.page-about {
  background: var(--bg);
  color: var(--ice);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 28px 0 54px;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(115% 88% at 84% 0%, rgba(79, 209, 255, 0.1), transparent 58%),
    radial-gradient(78% 66% at 0% 100%, rgba(43, 255, 136, 0.07), transparent 62%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(36, 51, 76, 0.5) 1px, transparent 1px),
    linear-gradient(90deg, rgba(36, 51, 76, 0.5) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 84%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 84%);
}

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

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  gap: 40px;
  align-items: end;
  margin-top: 26px;
}

.page-about .about-hero__kicker {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--green);
  margin: 0;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 5vw, 56px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  margin: 14px 0 18px;
  color: var(--ice);
}

.page-about .about-hero__mark {
  position: relative;
  white-space: nowrap;
  background-image: linear-gradient(180deg, transparent 66%, rgba(43, 255, 136, 0.32) 66%);
  background-repeat: no-repeat;
  background-size: 100% 100%;
}

.page-about .about-hero__figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-hero__fig {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  background: var(--panel);
}

.page-about .about-hero__figv {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 28px;
  line-height: 1;
  color: var(--green);
  letter-spacing: -0.01em;
}

.page-about .about-hero__figk {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* ---------- 竖向年份走道 ---------- */
.page-about .walk {
  padding: 8px 0 88px;
}

.page-about .walk__beat {
  position: relative;
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr) 236px;
  gap: 0 30px;
  padding: 0 0 72px;
}

.page-about .walk__beat--last {
  padding-bottom: 0;
}

.page-about .walk__rail {
  position: relative;
  grid-column: 1;
}

.page-about .walk__rail::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 10px;
  bottom: -72px;
  width: 1px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, var(--line) 0%, var(--line) 82%, transparent 100%);
}

.page-about .walk__beat--last .walk__rail::before {
  bottom: auto;
  height: 26px;
}

.page-about .walk__dot {
  position: absolute;
  left: 50%;
  top: 9px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 1px solid var(--green);
  background: var(--bg);
  transform: translate(-50%, 0);
  transition: transform 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .walk__beat:hover .walk__dot,
.page-about .walk__beat:focus-within .walk__dot {
  background: var(--green);
  transform: translate(-50%, 0) scale(1.45);
  box-shadow: 0 0 0 6px rgba(43, 255, 136, 0.12);
}

.page-about .walk__main {
  grid-column: 2;
  min-width: 0;
}

.page-about .walk__tag {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
  margin: 0;
  transition: color 0.2s ease;
}

.page-about .walk__beat:hover .walk__tag {
  color: var(--green);
}

.page-about .walk__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--ice);
  margin: 8px 0 16px;
}

.page-about .walk__main > p {
  color: var(--ice);
  opacity: 0.82;
  font-size: 16px;
  line-height: 1.78;
  max-width: 62ch;
  margin: 0 0 14px;
}

.page-about .walk__aside {
  grid-column: 3;
  align-self: start;
  padding-left: 20px;
  border-left: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .walk__asidek {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .walk__asidev {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 34px;
  line-height: 1.1;
  color: var(--amber);
  letter-spacing: -0.01em;
}

.page-about .walk__asided {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .walk__link {
  color: var(--ice);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 1px;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-about .walk__link:hover {
  color: var(--green);
  border-color: var(--green);
}

.page-about .walk__link:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ---------- 图 ---------- */
.page-about .beat__figure {
  grid-column: 2 / -1;
  margin: 24px 0 0;
}

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

.page-about .beat__figure .media__inner img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .beat__figure .media__caption {
  margin-top: 10px;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* ---------- 团队分工 ---------- */
.page-about .crew {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  max-width: 62ch;
}

.page-about .crew__card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 6px 12px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  outline: none;
  transition: border-color 0.18s ease, background-color 0.18s ease;
}

.page-about .crew__card:hover {
  border-color: #33465f;
  background: var(--lift);
}

.page-about .crew__card:focus-visible {
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(43, 255, 136, 0.16);
}

.page-about .crew__role {
  font-size: 15px;
  color: var(--ice);
  letter-spacing: 0.02em;
}

.page-about .crew__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  line-height: 1;
  color: var(--green);
}

.page-about .crew__desc {
  grid-column: 1 / -1;
  font-size: 13px;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 赛季三阶段 ---------- */
.page-about .phases {
  display: grid;
  gap: 10px;
  margin: 22px 0 0;
  max-width: 62ch;
}

.page-about .phase {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.page-about .phase[open] {
  border-color: rgba(43, 255, 136, 0.4);
  background: var(--lift);
}

.page-about .phase__sum {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .phase__sum::-webkit-details-marker {
  display: none;
}

.page-about .phase__sum:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: -2px;
}

.page-about .phase__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex: none;
}

.page-about .phase__dot--calm {
  background: var(--cyan);
}

.page-about .phase__dot--dense {
  background: var(--amber);
}

.page-about .phase__dot--final {
  background: var(--green);
}

.page-about .phase__name {
  flex: 1;
  font-size: 15px;
  color: var(--ice);
}

.page-about .phase__meta {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .phase__body {
  padding: 0 16px 16px;
}

.page-about .phase__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
  max-width: 58ch;
}

/* ---------- 四道关 ---------- */
.page-about .gates {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .gates__item {
  background: var(--bg);
  padding: 18px 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .gates__idx {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .gates__h {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--ice);
  letter-spacing: 0.02em;
}

.page-about .gates__item p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 分组方式 ---------- */
.page-about .grp {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.page-about .grp__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--lift);
}

.page-about .grp__k {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--green);
}

.page-about .grp__v {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 年份演进 ---------- */
.page-about .ms-line {
  display: block;
  width: 100%;
  max-width: 720px;
  height: auto;
  margin: 24px 0 6px;
}

.page-about .ms-line__rule {
  stroke: var(--line);
  stroke-width: 1;
}

.page-about .ms-line__node {
  fill: var(--bg);
  stroke: var(--green);
  stroke-width: 1.5;
}

.page-about .ms-line__year {
  fill: var(--mist);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-anchor: middle;
}

.page-about .ms-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: 62ch;
}

.page-about .ms {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 20px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

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

.page-about .ms__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 22px;
  line-height: 1.2;
  color: var(--amber);
  letter-spacing: 0.01em;
}

.page-about .ms__text {
  color: var(--ice);
  opacity: 0.82;
  font-size: 14.5px;
  line-height: 1.78;
}

/* ---------- 结尾行动 ---------- */
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .page-about .walk__beat {
    grid-template-columns: 56px minmax(0, 1fr) 200px;
    gap: 0 22px;
  }

  .page-about .walk__asidev {
    font-size: 28px;
  }
}

@media (max-width: 900px) {
  .page-about .about-hero {
    padding: 22px 0 42px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 30px;
    align-items: start;
  }

  .page-about .walk__beat {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 0 18px;
    padding-bottom: 56px;
  }

  .page-about .walk__rail::before {
    bottom: -56px;
  }

  .page-about .walk__aside {
    grid-column: 2;
    margin-top: 18px;
    padding-left: 0;
    border-left: 0;
    flex-direction: row;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 10px;
  }

  .page-about .walk__asidev {
    font-size: 26px;
  }

  .page-about .beat__figure {
    grid-column: 2;
    margin-top: 20px;
  }

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

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

@media (max-width: 620px) {
  .page-about .about-hero__figv {
    font-size: 24px;
  }

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

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

  .page-about .ms {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }

  .page-about .ms-line {
    margin-top: 18px;
  }

  .page-about .walk {
    padding-bottom: 64px;
  }

  .page-about .walk__beat {
    grid-template-columns: 26px minmax(0, 1fr);
    gap: 0 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .walk__dot,
  .page-about .walk__tag,
  .page-about .crew__card,
  .page-about .walk__link {
    transition: none;
  }

  .page-about .walk__beat:hover .walk__dot,
  .page-about .walk__beat:focus-within .walk__dot {
    transform: translate(-50%, 0);
    box-shadow: none;
  }
}