.page-about {
  --about-glow: rgba(255, 106, 42, 0.2);
  --about-gridline: rgba(198, 255, 74, 0.06);
  --about-body: rgba(234, 244, 238, 0.82);
  background: var(--ink-950);
  color: var(--mist-100);
  overflow-x: hidden;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 5vw, 42px) 0 clamp(34px, 6vw, 64px);
  background:
    radial-gradient(120% 90% at 88% -18%, var(--about-glow), transparent 58%),
    radial-gradient(90% 70% at 0% 0%, rgba(28, 74, 56, 0.6), transparent 62%),
    linear-gradient(180deg, var(--ink-900), var(--ink-950));
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, var(--about-gridline) 0 1px, transparent 1px 88px);
  -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%);
  pointer-events: none;
}

.page-about .about-hero > .container {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(20px, 3vw, 30px);
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--slate-400);
}

.page-about .breadcrumb__item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: var(--pine-700);
}

.page-about .breadcrumb__link {
  color: var(--slate-400);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  color: var(--lime-300);
  border-bottom-color: var(--lime-300);
}

.page-about .eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--lime-300);
}

.page-about .about-hero__title {
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(32px, 7.2vw, 66px);
  line-height: 1.03;
  letter-spacing: -0.02em;
  max-width: 20em;
}

.page-about .about-hero__accent {
  display: inline-block;
  background: linear-gradient(96deg, var(--lime-300), var(--orange-500) 78%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-hero__lede {
  max-width: 42em;
  margin: 0 0 clamp(20px, 3vw, 28px);
  font-size: clamp(15px, 1.8vw, 18px);
  line-height: 1.75;
  color: var(--about-body);
}

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

.page-about .about-meta__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 15px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line);
  background: rgba(18, 50, 39, 0.55);
  font-size: 13px;
  color: var(--mist-100);
}

.page-about .about-meta__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--lime-300);
  box-shadow: 0 0 0 3px rgba(198, 255, 74, 0.16);
}

.page-about .about-hero__figure {
  margin: clamp(24px, 4vw, 40px) 0 0;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-soft);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px;
  background: var(--ink-900);
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 3.6vw, 32px);
  line-height: 1.1;
  color: var(--orange-500);
}

.page-about .about-stats__label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--slate-400);
}

/* ---------- 通用分区节奏 ---------- */
.page-about .about-block {
  padding: clamp(42px, 7vw, 86px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-block .section-title {
  margin: 0 0 clamp(14px, 2vw, 20px);
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(25px, 4.2vw, 42px);
  line-height: 1.12;
  letter-spacing: -0.01em;
}

.page-about .about-block .lede {
  max-width: 44em;
  margin: 0;
  color: var(--about-body);
  line-height: 1.75;
}

.page-about .about-block .section-head {
  margin-bottom: clamp(24px, 4vw, 38px);
}

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 42px);
}

.page-about .about-prose p {
  margin: 0 0 14px;
  color: var(--about-body);
  line-height: 1.8;
}

.page-about .about-prose__single {
  margin: 0 0 clamp(20px, 3vw, 28px);
  color: var(--about-body);
  line-height: 1.8;
}

.page-about .about-points {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-points li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.65;
  color: var(--mist-100);
}

.page-about .about-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 9px;
  height: 9px;
  border-radius: 3px;
  background: var(--lime-300);
}

.page-about .about-pull {
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: clamp(22px, 3.6vw, 36px);
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  border-left: 4px solid var(--orange-500);
  background: linear-gradient(140deg, var(--pine-800), var(--ink-900) 72%);
}

.page-about .about-pull__note {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--lime-300);
}

.page-about .about-pull__text {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(20px, 3.4vw, 30px);
  line-height: 1.3;
  letter-spacing: -0.01em;
}

/* ---------- 目录地图 ---------- */
.page-about .about-block--map {
  background:
    radial-gradient(80% 60% at 100% 0%, rgba(126, 150, 168, 0.12), transparent 62%),
    var(--ink-900);
}

.page-about .about-map {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-about .about-map__intro p {
  margin: 0 0 14px;
  color: var(--about-body);
  line-height: 1.8;
}

.page-about .about-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-chip {
  padding: 6px 13px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line);
  background: rgba(18, 50, 39, 0.7);
  font-size: 13px;
  color: var(--mist-100);
}

.page-about .about-chip--more {
  border-color: var(--line-strong);
  color: var(--lime-300);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .about-map__figure {
  margin: 0;
  padding: clamp(16px, 3vw, 24px);
  border-radius: var(--r-lg);
  border: 1px solid var(--ghost-line);
  background: linear-gradient(170deg, rgba(126, 150, 168, 0.12), rgba(11, 24, 18, 0.9));
}

.page-about .about-map__canvas {
  overflow-x: auto;
  padding-bottom: 4px;
}

.page-about .about-map__svg {
  display: block;
  width: 100%;
  min-width: 560px;
  height: auto;
}

.page-about .about-map__svg text {
  font-family: var(--font-body);
  fill: var(--mist-100);
}

.page-about .map-link path {
  fill: none;
  stroke: rgba(198, 255, 74, 0.35);
  stroke-width: 1.6;
  stroke-dasharray: 5 6;
  stroke-linecap: round;
}

.page-about .map-node {
  outline: none;
  cursor: default;
}

.page-about .map-node rect {
  fill: var(--pine-800);
  stroke: rgba(198, 255, 74, 0.22);
  stroke-width: 1.5;
  transition: fill 0.22s var(--ease), stroke 0.22s var(--ease);
}

.page-about .map-node:hover rect,
.page-about .map-node:focus-visible rect {
  fill: var(--pine-700);
  stroke: var(--lime-300);
}

.page-about .map-node__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  fill: var(--orange-500);
}

.page-about .map-node__title {
  font-family: var(--font-head);
  font-size: 22px;
  font-weight: 900;
}

.page-about .map-node__desc {
  font-size: 13px;
  fill: var(--slate-400);
  transition: fill 0.22s var(--ease);
}

.page-about .map-node:hover .map-node__desc,
.page-about .map-node:focus-visible .map-node__desc {
  fill: var(--lime-300);
}

.page-about .about-map__cap {
  margin: 14px 0 0;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--slate-400);
}

/* ---------- 版本演进 ---------- */
.page-about .about-versions__head {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 40px);
  align-items: end;
  margin-bottom: clamp(26px, 4vw, 42px);
}

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

.page-about .about-figure img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
}

.page-about .about-figure__cap {
  margin: 12px 0 0;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--slate-400);
}

.page-about .about-versions__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
}

.page-about .about-versions__rail {
  padding: 18px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: var(--ink-900);
}

.page-about .about-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--slate-400);
}

.page-about .about-rail__nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 12px;
  border-radius: var(--r-pill);
  font-size: 14px;
  color: var(--mist-100);
  text-decoration: none;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  background: var(--pine-800);
  color: var(--lime-300);
  transform: translateX(2px);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--orange-500);
}

.page-about .about-version {
  position: relative;
  padding: clamp(20px, 3.4vw, 30px);
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: linear-gradient(160deg, var(--ink-900), var(--ink-950) 74%);
  scroll-margin-top: calc(var(--header-h) + 24px);
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .about-version + .about-version {
  margin-top: 14px;
}

.page-about .about-version:target {
  border-color: var(--line-strong);
  background: linear-gradient(160deg, var(--pine-800), var(--ink-900) 72%);
}

.page-about .about-version__tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--lime-300);
}

.page-about .about-version__title {
  margin: 8px 0 10px;
  font-family: var(--font-head);
  font-size: clamp(19px, 2.6vw, 25px);
  font-weight: 900;
  line-height: 1.24;
}

.page-about .about-version__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-body);
}

/* ---------- 团队 ---------- */
.page-about .about-team__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 clamp(24px, 3vw, 32px);
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-team__stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px;
  background: var(--ink-900);
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 4vw, 34px);
  line-height: 1;
  color: var(--lime-300);
}

.page-about .about-team__label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--slate-400);
}

.page-about .about-subtitle {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-size: clamp(17px, 2.2vw, 20px);
  font-weight: 900;
  letter-spacing: 0.01em;
}

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

.page-about .about-cadence__item {
  display: grid;
  grid-template-columns: 4.6em minmax(0, 1fr);
  gap: 12px;
  padding: 12px 14px;
  border-radius: var(--r-sm);
  border: 1px solid var(--line);
  background: rgba(11, 24, 18, 0.7);
  font-size: 14px;
  line-height: 1.6;
  color: var(--about-body);
}

.page-about .about-cadence__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange-500);
  padding-top: 3px;
}

/* ---------- 合作生态 ---------- */
.page-about .about-band {
  background:
    linear-gradient(180deg, rgba(126, 150, 168, 0.12), rgba(126, 150, 168, 0.03)),
    var(--ink-900);
  border-top: 1px solid var(--ghost-line);
  border-bottom: 1px solid var(--ghost-line);
}

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

.page-about .about-partners__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 16px;
  border-radius: var(--r-md);
  border: 1px solid var(--ghost-line);
  background: rgba(7, 17, 13, 0.55);
}

.page-about .about-partners__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3.6vw, 32px);
  line-height: 1;
  color: var(--mist-100);
}

.page-about .about-partners__label {
  font-size: 13px;
  line-height: 1.55;
  color: var(--slate-400);
}

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

.page-about .about-principle {
  position: relative;
  padding: clamp(20px, 3vw, 28px);
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: linear-gradient(165deg, var(--pine-800), var(--ink-900) 78%);
}

.page-about .about-principle__num {
  display: inline-block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange-500);
}

.page-about .about-principle__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: clamp(19px, 2.6vw, 24px);
  font-weight: 900;
  line-height: 1.25;
}

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

/* ---------- 下一步 ---------- */
.page-about .about-next__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-next__cell {
  display: flex;
}

.page-about .about-next__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  width: 100%;
  padding: 18px 20px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: var(--ink-900);
  color: var(--mist-100);
  font-size: 15px;
  line-height: 1.5;
  text-decoration: none;
  transition: border-color 0.22s var(--ease), background 0.22s var(--ease), transform 0.22s var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-color: var(--line-strong);
  background: var(--pine-800);
  transform: translateY(-2px);
}

.page-about .about-next__arrow {
  font-family: var(--font-mono);
  color: var(--orange-500);
  flex: none;
}

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

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

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

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

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-about .about-split--rev {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-map {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-about .about-versions__head {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-versions__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    align-items: start;
  }

  .page-about .about-versions__rail {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .about-figure--team {
    margin-top: 6px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-split {
    gap: 48px;
  }

  .page-about .about-next__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-version,
  .page-about .about-rail__link,
  .page-about .about-next__link,
  .page-about .map-node rect,
  .page-about .map-node__desc {
    transition: none;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible,
  .page-about .about-next__link:hover,
  .page-about .about-next__link:focus-visible {
    transform: none;
  }
}