.page-about {
  --ab-line: rgba(31, 224, 197, .22);
  --ab-gap: clamp(20px, 4vw, 32px);
  --ab-body-max: 74ch;
  color: var(--text);
  font-family: var(--font-body);
  overflow-x: clip;
  padding-bottom: clamp(48px, 8vw, 96px);
  background:
    radial-gradient(120% 62% at 108% 0%, rgba(58, 46, 122, .40), transparent 62%),
    radial-gradient(85% 48% at -12% 40%, rgba(122, 31, 61, .26), transparent 68%),
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 46%, var(--ink-900) 100%);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding-top: clamp(26px, 6vw, 56px);
  padding-bottom: clamp(26px, 5vw, 48px);
}
.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), rgba(31, 224, 197, .05) 72%, transparent);
  opacity: .55;
}
.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  margin-top: clamp(18px, 3vw, 30px);
}
.page-about .ab-hero__kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--amber);
  text-transform: uppercase;
}
.page-about .ab-hero__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 7vw, 62px);
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--paper);
  max-width: 20ch;
}
.page-about .ab-hero__lead {
  margin: 0 0 24px;
  font-size: clamp(16px, 2.2vw, 18px);
  line-height: 1.78;
  color: var(--text);
  max-width: 52ch;
}
.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 1px;
  border-radius: var(--r-lg);
  background: linear-gradient(140deg, rgba(31, 224, 197, .34), rgba(58, 46, 122, .40) 55%, rgba(122, 31, 61, .34));
}
.page-about .ab-facts__item {
  padding: 16px 14px;
  background: rgba(6, 35, 30, .86);
  border-radius: var(--r-md);
}
.page-about .ab-facts__key {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
}
.page-about .ab-facts__val {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(26px, 6vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}
.page-about .ab-facts__item:nth-child(2) .ab-facts__val { color: var(--shot); }
.page-about .ab-facts__item:nth-child(3) .ab-facts__val { color: var(--amber); }
.page-about .ab-facts__item:nth-child(4) .ab-facts__val { color: var(--paper); }

/* ---------- 布局与索引 ---------- */
.page-about .ab-layout {
  padding-top: clamp(24px, 5vw, 44px);
}
.page-about .ab-toc {
  margin-bottom: clamp(20px, 4vw, 34px);
}
.page-about .ab-toc__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--muted);
  text-transform: uppercase;
}
.page-about .ab-toc__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}
.page-about .ab-toc__list::-webkit-scrollbar { display: none; }
.page-about .ab-toc__item { flex: 0 0 auto; }
.page-about .ab-toc__link {
  display: block;
  padding: 9px 14px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease), background-color var(--t) var(--ease);
}
.page-about .ab-toc__link:hover,
.page-about .ab-toc__link:focus-visible,
.page-about .ab-toc__link[data-active] {
  color: var(--cyan);
  border-color: var(--ab-line);
  background: rgba(31, 224, 197, .08);
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-sec {
  position: relative;
  padding: clamp(28px, 6vw, 52px) 0 clamp(12px, 3vw, 20px);
}
.page-about .ab-sec + .ab-sec { border-top: 1px solid var(--line-soft); }
.page-about .ab-sec__idx {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--amber);
}
.page-about .ab-sec__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 5vw, 38px);
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--paper);
  max-width: 26ch;
}
.page-about .ab-sec__lead {
  margin: 0 0 clamp(20px, 4vw, 32px);
  max-width: var(--ab-body-max);
  font-size: clamp(16px, 2.1vw, 17px);
  line-height: 1.78;
  color: var(--text);
}
.page-about .ab-note {
  margin: 18px 0 0;
  max-width: var(--ab-body-max);
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}
.page-about .ab-note a,
.page-about .ab-rhythm__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(31, 224, 197, .35);
}
.page-about .ab-note a:hover,
.page-about .ab-rhythm__body a:hover { border-bottom-color: var(--cyan); }

/* 珠宝色分区 */
.page-about .ab-sec--wine {
  background: linear-gradient(180deg, rgba(122, 31, 61, .16), transparent 78%);
  border-radius: var(--r-lg);
  padding-left: clamp(14px, 3vw, 28px);
  padding-right: clamp(14px, 3vw, 28px);
}
.page-about .ab-sec--indigo {
  background: linear-gradient(180deg, rgba(58, 46, 122, .22), transparent 78%);
  border-radius: var(--r-lg);
  padding-left: clamp(14px, 3vw, 28px);
  padding-right: clamp(14px, 3vw, 28px);
}

/* ---------- 业务范围列表 ---------- */
.page-about .ab-list {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .ab-list__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--line-soft);
}
.page-about .ab-list__item:last-child { border-bottom: 1px solid var(--line-soft); }
.page-about .ab-list__num {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid var(--ab-line);
  color: var(--cyan);
  font-size: 14px;
  font-weight: 700;
}
.page-about .ab-list__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: clamp(18px, 3.4vw, 22px);
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--paper);
}
.page-about .ab-list__body p {
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--text);
  max-width: var(--ab-body-max);
}

/* ---------- 图片 ---------- */
.page-about .ab-figure {
  margin: clamp(20px, 4vw, 32px) 0 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: rgba(11, 58, 49, .5);
}
.page-about .ab-figure .media__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .ab-figure .media__cap {
  display: block;
  padding: 12px 16px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
  border-top: 1px solid var(--line-soft);
}
.page-about .ab-band {
  margin: clamp(28px, 6vw, 52px) 0 0;
  padding: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid rgba(255, 194, 75, .22);
  position: relative;
}
.page-about .ab-band .media__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .ab-band .media__cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 14px 18px;
  font-size: 13px;
  color: var(--text);
  background: linear-gradient(180deg, transparent, rgba(6, 35, 30, .88));
}

/* ---------- 职责折叠 ---------- */
.page-about .ab-duty {
  margin-top: clamp(20px, 4vw, 30px);
  border-top: 1px solid var(--line-soft);
}
.page-about .ab-duty .disclosure {
  border-bottom: 1px solid var(--line-soft);
}
.page-about .ab-duty .disclosure__trigger {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 16px 2px;
  background: none;
  border: 0;
  color: var(--paper);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 3.4vw, 20px);
  letter-spacing: -.01em;
  text-align: left;
  cursor: pointer;
  transition: color var(--t) var(--ease);
}
.page-about .ab-duty .disclosure__trigger:hover,
.page-about .ab-duty .disclosure__trigger:focus-visible { color: var(--cyan); }
.page-about .ab-duty .ab-duty__name { flex: 1 1 auto; }
.page-about .ab-duty .disclosure__icon {
  position: relative;
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
  margin-left: auto;
  border: 1px solid var(--ab-line);
  border-radius: 50%;
}
.page-about .ab-duty .disclosure__icon::before,
.page-about .ab-duty .disclosure__icon::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  border-radius: 1px;
  transition: transform var(--t) var(--ease);
}
.page-about .ab-duty .disclosure__icon::before { left: 4px; right: 4px; top: 7px; height: 1.5px; }
.page-about .ab-duty .disclosure__icon::after { top: 4px; bottom: 4px; left: 7px; width: 1.5px; }
.page-about .ab-duty .disclosure[data-open] .disclosure__icon::after { transform: scaleY(0); }
.page-about .ab-duty .disclosure__panel p {
  margin: 0 0 18px;
  padding-right: clamp(0px, 6vw, 60px);
  font-size: 16px;
  line-height: 1.78;
  color: var(--text);
  max-width: var(--ab-body-max);
}

/* ---------- 时间线 ---------- */
.page-about .ab-tl {
  margin: 0;
  padding: 0 0 0 22px;
  list-style: none;
  border-left: 1px solid var(--ab-line);
}
.page-about .ab-tl__item {
  position: relative;
  display: grid;
  gap: 10px;
  padding: 4px 0 clamp(22px, 4vw, 34px);
}
.page-about .ab-tl__item:last-child { padding-bottom: 4px; }
.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 12px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(31, 224, 197, .13);
}
.page-about .ab-tl__mark {
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.page-about .ab-tl__code {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: .04em;
}
.page-about .ab-tl__phase {
  font-size: 13px;
  color: var(--muted);
  letter-spacing: .06em;
}
.page-about .ab-tl__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: clamp(19px, 3.6vw, 24px);
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--paper);
}
.page-about .ab-tl__body p {
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--text);
  max-width: var(--ab-body-max);
}
.page-about .ab-tl__item:nth-child(2) .ab-tl__code { color: var(--shot); }
.page-about .ab-tl__item:nth-child(2)::before { background: var(--shot); box-shadow: 0 0 0 4px rgba(255, 90, 43, .14); }
.page-about .ab-tl__item:nth-child(3) .ab-tl__code { color: var(--amber); }
.page-about .ab-tl__item:nth-child(3)::before { background: var(--amber); box-shadow: 0 0 0 4px rgba(255, 194, 75, .14); }

/* ---------- 运营节奏 ---------- */
.page-about .ab-rhythm {
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border-radius: var(--r-md);
  overflow: hidden;
}
.page-about .ab-rhythm__row {
  display: grid;
  gap: 8px;
  padding: clamp(16px, 3vw, 22px);
  background: rgba(11, 58, 49, .66);
}
.page-about .ab-rhythm__time {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--amber);
}
.page-about .ab-rhythm__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: clamp(18px, 3.4vw, 22px);
  font-weight: 700;
  color: var(--paper);
  letter-spacing: -.01em;
}
.page-about .ab-rhythm__body p {
  margin: 0;
  font-size: 16px;
  line-height: 1.76;
  color: var(--text);
  max-width: var(--ab-body-max);
}

/* ---------- 会员三档 ---------- */
.page-about .ab-tiers {
  display: grid;
  gap: clamp(14px, 3vw, 22px);
}
.page-about .ab-tier {
  padding: clamp(18px, 3.4vw, 26px);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: rgba(6, 35, 30, .52);
  border-left: 3px solid var(--cyan);
}
.page-about .ab-tier--pro {
  border-left-color: var(--amber);
  background: rgba(58, 46, 122, .38);
}
.page-about .ab-tier__idx {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--muted);
}
.page-about .ab-tier__name {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(20px, 3.8vw, 26px);
  font-weight: 800;
  color: var(--paper);
  letter-spacing: -.01em;
}
.page-about .ab-tier__for {
  margin: 0 0 8px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--text);
}
.page-about .ab-tier__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 合作与表现 ---------- */
.page-about .ab-eco__grid {
  display: grid;
  gap: clamp(22px, 4vw, 36px);
}
.page-about .ab-eco__sub {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(18px, 3.4vw, 22px);
  font-weight: 700;
  color: var(--paper);
  letter-spacing: -.01em;
}
.page-about .ab-eco__list {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .ab-eco__list li {
  position: relative;
  padding: 12px 0 12px 18px;
  border-bottom: 1px solid var(--line-soft);
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--text);
}
.page-about .ab-eco__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--shot);
  transform: rotate(45deg);
}
.page-about .ab-eco__list strong {
  color: var(--paper);
  font-weight: 700;
}

.page-about .ab-chart {
  display: flex;
  align-items: flex-end;
  gap: clamp(18px, 5vw, 44px);
  padding: 20px 18px 14px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: rgba(6, 35, 30, .5);
  background-image: linear-gradient(rgba(31, 224, 197, .08) 1px, transparent 1px);
  background-size: 100% 42px;
}
.page-about .ab-chart__col {
  display: grid;
  grid-template-rows: auto auto auto;
  justify-items: center;
  align-content: end;
  gap: 8px;
  flex: 1 1 0;
  min-width: 0;
}
.page-about .ab-chart__val {
  font-family: var(--font-mono);
  font-size: clamp(15px, 3.6vw, 20px);
  font-weight: 700;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}
.page-about .ab-chart__bar {
  width: min(56px, 100%);
  border-radius: 8px 8px 2px 2px;
  background: linear-gradient(180deg, var(--cyan), rgba(31, 224, 197, .18));
}
.page-about .ab-chart__bar--a { height: 78px; }
.page-about .ab-chart__bar--b { height: 118px; background: linear-gradient(180deg, var(--shot), rgba(255, 90, 43, .18)); }
.page-about .ab-chart__bar--c { height: 94px; background: linear-gradient(180deg, var(--amber), rgba(255, 194, 75, .18)); }
.page-about .ab-chart__cap {
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
}

/* ---------- 下一步 ---------- */
.page-about .ab-next {
  margin-top: clamp(34px, 7vw, 62px);
  padding: clamp(22px, 4vw, 34px) 0 0;
  border-top: 1px solid var(--ab-line);
}
.page-about .ab-next__title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-size: clamp(22px, 4.4vw, 30px);
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--paper);
}
.page-about .ab-next__links {
  display: grid;
  gap: 12px;
}
.page-about .ab-next__link {
  display: block;
  padding: 18px 20px;
  border-radius: var(--r-md);
  text-decoration: none;
  background: rgba(11, 58, 49, .62);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--cyan);
  transition: transform var(--t) var(--ease), background-color var(--t) var(--ease);
}
.page-about .ab-next__link:hover,
.page-about .ab-next__link:focus-visible {
  transform: translateX(4px);
  background: rgba(11, 58, 49, .92);
}
.page-about .ab-next__link--shot { border-left-color: var(--shot); }
.page-about .ab-next__link--amber { border-left-color: var(--amber); }
.page-about .ab-next__k {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--paper);
}
.page-about .ab-next__d {
  display: block;
  font-size: 14px;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-facts { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .page-about .ab-rhythm__row {
    grid-template-columns: minmax(120px, 160px) minmax(0, 1fr);
    gap: 20px;
    align-items: start;
  }
  .page-about .ab-next__links { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: 48px;
  }
  .page-about .ab-tl__item { grid-template-columns: 132px minmax(0, 1fr); gap: 26px; }
  .page-about .ab-tl__mark { flex-direction: column; align-items: flex-start; gap: 4px; }
  .page-about .ab-tiers { grid-template-columns: minmax(0, 5fr) minmax(0, 6fr) minmax(0, 6fr); align-items: start; }
  .page-about .ab-tier--pro { margin-top: 22px; }
  .page-about .ab-eco__grid { grid-template-columns: minmax(0, 6fr) minmax(0, 6fr); }
}

@media (min-width: 1040px) {
  .page-about .ab-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 210px;
    gap: 56px;
    align-items: start;
  }
  .page-about .ab-toc {
    order: 2;
    position: sticky;
    top: 96px;
    margin-bottom: 0;
    padding-left: 20px;
    border-left: 1px solid var(--line-soft);
  }
  .page-about .ab-toc__list {
    flex-direction: column;
    overflow: visible;
    gap: 4px;
    padding-bottom: 0;
  }
  .page-about .ab-toc__link {
    padding: 8px 10px;
    border-radius: var(--r-sm);
    border-color: transparent;
    border-left: 2px solid transparent;
  }
  .page-about .ab-toc__link[data-active] {
    border-color: transparent;
    border-left-color: var(--cyan);
    border-radius: 0 var(--r-sm) var(--r-sm) 0;
    background: rgba(31, 224, 197, .07);
  }
  .page-about .ab-body { order: 1; min-width: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-next__link,
  .page-about .ab-toc__link,
  .page-about .ab-duty .disclosure__icon::before,
  .page-about .ab-duty .disclosure__icon::after { transition: none; }
  .page-about .ab-next__link:hover { transform: none; }
}
</style>
<<<END>>>
</main>