.page-about {
  --pa-gap: clamp(20px, 3.4vw, 56px);
  --pa-line: rgba(127, 243, 234, 0.16);
  --pa-line-soft: rgba(127, 243, 234, 0.07);
  display: block;
  position: relative;
  background:
    radial-gradient(900px 520px at 88% -6%, rgba(22, 224, 210, 0.13), transparent 62%),
    radial-gradient(760px 640px at 2% 44%, rgba(18, 51, 90, 0.72), transparent 64%),
    var(--deep-sea);
  color: var(--mist-white);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: hidden;
  padding-bottom: clamp(56px, 8vw, 120px);
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about a:focus-visible,
.page-about [tabindex]:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: 2px;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: clamp(16px, 2.6vw, 30px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(20px, 3.6vw, 44px) clamp(34px, 6vw, 78px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 52px);
}

.page-about .about-hero__rail {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
}

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line-mid);
  border-radius: var(--radius-soft);
  overflow: hidden;
  background: var(--hull-blue);
  box-shadow: var(--shadow-lift);
}

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

.page-about .about-hero__caption {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gray-blue);
  padding-left: 2px;
}

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

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.2vw, 60px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--mist-white);
  max-width: 15em;
}

.page-about .about-hero__lede {
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  max-width: 34em;
  font-size: clamp(15.5px, 1.1vw, 17.5px);
  line-height: 1.82;
  color: var(--gray-blue);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(24px, 3.4vw, 40px) 0 0;
  padding: 0;
  background: var(--pa-line);
  border: 1px solid var(--pa-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-facts__item {
  padding: 14px 16px;
  background: rgba(6, 18, 36, 0.6);
}

.page-about .about-facts dt {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gray-blue);
}

.page-about .about-facts dd {
  margin: 5px 0 0;
  font-size: 21px;
  line-height: 1.2;
  color: var(--signal-gold);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  position: relative;
  padding-block: clamp(38px, 6vw, 86px);
}

.page-about .about-section__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 40px);
}

.page-about .about-section__rail {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--gray-blue);
}

.page-about .about-rail-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  color: var(--fluoro-cyan);
  font-size: 14px;
  letter-spacing: 0.08em;
}

.page-about .about-rail-line {
  flex: 1;
  height: 1px;
  min-height: 0;
  background: linear-gradient(90deg, var(--line-strong), transparent 92%);
}

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

.page-about .about-section__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.6vw, 40px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--mist-white);
  max-width: 20em;
}

.page-about .about-section__note {
  margin: 10px 0 0;
  font-size: 13.5px;
  letter-spacing: 0.01em;
  color: var(--gray-blue);
  max-width: 34em;
}

.page-about .prose {
  max-width: 42em;
  margin-top: clamp(14px, 2vw, 20px);
}

.page-about .prose p {
  margin: 0 0 1em;
  font-size: 15.5px;
  line-height: 1.82;
  color: rgba(234, 244, 247, 0.86);
}

.page-about .prose p:last-child {
  margin-bottom: 0;
}

/* ---------- 八类赛事 ---------- */
.page-about .about-sports__list {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--pa-line);
  border: 1px solid var(--pa-line);
  border-radius: var(--radius-soft);
  overflow: hidden;
}

.page-about .about-sport {
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: clamp(16px, 2.2vw, 24px) clamp(13px, 1.8vw, 20px);
  background: rgba(10, 27, 51, 0.88);
  transition: background 0.35s ease;
}

.page-about .about-sport:hover {
  background: rgba(18, 51, 90, 0.92);
}

.page-about .about-sport__icon {
  display: block;
  width: 38px;
  height: 38px;
  color: var(--aqua-glow);
  transition: color 0.3s ease;
}

.page-about .about-sport:hover .about-sport__icon {
  color: var(--fluoro-cyan);
}

.page-about .about-sport__icon svg {
  display: block;
  width: 100%;
  height: 100%;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.page-about .about-sport__name {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--mist-white);
}

.page-about .about-sport__desc {
  margin: 0;
  font-size: 13px;
  line-height: 1.62;
  color: var(--gray-blue);
}

.page-about .about-figure--sports {
  margin-top: clamp(20px, 3vw, 32px);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-rhythm__list {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2vw, 20px);
}

.page-about .about-rhythm__item {
  position: relative;
  padding: 20px 22px 22px;
  border: 1px solid var(--pa-line);
  border-radius: var(--radius);
  background:
    linear-gradient(150deg, rgba(18, 51, 90, 0.82), rgba(10, 27, 51, 0.55));
}

.page-about .about-rhythm__item::after {
  content: "";
  position: absolute;
  left: 22px;
  right: 22px;
  top: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--fluoro-cyan), rgba(22, 224, 210, 0));
}

.page-about .about-rhythm__num {
  display: inline-block;
  padding: 3px 12px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--coral);
  background: rgba(255, 107, 74, 0.12);
  border: 1px solid rgba(255, 107, 74, 0.45);
  border-radius: 999px;
}

.page-about .about-rhythm__item h3 {
  margin: 12px 0 0;
  font-size: 17.5px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--mist-white);
}

.page-about .about-rhythm__item p {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--gray-blue);
}

/* ---------- 版本时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  position: relative;
  margin: clamp(24px, 3.6vw, 40px) 0 0;
  padding: 0 0 0 28px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 10px;
  bottom: 26px;
  width: 1px;
  background: linear-gradient(180deg, var(--fluoro-cyan), rgba(22, 224, 210, 0.06));
}

.page-about .about-timeline__node {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding-bottom: clamp(24px, 3.4vw, 38px);
}

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

.page-about .about-timeline__node::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--deep-sea);
  border: 2px solid var(--fluoro-cyan);
  transition: background 0.3s ease, box-shadow 0.3s ease;
}

.page-about .about-timeline__node:hover::before,
.page-about .about-timeline__node:focus-visible::before,
.page-about .about-timeline__node:focus::before {
  background: var(--fluoro-cyan);
  box-shadow: 0 0 0 5px rgba(22, 224, 210, 0.18);
}

.page-about .about-timeline__year {
  font-size: 21px;
  font-weight: 700;
  letter-spacing: 0.05em;
  line-height: 1.2;
  color: var(--signal-gold);
}

.page-about .about-timeline__content h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  letter-spacing: -0.01em;
  color: var(--mist-white);
}

.page-about .about-timeline__content p {
  margin: 7px 0 0;
  max-width: 40em;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--gray-blue);
}

.page-about .about-figure--version {
  margin-top: clamp(22px, 3vw, 34px);
}

/* ---------- 多端原则 ---------- */
.page-about .about-devices__list {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2vw, 20px);
}

.page-about .about-device {
  padding: 22px 20px 24px;
  border: 1px solid var(--pa-line);
  border-radius: var(--radius-soft);
  background:
    radial-gradient(120% 100% at 0% 0%, rgba(22, 224, 210, 0.1), transparent 58%),
    rgba(6, 18, 36, 0.5);
}

.page-about .about-device__share {
  display: block;
  font-size: 30px;
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.1;
  color: var(--aqua-glow);
}

.page-about .about-device h3 {
  margin: 12px 0 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--mist-white);
  letter-spacing: -0.01em;
}

.page-about .about-device p {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--gray-blue);
}

/* ---------- 团队 ---------- */
.page-about .about-team__list {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--pa-line-soft);
  border-left: 1px solid var(--pa-line);
}

.page-about .about-role {
  padding: 18px 0 18px 20px;
  border-left: 3px solid transparent;
  transition: border-color 0.3s ease, background 0.3s ease;
}

.page-about .about-role:hover {
  border-left-color: var(--fluoro-cyan);
  background: rgba(22, 224, 210, 0.05);
}

.page-about .about-role h3 {
  margin: 0;
  font-size: 16.5px;
  font-weight: 700;
  color: var(--mist-white);
  letter-spacing: -0.01em;
}

.page-about .about-role p {
  margin: 7px 0 0;
  max-width: 40em;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--gray-blue);
}

/* ---------- 后续入口 ---------- */
.page-about .about-next__links {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--pa-line);
  border: 1px solid var(--pa-line);
  border-radius: var(--radius-soft);
  overflow: hidden;
}

.page-about .about-next__links li {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 18px 20px;
  background: rgba(6, 18, 36, 0.62);
  transition: background 0.3s ease;
}

.page-about .about-next__links li:hover {
  background: rgba(18, 51, 90, 0.85);
}

.page-about .about-next__links a {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--fluoro-cyan);
  text-decoration: none;
}

.page-about .about-next__links a:hover {
  color: var(--aqua-glow);
}

.page-about .about-next__links span {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--gray-blue);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-sports__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .about-timeline__node {
    grid-template-columns: 128px minmax(0, 1fr);
    gap: clamp(16px, 2.4vw, 32px);
    align-items: start;
  }

  .page-about .about-timeline__year {
    text-align: right;
    padding-right: 4px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(240px, 31%) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 76px);
    align-items: start;
  }

  .page-about .about-section__grid {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 62px);
  }

  .page-about .about-section__rail {
    flex-direction: column;
    align-items: flex-start;
    padding-top: 6px;
  }

  .page-about .about-rail-line {
    width: 1px;
    height: auto;
    flex: 1;
    min-height: 40px;
    background: linear-gradient(180deg, var(--line-strong), transparent 88%);
  }

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

@media (min-width: 1080px) {
  .page-about .about-devices__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}