.page-about {
  --ab-gap: clamp(22px, 4vw, 42px);
  --ab-cut: 18px;
  --ab-line: rgba(37, 224, 208, .38);
  --ab-line-dark: rgba(201, 203, 218, .2);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding-top: clamp(28px, 5vw, 56px);
}
.page-about .ab-hero::after {
  content: "";
  position: absolute;
  right: -8%;
  top: 12%;
  width: 46%;
  height: 70%;
  background: radial-gradient(60% 60% at 60% 40%, rgba(37, 224, 208, .16), transparent 72%),
              radial-gradient(50% 50% at 30% 80%, rgba(242, 180, 65, .12), transparent 70%);
  pointer-events: none;
}
.page-about .ab-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(28px, 5vw, 52px);
  align-items: center;
}
.page-about .ab-hero h1 {
  font-family: var(--tt-font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.4vw, 56px);
  line-height: 1.18;
  letter-spacing: -.01em;
  color: var(--tt-night);
  margin: 14px 0 18px;
}
.page-about .ab-hero__copy .tt-lead {
  max-width: 42ch;
  color: var(--tt-stone);
}
.page-about .ab-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 26px;
}
.page-about .ab-hero__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-hero__visual {
  position: relative;
  min-height: 280px;
  padding: 26px 24px 22px;
  background:
    radial-gradient(120% 90% at 88% 6%, rgba(75, 46, 131, .85), transparent 62%),
    linear-gradient(160deg, var(--tt-night), #2b1f4d 62%, #241a45);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--tt-cut-lg)), calc(100% - var(--tt-cut-lg)) 100%, 0 100%);
  box-shadow: var(--tt-shadow);
  overflow: hidden;
}
.page-about .ab-hero__ruler {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 6px;
  background: repeating-linear-gradient(90deg, var(--tt-neon) 0 2px, transparent 2px 14px);
  opacity: .55;
}
.page-about .ab-hero__svg {
  display: block;
  width: 100%;
  height: auto;
}
.page-about .ab-hero__stamp {
  position: absolute;
  right: 22px;
  top: 26px;
  text-align: right;
}
.page-about .ab-hero__stampnum {
  display: block;
  font-family: var(--tt-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(38px, 8vw, 62px);
  font-weight: 900;
  line-height: 1;
  color: var(--tt-gold);
  -webkit-text-stroke: 1px rgba(27, 19, 48, .45);
  text-shadow: 0 0 22px rgba(242, 180, 65, .45);
}
.page-about .ab-hero__stamptext {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--tt-silver);
}
.page-about .ab-hero__caption {
  margin-top: 14px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--tt-silver);
  border-left: 2px solid var(--tt-coral);
  padding-left: 12px;
}

/* ---------- 章节头部 ---------- */
.page-about .ab-head {
  max-width: 720px;
  margin-bottom: clamp(26px, 4vw, 44px);
}
.page-about .ab-head h2 {
  font-family: var(--tt-font-display);
  font-weight: 900;
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.24;
  margin: 12px 0 14px;
  color: var(--tt-night);
}
.page-about .ab-head p {
  margin: 0;
  font-size: 17px;
  line-height: 1.8;
  color: var(--tt-stone);
  max-width: 40ch;
}
.page-about .ab-head--dark h2 { color: var(--tt-cream); }
.page-about .ab-head--dark p { color: var(--tt-silver); }

/* ---------- 版本里程碑 ---------- */
.page-about .ab-miles {
  position: relative;
  overflow: hidden;
}
.page-about .ab-miles::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(201, 203, 218, .16) 1px, transparent 1px);
  background-size: 26px 26px;
  opacity: .5;
  pointer-events: none;
}
.page-about .ab-miles > .tt-shell { position: relative; z-index: 1; }

.page-about .ab-miles__fig {
  margin: 0 0 clamp(30px, 5vw, 52px);
}
.page-about .ab-miles__fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(1.06) contrast(1.02);
}

.page-about .ab-miles__body {
  display: grid;
  gap: clamp(24px, 4vw, 46px);
}

.page-about .ab-index ol {
  list-style: none;
  margin: 0;
  padding: 0 0 8px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}
.page-about .ab-index a {
  display: block;
  white-space: nowrap;
  padding: 7px 12px;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--tt-silver);
  border: 1px solid var(--tt-rule-dark);
  border-radius: 999px;
  text-decoration: none;
  transition: color .2s var(--tt-ease), border-color .2s var(--tt-ease), background-color .2s var(--tt-ease);
}
.page-about .ab-index a:hover,
.page-about .ab-index a:focus-visible {
  color: var(--tt-night);
  background: var(--tt-neon);
  border-color: var(--tt-neon);
  outline: none;
}
.page-about .ab-index a:focus-visible {
  box-shadow: 0 0 0 3px rgba(37, 224, 208, .35);
}

.page-about .ab-rail {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}
.page-about .ab-rail::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 22px;
  width: 2px;
  background: linear-gradient(180deg, var(--tt-neon), var(--tt-purple) 58%, rgba(75, 46, 131, 0));
  opacity: .7;
}
.page-about .ab-mm {
  position: relative;
  padding: 0 0 clamp(26px, 4vw, 38px) 34px;
  border-bottom: 1px dashed var(--tt-rule-dark);
  margin-bottom: clamp(20px, 3vw, 30px);
}
.page-about .ab-mm:last-child {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}
.page-about .ab-mm::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--tt-night);
  border: 2px solid var(--tt-neon);
  box-shadow: 0 0 0 4px rgba(37, 224, 208, .1);
  transition: border-color .25s var(--tt-ease), box-shadow .25s var(--tt-ease);
}
.page-about .ab-mm:hover::before {
  border-color: var(--tt-gold);
  box-shadow: 0 0 0 6px rgba(242, 180, 65, .16);
}
.page-about .ab-mm__ver {
  margin: 0 0 6px;
  font-family: var(--tt-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--tt-gold);
  text-transform: uppercase;
}
.page-about .ab-mm h3 {
  font-family: var(--tt-font-display);
  font-weight: 900;
  font-size: clamp(19px, 2.6vw, 24px);
  line-height: 1.4;
  margin: 0 0 8px;
  color: var(--tt-cream);
}
.page-about .ab-mm__text {
  margin: 0 0 12px;
  max-width: 52ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--tt-silver);
}
.page-about .ab-mm .tt-chip {
  display: inline-block;
  font-size: 12px;
  letter-spacing: .1em;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--tt-rule-dark);
  color: var(--tt-silver);
}

/* ---------- 团队与分工 ---------- */
.page-about .ab-team__grid { align-items: start; }
.page-about .ab-team__fig {
  margin: 0;
}
.page-about .ab-team__fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .ab-team__list {
  display: grid;
  gap: 14px;
}
.page-about .ab-role {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "no cat"
    "title title"
    "text text";
  align-items: center;
  gap: 4px 12px;
}
.page-about .ab-role .tt-placard__no { grid-area: no; }
.page-about .ab-role .tt-placard__cat { grid-area: cat; }
.page-about .ab-role .tt-placard__title {
  grid-area: title;
  margin: 8px 0 6px;
}
.page-about .ab-role .tt-placard__text { grid-area: text; margin: 0; }

/* ---------- 内容分区 ---------- */
.page-about .ab-zones__grid { align-items: start; }
.page-about .ab-zones__fig {
  margin: 0 0 18px;
}
.page-about .ab-zones__fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .ab-zones__cadence {
  display: grid;
  gap: 10px;
}
.page-about .ab-cadence {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: var(--tt-cream);
  border-left: 4px solid var(--tt-neon);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
}
.page-about .ab-cadence__num {
  flex: 0 0 auto;
  font-family: var(--tt-font-display);
  font-weight: 900;
  font-size: 22px;
  line-height: 1;
  color: var(--tt-purple);
}
.page-about .ab-cadence__txt {
  font-size: 15px;
  line-height: 1.6;
  color: var(--tt-stone);
}

.page-about .ab-zone-list {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}
.page-about .ab-zone-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  background: rgba(246, 241, 231, .82);
  border: 1px solid var(--tt-rule);
  border-radius: 10px;
  font-size: 15px;
  color: var(--tt-stone);
  transition: transform .22s var(--tt-ease), border-color .22s var(--tt-ease), background-color .22s var(--tt-ease);
}
.page-about .ab-zone-list li:hover {
  transform: translateY(-2px) rotate(-.6deg);
  border-color: var(--tt-neon);
  background: var(--tt-cream);
}
.page-about .ab-zone-list__no {
  font-family: var(--tt-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--tt-clay);
}
.page-about .ab-zones__note {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--tt-stone);
}

/* ---------- 服务半径 ---------- */
.page-about .ab-reach {
  position: relative;
  overflow: hidden;
}
.page-about .ab-reach::after {
  content: "";
  position: absolute;
  left: -10%;
  bottom: -30%;
  width: 60%;
  height: 80%;
  background: radial-gradient(50% 50% at 50% 50%, rgba(255, 107, 87, .18), transparent 70%);
  pointer-events: none;
}
.page-about .ab-reach > .tt-shell { position: relative; z-index: 1; }

.page-about .ab-stats {
  list-style: none;
  margin: 0 0 clamp(26px, 4vw, 42px);
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.page-about .ab-stat {
  padding: 18px 16px;
  background: rgba(27, 19, 48, .5);
  border: 1px solid var(--tt-rule-dark);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--ab-cut)), calc(100% - var(--ab-cut)) 100%, 0 100%);
}
.page-about .ab-stat__num {
  display: block;
  font-family: var(--tt-font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 900;
  font-size: clamp(26px, 5.4vw, 42px);
  line-height: 1.05;
  color: var(--tt-gold);
  -webkit-text-stroke: .6px rgba(27, 19, 48, .4);
}
.page-about .ab-stat__unit {
  font-size: .58em;
  margin-left: 2px;
  color: var(--tt-neon);
  -webkit-text-stroke: 0;
}
.page-about .ab-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--tt-silver);
}

.page-about .ab-reach__grid { align-items: stretch; }
.page-about .ab-scene {
  padding: 20px 18px;
  background: rgba(246, 241, 231, .94);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--ab-cut)), calc(100% - var(--ab-cut)) 100%, 0 100%);
  border-top: 3px solid var(--tt-neon);
}
.page-about .ab-scene h3 {
  font-family: var(--tt-font-display);
  font-weight: 900;
  font-size: 19px;
  line-height: 1.4;
  margin: 10px 0 8px;
  color: var(--tt-night);
}
.page-about .ab-scene p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--tt-stone);
}
.page-about .ab-reach__trail {
  margin: clamp(22px, 3vw, 32px) 0 0;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--tt-silver);
}
.page-about .ab-reach__trail .tt-trail {
  flex: 1 1 auto;
  min-width: 40px;
  height: 2px;
  background: repeating-linear-gradient(90deg, var(--tt-neon) 0 8px, transparent 8px 16px);
}

/* ---------- 会员服务 ---------- */
.page-about .ab-member__copy h2 {
  font-family: var(--tt-font-display);
  font-weight: 900;
  font-size: clamp(24px, 4.4vw, 38px);
  line-height: 1.26;
  color: var(--tt-night);
  margin: 12px 0 16px;
}
.page-about .ab-member__copy .tt-prose { color: var(--tt-stone); }
.page-about .ab-member__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}
.page-about .ab-member__panel {
  display: grid;
  gap: 14px;
  align-content: start;
}
.page-about .ab-member__card {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "no cat"
    "title title"
    "text text";
  align-items: center;
  gap: 4px 12px;
}
.page-about .ab-member__card .tt-placard__no { grid-area: no; }
.page-about .ab-member__card .tt-placard__cat { grid-area: cat; }
.page-about .ab-member__card .tt-placard__title {
  grid-area: title;
  margin: 8px 0 6px;
}
.page-about .ab-member__card .tt-placard__text { grid-area: text; margin: 0; }

/* ---------- 资质与联络 ---------- */
.page-about .ab-here {
  position: relative;
}
.page-about .ab-here__grid { align-items: start; }

.page-about .ab-facts {
  margin: 0;
  border-top: 1px solid var(--tt-rule-dark);
}
.page-about .ab-facts__row {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--tt-rule-dark);
}
.page-about .ab-facts dt {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--tt-neon);
}
.page-about .ab-facts dd {
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--tt-cream);
}
.page-about .ab-here__note {
  margin: 18px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--tt-silver);
  max-width: 46ch;
}

.page-about .ab-here__contact {
  display: grid;
  gap: 14px;
  align-content: start;
}
.page-about .ab-contactline {
  display: grid;
  gap: 8px;
  padding: 18px;
  background: rgba(75, 46, 131, .42);
  border: 1px solid var(--tt-rule-dark);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--ab-cut)), calc(100% - var(--ab-cut)) 100%, 0 100%);
}
.page-about .ab-contactline__k {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--tt-silver);
}
.page-about .ab-contactline__v {
  font-family: var(--tt-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(16px, 2.4vw, 20px);
  line-height: 1.4;
  color: var(--tt-gold);
  word-break: break-word;
}
.page-about .ab-contactline .tt-btn {
  justify-self: start;
}
.page-about .ab-here__goto {
  justify-self: start;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .ab-zone-list { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .ab-stats { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .page-about .ab-facts__row {
    grid-template-columns: 140px 1fr;
    align-items: baseline;
    gap: 16px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid { grid-template-columns: 1.12fr .88fr; }
  .page-about .ab-hero__visual { min-height: 360px; padding: 34px 30px 28px; }
  .page-about .ab-miles__body { grid-template-columns: 168px minmax(0, 1fr); }
  .page-about .ab-index { position: sticky; top: 104px; align-self: start; }
  .page-about .ab-index ol {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-about .ab-index a { white-space: normal; }
  .page-about .ab-mm__text { font-size: 17px; }
  .page-about .ab-zones__intro { position: sticky; top: 104px; align-self: start; }
}

@media (min-width: 1100px) {
  .page-about .ab-zone-list { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-zone-list li,
  .page-about .ab-mm::before,
  .page-about .ab-index a {
    transition: none;
  }
  .page-about .ab-zone-list li:hover { transform: none; }
}
<<<END>>>