.page-about {
  --about-orange-deep: #A9521B;
  --about-ink-soft: rgba(246, 243, 236, 0.76);
  --about-line-soft: rgba(232, 227, 216, 0.18);
  --about-gutter: clamp(18px, 4vw, 40px);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  max-width: var(--shell-wide);
  margin-inline: auto;
  padding: calc(var(--header-h) + 20px) var(--about-gutter) 4px;
}
.page-about .about-crumb .breadcrumb {
  margin: 0;
}

/* ---------- 开篇 ---------- */
.page-about .about-opening {
  padding-block: clamp(36px, 5vw, 68px) clamp(38px, 5.5vw, 72px);
  position: relative;
  overflow: hidden;
}
.page-about .about-opening__stage {
  display: grid;
  gap: clamp(18px, 3vw, 38px);
  align-items: end;
}
.page-about .about-opening__years {
  display: flex;
  align-items: baseline;
  gap: 0.14em;
  font-family: var(--font-display);
  font-weight: 200;
  line-height: 0.84;
  letter-spacing: -0.035em;
  font-variant-numeric: tabular-nums;
  min-width: 0;
}
.page-about .about-year {
  font-size: clamp(56px, 13vw, 164px);
  color: rgba(232, 227, 216, 0.24);
  transition: color 240ms ease;
}
.page-about .about-year--end {
  color: var(--cyan);
  opacity: 0.88;
}
.page-about .about-opening__statement {
  min-width: 0;
}
.page-about .about-opening__statement h1 {
  margin: 0 0 18px;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: clamp(28px, 4.6vw, 52px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--card);
}
.page-about .about-opening__statement .lede {
  margin: 0;
  color: var(--about-ink-soft);
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.9;
  max-width: 62ch;
}

.page-about .about-opening__index {
  list-style: none;
  margin: clamp(32px, 4.5vw, 56px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  border-top: 1px solid var(--about-line-soft);
}
.page-about .about-opening__index li {
  border-bottom: 1px solid var(--about-line-soft);
  min-width: 0;
}
.page-about .about-opening__index a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px 2px;
  color: rgba(246, 243, 236, 0.84);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.5;
  transition: color 160ms ease, padding-left 160ms ease;
}
.page-about .about-opening__index a:hover,
.page-about .about-opening__index a:focus-visible {
  color: var(--cyan);
  padding-left: 8px;
}
.page-about .about-idx {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--lime);
  flex: none;
}

/* ---------- 赛季沿革 ---------- */
.page-about .about-track {
  background:
    repeating-linear-gradient(
      114deg,
      transparent 0 46px,
      rgba(199, 191, 176, 0.16) 46px 47px
    ),
    var(--paper);
  padding-block: clamp(44px, 6vw, 84px);
}
.page-about .about-track__title {
  margin: 0 0 clamp(24px, 3.5vw, 42px);
  color: var(--ink);
}
.page-about .about-track__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}
.page-about .about-track__item {
  display: grid;
  gap: 4px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
  min-width: 0;
}
.page-about .about-track__item:first-child {
  border-top: 1px solid var(--line);
}
.page-about .about-track__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--teal);
  transition: color 240ms ease;
}
.page-about .about-track__item.is-visible .about-track__year {
  color: var(--about-orange-deep);
}
.page-about .about-track__body {
  font-size: 15px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 编辑部 ---------- */
.page-about .about-team {
  padding-block: clamp(46px, 6.5vw, 92px);
}
.page-about .about-team__grid {
  gap: clamp(26px, 4vw, 56px);
  align-items: start;
}
.page-about .about-team__copy h2 {
  margin: 6px 0 18px;
  color: var(--ink);
}
.page-about .about-team__copy .prose {
  color: var(--muted);
  max-width: 60ch;
}
.page-about .about-roles {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}
.page-about .about-role {
  border-left: 3px solid var(--line);
  padding: 2px 0 2px 18px;
}
.page-about .about-role:nth-child(1) { border-left-color: var(--orange); }
.page-about .about-role:nth-child(2) { border-left-color: var(--teal); }
.page-about .about-role:nth-child(3) { border-left-color: var(--wine); }
.page-about .about-role__meta {
  margin: 0 0 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--about-orange-deep);
}
.page-about .about-role__title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 17px;
  line-height: 1.4;
  color: var(--ink);
}
.page-about .about-role p {
  margin: 6px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}
.page-about .about-team__note {
  margin: 26px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}
.page-about .about-team__link {
  margin: 18px 0 0;
  font-size: 14px;
}
.page-about .about-team__link a,
.page-about .about-coverage__link a,
.page-about .about-flow__link a,
.page-about .about-standards__link a {
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 2px;
}
.page-about .about-team__link a {
  color: var(--teal);
}
.page-about .about-team__figure {
  margin: 0;
}
.page-about .about-team__figure .image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 出品流程 ---------- */
.page-about .about-flow {
  padding-block: clamp(48px, 6.5vw, 96px);
}
.page-about .about-flow__eyebrow {
  color: var(--cyan);
}
.page-about .about-flow h2 {
  margin: 6px 0 16px;
  color: var(--card);
}
.page-about .about-flow__lede {
  margin: 0 0 clamp(28px, 4vw, 48px);
  color: var(--about-ink-soft);
  max-width: 58ch;
}
.page-about .about-flow__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  counter-reset: flow;
}
.page-about .about-flow__step {
  position: relative;
  padding: 22px 0 6px;
  border-top: 1px solid rgba(232, 227, 216, 0.22);
  min-width: 0;
}
.page-about .about-flow__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  font-weight: 500;
  line-height: 1;
  color: var(--lime);
  letter-spacing: 0.02em;
}
.page-about .about-flow__step-title {
  margin: 10px 0 6px;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 17px;
  line-height: 1.4;
  color: var(--card);
}
.page-about .about-flow__step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-ink-soft);
}
.page-about .about-flow__arrow {
  display: block;
  width: 12px;
  height: 40px;
  margin: 12px 0 4px 8px;
  color: rgba(59, 224, 198, 0.55);
}
.page-about .about-flow__link {
  margin: clamp(26px, 3.5vw, 40px) 0 0;
  font-size: 14px;
}
.page-about .about-flow__link a {
  color: var(--cyan);
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-coverage {
  background: var(--paper);
  padding-block: clamp(46px, 6.5vw, 92px);
}
.page-about .about-coverage h2 {
  margin: 6px 0 16px;
  color: var(--ink);
}
.page-about .about-coverage__lede {
  margin: 0 0 clamp(24px, 3.5vw, 36px);
  color: var(--muted);
  max-width: 56ch;
}
.page-about .about-tabs__list {
  margin-bottom: clamp(20px, 3vw, 30px);
}
.page-about .about-tabs__btn {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0.01em;
}
.page-about .about-tabs__panel[hidden] {
  display: none;
}
.page-about .about-cov-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}
.page-about .about-cov-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 18px;
  align-items: baseline;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}
.page-about .about-cov-count {
  font-size: 30px;
  font-weight: 500;
  line-height: 1;
  color: var(--teal);
  letter-spacing: -0.01em;
}
.page-about .about-cov-text {
  display: block;
  min-width: 0;
}
.page-about .about-cov-name {
  display: block;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 16px;
  line-height: 1.4;
  color: var(--ink);
}
.page-about .about-cov-note {
  display: block;
  margin-top: 4px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}
.page-about .about-figures {
  display: grid;
  gap: 1px;
  margin-top: clamp(30px, 4vw, 50px);
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.page-about .about-figure {
  background: var(--card);
  padding: 22px 20px 24px;
}
.page-about .about-figure__num {
  font-size: clamp(34px, 4.4vw, 50px);
  font-weight: 500;
  line-height: 1;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.page-about .about-figure__unit {
  margin-left: 0.35em;
  font-size: 14px;
  color: var(--about-orange-deep);
}
.page-about .about-figure__label {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}
.page-about .about-coverage__link {
  margin: 26px 0 0;
  font-size: 14px;
}
.page-about .about-coverage__link a {
  color: var(--teal);
}

/* ---------- 伙伴与里程碑 ---------- */
.page-about .about-partners {
  padding-block: clamp(46px, 6.5vw, 92px);
}
.page-about .about-partners__eyebrow {
  color: var(--cyan);
}
.page-about .about-partners h2 {
  margin: 6px 0 clamp(24px, 3.5vw, 38px);
  color: var(--card);
}
.page-about .about-partners__figure {
  margin: 0 0 clamp(28px, 4vw, 48px);
}
.page-about .about-partners__figure .image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.page-about .about-partners__figure .figure__caption {
  color: var(--about-ink-soft);
}
.page-about .about-partner-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  border-top: 1px solid var(--about-line-soft);
}
.page-about .about-partner-list li {
  display: grid;
  gap: 6px;
  padding: 20px 0;
  border-bottom: 1px solid var(--about-line-soft);
  min-width: 0;
}
.page-about .about-partner-key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--lime);
}
.page-about .about-partner-text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

/* ---------- 标注与反馈 ---------- */
.page-about .about-standards {
  padding-block: clamp(46px, 6.5vw, 92px);
}
.page-about .about-standards h2 {
  margin: 6px 0 16px;
  color: var(--ink);
}
.page-about .about-standards .prose {
  color: var(--muted);
}
.page-about .about-standards__grid {
  display: grid;
  gap: clamp(22px, 3vw, 32px);
  margin-top: clamp(26px, 3.5vw, 42px);
}
.page-about .about-standard {
  border-top: 2px solid var(--line);
  padding-top: 16px;
  min-width: 0;
}
.page-about .about-standard:nth-child(1) { border-top-color: var(--orange); }
.page-about .about-standard:nth-child(2) { border-top-color: var(--teal); }
.page-about .about-standard:nth-child(3) { border-top-color: var(--indigo); }
.page-about .about-standard:nth-child(4) { border-top-color: var(--wine); }
.page-about .about-standard__title {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 17px;
  line-height: 1.4;
  color: var(--ink);
}
.page-about .about-standard p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}
.page-about .about-standards__link {
  margin: 30px 0 0;
  font-size: 14px;
}
.page-about .about-standards__link a {
  color: var(--wine);
}

/* ---------- 收尾 ---------- */
.page-about .about-closing {
  padding-block: clamp(46px, 6.5vw, 92px);
}
.page-about .about-closing__figure {
  margin: 0;
}
.page-about .about-closing__figure .image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.page-about .about-closing__copy {
  margin-top: clamp(28px, 4vw, 48px);
  max-width: 70ch;
}
.page-about .about-closing__copy h2 {
  margin: 0 0 16px;
  color: var(--card);
}
.page-about .about-closing__copy .prose {
  margin: 0;
  color: var(--about-ink-soft);
}
.page-about .about-closing__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: clamp(24px, 3vw, 34px) 0 0;
}
.page-about .about-closing__actions .btn {
  text-decoration: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-opening__index {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-opening__index li:nth-last-child(-n+1) {
    grid-column: 1 / -1;
  }
  .page-about .about-figures {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 780px) {
  .page-about .about-track__item {
    grid-template-columns: 96px minmax(0, 1fr);
    align-items: baseline;
    gap: 20px;
    padding: 14px 0;
  }
  .page-about .about-track__item:nth-child(even) {
    padding-left: 5%;
  }
  .page-about .about-track__item:nth-child(odd) {
    padding-left: 1.6%;
  }
  .page-about .about-partner-list li {
    grid-template-columns: minmax(0, 0.26fr) minmax(0, 0.74fr);
    gap: 24px;
    align-items: baseline;
  }
  .page-about .about-standards__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-opening__stage {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    gap: clamp(32px, 5vw, 72px);
  }
  .page-about .about-opening__index {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
  .page-about .about-opening__index li:nth-last-child(-n+1) {
    grid-column: auto;
  }
  .page-about .about-opening__index a {
    flex-direction: column;
    gap: 6px;
    padding: 16px 12px 18px 0;
  }
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  }
  .page-about .about-flow__list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0 24px;
  }
  .page-about .about-flow__step {
    padding-top: 24px;
  }
  .page-about .about-flow__arrow {
    display: none;
  }
  .page-about .about-flow__step:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 34px;
    right: -22px;
    width: 20px;
    height: 1px;
    background: rgba(59, 224, 198, 0.45);
  }
}

@media (min-width: 1080px) {
  .page-about .about-cov-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 36px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 1ms !important;
    animation-duration: 1ms !important;
  }
}