.page-about {
  --about-rail: clamp(2.75rem, 8vw, 7rem);
  --about-hair: rgba(30, 74, 122, .55);
  --about-glow: rgba(0, 229, 255, .16);
  background: var(--tx-night);
  color: var(--tx-ice);
  font-family: var(--tx-body);
  overflow-x: hidden;
}

.page-about .about-bc {
  padding-block: 1rem .25rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: clamp(2.25rem, 7vw, 5.5rem) clamp(2rem, 5vw, 4rem);
  background:
    radial-gradient(130% 90% at 88% -12%, rgba(0, 229, 255, .2), transparent 58%),
    radial-gradient(100% 85% at -12% 112%, rgba(255, 107, 26, .13), transparent 62%),
    linear-gradient(157deg, var(--tx-night) 0%, var(--tx-blue) 54%, var(--tx-teal) 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 229, 255, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 255, .07) 1px, transparent 1px);
  background-size: 68px 68px;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, .85), transparent 82%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, .85), transparent 82%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .22;
  mix-blend-mode: screen;
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero__slash {
  position: absolute;
  left: -14%;
  right: -14%;
  bottom: 6%;
  height: 16%;
  transform: skewY(-4.5deg);
  background: linear-gradient(90deg, transparent 0%, rgba(0, 229, 255, .14) 28%, rgba(36, 20, 71, .5) 66%, transparent 100%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__title {
  margin: 1rem 0 0;
  max-width: 20ch;
  font-family: var(--tx-display);
  font-weight: 200;
  font-size: clamp(2.3rem, 8.6vw, 5.4rem);
  line-height: .98;
  letter-spacing: -0.04em;
  color: var(--tx-ice);
}

.page-about .about-hero__accent {
  color: var(--tx-cyan);
  text-shadow: 0 0 26px rgba(0, 229, 255, .35);
}

.page-about .about-hero__lede {
  max-width: 54ch;
  margin: clamp(1rem, 3vw, 1.6rem) 0 0;
  font-size: clamp(1rem, 2.2vw, 1.1rem);
  line-height: 1.85;
  color: var(--tx-steel);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .85rem 1.25rem;
  margin: clamp(1.6rem, 4vw, 2.5rem) 0 0;
  max-width: 46rem;
}

.page-about .about-stat {
  padding-top: .6rem;
  border-top: 1px solid rgba(0, 229, 255, .38);
}

.page-about .about-stat__num {
  margin: 0;
  font-family: var(--tx-mono);
  font-weight: 700;
  font-size: clamp(1.35rem, 3.4vw, 1.9rem);
  letter-spacing: .02em;
  color: var(--tx-cyan);
}

.page-about .about-stat__label {
  margin-top: .25rem;
  font-size: .78rem;
  letter-spacing: .1em;
  color: var(--tx-steel);
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  background: rgba(6, 21, 46, .95);
  border-block: 1px solid var(--about-hair);
}

.page-about .about-index__inner {
  padding-block: .7rem;
}

.page-about .about-index__list {
  display: flex;
  flex-wrap: nowrap;
  gap: .25rem 1.4rem;
  margin: 0;
  padding: 0 0 .3rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index__link {
  display: inline-block;
  padding: .3rem .1rem;
  white-space: nowrap;
  font-family: var(--tx-mono);
  font-size: .78rem;
  letter-spacing: .14em;
  color: var(--tx-steel);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color .2s var(--tx-ease), border-color .2s var(--tx-ease);
}

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

.page-about .about-index__link[aria-current="location"] {
  color: var(--tx-ice);
  border-bottom-color: var(--tx-orange);
}

/* ---------- 长卷章节 ---------- */
.page-about .about-chapter {
  position: relative;
  padding-block: clamp(2.75rem, 8vw, 6.5rem);
}

.page-about .about-chapter--origin {
  background: linear-gradient(180deg, var(--tx-night) 0%, rgba(10, 42, 92, .6) 100%);
}

.page-about .about-chapter--coverage {
  background: linear-gradient(180deg, rgba(10, 42, 92, .6) 0%, var(--tx-teal) 100%);
}

.page-about .about-chapter--dimensions {
  background: linear-gradient(180deg, var(--tx-teal) 0%, var(--tx-violet) 100%);
}

.page-about .about-chapter--team {
  background: linear-gradient(180deg, var(--tx-violet) 0%, var(--tx-blue) 100%);
}

.page-about .about-chapter--ecosystem {
  background: linear-gradient(180deg, var(--tx-blue) 0%, var(--tx-wine) 100%);
}

.page-about .about-chapter--next {
  background: linear-gradient(180deg, var(--tx-wine) 0%, var(--tx-night) 100%);
}

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

.page-about .about-chapter__rail {
  display: flex;
  align-items: center;
  gap: .9rem;
}

.page-about .about-chapter__num {
  display: block;
  font-family: var(--tx-display);
  font-weight: 200;
  font-size: clamp(2.4rem, 9vw, 5.6rem);
  line-height: .85;
  letter-spacing: -0.05em;
  color: rgba(232, 241, 255, .16);
}

@supports ((-webkit-text-stroke: 1px rgba(0, 229, 255, .5))) {
  .page-about .about-chapter__num {
    color: transparent;
    -webkit-text-stroke: 1px rgba(0, 229, 255, .48);
  }
}

.page-about .about-chapter__line {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, rgba(0, 229, 255, .5), transparent);
}

.page-about .about-chapter__title {
  margin: .5rem 0 0;
  max-width: 22ch;
  font-family: var(--tx-display);
  font-weight: 400;
  font-size: clamp(1.7rem, 5.2vw, 3.2rem);
  line-height: 1.06;
  letter-spacing: -0.03em;
  color: var(--tx-ice);
}

.page-about .about-chapter__lead {
  max-width: 52ch;
  margin: 1rem 0 0;
  font-size: clamp(1rem, 2.2vw, 1.12rem);
  line-height: 1.82;
  color: var(--tx-cyan);
}

.page-about .about-chapter__prose {
  margin-top: 1.1rem;
}

.page-about .about-chapter__tail {
  max-width: 62ch;
  margin: 1.6rem 0 0;
  line-height: 1.85;
  color: var(--tx-steel);
}

.page-about .about-inline-link {
  color: var(--tx-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, .45);
  transition: border-color .2s var(--tx-ease);
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  border-bottom-color: var(--tx-orange);
}

/* ---------- 记忆点列表 ---------- */
.page-about .about-points {
  display: grid;
  gap: .9rem;
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-points li {
  padding-left: 1rem;
  border-left: 2px solid rgba(0, 229, 255, .5);
  line-height: 1.8;
}

.page-about .about-points strong {
  display: block;
  font-size: 1rem;
  font-weight: 600;
  color: var(--tx-ice);
}

.page-about .about-points span {
  display: block;
  margin-top: .2rem;
  font-size: .95rem;
  color: var(--tx-steel);
}

/* ---------- 赛事标签 ---------- */
.page-about .about-leagues {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: 1.4rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-league {
  padding: .4rem .85rem;
  font-size: .85rem;
  letter-spacing: .05em;
  color: var(--tx-ice);
  background: rgba(6, 21, 46, .55);
  border: 1px solid rgba(0, 229, 255, .3);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
}

/* ---------- 数字格 ---------- */
.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(1, minmax(0, 1fr));
  gap: .75rem;
  margin-top: 1.5rem;
}

.page-about .about-figure-cell {
  padding: .85rem 1rem;
  background: rgba(6, 21, 46, .5);
  border-left: 3px solid var(--tx-orange);
}

.page-about .about-figure-cell__num {
  display: block;
  font-family: var(--tx-mono);
  font-weight: 700;
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  letter-spacing: .02em;
  color: var(--tx-orange);
}

.page-about .about-figure-cell__label {
  display: block;
  margin-top: .15rem;
  font-size: .88rem;
  color: var(--tx-steel);
}

/* ---------- 图 ---------- */
.page-about .about-figure {
  margin: 1.75rem 0 0;
}

.page-about .about-figure .tx-media {
  border: 1px solid rgba(0, 229, 255, .22);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-figure__cap {
  margin-top: .6rem;
  font-size: .85rem;
  line-height: 1.7;
  color: var(--tx-steel);
}

/* ---------- 版本时间线 ---------- */
.page-about .about-versions {
  position: relative;
  margin: 1.8rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-versions::before {
  content: "";
  position: absolute;
  left: .4rem;
  top: .7rem;
  bottom: .7rem;
  width: 2px;
  background: linear-gradient(180deg, var(--tx-cyan), rgba(0, 229, 255, .05));
}

.page-about .about-versions__item {
  position: relative;
  padding: 0 0 1.6rem 2.1rem;
}

.page-about .about-versions__item:last-child {
  padding-bottom: 0;
}

.page-about .about-versions__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: .35rem;
  width: .82rem;
  height: .82rem;
  border-radius: 50%;
  border: 2px solid var(--tx-cyan);
  background: var(--tx-night);
}

.page-about .about-versions__ver {
  display: inline-block;
  padding: .15rem .5rem;
  font-family: var(--tx-mono);
  font-size: .85rem;
  letter-spacing: .08em;
  color: var(--tx-night);
  background: var(--tx-cyan);
}

.page-about .about-versions__title {
  margin: .55rem 0 .3rem;
  font-size: 1.12rem;
  font-weight: 600;
  color: var(--tx-ice);
}

.page-about .about-versions__text {
  margin: 0;
  max-width: 58ch;
  font-size: .96rem;
  line-height: 1.82;
  color: var(--tx-steel);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .9rem;
  margin-top: 1.6rem;
}

.page-about .about-team__item {
  position: relative;
  padding: 1.1rem 1rem 1.2rem;
  background: linear-gradient(150deg, rgba(10, 42, 92, .82), rgba(6, 21, 46, .7));
  border: 1px solid var(--about-hair);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}

.page-about .about-team__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 26px;
  height: 2px;
  background: var(--tx-cyan);
}

.page-about .about-team__role {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--tx-ice);
}

.page-about .about-team__desc {
  margin: .5rem 0 0;
  font-size: .92rem;
  line-height: 1.78;
  color: var(--tx-steel);
}

/* ---------- 流程 ---------- */
.page-about .about-process {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .9rem 1rem;
  margin: 1.8rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-process__step {
  padding-top: .7rem;
  border-top: 2px solid rgba(0, 229, 255, .32);
}

.page-about .about-process__step:nth-child(2) {
  border-top-color: rgba(0, 229, 255, .5);
}

.page-about .about-process__step:nth-child(3) {
  border-top-color: rgba(0, 229, 255, .72);
}

.page-about .about-process__step:nth-child(4) {
  border-top-color: rgba(255, 107, 26, .75);
}

.page-about .about-process__step:nth-child(5) {
  border-top-color: rgba(61, 220, 151, .78);
}

.page-about .about-process__idx {
  display: block;
  font-family: var(--tx-mono);
  font-size: .8rem;
  letter-spacing: .14em;
  color: var(--tx-steel);
}

.page-about .about-process__name {
  display: block;
  margin-top: .25rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--tx-ice);
}

.page-about .about-process__desc {
  display: block;
  margin-top: .25rem;
  font-size: .84rem;
  line-height: 1.65;
  color: var(--tx-steel);
}

.page-about .about-figure--team {
  margin-top: 1.9rem;
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .9rem;
  margin-top: 1.6rem;
}

.page-about .about-partner {
  padding: 1rem 1rem 1.1rem;
  background: rgba(6, 21, 46, .42);
  border-left: 3px solid var(--tx-cyan);
}

.page-about .about-partner__name {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--tx-ice);
}

.page-about .about-partner__desc {
  margin: .45rem 0 0;
  font-size: .92rem;
  line-height: 1.78;
  color: var(--tx-steel);
}

.page-about .about-honors {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem 1.5rem;
  margin-top: 1.5rem;
  padding-top: 1.1rem;
  border-top: 1px dashed rgba(255, 209, 102, .4);
}

.page-about .about-honors__item {
  margin: 0;
  font-size: .95rem;
  color: var(--tx-steel);
}

.page-about .about-honors__key {
  color: var(--tx-amber);
}

/* ---------- 后续规划 ---------- */
.page-about .about-roadmap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
  margin-top: 1.7rem;
}

.page-about .about-roadmap__row {
  padding-left: 1rem;
  border-left: 2px solid rgba(0, 229, 255, .45);
}

.page-about .about-roadmap__title {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--tx-ice);
}

.page-about .about-roadmap__text {
  margin: .45rem 0 0;
  max-width: 58ch;
  font-size: .95rem;
  line-height: 1.82;
  color: var(--tx-steel);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  position: relative;
  padding-block: clamp(2.75rem, 7vw, 5.5rem);
  border-top: 1px solid var(--about-hair);
  background:
    radial-gradient(95% 80% at 22% 0%, rgba(0, 229, 255, .14), transparent 62%),
    linear-gradient(180deg, var(--tx-night) 0%, #04101f 100%);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--tx-display);
  font-weight: 200;
  font-size: clamp(1.8rem, 5.4vw, 3rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--tx-ice);
}

.page-about .about-cta__text {
  max-width: 56ch;
  margin: 1rem 0 0;
  font-size: 1rem;
  line-height: 1.82;
  color: var(--tx-steel);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: 1.6rem;
}

.page-about .about-cta__actions .tx-btn {
  text-decoration: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-figures {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-chapter__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(1.5rem, 4vw, 3.5rem);
    align-items: start;
  }

  .page-about .about-chapter__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
    position: sticky;
    top: 4.5rem;
  }

  .page-about .about-chapter__line {
    width: 1px;
    height: clamp(4rem, 12vw, 9rem);
    background: linear-gradient(180deg, rgba(0, 229, 255, .55), transparent);
  }

  .page-about .about-process {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .about-roadmap {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.5rem;
  }
}

@media (min-width: 1080px) {
  .page-about .about-team {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-versions__item {
    display: grid;
    grid-template-columns: 6rem minmax(0, 1fr);
    align-items: start;
    gap: 1rem;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .about-inline-link {
    transition: none;
  }
}