.page-about {
  --about-tl-gap: 26px;
  overflow-x: clip;
}

.page-about .about-crumbs {
  padding-top: clamp(18px, 3vw, 34px);
}

.page-about .about-crumbs .crumbs {
  font-size: 0.82rem;
  letter-spacing: 0.02em;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: clamp(24px, 4vw, 44px) clamp(44px, 7vw, 92px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -22%;
  right: -24%;
  width: min(900px, 118vw);
  aspect-ratio: 1 / 1;
  z-index: -2;
  background:
    radial-gradient(circle at 34% 30%, rgba(200, 255, 61, 0.16), transparent 58%),
    radial-gradient(circle at 68% 62%, rgba(139, 124, 255, 0.24), transparent 60%),
    linear-gradient(158deg, rgba(23, 59, 48, 0.9), rgba(7, 19, 15, 0));
  clip-path: polygon(30% 0%, 100% 12%, 88% 96%, 0% 74%);
  animation: about-glow 26s var(--ease) infinite alternate;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 78%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 78%);
}

@keyframes about-glow {
  from { transform: translate3d(0, 0, 0) rotate(-2deg); }
  to { transform: translate3d(-26px, 20px, 0) rotate(2deg); }
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(28px, 5vw, 52px);
  align-items: start;
}

.page-about .about-eyebrow {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 18px;
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.95rem, 6vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--fog);
  text-wrap: balance;
}

.page-about .about-lede {
  margin: 20px 0 0;
  max-width: 42em;
  color: var(--mist);
  font-size: clamp(0.98rem, 1.6vw, 1.08rem);
  line-height: 1.8;
}

.page-about .about-lede--sub {
  margin-top: 12px;
  color: rgba(169, 184, 174, 0.82);
  font-size: 0.94rem;
}

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

.page-about .about-metrics {
  display: grid;
  gap: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(168deg, rgba(23, 59, 48, 0.94), rgba(14, 42, 34, 0.66));
  box-shadow: var(--shadow-panel);
  overflow: hidden;
  transform: rotate(-0.6deg);
}

.page-about .about-metric {
  display: grid;
  grid-template-columns: minmax(0, auto) minmax(0, 1fr);
  gap: 4px 16px;
  align-items: baseline;
  padding: 16px clamp(16px, 3vw, 24px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-metric:first-child {
  border-top: 0;
}

.page-about .about-metric__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.5rem, 4.4vw, 2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--signal);
}

.page-about .about-metric__label {
  font-size: 0.84rem;
  line-height: 1.55;
  color: var(--mist);
}

.page-about .about-metrics__note {
  margin: 0;
  padding: 12px clamp(16px, 3vw, 24px) 16px;
  border-top: 1px solid var(--line-soft);
  font-size: 0.8rem;
  color: rgba(169, 184, 174, 0.75);
}

/* ---------- 章节通用 ---------- */
.page-about .about-stage {
  position: relative;
  padding-block: clamp(40px, 7vw, 84px);
  scroll-margin-top: 84px;
}

.page-about .about-stage__lede {
  max-width: 46em;
  margin: clamp(18px, 3vw, 26px) 0 0;
  color: var(--mist);
  font-size: 0.98rem;
  line-height: 1.8;
}

.page-about .about-stage__foot {
  margin: clamp(18px, 3vw, 26px) 0 0;
  color: rgba(169, 184, 174, 0.85);
  font-size: 0.88rem;
  line-height: 1.75;
}

.page-about .about-stage__foot a {
  color: var(--signal);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 255, 61, 0.4);
}

.page-about .about-stage__foot a:hover {
  color: var(--fog);
  border-bottom-color: var(--signal);
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  margin-top: clamp(22px, 4vw, 38px);
  align-items: start;
}

.page-about .about-origin__copy p {
  margin: 0 0 16px;
  color: var(--mist);
  font-size: 0.97rem;
  line-height: 1.85;
  max-width: 40em;
}

.page-about .about-origin__copy p:first-child {
  color: var(--fog);
}

.page-about .about-points {
  list-style: none;
  margin: 22px 0 0;
  padding: 18px clamp(16px, 3vw, 22px);
  display: grid;
  gap: 10px;
  border-left: 2px solid var(--signal);
  background: rgba(23, 59, 48, 0.5);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.page-about .about-points li {
  display: grid;
  grid-template-columns: 10px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-points__mark {
  width: 6px;
  height: 6px;
  margin-top: 9px;
  border-radius: 50%;
  background: var(--ember);
}

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

.page-about .about-origin__figure .figure__media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
}

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

.page-about .figure__caption {
  margin-top: 10px;
  font-size: 0.78rem;
  line-height: 1.6;
  color: rgba(169, 184, 174, 0.72);
}

/* ---------- 版本时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  margin-top: clamp(24px, 4vw, 40px);
  padding-left: var(--about-tl-gap);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--signal), rgba(200, 255, 61, 0.28) 52%, rgba(139, 124, 255, 0.4));
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2.5vw, 20px);
}

.page-about .timeline__item {
  position: relative;
  padding: clamp(16px, 3vw, 22px) clamp(16px, 3vw, 24px);
  background: linear-gradient(160deg, var(--deep), rgba(23, 59, 48, 0.62));
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  transition: border-color 0.22s var(--ease), transform 0.22s var(--ease);
}

.page-about .timeline__item:hover {
  border-color: rgba(200, 255, 61, 0.42);
  transform: translateX(3px);
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: calc(1px - var(--about-tl-gap));
  top: 24px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--signal);
  box-shadow: 0 0 0 4px rgba(200, 255, 61, 0.1);
}

.page-about .timeline__version {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.35rem, 4vw, 1.75rem);
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--signal);
  font-variant-numeric: tabular-nums;
}

.page-about .timeline__body {
  margin-top: 8px;
}

.page-about .timeline__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1rem, 2.4vw, 1.12rem);
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--fog);
}

.page-about .timeline__text {
  margin: 8px 0 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .timeline__more {
  margin-top: 12px;
  border-top: 1px dashed var(--line-soft);
  padding-top: 10px;
}

.page-about .timeline__more summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  list-style: none;
  font-size: 0.8rem;
  color: var(--mist);
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

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

.page-about .timeline__more summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--signal);
}

.page-about .timeline__more[open] summary::after {
  content: "−";
}

.page-about .timeline__more summary:hover,
.page-about .timeline__more summary:focus-visible {
  color: var(--fog);
  border-bottom-color: rgba(200, 255, 61, 0.5);
  outline: none;
}

.page-about .timeline__more p {
  margin: 10px 0 0;
  font-size: 0.86rem;
  line-height: 1.8;
  color: rgba(169, 184, 174, 0.9);
}

.page-about .about-route-figure {
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: clamp(12px, 2vw, 18px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(14, 42, 34, 0.5);
}

.page-about .about-route-figure .figure__media {
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-route-figure img {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- 数据流程 ---------- */
.page-about .about-process {
  display: grid;
  gap: clamp(22px, 4vw, 36px);
  margin-top: clamp(22px, 4vw, 36px);
  align-items: start;
}

.page-about .process-step {
  position: relative;
  padding: 18px clamp(16px, 3vw, 24px) 18px clamp(46px, 8vw, 62px);
  background: var(--board);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
}

.page-about .process-step + .process-step {
  margin-top: 12px;
}

.page-about .process-step__no {
  position: absolute;
  left: clamp(14px, 2.4vw, 20px);
  top: 19px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--ember);
}

.page-about .process-step__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: -0.01em;
  color: var(--fog);
}

.page-about .process-step__text {
  margin: 8px 0 0;
  font-size: 0.88rem;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .process-step__note {
  margin: 18px 0 0;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  background: rgba(255, 138, 61, 0.1);
  border-left: 2px solid var(--ember);
  font-size: 0.85rem;
  line-height: 1.75;
  color: rgba(244, 247, 242, 0.86);
}

.page-about .about-process__figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background: rgba(14, 42, 34, 0.6);
  padding: 12px;
}

.page-about .about-process__figure .figure__media {
  border-radius: var(--radius-md);
  overflow: hidden;
}

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

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 14px;
  margin-top: clamp(22px, 4vw, 34px);
}

.page-about .team-card {
  padding: clamp(18px, 3vw, 24px);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: linear-gradient(165deg, rgba(23, 59, 48, 0.82), rgba(14, 42, 34, 0.5));
  transition: border-color 0.22s var(--ease), transform 0.22s var(--ease);
}

.page-about .team-card:hover {
  border-color: rgba(200, 255, 61, 0.38);
  transform: translateY(-3px);
}

.page-about .team-card__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .team-card__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.7rem, 5vw, 2.2rem);
  font-weight: 700;
  line-height: 1;
}

.page-about .team-card--editor .team-card__num { color: var(--signal); }
.page-about .team-card--product .team-card__num { color: var(--violet); }
.page-about .team-card--success .team-card__num { color: var(--ember); }

.page-about .team-card__role {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.98rem;
  letter-spacing: -0.01em;
  color: var(--fog);
}

.page-about .team-card__desc {
  margin: 14px 0 0;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .team-card__meta {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .team-card__meta li {
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-size: 0.74rem;
  color: rgba(169, 184, 174, 0.92);
}

.page-about .team-card__bar {
  height: 3px;
  margin-top: 18px;
  border-radius: 2px;
  background: rgba(111, 143, 126, 0.2);
  overflow: hidden;
}

.page-about .team-card__bar span {
  display: block;
  height: 100%;
  border-radius: 2px;
}

.page-about .team-card--editor .team-card__bar span { width: 67%; background: var(--signal); }
.page-about .team-card--product .team-card__bar span { width: 22%; background: var(--violet); }
.page-about .team-card--success .team-card__bar span { width: 11%; background: var(--ember); }

/* ---------- 合作 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 14px;
  margin-top: clamp(22px, 4vw, 34px);
}

.page-about .partner-stat {
  padding: clamp(18px, 3vw, 26px);
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: rgba(14, 42, 34, 0.55);
}

.page-about .partner-stat--accent {
  background: linear-gradient(160deg, rgba(139, 124, 255, 0.18), rgba(14, 42, 34, 0.6));
  border-color: rgba(139, 124, 255, 0.34);
}

.page-about .partner-stat__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 6vw, 2.7rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--signal);
  font-variant-numeric: tabular-nums;
}

.page-about .partner-stat--accent .partner-stat__num {
  color: var(--violet);
}

.page-about .partner-stat__label {
  display: block;
  margin-top: 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.92rem;
  letter-spacing: 0.01em;
  color: var(--fog);
}

.page-about .partner-stat__text {
  margin: 10px 0 0;
  font-size: 0.86rem;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 企业协作 ---------- */
.page-about .about-onboard {
  margin-top: clamp(22px, 4vw, 34px);
  padding: clamp(20px, 4vw, 36px);
  display: grid;
  gap: clamp(22px, 4vw, 36px);
}

.page-about .onboard-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 3vw, 26px);
}

.page-about .onboard-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 14px;
  align-items: start;
}

.page-about .onboard-step__no {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 4vw, 1.9rem);
  font-weight: 700;
  line-height: 1;
  color: rgba(200, 255, 61, 0.75);
  font-variant-numeric: tabular-nums;
}

.page-about .onboard-step__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: -0.01em;
  color: var(--fog);
}

.page-about .onboard-step__body p {
  margin: 8px 0 0;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .onboard-step__link {
  display: inline-block;
  margin-top: 10px;
  font-size: 0.84rem;
  color: var(--signal);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 255, 61, 0.42);
  padding-bottom: 1px;
}

.page-about .onboard-step__link:hover {
  color: var(--fog);
  border-bottom-color: var(--fog);
}

.page-about .about-cta {
  padding: clamp(18px, 3vw, 26px);
  border-radius: var(--radius-md);
  background: linear-gradient(158deg, rgba(7, 19, 15, 0.85), rgba(23, 59, 48, 0.45));
  border: 1px solid var(--line);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.1rem, 3vw, 1.32rem);
  line-height: 1.35;
  letter-spacing: -0.015em;
  color: var(--fog);
}

.page-about .about-cta__text {
  margin: 10px 0 0;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--mist);
}

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

.page-about .about-topline {
  padding-bottom: clamp(28px, 5vw, 48px);
  display: flex;
  justify-content: flex-end;
}

@media (min-width: 720px) {
  .page-about {
    --about-tl-gap: 38px;
  }

  .page-about .about-metrics {
    transform: rotate(-1deg);
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: clamp(32px, 5vw, 68px);
  }

  .page-about .about-origin {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }

  .page-about .about-process {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

  .page-about .about-onboard {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.6fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero::before {
    animation: none;
  }

  .page-about .timeline__item,
  .page-about .team-card {
    transition: none;
  }

  .page-about .timeline__item:hover,
  .page-about .team-card:hover {
    transform: none;
  }
}