.page-about {
  --ab-line: rgba(168, 184, 212, .2);
  --ab-line-soft: rgba(168, 184, 212, .1);
  --ab-radius: 6px;
  display: block;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: 22px;
}

.page-about .about-crumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mist);
}

.page-about .about-crumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(168, 184, 212, .45);
}

.page-about .about-crumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .about-crumb [aria-current="page"] {
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 30px 0 46px;
  border-bottom: 3px solid var(--ink-000);
  background:
    radial-gradient(120% 90% at 88% 6%, rgba(47, 230, 200, .09), transparent 58%),
    linear-gradient(180deg, transparent, rgba(16, 32, 74, .5));
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: 52px;
  }
}

.page-about .about-hero__eyebrow {
  display: inline-block;
  margin: 0 0 18px;
  padding: 5px 11px;
  border: 1px solid var(--cyan-soft);
  border-radius: var(--ab-radius);
  background: rgba(47, 230, 200, .07);
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(34px, 5.4vw, 66px);
  line-height: 1.08;
  letter-spacing: -.5px;
  color: var(--paper);
  max-width: 16ch;
}

.page-about .about-hero__intro {
  margin: 0;
  max-width: 58ch;
  font-size: 17px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  border: 3px solid var(--ink-000);
  border-radius: var(--ab-radius);
  background: var(--ab-line);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .about-stat {
  padding: 16px 16px 14px;
  background: var(--ink-800);
}

.page-about .about-stat__label {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mist);
}

.page-about .about-stat__num {
  margin: 0;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 26px;
  letter-spacing: .02em;
  color: var(--cyan);
  line-height: 1.1;
}

.page-about .about-stat__num span {
  margin-left: 3px;
  font-size: 13px;
  font-weight: 400;
  color: var(--mist);
  letter-spacing: 0;
}

/* ---------- 主体网格 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  padding-bottom: 48px;
}

@media (min-width: 1100px) {
  .page-about .about-body {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    gap: 56px;
    align-items: start;
  }
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding: 42px 0 38px;
}

.page-about .about-sec + .about-sec {
  border-top: 1px solid var(--ab-line-soft);
}

.page-about .about-sec__rule {
  position: relative;
  height: 3px;
  margin-bottom: 22px;
  background: var(--ink-000);
}

.page-about .about-sec__rule::before {
  content: "";
  position: absolute;
  left: 0;
  top: -4px;
  width: 12px;
  height: 11px;
  background: var(--cyan);
}

.page-about .about-sec__title {
  margin: 0 0 18px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(25px, 3.2vw, 36px);
  line-height: 1.24;
  letter-spacing: -.5px;
  color: var(--paper);
  max-width: 20ch;
}

.page-about .about-prose {
  max-width: 66ch;
}

.page-about .about-prose p {
  margin: 0 0 15px;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--mist);
}

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

.page-about .about-prose a {
  color: var(--volt);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 107, 255, .5);
  transition: color var(--ease), border-color var(--ease);
}

.page-about .about-prose a:hover,
.page-about .about-prose a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 图片框 ---------- */
.page-about .about-figure {
  margin: 24px 0;
  border: 3px solid var(--ink-000);
  border-radius: var(--ab-radius);
  background: var(--ink-800);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.72) brightness(.9);
}

.page-about .about-figure--track {
  margin-top: 24px;
}

@media (min-width: 1100px) {
  .page-about .about-figure--wide {
    margin-left: calc(-1 * 24px);
    margin-right: calc(-1 * 24px);
  }
}

/* ---------- 版本轨道 ---------- */
.page-about .v-track {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 6px;
}

.page-about .v-node {
  position: relative;
  padding: 16px 18px;
  border: 3px solid var(--ink-000);
  border-radius: var(--ab-radius);
  background: var(--ink-800);
  transition: transform var(--ease), box-shadow var(--ease), background var(--ease);
  outline: none;
}

.page-about .v-node:hover,
.page-about .v-node:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hard);
  background: #12265a;
}

.page-about .v-node__dot {
  display: none;
}

.page-about .v-node__ver {
  margin: 0 0 4px;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .v-node__era {
  margin: 0 0 8px;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--mist);
}

.page-about .v-node__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.66;
  color: var(--paper);
}

.page-about .v-node--current {
  border-color: var(--pulse);
  box-shadow: 0 0 0 1px rgba(255, 122, 47, .35);
}

.page-about .v-node--current .v-node__ver {
  color: var(--pulse);
}

.page-about .v-node__pop {
  margin: 10px 0 0;
  padding: 9px 11px;
  border-left: 3px solid var(--pulse);
  background: rgba(255, 122, 47, .09);
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

@media (min-width: 840px) {
  .page-about .v-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 18px;
    padding-top: 32px;
    margin-top: 22px;
  }

  .page-about .v-track::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 7px;
    height: 3px;
    background: linear-gradient(90deg, rgba(47, 230, 200, .55), var(--ab-line));
  }

  .page-about .v-node {
    padding: 18px 16px;
    overflow: visible;
  }

  .page-about .v-node__dot {
    display: block;
    position: absolute;
    left: 0;
    top: -30px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--cyan);
    border: 3px solid var(--ink-000);
  }

  .page-about .v-node--current .v-node__dot {
    background: var(--pulse);
  }

  .page-about .v-node__pop {
    position: absolute;
    left: 0;
    top: 100%;
    z-index: 4;
    width: 240px;
    margin: 10px 0 0;
    border: 3px solid var(--ink-000);
    border-left: 3px solid var(--pulse);
    border-radius: var(--ab-radius);
    background: #0d1c40;
    box-shadow: var(--shadow-hard);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px);
    transition: opacity var(--ease), transform var(--ease), visibility var(--ease);
  }

  .page-about .v-node:hover .v-node__pop,
  .page-about .v-node:focus-within .v-node__pop,
  .page-about .v-node:focus .v-node__pop {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
}

/* ---------- 12 秒 → 6 秒 对比 ---------- */
.page-about .ab-compare {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin: 26px 0;
  padding: 22px 20px;
  border: 3px solid var(--ink-000);
  border-radius: var(--ab-radius);
  background:
    linear-gradient(120deg, rgba(255, 122, 47, .08), transparent 60%),
    var(--ink-800);
  box-shadow: var(--shadow-hard);
}

@media (min-width: 620px) {
  .page-about .ab-compare {
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: center;
    gap: 18px;
  }
}

.page-about .ab-compare__col {
  display: grid;
  gap: 4px;
}

.page-about .ab-compare__tag {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--mist);
}

.page-about .ab-compare__num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(38px, 7vw, 56px);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-about .ab-compare__col--now .ab-compare__num {
  color: var(--cyan);
}

.page-about .ab-compare__unit {
  margin-left: 4px;
  font-size: 15px;
  font-weight: 400;
  color: var(--mist);
  letter-spacing: 0;
}

.page-about .ab-compare__note {
  font-size: 13px;
  color: var(--mist);
}

.page-about .ab-compare__arrow {
  font-family: var(--font-num);
  font-size: 26px;
  color: var(--pulse);
  text-align: center;
  line-height: 1;
}

/* ---------- 团队构成 ---------- */
.page-about .team-composition {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  align-items: center;
  margin-top: 28px;
  padding: 24px 20px;
  border: 3px solid var(--ink-000);
  border-radius: var(--ab-radius);
  background: var(--ink-800);
  box-shadow: var(--shadow-hard);
}

@media (min-width: 720px) {
  .page-about .team-composition {
    grid-template-columns: auto minmax(0, 1fr);
    gap: 40px;
    padding: 28px 32px;
  }
}

.page-about .team-ring {
  position: relative;
  width: 158px;
  height: 158px;
  margin: 0 auto;
  border-radius: 50%;
  background: conic-gradient(
    from -90deg,
    var(--cyan) 0 56.7%,
    var(--pulse) 56.7% 83.4%,
    var(--tactic) 83.4% 100%
  );
}

.page-about .team-ring__core {
  position: absolute;
  inset: 20px;
  border-radius: 50%;
  border: 3px solid var(--ink-000);
  background: var(--ink-900);
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 2px;
}

.page-about .team-ring__num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 34px;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-about .team-ring__unit {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .team-legend {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
}

.page-about .team-legend__item {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 11px 6px;
  border-bottom: 1px solid var(--ab-line-soft);
  transition: background var(--ease), padding-left var(--ease);
}

.page-about .team-legend__item:last-child {
  border-bottom: 0;
}

.page-about .team-legend__item:hover {
  background: rgba(47, 230, 200, .06);
  padding-left: 12px;
}

.page-about .team-legend__swatch {
  width: 12px;
  height: 12px;
  border-radius: 2px;
}

.page-about .team-legend__swatch--eng { background: var(--cyan); }
.page-about .team-legend__swatch--edit { background: var(--pulse); }
.page-about .team-legend__swatch--care { background: var(--tactic); }

.page-about .team-legend__name {
  font-size: 15px;
  color: var(--paper);
}

.page-about .team-legend__val {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: .04em;
  color: var(--cyan);
}

/* ---------- 数据区 ---------- */
.page-about .data-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  margin-top: 24px;
}

@media (min-width: 860px) {
  .page-about .data-split {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: 28px;
    align-items: start;
  }
}

.page-about .about-figure--side {
  margin: 0;
}

.page-about .metric-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .metric-card {
  display: grid;
  gap: 6px;
  padding: 16px 14px;
  border: 3px solid var(--ink-000);
  border-radius: var(--ab-radius);
  background: var(--ink-800);
  transition: transform var(--ease), box-shadow var(--ease);
}

.page-about .metric-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hard);
}

.page-about .metric-card__k {
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--mist);
}

.page-about .metric-card__v {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 24px;
  line-height: 1.1;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-about .metric-card__v span {
  margin-left: 3px;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--mist);
}

/* ---------- 内容中心三条线 ---------- */
.page-about .content-lanes {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

@media (min-width: 800px) {
  .page-about .content-lanes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    border: 3px solid var(--ink-000);
    border-radius: var(--ab-radius);
    background: var(--ink-800);
    box-shadow: var(--shadow-hard);
    overflow: hidden;
  }
}

.page-about .lane {
  position: relative;
  padding: 18px 18px 20px;
  border: 3px solid var(--ink-000);
  border-radius: var(--ab-radius);
  background: var(--ink-800);
}

@media (min-width: 800px) {
  .page-about .lane {
    border: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
  }

  .page-about .lane + .lane {
    border-left: 1px solid var(--ab-line);
  }
}

.page-about .lane--key {
  background: linear-gradient(160deg, rgba(255, 122, 47, .11), transparent 70%), var(--ink-800);
}

@media (min-width: 800px) {
  .page-about .lane--key {
    background: linear-gradient(160deg, rgba(255, 122, 47, .13), transparent 72%);
  }
}

.page-about .lane__idx {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 8px;
  border: 1px solid var(--ab-line);
  border-radius: 3px;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--tactic);
}

.page-about .lane--key .lane__idx {
  border-color: rgba(255, 122, 47, .5);
  color: var(--pulse);
}

.page-about .lane__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 19px;
  letter-spacing: -.3px;
  color: var(--paper);
}

.page-about .lane__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 合作生态 ---------- */
.page-about .partner-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 700px) {
  .page-about .partner-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .partner-cell {
  display: grid;
  gap: 6px;
  padding: 22px 18px;
  border: 3px solid var(--ink-000);
  border-radius: var(--ab-radius);
  background:
    linear-gradient(200deg, rgba(47, 230, 200, .07), transparent 60%),
    var(--ink-800);
  box-shadow: var(--shadow-hard);
  transition: transform var(--ease), background var(--ease);
}

.page-about .partner-cell:hover {
  transform: translate(-2px, -2px);
  background:
    linear-gradient(200deg, rgba(47, 230, 200, .13), transparent 60%),
    var(--ink-800);
}

.page-about .partner-cell__n {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 40px;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--cyan);
}

.page-about .partner-cell__t {
  font-size: 15px;
  color: var(--paper);
}

.page-about .partner-cell__d {
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-inline-cta {
  margin: 20px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-inline-cta a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-soft);
  transition: border-color var(--ease);
}

.page-about .about-inline-cta a:hover,
.page-about .about-inline-cta a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 收尾 ---------- */
.page-about .about-signoff {
  margin-top: 28px;
  padding: 18px 20px;
  border: 3px solid var(--ink-000);
  border-left: 3px solid var(--cyan);
  border-radius: var(--ab-radius);
  background: var(--ink-800);
}

.page-about .about-signoff__line {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper);
}

.page-about .about-signoff__line--sub {
  margin-top: 6px;
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--mist);
  word-break: break-word;
}

/* ---------- 侧栏 ---------- */
.page-about .about-aside {
  padding-top: 34px;
}

@media (min-width: 1100px) {
  .page-about .about-aside__sticky {
    position: sticky;
    top: calc(var(--top-h) + 24px);
  }
}

.page-about .about-dots {
  display: grid;
  gap: 2px;
  margin-bottom: 26px;
}

.page-about .about-dot {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  align-items: center;
  gap: 8px;
  padding: 9px 10px;
  border-left: 3px solid transparent;
  border-radius: 3px;
  text-decoration: none;
  transition: background var(--ease), border-color var(--ease), transform var(--ease);
}

.page-about .about-dot:hover,
.page-about .about-dot:focus-visible {
  background: rgba(47, 230, 200, .07);
  border-left-color: var(--cyan);
  transform: translateX(2px);
}

.page-about .about-dot__n {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--cyan);
}

.page-about .about-dot__t {
  font-size: 14px;
  color: var(--paper);
}

.page-about .about-dot:hover .about-dot__t,
.page-about .about-dot:focus-visible .about-dot__t {
  color: var(--cyan);
}

.page-about .about-keynum {
  margin: 0;
  padding: 6px 0;
  list-style: none;
  border: 3px solid var(--ink-000);
  border-radius: var(--ab-radius);
  background: var(--ink-800);
  box-shadow: var(--shadow-hard);
}

.page-about .about-keynum li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 11px 16px;
}

.page-about .about-keynum li + li {
  border-top: 1px solid var(--ab-line-soft);
}

.page-about .about-keynum .k {
  font-size: 13px;
  color: var(--mist);
}

.page-about .about-keynum .v {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: .04em;
  color: var(--cyan);
  white-space: nowrap;
}

/* ---------- 无障碍与动效降级 ---------- */
.page-about .about-dot:focus-visible,
.page-about .v-node:focus-visible,
.page-about .about-prose a:focus-visible,
.page-about .about-inline-cta a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-dot,
  .page-about .v-node,
  .page-about .metric-card,
  .page-about .partner-cell,
  .page-about .team-legend__item,
  .page-about .v-node__pop {
    transition-property: color, background-color, border-color, opacity, visibility;
  }

  .page-about .about-dot:hover,
  .page-about .v-node:hover,
  .page-about .metric-card:hover,
  .page-about .partner-cell:hover {
    transform: none;
  }
}