.page-about {
  --about-line: var(--ink-700);
  --about-panel: var(--ink-900);
  display: block;
  padding-bottom: clamp(48px, 8vw, 96px);
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  padding: clamp(16px, 3vw, 28px) 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  display: grid;
  gap: clamp(26px, 5vw, 48px);
  padding: clamp(18px, 4vw, 44px) 0 clamp(30px, 6vw, 68px);
}

.page-about .about-hero__text {
  min-width: 0;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 6.6vw, 3.6rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  font-weight: 800;
  color: var(--paper);
  margin: 12px 0 0;
  max-width: 18ch;
}

.page-about .about-hero h1::after {
  content: "";
  display: block;
  width: clamp(56px, 18vw, 128px);
  height: 5px;
  margin-top: 24px;
  background: linear-gradient(90deg, var(--orange), var(--cyan));
  transform: skewX(-24deg);
}

.page-about .about-hero__lede {
  margin-top: 24px;
  max-width: 60ch;
  font-size: clamp(1rem, 1.5vw, 1.0938rem);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__badge {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: clamp(24px, 4vw, 40px);
  min-width: 0;
  background: linear-gradient(158deg, var(--ink-800) 0%, var(--ink-950) 84%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 34px), calc(100% - 34px) 100%, 0 100%);
}

.page-about .about-hero__badge::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 88px;
  height: 4px;
  background: var(--orange);
}

.page-about .about-hero__year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.9rem, 12vw, 5.4rem);
  line-height: 0.9;
  letter-spacing: -0.05em;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__badge-label {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.24em;
  color: var(--orange);
}

.page-about .about-hero__badge-note {
  margin-top: 18px;
  max-width: 34ch;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 城市横条 ---------- */
.page-about .about-sky {
  margin: 0;
  width: 100%;
}

.page-about .about-sky img {
  display: block;
  width: 100%;
  height: clamp(170px, 30vw, 330px);
  object-fit: cover;
  filter: saturate(0.72) brightness(0.82);
}

.page-about .about-sky figcaption {
  max-width: calc(1240px + var(--gutter) * 2);
  margin-inline: auto;
  padding: 14px var(--gutter) 0;
  font-size: 0.8125rem;
  line-height: 1.7;
  letter-spacing: 0.05em;
  color: var(--muted);
}

/* ---------- 起源 ---------- */
.page-about .about-origin {
  padding: clamp(48px, 8vw, 96px) 0;
}

.page-about .about-origin__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  grid-template-columns: 1fr;
  align-items: start;
}

.page-about .about-origin__body {
  min-width: 0;
}

.page-about .about-origin__body h2,
.page-about .about-team__body h2,
.page-about .about-start h2 {
  font-family: var(--font-display);
  font-size: clamp(1.65rem, 4.6vw, 2.5rem);
  line-height: 1.12;
  letter-spacing: -0.028em;
  font-weight: 800;
  color: var(--paper);
  margin: 10px 0 20px;
  max-width: 20ch;
}

.page-about .about-origin__body p {
  max-width: 58ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-origin__body p + p {
  margin-top: 16px;
}

.page-about .about-origin__facts {
  display: grid;
  gap: 1px;
  margin: 0;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-about .about-origin__facts > div {
  padding: clamp(16px, 2.4vw, 22px);
  background: var(--about-panel);
}

.page-about .about-origin__facts dt {
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--muted);
  margin-bottom: 10px;
}

.page-about .about-origin__facts dd {
  margin: 0;
  font-size: 1.25rem;
  line-height: 1.2;
  color: var(--paper);
}

.page-about .about-origin__facts dd.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ---------- 栏目头 ---------- */
.page-about .section-head {
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .section-head__title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4.4vw, 2.35rem);
  line-height: 1.12;
  letter-spacing: -0.028em;
  font-weight: 800;
  color: var(--paper);
  margin-top: 10px;
  max-width: 24ch;
}

.page-about .section-head__lede {
  margin-top: 14px;
  max-width: 62ch;
  font-size: 0.9688rem;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 比赛日 ---------- */
.page-about .about-day {
  padding: clamp(46px, 8vw, 92px) 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-day__grid {
  display: grid;
  gap: 1px;
  grid-template-columns: 1fr;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-shift {
  position: relative;
  padding: clamp(22px, 3vw, 34px);
  background: var(--about-panel);
  transition: background-color 200ms linear;
}

.page-about .about-shift::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 0;
  background: var(--orange);
  transition: height 320ms var(--ease);
}

.page-about .about-shift:hover {
  background: var(--ink-800);
}

.page-about .about-shift:hover::before {
  height: 100%;
}

.page-about .about-shift__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.24em;
  color: var(--cyan);
  margin-bottom: 14px;
}

.page-about .about-shift__title {
  font-family: var(--font-display);
  font-size: 1.4375rem;
  letter-spacing: -0.02em;
  color: var(--paper);
  margin-bottom: 10px;
}

.page-about .about-shift p {
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-day__foot {
  margin-top: 22px;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-day__foot .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.25rem;
  color: var(--cyan);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: clamp(46px, 8vw, 92px) 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  grid-template-columns: 1fr;
  align-items: start;
}

.page-about .about-team__body {
  min-width: 0;
}

.page-about .about-team__body > p {
  max-width: 54ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-team__roles {
  margin: 28px 0 0;
  display: grid;
  gap: 1px;
  grid-template-columns: 1fr;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-team__roles > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  background: var(--about-panel);
}

.page-about .about-team__roles dt {
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .about-team__roles dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--orange);
  white-space: nowrap;
}

.page-about .about-team__roles dd .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.125rem;
}

.page-about .about-team__figure {
  margin: 0;
  min-width: 0;
  background: linear-gradient(150deg, var(--ink-800), var(--ink-950));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.68) contrast(1.06);
}

/* ---------- 赛事单元 ---------- */
.page-about .about-units {
  padding: clamp(46px, 8vw, 92px) 0;
  border-top: 1px solid var(--about-line);
}

.page-about .unit-group {
  margin-top: clamp(26px, 4vw, 38px);
}

.page-about .unit-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--about-line);
  margin-bottom: 16px;
}

.page-about .unit-group__name {
  font-family: var(--font-display);
  font-size: 1.3125rem;
  letter-spacing: -0.02em;
  color: var(--accent);
}

.page-about .unit-group__meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .unit-group__grid {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fill, minmax(148px, 1fr));
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .unit {
  --unit-color: var(--accent);
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 14px;
  background: var(--about-panel);
  border: 1px solid var(--about-line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
  transition: background-color 200ms linear, border-color 200ms linear;
}

.page-about .unit:hover,
.page-about .unit:focus-within {
  background: var(--ink-800);
  border-color: var(--unit-color);
}

.page-about .unit__icon {
  width: 26px;
  height: 26px;
  fill: none;
  stroke: var(--unit-color);
  stroke-width: 1.45;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.page-about .unit__name {
  font-size: 0.9375rem;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .unit__note {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-versions {
  padding: clamp(46px, 8vw, 92px) 0;
  border-top: 1px solid var(--about-line);
}

.page-about .track {
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
}

.page-about .track__node {
  position: relative;
  padding: 0 0 30px 32px;
  min-width: 0;
}

.page-about .track__node::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 6px;
  bottom: 0;
  width: 1px;
  background: var(--about-line);
}

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

.page-about .track__node:last-child::before {
  display: none;
}

.page-about .track__dot {
  position: absolute;
  left: 0;
  top: 4px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--ink-950);
  border: 2px solid var(--cyan);
}

.page-about .track__node:last-child .track__dot {
  border-color: var(--orange);
  background: var(--orange);
  box-shadow: 0 0 0 5px var(--accent-soft);
}

.page-about .track__tag {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
  margin-bottom: 8px;
}

.page-about .track__node:last-child .track__tag {
  color: var(--orange);
}

.page-about .track__title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  color: var(--paper);
  margin-bottom: 8px;
}

.page-about .track__node p {
  max-width: 40ch;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 归档 ---------- */
.page-about .about-archive {
  margin-top: clamp(34px, 6vw, 62px);
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  grid-template-columns: 1fr;
  padding: clamp(20px, 3vw, 32px);
  background: var(--about-panel);
  border-left: 3px solid var(--orange);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-about .about-archive__figure {
  margin: 0;
  min-width: 0;
}

.page-about .about-archive__figure img {
  display: block;
  width: 100%;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  filter: saturate(0.58) brightness(0.9);
}

.page-about .about-archive__body {
  min-width: 0;
}

.page-about .about-archive__body h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  letter-spacing: -0.022em;
  color: var(--paper);
  margin-bottom: 12px;
}

.page-about .about-archive__body p {
  max-width: 52ch;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-archive__body p + p {
  margin-top: 12px;
}

.page-about .about-archive__body .btn {
  margin-top: 20px;
}

/* ---------- 服务覆盖 ---------- */
.page-about .about-reach {
  padding: clamp(46px, 8vw, 92px) 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-reach__grid {
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
}

.page-about .about-reach__stat {
  padding: clamp(20px, 3vw, 30px);
  min-width: 0;
}

.page-about .about-reach__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2.4rem, 7.5vw, 3.5rem);
  line-height: 1;
  letter-spacing: -0.045em;
  color: var(--paper);
  margin-bottom: 14px;
}

.page-about .about-reach__stat p {
  font-size: 0.9375rem;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-reach__note {
  margin-top: clamp(24px, 4vw, 38px);
  padding-left: 20px;
  border-left: 2px solid var(--about-line);
  max-width: 70ch;
  font-size: 1rem;
  line-height: 1.88;
  color: var(--muted);
}

.page-about .about-reach__note a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-reach__note a:hover {
  color: var(--paper);
}

/* ---------- 上手引导 ---------- */
.page-about .about-start {
  padding: clamp(46px, 8vw, 92px) 0 0;
  border-top: 1px solid var(--about-line);
}

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

.page-about .about-start__steps {
  counter-reset: start-step;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-start__steps li {
  counter-increment: start-step;
  position: relative;
  padding-left: 44px;
  max-width: 60ch;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-start__steps li::before {
  content: counter(start-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  width: 32px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .about-team__roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .about-day__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 860px) {
  .page-about .track {
    grid-auto-flow: column;
    grid-auto-columns: minmax(0, 1fr);
    margin-top: clamp(38px, 5vw, 56px);
  }

  .page-about .track__node {
    padding: 42px 26px 0 0;
  }

  .page-about .track__node::before {
    left: 0;
    right: 0;
    top: 6px;
    bottom: auto;
    width: auto;
    height: 1px;
  }

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

  .page-about .track__node:last-child::before {
    display: block;
    background: linear-gradient(90deg, var(--about-line) 0%, transparent 100%);
  }

  .page-about .track__dot {
    left: 0;
    top: 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    padding-top: clamp(24px, 4vw, 56px);
  }

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

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

  .page-about .about-team__figure {
    order: 2;
  }

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

  .page-about .about-start__wrap {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }
}

@media (min-width: 1080px) {
  .page-about .unit-group__grid {
    grid-template-columns: repeat(auto-fill, minmax(168px, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-shift,
  .page-about .about-shift::before,
  .page-about .unit {
    transition: none;
  }
}