.page-about {
  --about-rail-w: 236px;
  --about-flow-gap: clamp(56px, 7vw, 104px);
  --about-text: rgba(242, 247, 244, .84);
  padding-bottom: clamp(56px, 7vw, 104px);
}

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

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding: clamp(16px, 2vw, 30px) 0 clamp(40px, 5vw, 72px);
}

.page-about .about-hero__frame {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 3.4vw, 60px);
  background:
    radial-gradient(120% 96% at 92% 4%, rgba(34, 245, 201, .13), transparent 62%),
    linear-gradient(158deg, #0E211C 0%, #071411 64%);
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-soft) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: .42;
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  right: -110px;
  top: -120px;
  width: 380px;
  height: 380px;
  pointer-events: none;
  background: radial-gradient(circle, rgba(255, 138, 61, .16), transparent 68%);
}

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

.page-about .about-hero .display-title {
  font-family: var(--font-display);
  font-size: clamp(34px, 6vw, 74px);
  line-height: 1.02;
  letter-spacing: -.01em;
  color: var(--paper);
  margin: 14px 0 0;
  max-width: 20ch;
}

.page-about .about-hero .lede {
  margin: clamp(18px, 2.2vw, 26px) 0 0;
  max-width: 64ch;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(28px, 3.4vw, 46px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 22px;
}

@media (min-width: 680px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-hero__facts .stat {
  border-left: 2px solid var(--line);
  padding-left: 14px;
}

.page-about .about-hero__facts .stat__value {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(23px, 3vw, 34px);
  line-height: 1.08;
  color: var(--neon);
}

.page-about .about-hero__facts .stat__label {
  display: block;
  margin-top: 7px;
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--muted);
}

/* ---------- 非对称主体 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(36px, 5vw, 64px);
  align-items: start;
}

@media (min-width: 1080px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(44px, 5vw, 92px);
  }
}

/* ---------- 左侧速览 ---------- */
.page-about .about-rail {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

@media (min-width: 560px) and (max-width: 1079px) {
  .page-about .about-rail {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .about-rail {
    position: sticky;
    top: 98px;
  }
}

.page-about .rail-block {
  border: 1px solid var(--line);
  background: rgba(14, 33, 28, .55);
  padding: 16px 16px 18px;
}

.page-about .rail-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--muted);
}

.page-about .rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 4px;
}

.page-about .rail-list a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 9px;
  font-size: 14px;
  color: var(--paper);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: border-color .22s var(--ease), color .22s var(--ease), background .22s var(--ease);
}

.page-about .rail-list a:hover,
.page-about .rail-list a:focus-visible {
  border-left-color: var(--neon);
  color: var(--neon);
  background: var(--neon-wash);
}

.page-about .rail-floor-code {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--neon);
}

.page-about .rail-axis {
  list-style: none;
  margin: 0;
  padding: 0 0 0 16px;
  position: relative;
  display: grid;
  gap: 11px;
}

.page-about .rail-axis::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--line);
}

.page-about .rail-axis a {
  position: relative;
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  transition: color .22s var(--ease);
}

.page-about .rail-axis a::before {
  content: "";
  position: absolute;
  left: -16px;
  top: 50%;
  transform: translateY(-50%);
  width: 7px;
  height: 7px;
  background: var(--ink-900);
  border: 1px solid var(--line);
  transition: background .22s var(--ease), border-color .22s var(--ease);
}

.page-about .rail-axis a:hover,
.page-about .rail-axis a:focus-visible {
  color: var(--neon);
}

.page-about .rail-axis a:hover::before,
.page-about .rail-axis a:focus-visible::before {
  background: var(--neon);
  border-color: var(--neon);
}

.page-about .rail-axis .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--orange-soft);
  font-size: 12px;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-flow {
  display: grid;
  gap: var(--about-flow-gap);
  min-width: 0;
}

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

.page-about .about-sec__title {
  font-family: var(--font-serif);
  font-size: clamp(23px, 3vw, 33px);
  line-height: 1.3;
  color: var(--paper);
  margin: 10px 0 0;
  max-width: 24ch;
}

.page-about .about-sec p {
  max-width: 68ch;
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--about-text);
}

.page-about .about-sec__lede {
  font-size: 16.5px;
}

.page-about .about-figure {
  margin-top: clamp(26px, 3.2vw, 40px);
}

/* ---------- 楼层剖面 ---------- */
.page-about .floors {
  display: grid;
  gap: 12px;
  margin-top: clamp(26px, 3vw, 38px);
}

.page-about .floor {
  --floor-offset: 0;
  position: relative;
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 14px;
  padding: 20px 20px 22px;
  margin-left: min(calc(var(--floor-offset) * 10px), 32px);
  border: 1px solid var(--line);
  border-left: 3px solid var(--line);
  background: linear-gradient(118deg, rgba(14, 33, 28, .88), rgba(7, 20, 17, .68));
  transition: border-color .26s var(--ease), background .26s var(--ease), transform .26s var(--ease);
}

@media (min-width: 720px) {
  .page-about .floor {
    grid-template-columns: 58px minmax(0, 1fr);
    gap: 18px;
    padding: 22px 24px 24px;
  }
}

.page-about .floor:hover,
.page-about .floor:focus-visible {
  border-left-color: var(--neon);
  border-color: rgba(34, 245, 201, .34);
  background: linear-gradient(118deg, rgba(34, 245, 201, .09), rgba(7, 20, 17, .68));
  transform: translateX(4px);
}

.page-about .floor:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 3px;
}

.page-about .floor__code {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  letter-spacing: .06em;
  color: var(--neon);
  padding-top: 3px;
}

.page-about .floor__name {
  margin: 0;
  font-family: var(--font-display);
  font-size: 21px;
  letter-spacing: -.005em;
  color: var(--paper);
}

.page-about .floor__body p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--about-text);
  max-width: 62ch;
}

.page-about .floor__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-about .floor__meta .num {
  color: var(--orange-soft);
}

/* ---------- 团队分段 ---------- */
.page-about .team-tabs {
  margin-top: clamp(26px, 3vw, 38px);
}

.page-about .team-tabs [role="tabpanel"] {
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.page-about .team-tabs [role="tabpanel"][hidden] {
  display: none;
}

.page-about .team-tabs [role="tabpanel"] h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 20px;
  line-height: 1.4;
  color: var(--neon);
}

.page-about .team-tabs [role="tabpanel"] p {
  max-width: 64ch;
  margin: 12px 0 0;
  font-size: 15.5px;
  line-height: 1.76;
  color: var(--about-text);
}

/* ---------- 比赛日 ---------- */
.page-about .matchday-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 44px);
  margin-top: clamp(26px, 3vw, 38px);
}

@media (min-width: 940px) {
  .page-about .matchday-grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, .82fr);
    align-items: start;
  }
}

.page-about .matchday {
  list-style: none;
  margin: 0;
  padding: 0 0 0 28px;
  position: relative;
  display: grid;
  gap: 26px;
}

.page-about .matchday::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(to bottom, var(--neon), var(--teal) 52%, var(--line));
}

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

.page-about .matchday__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 5px;
  width: 12px;
  height: 12px;
  background: var(--ink-900);
  border: 2px solid var(--neon);
  transform: rotate(45deg);
}

.page-about .matchday__time {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--orange-soft);
}

.page-about .matchday__item h3 {
  margin: 7px 0 0;
  font-size: 18px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .matchday__item p {
  margin: 7px 0 0;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.74;
  color: var(--about-text);
}

/* ---------- 版本 ---------- */
.page-about .versions {
  list-style: none;
  margin: clamp(28px, 3.4vw, 42px) 0 0;
  padding: 0;
}

.page-about .version {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

.page-about .version:last-child {
  border-bottom: 1px solid var(--line);
}

@media (min-width: 720px) {
  .page-about .version {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 24px;
    padding: 22px 0;
  }
}

.page-about .version__tag {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--muted);
  padding-top: 4px;
}

.page-about .version h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .version p {
  margin: 8px 0 0;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.76;
  color: var(--about-text);
}

.page-about .version--current {
  border-left: 3px solid var(--neon);
  padding-left: 18px;
  background: linear-gradient(90deg, rgba(34, 245, 201, .07), transparent 72%);
}

@media (min-width: 720px) {
  .page-about .version--current {
    padding-left: 22px;
  }
}

.page-about .version--current .version__tag {
  color: var(--neon);
}

/* ---------- 纸张面板 ---------- */
.page-about .paper-panel {
  position: relative;
  background: var(--newsprint);
  color: var(--ink-900);
  padding: clamp(24px, 3.2vw, 44px);
  margin: 0 16px 16px 0;
  box-shadow: 9px 9px 0 rgba(34, 245, 201, .22), 16px 16px 0 rgba(14, 143, 121, .16);
}

.page-about .paper-panel .eyebrow {
  color: var(--teal);
}

.page-about .paper-panel h2 {
  margin: 8px 0 0;
  font-family: var(--font-serif);
  font-size: clamp(22px, 2.8vw, 31px);
  line-height: 1.3;
  color: var(--ink-900);
}

.page-about .paper-panel p {
  max-width: 66ch;
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.76;
  color: rgba(7, 20, 17, .82);
}

.page-about .paper-panel .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  color: var(--teal);
}

/* ---------- 行动入口 ---------- */
.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 2.6vw, 30px);
}

.page-about .about-next {
  padding-bottom: clamp(12px, 2vw, 28px);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .floor {
    transition: none;
  }
  .page-about .floor:hover,
  .page-about .floor:focus-visible {
    transform: none;
  }
}