/* ===== 德赢体育 · 品牌档案页 ===== */
.page-about {
  --about-gold-line: rgba(232, 197, 122, 0.42);
  --about-pad: clamp(52px, 8vw, 104px);
  padding-bottom: clamp(40px, 7vw, 88px);
  overflow-x: clip;
}

.page-about .breadcrumb {
  margin-top: clamp(18px, 3.5vw, 34px);
  margin-bottom: clamp(4px, 1.5vw, 10px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(20px, 4vw, 40px) 0 clamp(46px, 8vw, 92px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -20%;
  right: -24%;
  width: min(58vw, 620px);
  aspect-ratio: 1 / 1;
  background: radial-gradient(circle at 42% 40%, rgba(56, 242, 195, 0.15), rgba(56, 242, 195, 0) 68%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  left: -12%;
  bottom: -4%;
  width: min(48vw, 500px);
  height: 190px;
  background: linear-gradient(100deg, rgba(122, 107, 255, 0.15), rgba(122, 107, 255, 0));
  transform: rotate(-7deg);
  border-radius: 50% 40% 55% 45% / 60% 50% 50% 40%;
  pointer-events: none;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(34px, 6vw, 64px);
  align-items: start;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 1.1rem + 3.8vw, 3.6rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 16px 0 0;
  max-width: 15em;
}

.page-about .about-hero__lede {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  max-width: 38em;
  font-size: var(--step-0);
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-hero__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3.6vw, 36px);
}

.page-about .about-hero__panel {
  position: relative;
  padding: clamp(22px, 3.4vw, 34px) clamp(20px, 3.4vw, 32px);
  background: linear-gradient(158deg, #0A2438 0%, #10334A 58%, #143A4E 100%);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-hero__panel::after {
  content: "";
  position: absolute;
  right: -28%;
  bottom: -34%;
  width: 78%;
  aspect-ratio: 1 / 1;
  border-radius: 54% 46% 62% 38% / 44% 58% 42% 56%;
  background: var(--mint);
  opacity: 0.07;
  transform: rotate(-8deg);
  pointer-events: none;
}

.page-about .hero-facts {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .hero-facts li {
  display: flex;
  align-items: baseline;
  gap: clamp(12px, 2vw, 18px);
  padding: clamp(12px, 1.9vw, 17px) 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .hero-facts li:first-child { padding-top: 0; }
.page-about .hero-facts li:last-child { border-bottom: 0; padding-bottom: 0; }

.page-about .hero-facts__num {
  flex: 0 0 auto;
  min-width: 2.1em;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.7rem, 1.2rem + 2.1vw, 2.4rem);
  font-weight: 700;
  line-height: 1;
  color: var(--mint);
}

.page-about .hero-facts__label {
  font-size: var(--step--1);
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 章节骨架 ---------- */
.page-about .chapter {
  position: relative;
  padding: var(--about-pad) 0;
}

.page-about .chapter__grid {
  display: grid;
  gap: clamp(14px, 2.6vw, 26px);
}

.page-about .chapter__num {
  display: inline-block;
  padding-top: 4px;
  font-size: var(--step--1);
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--sand);
  opacity: 0.85;
}

.page-about .chapter__body .section-head {
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .big-point {
  margin: clamp(26px, 4.4vw, 42px) 0 0;
  padding-left: clamp(16px, 3vw, 26px);
  border-left: 3px solid var(--coral);
  max-width: 22em;
  font-family: var(--font-display);
  font-size: var(--step-2);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--text);
}

/* ---------- 栏目标签页 ---------- */
.page-about .col-tabs {
  margin-top: clamp(22px, 3.6vw, 36px);
}

.page-about .col-tabs .tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-about .col-tabs .tab {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  padding: 9px 16px;
  cursor: pointer;
  transition: color 180ms ease, border-color 180ms ease, background-color 180ms ease;
}

.page-about .col-tabs .tab:hover {
  color: var(--mint-soft);
  border-color: var(--line);
}

.page-about .col-tabs .tab[aria-selected="true"] {
  color: var(--abyss);
  background: var(--mint);
  border-color: var(--mint);
  font-weight: 700;
}

.page-about .col-tabpanel {
  max-width: 44rem;
  padding-top: clamp(20px, 3vw, 30px);
}

.page-about .col-tabpanel__when {
  display: inline-block;
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.1em;
  color: var(--coral);
}

.page-about .col-tabpanel h3,
.page-about .team-panel h3 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: var(--step-1);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .col-tabpanel p,
.page-about .team-panel p {
  margin: 0;
  font-size: var(--step-0);
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .team-media {
  margin: 0 0 clamp(26px, 4vw, 38px);
}

.page-about .team-media img,
.page-about .data-media img,
.page-about .about-signoff img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
}

.page-about .team-media img {
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .team-tabs {
  margin-top: clamp(4px, 1.4vw, 10px);
}

.page-about .team-tabs .tablist {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 4px;
  max-width: 100%;
  padding: 6px;
  border-radius: 999px;
  background: var(--lane);
}

.page-about .team-tabs .tab {
  font-family: var(--font-body);
  font-size: var(--step--1);
  font-weight: 500;
  color: var(--muted);
  background: transparent;
  border: 0;
  border-radius: 999px;
  padding: 9px 16px;
  cursor: pointer;
  white-space: nowrap;
  transition: color 180ms ease, background-color 180ms ease;
}

.page-about .team-tabs .tab[aria-selected="true"] {
  background: var(--rail-ink);
  color: var(--mint);
  font-weight: 700;
}

.page-about .team-panel {
  padding-top: clamp(20px, 3vw, 28px);
  max-width: 42rem;
}

.page-about .team-panel h3 {
  position: relative;
  padding-left: 18px;
}

.page-about .team-panel h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.45em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--mint);
}

.page-about #panel-check h3::before { background: var(--coral); }
.page-about #panel-eng h3::before { background: var(--sand); }

.page-about .tabpanel[hidden] {
  display: none;
}

.page-about .team-figures {
  margin: clamp(24px, 3.8vw, 38px) 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .team-figures__item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: clamp(12px, 1.9vw, 17px) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .team-figures dt {
  flex: 0 0 auto;
  min-width: 4.4em;
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--step-1);
  font-weight: 700;
  color: var(--sand);
  line-height: 1.2;
}

.page-about .team-figures dd {
  flex: 1 1 16rem;
  margin: 0;
  font-size: var(--step--1);
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 数据来源 ---------- */
.page-about .data-split {
  display: grid;
  gap: clamp(26px, 4.4vw, 46px);
  align-items: start;
}

.page-about .data-split__text .big-point {
  font-size: var(--step-1);
}

.page-about .data-media {
  position: relative;
  margin: 0;
}

.page-about .data-media img {
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* ---------- 版本时间线 ---------- */
.page-about .timeline-scroll {
  position: relative;
  margin-top: clamp(6px, 1.4vw, 12px);
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(22px, 3vw, 30px);
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 0 32px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--sand);
  box-shadow: 0 0 0 4px rgba(232, 197, 122, 0.14);
}

.page-about .timeline__item::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 22px;
  bottom: calc(-1 * clamp(22px, 3vw, 30px));
  width: 1px;
  background: linear-gradient(180deg, var(--about-gold-line), rgba(232, 197, 122, 0.06));
}

.page-about .timeline__item:last-child::after {
  display: none;
}

.page-about .timeline__ver {
  display: inline-block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--step--1);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--sand);
}

.page-about .timeline__item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: var(--step-0);
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
}

.page-about .timeline__item p {
  margin: 0;
  font-size: var(--step--1);
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 更新节奏 ---------- */
.page-about .rhythm-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2.4vw, 22px);
}

.page-about .rhythm-list li {
  display: grid;
  gap: 6px;
  padding-left: clamp(14px, 2.4vw, 20px);
  border-left: 2px solid var(--line);
}

.page-about .rhythm-list__time {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--step-0);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--mint);
}

.page-about .rhythm-list__text {
  font-size: var(--step--1);
  line-height: 1.65;
  color: var(--muted);
}

.page-about .about-cta {
  margin-top: clamp(30px, 5vw, 50px);
  padding: clamp(22px, 3.4vw, 34px) clamp(20px, 3.2vw, 32px);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(10, 36, 56, 0.9), rgba(20, 58, 78, 0.55));
  border-left: 3px solid var(--mint);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 40em;
  font-size: var(--step-0);
  line-height: 1.75;
  color: var(--text);
}

.page-about .about-cta__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(18px, 2.8vw, 26px);
}

.page-about .about-note {
  margin: clamp(22px, 3.4vw, 32px) 0 0;
  font-size: var(--step--1);
  line-height: 1.7;
  color: var(--muted);
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

/* ---------- 收尾图 ---------- */
.page-about .about-signoff {
  margin: clamp(40px, 7vw, 80px) 0 0;
}

.page-about .about-signoff img {
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .team-media img {
    border-radius: 0;
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), 0 100%);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.85fr);
    gap: clamp(40px, 5vw, 72px);
  }

  .page-about .data-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

  .page-about .timeline-scroll {
    overflow-x: auto;
    padding-bottom: 22px;
    scrollbar-width: thin;
  }

  .page-about .timeline {
    display: flex;
    gap: clamp(16px, 2vw, 26px);
  }

  .page-about .timeline__item {
    flex: 1 1 0;
    min-width: 168px;
    padding: 34px 0 0;
  }

  .page-about .timeline__item::before {
    top: 9px;
    left: 0;
  }

  .page-about .timeline__item::after {
    left: 20px;
    top: 14px;
    right: calc(-1 * clamp(16px, 2vw, 26px));
    bottom: auto;
    width: auto;
    height: 1px;
    background: linear-gradient(90deg, var(--about-gold-line), rgba(232, 197, 122, 0.06));
  }
}

@media (min-width: 960px) {
  .page-about .chapter__grid {
    grid-template-columns: 84px minmax(0, 1fr);
    gap: clamp(24px, 3.4vw, 46px);
  }

  .page-about .chapter__mark {
    position: sticky;
    top: calc(var(--topbar-h) + 32px);
    align-self: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .col-tabs .tab,
  .page-about .team-tabs .tab {
    transition: none;
  }
}