.page-about {
  --about-rail: 7.5rem;
  --about-gap: clamp(1.25rem, 4vw, 2.5rem);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding-block: clamp(1.5rem, 4vw, 2.25rem) clamp(2rem, 6vw, 4rem);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% -15% auto -15%;
  height: 78%;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(46% 58% at 10% 22%, rgba(34, 224, 214, 0.18), transparent 70%),
    radial-gradient(44% 56% at 90% 4%, rgba(138, 92, 255, 0.22), transparent 72%),
    radial-gradient(60% 40% at 50% 100%, rgba(255, 138, 61, 0.10), transparent 74%);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.75rem);
  margin-top: clamp(1.25rem, 3vw, 2rem);
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    gap: clamp(2rem, 5vw, 4rem);
    align-items: end;
  }
}

.page-about .about-hero__eyebrow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin: 0 0 1.1rem;
}

.page-about .about-hero__eyebrow-note {
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--abg-dim);
}

.page-about .about-hero__title {
  margin: 0 0 1rem;
  text-wrap: balance;
}

.page-about .about-hero__lede {
  max-width: 38rem;
  margin: 0;
  color: var(--abg-ink);
  opacity: 0.92;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: clamp(1.25rem, 3vw, 1.85rem);
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  border: 1px solid var(--abg-line);
  border-radius: var(--abg-radius);
  overflow: hidden;
  box-shadow: var(--abg-shadow);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(7, 11, 30, 0) 42%, rgba(7, 11, 30, 0.62) 100%),
    repeating-linear-gradient(0deg, rgba(244, 241, 232, 0.045) 0 1px, transparent 1px 4px);
}

@media (min-width: 900px) {
  .page-about .about-hero__media {
    transform: rotate(-1.4deg) translateY(-0.75rem);
  }
}

/* ---------- 关键数字 ---------- */

.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(2rem, 5vw, 3.25rem) 0 0;
  padding: 1px;
  list-style: none;
  border-radius: var(--abg-radius);
  background: var(--abg-line);
  overflow: hidden;
}

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

.page-about .about-metric {
  background: var(--abg-panel);
  padding: 1.05rem 1.15rem 1.2rem;
}

.page-about .about-metric__num {
  display: block;
  font-family: var(--abg-font-mono);
  font-size: clamp(1.35rem, 3.2vw, 1.75rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--abg-cyan);
}

.page-about .about-metric:nth-child(2) .about-metric__num {
  color: var(--abg-violet);
}

.page-about .about-metric:nth-child(3) .about-metric__num {
  color: var(--abg-orange);
}

.page-about .about-metric:nth-child(4) .about-metric__num {
  color: var(--abg-green);
}

.page-about .about-metric__key {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.8rem;
  color: var(--abg-dim);
}

/* ---------- 章节通用 ---------- */

.page-about .about-chapter {
  position: relative;
  padding-block: clamp(2.25rem, 6vw, 4.5rem);
}

.page-about .about-chapter__head {
  display: grid;
  gap: 0.7rem;
  max-width: 48rem;
  margin-bottom: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-chapter__idx {
  justify-self: start;
}

.page-about .about-chapter__title {
  margin: 0;
  text-wrap: balance;
}

.page-about .about-chapter__lede {
  margin: 0;
  color: var(--abg-ink);
  opacity: 0.86;
  font-size: clamp(0.98rem, 1.6vw, 1.1rem);
  line-height: 1.75;
}

@media (min-width: 900px) {
  .page-about .about-chapter__head {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: clamp(1.5rem, 3vw, 2.75rem);
    align-items: start;
  }

  .page-about .about-chapter__idx {
    grid-column: 1;
    grid-row: 1 / span 2;
    justify-self: center;
    writing-mode: vertical-rl;
  }

  .page-about .about-chapter__title,
  .page-about .about-chapter__lede {
    grid-column: 2;
  }
}

/* ---------- 品牌从哪来 ---------- */

.page-about .about-origin {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.75rem);
}

@media (min-width: 900px) {
  .page-about .about-origin {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
    align-items: start;
  }
}

.page-about .about-origin__body p {
  margin: 0 0 1rem;
}

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

.page-about .about-origin__linkline {
  margin-top: 1.25rem;
}

.page-about .about-origin__quote {
  position: relative;
  padding: 1.25rem 1.35rem 1.35rem;
  border: 1px solid var(--abg-line);
  border-left: 2px solid var(--abg-violet);
  border-radius: var(--abg-radius-sm);
  background: var(--abg-panel);
}

.page-about .about-origin__anno {
  display: block;
  margin-bottom: 0.75rem;
}

.page-about .about-origin__quote-text {
  margin: 0;
  font-size: clamp(1rem, 1.9vw, 1.15rem);
  line-height: 1.7;
  color: var(--abg-ink);
}

@media (min-width: 900px) {
  .page-about .about-origin__quote {
    transform: translateY(1.75rem);
  }
}

/* ---------- 发展阶段 ---------- */

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

.page-about .about-stage {
  display: grid;
  gap: 0.85rem;
  padding-block: clamp(1.35rem, 3.6vw, 2.25rem);
  border-top: 1px solid var(--abg-line);
}

.page-about .about-stage:last-child {
  border-bottom: 1px solid var(--abg-line);
}

.page-about .about-stage__rail {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
}

.page-about .about-stage__node {
  flex: none;
  width: 0.72rem;
  height: 0.72rem;
  border-radius: 50%;
  border: 1px solid var(--abg-cyan);
  background: var(--abg-bg);
  box-shadow: 0 0 0 4px rgba(34, 224, 214, 0.12);
}

.page-about .about-stage:nth-child(2) .about-stage__node {
  border-color: var(--abg-violet);
  box-shadow: 0 0 0 4px rgba(138, 92, 255, 0.14);
}

.page-about .about-stage:nth-child(3) .about-stage__node {
  border-color: var(--abg-orange);
  box-shadow: 0 0 0 4px rgba(255, 138, 61, 0.14);
}

.page-about .about-stage:nth-child(4) .about-stage__node {
  border-color: var(--abg-green);
  box-shadow: 0 0 0 4px rgba(61, 220, 151, 0.14);
}

.page-about .about-stage__num {
  font-family: var(--abg-font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--abg-violet);
}

.page-about .about-stage__name {
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--abg-dim);
}

.page-about .about-stage__body h3 {
  margin: 0 0 0.5rem;
}

.page-about .about-stage__body p {
  margin: 0;
  max-width: 40rem;
  color: var(--abg-ink);
  opacity: 0.86;
}

@media (min-width: 900px) {
  .page-about .about-stage {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: clamp(1.5rem, 3vw, 2.75rem);
    padding-block: clamp(1.75rem, 3.2vw, 2.5rem);
    align-items: start;
  }

  .page-about .about-stage__rail {
    position: relative;
    flex-direction: column;
    align-items: flex-start;
    align-self: stretch;
    gap: 0.45rem;
    padding-left: 0.02rem;
  }

  .page-about .about-stage__rail::after {
    content: "";
    position: absolute;
    left: 0.34rem;
    top: 1.5rem;
    bottom: 0;
    width: 1px;
    background: linear-gradient(180deg, rgba(42, 51, 80, 0.9), rgba(42, 51, 80, 0));
  }

  .page-about .about-stage:last-child .about-stage__rail::after {
    display: none;
  }
}

/* ---------- 团队与分工 ---------- */

.page-about .about-team {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
}

@media (min-width: 900px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    align-items: start;
  }
}

.page-about .about-team__roles {
  display: grid;
  gap: 1rem;
}

@media (min-width: 780px) {
  .page-about .about-team__roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.1rem;
  }

  .page-about .about-role:nth-child(2) {
    transform: translateY(1.5rem);
  }

  .page-about .about-role:nth-child(3) {
    transform: translateY(0.55rem);
  }
}

.page-about .about-role {
  border: 1px solid var(--abg-line);
  border-radius: var(--abg-radius-sm);
  background: var(--abg-panel);
  padding: 1.15rem 1.15rem 1.3rem;
}

.page-about .about-role__tag {
  display: inline-block;
  margin-bottom: 0.7rem;
  padding: 0.2rem 0.6rem;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  border-radius: 999px;
  border: 1px solid var(--abg-line);
  color: var(--abg-cyan);
  background: rgba(34, 224, 214, 0.08);
}

.page-about .about-role--product .about-role__tag {
  color: var(--abg-violet);
  background: rgba(138, 92, 255, 0.1);
}

.page-about .about-role--service .about-role__tag {
  color: var(--abg-orange);
  background: rgba(255, 138, 61, 0.1);
}

.page-about .about-role h3 {
  margin: 0 0 0.5rem;
  font-size: 1.02rem;
}

.page-about .about-role p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--abg-ink);
  opacity: 0.82;
}

.page-about .about-team__media {
  position: relative;
  margin: 0;
  border: 1px solid var(--abg-line);
  border-radius: var(--abg-radius);
  overflow: hidden;
  box-shadow: var(--abg-shadow);
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

@media (min-width: 900px) {
  .page-about .about-team__media {
    transform: translateY(2.5rem) rotate(1.1deg);
  }
}

/* ---------- 合作生态 ---------- */

.page-about .about-eco {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

@media (min-width: 900px) {
  .page-about .about-eco {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: center;
    column-gap: clamp(1.75rem, 4vw, 3rem);
  }

  .page-about .about-eco__intro {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .about-eco__media {
    grid-column: 1;
    grid-row: 2;
  }

  .page-about .about-eco__mapwrap {
    grid-column: 2;
    grid-row: 1 / span 2;
  }
}

.page-about .about-eco__intro p {
  margin: 0 0 1rem;
}

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

.page-about .about-eco__media {
  position: relative;
  margin: 0;
  border: 1px solid var(--abg-line);
  border-radius: var(--abg-radius);
  overflow: hidden;
  box-shadow: var(--abg-shadow);
}

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

.page-about .about-eco__mapwrap {
  padding: clamp(1rem, 3vw, 1.75rem);
  border: 1px solid var(--abg-line);
  border-radius: var(--abg-radius);
  background:
    radial-gradient(60% 60% at 50% 45%, rgba(138, 92, 255, 0.12), transparent 72%),
    var(--abg-panel);
}

.page-about .about-eco__map {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-eco__map .eco-link {
  stroke: var(--abg-line);
  stroke-width: 1;
  transition: stroke 0.3s ease;
}

.page-about .about-eco__map .eco-node rect {
  fill: var(--abg-bg);
  stroke: var(--abg-line);
  stroke-width: 1;
  transition: stroke 0.3s ease, fill 0.3s ease;
}

.page-about .about-eco__map .eco-node text {
  fill: var(--abg-ink);
  font-family: var(--abg-font-body);
  font-size: 13px;
  letter-spacing: 0.04em;
  text-anchor: middle;
}

.page-about .about-eco__map .eco-core rect {
  fill: rgba(34, 224, 214, 0.1);
  stroke: var(--abg-cyan);
  stroke-width: 1.2;
}

.page-about .about-eco__map .eco-core text {
  fill: var(--abg-cyan);
  font-family: var(--abg-font-body);
  font-size: 14px;
  letter-spacing: 0.08em;
  text-anchor: middle;
}

.page-about .about-eco__map .eco-branch:hover .eco-link {
  stroke: var(--abg-cyan);
}

.page-about .about-eco__map .eco-branch:hover .eco-node rect {
  stroke: var(--abg-cyan);
  fill: rgba(34, 224, 214, 0.12);
}

.page-about .about-eco__caption {
  margin: 1rem 0 0;
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--abg-dim);
  text-align: center;
}

/* ---------- 规则透明 ---------- */

.page-about .about-rules {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

@media (min-width: 900px) {
  .page-about .about-rules {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
    column-gap: clamp(1.75rem, 4vw, 3rem);
  }
}

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

.page-about .about-rules__faq {
  display: grid;
  gap: 0.75rem;
}

.page-about .about-faq {
  border: 1px solid var(--abg-line);
  border-radius: var(--abg-radius-sm);
  background: var(--abg-panel);
  overflow: hidden;
}

.page-about .about-faq summary {
  position: relative;
  padding: 0.95rem 2.6rem 0.95rem 1.1rem;
  cursor: pointer;
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--abg-ink);
  list-style: none;
}

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

.page-about .about-faq summary::after {
  content: "+";
  position: absolute;
  right: 1.1rem;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--abg-font-mono);
  font-size: 1.1rem;
  color: var(--abg-orange);
  transition: transform 0.25s ease;
}

.page-about .about-faq[open] summary::after {
  content: "–";
}

.page-about .about-faq summary:focus-visible {
  outline: 2px solid var(--abg-cyan);
  outline-offset: -2px;
}

.page-about .about-faq p {
  margin: 0;
  padding: 0 1.1rem 1.1rem;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--abg-ink);
  opacity: 0.82;
  border-top: 1px solid var(--abg-line);
  padding-top: 0.9rem;
}

/* ---------- 资质与记录 ---------- */

.page-about .about-credits {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 1px;
  list-style: none;
  border-radius: var(--abg-radius);
  background: var(--abg-line);
  overflow: hidden;
}

@media (min-width: 780px) {
  .page-about .about-credits {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-credit {
  display: grid;
  gap: 0.4rem;
  padding: clamp(1.15rem, 3vw, 1.6rem);
  background: var(--abg-panel);
}

.page-about .about-credit__num {
  font-family: var(--abg-font-mono);
  font-size: clamp(1.2rem, 2.6vw, 1.5rem);
  font-weight: 700;
  color: var(--abg-clay);
}

.page-about .about-credit:nth-child(2) .about-credit__num {
  color: var(--abg-moss);
}

.page-about .about-credit:nth-child(3) .about-credit__num {
  color: var(--abg-cyan);
}

.page-about .about-credit__key {
  font-size: 0.95rem;
  color: var(--abg-ink);
}

.page-about .about-credit__note {
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--abg-dim);
}

.page-about .about-credits__linkline {
  margin: 1.25rem 0 0;
}

/* ---------- 合作与加入 ---------- */

.page-about .about-join {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

@media (min-width: 900px) {
  .page-about .about-join {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
    column-gap: clamp(1.75rem, 4vw, 3rem);
  }
}

.page-about .about-join__steps {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 1px;
  list-style: none;
  border-radius: var(--abg-radius);
  background: var(--abg-line);
  overflow: hidden;
}

.page-about .about-join__steps li {
  display: grid;
  grid-template-columns: 3.4rem minmax(0, 1fr);
  gap: 0.9rem;
  align-items: start;
  padding: 1.05rem 1.15rem;
  background: var(--abg-panel);
}

.page-about .about-join__n {
  font-family: var(--abg-font-mono);
  font-size: 0.9rem;
  color: var(--abg-violet);
  padding-top: 0.15rem;
}

.page-about .about-join__steps p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--abg-ink);
  opacity: 0.86;
}

.page-about .about-join__cta {
  padding: clamp(1.35rem, 3.4vw, 1.9rem);
  border: 1px solid var(--abg-line);
  border-radius: var(--abg-radius);
  background:
    radial-gradient(70% 80% at 100% 0%, rgba(255, 138, 61, 0.16), transparent 68%),
    var(--abg-panel);
}

.page-about .about-join__cta-text {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--abg-ink);
  opacity: 0.9;
}

.page-about .about-join__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

/* ---------- 动效降级 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__media,
  .page-about .about-team__media,
  .page-about .about-origin__quote,
  .page-about .about-role:nth-child(2),
  .page-about .about-role:nth-child(3) {
    transform: none;
  }

  .page-about .about-eco__map .eco-link,
  .page-about .about-eco__map .eco-node rect,
  .page-about .about-faq summary::after {
    transition: none;
  }
}