.page-about {
  --about-radius: clamp(40px, 8vw, 120px);
  --about-card-gap: clamp(16px, 2.6vw, 28px);
  display: block;
  background: var(--jade);
  color: var(--paper);
  overflow-x: clip;
}

/* ---------- 通用栅格兜底 ---------- */
.page-about .grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 40px);
}
.page-about .span-4 { grid-column: span 4; }
.page-about .span-5 { grid-column: span 5; }
.page-about .span-6 { grid-column: span 6; }
.page-about .span-7 { grid-column: span 7; }
.page-about .span-8 { grid-column: span 8; }
.page-about .span-12 { grid-column: span 12; }

.page-about .section {
  padding-block: clamp(56px, 8vw, 108px);
}

.page-about .prose {
  font-size: 1rem;
  line-height: 1.85;
  letter-spacing: .02em;
  color: var(--paper);
  max-width: 56ch;
}

.page-about .about-head {
  max-width: 62ch;
  margin-bottom: clamp(28px, 4vw, 48px);
}
.page-about .about-head h2,
.page-about h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.6rem, 3vw, 2.6rem);
  line-height: 1.2;
  letter-spacing: -.005em;
  margin: 10px 0 16px;
  color: var(--paper);
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--lava);
  margin: 0 0 4px;
}

.page-about .meta { color: var(--mist); }
.page-about .mono { font-family: var(--font-mono); }

/* ---------- 图片容器 ---------- */
.page-about .img-frame {
  position: relative;
  overflow: hidden;
  max-width: 100%;
  background: var(--deep);
  border: var(--edge);
  box-shadow: var(--hard-ink);
}
.page-about .img-frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .img-frame--arc {
  border-radius: 0 0 0 var(--about-radius);
}
.page-about .img-frame--photo {
  border-radius: 0 var(--about-card-gap) 0 var(--about-card-gap);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: clamp(96px, 16vw, 176px);
  padding-bottom: clamp(40px, 8vw, 88px);
  background:
    radial-gradient(120% 90% at 86% 4%, rgba(47, 243, 208, .18) 0%, rgba(47, 243, 208, 0) 58%),
    radial-gradient(90% 70% at 4% 96%, rgba(255, 106, 43, .16) 0%, rgba(255, 106, 43, 0) 60%),
    linear-gradient(155deg, var(--abyss) 0%, var(--deep) 46%, var(--jade) 100%);
}

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--mist);
  margin-bottom: clamp(24px, 5vw, 48px);
}
.page-about .breadcrumbs a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .25s ease, border-color .25s ease;
}
.page-about .breadcrumbs a:hover { color: var(--cyan); border-bottom-color: var(--cyan); }
.page-about .breadcrumbs [aria-current] { color: var(--mint); }

.page-about .about-hero__grid {
  align-items: center;
  gap: clamp(28px, 5vw, 60px);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.05rem, 5.4vw, 4.1rem);
  line-height: 1.12;
  letter-spacing: -.012em;
  margin: 12px 0 22px;
  color: var(--paper);
}
.page-about .glitch {
  display: inline-block;
  text-shadow: 2px 0 0 rgba(47, 243, 208, .5), -2px 0 0 rgba(255, 106, 43, .38);
}

.page-about .about-hero__lead {
  font-size: clamp(1rem, 1.25vw, 1.08rem);
  line-height: 1.85;
  letter-spacing: .02em;
  color: var(--paper);
  max-width: 46ch;
  margin: 0 0 28px;
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 0 0 30px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--steel);
  border: var(--edge);
}
.page-about .about-stat {
  background: var(--abyss);
  padding: 16px 18px;
}
.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 3vw, 1.9rem);
  line-height: 1.1;
  letter-spacing: .03em;
  color: var(--cyan);
}
.page-about .about-stat__label {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .about-hero__visual { position: relative; }
.page-about .about-hero__cap {
  margin: 14px 0 0;
  font-size: 11px;
  letter-spacing: .14em;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 品牌沿革 ---------- */
.page-about .about-history {
  background: var(--deep);
  border-top: var(--edge);
  border-bottom: var(--edge);
}

.page-about .tl-layout {
  display: grid;
  gap: 20px;
  align-items: stretch;
}
.page-about .tl-rail { display: none; }

.page-about .tl-window {
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 20px;
  scrollbar-width: thin;
  scrollbar-color: var(--cyan) var(--abyss);
}
.page-about .tl-window:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 6px;
}
.page-about .tl-window::-webkit-scrollbar { height: 6px; }
.page-about .tl-window::-webkit-scrollbar-track { background: var(--abyss); }
.page-about .tl-window::-webkit-scrollbar-thumb { background: var(--cyan); }

.page-about .tl-track {
  display: flex;
  gap: var(--about-card-gap);
  list-style: none;
  margin: 0;
  padding: 6px 2px 6px 0;
}
.page-about .tl-card {
  flex: 0 0 clamp(238px, 72vw, 320px);
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(20px, 3vw, 28px);
  background: var(--abyss);
  border: var(--edge);
  box-shadow: var(--hard);
  transition: border-color .35s ease, transform .35s ease;
}
.page-about .tl-card:hover {
  border-color: var(--cyan);
  transform: translateY(-4px);
}
.page-about .tl-year {
  display: block;
  font-size: clamp(2.3rem, 6vw, 3.6rem);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--cyan);
}
.page-about .tl-card:nth-child(even) .tl-year { color: var(--lava); }
.page-about .tl-card__title {
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.4;
  margin: 0;
  color: var(--paper);
}
.page-about .tl-card__desc {
  font-size: 14px;
  line-height: 1.75;
  margin: 0;
  color: var(--mist);
}
.page-about .tl-hint {
  margin: 8px 0 0;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--mint);
}

/* ---------- 赛事分类体系 ---------- */
.page-about .about-taxonomy { background: var(--jade); }
.page-about .about-tax-grid { align-items: start; }

.page-about .cat-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--steel);
  border: var(--edge);
  box-shadow: var(--hard-ink);
}
.page-about .cat-cell {
  background: var(--abyss);
  padding: clamp(18px, 3vw, 26px);
  transition: background .3s ease;
}
.page-about .cat-cell:hover { background: var(--deep); }
.page-about .cat-cell__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 4vw, 2.5rem);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--paper);
  transition: color .3s ease;
}
.page-about .cat-cell:hover .cat-cell__num { color: var(--cyan); }
.page-about .cat-cell__label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}
.page-about .cat-cell__bar {
  display: block;
  height: 6px;
  margin-top: 16px;
  background: var(--steel);
  overflow: hidden;
}
.page-about .cat-cell__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--violet));
  transition: filter .3s ease;
}
.page-about .cat-cell:hover .cat-cell__fill { filter: brightness(1.3); }
.page-about .cat-cell:nth-child(1) .cat-cell__fill { width: 23%; }
.page-about .cat-cell:nth-child(2) .cat-cell__fill { width: 100%; }
.page-about .cat-cell:nth-child(3) .cat-cell__fill { width: 31%; }
.page-about .cat-cell:nth-child(4) .cat-cell__fill { width: 8%; }

.page-about .cat-notes {
  display: grid;
  gap: 1px;
  margin-top: clamp(28px, 4vw, 44px);
  background: var(--steel);
  border: var(--edge);
}
.page-about .cat-note {
  background: var(--deep);
  padding: clamp(20px, 3vw, 28px);
}
.page-about .cat-note h3 {
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 10px;
  color: var(--cyan);
}
.page-about .cat-note p {
  font-size: 14px;
  line-height: 1.8;
  margin: 0;
  color: var(--mist);
}

/* ---------- 团队与分工 ---------- */
.page-about .about-team { background: var(--deep); }

.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: clamp(24px, 4vw, 40px);
}
.page-about .filter-btn {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  padding: 10px 16px;
  background: transparent;
  color: var(--mist);
  border: 2px solid var(--steel);
  cursor: pointer;
  transition: color .25s ease, border-color .25s ease, background .25s ease;
}
.page-about .filter-btn:hover {
  color: var(--paper);
  border-color: var(--cyan);
}
.page-about .filter-btn.is-active,
.page-about .filter-btn[aria-pressed="true"] {
  background: var(--violet);
  border-color: var(--violet);
  color: var(--paper);
}

.page-about .team-grid { align-items: stretch; }
.page-about .team-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(20px, 3vw, 30px);
  background: var(--abyss);
  border: var(--edge);
  box-shadow: var(--hard);
  transition: border-color .35s ease;
}
.page-about .team-card:hover { border-color: var(--cyan); }
.page-about .team-card.is-hidden,
.page-about .team-card[hidden] { display: none; }
.page-about .team-card__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
}
.page-about .team-card__name {
  font-size: 1.05rem;
  font-weight: 700;
  margin: 0;
  color: var(--paper);
}
.page-about .team-card__count {
  font-size: clamp(1.9rem, 4.4vw, 2.8rem);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--cyan);
}
.page-about .team-card__desc {
  font-size: 14px;
  line-height: 1.8;
  margin: 0;
  color: var(--mist);
}

/* ---------- 内容生产与复核 ---------- */
.page-about .about-pipeline {
  background:
    linear-gradient(180deg, var(--abyss) 0%, var(--deep) 100%);
  border-top: var(--edge);
  border-bottom: var(--edge);
}
.page-about .pipe-grid { align-items: start; }

.page-about .flow-list {
  list-style: none;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--steel);
  border: var(--edge);
}
.page-about .flow-step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  align-items: start;
  padding: clamp(16px, 2.4vw, 22px);
  background: var(--abyss);
  transition: background .3s ease;
}
.page-about .flow-step:hover { background: var(--deep); }
.page-about .flow-step__no {
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--lava);
  padding-top: 5px;
}
.page-about .flow-step__title {
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 5px;
  color: var(--paper);
}
.page-about .flow-step__desc {
  font-size: 14px;
  line-height: 1.75;
  margin: 0;
  color: var(--mist);
}

.page-about .pipe-visual {
  position: relative;
  align-self: stretch;
}
.page-about .pipe-visual::before {
  content: "";
  position: absolute;
  top: -18px;
  left: -18px;
  width: 96px;
  height: 96px;
  border-top: 3px solid var(--cyan);
  border-left: 3px solid var(--cyan);
  pointer-events: none;
}

/* ---------- 资质与认证 ---------- */
.page-about .about-credentials { background: var(--jade); }

.page-about .cred-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: var(--edge);
}
.page-about .cred-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: clamp(18px, 2.6vw, 24px) 0;
  border-bottom: 1px solid var(--steel);
}
.page-about .cred-item__key {
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--mint);
}
.page-about .cred-item__val {
  font-size: 15px;
  line-height: 1.8;
  letter-spacing: .02em;
  color: var(--paper);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  background: var(--abyss);
  border-top: var(--edge);
}
.page-about .partners-grid { align-items: center; }
.page-about .partners-link {
  display: inline-block;
  margin-top: 10px;
}
.page-about .partners-visual .img-frame {
  border-radius: var(--about-radius) 0 var(--about-card-gap) 0;
}

/* ---------- 收尾 ---------- */
.page-about .about-close {
  background: var(--jade);
  padding-block: clamp(72px, 16vw, 220px);
}
.page-about .close-inner { max-width: 68ch; }
.page-about .close-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.7rem, 3.6vw, 2.7rem);
  line-height: 1.2;
  margin: 0 0 18px;
  color: var(--paper);
}
.page-about .close-lead {
  font-size: 1rem;
  line-height: 1.9;
  letter-spacing: .02em;
  color: var(--mist);
  margin: 0;
}
.page-about .close-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

/* ---------- 窄屏收敛 ---------- */
@media (max-width: 900px) {
  .page-about .span-4,
  .page-about .span-5,
  .page-about .span-6,
  .page-about .span-7,
  .page-about .span-8 {
    grid-column: 1 / -1;
  }
  .page-about .pipe-visual::before { display: none; }
  .page-about .cat-notes { margin-top: 28px; }
}

/* ---------- 平板与桌面增强 ---------- */
@media (min-width: 660px) {
  .page-about .about-hero__stats { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .page-about .cat-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .page-about .cat-notes { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .cred-item {
    grid-template-columns: minmax(130px, 180px) 1fr;
    gap: 4px 28px;
    align-items: baseline;
  }
}

@media (min-width: 980px) {
  .page-about .tl-layout {
    grid-template-columns: minmax(96px, 12%) 1fr;
    gap: 28px;
  }
  .page-about .tl-rail {
    display: flex;
    align-items: center;
    justify-content: center;
    writing-mode: vertical-rl;
    font-size: 13px;
    letter-spacing: .34em;
    color: var(--mint);
    border-left: 3px solid var(--steel);
    padding-left: 14px;
  }
  .page-about .tl-card { flex-basis: 300px; }
}

@media (min-width: 1180px) {
  .page-about .tl-card { flex-basis: 336px; }
  .page-about .about-hero__lead { max-width: 50ch; }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-card,
  .page-about .cat-cell,
  .page-about .cat-cell__fill,
  .page-about .team-card,
  .page-about .flow-step {
    transition: none;
  }
  .page-about .tl-card:hover { transform: none; }
}