.page-about {
  background: var(--ink-900);
  color: var(--paper-white);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -.015em;
}

.page-about h1 {
  margin: 12px 0 0;
  font-size: clamp(32px, 6.6vw, 60px);
  line-height: 1.06;
  color: var(--paper-white);
}

.page-about h2 {
  margin: 10px 0 0;
  font-size: clamp(26px, 4.2vw, 38px);
  line-height: 1.18;
  color: var(--paper-white);
}

.page-about h3 {
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.32;
  font-weight: 700;
}

.page-about .about-section {
  padding-block: clamp(44px, 6vw, 92px);
}

.page-about .about-section__head {
  max-width: 62ch;
  margin-bottom: clamp(24px, 3.4vw, 42px);
}

.page-about .about-section__lead {
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 首栏版本变动说明 ---------- */
.page-about .about-versionbar {
  background: var(--ink-700);
  border-bottom: 1px solid var(--line);
}

.page-about .about-versionbar__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  padding-block: 13px;
}

.page-about .about-versionbar__text {
  flex: 1 1 240px;
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .about-versionbar__link {
  font-size: 13px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 216, .45);
  padding-bottom: 1px;
}

.page-about .about-versionbar__link:hover,
.page-about .about-versionbar__link:focus-visible {
  color: var(--paper-white);
  border-bottom-color: var(--paper-white);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(18px, 2.6vw, 30px) clamp(48px, 7vw, 96px);
  background:
    radial-gradient(ellipse 80% 70% at 88% -12%, rgba(11, 90, 82, .55), transparent 68%),
    radial-gradient(ellipse 55% 55% at -6% 100%, rgba(255, 61, 138, .10), transparent 70%),
    var(--ink-900);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-crumbs {
  margin-bottom: clamp(18px, 2.6vw, 32px);
}

.page-about .about-crumbs .breadcrumbs {
  font-size: 13px;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-hero__text {
  margin: 18px 0 0;
  max-width: 46ch;
  font-size: 17px;
  line-height: 1.82;
  color: var(--scale);
}

.page-about .about-hero__stats {
  margin: clamp(24px, 3vw, 34px) 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 3px;
  overflow: hidden;
}

.page-about .about-hero__stat {
  background: var(--ink-800);
  padding: 13px 15px;
}

.page-about .about-hero__stat dt {
  margin: 0;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .about-hero__stat dd {
  margin: 6px 0 0;
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  overflow: hidden;
  background: var(--ink-800);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(180deg, rgba(6, 8, 13, .22) 0 1px, transparent 1px 4px);
  opacity: .5;
}

.page-about .about-hero__caption {
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 12px;
  z-index: 1;
  margin: 0;
  padding: 7px 11px;
  font-family: var(--font-data);
  font-size: 11.5px;
  line-height: 1.5;
  color: var(--paper-white);
  background: rgba(6, 8, 13, .82);
  border-left: 2px solid var(--cyan);
}

/* ---------- 起源时间线 ---------- */
.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
}

.page-about .about-origin__rail {
  display: none;
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  display: grid;
  gap: clamp(14px, 2.2vw, 24px);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 28px;
  bottom: 28px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(53, 242, 216, .05));
}

.page-about .about-timeline__item {
  position: relative;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 22px;
  width: 9px;
  height: 9px;
  box-sizing: content-box;
  border: 2px solid var(--cyan);
  border-radius: 50%;
  background: var(--ink-900);
  box-shadow: 0 0 0 3px rgba(53, 242, 216, .12);
}

.page-about .about-timeline__card {
  position: relative;
  padding: clamp(18px, 2.6vw, 28px);
  border-radius: 3px;
  background: var(--paper);
  color: var(--ink-on-paper);
  box-shadow: 0 20px 44px -34px rgba(0, 0, 0, .95);
}

.page-about .about-timeline__card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  background-image: radial-gradient(rgba(29, 35, 43, .085) .5px, transparent .5px);
  background-size: 4px 4px;
  opacity: .45;
}

.page-about .about-timeline__stage {
  position: relative;
  z-index: 1;
  display: inline-block;
  padding: 3px 10px;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--cyan-deep);
  border: 1px solid rgba(11, 90, 82, .38);
  border-radius: 999px;
}

.page-about .about-timeline__card h3 {
  position: relative;
  z-index: 1;
  margin: 12px 0 0;
  color: var(--ink-on-paper);
}

.page-about .about-timeline__card p {
  position: relative;
  z-index: 1;
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.76;
  color: rgba(29, 35, 43, .8);
}

/* ---------- 赛区与版本目录 ---------- */
.page-about .about-board {
  background: var(--ink-800);
}

.page-about .about-board__sheet {
  position: relative;
  padding: clamp(22px, 3.4vw, 40px);
  border-radius: 4px;
  background: var(--paper);
  color: var(--ink-on-paper);
}

.page-about .about-board__lanes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 28px);
}

.page-about .about-board__lane + .about-board__lane {
  border-top: 1px dashed rgba(29, 35, 43, .3);
  padding-top: clamp(20px, 3vw, 28px);
}

.page-about .about-board__num {
  display: block;
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: clamp(38px, 6vw, 58px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--cyan-deep);
}

.page-about .about-board__lane h3 {
  margin: 12px 0 0;
  font-size: 17px;
  letter-spacing: .04em;
  color: var(--ink-on-paper);
}

.page-about .about-board__lane p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.74;
  color: rgba(29, 35, 43, .8);
}

.page-about .about-board__small {
  font-size: 13.5px !important;
  color: rgba(29, 35, 43, .62) !important;
}

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

.page-about .about-board__tags li {
  padding: 4px 9px;
  border-radius: 2px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--cyan);
  background: rgba(6, 8, 13, .88);
  border: 1px solid rgba(11, 90, 82, .55);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: var(--ink-900);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
}

.page-about .about-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 15px;
}

.page-about .about-team__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 6px 12px;
  align-items: center;
}

.page-about .about-team__name {
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--scale);
}

.page-about .about-team__count {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: 16px;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .about-team__bar {
  grid-column: 1 / -1;
  display: block;
  height: 4px;
  border-radius: 2px;
  background: rgba(200, 210, 220, .13);
  overflow: hidden;
}

.page-about .about-team__bar i {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--cyan-deep), var(--cyan));
}

.page-about .about-team__row:nth-child(1) .about-team__bar i { width: 30.4%; }
.page-about .about-team__row:nth-child(2) .about-team__bar i { width: 23.9%; }
.page-about .about-team__row:nth-child(3) .about-team__bar i { width: 19.6%; }
.page-about .about-team__row:nth-child(4) .about-team__bar i { width: 15.2%; }
.page-about .about-team__row:nth-child(5) .about-team__bar i { width: 10.9%; }

.page-about .about-team__figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow: hidden;
  background: var(--ink-800);
}

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

/* ---------- 周三节奏 ---------- */
.page-about .about-rhythm {
  background: var(--ink-800);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-rhythm__banner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
  padding: clamp(16px, 2.4vw, 24px) clamp(18px, 2.6vw, 28px);
  border: 1px solid rgba(53, 242, 216, .3);
  border-left: 3px solid var(--cyan);
  border-radius: 3px;
  background: linear-gradient(100deg, rgba(11, 90, 82, .42), rgba(17, 22, 31, .2));
  margin-bottom: clamp(18px, 2.6vw, 26px);
}

.page-about .about-rhythm__banner-num {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: clamp(36px, 5.6vw, 54px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  text-shadow: 0 0 24px rgba(53, 242, 216, .35);
}

.page-about .about-rhythm__banner-body {
  flex: 1 1 240px;
  min-width: 0;
}

.page-about .about-rhythm__banner-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--paper-white);
}

.page-about .about-rhythm__banner-note {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-rhythm__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 3px;
  overflow: hidden;
}

.page-about .about-rhythm__step {
  background: var(--ink-700);
  padding: clamp(16px, 2.4vw, 22px);
}

.page-about .about-rhythm__step span {
  display: block;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--orange);
}

.page-about .about-rhythm__step h3 {
  margin: 10px 0 0;
  font-size: 16px;
  color: var(--paper-white);
}

.page-about .about-rhythm__step p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 里程碑 ---------- */
.page-about .about-milestones {
  background: var(--ink-900);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-milestones__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-milestones__figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow: hidden;
  background: var(--ink-800);
}

.page-about .about-milestones__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 5 / 6;
  object-fit: cover;
}

.page-about .about-milestones__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2.4vw, 26px);
}

.page-about .about-milestones__item {
  position: relative;
  padding-left: 20px;
  border-left: 2px solid var(--cyan);
}

.page-about .about-milestones__item--sys {
  border-left-color: var(--gold);
}

.page-about .about-milestones__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 5px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 12px rgba(53, 242, 216, .7);
}

.page-about .about-milestones__item--sys::before {
  background: var(--gold);
  box-shadow: 0 0 12px rgba(201, 162, 39, .6);
}

.page-about .about-milestones__year {
  display: block;
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-about .about-milestones__item--sys .about-milestones__year {
  color: var(--gold);
}

.page-about .about-milestones__item h3 {
  margin: 8px 0 0;
  font-size: 18px;
  color: var(--paper-white);
}

.page-about .about-milestones__item p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-devices {
  margin-top: clamp(24px, 3.4vw, 36px);
  padding: clamp(15px, 2.2vw, 22px);
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--ink-700);
}

.page-about .about-devices__title {
  margin: 0 0 12px;
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--mist);
}

.page-about .about-devices__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
}

.page-about .about-devices__list li {
  display: flex;
  align-items: baseline;
  gap: 7px;
  font-size: 14px;
  color: var(--scale);
}

.page-about .about-devices__list b {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: 19px;
  font-weight: 700;
  color: var(--cyan);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  background: var(--ink-800);
}

.page-about .about-partners__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-partners__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px 22px;
  padding-block: clamp(20px, 3vw, 30px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-partners__num {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3.2vw, 32px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-partners__body h3 {
  margin: 0;
  font-size: 17px;
  color: var(--paper-white);
}

.page-about .about-partners__body p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--mist);
}

.page-about .about-partners__link {
  justify-self: start;
  font-size: 13.5px;
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 122, 41, .45);
  padding-bottom: 1px;
}

.page-about .about-partners__link:hover,
.page-about .about-partners__link:focus-visible {
  color: var(--paper-white);
  border-bottom-color: var(--paper-white);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  padding-block: clamp(40px, 5.6vw, 76px);
  background:
    radial-gradient(ellipse 70% 120% at 100% 0%, rgba(11, 90, 82, .55), transparent 70%),
    var(--ink-900);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  align-items: center;
}

.page-about .about-cta__text {
  margin: 14px 0 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--scale);
}

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

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

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

  .page-about .about-partners__row {
    grid-template-columns: 130px minmax(0, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    align-items: end;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: clamp(24px, 4vw, 56px);
  }

  .page-about .about-origin__rail {
    display: block;
    position: relative;
  }

  .page-about .about-origin__map {
    position: sticky;
    top: 108px;
    display: block;
    width: 100%;
    max-width: 240px;
    height: auto;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    align-items: start;
    gap: clamp(28px, 4vw, 52px);
  }

  .page-about .about-milestones__grid {
    grid-template-columns: minmax(0, .78fr) minmax(0, 1.22fr);
    align-items: start;
    gap: clamp(28px, 4vw, 52px);
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
  }
}

@media (min-width: 860px) {
  .page-about .about-board__lanes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .about-board__lane {
    padding-inline: clamp(18px, 2.4vw, 30px);
  }

  .page-about .about-board__lane:first-child {
    padding-left: 0;
  }

  .page-about .about-board__lane:last-child {
    padding-right: 0;
  }

  .page-about .about-board__lane + .about-board__lane {
    border-top: 0;
    padding-top: 0;
    border-left: 1px dashed rgba(29, 35, 43, .3);
  }
}

@media (min-width: 1040px) {
  .page-about .about-rhythm__steps {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .about-partners__row {
    grid-template-columns: 130px minmax(0, 1fr) auto;
    align-items: baseline;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
    animation: none !important;
  }
}