.page-about {
  --about-hair: rgba(30, 42, 92, .85);
  --about-num: clamp(38px, 7vw, 72px);
  padding-bottom: clamp(48px, 7vw, 104px);
}

.page-about .breadcrumb {
  margin: 18px 0 24px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 2.4vw, 34px);
  align-items: stretch;
}

.page-about .about-hero__text {
  position: relative;
  padding-left: clamp(14px, 2vw, 26px);
  border-left: 3px solid transparent;
  border-image: var(--grad-flux) 1;
}

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.05;
  font-size: clamp(32px, 6.4vw, 68px);
  margin: 12px 0 18px;
  color: var(--ice);
}

.page-about .about-hero__lede {
  max-width: 40ch;
  color: var(--ice);
}

.page-about .about-hero__note {
  max-width: 42ch;
  margin-top: 14px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(24px, 3vw, 38px) 0 0;
  background: var(--edge);
  border: 2px solid var(--edge);
  box-shadow: var(--hard);
}

.page-about .about-stat {
  padding: 14px 16px 16px;
  background: var(--panel);
}

.page-about .about-stat dt {
  margin-bottom: 8px;
}

.page-about .about-stat dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -.02em;
}

.page-about .about-hero .unit {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--mist);
}

.page-about .about-hero__media {
  margin: 0;
  min-height: 220px;
}

.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  min-height: 220px;
  object-fit: cover;
}

/* ---------- 主体分栏 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 44px);
  margin-top: clamp(36px, 5vw, 72px);
}

.page-about .about-toc {
  border-top: 2px solid var(--edge);
  padding-top: 10px;
}

.page-about .about-toc__list {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 0 2px 8px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc__link {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  padding: 8px 12px;
  border: 2px solid var(--edge);
  background: var(--panel);
  color: var(--mist);
  text-decoration: none;
  transition: border-color .18s ease, color .18s ease, transform .18s ease;
}

.page-about .about-toc__link:hover {
  border-color: var(--cyan);
  color: var(--ice);
  transform: translateY(-2px);
}

.page-about .about-toc__link.is-active {
  border-color: var(--cyan);
  color: var(--ice);
  background: linear-gradient(120deg, rgba(0, 240, 224, .16), rgba(122, 92, 255, .12));
}

.page-about .about-toc__num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .about-toc__name {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .06em;
  white-space: nowrap;
}

/* ---------- 章节 ---------- */
.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: clamp(34px, 5vw, 78px);
  min-width: 0;
}

.page-about .about-sec {
  position: relative;
  padding-top: clamp(22px, 3vw, 36px);
  border-top: 2px solid var(--edge);
  scroll-margin-top: calc(var(--bar-h) + 28px);
}

.page-about .about-sec__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--about-num);
  line-height: .9;
  margin: 0 0 6px;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--edge);
  letter-spacing: -.03em;
}

.page-about .about-sec h2 {
  font-family: var(--font-head);
  font-weight: 900;
  letter-spacing: -.015em;
  font-size: clamp(23px, 3.4vw, 40px);
  line-height: 1.16;
  margin: 0 0 14px;
  color: var(--ice);
}

.page-about .about-sec__lede {
  max-width: 46ch;
  margin: 0 0 22px;
  color: var(--mist);
  font-size: 16px;
  line-height: 1.75;
}

.page-about .about-prose p {
  max-width: 40ch;
  margin: 0 0 16px;
  color: var(--ice);
  line-height: 1.85;
}

.page-about .about-prose p:last-child {
  margin-bottom: 0;
}

/* ---------- 三支小组 ---------- */
.page-about .about-crew {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 1.8vw, 22px);
}

.page-about .about-crew__card {
  padding: clamp(18px, 2.2vw, 26px);
  background: var(--grad-panel);
  border: 2px solid var(--edge);
  box-shadow: var(--hard);
  transition: border-color .18s ease, transform .18s ease;
}

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

.page-about .about-crew__card h3 {
  margin: 8px 0 10px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 20px;
  color: var(--ice);
  letter-spacing: -.01em;
}

.page-about .about-crew__card > p {
  margin: 0 0 14px;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .about-crew__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-top: 1px solid var(--about-hair);
  padding-top: 14px;
}

.page-about .about-crew__list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  color: var(--ice);
  line-height: 1.6;
}

.page-about .about-crew__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 7px;
  height: 7px;
  background: var(--violet);
}

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

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

.page-about .about-crew__foot {
  margin: 18px 0 0;
  padding-left: 16px;
  border-left: 3px solid var(--orange);
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ice);
}

/* ---------- 四步流程 ---------- */
.page-about .about-steps {
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .about-steps::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--violet) 60%, var(--edge));
}

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

.page-about .about-step details {
  border: 2px solid var(--edge);
  background: var(--grad-panel);
  box-shadow: var(--hard);
  transition: border-color .18s ease;
}

.page-about .about-step details[open] {
  border-color: var(--cyan);
}

.page-about .about-step summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px clamp(16px, 2vw, 22px);
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-step__dot {
  position: absolute;
  left: -26px;
  top: 22px;
  width: 16px;
  height: 16px;
  background: var(--ink);
  border: 3px solid var(--cyan);
  transform: rotate(45deg);
}

.page-about .about-step__index {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--orange);
}

.page-about .about-step__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 17px;
  color: var(--ice);
}

.page-about .about-step__body {
  padding: 0 clamp(16px, 2vw, 22px) 18px;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-step__body p {
  margin: 14px 0 0;
  max-width: 44ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 赛季足迹 ---------- */
.page-about .about-track {
  overflow-x: auto;
  padding: 10px 4px 26px;
  border: 2px solid var(--edge);
  background:
    repeating-linear-gradient(90deg, rgba(30, 42, 92, .55) 0 1px, transparent 1px 96px),
    var(--panel);
  scrollbar-width: thin;
}

.page-about .about-track__list {
  display: flex;
  gap: clamp(14px, 2vw, 26px);
  margin: 0;
  padding: 6px clamp(14px, 2vw, 22px) 0;
  list-style: none;
  min-width: max-content;
}

.page-about .about-track__item {
  flex: 0 0 240px;
  padding: 18px 16px 20px;
  border-top: 3px solid var(--cyan);
  background: rgba(5, 11, 31, .82);
  transform: translateY(8px);
}

.page-about .about-track__item:nth-child(2) { transform: translateY(0); border-top-color: var(--violet); }
.page-about .about-track__item:nth-child(3) { transform: translateY(8px); border-top-color: var(--cyan); }
.page-about .about-track__item:nth-child(4) { transform: translateY(0); border-top-color: var(--orange); }
.page-about .about-track__item:nth-child(5) { transform: translateY(8px); border-top-color: var(--violet); }

.page-about .about-track__year {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 26px;
  letter-spacing: -.02em;
  color: var(--ice);
  margin-bottom: 10px;
}

.page-about .about-track__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-track__media {
  margin: 20px 0 0;
}

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

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 1.8vw, 22px);
}

.page-about .about-partner {
  padding: clamp(18px, 2.2vw, 26px);
  background: var(--grad-panel);
  border: 2px solid var(--edge);
  box-shadow: var(--hard);
  transition: border-color .2s ease, transform .2s ease;
}

.page-about .about-partner:hover,
.page-about .about-partner:focus-visible {
  border-color: var(--orange);
  transform: translateY(-2px);
}

.page-about .about-partner h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 19px;
  color: var(--ice);
}

.page-about .about-partner > p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-partner__hover {
  margin-top: 14px !important;
  padding-top: 12px;
  border-top: 1px dashed var(--about-hair);
  color: var(--cyan) !important;
  font-size: 13.5px !important;
  opacity: .72;
  transition: opacity .2s ease;
}

.page-about .about-partner:hover .about-partner__hover,
.page-about .about-partner:focus-visible .about-partner__hover {
  opacity: 1;
}

.page-about .about-partners__note {
  margin: 20px 0 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-partners__note a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 联络 ---------- */
.page-about .about-contact {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 2.4vw, 30px);
}

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

.page-about .about-contact__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 16px clamp(16px, 2vw, 22px);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-contact__row:last-child {
  border-bottom: none;
}

.page-about .about-contact__row dt {
  color: var(--mist);
}

.page-about .about-contact__row dd {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ice);
  word-break: break-word;
}

.page-about .about-contact__value {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--cyan);
}

.page-about .about-contact__aside {
  padding: clamp(18px, 2.2vw, 26px);
  background: var(--grad-panel);
  border: 2px solid var(--edge);
  box-shadow: var(--hard);
}

.page-about .about-contact__aside h3 {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 20px;
  color: var(--ice);
}

.page-about .about-contact__aside p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-crew,
  .page-about .about-partners {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-contact__row {
    grid-template-columns: 160px minmax(0, 1fr);
    align-items: baseline;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-about .about-hero__media {
    min-height: 360px;
  }

  .page-about .about-hero__media img {
    min-height: 360px;
  }

  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-crew {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-contact {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

@media (min-width: 1040px) {
  .page-about .about-body {
    grid-template-columns: 156px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--bar-h) + 20px);
    border-top: none;
    border-left: 2px solid var(--edge);
    padding: 4px 0 4px 12px;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
    gap: 8px;
  }

  .page-about .about-toc__link {
    border: none;
    border-left: 3px solid transparent;
    background: transparent;
    padding: 6px 8px;
    justify-content: flex-start;
  }

  .page-about .about-toc__link:hover {
    transform: none;
    border-left-color: var(--mist);
    background: transparent;
  }

  .page-about .about-toc__link.is-active {
    border-left-color: var(--cyan);
    background: linear-gradient(90deg, rgba(0, 240, 224, .14), transparent);
  }

  .page-about .about-toc__name {
    font-size: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-crew__card,
  .page-about .about-partner,
  .page-about .about-toc__link {
    transition: none;
  }

  .page-about .about-crew__card:hover,
  .page-about .about-partner:hover,
  .page-about .about-toc__link:hover {
    transform: none;
  }
}