){
  .page-about .week__detail{
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height .22s ease, opacity .22s ease, margin .22s ease;
    margin-top: -8px;
  }
  .page-about .week__day:hover .week__detail,
  .page-about .week__day:focus .week__detail,
  .page-about .week__day:focus-within .week__detail{
    max-height: 180px;
    opacity: 1;
    margin-top: 0;
  }
}

@media (prefers-reduced-motion: reduce){
  .page-about *{
    transition: none !important;
    animation: none !important;
  }
}
<<<END>>>