.page-about {
  --ab-sec-gap: clamp(56px, 8vw, 104px);
  --ab-rail: 216px;
  padding-top: calc(var(--bar-h) + 20px);
  padding-bottom: clamp(56px, 9vw, 112px);
  color: var(--text);
}

.page-about .about-crumbs {
  margin-bottom: 22px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  margin-bottom: var(--ab-sec-gap);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -80px;
  right: -6vw;
  width: min(620px, 78vw);
  height: min(620px, 78vw);
  background: radial-gradient(circle at 34% 34%, rgba(33, 230, 193, .17), rgba(255, 122, 47, .10) 46%, rgba(7, 11, 26, 0) 72%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  align-items: center;
}

.page-about .about-hero-copy h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.4vw, 62px);
  line-height: 1.08;
  letter-spacing: -0.025em;
  color: var(--peak);
}

.page-about .about-hero-copy .lede {
  margin: 0;
  max-width: 56ch;
}

.page-about .about-hero-fig {
  margin: 0;
  position: relative;
  clip-path: polygon(0 7%, 100% 0, 100% 93%, 0 100%);
  background: linear-gradient(150deg, var(--ink-800), var(--ink-900));
}

.page-about .about-hero-fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(1.05) contrast(1.05);
}

.page-about .about-hero-strip {
  position: relative;
  z-index: 1;
  margin-top: clamp(28px, 4vw, 52px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ink-700);
  border: 1px solid var(--ink-700);
}

.page-about .hstat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 20px;
  background: var(--ink-850);
}

.page-about .hstat-num {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3.6vw, 38px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--peak);
}

.page-about .hstat-key {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--text-dim);
  line-height: 1.6;
}

/* ---------- 主体布局 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-rail {
  position: relative;
  border-top: 1px solid var(--ink-700);
  padding-top: 14px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-rail::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail .track-label {
  display: block;
  margin-bottom: 10px;
}

.page-about .about-rail-list {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  white-space: nowrap;
}

.page-about .about-rail-link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 8px 12px;
  border: 1px solid var(--ink-700);
  font-size: 13px;
  color: var(--text);
  text-decoration: none;
  transition: color .25s var(--ease), border-color .25s var(--ease), background-color .25s var(--ease);
}

.page-about .about-rail-link:hover,
.page-about .about-rail-link:focus-visible {
  color: var(--peak);
  border-color: var(--cyan);
  background: rgba(33, 230, 193, .08);
}

.page-about .about-rail-num {
  font-family: var(--font-data);
  font-size: 11px;
  color: var(--orange);
  letter-spacing: .06em;
}

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

/* ---------- 通用章节 ---------- */
.page-about .about-sec {
  padding-bottom: var(--ab-sec-gap);
}

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

.page-about .about-sec-head {
  position: relative;
  padding-left: 16px;
}

.page-about .about-sec-head::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 3px;
  background: linear-gradient(180deg, var(--orange), var(--cyan));
}

.page-about .about-sec-head h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 4vw, 40px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--peak);
}

.page-about .sec-lead {
  margin: 16px 0 26px;
  max-width: 62ch;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.78;
  color: var(--text);
}

.page-about .sec-kicker {
  margin: 26px 0 0;
  padding: 16px 20px;
  border-left: 2px solid var(--cyan);
  background: linear-gradient(90deg, rgba(33, 230, 193, .09), rgba(33, 230, 193, 0));
  font-size: 16px;
  line-height: 1.75;
  color: var(--cyan-soft);
}

/* ---------- 01 服务对象 ---------- */
.page-about .aud-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .aud-card {
  position: relative;
  padding: 22px 22px 24px;
  border: 1px solid var(--ink-700);
  background: linear-gradient(155deg, var(--ink-800) 0%, var(--ink-850) 100%);
  transition: border-color .3s var(--ease), transform .3s var(--ease);
}

.page-about .aud-card::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 46px;
  height: 3px;
  background: var(--home-grad);
  transition: width .35s var(--ease);
}

.page-about .aud-card:hover {
  border-color: rgba(33, 230, 193, .55);
  transform: translateY(-3px);
}

.page-about .aud-card:hover::after {
  width: 100%;
}

.page-about .aud-tag {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-about .aud-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--peak);
}

.page-about .aud-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-dim);
}

/* ---------- 02 数据覆盖 ---------- */
.page-about .scale-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ink-700);
  border: 1px solid var(--ink-700);
  margin-bottom: 26px;
}

.page-about .scale-cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 18px;
  background: var(--ink-850);
}

.page-about .scale-num {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 4.4vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  background: var(--home-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .scale-key {
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--peak);
}

.page-about .scale-note {
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .cover-detail {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-about .cover-block {
  padding: 22px;
  border: 1px solid var(--ink-700);
  background: var(--ink-800);
}

.page-about .cover-block h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--peak);
}

.page-about .cover-block p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .band-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.page-about .band {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--text);
}

.page-about .band i {
  display: block;
  width: 30px;
  height: 8px;
}

.page-about .band-a i {
  background: var(--away-grad);
}

.page-about .band-b i {
  background: var(--home-grad);
}

.page-about .band-c i {
  background: linear-gradient(135deg, #FF4D6D, var(--orange));
}

/* ---------- 03 评测体系 ---------- */
.page-about .method-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

.page-about .method-fig {
  margin: 0;
  padding: 18px 14px 12px;
  border: 1px solid var(--ink-700);
  background: radial-gradient(circle at 50% 42%, rgba(33, 230, 193, .09), rgba(7, 11, 26, 0) 68%), var(--ink-850);
}

.page-about .about-radar {
  display: block;
  width: 100%;
  max-width: 340px;
  height: auto;
  margin: 0 auto;
}

.page-about .radar-grid {
  fill: none;
  stroke: var(--ink-700);
  stroke-width: 1;
}

.page-about .radar-shape {
  fill: url(#aboutRadarFill);
  stroke: var(--cyan);
  stroke-width: 1.5;
}

.page-about .radar-dots circle {
  fill: var(--orange-soft);
}

.page-about .radar-labels text {
  fill: var(--text-dim);
  font-size: 11px;
  font-family: var(--font-data);
  letter-spacing: .06em;
}

.page-about .method-fig .fig-cap {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .dim-rows {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.page-about .dim-head {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 10px;
}

.page-about .dim-name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--peak);
}

.page-about .dim-note {
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .dim-track {
  height: 10px;
  background: var(--ink-800);
  border: 1px solid var(--ink-700);
  overflow: hidden;
}

.page-about .dim-fill {
  display: block;
  height: 100%;
}

.page-about .dim-fill-home {
  width: 92%;
  background: var(--home-grad);
}

.page-about .dim-fill-away {
  width: 74%;
  background: var(--away-grad);
}

.page-about .dim-fill-neutral {
  width: 52%;
  background: linear-gradient(135deg, var(--ink-700), #46567F);
}

.page-about .dim-foot {
  margin: 6px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--ink-700);
  font-size: 14px;
  line-height: 1.8;
  color: var(--text);
}

/* ---------- 04 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .team-card {
  padding: 20px 20px 22px;
  border: 1px solid var(--ink-700);
  background: var(--ink-850);
  border-top: 3px solid var(--cyan);
}

.page-about .team-count {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--orange-soft);
  margin-bottom: 10px;
}

.page-about .team-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--peak);
}

.page-about .team-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .team-fig {
  margin: 22px 0 0;
  border: 1px solid var(--ink-700);
  background: var(--ink-800);
  overflow: hidden;
}

.page-about .team-fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .team-fig .fig-cap {
  display: block;
  padding: 12px 16px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .rhythm-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--ink-700);
  border: 1px solid var(--ink-700);
}

.page-about .rhythm-item {
  background: var(--ink-850);
  padding: 20px;
}

.page-about .rhythm-phase {
  display: block;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--cyan);
  margin-bottom: 10px;
}

.page-about .rhythm-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text);
}

/* ---------- 05 版本演进 ---------- */
.page-about .evo-banner {
  margin: 0 0 26px;
  border: 1px solid var(--ink-700);
  overflow: hidden;
  background: var(--ink-800);
}

.page-about .evo-banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 5;
  object-fit: cover;
  opacity: .82;
}

.page-about .evo-list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .evo-item {
  position: relative;
  padding-left: 22px;
}

.page-about .evo-item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 0;
  bottom: -12px;
  width: 1px;
  background: var(--ink-700);
}

.page-about .evo-item:last-child::before {
  bottom: auto;
  height: 34px;
}

.page-about .evo-item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  width: 11px;
  height: 11px;
  transform: rotate(45deg);
  background: var(--ink-800);
  border: 1px solid var(--orange);
}

.page-about .evo-node {
  border: 1px solid var(--ink-700);
  background: linear-gradient(140deg, var(--ink-800), var(--ink-850));
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
  transition: border-color .3s var(--ease);
}

.page-about .evo-node[open] {
  border-color: rgba(255, 122, 47, .55);
}

.page-about .evo-summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  padding: 18px 22px;
  cursor: pointer;
  list-style: none;
}

.page-about .evo-summary::-webkit-details-marker {
  display: none;
}

.page-about .evo-year {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: 20px;
  font-weight: 700;
  color: var(--orange-soft);
  letter-spacing: -0.01em;
}

.page-about .evo-title {
  flex: 1 1 200px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--peak);
}

.page-about .evo-mark {
  position: relative;
  width: 13px;
  height: 13px;
  flex: none;
  align-self: center;
  border: 1px solid var(--cyan);
}

.page-about .evo-mark::before,
.page-about .evo-mark::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: opacity .25s var(--ease);
}

.page-about .evo-mark::before {
  left: 2px;
  right: 2px;
  top: 5px;
  height: 1px;
}

.page-about .evo-mark::after {
  top: 2px;
  bottom: 2px;
  left: 5px;
  width: 1px;
}

.page-about .evo-node[open] .evo-mark::after {
  opacity: 0;
}

.page-about .evo-body {
  padding: 0 22px 20px;
}

.page-about .evo-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 06 合作与认可 ---------- */
.page-about .eco-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .eco-card {
  position: relative;
  padding: 22px;
  background: var(--ink-850);
  border: 1px solid var(--ink-700);
  border-left: 3px solid var(--orange);
}

.page-about .eco-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--peak);
}

.page-about .eco-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .eco-award {
  margin-top: 22px;
  padding: 22px;
  border: 1px solid var(--ink-700);
  background: linear-gradient(120deg, rgba(33, 230, 193, .12), rgba(255, 122, 47, .10));
}

.page-about .eco-award-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--peak);
}

.page-about .about-cta {
  margin-top: 30px;
  padding: 26px 22px;
  background: var(--ink-850);
  border: 1px solid var(--ink-700);
  border-top: 3px solid var(--cyan);
}

.page-about .about-cta-text {
  margin: 0 0 20px;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--text);
  max-width: 60ch;
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .about-hero-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .rhythm-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .scale-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-inner {
    grid-template-columns: 7fr 5fr;
  }

  .page-about .about-hero-fig {
    clip-path: polygon(0 9%, 100% 0, 100% 91%, 0 100%);
  }

  .page-about .method-grid {
    grid-template-columns: 5fr 7fr;
    gap: 34px;
  }
}

@media (min-width: 980px) {
  .page-about .about-layout {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 68px);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--bar-h) + 28px);
    align-self: start;
    overflow: visible;
    border-top: 0;
    border-left: 1px solid var(--ink-700);
    padding-top: 0;
    padding-left: 16px;
  }

  .page-about .about-rail-list {
    flex-direction: column;
    gap: 2px;
    white-space: normal;
    padding-bottom: 0;
  }

  .page-about .about-rail-link {
    display: flex;
    border-color: transparent;
    padding: 9px 10px;
  }

  .page-about .about-rail-link:hover,
  .page-about .about-rail-link:focus-visible {
    padding-left: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .aud-card,
  .page-about .evo-node,
  .page-about .about-rail-link {
    transition: none;
  }
}
<<<END>>>