.page-about {
  --pa-line: rgba(44, 74, 102, 0.5);
  --pa-gridline: rgba(44, 74, 102, 0.22);
  --pa-gap: clamp(28px, 4vw, 56px);
  background: var(--sd-deep);
  color: var(--sd-white);
  font-family: var(--sd-font-body);
  line-height: 1.75;
  overflow-x: hidden;
}

.page-about * {
  box-sizing: border-box;
}

.page-about .sd-media__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about [data-index-target] {
  scroll-margin-top: 110px;
}

/* ---------- 首屏 ---------- */

.page-about .pa-hero {
  position: relative;
  padding: clamp(20px, 3vw, 36px) 0 0;
  background:
    repeating-linear-gradient(90deg, var(--pa-gridline) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(0deg, var(--pa-gridline) 0 1px, transparent 1px 72px),
    var(--sd-deep);
  border-bottom: 1px solid var(--pa-line);
}

.page-about .pa-crumbs {
  margin-bottom: clamp(24px, 3vw, 44px);
}

.page-about .pa-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .pa-hero__title {
  margin: 12px 0 18px;
  max-width: 15ch;
  line-height: 1.04;
}

.page-about .pa-hero__lede {
  max-width: 62ch;
  color: var(--sd-mist);
}

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

.page-about .pa-stat {
  background: var(--sd-panel);
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .pa-stat__num {
  font-family: var(--sd-font-data);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.1;
  color: var(--sd-orange);
  letter-spacing: -0.01em;
}

.page-about .pa-stat__label {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--sd-mist);
}

.page-about .pa-hero__figure {
  margin: clamp(32px, 5vw, 64px) 0 0;
  border-top: 1px solid var(--pa-line);
}

/* ---------- 主体骨架 ---------- */

.page-about .pa-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  padding-top: clamp(8px, 2vw, 16px);
}

.page-about .pa-index {
  display: none;
}

.page-about .pa-flow {
  min-width: 0;
}

/* ---------- 章节 ---------- */

.page-about .pa-sec {
  position: relative;
  padding: clamp(44px, 6vw, 88px) 0;
  border-top: 1px solid var(--pa-line);
}

.page-about .pa-sec:first-child {
  border-top: 0;
}

.page-about .pa-sec__head {
  margin-bottom: clamp(22px, 3vw, 36px);
}

.page-about .pa-sec__title {
  margin: 10px 0 16px;
  font-size: clamp(26px, 3.4vw, 42px);
  line-height: 1.2;
}

.page-about .pa-sec__lede {
  max-width: 68ch;
  color: var(--sd-mist);
  margin: 0 0 clamp(24px, 3vw, 36px);
}

.page-about .pa-sec__more {
  margin: clamp(22px, 3vw, 32px) 0 0;
  color: var(--sd-mist);
  font-size: 15px;
}

.page-about .pa-link {
  color: var(--sd-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(33, 212, 224, 0.4);
  transition: color 180ms var(--sd-ease), border-color 180ms var(--sd-ease);
}

.page-about .pa-link:hover,
.page-about .pa-link:focus-visible {
  color: var(--sd-white);
  border-bottom-color: var(--sd-orange);
}

/* ---------- 事实表 ---------- */

.page-about .pa-facts {
  margin: 0;
  display: grid;
  gap: 1px;
  background: var(--pa-line);
  border: 1px solid var(--pa-line);
}

.page-about .pa-facts__row {
  background: var(--sd-panel);
  display: grid;
  gap: 8px;
  padding: 18px 20px;
}

.page-about .pa-facts__k {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--sd-cyan);
  text-transform: none;
}

.page-about .pa-facts__v {
  margin: 0;
  font-size: 15px;
  color: var(--sd-white);
}

/* ---------- 五条内容线 ---------- */

.page-about .pa-lines {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .pa-tabs {
  min-width: 0;
}

.page-about .sd-tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
  border-bottom: 1px solid var(--pa-line);
}

.page-about .sd-tabs__tab {
  appearance: none;
  background: transparent;
  border: 0;
  border-bottom: 2px solid transparent;
  color: var(--sd-mist);
  font-family: var(--sd-font-body);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.04em;
  padding: 10px 14px;
  margin-bottom: -1px;
  cursor: pointer;
  transition: color 180ms var(--sd-ease), border-color 180ms var(--sd-ease);
}

.page-about .sd-tabs__tab:hover {
  color: var(--sd-cyan);
}

.page-about .sd-tabs__tab[aria-selected="true"] {
  color: var(--sd-white);
  border-bottom-color: var(--sd-orange);
}

.page-about .sd-tabs__tab:focus-visible {
  outline: 1px solid var(--sd-cyan);
  outline-offset: -2px;
}

.page-about .pa-linepanel {
  padding-top: clamp(20px, 3vw, 32px);
}

.page-about .pa-linepanel[hidden] {
  display: none;
}

.page-about .pa-linepanel .sd-h3 {
  margin: 0 0 16px;
  font-size: clamp(19px, 2.1vw, 24px);
  line-height: 1.35;
}

.page-about .pa-meta {
  margin: 0 0 20px;
  display: grid;
  gap: 4px;
}

.page-about .pa-meta dt {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--sd-orange);
  margin-top: 14px;
}

.page-about .pa-meta dt:first-of-type {
  margin-top: 0;
}

.page-about .pa-meta dd {
  margin: 0;
  font-size: 15px;
  color: var(--sd-mist);
  max-width: 66ch;
}

.page-about .pa-lines__figure {
  margin: 0;
  border-top: 1px solid var(--pa-line);
}

/* ---------- 更新节奏 ---------- */

.page-about .pa-rhythm {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--pa-line);
}

.page-about .pa-rhythm__item {
  background: var(--sd-deep);
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 20px 20px 22px;
  border-left: 2px solid transparent;
  transition: background 200ms var(--sd-ease), border-color 200ms var(--sd-ease);
}

.page-about .pa-rhythm__item:hover,
.page-about .pa-rhythm__item:focus-within,
.page-about .pa-rhythm__item:focus {
  background: var(--sd-panel);
  border-left-color: var(--sd-orange);
  outline: none;
}

.page-about .pa-rhythm__time {
  font-family: var(--sd-font-data);
  font-variant-numeric: tabular-nums;
  font-size: 22px;
  line-height: 1.2;
  color: var(--sd-lime);
}

.page-about .pa-rhythm__name {
  font-size: 15px;
  font-weight: 500;
  color: var(--sd-white);
}

.page-about .pa-rhythm__desc {
  font-size: 14px;
  color: var(--sd-mist);
  max-width: 62ch;
}

/* ---------- 赛季时间线 ---------- */

.page-about .pa-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
}

.page-about .pa-stage {
  position: relative;
  padding: 0 0 30px 28px;
  border-left: 1px solid var(--pa-line);
}

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

.page-about .pa-stage::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 7px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--sd-cyan);
}

.page-about .pa-stage:first-child::before {
  background: var(--sd-orange);
  animation: pa-pulse 2.4s ease-in-out infinite;
}

.page-about .pa-stage__idx {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--sd-mist);
}

.page-about .pa-stage__name {
  margin: 6px 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--sd-white);
}

.page-about .pa-stage__brief {
  margin: 0 0 10px;
  font-size: 13px;
  color: var(--sd-cyan);
}

.page-about .pa-stage__more {
  font-size: 14px;
}

.page-about .pa-stage__more summary {
  list-style: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--sd-mist);
  font-size: 12px;
  letter-spacing: 0.16em;
  border-bottom: 1px solid rgba(168, 191, 212, 0.35);
  padding-bottom: 2px;
}

.page-about .pa-stage__more summary::-webkit-details-marker {
  display: none;
}

.page-about .pa-stage__more summary::after {
  content: "+";
  font-family: var(--sd-font-data);
  color: var(--sd-orange);
}

.page-about .pa-stage__more[open] summary::after {
  content: "–";
}

.page-about .pa-stage__more summary:hover {
  color: var(--sd-white);
}

.page-about .pa-stage__more p {
  margin: 12px 0 0;
  color: var(--sd-mist);
  font-size: 14px;
  line-height: 1.7;
}

@keyframes pa-pulse {
  0%, 100% { box-shadow: 0 0 0 3px rgba(255, 107, 26, 0.18); }
  50% { box-shadow: 0 0 0 9px rgba(255, 107, 26, 0.04); }
}

/* ---------- 团队与协作 ---------- */

.page-about .pa-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .pa-team__figure {
  margin: 0;
  border-top: 1px solid var(--pa-line);
}

.page-about .pa-team__body {
  min-width: 0;
}

.page-about .pa-team__body > p {
  margin: 0 0 22px;
  color: var(--sd-mist);
  max-width: 66ch;
}

.page-about .pa-crews {
  list-style: none;
  margin: 0 0 32px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--pa-line);
}

.page-about .pa-crew {
  background: var(--sd-deep);
  padding: 18px 16px 20px;
}

.page-about .pa-crew__name {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 700;
  color: var(--sd-white);
}

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

.page-about .pa-team__sub {
  margin: 0 0 16px;
  font-size: 17px;
  font-weight: 700;
}

.page-about .pa-partners {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .pa-partners__item {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  padding: 16px 0;
  border-top: 1px solid var(--pa-line);
}

.page-about .pa-partners__num {
  font-family: var(--sd-font-data);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  line-height: 1;
  color: var(--sd-orange);
}

.page-about .pa-partners__txt {
  font-size: 14px;
  color: var(--sd-mist);
}

/* ---------- 内容来源 ---------- */

.page-about .pa-sources {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .pa-sources__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 16px;
  padding: 22px 0;
  border-top: 1px solid var(--pa-line);
}

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

.page-about .pa-sources__no {
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--sd-cyan);
  padding-top: 4px;
}

.page-about .pa-sources__name {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--sd-white);
}

.page-about .pa-sources__item p {
  margin: 0;
  font-size: 14px;
  color: var(--sd-mist);
  max-width: 66ch;
}

/* ---------- 收尾 ---------- */

.page-about .pa-cta {
  margin: clamp(32px, 5vw, 64px) 0 clamp(48px, 6vw, 88px);
  padding: clamp(28px, 4vw, 48px);
  background:
    repeating-linear-gradient(90deg, var(--pa-gridline) 0 1px, transparent 1px 72px),
    var(--sd-panel);
  border-left: 3px solid var(--sd-orange);
}

.page-about .pa-cta__title {
  margin: 0 0 14px;
  font-size: clamp(22px, 2.6vw, 32px);
  line-height: 1.25;
}

.page-about .pa-cta__text {
  margin: 0 0 24px;
  max-width: 66ch;
  color: var(--sd-mist);
  font-size: 15px;
}

.page-about .pa-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .pa-facts__row {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }

  .page-about .pa-rhythm__item {
    grid-template-columns: 160px 130px minmax(0, 1fr);
    align-items: baseline;
    gap: 24px;
    padding: 20px 24px;
  }
}

@media (min-width: 900px) {
  .page-about .pa-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(36px, 5vw, 72px);
    align-items: end;
  }

  .page-about .pa-lines {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .pa-team {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    align-items: start;
  }

  .page-about .pa-timeline {
    grid-template-columns: repeat(7, minmax(0, 1fr));
  }

  .page-about .pa-stage {
    padding: 26px 16px 0 0;
    border-left: 0;
    border-top: 1px solid var(--pa-line);
  }

  .page-about .pa-stage:last-child {
    border-top-color: var(--sd-orange);
  }

  .page-about .pa-stage::before {
    left: 0;
    top: -4px;
  }

  .page-about .pa-stage__name {
    font-size: 16px;
  }
}

@media (min-width: 1024px) {
  .page-about .pa-body {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: clamp(36px, 5vw, 80px);
    align-items: start;
  }

  .page-about .pa-index {
    display: block;
    position: sticky;
    top: 110px;
    padding-top: clamp(48px, 6vw, 88px);
  }

  .page-about .pa-index .sd-label {
    margin: 0 0 16px;
    color: var(--sd-mist);
  }

  .page-about .pa-index__nav {
    display: flex;
    flex-direction: column;
    gap: 0;
    border-left: 1px solid var(--pa-line);
  }

  .page-about .pa-index__nav .sd-index__link {
    display: flex;
    align-items: baseline;
    gap: 10px;
    padding: 11px 12px 11px 16px;
    margin-left: -1px;
    border-left: 2px solid transparent;
    color: var(--sd-mist);
    text-decoration: none;
    font-size: 13px;
    line-height: 1.4;
    transition: color 180ms var(--sd-ease), border-color 180ms var(--sd-ease);
  }

  .page-about .pa-index__nav .sd-index__link .sd-mono {
    font-size: 11px;
    color: var(--sd-grid);
    transition: color 180ms var(--sd-ease);
  }

  .page-about .pa-index__nav .sd-index__link:hover,
  .page-about .pa-index__nav .sd-index__link:focus-visible {
    color: var(--sd-white);
    border-left-color: var(--sd-cyan);
  }

  .page-about .pa-index__nav .sd-index__link[aria-current] {
    color: var(--sd-orange);
    border-left-color: var(--sd-orange);
  }

  .page-about .pa-index__nav .sd-index__link[aria-current] .sd-mono {
    color: var(--sd-orange);
  }
}

@media (min-width: 1200px) {
  .page-about .pa-hero__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .pa-stage:first-child::before {
    animation: none;
    box-shadow: 0 0 0 3px rgba(255, 107, 26, 0.18);
  }

  .page-about * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}