/* ===== 平台概况 · page-about ===== */

.page-about {
  padding-block: clamp(6px, 1.2vw, 18px) clamp(72px, 10vw, 128px);
  color: var(--text-body);
}

.page-about .breadcrumb {
  margin-block: 12px clamp(20px, 3vw, 34px);
}

/* ---------- 首屏：左叙事 + 右影像 ---------- */

.page-about .about-lead {
  position: relative;
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  padding-block-end: clamp(36px, 5vw, 68px);
}

.page-about .about-lead::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--orbit) 18%, var(--cyan) 50%, var(--orbit) 82%, transparent);
  opacity: 0.5;
}

.page-about .about-lead__body { min-width: 0; }

.page-about .about-lead__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6vw, 54px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--star);
  text-shadow: 0 0 24px rgba(43, 227, 209, 0.18);
  margin-block: 12px 18px;
  max-width: 16em;
}

.page-about .about-lead__lede {
  font-size: clamp(15px, 1.55vw, 17px);
  line-height: 1.8;
  color: var(--text-body);
  max-width: 44em;
}

.page-about .about-lead__media {
  margin: 0;
  border-radius: var(--r-card);
  box-shadow: 0 26px 64px rgba(43, 227, 209, 0.08);
}

.page-about .about-lead__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--r-card);
}

@media (min-width: 900px) {
  .page-about .about-lead {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: center;
  }
}

/* ---------- 首屏数据条 ---------- */

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-block-start: clamp(24px, 3vw, 36px);
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  overflow: hidden;
}

@media (min-width: 620px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-stats .stat {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 16px 18px;
  background: var(--stand);
}

.page-about .about-stats .stat__value {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--star);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stats .stat__label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .about-unit {
  font-size: 0.6em;
  margin-inline-start: 2px;
  color: var(--mist);
  letter-spacing: 0;
}

/* ---------- 主栏 + 侧栏 ---------- */

.page-about .about-grid {
  display: grid;
  gap: clamp(34px, 5vw, 60px);
  margin-block-start: clamp(38px, 5.5vw, 72px);
}

.page-about .about-grid__main { min-width: 0; }

@media (min-width: 1000px) {
  .page-about .about-grid {
    grid-template-columns: minmax(0, 1fr) 286px;
    column-gap: clamp(40px, 5vw, 76px);
  }
}

.page-about .about-rail {
  padding: 18px 18px 20px;
  border-radius: var(--r-glass);
}

@media (min-width: 1000px) {
  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 20px);
  }
}

.page-about .about-rail__label { margin-block-end: 12px; }

.page-about .about-rail .timeline__list {
  display: flex;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail .timeline__link {
  display: flex;
  align-items: center;
  gap: 9px;
  min-height: 44px;
  padding: 9px 15px;
  border-radius: var(--r-pill);
  font-size: 14px;
  line-height: 1.4;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-rail .timeline__link .num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  color: var(--orbit);
}

.page-about .about-rail .timeline__link:hover {
  color: var(--star);
  background: rgba(255, 255, 255, 0.06);
}

.page-about .about-rail .timeline__link:hover .num { color: var(--cyan); }

.page-about .about-rail .timeline__link[data-active="true"],
.page-about .about-rail .timeline__link[aria-current="true"] {
  color: var(--star);
  background: rgba(43, 227, 209, 0.1);
  box-shadow: inset 2px 0 0 var(--orange);
}

.page-about .about-rail .timeline__link[data-active="true"] .num,
.page-about .about-rail .timeline__link[aria-current="true"] .num {
  color: var(--orange);
}

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

@media (min-width: 1000px) {
  .page-about .about-rail .timeline__list {
    display: block;
    overflow: visible;
    padding: 0;
  }
  .page-about .about-rail .timeline__link {
    white-space: normal;
    padding-inline: 12px;
  }
  .page-about .about-rail .timeline__item + .timeline__item {
    margin-block-start: 4px;
  }
}

/* ---------- 纵向章节 ---------- */

.page-about .about-block {
  margin-block-end: clamp(52px, 7.5vw, 92px);
}

.page-about .about-block:last-of-type { margin-block-end: 0; }

.page-about .about-block .section-head { margin-block-end: clamp(18px, 2.4vw, 28px); }

.page-about .about-block .prose + .prose { margin-block-start: clamp(16px, 2vw, 22px); }

/* ---------- 数字旁注 ---------- */

.page-about .about-highlight {
  display: grid;
  gap: 8px;
  margin-block: clamp(22px, 3vw, 34px);
}

.page-about .about-highlight__value {
  font-family: var(--font-mono);
  font-size: clamp(38px, 6vw, 56px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .about-highlight__text {
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
  max-width: 42em;
}

/* ---------- 内嵌图 ---------- */

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

.page-about .about-inline-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--r-card);
}

.page-about .about-inline-media .img-frame__caption {
  margin-block-start: 10px;
  font-size: 13px;
  color: var(--mist);
}

/* ---------- 数据点列表 ---------- */

.page-about .about-points {
  list-style: none;
  margin: clamp(24px, 3vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-card);
  overflow: hidden;
}

.page-about .about-points li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 18px;
  padding: 16px clamp(16px, 2vw, 22px);
  background: var(--stand);
}

.page-about .about-points__key {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-points__key .about-unit { color: var(--mist); }

.page-about .about-points__text {
  flex: 1 1 220px;
  min-width: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-body);
}

/* ---------- 场馆覆盖带 ---------- */

.page-about .about-venues {
  padding: clamp(24px, 3.4vw, 40px);
  border: 1px solid var(--line);
  border-radius: var(--r-glass);
  background:
    radial-gradient(120% 140% at 88% 0%, rgba(43, 227, 209, 0.1), transparent 58%),
    linear-gradient(135deg, rgba(42, 27, 77, 0.92), rgba(14, 23, 48, 0.96));
}

.page-about .about-venues__head { margin-block-end: clamp(18px, 2.4vw, 26px); }

.page-about .about-venues__lead {
  margin-block-start: 12px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-body);
  max-width: 46em;
}

.page-about .about-venues__tabs .tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-block-end: clamp(16px, 2vw, 22px);
}

.page-about .about-venues__panel { padding-block-start: 2px; }

.page-about .about-venues__note {
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-body);
  max-width: 48em;
}

.page-about .about-venues__cities {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
}

.page-about .about-venues__cities li {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--cyan);
  background: rgba(43, 227, 209, 0.07);
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  padding: 6px 14px;
}

@media (max-width: 620px) {
  .page-about .about-venues__cities {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 8px;
    scrollbar-width: thin;
  }
  .page-about .about-venues__cities li { flex: 0 0 auto; }
}

/* ---------- 折叠块 ---------- */

.page-about .about-fold {
  margin-block-start: clamp(22px, 3vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  background: var(--stand);
  overflow: hidden;
}

.page-about .about-fold__summary {
  display: flex;
  align-items: center;
  gap: 11px;
  min-height: 44px;
  padding: 16px clamp(16px, 2vw, 22px);
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--star);
}

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

.page-about .about-fold__marker {
  flex: none;
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--cyan);
  border-bottom: 2px solid var(--cyan);
  transform: rotate(45deg);
  transition: transform 0.22s ease;
}

.page-about .about-fold[open] .about-fold__marker { transform: rotate(-135deg); }

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

.page-about .about-fold__body {
  padding: 0 clamp(16px, 2vw, 22px) 20px;
}

.page-about .about-fold__body p {
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-body);
}

.page-about .about-fold__body p + p { margin-block-start: 12px; }

@media (prefers-reduced-motion: reduce) {
  .page-about .about-fold__marker { transition: none; }
}

/* ---------- 结尾行动区 ---------- */

.page-about .about-cta {
  margin-block-start: clamp(56px, 8vw, 96px);
  padding: clamp(26px, 3.6vw, 44px);
  border: 1px solid var(--line);
  border-radius: var(--r-glass);
  background:
    linear-gradient(160deg, rgba(6, 10, 28, 0.9), rgba(42, 27, 77, 0.55)),
    var(--deep);
}

.page-about .about-cta__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 3.2vw, 32px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--star);
  margin-block: 12px 14px;
}

.page-about .about-cta__text {
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-body);
  max-width: 48em;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-block-start: clamp(20px, 2.6vw, 28px);
}
</main>