.page-about {
  --axis: 48px;
  position: relative;
  background: var(--ink-900);
  color: var(--text);
  overflow-x: clip;
}

@media (min-width: 880px) {
  .page-about { --axis: 96px; }
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 4vw, 46px) 0 0;
  background:
    radial-gradient(90% 120% at 10% -12%, rgba(123, 77, 255, .38) 0%, transparent 62%),
    radial-gradient(70% 90% at 96% 0%, rgba(198, 255, 61, .10) 0%, transparent 58%),
    var(--ink-900);
}

.page-about .about-crumb {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
  margin: 0 0 22px;
}

.page-about .about-crumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .about-crumb a:hover {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.page-about .about-crumb__kicker { margin-bottom: 14px; }

.page-about .about-hero__title {
  margin: 0;
  max-width: 21ch;
  font-size: clamp(29px, 6.2vw, 60px);
  line-height: 1.1;
  font-weight: 900;
  font-style: italic;
  letter-spacing: -.025em;
}

.page-about .about-hero__title em {
  font-family: var(--font-mono);
  font-style: italic;
  font-weight: 800;
  color: var(--lime);
  letter-spacing: -.03em;
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--muted);
}

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

.page-about .about-frame {
  margin: clamp(26px, 4vw, 46px) 0 0;
  overflow: hidden;
  border: 1px solid var(--ink-line);
  background: var(--ink-panel);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 32px), calc(100% - 32px) 100%, 0 100%);
}

.page-about .about-frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  opacity: .9;
}

.page-about .about-frame__caption {
  margin: 12px 0 0;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-about .about-strip {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ink-line);
  border: 1px solid var(--ink-line);
}

@media (min-width: 760px) {
  .page-about .about-strip { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

.page-about .about-strip__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 18px;
  background: var(--ink-900);
}

.page-about .about-strip__num {
  font-family: var(--font-mono);
  font-size: clamp(23px, 3.4vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--lime);
}

.page-about .about-strip__num--violet { color: var(--violet); }
.page-about .about-strip__num--orange { color: var(--orange); }

.page-about .about-strip__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 主体纵向流程 ---------- */

.page-about .about-flow {
  position: relative;
  padding-top: clamp(46px, 7vw, 92px);
}

.page-about .about-flow::before {
  content: "";
  position: absolute;
  left: calc(var(--axis) - 1px);
  top: 46px;
  bottom: 140px;
  width: 2px;
  background: linear-gradient(180deg,
    rgba(198, 255, 61, 0) 0%,
    rgba(198, 255, 61, .85) 5%,
    rgba(123, 77, 255, .8) 42%,
    rgba(34, 48, 95, .9) 76%,
    rgba(34, 48, 95, 0) 100%);
  opacity: .5;
  pointer-events: none;
}

.page-about .about-sec {
  display: grid;
  grid-template-columns: var(--axis) minmax(0, 1fr);
  padding-block: clamp(26px, 4vw, 46px);
}

.page-about .about-sec__gutter {
  display: flex;
  justify-content: flex-end;
  align-items: flex-start;
  padding-right: 12px;
}

.page-about .about-sec__num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: .12em;
  color: var(--lime);
  background: var(--ink-900);
  border: 1px solid var(--ink-line);
  padding: 5px 6px;
}

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

.page-about .about-head { margin: 0 0 22px; }

.page-about .about-head__title {
  margin: 0;
  font-size: clamp(21px, 3vw, 31px);
  font-weight: 800;
  font-style: italic;
  letter-spacing: -.02em;
  line-height: 1.28;
}

.page-about .about-head__meta {
  margin: 12px 0 0;
  max-width: 64ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 8px;
  height: 2px;
  background: var(--lime);
}

.page-about .about-note {
  margin: 20px 0 0;
  padding: 15px 18px;
  border-left: 2px solid var(--violet);
  background: rgba(123, 77, 255, .09);
  font-size: 14px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-note a,
.page-about .about-place__note a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(198, 255, 61, .45);
}

.page-about .about-note a:hover,
.page-about .about-place__note a:hover { border-bottom-color: var(--lime); }

/* ---------- 01 双主线 ---------- */

.page-about .about-pair {
  display: grid;
  gap: 1px;
  background: var(--ink-line);
  border: 1px solid var(--ink-line);
}

@media (min-width: 760px) {
  .page-about .about-pair { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

.page-about .about-pair__col {
  padding: clamp(20px, 2.6vw, 28px);
  background: var(--ink-panel);
}

.page-about .about-pair__col--a { border-top: 2px solid var(--lime); }
.page-about .about-pair__col--b { border-top: 2px solid var(--violet); }

.page-about .about-pair__title {
  margin: 0 0 16px;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -.01em;
}

/* ---------- 02 规模 ---------- */

.page-about .about-scale {
  display: grid;
  gap: 28px;
}

@media (min-width: 800px) {
  .page-about .about-scale {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 38px;
    align-items: center;
  }
}

.page-about .about-scale__ring {
  display: flex;
  justify-content: center;
}

.page-about .about-ring {
  --p: 0;
  position: relative;
  width: 172px;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: conic-gradient(
    var(--lime) 0 calc(var(--p) * 1%),
    var(--ink-line) calc(var(--p) * 1%) 100%);
}

.page-about .about-ring::after {
  content: "";
  position: absolute;
  inset: 15px;
  border-radius: 50%;
  background: var(--ink-900);
}

.page-about .about-ring__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 5px;
  text-align: center;
  padding: 0 18px;
}

.page-about .about-ring__inner b {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--lime);
}

.page-about .about-ring__inner small {
  font-size: 11.5px;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .about-scale__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--ink-line);
  border: 1px solid var(--ink-line);
}

.page-about .about-scale__item {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: 16px 18px;
  background: var(--ink-panel);
}

@media (min-width: 640px) {
  .page-about .about-scale__item { grid-template-columns: 92px minmax(0, 1fr); }
}

.page-about .about-scale__n {
  font-family: var(--font-mono);
  font-size: 27px;
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -.03em;
  color: var(--lime);
  padding-top: 2px;
}

.page-about .about-scale__n--orange { color: var(--orange); }

.page-about .about-scale__item h3 {
  margin: 0 0 5px;
  font-size: 15px;
  font-weight: 700;
}

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

/* ---------- 03 流程 ---------- */

.page-about .about-pipe { display: grid; gap: 30px; }

@media (min-width: 900px) {
  .page-about .about-pipe {
    grid-template-columns: minmax(0, 1fr) minmax(0, .76fr);
    gap: 42px;
    align-items: start;
  }
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-steps__item {
  display: grid;
  grid-template-columns: 16px minmax(0, 1fr);
  gap: 16px;
  padding: 14px 0 16px;
  border-bottom: 1px solid rgba(34, 48, 95, .75);
}

.page-about .about-steps__item:first-child { padding-top: 0; }
.page-about .about-steps__item:last-child { border-bottom: 0; }

.page-about .about-steps__dot {
  width: 10px;
  height: 10px;
  margin-top: 6px;
  background: var(--lime);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
}

.page-about .about-steps__title {
  margin: 0 0 6px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  font-size: 15.5px;
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-about .about-steps__tag {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: .04em;
  padding: 3px 7px;
  color: var(--orange);
  border: 1px solid rgba(255, 138, 43, .45);
}

.page-about .about-steps__tag--lime {
  color: var(--lime);
  border-color: rgba(198, 255, 61, .45);
}

.page-about .about-steps__tag--orange {
  color: var(--orange);
  border-color: rgba(255, 138, 43, .6);
}

.page-about .about-steps__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-pipe__media { margin: 0; }

.page-about .about-pipe__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  border: 1px solid var(--ink-line);
  opacity: .88;
}

.page-about .about-pipe__media figcaption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 04 发展阶段 ---------- */

.page-about .about-stages {
  display: grid;
  gap: 10px;
}

.page-about .about-stage {
  position: relative;
  border: 1px solid var(--ink-line);
  background: var(--ink-panel);
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--violet);
  opacity: .55;
  transition: background .2s var(--ease), opacity .2s var(--ease);
}

.page-about .about-stage.is-open::before {
  background: var(--lime);
  opacity: 1;
}

.page-about .about-stage__trigger {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  width: 100%;
  padding: 16px 18px 16px 20px;
  background: none;
  border: 0;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.page-about .disclosure__mark {
  position: relative;
  flex: 0 0 auto;
  align-self: center;
  width: 14px;
  height: 14px;
  border: 1px solid rgba(198, 255, 61, .7);
}

.page-about .disclosure__mark::before,
.page-about .disclosure__mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--lime);
  transform: translate(-50%, -50%);
}

.page-about .disclosure__mark::before { width: 8px; height: 1px; }
.page-about .disclosure__mark::after { width: 1px; height: 8px; transition: opacity .18s var(--ease); }
.page-about .is-open .disclosure__mark::after { opacity: 0; }

.page-about .about-stage__idx {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--muted);
}

.page-about .about-stage__name {
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-about .about-stage__hint {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

@media (min-width: 660px) {
  .page-about .about-stage__hint { margin-left: auto; text-align: right; }
}

.page-about .about-stage .disclosure__panel {
  margin: 0 20px;
  padding: 14px 0 18px;
  border-top: 1px dashed rgba(34, 48, 95, .95);
}

.page-about .about-stages__media {
  margin: clamp(26px, 3.6vw, 40px) 0 0;
}

.page-about .about-stages__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border: 1px solid var(--ink-line);
  opacity: .88;
}

.page-about .about-stages__media figcaption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 05 团队 ---------- */

.page-about .about-team {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--ink-line);
  border: 1px solid var(--ink-line);
}

@media (min-width: 720px) {
  .page-about .about-team { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

.page-about .about-team__item {
  position: relative;
  padding: 22px 20px 24px;
  background: var(--ink-panel);
}

.page-about .about-team__item::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 18px;
  height: 18px;
  background: linear-gradient(135deg, transparent 50%, rgba(198, 255, 61, .5) 50%);
}

.page-about .about-team__idx {
  display: block;
  margin-bottom: 10px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--lime);
}

.page-about .about-team__name {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-about .about-team__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-place {
  margin-top: 22px;
  padding: 20px 22px;
  border: 1px solid var(--ink-line);
  border-left: 3px solid var(--lime);
  background: rgba(18, 26, 58, .72);
}

.page-about .about-place__label {
  margin: 0 0 8px;
  font-size: 11.5px;
  letter-spacing: .2em;
  color: var(--muted);
}

.page-about .about-place__value {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.7;
}

.page-about .about-place__note {
  margin: 12px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 06 合作 ---------- */

.page-about .about-partner {
  display: grid;
  gap: 1px;
  background: var(--ink-line);
  border: 1px solid var(--ink-line);
}

@media (min-width: 760px) {
  .page-about .about-partner { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-about .about-partner__cell--wide { grid-column: 1 / -1; }
}

.page-about .about-partner__cell {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 18px;
  align-items: center;
  padding: 22px 20px;
  background: var(--ink-panel);
}

.page-about .about-partner__num {
  font-family: var(--font-mono);
  font-size: 38px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--text);
}

.page-about .about-partner__num--lime { color: var(--lime); }

.page-about .about-partner__cell p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 尾段行动 ---------- */

.page-about .about-cta {
  position: relative;
  margin: clamp(38px, 6vw, 78px) 0 clamp(46px, 7vw, 92px);
  padding: clamp(26px, 4vw, 44px);
  border: 1px solid var(--ink-line);
  background:
    linear-gradient(122deg, rgba(198, 255, 61, .13) 0%, rgba(123, 77, 255, .18) 58%, rgba(27, 22, 80, .4) 100%),
    var(--ink-900);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .about-cta__title {
  margin: 0;
  font-size: clamp(21px, 3vw, 30px);
  font-weight: 800;
  font-style: italic;
  letter-spacing: -.02em;
}

.page-about .about-cta__text {
  margin: 14px 0 0;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- 小屏收口 ---------- */

@media (max-width: 560px) {
  .page-about .about-sec__gutter { padding-right: 8px; }
  .page-about .about-sec__num { font-size: 11px; padding: 4px 5px; }
  .page-about .about-frame { clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%); }
  .page-about .about-cta { clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%); }
  .page-about .about-partner__cell { grid-template-columns: 48px minmax(0, 1fr); gap: 14px; }
  .page-about .about-partner__num { font-size: 32px; }
}