.page-about {
  --about-rail: 252px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(22px, 4vw, 54px) 0 clamp(34px, 5vw, 72px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 56px);
  align-items: center;
}

.page-about .about-hero__copy .display {
  margin: 12px 0 0;
}

.page-about .about-hero__copy .lede {
  margin-top: clamp(14px, 2vw, 22px);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-hero__visual {
  position: relative;
  border: 1px solid var(--line);
  background: var(--console);
  padding: clamp(10px, 1.6vw, 16px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), calc(100% - 30px) 100%, 0 100%);
}

.page-about .about-hero__svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(26px, 4vw, 48px);
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-hero__stats .stat {
  background: var(--arena);
  padding: clamp(14px, 2vw, 24px);
}

.page-about .about-hero__stats .stat__value {
  font-size: clamp(1.6rem, 3.4vw, 2.4rem);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-hero__stats .stat__label {
  margin-top: 8px;
  font-size: 0.82rem;
  color: var(--silver);
}

/* ---------- 侧边轨道 + 正文 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 56px);
  padding-bottom: clamp(48px, 7vw, 104px);
}

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

.page-about .about-rail__label {
  margin: 0 0 10px;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__list a {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  background: rgba(18, 35, 61, 0.5);
  color: var(--silver);
  font-size: 0.88rem;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.22s ease, border-color 0.22s ease, background-color 0.22s ease;
}

.page-about .about-rail__num {
  color: var(--steel);
  font-size: 0.76rem;
  transition: color 0.22s ease;
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(0, 229, 255, 0.07);
}

.page-about .about-rail__list a:hover .about-rail__num,
.page-about .about-rail__list a:focus-visible .about-rail__num {
  color: var(--cyan);
}

.page-about .about-rail__season {
  margin-top: 18px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  background: var(--console);
}

.page-about .about-rail__season .annotation {
  margin: 0;
}

.page-about .about-season-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0 0 0 18px;
  border-left: 1px solid var(--steel);
}

.page-about .about-season-list li {
  position: relative;
  padding: 0 0 14px;
  font-size: 0.82rem;
  line-height: 1.55;
  color: var(--silver);
}

.page-about .about-season-list li:last-child {
  padding-bottom: 0;
}

.page-about .about-season-list li::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 6px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(0, 229, 255, 0.13);
}

.page-about .about-season-list li:last-child::before {
  background: var(--pulse);
  box-shadow: 0 0 0 3px rgba(0, 255, 194, 0.14);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding: clamp(30px, 4.5vw, 60px) 0;
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-section:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-section__lede {
  margin: 14px 0 0;
  max-width: 68ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .about-media {
  margin: clamp(22px, 3vw, 34px) 0 0;
}

/* ---------- 团队角色标签页 ---------- */
.page-about .about-roles {
  margin-top: clamp(24px, 3vw, 36px);
}

.page-about .about-roles .tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.page-about .about-roles .tab {
  appearance: none;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--silver);
  padding: 9px 16px;
  font: inherit;
  font-size: 0.86rem;
  cursor: pointer;
  transition: color 0.22s ease, border-color 0.22s ease, background-color 0.22s ease;
}

.page-about .about-roles .tab:hover,
.page-about .about-roles .tab:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-roles .tab[aria-selected="true"] {
  color: var(--arena);
  background: var(--cyan);
  border-color: var(--cyan);
  font-weight: 700;
}

.page-about .about-roles .tabpanel {
  position: relative;
  border: 1px solid var(--line);
  background: var(--console);
  padding: clamp(20px, 2.8vw, 32px);
}

.page-about .about-roles .tabpanel::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 34px;
  height: 34px;
  border-top: 2px solid var(--cyan);
  border-left: 2px solid var(--cyan);
}

.page-about .about-role__title {
  margin: 0 0 12px;
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  color: var(--white);
}

.page-about .about-role__count {
  margin-left: 8px;
  font-size: 0.82rem;
  color: var(--orange);
}

.page-about .about-role__text {
  margin: 0 0 18px;
  max-width: 62ch;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .about-role-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 11px;
}

.page-about .about-role-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--silver);
}

.page-about .about-role-list li::before {
  content: "";
  flex: none;
  width: 7px;
  height: 7px;
  margin-top: 0.58em;
  background: var(--orange);
  transform: rotate(45deg);
}

/* ---------- 数据流程 ---------- */
.page-about .about-pipeline {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-pipeline__step {
  position: relative;
  background: var(--console);
  padding: clamp(16px, 2vw, 24px);
}

.page-about .about-pipeline__step::after {
  content: "";
  position: absolute;
  right: 14px;
  bottom: 14px;
  width: 16px;
  height: 1px;
  background: var(--steel);
}

.page-about .about-pipeline__idx {
  display: block;
  margin-bottom: 12px;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-pipeline__step h3 {
  margin: 0 0 8px;
  font-size: 1rem;
  color: var(--white);
}

.page-about .about-pipeline__step p {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--silver);
}

/* ---------- 版本表 ---------- */
.page-about .about-versions {
  margin-top: clamp(22px, 3vw, 34px);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--line);
}

.page-about .about-versions .data-table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.page-about .about-versions .data-table th,
.page-about .about-versions .data-table td {
  padding: 14px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
  line-height: 1.7;
}

.page-about .about-versions .data-table thead th {
  background: var(--console);
  color: var(--silver);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  font-weight: 600;
}

.page-about .about-versions .data-table tbody th {
  font-family: var(--font-data);
  font-size: 0.84rem;
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .about-versions .data-table tbody td {
  color: var(--silver);
}

.page-about .about-versions .data-table tbody tr:last-child th,
.page-about .about-versions .data-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .about-versions .data-table tbody tr:hover th,
.page-about .about-versions .data-table tbody tr:hover td {
  background: rgba(0, 229, 255, 0.05);
}

/* ---------- 赛季时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(24px, 3vw, 36px) 0 0;
  padding: 0 0 0 28px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--steel) 58%, rgba(30, 58, 95, 0));
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 12px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 17px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--arena);
  border: 2px solid var(--cyan);
}

.page-about .about-node {
  border: 1px solid var(--line);
  background: var(--console);
  transition: border-color 0.22s ease;
}

.page-about .about-node[open] {
  border-color: rgba(0, 229, 255, 0.42);
}

.page-about .about-node__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding: 14px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-node__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-data);
  font-size: 1.05rem;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-node[open] .about-node__summary::after {
  content: "\2013";
}

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

.page-about .about-node__season {
  font-family: var(--font-data);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--orange);
}

.page-about .about-node__title {
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--white);
}

.page-about .about-node__text {
  margin: 0;
  padding: 0 18px 18px;
  max-width: 70ch;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--silver);
}

/* ---------- 合作与覆盖 ---------- */
.page-about .about-eco-grid {
  margin-top: clamp(22px, 3vw, 34px);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(215px, 1fr));
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-eco-card {
  background: var(--arena);
  padding: clamp(18px, 2.4vw, 26px);
  border-top: 2px solid transparent;
  transition: border-color 0.24s ease, background-color 0.24s ease;
}

.page-about .about-eco-card:hover {
  border-top-color: var(--orange);
  background: var(--console);
}

.page-about .about-eco-card__num {
  margin: 0;
  font-size: clamp(1.9rem, 3.6vw, 2.6rem);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-eco-card__label {
  margin: 12px 0 0;
  font-size: 0.94rem;
  color: var(--white);
}

.page-about .about-eco-card__text {
  margin: 8px 0 0;
  font-size: 0.84rem;
  line-height: 1.65;
  color: var(--silver);
}

.page-about .about-eco-note {
  margin: clamp(22px, 3vw, 32px) 0 0;
  max-width: 74ch;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .about-eco-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, 0.35);
}

.page-about .about-eco-note a:hover,
.page-about .about-eco-note a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 联系 ---------- */
.page-about .about-contact-grid {
  margin-top: clamp(22px, 3vw, 34px);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-contact-item {
  background: var(--console);
  padding: clamp(16px, 2.2vw, 24px);
}

.page-about .about-contact-item__key {
  margin: 0 0 10px;
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--silver);
  opacity: 0.75;
}

.page-about .about-contact-item__val {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--white);
  word-break: break-word;
}

.page-about .about-contact-item__copy {
  margin-top: 14px;
}

.page-about .about-contact-note {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 72ch;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .about-next {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

  .page-about .about-hero__visual {
    justify-self: end;
    width: 100%;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail__sticky {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .about-rail__list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__list a {
    white-space: normal;
  }
}

@media (max-width: 560px) {
  .page-about .about-hero__visual {
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
  }

  .page-about .about-timeline {
    padding-left: 20px;
  }

  .page-about .about-timeline__item::before {
    left: -21px;
  }

  .page-about .about-node__summary {
    padding: 12px 14px;
  }

  .page-about .about-node__text {
    padding: 0 14px 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node,
  .page-about .about-eco-card,
  .page-about .about-roles .tab,
  .page-about .about-rail__list a {
    transition: none;
  }
}