.page-about {
  --about-cream-ink: rgba(26, 20, 16, .78);
  --about-rail-w: 116px;
  --about-gap: 56px;
  background: var(--sr-deep);
  color: var(--sr-silver);
}

/* ---------- 首屏 ---------- */

.page-about .about-open {
  position: relative;
  overflow: hidden;
  padding-block: calc(var(--sr-header-h) + 44px) 0;
}

.page-about .about-open::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(720px 400px at 82% 8%, rgba(122, 91, 224, .24), transparent 64%),
    radial-gradient(520px 320px at 8% 78%, rgba(47, 182, 198, .14), transparent 70%);
}

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

.page-about .about-open__title {
  font-family: var(--sr-display);
  font-size: clamp(2.4rem, 8.2vw, 5.2rem);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: .06em;
  color: var(--sr-white);
  margin: 18px 0 0;
  max-width: 17ch;
}

.page-about .about-open__lead {
  max-width: 64ch;
  margin-top: 24px;
  color: var(--sr-silver);
}

.page-about .about-open__facts {
  list-style: none;
  margin: 46px 0 0;
  padding: 24px 0 0;
  border-top: 1px solid var(--sr-line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 20px;
}

.page-about .about-open__facts li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-fact__num {
  font-family: var(--sr-mono);
  font-size: 1.65rem;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--sr-white);
}

.page-about .about-fact__label {
  font-size: var(--sr-fs-sm);
  color: var(--sr-dim);
}

.page-about .about-open__media {
  position: relative;
  z-index: 1;
  margin: 54px 0 0;
  aspect-ratio: 16 / 9;
  border-top: 1px solid var(--sr-line);
  border-bottom: 1px solid var(--sr-line);
}

.page-about .about-open__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.85) brightness(.9);
}

/* ---------- 章节骨架（观测日志） ---------- */

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

.page-about .about-log {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .about-rail {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .about-rail__bar {
  display: block;
  width: 34px;
  height: 1px;
  background: var(--sr-signal);
  flex: none;
}

.page-about .about-rail__tag {
  font-family: var(--sr-mono);
  font-size: var(--sr-fs-xs);
  letter-spacing: .22em;
  color: var(--sr-dim);
}

.page-about .about-h2 {
  margin: 0 0 20px;
  color: var(--sr-white);
}

.page-about .about-body .sr-text + .sr-text {
  margin-top: 16px;
}

.page-about .about-body .sr-note {
  margin-top: 22px;
}

/* ---------- 团队横幅 ---------- */

.page-about .about-photo {
  aspect-ratio: 16 / 10;
  border: 1px solid var(--sr-line);
  border-radius: var(--sr-radius);
  margin-bottom: 52px;
  background: var(--sr-night);
}

.page-about .about-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.8) brightness(.88);
}

.page-about .about-log--team {
  margin-top: 0;
}

/* ---------- 团队分工 ---------- */

.page-about .about-roster {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .about-roster__item {
  border: 1px solid var(--sr-line);
  border-radius: var(--sr-radius);
  padding: 20px 18px 22px;
  background: linear-gradient(180deg, rgba(14, 32, 56, .92), rgba(6, 17, 31, .92));
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: transform .18s var(--sr-ease), border-color .18s var(--sr-ease);
}

.page-about .about-roster__item::before {
  content: "";
  display: block;
  width: 100%;
  height: 2px;
  margin-bottom: 6px;
  background: var(--sr-lake);
}

.page-about .about-roster__item:nth-child(1)::before { background: var(--sr-signal); }
.page-about .about-roster__item:nth-child(2)::before { background: var(--sr-lake); }
.page-about .about-roster__item:nth-child(3)::before { background: var(--sr-dusk); }
.page-about .about-roster__item:nth-child(4)::before { background: var(--sr-silver); }

.page-about .about-roster__item:hover {
  transform: translateY(-2px);
  border-color: var(--sr-line-strong);
}

.page-about .about-roster__n {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  color: var(--sr-white);
}

.page-about .about-roster__name {
  font-family: var(--sr-display);
  font-size: var(--sr-fs-md);
  letter-spacing: .08em;
  color: var(--sr-silver);
}

.page-about .about-roster__desc {
  margin: 0;
  font-size: var(--sr-fs-sm);
  line-height: 1.7;
  color: var(--sr-dim);
}

/* ---------- 分类结构（奶油面板） ---------- */

.page-about .about-cream {
  background: var(--sr-cream);
  color: var(--sr-ink);
  border-radius: var(--sr-radius);
  padding: 30px 22px 34px;
  box-shadow: var(--sr-shadow);
}

.page-about .about-cream .about-rail__bar {
  background: var(--sr-press);
}

.page-about .about-cream .about-rail__tag {
  color: var(--sr-press);
}

.page-about .about-cream .about-h2 {
  color: var(--sr-ink);
}

.page-about .about-cream .sr-text {
  color: var(--about-cream-ink);
}

.page-about .about-method {
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
  margin-top: 30px;
}

.page-about .about-levels {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid rgba(196, 69, 31, .28);
}

.page-about .about-levels__item {
  display: grid;
  grid-template-columns: 42px 1fr;
  grid-template-areas:
    "key name"
    "key desc";
  gap: 2px 14px;
  padding: 14px 0;
  border-bottom: 1px dashed rgba(26, 20, 16, .2);
}

.page-about .about-levels__key {
  grid-area: key;
  align-self: center;
  font-size: var(--sr-fs-sm);
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--sr-press);
}

.page-about .about-levels__name {
  grid-area: name;
  font-family: var(--sr-display);
  font-size: var(--sr-fs-md);
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--sr-ink);
}

.page-about .about-levels__desc {
  grid-area: desc;
  font-size: var(--sr-fs-sm);
  line-height: 1.6;
  color: var(--about-cream-ink);
}

.page-about .about-levels__item--league .about-levels__key { color: var(--sr-dusk); }
.page-about .about-levels__item--season .about-levels__key { color: #1E7F8C; }
.page-about .about-levels__item--round .about-levels__key { color: var(--sr-signal); }
.page-about .about-levels__item--match .about-levels__key { color: var(--sr-press); }

.page-about .about-method__tail {
  margin-top: 20px;
}

.page-about .about-method__figure {
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-about .about-orbit {
  width: 100%;
  max-width: 400px;
  height: auto;
  display: block;
  overflow: visible;
}

.page-about .about-orbit__ring {
  cursor: pointer;
  outline: none;
}

.page-about .about-orbit__ring circle {
  fill: none;
  stroke-width: 1.5;
  stroke-dasharray: 3 7;
  opacity: .5;
  transition: opacity .2s var(--sr-ease), stroke-width .2s var(--sr-ease);
}

.page-about .about-orbit__ring text {
  font-family: var(--sr-mono);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: .16em;
  text-anchor: middle;
  fill: var(--sr-ink);
  transition: fill .2s var(--sr-ease);
}

.page-about .about-orbit__ring--league circle { stroke: var(--sr-dusk); }
.page-about .about-orbit__ring--season circle { stroke: #1E7F8C; }
.page-about .about-orbit__ring--round circle { stroke: var(--sr-signal); }
.page-about .about-orbit__ring--match circle { stroke: var(--sr-press); }

.page-about .about-orbit__ring:hover circle,
.page-about .about-orbit__ring:focus circle {
  opacity: 1;
  stroke-width: 3;
}

.page-about .about-orbit__ring:focus-visible circle {
  stroke-dasharray: none;
  outline: none;
}

.page-about .about-orbit__ring:focus-visible text {
  fill: var(--sr-press);
}

.page-about .about-orbit__ring:focus {
  outline: 2px solid var(--sr-lake);
  outline-offset: 4px;
  border-radius: 50%;
}

/* ---------- 历程 ---------- */

.page-about .about-era {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}

.page-about .about-tl {
  list-style: none;
  margin: 30px 0 0;
  padding: 0 0 0 42px;
  position: relative;
  border-left: 1px dashed var(--sr-line-strong);
}

.page-about .about-tl__node {
  position: relative;
  padding: 0 0 26px;
  outline: none;
}

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

.page-about .about-tl__node::before {
  content: "";
  position: absolute;
  left: -47px;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--sr-deep);
  border: 1.5px solid var(--sr-signal);
  transition: background .18s var(--sr-ease), box-shadow .18s var(--sr-ease);
}

.page-about .about-tl__node:hover::before,
.page-about .about-tl__node:focus::before {
  background: var(--sr-signal);
  box-shadow: 0 0 0 5px rgba(255, 107, 44, .18);
}

.page-about .about-tl__node:focus {
  outline: 2px solid var(--sr-lake);
  outline-offset: 6px;
  border-radius: 2px;
}

.page-about .about-tl__idx {
  display: block;
  font-size: var(--sr-fs-xs);
  letter-spacing: .2em;
  color: var(--sr-dim);
  margin-bottom: 6px;
}

.page-about .about-tl__title {
  margin: 0;
  font-family: var(--sr-display);
  font-size: var(--sr-fs-md);
  font-weight: 700;
  letter-spacing: .05em;
  line-height: 1.4;
  color: var(--sr-white);
}

.page-about .about-tl__more {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height .24s var(--sr-ease), opacity .2s var(--sr-ease), margin-top .24s var(--sr-ease);
}

.page-about .about-tl__more p {
  margin: 0;
  font-size: var(--sr-fs-sm);
  line-height: 1.75;
  color: var(--sr-silver);
}

.page-about .about-tl__node:hover .about-tl__more,
.page-about .about-tl__node:focus .about-tl__more,
.page-about .about-tl__node:focus-within .about-tl__more {
  max-height: 8rem;
  opacity: 1;
  margin-top: 8px;
}

.page-about .about-era__figure {
  aspect-ratio: 10 / 16;
  border: 1px solid var(--sr-line);
  border-radius: var(--sr-radius);
  background: var(--sr-night);
  margin: 0;
  max-width: 260px;
}

.page-about .about-era__figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .85;
}

/* ---------- 伙伴 ---------- */

.page-about .about-partners {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-partners__item {
  border: 1px solid var(--sr-line);
  border-left: 2px solid var(--sr-dusk);
  border-radius: var(--sr-radius);
  padding: 18px 20px;
  background: rgba(14, 32, 56, .55);
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: transform .18s var(--sr-ease), border-left-color .18s var(--sr-ease);
}

.page-about .about-partners__item:hover {
  transform: translateY(-2px);
  border-left-color: var(--sr-signal);
}

.page-about .about-partners__n {
  font-size: 1.85rem;
  font-weight: 700;
  line-height: 1;
  color: var(--sr-white);
}

.page-about .about-partners__name {
  font-family: var(--sr-display);
  font-size: var(--sr-fs-base);
  letter-spacing: .1em;
  color: var(--sr-lake);
}

.page-about .about-partners__desc {
  font-size: var(--sr-fs-sm);
  line-height: 1.7;
  color: var(--sr-dim);
}

/* ---------- 接下来 ---------- */

.page-about .about-next {
  border-top: 2px solid var(--sr-signal);
  padding: 28px 22px 30px;
}

.page-about .about-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .about-next__list li {
  position: relative;
  padding-left: 22px;
  font-size: var(--sr-fs-base);
  line-height: 1.75;
  color: var(--sr-silver);
}

.page-about .about-next__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 10px;
  height: 1px;
  background: var(--sr-signal);
}

.page-about .about-next__list a {
  color: var(--sr-lake);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about a:focus-visible {
  outline: 2px solid var(--sr-lake);
  outline-offset: 3px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 620px) {
  .page-about .about-open__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-cream {
    padding: 44px 40px 48px;
  }

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

  .page-about .about-next {
    padding: 36px 34px 38px;
  }
}

@media (min-width: 860px) {
  .page-about .about-roster {
    flex-direction: row;
    align-items: stretch;
    gap: 10px;
  }

  .page-about .about-roster__item {
    flex-basis: 0;
    min-width: 0;
  }

  .page-about .about-roster__item:nth-child(1) { flex-grow: 7; }
  .page-about .about-roster__item:nth-child(2) { flex-grow: 5; }
  .page-about .about-roster__item:nth-child(3) { flex-grow: 3; }
  .page-about .about-roster__item:nth-child(4) { flex-grow: 3; }
}

@media (min-width: 900px) {
  .page-about .about-chapter {
    padding-block: 104px;
  }

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

  .page-about .about-rail {
    display: block;
    position: relative;
    min-height: 100%;
    padding-left: 24px;
  }

  .page-about .about-rail__bar {
    position: absolute;
    left: 0;
    top: 6px;
    bottom: 6px;
    width: 1px;
    height: auto;
    background-image: linear-gradient(to bottom, var(--sr-line-strong), rgba(201, 214, 228, .06));
    background-color: transparent;
  }

  .page-about .about-rail__tag {
    writing-mode: vertical-rl;
    letter-spacing: .34em;
    padding-top: 2px;
  }

  .page-about .about-cream .about-rail__bar {
    background-image: linear-gradient(to bottom, rgba(196, 69, 31, .45), rgba(196, 69, 31, .08));
  }

  .page-about .about-open__facts {
    margin-top: 56px;
  }

  .page-about .about-open__media {
    margin-top: 68px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-method {
    grid-template-columns: minmax(0, 1fr) minmax(0, .9fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-era {
    grid-template-columns: minmax(0, 1fr) 250px;
    gap: 48px;
    align-items: start;
  }

  .page-about .about-era__figure {
    position: sticky;
    top: calc(var(--sr-header-h) + 24px);
    max-width: none;
  }
}

@media (max-width: 899px) {
  .page-about .about-tl__more {
    max-height: 12rem;
    opacity: 1;
    margin-top: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-roster__item,
  .page-about .about-partners__item,
  .page-about .about-tl__node::before,
  .page-about .about-orbit__ring circle,
  .page-about .about-tl__more {
    transition: none;
  }

  .page-about .about-roster__item:hover,
  .page-about .about-partners__item:hover {
    transform: none;
  }
}
</main>