.page-about {
  display: block;
  background: var(--bg);
  color: var(--fg);
}

/* ============ 面包屑 ============ */
.page-about .about-crumbs {
  background: var(--bg-alt);
  border-bottom: 1px solid var(--line-soft);
}
.page-about .about-crumbs > .wrap {
  padding-top: 13px;
  padding-bottom: 13px;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -12% -14% auto -14%;
  height: 136%;
  pointer-events: none;
  background:
    linear-gradient(112deg, transparent 0 38%, rgba(41, 224, 208, 0.07) 38% 55%, transparent 55%),
    linear-gradient(292deg, transparent 0 58%, rgba(245, 158, 66, 0.08) 58% 71%, transparent 71%);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.26;
  background-image:
    repeating-linear-gradient(90deg, var(--line-soft) 0 1px, transparent 1px 88px),
    repeating-linear-gradient(0deg, var(--line-soft) 0 1px, transparent 1px 88px);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 80%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 80%);
}

.page-about .hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 54px);
  padding-top: clamp(44px, 8vw, 100px);
  padding-bottom: clamp(38px, 6vw, 76px);
}
@media (min-width: 940px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.62fr) minmax(240px, 0.85fr);
    align-items: end;
  }
}

.page-about .hero-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: 12px;
}
.page-about .hero-heading h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(31px, 6.2vw, 62px);
  line-height: 1.06;
  letter-spacing: -0.012em;
  overflow-wrap: break-word;
}
.page-about .hero-heading .vert-note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--c-cyan);
  opacity: 0.85;
}
@media (min-width: 700px) {
  .page-about .hero-heading {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: start;
    gap: 26px;
  }
  .page-about .hero-heading .vert-note {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    letter-spacing: 0.26em;
    margin-top: 10px;
  }
}

.page-about .hero-lead {
  margin: 20px 0 0;
  max-width: 42em;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.85;
  color: var(--fg-dim);
}

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

.page-about .hero-side {
  border-top: 1px solid var(--line-cyan);
  padding-top: 18px;
}
@media (min-width: 940px) {
  .page-about .hero-side {
    border-top: 0;
    border-left: 1px solid var(--line-cyan);
    padding-top: 0;
    padding-left: clamp(16px, 2.2vw, 28px);
  }
}
.page-about .hero-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .hero-facts li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-soft);
}
.page-about .hero-facts li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}
.page-about .hf-num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 21px;
  font-weight: 700;
  color: var(--c-cyan);
  letter-spacing: 0.02em;
}
.page-about .hf-key {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--fg-dim);
}

/* ============ 章节通用 ============ */
.page-about .sec-head {
  max-width: 62ch;
  margin-bottom: clamp(24px, 3.4vw, 44px);
}
.page-about .sec-head h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.6vw, 40px);
  line-height: 1.18;
  letter-spacing: -0.006em;
}
.page-about .sec-lead {
  margin: 14px 0 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--fg-dim);
}

/* ============ 发展历程 ============ */
.page-about .about-timeline {
  position: relative;
  background: var(--bg-alt);
  border-bottom: 1px solid var(--line);
  padding-top: clamp(46px, 6.5vw, 88px);
  padding-bottom: clamp(46px, 6.5vw, 88px);
}

.page-about .tl-banner {
  margin: 0 0 clamp(26px, 3.6vw, 46px);
  border: 1px solid var(--line);
  overflow: hidden;
  aspect-ratio: 2.7 / 1;
}
.page-about .tl-banner img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}
.page-about .tl-node {
  border-bottom: 1px solid var(--line);
  background: transparent;
  transition: background-color var(--t-fast);
}
.page-about .tl-node[open] {
  background: rgba(41, 224, 208, 0.05);
}
.page-about .tl-node > summary {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) 18px;
  gap: 6px 12px;
  align-items: center;
  padding: 16px 14px;
  cursor: pointer;
  list-style: none;
}
.page-about .tl-node > summary::-webkit-details-marker {
  display: none;
}
.page-about .tl-idx {
  grid-column: 1;
  grid-row: 1 / span 2;
  align-self: start;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  font-weight: 700;
  color: var(--c-steel);
  padding-top: 3px;
}
.page-about .tl-stage {
  grid-column: 2;
  grid-row: 1;
  justify-self: start;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: var(--c-cyan);
  border: 1px solid var(--line-cyan);
  padding: 3px 8px;
}
.page-about .tl-title {
  grid-column: 2;
  grid-row: 2;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--fg);
}
.page-about .tl-sign {
  grid-column: 3;
  grid-row: 1 / span 2;
  position: relative;
  justify-self: end;
  align-self: center;
  width: 14px;
  height: 14px;
}
.page-about .tl-sign::before,
.page-about .tl-sign::after {
  content: "";
  position: absolute;
  background: var(--c-steel);
  transition: transform var(--t-fast), background-color var(--t-fast);
}
.page-about .tl-sign::before {
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
  margin-top: -0.5px;
}
.page-about .tl-sign::after {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  margin-left: -0.5px;
}
.page-about .tl-node[open] .tl-sign::after {
  transform: scaleY(0);
}
.page-about .tl-node > summary:hover .tl-sign::before,
.page-about .tl-node > summary:hover .tl-sign::after {
  background: var(--c-cyan);
}
.page-about .tl-node[open] .tl-idx {
  color: var(--c-cyan);
}

@media (min-width: 820px) {
  .page-about .tl-node > summary {
    grid-template-columns: 56px 138px minmax(0, 1fr) 20px;
    gap: 0 18px;
    padding: 22px 18px;
  }
  .page-about .tl-idx {
    grid-column: 1;
    grid-row: 1;
    align-self: center;
    padding-top: 0;
    font-size: 14px;
  }
  .page-about .tl-stage {
    grid-column: 2;
    grid-row: 1;
    align-self: center;
  }
  .page-about .tl-title {
    grid-column: 3;
    grid-row: 1;
    align-self: center;
    font-size: 17px;
  }
  .page-about .tl-sign {
    grid-column: 4;
    grid-row: 1;
  }
}

.page-about .tl-body {
  padding: 0 14px 22px 14px;
  max-width: 74ch;
}
@media (min-width: 820px) {
  .page-about .tl-body {
    padding: 0 18px 26px 92px;
  }
}
.page-about .tl-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--fg-dim);
}
.page-about .tl-tags {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ============ 内容分类体系 ============ */
.page-about .about-system {
  background: var(--bg);
  border-bottom: 1px solid var(--line);
  padding-top: clamp(46px, 6.5vw, 88px);
  padding-bottom: clamp(46px, 6.5vw, 88px);
}

.page-about .sys-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap);
}
@media (min-width: 700px) {
  .page-about .sys-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .sys-figure {
    grid-column: 1 / -1;
  }
}

.page-about .sys-figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  overflow: hidden;
  min-height: 200px;
}
.page-about .sys-figure img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 200px;
  object-fit: cover;
}
.page-about .sys-figure .figure-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: 12px 14px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--fg-dim);
  background: linear-gradient(180deg, rgba(11, 27, 43, 0), rgba(11, 27, 43, 0.92));
}

.page-about .sys-card .card-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
}
.page-about .sys-card .card-body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--fg-dim);
}

@media (min-width: 1040px) {
  .page-about .sys-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
  .page-about .sys-figure {
    grid-column: 1 / span 3;
    grid-row: 1 / span 2;
    min-height: 0;
  }
  .page-about .sys-card--a {
    grid-column: 4 / span 3;
    grid-row: 1;
  }
  .page-about .sys-card--b {
    grid-column: 4 / span 3;
    grid-row: 2;
  }
  .page-about .sys-card--c {
    grid-column: 1 / span 2;
    grid-row: 3;
  }
  .page-about .sys-card--d {
    grid-column: 3 / span 2;
    grid-row: 3;
  }
  .page-about .sys-card--e {
    grid-column: 5 / span 2;
    grid-row: 3;
  }
}

/* 联赛标签条 */
.page-about .league-strip {
  margin-top: clamp(24px, 3.4vw, 42px);
  border: 1px solid var(--line);
  background: var(--bg-alt);
  padding: clamp(18px, 2.6vw, 30px);
}
.page-about .league-strip-title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.22em;
  color: var(--c-steel);
}
.page-about .league-tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-about .league-tag {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  min-width: 92px;
  padding: 9px 12px;
  border: 1px solid var(--line);
  background: rgba(58, 68, 72, 0.26);
  transition: border-color var(--t-fast), background-color var(--t-fast), transform var(--t-fast);
}
.page-about .league-tag:hover {
  border-color: var(--line-cyan);
  background: rgba(41, 224, 208, 0.08);
  transform: translateY(-2px);
}
.page-about .league-name {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--fg);
  line-height: 1.3;
}
.page-about .league-note {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.04em;
  color: var(--c-steel);
  line-height: 1.4;
  max-height: 26px;
  opacity: 1;
  overflow: hidden;
  transition: max-height var(--t-fast), opacity var(--t-fast);
}
@media (min-width: 760px) {
  .page-about .league-note {
    max-height: 0;
    opacity: 0;
  }
  .page-about .league-tag:hover .league-note,
  .page-about .league-tag:focus-within .league-note {
    max-height: 26px;
    opacity: 1;
  }
}

/* ============ 团队与运营 ============ */
.page-about .about-team {
  background: var(--bg-alt);
  border-bottom: 1px solid var(--line);
  padding-top: clamp(46px, 6.5vw, 88px);
  padding-bottom: clamp(46px, 6.5vw, 88px);
}
.page-about .team-banner {
  margin: 0 0 clamp(24px, 3.4vw, 42px);
  border: 1px solid var(--line);
  overflow: hidden;
  aspect-ratio: 2.7 / 1;
}
.page-about .team-banner img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap);
}
@media (min-width: 720px) {
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
.page-about .team-card {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  border: 1px solid var(--line);
  background: var(--bg);
  transition: border-color var(--t-fast), background-color var(--t-fast);
}
.page-about .team-card:hover,
.page-about .team-card:focus-within {
  border-color: var(--line-cyan);
  background: rgba(41, 224, 208, 0.05);
}
.page-about .team-card:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 2px;
}
.page-about .team-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 4.4vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--c-cyan);
}
.page-about .team-role {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
}
.page-about .team-line {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--c-steel);
  line-height: 1.6;
}
.page-about .team-more {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  margin-top: 0;
  transition: max-height 0.3s ease, opacity 0.3s ease, margin-top 0.3s ease;
}
.page-about .team-card:hover .team-more,
.page-about .team-card:focus-within .team-more {
  max-height: 260px;
  opacity: 1;
  margin-top: 14px;
}
.page-about .team-more p {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  font-size: 14px;
  line-height: 1.82;
  color: var(--fg-dim);
}
@media (hover: none) {
  .page-about .team-more {
    max-height: none;
    opacity: 1;
    margin-top: 14px;
  }
}

/* ============ 资质与合作 ============ */
.page-about .about-cred {
  background: var(--bg);
  border-bottom: 1px solid var(--line);
  padding-top: clamp(46px, 6.5vw, 88px);
  padding-bottom: clamp(46px, 6.5vw, 88px);
}
.page-about .cred-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap);
}
@media (min-width: 880px) {
  .page-about .cred-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
.page-about .cred-panel {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 2.6vw, 32px);
  border: 1px solid var(--line);
}
.page-about .cred-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.5;
  background-image: repeating-linear-gradient(0deg, var(--line-soft) 0 1px, transparent 1px 28px);
}
.page-about .cred-panel::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 58px;
  height: 2px;
}
.page-about .cred-panel > * {
  position: relative;
  z-index: 1;
}
.page-about .cred-panel--cert {
  background: linear-gradient(160deg, rgba(14, 42, 38, 0.96), rgba(11, 27, 43, 0.96));
}
.page-about .cred-panel--cert::after {
  background: var(--c-cyan);
}
.page-about .cred-panel--award {
  background: linear-gradient(160deg, rgba(180, 106, 74, 0.24), rgba(11, 27, 43, 0.94));
}
.page-about .cred-panel--award::after {
  background: var(--c-amber);
}
.page-about .cred-panel--partner {
  background: linear-gradient(160deg, rgba(58, 68, 72, 0.46), rgba(11, 27, 43, 0.94));
}
.page-about .cred-panel--partner::after {
  background: var(--c-moss);
}

.page-about .cred-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--c-steel);
}
.page-about .cred-panel h3 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(17px, 1.9vw, 20px);
  font-weight: 700;
  line-height: 1.4;
}
.page-about .cred-panel p {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--fg-dim);
}
.page-about .award-list,
.page-about .partner-stats {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .award-list li,
.page-about .partner-stats li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--fg-dim);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-soft);
}
.page-about .award-list li:last-child,
.page-about .partner-stats li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}
.page-about .award-list .mono,
.page-about .partner-stats .mono {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--c-amber);
}
.page-about .partner-stats .mono {
  color: var(--c-cyan);
  font-size: 16px;
}

/* ============ 更新节奏 ============ */
.page-about .about-cadence {
  background: var(--bg-alt);
  padding-top: clamp(46px, 6.5vw, 88px);
  padding-bottom: clamp(46px, 6.5vw, 88px);
}
.page-about .cadence-list {
  margin: 0;
  border-top: 1px solid var(--line);
}
.page-about .cd-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-soft);
  transition: background-color var(--t-fast);
}
@media (min-width: 760px) {
  .page-about .cd-row {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 26px;
    align-items: baseline;
    padding: 20px 14px;
  }
  .page-about .cd-row:hover {
    background: rgba(41, 224, 208, 0.05);
  }
}
.page-about .cd-row dt {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--c-amber);
}
.page-about .cd-row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--fg-dim);
}

/* ============ 继续浏览 ============ */
.page-about .about-next {
  background: var(--bg);
  padding-top: clamp(40px, 5vw, 72px);
  padding-bottom: clamp(48px, 6vw, 88px);
}
.page-about .next-inner {
  border: 1px solid var(--line);
  background:
    linear-gradient(118deg, rgba(41, 224, 208, 0.1) 0 32%, transparent 32%),
    var(--bg-alt);
  padding: clamp(24px, 3.6vw, 46px);
}
.page-about .next-inner h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 2.8vw, 30px);
  font-weight: 800;
  line-height: 1.25;
}
.page-about .next-lead {
  margin: 12px 0 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.82;
  color: var(--fg-dim);
}
.page-about .next-links {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}
@media (min-width: 760px) {
  .page-about .next-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
.page-about .next-links a {
  display: block;
  height: 100%;
  padding: 16px 18px;
  background: var(--bg);
  color: var(--fg);
  text-decoration: none;
  font-size: 14.5px;
  line-height: 1.65;
  transition: background-color var(--t-fast), color var(--t-fast);
}
.page-about .next-links a:hover,
.page-about .next-links a:focus-visible {
  background: rgba(41, 224, 208, 0.1);
  color: var(--c-cyan);
}