.page-about {
  --about-line: var(--sk-grid);
  --about-pad: clamp(20px, 4vw, 56px);
  background: var(--sk-void);
  color: var(--sk-ice);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .sk-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  padding-block: 16px;
  font-family: var(--sk-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--sk-mist);
}

.page-about .sk-breadcrumb a {
  color: var(--sk-cyan);
  text-decoration: none;
}

.page-about .sk-breadcrumb a:hover,
.page-about .sk-breadcrumb a:focus-visible {
  text-decoration: underline;
}

.page-about .sk-breadcrumb [aria-current="page"] {
  color: var(--sk-ice);
}

/* ---------- 首屏 ---------- */
.page-about .brand-hero {
  position: relative;
  display: grid;
  gap: clamp(16px, 2.4vw, 24px);
  padding-block: clamp(22px, 4vw, 44px) clamp(28px, 5vw, 52px);
  border-top: 2px solid var(--sk-cyan);
  border-bottom: 1px solid var(--about-line);
  overflow: hidden;
}

.page-about .brand-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--about-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--about-line) 1px, transparent 1px);
  background-size: 84px 84px;
  opacity: 0.32;
  pointer-events: none;
}

.page-about .brand-hero > * {
  position: relative;
  z-index: 1;
}

.page-about .brand-hero .sk-h1 {
  margin: 0;
  max-width: 20ch;
  font-family: var(--sk-display);
  font-weight: 800;
  font-size: clamp(32px, 6vw, 60px);
  line-height: 1.08;
  letter-spacing: -0.02em;
}

.page-about .brand-hero__lede {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.75;
  color: var(--sk-mist);
}

.page-about .brand-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .brand-facts {
  display: grid;
  gap: 14px 20px;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  margin: 0;
  padding-top: 18px;
  border-top: 1px solid var(--about-line);
}

.page-about .brand-facts__item dt {
  font-family: var(--sk-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--sk-mist);
}

.page-about .brand-facts__item dd {
  margin: 6px 0 0;
  font-family: var(--sk-display);
  font-weight: 800;
  font-size: clamp(18px, 2.2vw, 24px);
  line-height: 1.2;
}

.page-about .brand-facts__item dd .sk-num {
  color: var(--sk-cyan);
  font-family: var(--sk-mono);
  font-weight: 700;
}

/* ---------- 主体网格 ---------- */
.page-about .brand-body {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  padding-top: clamp(28px, 4vw, 56px);
}

.page-about .brand-index {
  display: grid;
  gap: 12px;
  padding: 14px;
  background: var(--sk-cabin);
  border: 1px solid var(--about-line);
}

.page-about .brand-index__kicker {
  margin: 0;
  font-family: var(--sk-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--sk-mist);
}

.page-about .brand-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .brand-index__list li {
  flex: 0 0 auto;
}

.page-about .brand-index__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 11px;
  border: 1px solid var(--about-line);
  color: var(--sk-mist);
  font-size: 13px;
  white-space: nowrap;
  text-decoration: none;
  transition: color 0.16s ease, border-color 0.16s ease, background-color 0.16s ease;
}

.page-about .brand-index__list a .sk-num {
  font-family: var(--sk-mono);
  font-size: 12px;
  color: var(--sk-cyan);
}

.page-about .brand-index__list a:hover,
.page-about .brand-index__list a:focus-visible {
  color: var(--sk-ice);
  border-color: var(--sk-cyan);
  background: var(--sk-deck);
}

.page-about .brand-index__cta {
  display: none;
  color: var(--sk-cyan);
  font-family: var(--sk-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-decoration: none;
  border-top: 1px solid var(--about-line);
  padding-top: 12px;
}

.page-about .brand-index__cta:hover,
.page-about .brand-index__cta:focus-visible {
  text-decoration: underline;
}

/* ---------- 章节 ---------- */
.page-about .brand-chapter {
  scroll-margin-top: 96px;
  padding-top: clamp(20px, 3vw, 30px);
  border-top: 1px solid var(--about-line);
}

.page-about .brand-chapter + .brand-chapter {
  margin-top: clamp(40px, 6vw, 76px);
}

.page-about .brand-chapter__num {
  margin: 0;
  font-family: var(--sk-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--sk-cyan);
}

.page-about .brand-chapter .sk-h2 {
  margin: 8px 0 0;
  font-family: var(--sk-display);
  font-weight: 800;
  font-size: clamp(23px, 3.4vw, 36px);
  line-height: 1.18;
  letter-spacing: -0.015em;
  max-width: 22ch;
}

.page-about .brand-chapter p {
  margin: 14px 0 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--sk-mist);
}

.page-about .brand-chapter p strong {
  color: var(--sk-ice);
  font-weight: 700;
}

/* ---------- 路径示意图 ---------- */
.page-about .brand-path {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 10px;
  margin-top: 22px;
}

.page-about .brand-path__node {
  flex: 1 1 150px;
  display: grid;
  gap: 6px;
  padding: 14px;
  background: var(--sk-deck);
  border: 1px solid var(--about-line);
  box-shadow: 4px 4px 0 rgba(56, 242, 208, 0.1);
}

.page-about .brand-path__node--accent {
  border-color: var(--sk-cyan);
  background: var(--sk-cabin);
}

.page-about .brand-path__k {
  font-family: var(--sk-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--sk-mist);
}

.page-about .brand-path__node--accent .brand-path__k {
  color: var(--sk-cyan);
}

.page-about .brand-path__t {
  font-family: var(--sk-display);
  font-weight: 800;
  font-size: 16px;
  line-height: 1.3;
}

.page-about .brand-path__arrow {
  align-self: center;
  color: var(--sk-cyan);
  font-family: var(--sk-mono);
  font-size: 16px;
}

/* ---------- 图像 ---------- */
.page-about .brand-figure {
  margin: 24px 0 0;
  border: 1px solid var(--about-line);
  background: var(--sk-deck);
  overflow: hidden;
}

.page-about .brand-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .brand-figure .sk-media__caption {
  padding: 9px 12px;
  border-top: 1px solid var(--about-line);
  font-family: var(--sk-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--sk-mist);
}

/* ---------- 联赛版图 ---------- */
.page-about .brand-leagues {
  display: grid;
  gap: 12px;
  margin-top: 22px;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.page-about .brand-league {
  padding: 16px;
  background: var(--sk-cabin);
  border: 1px solid var(--about-line);
  transition: transform 0.16s ease, border-color 0.16s ease;
}

.page-about .brand-league:hover {
  transform: translateY(-2px);
  border-color: var(--sk-cyan);
}

.page-about .brand-league__t {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--about-line);
  font-family: var(--sk-display);
  font-weight: 800;
  font-size: 17px;
}

.page-about .brand-league__n {
  font-family: var(--sk-mono);
  font-size: 20px;
  color: var(--sk-purple);
}

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

.page-about .brand-league__list li {
  padding: 4px 8px;
  border: 1px solid var(--about-line);
  font-size: 12.5px;
  color: var(--sk-mist);
  letter-spacing: 0.02em;
}

/* ---------- 时间线 ---------- */
.page-about .brand-timeline {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .brand-node {
  position: relative;
  padding: 0 0 26px 26px;
  border-left: 2px solid var(--about-line);
  transition: transform 0.18s ease, border-color 0.18s ease;
}

.page-about .brand-node:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .brand-node::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 5px;
  width: 12px;
  height: 12px;
  background: var(--sk-void);
  border: 2px solid var(--sk-cyan);
}

.page-about .brand-node:hover,
.page-about .brand-node:focus-within {
  transform: translateX(4px);
  border-left-color: var(--sk-cyan);
}

.page-about .brand-timeline__ver {
  display: inline-block;
  font-family: var(--sk-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--sk-cyan);
}

.page-about .brand-timeline__t {
  margin: 6px 0 0;
  font-family: var(--sk-display);
  font-weight: 800;
  font-size: clamp(16px, 2vw, 20px);
  line-height: 1.3;
}

.page-about .brand-node__note {
  margin: 8px 0 0;
  max-width: 58ch;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--sk-mist);
  opacity: 0.78;
  transition: opacity 0.18s ease, color 0.18s ease;
}

.page-about .brand-node:hover .brand-node__note,
.page-about .brand-node:focus-within .brand-node__note {
  opacity: 1;
  color: var(--sk-ice);
}

/* ---------- 团队数据 ---------- */
.page-about .brand-teamstats {
  display: grid;
  gap: 10px;
  margin-top: 24px;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

.page-about .brand-teamstats__cell {
  display: grid;
  gap: 8px;
  padding: 16px;
  background: var(--sk-deck);
  border: 1px solid var(--about-line);
  box-shadow: 5px 5px 0 rgba(139, 92, 255, 0.12);
}

.page-about .brand-teamstats__v {
  font-family: var(--sk-mono);
  font-size: clamp(30px, 4vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--sk-purple);
}

.page-about .brand-teamstats__l {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--sk-mist);
}

/* ---------- 合作 ---------- */
.page-about .brand-coop {
  display: grid;
  gap: 10px;
  margin-top: 22px;
}

.page-about .brand-coop__item {
  border: 1px solid var(--about-line);
  background: var(--sk-cabin);
  transition: border-color 0.16s ease;
}

.page-about .brand-coop__item[open] {
  border-color: var(--sk-cyan);
}

.page-about .brand-coop__item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  cursor: pointer;
  list-style: none;
  font-family: var(--sk-display);
  font-weight: 800;
  font-size: 15px;
  color: var(--sk-ice);
}

.page-about .brand-coop__item summary::-webkit-details-marker {
  display: none;
}

.page-about .brand-coop__item summary:hover {
  color: var(--sk-cyan);
}

.page-about .brand-coop__sign {
  font-family: var(--sk-mono);
  font-size: 16px;
  color: var(--sk-cyan);
  transition: transform 0.16s ease;
}

.page-about .brand-coop__item[open] .brand-coop__sign {
  transform: rotate(45deg);
}

.page-about .brand-coop__item p {
  margin: 0;
  padding: 0 14px 14px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--sk-mist);
}

.page-about .brand-inline-link {
  margin-top: 20px;
}

.page-about .brand-inline-link a {
  color: var(--sk-cyan);
  font-family: var(--sk-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  text-decoration: none;
  border-bottom: 1px solid rgba(56, 242, 208, 0.4);
  padding-bottom: 2px;
}

.page-about .brand-inline-link a:hover,
.page-about .brand-inline-link a:focus-visible {
  border-bottom-color: var(--sk-cyan);
}

/* ---------- 反馈状态 ---------- */
.page-about .brand-status {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 0;
  padding: 0;
}

.page-about .brand-status__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border: 1px solid var(--about-line);
  font-family: var(--sk-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--sk-mist);
}

.page-about .brand-status__item::before {
  content: "";
  width: 7px;
  height: 7px;
  background: var(--sk-mist);
}

.page-about .brand-status__item--doing {
  color: var(--sk-ice);
  border-color: var(--sk-purple);
}

.page-about .brand-status__item--doing::before {
  background: var(--sk-purple);
}

.page-about .brand-status__item--done {
  color: var(--sk-ice);
  border-color: var(--sk-pulse);
}

.page-about .brand-status__item--done::before {
  background: var(--sk-pulse);
}

/* ---------- 下一步入口 ---------- */
.page-about .brand-next {
  display: grid;
  gap: 10px;
  margin-top: 26px;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
}

.page-about .brand-next__link {
  display: grid;
  gap: 6px;
  padding: 16px;
  background: var(--sk-cabin);
  border: 1px solid var(--about-line);
  text-decoration: none;
  transition: transform 0.16s ease, border-color 0.16s ease, background-color 0.16s ease;
}

.page-about .brand-next__link:hover,
.page-about .brand-next__link:focus-visible {
  transform: translateY(-2px);
  border-color: var(--sk-orange);
  background: var(--sk-deck);
}

.page-about .brand-next__k {
  font-family: var(--sk-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--sk-orange);
}

.page-about .brand-next__t {
  font-family: var(--sk-display);
  font-weight: 800;
  font-size: 15px;
  line-height: 1.4;
  color: var(--sk-ice);
}

/* ---------- 桌面端 ---------- */
@media (min-width: 960px) {
  .page-about .brand-body {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }

  .page-about .brand-index {
    position: sticky;
    top: 24px;
    padding: 20px 16px;
    gap: 16px;
  }

  .page-about .brand-index__list {
    flex-direction: column;
    overflow: visible;
    gap: 2px;
  }

  .page-about .brand-index__list a {
    border: 0;
    border-left: 2px solid var(--about-line);
    padding: 9px 0 9px 12px;
    font-size: 14px;
    background: transparent;
    width: 100%;
  }

  .page-about .brand-index__list a:hover,
  .page-about .brand-index__list a:focus-visible {
    border-left-color: var(--sk-cyan);
    color: var(--sk-ice);
    background: transparent;
  }

  .page-about .brand-index__cta {
    display: block;
  }

  .page-about .brand-path__arrow {
    align-self: center;
  }
}

@media (min-width: 1200px) {
  .page-about .brand-hero {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .brand-chapter .sk-h2 {
    max-width: 24ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .brand-node,
  .page-about .brand-league,
  .page-about .brand-next__link,
  .page-about .brand-coop__sign,
  .page-about .brand-node__note {
    transition: none;
  }

  .page-about .brand-node:hover,
  .page-about .brand-node:focus-within,
  .page-about .brand-league:hover,
  .page-about .brand-next__link:hover,
  .page-about .brand-next__link:focus-visible {
    transform: none;
  }
}