.page-about {
  --gold-ink: #8A5A0B;
  --track-x: 7px;
  background: var(--sand);
  color: var(--ink);
  font-family: var(--font-body);
}

.page-about .wrap {
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: 20px;
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  padding-top: 26px;
  font-size: 12px;
  letter-spacing: .08em;
}
.page-about .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--mid);
  opacity: .5;
}
.page-about .crumbs a {
  color: var(--mid);
  text-decoration: none;
}
.page-about .crumbs a:hover { color: var(--gold-ink); }
.page-about .crumbs [aria-current] { color: var(--charcoal); }

/* ---------- 首屏 ---------- */
.page-about .intro {
  padding: 28px 0 48px;
  border-bottom: 1px solid var(--hair);
}
.page-about .intro__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--mid);
}
.page-about .intro h1 {
  margin: 20px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(38px, 9.2vw, 92px);
  line-height: 1.04;
  letter-spacing: -.02em;
  color: var(--ink);
}
.page-about .intro__lede {
  margin: 26px 0 0;
  max-width: 38ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--charcoal);
}
.page-about .intro__index {
  margin: 40px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
}
.page-about .intro__index li {
  border-top: 1px solid var(--hair);
}
.page-about .intro__index a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 13px 0 8px;
  color: var(--ink);
  text-decoration: none;
  font-size: 15px;
  line-height: 1.5;
  transition: color .25s var(--ease);
}
.page-about .intro__index a:hover { color: var(--gold-ink); }
.page-about .intro__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--gold-ink);
  flex: 0 0 auto;
}

/* ---------- 章节骨架 ---------- */
.page-about .chapter {
  padding: 56px 0 8px;
}
.page-about .chapter__lead {
  margin: 0 0 36px;
}
.page-about .title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(26px, 5.6vw, 46px);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--ink);
}
.page-about .lede {
  margin: 18px 0 0;
  max-width: 40ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--charcoal);
}
.page-about .fig {
  margin: 0;
}
.page-about .frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.page-about .frame--shot {
  aspect-ratio: 3 / 2;
}
.page-about .frame__cap {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mid);
  max-width: 56ch;
}

/* ---------- 代际时间轨道 ---------- */
.page-about .track {
  position: relative;
  margin: 44px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .track::before {
  content: "";
  position: absolute;
  left: var(--track-x);
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, rgba(245, 166, 35, .6), rgba(245, 166, 35, .07));
}
.page-about .gen {
  position: relative;
  padding: 0 0 52px 40px;
}
.page-about .gen:last-child { padding-bottom: 0; }
.page-about .gen__dot {
  position: absolute;
  left: 0;
  top: 8px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--sand);
  border: 1px solid var(--gold);
  box-sizing: border-box;
}
.page-about .gen--live .gen__dot {
  background: var(--gold);
  box-shadow: 0 0 0 7px rgba(245, 166, 35, .16);
}
.page-about .gen__num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--gold-ink);
}
.page-about .gen__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(20px, 4.6vw, 28px);
  line-height: 1.35;
  color: var(--ink);
}
.page-about .gen__text {
  margin: 12px 0 0;
  max-width: 42ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--charcoal);
}
.page-about .gen__note {
  margin: 16px 0 0;
  max-width: 42ch;
  padding: 10px 14px;
  border-left: 2px solid var(--gold);
  background: var(--paper);
  font-size: 14px;
  line-height: 1.75;
  color: var(--charcoal);
}
.page-about .gen__fig {
  margin: 22px 0 0;
  max-width: 460px;
}
.page-about .gen__specs {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  max-width: 42ch;
}
.page-about .gen__specs li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px solid var(--hair-2);
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--charcoal);
}
.page-about .gen__specs b {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -.01em;
}
.page-about .gen__link {
  margin: 20px 0 0;
  font-size: 14.5px;
}
.page-about .gen__link a {
  color: var(--gold-ink);
  text-decoration: none;
  border-bottom: 1px solid var(--hair);
  padding-bottom: 2px;
}
.page-about .gen__link a:hover { border-bottom-color: var(--gold); }

/* ---------- 服务网络 ---------- */
.page-about .net {
  margin: 40px 0 0;
  display: grid;
  gap: 40px;
}
.page-about .net__list {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .net__item {
  padding: 20px 0 18px;
  border-top: 1px solid var(--hair);
}
.page-about .net__item:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .net__val {
  display: block;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(30px, 7.4vw, 44px);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.page-about .net__lab {
  display: block;
  margin-top: 10px;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 15.5px;
  line-height: 1.5;
  color: var(--ink);
}
.page-about .net__item p {
  margin: 6px 0 0;
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mid);
}

/* ---------- 门店实测 ---------- */
.page-about .field {
  margin: 40px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 26px;
}
.page-about .field__item {
  padding-left: 18px;
  border-left: 1px solid var(--hair);
}
.page-about .field__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--gold-ink);
}
.page-about .field__t {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 17px;
  line-height: 1.5;
  color: var(--ink);
}
.page-about .field__item p {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mid);
}

/* ---------- 人和课 ---------- */
.page-about .team {
  margin: 40px 0 0;
  display: grid;
  gap: 28px;
}
.page-about .team__block {
  padding-top: 20px;
  border-top: 2px solid var(--gold);
}
.page-about .team__k {
  display: block;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(28px, 6.4vw, 40px);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.page-about .team__t {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 16px;
  line-height: 1.5;
  color: var(--ink);
}
.page-about .team__block p {
  margin: 6px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mid);
}

/* ---------- 耐用标准 ---------- */
.page-about .crit {
  margin: 40px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .crit li {
  display: grid;
  grid-template-columns: 30px 1fr;
  gap: 0 14px;
  padding: 18px 0;
  border-top: 1px solid var(--hair);
}
.page-about .crit li:last-child {
  border-bottom: 1px solid var(--hair);
}
.page-about .crit__no {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--gold-ink);
  padding-top: 4px;
}
.page-about .crit__t {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 16.5px;
  line-height: 1.4;
  color: var(--ink);
}
.page-about .crit p {
  grid-column: 2;
  margin: 7px 0 0;
  max-width: 46ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mid);
}

.page-about .bars {
  margin: 48px 0 0;
  padding: 28px 22px 32px;
  background: var(--ink);
  border-radius: 2px;
}
.page-about .bars__cap {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--gold-soft);
}
.page-about .bars__list {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 18px;
}
.page-about .bar {
  display: grid;
  grid-template-columns: 66px 1fr auto;
  align-items: center;
  gap: 12px;
}
.page-about .bar__name {
  font-size: 13px;
  line-height: 1.4;
  color: rgba(250, 248, 243, .7);
}
.page-about .bar__track {
  display: block;
  height: 8px;
  border-radius: 4px;
  background: rgba(250, 248, 243, .1);
  overflow: hidden;
}
.page-about .bar__fill {
  display: block;
  height: 100%;
  border-radius: 4px;
  background: rgba(250, 248, 243, .42);
}
.page-about .bar__fill--v1 { width: 100%; }
.page-about .bar__fill--v2 { width: 57%; }
.page-about .bar__fill--v3 { width: 30%; }
.page-about .bar--live .bar__fill { background: var(--gold); }
.page-about .bar__val {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}
.page-about .bar--live .bar__val { color: var(--gold); }

/* ---------- 收尾 ---------- */
.page-about .outro {
  padding: 64px 0 0;
}
.page-about .outro__inner {
  padding: 36px 0 56px;
  border-top: 1px solid var(--hair);
}
.page-about .outro__t {
  margin: 14px 0 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(24px, 5.2vw, 38px);
  line-height: 1.25;
  letter-spacing: -.01em;
  color: var(--ink);
}
.page-about .outro__links {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
}
.page-about .outro__links li {
  border-top: 1px solid var(--hair-2);
}
.page-about .outro__links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 0;
  color: var(--ink);
  text-decoration: none;
  font-size: 15.5px;
  line-height: 1.6;
  transition: color .25s var(--ease);
}
.page-about .outro__links a::after {
  content: "→";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  color: var(--gold-ink);
}
.page-about .outro__links a:hover { color: var(--gold-ink); }

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .intro__index {
    grid-template-columns: repeat(3, 1fr);
    column-gap: 28px;
  }
  .page-about .net__list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    column-gap: 32px;
  }
  .page-about .net__item:first-child {
    padding-top: 20px;
    border-top: 1px solid var(--hair);
  }
  .page-about .net__item:nth-child(2) {
    border-top: 0;
    padding-top: 0;
  }
}

@media (min-width: 900px) {
  .page-about {
    --track-x: 199px;
  }
  .page-about .wrap {
    padding-inline: 40px 56px;
  }
  .page-about .intro {
    padding: 48px 0 80px;
  }
  .page-about .intro__lede { font-size: 17px; }
  .page-about .lede { font-size: 17px; }
  .page-about .chapter { padding: 96px 0 12px; }
  .page-about .chapter__lead { margin-bottom: 56px; }
  .page-about .track { margin-top: 56px; }

  .page-about .gen { padding: 0 0 76px 232px; }
  .page-about .gen:last-child { padding-bottom: 0; }
  .page-about .gen__dot { left: 192px; top: 10px; }
  .page-about .gen__num {
    position: absolute;
    left: 0;
    top: 6px;
    width: 160px;
    margin: 0;
    text-align: right;
  }
  .page-about .gen__text,
  .page-about .gen__note,
  .page-about .gen__specs { max-width: 50ch; }
  .page-about .gen__fig { max-width: 520px; }

  .page-about .net {
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: start;
    margin-top: 56px;
  }
  .page-about .net__list {
    grid-template-columns: 1fr;
    column-gap: 0;
  }
  .page-about .net__item:nth-child(2) {
    padding-top: 20px;
    border-top: 1px solid var(--hair);
  }

  .page-about .field {
    grid-template-columns: 1.2fr 1fr 1fr;
    gap: 40px;
    margin-top: 56px;
  }

  .page-about .team {
    grid-template-columns: 1.3fr 1fr 1fr;
    gap: 44px;
    margin-top: 56px;
  }

  .page-about .crit {
    margin-top: 56px;
  }
  .page-about .crit li {
    grid-template-columns: 40px 1fr;
    gap: 0 24px;
    padding: 22px 0;
  }

  .page-about .bars {
    margin-top: 64px;
    padding: 40px 48px 44px;
  }
  .page-about .bar { grid-template-columns: 84px 1fr auto; gap: 20px; }

  .page-about .outro { padding-top: 96px; }
  .page-about .outro__links {
    grid-template-columns: repeat(2, 1fr);
    column-gap: 56px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .intro__index a,
  .page-about .outro__links a,
  .page-about .gen__link a {
    transition: none;
  }
}