.page-about{
  --about-line: rgba(42, 58, 82, 0.85);
  --about-card: var(--graphite-800);
  --about-dot: 13px;
  --about-track: 8px;
  color: var(--silver-200);
  font-family: var(--font-display);
  padding-bottom: 72px;
  overflow-x: hidden;
}

.page-about p{
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.75;
  max-width: 66ch;
}

.page-about .mono-note{
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted-500);
  margin: 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero{
  position: relative;
  display: grid;
  gap: 28px;
  padding: 18px 0 44px;
}

.page-about .about-hero::before{
  content: "";
  position: absolute;
  top: -40px;
  left: -10%;
  width: 70%;
  height: 320px;
  background: radial-gradient(circle at 20% 30%, rgba(78, 168, 222, 0.16), transparent 68%);
  pointer-events: none;
}

.page-about .about-hero__copy{
  position: relative;
  min-width: 0;
}

.page-about .about-hero__title{
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 8.4vw, 74px);
  line-height: 1.02;
  letter-spacing: -0.04em;
  color: var(--silver-050);
  margin: 14px 0 20px;
}

.page-about .about-hero__lede{
  font-size: 16px;
  line-height: 1.8;
  color: var(--silver-200);
  max-width: 58ch;
}

.page-about .about-hero__lede--dim{
  color: var(--muted-500);
  font-size: 15px;
}

.page-about .about-stats{
  display: flex;
  flex-wrap: wrap;
  gap: 12px 26px;
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-stats__item{
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.page-about .about-stats__num{
  font-family: var(--font-condensed);
  font-size: 30px;
  line-height: 1;
  color: var(--silver-050);
}

.page-about .about-stats__label{
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted-500);
}

.page-about .about-hero__media{
  margin: 0;
  position: relative;
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--about-line);
  background: var(--ink-900);
}

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

.page-about .about-hero__media figcaption{
  padding: 10px 16px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-hero__badge{
  position: absolute;
  top: 14px;
  right: 14px;
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  background: rgba(7, 13, 24, 0.72);
  border: 1px solid var(--benz-blue-500);
  color: var(--benz-blue-500);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
}

/* ---------- 章节外壳 ---------- */
.page-about .about-sec{
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  padding: 40px 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-sec__no{
  font-family: var(--font-condensed);
  font-size: 40px;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--steel-600);
  opacity: 0.85;
}

@supports (-webkit-text-stroke: 1px red){
  .page-about .about-sec__no{
    color: transparent;
    -webkit-text-stroke: 1px var(--benz-blue-500);
  }
}

.page-about .about-sec__body{
  display: grid;
  gap: 26px;
  min-width: 0;
}

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

.page-about .about-sec h2{
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 4.6vw, 38px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--silver-050);
  margin: 0 0 16px;
}

.page-about .about-sec__tail{
  margin-top: 18px;
  color: var(--muted-500);
  font-size: 15px;
}

.page-about .about-quote{
  margin: 22px 0 0;
  padding: 4px 0 4px 18px;
  border-left: 3px solid var(--benz-blue-500);
  font-family: var(--font-serif);
  font-size: 19px;
  line-height: 1.6;
  color: var(--silver-050);
  max-width: 46ch;
}

/* ---------- 人群卡 ---------- */
.page-about .crowd{
  display: grid;
  gap: 14px;
}

.page-about .crowd__card{
  --accent: var(--benz-blue-500);
  position: relative;
  padding: 22px 20px 18px;
  border-radius: var(--radius-card);
  background: var(--about-card);
  border: 1px solid var(--about-line);
  border-top: 2px solid var(--accent);
  transition: transform 0.26s var(--ease), border-color 0.26s var(--ease);
}

.page-about .crowd__card:nth-child(2){ --accent: var(--bmw-orange-500); }
.page-about .crowd__card:nth-child(3){ --accent: var(--cyan-glow-400); }

.page-about .crowd__card:hover,
.page-about .crowd__card:focus-within{
  transform: translateY(-2px);
  border-color: var(--accent);
  outline: none;
}

.page-about .crowd__card:focus-visible{
  outline: 2px solid var(--cyan-glow-400);
  outline-offset: 2px;
}

.page-about .crowd__tag{
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--accent);
  margin: 0 0 8px;
}

.page-about .crowd__title{
  font-size: 18px;
  font-weight: 700;
  color: var(--silver-050);
  margin: 0 0 10px;
  line-height: 1.35;
}

.page-about .crowd__text{
  font-size: 14px;
  line-height: 1.7;
  color: var(--silver-200);
  margin: 0 0 12px;
}

.page-about .crowd__note{
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted-500);
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--about-line);
  transition: color 0.26s var(--ease);
}

.page-about .crowd__card:hover .crowd__note,
.page-about .crowd__card:focus-within .crowd__note{
  color: var(--silver-200);
}

/* ---------- 图片块 ---------- */
.page-about .about-figure{
  margin: 0;
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--about-line);
  background: var(--ink-900);
}

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

.page-about .about-figure figcaption{
  padding: 10px 16px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-figure--square img{
  aspect-ratio: 1 / 1;
}

/* ---------- 四维刻度 ---------- */
.page-about .dims{
  display: grid;
  gap: 16px;
}

.page-about .dim{
  padding: 20px 18px;
  border-radius: 22px;
  background: linear-gradient(160deg, rgba(22, 35, 58, 0.9), rgba(12, 22, 38, 0.9));
  border: 1px solid var(--about-line);
  transition: border-color 0.26s var(--ease), transform 0.26s var(--ease);
}

.page-about .dim:hover,
.page-about .dim:focus-within{
  border-color: var(--benz-blue-500);
  transform: translateY(-2px);
}

.page-about .dim:focus-visible{
  outline: 2px solid var(--cyan-glow-400);
  outline-offset: 2px;
}

.page-about .dim__no{
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--benz-blue-500);
  margin: 0 0 8px;
}

.page-about .dim__name{
  font-size: 17px;
  font-weight: 700;
  color: var(--silver-050);
  margin: 0 0 12px;
}

.page-about .dim__scale{
  position: relative;
  height: var(--about-track);
  border-radius: var(--radius-pill);
  background-image: repeating-linear-gradient(
    90deg,
    var(--steel-600) 0 6px,
    transparent 6px 12px
  );
  overflow: hidden;
}

.page-about .dim__fill{
  position: absolute;
  inset: 0;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, rgba(78, 168, 222, 0), rgba(78, 168, 222, 0.55));
  opacity: 0.55;
  transition: opacity 0.26s var(--ease);
}

.page-about .dim:hover .dim__fill,
.page-about .dim:focus-within .dim__fill{
  opacity: 1;
}

.page-about .dim__note{
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted-500);
  margin: 12px 0 0;
  padding-top: 10px;
  border-top: 1px dashed var(--about-line);
  transition: color 0.26s var(--ease);
}

.page-about .dim:hover .dim__note,
.page-about .dim:focus-within .dim__note{
  color: var(--silver-200);
}

/* ---------- 评分维度列表 ---------- */
.page-about .score{
  margin: 20px 0 20px;
  border-top: 1px solid var(--about-line);
}

.page-about .score__row{
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--about-line);
  transition: border-color 0.24s var(--ease);
}

.page-about .score__row:hover{
  border-bottom-color: var(--benz-blue-500);
}

.page-about .score__key{
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--bmw-orange-500);
}

.page-about .score__desc{
  font-size: 14px;
  line-height: 1.7;
  color: var(--silver-200);
}

.page-about .score__desc,
.page-about .score__key{ min-width: 0; }

/* ---------- 团队数据 ---------- */
.page-about .metrics{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .metrics__row{
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 16px;
  border-radius: 16px;
  background: rgba(22, 35, 58, 0.55);
  border-left: 2px solid transparent;
  transition: background 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-about .metrics__row:hover{
  background: rgba(22, 35, 58, 0.95);
  border-left-color: var(--cyan-glow-400);
}

.page-about .metrics__num{
  font-family: var(--font-condensed);
  font-size: 34px;
  line-height: 1;
  color: var(--silver-050);
  min-width: 56px;
  text-align: right;
}

.page-about .metrics__label{
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted-500);
}

/* ---------- 时间轴 ---------- */
.page-about .tl-jump{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl-jump__link{
  display: inline-block;
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--about-line);
  background: rgba(22, 35, 58, 0.6);
  color: var(--silver-200);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-decoration: none;
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-about .tl-jump__link:hover,
.page-about .tl-jump__link:focus-visible{
  color: var(--benz-blue-500);
  border-color: var(--benz-blue-500);
  outline: none;
}

.page-about .timeline{
  --tl-x: 7px;
  position: relative;
  list-style: none;
  margin: 8px 0 0;
  padding: 0 0 0 30px;
}

.page-about .timeline::before{
  content: "";
  position: absolute;
  left: var(--tl-x);
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--benz-blue-500), var(--steel-600));
}

.page-about .tl-item{
  position: relative;
  padding-bottom: 30px;
  scroll-margin-top: 90px;
}

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

.page-about .tl-item::before{
  content: "";
  position: absolute;
  top: 8px;
  left: calc(var(--tl-x) - var(--about-dot) / 2 - 30px);
  width: var(--about-dot);
  height: var(--about-dot);
  border-radius: 50%;
  background: var(--abyss-950);
  border: 1px solid var(--benz-blue-500);
  transition: background 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-about .tl-item:hover::before{
  background: var(--cyan-glow-400);
  border-color: var(--cyan-glow-400);
}

.page-about .tl-item__year{
  font-family: var(--font-condensed);
  font-size: 30px;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--benz-blue-500);
  margin: 0 0 8px;
}

.page-about .tl-item__title{
  font-size: 17px;
  font-weight: 700;
  color: var(--silver-050);
  margin: 0 0 8px;
  line-height: 1.4;
}

.page-about .tl-item__text{
  font-size: 14px;
  line-height: 1.75;
  color: var(--silver-200);
  margin: 0;
  max-width: 60ch;
}

/* ---------- 更新节奏 ---------- */
.page-about .cadence{
  margin: 8px 0 0;
  border-top: 1px solid var(--about-line);
}

.page-about .cadence__row{
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--about-line);
  transition: border-bottom-color 0.24s var(--ease);
}

.page-about .cadence__row:hover{
  border-bottom-color: var(--bmw-orange-500);
}

.page-about .cadence__when{
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--bmw-orange-500);
}

.page-about .cadence__what{
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--silver-200);
}

.page-about .about-callout{
  padding: 24px 22px;
  background: linear-gradient(150deg, rgba(22, 35, 58, 0.95), rgba(12, 22, 38, 0.95));
  border: 1px solid var(--about-line);
  border-left: 2px solid var(--benz-blue-500);
  border-radius: var(--radius-card);
}

.page-about .about-callout__text{
  margin: 10px 0 20px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--silver-200);
}

.page-about .about-callout .btn{
  display: inline-block;
}

/* ---------- 断点 ---------- */
@media (min-width: 720px){
  .page-about .crowd{
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .dims{
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .cadence__row{
    grid-template-columns: 160px minmax(0, 1fr);
    gap: 18px;
    align-items: start;
  }
}

@media (min-width: 900px){
  .page-about{
    padding-bottom: 96px;
  }

  .page-about .about-hero{
    grid-template-columns: 7fr 5fr;
    align-items: end;
    gap: 48px;
    padding-top: 26px;
  }

  .page-about .about-hero__lede{
    font-size: 17px;
  }

  .page-about .about-sec{
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 34px;
    padding: 56px 0;
  }

  .page-about .about-sec__no{
    position: sticky;
    top: 26px;
    align-self: start;
    font-size: 64px;
  }

  .page-about .about-sec__body--split{
    grid-template-columns: 7fr 5fr;
    gap: 44px;
  }

  .page-about .about-sec__body--split .about-sec__main{
    grid-column: 1;
  }

  .page-about .about-sec__body--split .about-sec__side{
    grid-column: 2;
    grid-row: 1 / span 2;
  }

  .page-about .about-sec__body--split .dims{
    grid-column: 1 / -1;
  }

  .page-about .about-sec p{
    font-size: 17px;
  }

  .page-about .about-sec__body:not(.about-sec__body--split) .crowd{
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-figure--square img{
    aspect-ratio: 1 / 1;
  }

  .page-about .score__row{
    grid-template-columns: 140px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }

  .page-about .tl-item{
    padding-bottom: 38px;
  }

  .page-about .tl-item__year{
    font-size: 38px;
  }
}

@media (min-width: 1080px){
  .page-about .dims{
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-sec__body:not(.about-sec__body--split) .crowd{
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce){
  .page-about .crowd__card,
  .page-about .dim,
  .page-about .dim__fill,
  .page-about .crowd__note,
  .page-about .dim__note,
  .page-about .metrics__row,
  .page-about .score__row,
  .page-about .cadence__row{
    transition: none;
  }
  .page-about .crowd__card:hover,
  .page-about .dim:hover,
  .page-about .dim:focus-within{
    transform: none;
  }
}
<<<END>>>