.page-about {
  --ab-axis: 44px;
  --ab-gap: 18px;
  --ab-glow: rgba(108, 59, 255, 0.30);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  background-image:
    radial-gradient(58% 84% at 84% 0%, rgba(108, 59, 255, 0.30), transparent 68%),
    radial-gradient(42% 64% at 2% 4%, rgba(53, 242, 208, 0.10), transparent 72%);
  background-repeat: no-repeat;
  padding-top: clamp(20px, 3vw, 34px);
  padding-bottom: clamp(40px, 7vw, 80px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  margin-top: clamp(24px, 4vw, 44px);
}

.page-about .about-hero__title {
  font-size: clamp(34px, 6vw, 56px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 14px 0 0;
  transform: rotate(-0.8deg);
  transform-origin: left center;
}

.page-about .hl {
  color: var(--cyan);
  text-shadow: 0 0 32px rgba(53, 242, 208, 0.42);
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 46ch;
  font-size: 17px;
  line-height: 1.8;
  color: var(--paper);
  opacity: 0.86;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__visual {
  position: relative;
}

.page-about .about-hero__panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 18px;
  padding: 20px 22px;
  border-radius: var(--r-lg);
  background: var(--ink-700);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-lift);
}

.page-about .stat__value {
  display: block;
  font-size: 30px;
  line-height: 1.1;
  color: var(--paper);
}

.page-about .stat__value .unit {
  font-size: 14px;
  margin-left: 6px;
  color: var(--cyan);
}

.page-about .stat__label {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--grey);
}

/* ============ 时间轴 ============ */
.page-about .stage-tabs .tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: clamp(24px, 3vw, 36px);
}

.page-about .tl {
  display: grid;
  gap: clamp(26px, 3.4vw, 40px);
}

.page-about .tl-item {
  display: grid;
  grid-template-columns: var(--ab-axis) minmax(0, 1fr);
  gap: var(--ab-gap);
}

.page-about .tl-item__dot {
  position: relative;
  display: flex;
  justify-content: center;
}

.page-about .tl-item__dot::before {
  content: "";
  position: absolute;
  top: 22px;
  bottom: calc(-1 * clamp(26px, 3.4vw, 40px));
  left: 50%;
  width: 2px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, var(--cyan), rgba(53, 242, 208, 0));
}

.page-about .tl-item:last-child .tl-item__dot::before {
  display: none;
}

.page-about .tl-item__marker {
  width: 14px;
  height: 14px;
  margin-top: 8px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 5px rgba(53, 242, 208, 0.14);
}

.page-about .tl-item__year {
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .tl-item__body h3 {
  margin: 8px 0 10px;
  font-size: 22px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .tl-item__body p {
  margin: 0 0 12px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--grey);
  max-width: 64ch;
}

.page-about .tl-item__body p:last-child {
  margin-bottom: 0;
}

.page-about .tl-item .v-note {
  display: none;
}

/* ============ 服务对象 ============ */
.page-about .serve-list {
  display: grid;
  gap: 12px;
}

.page-about .acc {
  border-radius: var(--r-lg);
  background: var(--ink-700);
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .acc__trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 22px;
  font-size: 18px;
  font-weight: 700;
  color: var(--paper);
  background: none;
  border: 0;
  text-align: left;
  cursor: pointer;
}

.page-about .acc__trigger:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -3px;
}

.page-about .acc__trigger[aria-expanded="true"] {
  color: var(--cyan);
}

.page-about .acc__icon {
  position: relative;
  flex: 0 0 18px;
  width: 18px;
  height: 18px;
}

.page-about .acc__icon::before,
.page-about .acc__icon::after {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--violet-soft);
  transform: translateY(-50%);
  transition: transform 0.18s var(--ease), opacity 0.18s var(--ease);
}

.page-about .acc__icon::after {
  transform: translateY(-50%) rotate(90deg);
}

.page-about .acc__trigger[aria-expanded="true"] .acc__icon::after {
  transform: translateY(-50%) rotate(0deg);
  opacity: 0;
}

.page-about .acc__panel {
  padding: 0 22px 22px;
}

.page-about .acc__panel p {
  margin: 0 0 12px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--grey);
  max-width: 64ch;
}

.page-about .acc__panel p:last-child {
  margin-bottom: 0;
}

/* ============ 团队 ============ */
.page-about .team-grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .team-figure {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
}

.page-about .ring-wrap {
  position: relative;
  width: 190px;
  height: 190px;
}

.page-about .ring {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: conic-gradient(
    var(--violet) 0deg 120deg,
    var(--cyan) 120deg 240deg,
    var(--orange) 240deg 360deg
  );
  -webkit-mask: radial-gradient(circle at center, transparent 53%, #000 54%);
  mask: radial-gradient(circle at center, transparent 53%, #000 54%);
}

.page-about .ring-center {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
}

.page-about .ring-num {
  font-size: 40px;
  line-height: 1;
  color: var(--paper);
}

.page-about .ring-cap {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--grey);
}

.page-about .ring-legend {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px 20px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 14px;
  color: var(--grey);
}

.page-about .ring-legend li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about .legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}

.page-about .legend-dot--violet { background: var(--violet); }
.page-about .legend-dot--cyan { background: var(--cyan); }
.page-about .legend-dot--orange { background: var(--orange); }

.page-about .team-roles {
  display: grid;
  gap: 14px;
}

.page-about .role-card {
  padding: 22px;
  border-radius: var(--r-lg);
  background: var(--ink-800);
  border-left: 3px solid var(--cyan);
}

.page-about .role-card h3 {
  margin: 0 0 10px;
  font-size: 20px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .role-card p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--grey);
}

.page-about .team-photo {
  margin: clamp(28px, 4vw, 48px) 0 0;
}

/* ============ 节奏 ============ */
.page-about .pulse {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: pulse;
}

.page-about .pulse__item {
  position: relative;
  padding: 24px 22px 22px;
  border-radius: var(--r-lg);
  background: var(--ink-700);
  border: 1px solid var(--line-soft);
}

.page-about .pulse__tag {
  display: inline-block;
  padding: 5px 12px;
  border-radius: var(--r-pill);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink-950);
  background: var(--cyan);
}

.page-about .pulse__item:nth-child(2) .pulse__tag {
  background: var(--violet-soft);
  color: var(--ink-950);
}

.page-about .pulse__item:nth-child(3) .pulse__tag {
  background: var(--amber);
}

.page-about .pulse__item:nth-child(4) .pulse__tag {
  background: var(--orange);
}

.page-about .pulse__item h3 {
  margin: 14px 0 8px;
  font-size: 20px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .pulse__item p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--grey);
}

/* ============ 合作生态 ============ */
.page-about .partners-grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .partners-copy p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--grey);
  max-width: 60ch;
}

.page-about .partners-count {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  margin-top: 22px;
  padding: 20px 22px;
  border-radius: var(--r-lg);
  background: var(--ink-700);
  border: 1px solid var(--line);
}

.page-about .partners-count .stat__value {
  font-size: 32px;
  color: var(--cyan);
}

.page-about .partners-count .stat__value .unit {
  font-size: 14px;
  color: var(--grey);
}

.page-about .partners-count__sep {
  font-size: 22px;
  color: var(--violet-soft);
}

.page-about .partners-count .stat__label {
  flex: 1 1 100%;
  margin-top: 0;
}

.page-about .partners-map__legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 18px;
  margin: 0 0 18px;
  font-size: 14px;
  color: var(--grey);
}

.page-about .partners-map__legend .legend-dot {
  margin-right: 6px;
}

.page-about .dots {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
}

.page-about .dot {
  position: relative;
  display: block;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  cursor: default;
  transition: transform 0.18s var(--ease);
}

.page-about .dot--venue {
  background: radial-gradient(circle at 32% 30%, var(--violet-soft), var(--violet) 62%);
}

.page-about .dot--league {
  background: radial-gradient(circle at 32% 30%, var(--amber), var(--orange) 64%);
}

.page-about .dot:hover,
.page-about .dot:focus-visible {
  transform: scale(1.22);
  outline: none;
}

.page-about .dot:focus-visible {
  box-shadow: 0 0 0 3px var(--cyan);
}

.page-about .dot::after {
  content: attr(data-tip);
  position: absolute;
  top: calc(100% + 10px);
  left: 50%;
  z-index: 6;
  width: max-content;
  max-width: min(190px, 46vw);
  padding: 8px 12px;
  border-radius: var(--r-md);
  background: var(--ink-950);
  border: 1px solid var(--line);
  color: var(--paper);
  font-size: 13px;
  line-height: 1.45;
  text-align: center;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 6px);
  transition: opacity 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .dot:hover::after,
.page-about .dot:focus-visible::after {
  opacity: 1;
  transform: translate(-50%, 0);
}

.page-about .dot:nth-child(5n + 1)::after {
  left: 0;
  transform: translate(0, 6px);
}

.page-about .dot:nth-child(5n + 1):hover::after,
.page-about .dot:nth-child(5n + 1):focus-visible::after {
  transform: translate(0, 0);
}

.page-about .dot:nth-child(5n)::after {
  left: auto;
  right: 0;
  transform: translate(0, 6px);
}

.page-about .dot:nth-child(5n):hover::after,
.page-about .dot:nth-child(5n):focus-visible::after {
  transform: translate(0, 0);
}

.page-about .partner-photo {
  margin: clamp(28px, 4vw, 48px) 0 0;
  max-width: 720px;
}

/* ============ 规模 ============ */
.page-about .scale-grid {
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border-radius: var(--r-xl);
  overflow: hidden;
}

.page-about .scale-cell {
  padding: 26px 22px;
  background: var(--ink-950);
}

.page-about .scale-num {
  display: block;
  font-size: 40px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .scale-unit {
  display: block;
  margin-top: 10px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .scale-cell p {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--grey);
}

/* ============ 里程碑 ============ */
.page-about .milestone-grid {
  align-items: stretch;
}

.page-about .milestone {
  padding: 28px 24px;
  border-radius: var(--r-xl);
  background: linear-gradient(160deg, rgba(108, 59, 255, 0.22), rgba(11, 18, 48, 0.9) 62%);
  border: 1px solid var(--line);
}

.page-about .milestone__tag {
  display: inline-block;
  padding: 5px 12px;
  border-radius: var(--r-pill);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  background: rgba(53, 242, 208, 0.12);
  border: 1px solid rgba(53, 242, 208, 0.35);
}

.page-about .milestone__tag--amber {
  color: var(--amber);
  background: rgba(255, 209, 102, 0.12);
  border-color: rgba(255, 209, 102, 0.35);
}

.page-about .milestone h3 {
  margin: 16px 0 12px;
  font-size: 22px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .milestone p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--grey);
}

.page-about .milestone__link {
  color: var(--violet-soft);
  font-size: 15px;
  text-decoration: none;
  border-bottom: 1px solid rgba(167, 139, 255, 0.45);
  padding-bottom: 2px;
  transition: color 0.18s var(--ease);
}

.page-about .milestone__link:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .light-band {
  margin-top: clamp(32px, 5vw, 56px);
}

.page-about .light-band__ticks {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px;
  font-size: 13px;
  color: var(--grey);
}

/* ============ 下一步 ============ */
.page-about .next-grid {
  display: grid;
  gap: 26px;
}

.page-about .next-grid .prose {
  margin: 14px 0 0;
  font-size: 17px;
  line-height: 1.8;
  color: var(--grey);
}

.page-about .next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

/* ============ 响应式 ============ */
@media (min-width: 640px) {
  .page-about .pulse {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .scale-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .dots {
    grid-template-columns: repeat(10, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .dot:nth-child(5n + 1)::after { left: 50%; transform: translate(-50%, 6px); }
  .page-about .dot:nth-child(5n + 1):hover::after,
  .page-about .dot:nth-child(5n + 1):focus-visible::after { transform: translate(-50%, 0); }
  .page-about .dot:nth-child(5n)::after { left: 50%; right: auto; transform: translate(-50%, 6px); }
  .page-about .dot:nth-child(5n):hover::after,
  .page-about .dot:nth-child(5n):focus-visible::after { transform: translate(-50%, 0); }

  .page-about .dot:nth-child(10n + 1)::after { left: 0; transform: translate(0, 6px); }
  .page-about .dot:nth-child(10n + 1):hover::after,
  .page-about .dot:nth-child(10n + 1):focus-visible::after { transform: translate(0, 0); }
  .page-about .dot:nth-child(10n)::after { left: auto; right: 0; transform: translate(0, 6px); }
  .page-about .dot:nth-child(10n):hover::after,
  .page-about .dot:nth-child(10n):focus-visible::after { transform: translate(0, 0); }
}

@media (min-width: 900px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    align-items: start;
  }

  .page-about .team-figure {
    align-items: flex-start;
    position: sticky;
    top: 96px;
  }

  .page-about .ring-legend {
    justify-content: flex-start;
    flex-direction: column;
    gap: 12px;
  }

  .page-about .partners-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .scale-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .next-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }

  .page-about .next-actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1000px) {
  .page-about {
    --ab-axis: 88px;
    --ab-gap: 28px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: end;
  }

  .page-about .about-hero__panel {
    position: absolute;
    left: -32px;
    bottom: -30px;
    width: min(360px, 74%);
    margin-top: 0;
    background: rgba(31, 42, 94, 0.93);
    backdrop-filter: blur(10px);
  }

  .page-about .tl-item {
    grid-template-columns: var(--ab-axis) minmax(0, 1fr) 72px;
  }

  .page-about .tl-item .v-note {
    display: block;
    align-self: start;
    margin-top: 10px;
    font-size: 12px;
    letter-spacing: 0.14em;
    color: var(--grey);
    writing-mode: vertical-rl;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  }
}

@media (min-width: 1200px) {
  .page-about .pulse {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}
<<<END>>>