.page-about {
  --about-line: rgba(22, 69, 110, .62);
  --about-body: #C9D9E3;
  --about-soft: rgba(12, 39, 64, .86);
  display: block;
  overflow-x: clip;
  padding-block: 18px 0;
}

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

.page-about .media-frame img {
  height: 100%;
  object-fit: cover;
}

.page-about .media-frame figcaption {
  font-size: var(--step-12);
  color: var(--text-dim);
  line-height: 1.6;
  padding: 10px 2px 0;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  margin: 0 0 18px;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: var(--step-12);
  color: var(--text-dim);
}

.page-about .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 6px;
  color: var(--ink-700);
}

.page-about .breadcrumb-link {
  color: var(--text-dim);
  text-decoration: none;
  transition: color .2s ease;
}

.page-about .breadcrumb-link:hover {
  color: var(--signal);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  display: grid;
  gap: clamp(24px, 4vw, 38px);
  padding: clamp(26px, 5vw, 52px) clamp(20px, 4vw, 48px) clamp(24px, 4vw, 40px);
  border: 1px solid var(--ink-700);
  border-radius: var(--r-xl);
  background:
    radial-gradient(120% 92% at 88% 4%, rgba(0, 229, 176, .16), rgba(0, 229, 176, 0) 58%),
    linear-gradient(152deg, var(--ink-800) 0%, var(--ink-900) 68%);
}

.page-about .hero-cut {
  position: absolute;
  z-index: 0;
  top: -26%;
  right: -16%;
  width: 78%;
  height: 152%;
  pointer-events: none;
  background: linear-gradient(198deg, rgba(0, 229, 176, .15), rgba(0, 229, 176, 0) 62%);
  clip-path: polygon(58% 0, 100% 0, 100% 100%, 0 100%);
}

.page-about .hero-copy,
.page-about .hero-facts {
  position: relative;
  z-index: 1;
}

.page-about .hero-copy h1 {
  margin: 10px 0 16px;
  font-size: clamp(26px, 6.2vw, 44px);
  line-height: 1.18;
  letter-spacing: -.01em;
  color: var(--text);
  max-width: 20ch;
}

.page-about .lede {
  margin: 0;
  max-width: 62ch;
  font-size: var(--step-16);
  line-height: 1.78;
  color: var(--about-body);
}

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

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

.page-about .fact {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 16px 14px;
  border: 1px solid var(--ink-700);
  border-radius: var(--r-lg);
  background: var(--glass);
  backdrop-filter: blur(6px);
}

.page-about .fact-val {
  font-family: var(--font-mono);
  font-size: var(--step-28);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--signal);
}

.page-about .fact-val em {
  font-style: normal;
  font-size: var(--step-12);
  margin-left: 4px;
  letter-spacing: 0;
}

.page-about .fact--flare .fact-val {
  color: var(--flare);
}

.page-about .fact-key {
  font-size: var(--step-12);
  line-height: 1.55;
  color: var(--text-dim);
}

/* ---------- 章节锚点 ---------- */
.page-about .about-toc {
  display: flex;
  gap: 10px;
  margin: 22px 0 4px;
  padding: 6px 2px 12px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .toc-link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border: 1px solid var(--ink-700);
  border-radius: var(--r-pill);
  background: var(--glass);
  color: var(--text-dim);
  font-size: var(--step-14);
  text-decoration: none;
  transition: color .2s ease, border-color .2s ease, background .2s ease;
}

.page-about .toc-link .num {
  font-family: var(--font-mono);
  font-size: var(--step-12);
  color: var(--signal);
}

.page-about .toc-link:hover,
.page-about .toc-link:focus-visible {
  color: var(--text);
  border-color: var(--signal);
  background: rgba(0, 229, 176, .08);
}

/* ---------- 章节骨架 ---------- */
.page-about .chapter {
  display: grid;
  gap: 16px;
  padding-block: clamp(40px, 7.5vw, 80px);
  border-top: 1px solid var(--about-line);
}

.page-about .chapter-rail {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-about .chapter-num {
  font-family: var(--font-mono);
  font-size: var(--step-44);
  line-height: 1;
  letter-spacing: .04em;
  color: rgba(0, 229, 176, .22);
}

.page-about .vertical-note {
  font-size: var(--step-14);
  letter-spacing: .2em;
  color: var(--text-dim);
}

.page-about .chapter-body h2 {
  margin: 0 0 14px;
  font-size: clamp(23px, 4.4vw, 34px);
  line-height: 1.2;
  color: var(--text);
}

.page-about .chapter-body > p {
  margin: 0 0 18px;
  max-width: 68ch;
  font-size: var(--step-16);
  line-height: 1.8;
  color: var(--about-body);
}

.page-about .chapter-aside {
  margin: 22px 0 0;
  max-width: 66ch;
  padding-left: 16px;
  border-left: 2px solid rgba(0, 229, 176, .5);
  font-size: var(--step-14);
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 分段切换通用 ---------- */
.page-about .tabs {
  display: flex;
  gap: 8px;
}

.page-about .tab {
  font: inherit;
  font-size: var(--step-14);
  color: var(--text-dim);
  background: var(--glass);
  border: 1px solid var(--ink-700);
  border-radius: var(--r-pill);
  padding: 10px 18px;
  cursor: pointer;
  transition: color .2s ease, background .2s ease, border-color .2s ease;
}

.page-about .tab:hover {
  color: var(--text);
  border-color: var(--signal);
}

.page-about .tab[aria-selected="true"] {
  color: #04180F;
  background: var(--signal);
  border-color: var(--signal);
  font-weight: 600;
}

.page-about .tab:focus-visible {
  outline: 2px solid var(--signal-soft);
  outline-offset: 2px;
}

.page-about .tab-panel {
  margin-top: 16px;
  padding: 20px;
  border: 1px solid var(--about-line);
  border-radius: var(--r-lg);
  background: linear-gradient(160deg, rgba(12, 39, 64, .92), rgba(7, 26, 43, .52));
}

.page-about .tab-panel h3 {
  margin: 0 0 8px;
  font-size: var(--step-20);
  line-height: 1.35;
  color: var(--text);
}

.page-about .tab-panel p {
  margin: 0;
  max-width: 64ch;
  font-size: var(--step-16);
  line-height: 1.8;
  color: var(--about-body);
}

/* ---------- 01 入口切换 ---------- */
.page-about .entry-tabs {
  flex-wrap: wrap;
}

.page-about .entry-panel {
  border-left: 3px solid var(--signal);
}

/* ---------- 02 内容生产 ---------- */
.page-about .produce-grid {
  display: grid;
  gap: 24px;
  margin-top: 8px;
}

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

.page-about .prod-step {
  position: relative;
  padding: 18px 18px 18px 20px;
  border: 1px solid var(--about-line);
  border-radius: var(--r-lg);
  background: var(--about-soft);
}

.page-about .prod-step::after {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  bottom: 16px;
  width: 3px;
  border-radius: 3px;
  background: var(--signal);
}

.page-about .prod-step p {
  margin: 8px 0 0;
  font-size: var(--step-14);
  line-height: 1.75;
  color: var(--about-body);
}

.page-about .step-tag {
  display: inline-block;
  padding: 4px 12px;
  border: 1px solid rgba(0, 229, 176, .5);
  border-radius: var(--r-pill);
  font-size: var(--step-12);
  letter-spacing: .06em;
  color: var(--signal);
}

.page-about .step-tag--flare {
  border-color: rgba(255, 122, 26, .55);
  color: var(--flare-soft);
}

.page-about .produce-figure {
  margin: 0;
}

/* ---------- 03 赛季节奏 ---------- */
.page-about .season-tabs {
  position: relative;
  padding-bottom: 12px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .season-tab {
  position: relative;
  flex: 0 0 auto;
  padding-left: 30px;
}

.page-about .season-tab::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 50%;
  width: 8px;
  height: 8px;
  margin-top: -4px;
  border-radius: 50%;
  background: var(--ink-700);
  transition: background .2s ease, box-shadow .2s ease;
}

.page-about .season-tab[aria-selected="true"] {
  color: #200B00;
  background: var(--flare);
  border-color: var(--flare);
  box-shadow: var(--shadow-flare);
}

.page-about .season-tab[aria-selected="true"]::before {
  background: #200B00;
}

.page-about .season-panel {
  border-top: 2px solid rgba(255, 122, 26, .55);
}

.page-about .season-figure {
  margin: 24px 0 0;
}

/* ---------- 04 覆盖与规模 ---------- */
.page-about .scale-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 8px;
}

.page-about .scale-stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 16px;
  border: 1px solid var(--ink-700);
  border-radius: var(--r-lg);
  background: var(--ink-800);
}

.page-about .scale-stat .stat-value {
  font-family: var(--font-mono);
  font-size: var(--step-28);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--signal);
}

.page-about .scale-stat .stat-value em {
  font-style: normal;
  font-size: var(--step-12);
  margin-left: 4px;
  letter-spacing: 0;
}

.page-about .scale-stat .stat-label {
  font-size: var(--step-12);
  line-height: 1.55;
  color: var(--text-dim);
}

.page-about .team-detail {
  margin-top: 20px;
  border: 1px solid var(--ink-700);
  border-radius: var(--r-lg);
  background: var(--glass);
  overflow: hidden;
}

.page-about .team-detail summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 18px;
  list-style: none;
  cursor: pointer;
  font-size: var(--step-16);
  color: var(--text);
}

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

.page-about .summary-icon {
  position: relative;
  flex: 0 0 16px;
  width: 16px;
  height: 16px;
}

.page-about .summary-icon::before,
.page-about .summary-icon::after {
  content: "";
  position: absolute;
  border-radius: 2px;
  background: var(--signal);
  transition: transform .24s ease;
}

.page-about .summary-icon::before {
  left: 0;
  top: 7px;
  width: 16px;
  height: 2px;
}

.page-about .summary-icon::after {
  left: 7px;
  top: 0;
  width: 2px;
  height: 16px;
}

.page-about .team-detail[open] .summary-icon::after {
  transform: scaleY(0);
}

.page-about .team-detail-body {
  padding: 0 18px 18px;
  border-top: 1px solid var(--about-line);
}

.page-about .team-list {
  margin: 0;
  padding: 0;
}

.page-about .team-item {
  padding: 14px 0;
  border-bottom: 1px solid rgba(22, 69, 110, .38);
}

.page-about .team-item:last-child {
  border-bottom: 0;
}

.page-about .team-item dt {
  font-size: var(--step-16);
  color: var(--signal);
  margin-bottom: 6px;
}

.page-about .team-item dd {
  margin: 0;
  font-size: var(--step-14);
  line-height: 1.75;
  color: var(--about-body);
}

.page-about .team-note {
  margin: 14px 0 0;
  font-size: var(--step-12);
  line-height: 1.75;
  color: var(--text-dim);
}

/* ---------- 05 多端 ---------- */
.page-about .device-grid {
  display: grid;
  gap: 22px;
  margin-top: 8px;
}

.page-about .device-shot {
  margin: 0;
  max-width: 300px;
}

.page-about .device-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border: 1px solid var(--about-line);
  border-radius: var(--r-lg);
  background: var(--about-line);
  overflow: hidden;
}

.page-about .device-item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
  padding: 16px 18px;
  background: var(--ink-900);
}

.page-about .device-key {
  flex: 0 0 62px;
  font-family: var(--font-mono);
  font-size: var(--step-14);
  letter-spacing: .08em;
  color: var(--signal);
}

.page-about .device-val {
  flex: 1 1 200px;
  font-size: var(--step-14);
  line-height: 1.7;
  color: var(--about-body);
}

/* ---------- 收尾 ---------- */
.page-about .about-close {
  margin-top: clamp(40px, 7vw, 76px);
  padding: clamp(30px, 5vw, 56px) clamp(20px, 4vw, 48px);
  border: 1px solid var(--ink-700);
  border-radius: var(--r-xl);
  background:
    radial-gradient(110% 80% at 8% 0%, rgba(0, 229, 176, .12), rgba(0, 229, 176, 0) 60%),
    linear-gradient(160deg, var(--ink-800), var(--ink-900));
}

.page-about .about-close h2 {
  margin: 10px 0 14px;
  font-size: clamp(22px, 4vw, 32px);
  line-height: 1.25;
  color: var(--text);
}

.page-about .about-close p {
  margin: 0;
  max-width: 64ch;
  font-size: var(--step-16);
  line-height: 1.8;
  color: var(--about-body);
}

.page-about .close-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .scale-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .85fr);
    align-items: end;
  }

  .page-about .hero-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .chapter {
    grid-template-columns: 112px minmax(0, 1fr);
    gap: 42px;
  }

  .page-about .chapter-rail {
    flex-direction: column;
    align-items: center;
    gap: 20px;
    padding-top: 8px;
  }

  .page-about .vertical-note {
    writing-mode: vertical-rl;
    text-orientation: upright;
    letter-spacing: .38em;
    font-size: var(--step-12);
  }

  .page-about .produce-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, .82fr);
    align-items: start;
    gap: 34px;
  }

  .page-about .device-grid {
    grid-template-columns: 300px minmax(0, 1fr);
    align-items: center;
    gap: 34px;
  }

  .page-about .season-tabs {
    overflow: visible;
  }
}

@media (min-width: 1100px) {
  .page-about .scale-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .scale-stat {
    padding: 22px 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tab,
  .page-about .toc-link,
  .page-about .summary-icon::after,
  .page-about .breadcrumb-link {
    transition: none;
  }
}