.page-about {
  --about-rail: 96px;
  --about-rail-gap: clamp(18px, 4vw, 56px);
  --about-tl-pad: clamp(18px, 3vw, 30px);
  --about-grid: repeating-linear-gradient(115deg, rgba(47, 243, 208, 0.055) 0 1px, transparent 1px 88px);
  --about-band-bg: linear-gradient(158deg, #16212E 0%, #22303F 58%, #16212E 100%);
  display: block;
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */

.page-about .about-crumbs {
  padding-top: clamp(14px, 3vw, 26px);
}

.page-about .about-crumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--arena-muted);
}

.page-about .about-crumb-list li + li::before {
  content: "／";
  margin-right: 6px;
  color: var(--arena-quiet);
}

.page-about .about-crumb-list a {
  color: var(--arena-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 200ms var(--arena-ease), border-color 200ms var(--arena-ease);
}

.page-about .about-crumb-list a:hover,
.page-about .about-crumb-list a:focus-visible {
  color: var(--arena-cyan-soft);
  border-color: var(--arena-cyan);
}

.page-about .about-crumb-list [aria-current="page"] {
  color: var(--arena-text);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding-top: clamp(18px, 4vw, 38px);
  background-image: var(--about-grid);
  background-repeat: no-repeat;
  background-size: 100% 100%;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 2;
}

.page-about .about-hero-index {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--arena-cyan);
}

.page-about .about-hero-title {
  margin: 14px 0 0;
  max-width: min(100%, 15em);
  letter-spacing: -0.035em;
}

.page-about .about-hero-lede {
  margin: clamp(16px, 2.6vw, 24px) 0 0;
  max-width: 62ch;
  color: var(--arena-text);
}

.page-about .about-hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 18px;
  margin: clamp(24px, 4vw, 42px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero-facts li {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding-top: 11px;
  border-top: 1px solid var(--arena-line);
}

.page-about .about-fact-num {
  font-size: clamp(20px, 2.6vw, 27px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--arena-cyan);
}

.page-about .about-fact-label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--arena-muted);
}

.page-about .about-hero-media {
  width: 100%;
  max-width: none;
  margin: clamp(26px, 4vw, 50px) 0 0;
  padding-inline: 0;
}

.page-about .about-hero-media img {
  display: block;
  width: 100%;
  height: clamp(230px, 40vw, 500px);
  object-fit: cover;
  border-radius: var(--arena-radius-lg) var(--arena-radius-lg) 0 0;
  border: 1px solid var(--arena-line);
  border-bottom: 0;
}

/* ---------- 长卷章节骨架 ---------- */

.page-about .about-chapter {
  padding-block: clamp(48px, 7vw, 100px);
}

.page-about .about-chapter--tight {
  padding-block: clamp(36px, 5vw, 68px);
}

.page-about .about-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-rail {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .about-num {
  font-size: 15px;
  letter-spacing: 0.1em;
  color: var(--arena-cyan);
}

.page-about .about-rail-label {
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--arena-muted);
}

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

.page-about .about-lede {
  max-width: 62ch;
  color: var(--arena-muted);
}

.page-about .about-prose {
  margin-top: clamp(16px, 2.6vw, 24px);
}

.page-about .about-prose--tight {
  margin-top: clamp(18px, 3vw, 28px);
}

.page-about .about-prose p + p {
  margin-top: 14px;
}

.page-about .about-inline-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: clamp(20px, 3vw, 30px) 0 0;
}

/* ---------- 规模数据 ---------- */

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(15px, 2.4vw, 22px);
  background: var(--arena-panel);
  border: 1px solid var(--arena-line);
  border-radius: var(--arena-radius-organic);
}

.page-about .about-stat-num {
  font-size: clamp(28px, 4.4vw, 42px);
  line-height: 1;
  letter-spacing: -0.035em;
  color: var(--arena-cyan);
}

.page-about .about-stat-unit {
  margin-left: 2px;
  font-size: 0.44em;
  color: var(--arena-cyan-soft);
}

.page-about .about-stat-label {
  font-size: 14px;
  line-height: 1.5;
  color: var(--arena-text);
}

.page-about .about-stat-note {
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--arena-muted);
}

/* ---------- 赛季时间轴 ---------- */

.page-about .about-timeline {
  margin-top: clamp(24px, 4vw, 40px);
  padding-left: var(--about-tl-pad);
  border-left: 2px solid var(--arena-line);
  display: grid;
  gap: 14px;
}

.page-about .about-node {
  position: relative;
  padding: clamp(14px, 2.2vw, 20px);
  background: var(--arena-panel);
  border: 1px solid var(--arena-line);
  border-radius: var(--arena-radius-organic);
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  top: clamp(20px, 2.6vw, 26px);
  left: calc(-1 * var(--about-tl-pad) - 7px);
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--arena-ink);
  border: 2px solid var(--arena-cyan);
}

.page-about .about-node-ver {
  margin: 0 0 6px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--arena-amber);
}

.page-about .about-node h3 {
  margin: 0 0 8px;
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.35;
  letter-spacing: -0.015em;
  color: var(--arena-text);
}

.page-about .about-node p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--arena-muted);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-team-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--arena-radius-md);
  border: 1px solid var(--arena-line);
}

.page-about .about-acc {
  border: 1px solid var(--arena-line);
  border-radius: var(--arena-radius-sm);
  background: var(--arena-panel);
  overflow: hidden;
}

.page-about .about-acc + .about-acc {
  margin-top: 10px;
}

.page-about .about-acc > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 600;
  color: var(--arena-text);
}

.page-about .about-acc > summary::-webkit-details-marker {
  display: none;
}

.page-about .about-acc > summary::after {
  content: "+";
  flex: none;
  font-family: var(--arena-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--arena-cyan);
}

.page-about .about-acc[open] > summary::after {
  content: "−";
}

.page-about .about-acc-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.page-about .about-team-count {
  padding: 2px 9px;
  font-family: var(--arena-mono);
  font-size: 11.5px;
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--arena-amber);
  border: 1px solid rgba(255, 196, 107, 0.38);
  border-radius: 999px;
}

.page-about .about-acc-body {
  padding: 14px 18px 18px;
  margin-top: 0;
  border-top: 1px solid var(--arena-line);
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--arena-muted);
}

/* ---------- 内容与数据来源 ---------- */

.page-about .about-sources {
  display: grid;
  gap: 14px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-source {
  padding-top: 14px;
  border-top: 2px solid var(--arena-cyan);
}

.page-about .about-source h3 {
  margin: 0 0 8px;
  font-size: 17px;
  line-height: 1.4;
  color: var(--arena-text);
}

.page-about .about-source p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--arena-muted);
}

.page-about .about-source-media {
  margin: clamp(26px, 4vw, 40px) 0 0;
}

.page-about .about-source-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  border-radius: var(--arena-radius-md) var(--arena-radius-md) var(--arena-radius-md) 8px;
  border: 1px solid var(--arena-line);
}

/* ---------- 合作 ---------- */

.page-about .about-partners {
  display: grid;
  gap: 10px;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-partner {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 15px 18px;
  border: 1px solid var(--arena-line);
  border-radius: var(--arena-radius-sm);
  background: var(--arena-panel);
}

.page-about .about-partner-num {
  flex: none;
  font-size: 24px;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--arena-cyan);
}

.page-about .about-partner-text {
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--arena-muted);
}

/* ---------- 收束色带 ---------- */

.page-about .about-band {
  position: relative;
  margin-top: clamp(44px, 6vw, 88px);
  padding-block: clamp(40px, 6vw, 76px);
  background-image: var(--about-band-bg);
  border-top: 1px solid var(--arena-line);
  overflow: hidden;
}

.page-about .about-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(115deg, rgba(47, 243, 208, 0.05) 0 1px, transparent 1px 74px);
  pointer-events: none;
}

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

.page-about .about-band-index {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--arena-cyan);
}

.page-about .about-band-title {
  margin: 12px 0 0;
  max-width: min(100%, 16em);
}

.page-about .about-promises {
  display: grid;
  gap: 12px;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-promises li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--arena-text);
}

.page-about .about-promises li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 9px;
  height: 9px;
  border-radius: 2px;
  background: var(--arena-cyan);
  transform: rotate(45deg);
}

.page-about .about-mail {
  color: var(--arena-cyan-soft);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

.page-about .about-mail:hover,
.page-about .about-mail:focus-visible {
  color: var(--arena-cyan);
}

.page-about .about-band-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: clamp(24px, 3.6vw, 36px) 0 0;
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
  }

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

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

  .page-about .about-promises {
    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-row {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: var(--about-rail-gap);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 104px;
    align-self: start;
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding-top: 8px;
  }

  .page-about .about-num {
    font-size: 30px;
    line-height: 1;
    letter-spacing: 0.02em;
  }

  .page-about .about-rail::after {
    content: "";
    width: 34px;
    height: 2px;
    background: var(--arena-cyan);
    opacity: 0.72;
  }

  .page-about .about-rail-label {
    font-size: 12px;
    letter-spacing: 0.2em;
  }

  .page-about .about-hero-title {
    max-width: min(100%, 13em);
  }
}

@media (min-width: 1040px) {
  .page-about .about-team {
    grid-template-columns: 0.82fr 1.18fr;
    align-items: start;
    gap: clamp(22px, 3vw, 34px);
  }

  .page-about .about-timeline {
    gap: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-acc > summary::after,
  .page-about .about-crumb-list a {
    transition: none;
  }
}