.page-about {
  --about-line: rgba(34, 211, 238, 0.34);
  --about-line-violet: rgba(168, 85, 247, 0.34);
  --about-space: clamp(52px, 7vw, 100px);
}

.page-about .section {
  padding-block: var(--about-space);
}

.page-about section[id] {
  scroll-margin-top: calc(var(--header-h) + 76px);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: clamp(22px, 3.2vw, 38px);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .breadcrumbs .crumb {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.22s var(--ease);
}

.page-about .breadcrumbs .crumb:hover {
  color: var(--cyan);
}

.page-about .breadcrumbs .crumb--current {
  color: var(--text);
}

.page-about .breadcrumbs .crumb-dot {
  color: var(--edge);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: clamp(16px, 2.6vw, 34px);
  padding-bottom: clamp(40px, 5.5vw, 76px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: clamp(320px, 46vw, 520px);
  background:
    radial-gradient(52% 100% at 12% 0%, rgba(34, 211, 238, 0.2), transparent 68%),
    radial-gradient(46% 92% at 90% 4%, rgba(168, 85, 247, 0.18), transparent 70%);
  pointer-events: none;
  z-index: 0;
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    align-items: end;
  }
}

.page-about .about-hero__copy {
  max-width: 46ch;
}

.page-about .about-hero .eyebrow {
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-size: clamp(34px, 6vw, 66px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-hero .lede {
  margin: 22px 0 0;
  max-width: 44ch;
  color: var(--text);
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.8;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 34px);
}

.page-about .about-hero__media {
  margin: 0;
  border: 2px solid var(--edge);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

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

.page-about .about-hero__media .media-frame__label {
  padding: 10px 14px;
  border-top: 2px solid var(--edge);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

/* ---------- 章节目录条 ---------- */
.page-about .about-tocbar {
  position: sticky;
  top: var(--header-h);
  z-index: 20;
  padding-block: 10px;
  border-top: 2px solid var(--edge);
  border-bottom: 2px solid var(--edge);
  background: rgba(5, 7, 15, 0.94);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.page-about .about-tocbar__inner {
  display: flex;
  align-items: center;
  gap: 14px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-tocbar__inner::-webkit-scrollbar {
  display: none;
}

.page-about .about-tocbar .toc-title {
  flex: none;
  margin: 0;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  white-space: nowrap;
}

.page-about .about-tocbar .toc-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tocbar .toc-link {
  display: inline-block;
  padding: 6px 12px;
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  color: var(--muted);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.22s var(--ease), border-color 0.22s var(--ease), background 0.22s var(--ease);
}

.page-about .about-tocbar .toc-link:hover,
.page-about .about-tocbar .toc-link:focus-visible {
  color: var(--white);
  border-color: var(--cyan);
  background: rgba(34, 211, 238, 0.08);
}

.page-about .about-tocbar .toc-link.is-active,
.page-about .about-tocbar .toc-link[aria-current="true"] {
  color: var(--void);
  border-color: var(--cyan);
  background: var(--cyan);
}

/* ---------- 使命 ---------- */
.page-about .about-mission__inner {
  max-width: 800px;
  margin-inline: auto;
}

.page-about .about-mission .section-title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(27px, 4vw, 42px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-mission__prose {
  margin-top: clamp(20px, 3vw, 32px);
  color: var(--text);
  font-size: 17px;
  line-height: 1.85;
}

.page-about .about-mission__prose p {
  margin: 0;
}

.page-about .about-mission__prose p + p {
  margin-top: 1.2em;
}

/* ---------- 规模数字 ---------- */
.page-about .about-numbers {
  padding-block: clamp(8px, 1.6vw, 20px);
}

.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

@media (min-width: 780px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }
}

.page-about .about-metric {
  display: flex;
  flex-direction: column;
  padding: clamp(16px, 2.2vw, 24px);
  border: 2px solid var(--edge);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow-hard);
}

.page-about .about-metric__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 40px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .about-metric:nth-child(2) .about-metric__num {
  color: var(--violet);
}

.page-about .about-metric:nth-child(3) .about-metric__num {
  color: var(--white);
}

.page-about .about-metric:nth-child(4) .about-metric__num {
  color: var(--amber);
}

.page-about .about-metric__label {
  display: block;
  margin-top: 10px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.65;
}

/* ---------- 时间线 ---------- */
.page-about .about-history__lede {
  margin: 18px 0 0;
  max-width: 62ch;
  color: var(--text);
  font-size: 16.5px;
  line-height: 1.8;
}

.page-about .about-timeline {
  position: relative;
  margin: clamp(32px, 4.6vw, 58px) 0 0;
  padding: 0 0 0 36px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--violet) 48%, rgba(34, 211, 238, 0.06) 100%);
}

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

.page-about .about-timeline__item + .about-timeline__item {
  margin-top: 16px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -35px;
  top: 24px;
  width: 12px;
  height: 12px;
  background: var(--void);
  border: 2px solid var(--cyan);
  transform: rotate(45deg);
  z-index: 1;
}

.page-about .about-timeline__item:nth-child(even)::before {
  border-color: var(--violet);
}

@media (min-width: 900px) {
  .page-about .about-timeline {
    padding-left: 0;
  }

  .page-about .about-timeline::before {
    left: 50%;
    margin-left: -1px;
  }

  .page-about .about-timeline__item {
    width: calc(50% - 48px);
  }

  .page-about .about-timeline__item:nth-child(odd) {
    margin-right: auto;
  }

  .page-about .about-timeline__item:nth-child(even) {
    margin-left: auto;
  }

  .page-about .about-timeline__item::before {
    left: auto;
    right: -54px;
    top: 28px;
  }

  .page-about .about-timeline__item:nth-child(even)::before {
    left: -54px;
    right: auto;
  }
}

.page-about .about-stage {
  border: 2px solid var(--edge);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow-hard);
  transition: border-color 0.25s var(--ease);
}

.page-about .about-stage[open] {
  border-color: var(--about-line);
}

.page-about .about-timeline__item:nth-child(even) .about-stage[open] {
  border-color: var(--about-line-violet);
}

.page-about .about-stage__summary {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-stage__summary::marker {
  content: "";
}

.page-about .about-stage__season {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .about-timeline__item:nth-child(even) .about-stage__season {
  color: var(--violet);
}

.page-about .about-stage__title {
  padding-right: 28px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.1vw, 23px);
  line-height: 1.26;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-stage__summary::after {
  content: "+";
  position: absolute;
  top: 18px;
  right: 20px;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--muted);
  transition: color 0.22s var(--ease);
}

.page-about .about-stage[open] .about-stage__summary::after {
  content: "–";
  color: var(--cyan);
}

.page-about .about-stage__body {
  margin: 0 20px 20px;
  padding-top: 16px;
  border-top: 1px dashed var(--edge);
  color: var(--text);
  font-size: 15.5px;
  line-height: 1.8;
}

.page-about .about-stage__body p {
  margin: 0;
}

/* ---------- 赛区覆盖 ---------- */
.page-about .about-zones__head {
  max-width: 780px;
}

.page-about .about-zones__lede {
  margin: 18px 0 0;
  color: var(--text);
  font-size: 16.5px;
  line-height: 1.82;
}

.page-about .about-zones__media {
  margin: clamp(28px, 4vw, 48px) 0 0;
  border: 2px solid var(--edge);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

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

.page-about .about-zones__media .media-frame__label {
  padding: 10px 14px;
  border-top: 2px solid var(--edge);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.page-about .about-zones__subtitle {
  margin: clamp(34px, 5vw, 54px) 0 0;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.4vw, 26px);
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-cats {
  display: grid;
  gap: 12px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 700px) {
  .page-about .about-cats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1020px) {
  .page-about .about-cats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-cat {
  padding: 16px 18px;
  border: 2px solid var(--edge);
  border-left: 4px solid var(--cyan);
  border-radius: var(--radius);
  background: var(--panel);
}

.page-about .about-cat:nth-child(2) {
  border-left-color: var(--violet);
}

.page-about .about-cat:nth-child(3) {
  border-left-color: var(--amber);
}

.page-about .about-cat:nth-child(4) {
  border-left-color: var(--green);
}

.page-about .about-cat:nth-child(5) {
  border-left-color: var(--muted);
}

.page-about .about-cat__name {
  display: block;
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-cat__desc {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

/* ---------- 团队 ---------- */
.page-about .about-team__head {
  max-width: 800px;
}

.page-about .about-team__lede {
  margin: 18px 0 0;
  color: var(--text);
  font-size: 16.5px;
  line-height: 1.82;
}

.page-about .about-team__panels {
  display: grid;
  gap: 16px;
  margin-top: clamp(30px, 4.4vw, 52px);
}

@media (min-width: 900px) {
  .page-about .about-team__panels {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
    align-items: start;
  }

  .page-about .about-team__panel:nth-child(2) {
    margin-top: 28px;
  }

  .page-about .about-team__panel:nth-child(3) {
    margin-top: 56px;
  }
}

.page-about .about-team__panel {
  position: relative;
  padding: clamp(20px, 2.6vw, 28px);
  border: 2px solid var(--edge);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow-hard);
}

.page-about .about-team__panel::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 4px;
  background: var(--cyan);
}

.page-about .about-team__panel--violet::after {
  background: var(--violet);
}

.page-about .about-team__panel--amber::after {
  background: var(--amber);
}

.page-about .about-team__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-about .about-team__name {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: 22px;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-team__desc {
  margin: 12px 0 0;
  color: var(--text);
  font-size: 15px;
  line-height: 1.78;
}

.page-about .about-team__media {
  margin: clamp(34px, 4.6vw, 60px) 0 0;
  border: 2px solid var(--edge);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

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

.page-about .about-team__media .media-frame__label {
  padding: 10px 14px;
  border-top: 2px solid var(--edge);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

/* ---------- 合作与认可 ---------- */
.page-about .about-partners__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
}

@media (min-width: 900px) {
  .page-about .about-partners__grid {
    grid-template-columns: 5fr 6fr;
    align-items: start;
  }
}

.page-about .about-partners__copy > p:not(.eyebrow) {
  margin: 18px 0 0;
  color: var(--text);
  font-size: 16.5px;
  line-height: 1.82;
}

.page-about .about-partners__list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-partner {
  padding: clamp(18px, 2.4vw, 24px);
  border: 2px solid var(--edge);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow-hard);
}

.page-about .about-partner__head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0;
}

.page-about .about-partner__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.2vw, 34px);
  font-weight: 600;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-partner:nth-child(2) .about-partner__num {
  color: var(--violet);
}

.page-about .about-partner:nth-child(3) .about-partner__num {
  color: var(--amber);
}

.page-about .about-partner__unit {
  color: var(--white);
  font-size: 16px;
  line-height: 1.4;
}

.page-about .about-partner__desc {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

/* ---------- 使用场景 ---------- */
.page-about .about-scenes__grid {
  display: grid;
  gap: 16px;
  margin-top: clamp(28px, 4vw, 46px);
}

@media (min-width: 820px) {
  .page-about .about-scenes__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-scene {
  display: flex;
  flex-direction: column;
  padding: clamp(20px, 2.6vw, 28px);
  border: 2px solid var(--edge);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(22, 33, 61, 0.55), var(--panel));
  box-shadow: var(--shadow-hard);
}

.page-about .about-scene__tag {
  align-self: flex-start;
}

.page-about .about-scene__name {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-size: 20px;
  line-height: 1.26;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-scene__text {
  flex: 1;
  margin: 12px 0 20px;
  color: var(--text);
  font-size: 15px;
  line-height: 1.78;
}

.page-about .about-scene__link {
  align-self: flex-start;
  padding-bottom: 2px;
  border-bottom: 1px solid rgba(34, 211, 238, 0.4);
  color: var(--cyan);
  font-size: 14px;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-scene__link:hover,
.page-about .about-scene__link:focus-visible {
  color: var(--white);
  border-color: var(--white);
}

/* ---------- 结尾行动 ---------- */
.page-about .about-cta {
  padding-bottom: clamp(60px, 8vw, 110px);
}

.page-about .about-cta__panel {
  position: relative;
  padding: clamp(28px, 4.4vw, 56px);
  border: 2px solid var(--edge);
  border-radius: var(--radius);
  background:
    radial-gradient(80% 140% at 6% 0%, rgba(34, 211, 238, 0.16), transparent 62%),
    radial-gradient(70% 130% at 96% 100%, rgba(168, 85, 247, 0.16), transparent 64%),
    var(--panel);
  box-shadow: var(--shadow-hard);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.4vw, 36px);
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-cta__text {
  max-width: 58ch;
  margin: 16px 0 0;
  color: var(--text);
  font-size: 16.5px;
  line-height: 1.8;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

/* ---------- 窄屏保护 ---------- */
@media (max-width: 480px) {
  .page-about .about-metrics {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-tocbar__inner {
    gap: 10px;
  }

  .page-about .about-metric__num {
    font-size: 30px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stage,
  .page-about .about-scene__link,
  .page-about .about-tocbar .toc-link {
    transition: none;
  }
}