.page-about {
  --about-hair: rgba(237, 241, 247, .12);
  --about-hair-soft: rgba(237, 241, 247, .06);
  background: var(--nfs-indigo);
  color: var(--nfs-white);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--nfs-charcoal);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-hero-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .34;
}

.page-about .about-hero-scan {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background-image:
    radial-gradient(118% 88% at 6% 104%, rgba(5, 8, 15, .96) 0%, rgba(5, 8, 15, .62) 46%, rgba(5, 8, 15, .14) 100%),
    repeating-linear-gradient(0deg, var(--grid-cyan) 0 1px, transparent 1px 56px),
    repeating-linear-gradient(90deg, var(--grid-cyan) 0 1px, transparent 1px 56px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background-image: linear-gradient(102deg,
      rgba(240, 162, 44, 0) 0 65.9%,
      rgba(240, 162, 44, .18) 65.9% 66.1%,
      rgba(240, 162, 44, 0) 66.1% 100%);
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 3;
  padding-top: calc(var(--header-h) + 36px);
  padding-bottom: 44px;
}

.page-about .about-hero-copy {
  margin-top: clamp(72px, 17vh, 190px);
}

.page-about .about-eyebrow {
  margin: 0;
  font-size: 11.5px;
  letter-spacing: .2em;
  color: var(--nfs-cyan);
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  margin: 16px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(29px, 8.2vw, 76px);
  line-height: 1.08;
  letter-spacing: .04em;
  max-width: 15em;
  text-wrap: balance;
}

.page-about .about-lede {
  margin: 22px 0 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(237, 241, 247, .84);
}

.page-about .about-status {
  list-style: none;
  margin: 30px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--about-hair);
  display: grid;
  gap: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--nfs-mist);
}

.page-about .status-key {
  display: inline-block;
  margin-right: 10px;
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--nfs-amber);
}

/* ---------- 主体布局 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  padding-top: 52px;
  padding-bottom: 76px;
}

.page-about .about-rail {
  display: none;
}

.page-about .about-flow {
  display: grid;
  gap: 76px;
  min-width: 0;
}

/* ---------- 区块通用 ---------- */
.page-about .about-sec {
  min-width: 0;
}

.page-about .about-sec-head {
  display: grid;
  gap: 10px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-sec-num {
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--nfs-amber);
}

.page-about .about-h2 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(21px, 5.4vw, 34px);
  line-height: 1.16;
  letter-spacing: .035em;
  max-width: 24em;
}

.page-about .about-sec-lede {
  margin: 0;
  max-width: 60ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--nfs-mist);
}

.page-about .about-copy {
  margin-top: 26px;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(237, 241, 247, .86);
}

.page-about .about-copy p {
  margin: 0;
}

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

.page-about .about-copy a {
  color: var(--nfs-amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(240, 162, 44, .45);
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .about-copy a:hover,
.page-about .about-copy a:focus-visible {
  color: var(--nfs-amber-soft);
  border-bottom-color: var(--nfs-amber-soft);
}

/* ---------- 三组数字 ---------- */
.page-about .about-metrics {
  margin-top: 34px;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .metric {
  padding: 24px 0;
  border-bottom: 1px solid var(--about-hair-soft);
}

.page-about .metric-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--nfs-mist);
}

.page-about .metric-value {
  margin: 14px 0 0;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--nfs-amber);
  line-height: 1;
}

.page-about .metric-figure {
  font-size: clamp(32px, 8vw, 44px);
  letter-spacing: -.01em;
}

.page-about .metric-unit {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--nfs-mist);
}

.page-about .metric-note {
  margin: 12px 0 0;
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--nfs-mist);
}

/* ---------- 来源与复核 ---------- */
.page-about .about-split {
  margin-top: 30px;
  display: grid;
  gap: 30px;
}

.page-about .about-source-tabs {
  min-width: 0;
}

.page-about .about-source-tabs .tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .about-panel {
  margin-top: 22px;
}

.page-about .about-panel-title {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-size: 16.5px;
  font-weight: 900;
  letter-spacing: .05em;
  color: var(--nfs-white);
}

.page-about .about-panel-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(237, 241, 247, .84);
}

.page-about .about-panel-list li {
  padding-left: 14px;
  border-left: 1px solid var(--about-hair);
}

.page-about .panel-key {
  display: inline-block;
  margin-right: 8px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--nfs-cyan);
}

.page-about .about-panel-note {
  margin: 16px 0 0;
  padding: 12px 0 0;
  border-top: 1px solid var(--about-hair-soft);
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--nfs-mist);
}

.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--about-hair);
  filter: saturate(.85) brightness(.84);
}

.page-about .about-figure figcaption {
  margin-top: 12px;
  padding-left: 12px;
  border-left: 1px solid var(--nfs-cyan);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--nfs-mist);
}

.page-about .about-figure--wide {
  margin-top: 36px;
}

/* ---------- 双线示意 ---------- */
.page-about .dual-map {
  margin: 32px 0 0;
  padding: 22px 0 14px;
  border-top: 1px solid var(--about-hair);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .dual-track {
  position: relative;
  display: flex;
  align-items: center;
  height: 44px;
  min-width: 0;
}

.page-about .dual-track::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
}

.page-about .dual-track--coach::before {
  background-image: repeating-linear-gradient(90deg,
      var(--nfs-amber) 0 16px,
      rgba(240, 162, 44, 0) 16px 28px);
}

.page-about .dual-track--report::before {
  background-image: repeating-linear-gradient(90deg,
      var(--nfs-cyan) 0 5px,
      rgba(53, 224, 200, 0) 5px 24px);
}

.page-about .dual-track-label {
  position: relative;
  z-index: 1;
  padding-right: 14px;
  background: var(--nfs-indigo);
  font-size: 11.5px;
  letter-spacing: .12em;
  white-space: nowrap;
}

.page-about .dual-track--coach .dual-track-label {
  color: var(--nfs-amber);
}

.page-about .dual-track--report .dual-track-label {
  color: var(--nfs-cyan);
}

.page-about .dual-caption {
  margin: 6px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--nfs-mist);
}

/* ---------- 侧注 ---------- */
.page-about .about-aside {
  margin-top: 30px;
  padding: 18px 0 18px 18px;
  border-left: 1px solid var(--line-strong);
  max-width: 46ch;
}

.page-about .about-aside-title {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: 13.5px;
  font-weight: 900;
  letter-spacing: .08em;
  color: var(--nfs-white);
}

.page-about .about-aside-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--nfs-mist);
}

.page-about .about-aside-list li {
  position: relative;
  padding-left: 14px;
}

.page-about .about-aside-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 6px;
  height: 1px;
  background: var(--nfs-cyan);
}

.page-about .about-aside-note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--about-hair-soft);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--nfs-mist);
}

/* ---------- 外援名额 ---------- */
.page-about .about-quota {
  margin-top: 26px;
  display: grid;
  gap: 28px;
}

.page-about .about-quota-main {
  min-width: 0;
}

.page-about .about-quota-main .about-copy {
  margin-top: 0;
}

.page-about .about-aside--quota {
  margin-top: 0;
}

.page-about .about-aside-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-aside-stats li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--about-hair-soft);
}

.page-about .aside-num {
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--nfs-cyan);
}

.page-about .aside-unit {
  font-size: 12.5px;
  color: var(--nfs-mist);
  letter-spacing: .04em;
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-timeline {
  margin-top: 30px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 14px;
}

.page-about .ver-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 0;
  min-width: max-content;
}

.page-about .ver-item {
  position: relative;
  flex: 0 0 208px;
  padding: 28px 24px 22px 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .ver-item::before {
  content: "";
  position: absolute;
  top: -3px;
  left: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--nfs-amber);
}

.page-about .ver-item + .ver-item {
  padding-left: 24px;
}

.page-about .ver-no {
  display: block;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--nfs-amber);
}

.page-about .ver-name {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 900;
  letter-spacing: .05em;
  color: var(--nfs-white);
}

.page-about .ver-desc {
  margin: 10px 0 0;
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--nfs-mist);
}

.page-about .ver-era {
  display: inline-block;
  margin-top: 14px;
  padding: 3px 8px;
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-tag);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--nfs-mist);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .team-item {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--about-hair-soft);
}

.page-about .team-num {
  flex: 0 0 auto;
  min-width: 2.6em;
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  color: var(--nfs-amber);
  text-align: right;
}

.page-about .team-role {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(237, 241, 247, .82);
}

/* ---------- 尾段 ---------- */
.page-about .about-sec--tail .about-h2 {
  font-size: clamp(19px, 4.6vw, 28px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-lede {
    font-size: 16.5px;
  }

  .page-about .about-status {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px 28px;
  }

  .page-about .about-copy {
    font-size: 16px;
  }
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, .68fr);
    column-gap: 48px;
    align-items: start;
  }

  .page-about .about-quota {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, .85fr);
    column-gap: 48px;
    align-items: start;
  }

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

  .page-about .metric {
    padding: 26px 26px 26px 0;
    border-bottom: 0;
    border-right: 1px solid var(--about-hair);
  }

  .page-about .metric + .metric {
    padding-left: 26px;
  }

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

  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 40px;
  }

  .page-about .about-figure--wide img {
    max-height: 420px;
    object-fit: cover;
  }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: 196px minmax(0, 1fr);
    column-gap: 60px;
    padding-top: 84px;
    padding-bottom: 112px;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 40px);
    align-self: start;
    padding-left: 18px;
    border-left: 1px solid var(--about-hair);
  }

  .page-about .about-rail-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 20px;
  }

  .page-about .about-rail a {
    display: grid;
    grid-template-columns: 26px minmax(0, 1fr);
    gap: 8px;
    text-decoration: none;
    color: var(--nfs-mist);
    font-size: 13px;
    line-height: 1.45;
    transition: color .18s var(--ease);
  }

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

  .page-about .rail-num {
    font-size: 11px;
    letter-spacing: .08em;
    color: var(--nfs-amber);
  }

  .page-about .about-flow {
    gap: 118px;
  }

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

  .page-about .about-hero-copy {
    padding-bottom: 24px;
  }
}

@media (min-width: 1240px) {
  .page-about .about-status {
    column-gap: 40px;
  }

  .page-about .ver-item {
    flex: 0 0 232px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-copy a,
  .page-about .about-rail a {
    transition: none;
  }
}