.page-about {
  --about-card: rgba(14, 22, 32, 0.9);
  --about-card-soft: rgba(14, 22, 32, 0.5);
  --about-glow-cyan: rgba(38, 240, 224, 0.16);
  --about-glow-orange: rgba(255, 91, 31, 0.14);
  --about-stroke-cyan: rgba(38, 240, 224, 0.55);
  background-color: var(--c-ink);
  color: var(--c-white);
}

.page-about h2,
.page-about h3 {
  color: var(--c-white);
}

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0 0 18px;
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: var(--c-steel);
}

.page-about .breadcrumbs a {
  color: var(--c-steel);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.page-about .breadcrumbs a:hover {
  color: var(--c-cyan);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: 18px 0 34px;
  background:
    radial-gradient(120% 90% at 88% -20%, var(--about-glow-cyan), transparent 62%),
    radial-gradient(90% 80% at -5% 110%, var(--about-glow-orange), transparent 65%),
    var(--c-ink);
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-hero__frame {
  position: relative;
  border: 1px solid var(--c-line);
  background: linear-gradient(180deg, var(--about-card), rgba(7, 11, 16, 0.72));
  padding: 14px 14px 22px;
  overflow: hidden;
}

.page-about .about-hero__frame::before,
.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  width: 26px;
  height: 26px;
  border: 2px solid var(--c-cyan);
  pointer-events: none;
  z-index: 2;
}

.page-about .about-hero__frame::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .about-hero__frame::after {
  bottom: -1px;
  right: -1px;
  border-left: 0;
  border-top: 0;
}

.page-about .about-hero__media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--c-line);
  margin-bottom: 18px;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.06);
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(7, 11, 16, 0.12), rgba(7, 11, 16, 0.74));
  pointer-events: none;
}

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

.page-about .about-hero__body .eyebrow {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--c-cyan);
}

.page-about .about-hero h1 {
  margin: 0;
  max-width: 20ch;
  font-size: clamp(1.75rem, 6.2vw, 3rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
  font-weight: 800;
}

.page-about .about-hero__lede {
  margin: 14px 0 20px;
  max-width: 60ch;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--c-steel);
}

.page-about .about-marks {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(88px, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--c-line);
  border: 1px solid var(--c-line);
}

.page-about .about-marks li {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 12px 14px;
  background: var(--about-card);
}

.page-about .about-marks__num {
  font-family: var(--font-mono);
  font-size: var(--fs-24);
  line-height: 1;
  color: var(--c-cyan);
  letter-spacing: 0.02em;
}

.page-about .about-marks__key {
  font-size: var(--fs-12);
  color: var(--c-steel);
  letter-spacing: 0.06em;
}

/* ---------- 章节轨道 ---------- */

.page-about .about-jump {
  background: rgba(7, 11, 16, 0.94);
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-jump__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 10px 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-jump__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-jump__list a {
  display: inline-block;
  white-space: nowrap;
  padding: 7px 14px;
  border: 1px solid var(--c-line);
  border-radius: 999px;
  color: var(--c-steel);
  font-size: var(--fs-14);
  text-decoration: none;
  transition: color 0.2s var(--ease), background 0.2s var(--ease),
    border-color 0.2s var(--ease);
}

.page-about .about-jump__list a:hover,
.page-about .about-jump__list a.is-active {
  color: var(--c-ink);
  background: var(--c-cyan);
  border-color: var(--c-cyan);
}

/* ---------- 章节通用 ---------- */

.page-about .about-chapter {
  position: relative;
  padding: 44px 0;
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-chapter::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 96px;
  height: 2px;
  background: linear-gradient(90deg, var(--c-cyan), var(--c-orange));
}

.page-about .about-chapter__head {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 22px;
}

.page-about .about-chapter__head h2 {
  margin: 0;
  font-size: clamp(1.35rem, 4.8vw, var(--fs-32));
  line-height: 1.26;
  letter-spacing: -0.01em;
  font-weight: 800;
  max-width: 24ch;
}

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

.page-about .chapter__num {
  font-family: var(--font-mono);
  font-size: var(--fs-24);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--c-cyan);
}

@supports (-webkit-text-stroke: 1px #000) {
  .page-about .chapter__num {
    color: transparent;
    -webkit-text-stroke: 1px var(--c-cyan);
  }
}

.page-about .chapter__label {
  font-size: var(--fs-12);
  letter-spacing: 0.2em;
  color: var(--c-steel);
}

.page-about .about-lead {
  margin: 0 0 22px;
  max-width: 66ch;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--c-steel);
}

.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-about .about-chapter__lead p {
  margin: 0 0 14px;
  font-size: var(--fs-16);
  line-height: 1.82;
  color: var(--c-steel);
}

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

.page-about .about-sideline {
  border: 1px solid var(--c-line);
  border-left: 2px solid var(--c-orange);
  background: var(--c-glass-2);
  padding: 16px 18px;
}

.page-about .about-sideline__title {
  margin: 0 0 10px;
  font-size: var(--fs-14);
  font-weight: 700;
  color: var(--c-orange-glow);
  letter-spacing: 0.04em;
}

.page-about .about-sideline ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-sideline li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 9px;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--c-white);
}

.page-about .about-sideline li:last-child {
  margin-bottom: 0;
}

.page-about .about-sideline li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  background: var(--c-cyan);
  transform: rotate(45deg);
}

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: 0 0 24px;
  border: 1px solid var(--c-line);
  background: var(--about-card-soft);
  padding: 8px;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-figure figcaption {
  margin-top: 8px;
  font-size: var(--fs-12);
  color: var(--c-steel);
  letter-spacing: 0.04em;
}

/* ---------- 时间轴 ---------- */

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

.page-about .timeline__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
}

.page-about .timeline__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-24);
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--c-cyan);
}

.page-about .timeline__card {
  border: 1px solid var(--c-line);
  background: linear-gradient(160deg, var(--about-card), rgba(7, 11, 16, 0.82));
  padding: 16px;
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease),
    background 0.25s var(--ease);
}

.page-about .timeline__card h3 {
  margin: 0 0 8px;
  font-size: var(--fs-18);
  line-height: 1.4;
  font-weight: 700;
}

.page-about .timeline__card p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.78;
  color: var(--c-steel);
}

.page-about .timeline__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline__item:hover .timeline__card,
.page-about .timeline__item:focus-within .timeline__card {
  border-color: var(--about-stroke-cyan);
  transform: translateY(-2px);
}

.page-about .about-inline-link {
  margin: 22px 0 0;
  font-size: var(--fs-14);
  color: var(--c-steel);
}

.page-about .about-inline-link a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(38, 240, 224, 0.4);
  padding-bottom: 1px;
}

.page-about .about-inline-link a:hover {
  color: var(--c-cyan-mist);
  border-bottom-color: var(--c-cyan-mist);
}

/* ---------- 球队库 ---------- */

.page-about .squad-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--c-line);
  border: 1px solid var(--c-line);
}

.page-about .squad-grid li {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 14px;
  background: var(--about-card);
  font-size: var(--fs-14);
  color: var(--c-white);
  line-height: 1.5;
}

.page-about .squad-grid__num {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--c-orange);
  letter-spacing: 0.1em;
}

.page-about .squad-notes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: 16px;
}

.page-about .squad-notes__item {
  border: 1px dashed var(--c-line);
  background: var(--c-glass-2);
  padding: 14px 16px;
}

.page-about .squad-notes__title {
  margin: 0 0 6px;
  font-size: var(--fs-14);
  font-weight: 700;
  color: var(--c-cyan-mist);
  letter-spacing: 0.04em;
}

.page-about .squad-notes__item p:last-child {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.76;
  color: var(--c-steel);
}

/* ---------- 同步与审核 ---------- */

.page-about .sync-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--c-line);
}

.page-about .sync-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--c-line);
}

.page-about .sync-list__key {
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  color: var(--c-cyan);
  letter-spacing: 0.06em;
}

.page-about .sync-list__val {
  font-size: var(--fs-14);
  line-height: 1.76;
  color: var(--c-steel);
}

.page-about .audit {
  margin-top: 24px;
  border: 1px solid var(--c-line);
  background: var(--about-card-soft);
  padding: 18px 16px;
}

.page-about .audit__title {
  margin: 0 0 14px;
  font-size: var(--fs-16);
  font-weight: 700;
  color: var(--c-white);
}

.page-about .audit-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: audit;
}

.page-about .audit-steps li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-left: 14px;
  border-left: 2px solid var(--c-orange);
}

.page-about .audit-steps__num {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--c-orange-glow);
  letter-spacing: 0.14em;
}

.page-about .audit-steps strong {
  font-size: var(--fs-14);
  color: var(--c-white);
}

.page-about .audit-steps span:last-child {
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--c-steel);
}

/* ---------- 团队 ---------- */

.page-about .team-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-about .team-split__text p {
  margin: 0 0 14px;
  font-size: var(--fs-16);
  line-height: 1.82;
  color: var(--c-steel);
}

.page-about .team-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  background: var(--c-line);
  border: 1px solid var(--c-line);
}

.page-about .team-stats li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 14px;
  background: var(--about-card);
}

.page-about .team-stats__num {
  font-family: var(--font-mono);
  font-size: var(--fs-24);
  line-height: 1;
  color: var(--c-cyan);
}

.page-about .team-stats__key {
  font-size: var(--fs-12);
  color: var(--c-steel);
  letter-spacing: 0.05em;
}

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

/* ---------- 服务与认可 ---------- */

.page-about .reach-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .reach-card {
  border: 1px solid var(--c-line);
  background: linear-gradient(150deg, rgba(38, 240, 224, 0.08), transparent 70%), var(--about-card);
  padding: 16px;
}

.page-about .reach-card__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-32);
  line-height: 1;
  color: var(--c-cyan);
  letter-spacing: -0.01em;
}

.page-about .reach-card__key {
  margin: 8px 0 0;
  font-size: var(--fs-14);
  color: var(--c-white);
  letter-spacing: 0.05em;
}

.page-about .reach-card__desc {
  margin: 10px 0 0;
  font-size: var(--fs-14);
  line-height: 1.76;
  color: var(--c-steel);
}

.page-about .reach-notes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 18px;
}

.page-about .reach-notes__item {
  border-top: 1px solid var(--c-line);
  padding-top: 14px;
}

.page-about .reach-notes__title {
  margin: 0 0 8px;
  font-size: var(--fs-14);
  font-weight: 700;
  color: var(--c-orange-glow);
  letter-spacing: 0.04em;
}

.page-about .reach-notes__item p:last-child {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.78;
  color: var(--c-steel);
}

/* ---------- 收尾 ---------- */

.page-about .about-next {
  padding: 42px 0 54px;
  background:
    radial-gradient(100% 130% at 15% 0%, var(--about-glow-cyan), transparent 62%),
    var(--c-ink-2);
}

.page-about .about-next h2 {
  margin: 0 0 20px;
  font-size: clamp(1.3rem, 4.6vw, var(--fs-24));
  line-height: 1.32;
  font-weight: 800;
  max-width: 26ch;
}

.page-about .about-next__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-next__grid a {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px;
  border: 1px solid var(--c-line);
  background: var(--c-glass-2);
  text-decoration: none;
  transition: border-color 0.24s var(--ease), background 0.24s var(--ease),
    transform 0.24s var(--ease);
}

.page-about .about-next__grid a:hover {
  border-color: var(--about-stroke-cyan);
  background: rgba(38, 240, 224, 0.07);
  transform: translateY(-2px);
}

.page-about .about-next__label {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--c-orange);
}

.page-about .about-next__title {
  font-size: var(--fs-16);
  font-weight: 700;
  line-height: 1.5;
  color: var(--c-white);
}

.page-about .about-next__note {
  margin: 18px 0 0;
  font-size: var(--fs-14);
  color: var(--c-steel);
}

.page-about .about-next__note a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(38, 240, 224, 0.4);
}

.page-about .about-next__note a:hover {
  color: var(--c-cyan-mist);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-hero {
    padding: 24px 0 44px;
  }

  .page-about .about-hero__frame {
    padding: 18px 18px 26px;
  }

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

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

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

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

@media (min-width: 768px) {
  .page-about .about-hero__frame {
    padding: 22px 22px 30px;
  }

  .page-about .about-chapter {
    padding: 60px 0;
  }

  .page-about .about-chapter::before {
    width: 140px;
  }

  .page-about .about-chapter__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .about-lead {
    font-size: var(--fs-18);
  }

  .page-about .timeline {
    position: relative;
    gap: 22px;
  }

  .page-about .timeline::before {
    content: "";
    position: absolute;
    left: 124px;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: linear-gradient(
      180deg,
      var(--c-cyan),
      rgba(38, 240, 224, 0.35) 52%,
      var(--c-orange)
    );
  }

  .page-about .timeline__item {
    grid-template-columns: 110px minmax(0, 1fr);
    gap: 0 28px;
  }

  .page-about .timeline__marker {
    text-align: right;
    padding-top: 6px;
  }

  .page-about .timeline__year {
    font-size: var(--fs-48);
    letter-spacing: 0.02em;
  }

  .page-about .timeline__card {
    padding: 18px 20px;
  }

  .page-about .squad-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .sync-list li {
    grid-template-columns: 140px minmax(0, 1fr);
    gap: 28px;
    align-items: baseline;
  }

  .page-about .team-split {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 32px;
    align-items: start;
  }

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

  .page-about .reach-grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr) minmax(0, 1fr);
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero {
    padding: 30px 0 56px;
  }

  .page-about .about-hero__frame {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: 28px;
    align-items: stretch;
    padding: 26px 26px 30px;
  }

  .page-about .about-hero__media {
    margin-bottom: 0;
    height: 100%;
  }

  .page-about .about-hero__media img {
    height: 100%;
    aspect-ratio: auto;
    min-height: 320px;
  }

  .page-about .about-hero h1 {
    font-size: var(--fs-48);
  }

  .page-about .about-chapter {
    padding: 72px 0;
  }

  .page-about .about-chapter__head {
    flex-direction: row;
    align-items: baseline;
    justify-content: flex-start;
    gap: 22px;
  }

  .page-about .about-chapter__head h2 {
    font-size: var(--fs-32);
    max-width: none;
  }

  .page-about .chapter {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    min-width: 120px;
  }
}

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

  .page-about .timeline__item:hover .timeline__card,
  .page-about .timeline__item:focus-within .timeline__card,
  .page-about .about-next__grid a:hover {
    transform: none;
  }
}