.page-about {
  --about-amber-glow: rgba(245, 166, 35, 0.16);
  --about-peacock-glow: rgba(31, 182, 193, 0.15);
  --about-radius: 0;
  background: var(--ink);
  color: var(--ivory);
  overflow-x: clip;
}

.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 4vw, 40px) 0 clamp(40px, 6vw, 72px);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -20% -30% auto -10%;
  height: 120%;
  background:
    radial-gradient(52% 62% at 18% 26%, var(--about-amber-glow), transparent 68%),
    radial-gradient(46% 58% at 86% 14%, var(--about-peacock-glow), transparent 70%),
    linear-gradient(180deg, transparent 60%, var(--ink) 100%);
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(28px, 5vw, 52px);
  align-items: start;
}

.page-about .about-hero__copy .eyebrow {
  margin-bottom: 14px;
}

.page-about .about-hero__copy .h-hero {
  margin: 0 0 clamp(16px, 2.4vw, 24px);
}

.page-about .about-hero__copy .lede {
  max-width: 44ch;
  margin-bottom: clamp(22px, 3vw, 32px);
}

.page-about .about-hero__visual {
  margin: 0;
}

.page-about .about-quickbar {
  border-block: 1px solid var(--line-soft);
  background: linear-gradient(90deg, rgba(245, 166, 35, 0.08), rgba(31, 182, 193, 0.08));
}

.page-about .about-quickbar__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 24px;
  padding-block: clamp(14px, 2.4vw, 20px);
}

.page-about .about-quickbar__text {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-size: 15px;
  color: var(--mist);
  line-height: 1.6;
}

.page-about .about-quickbar__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-toc {
  border-bottom: 1px solid var(--line-soft);
  background: var(--ink-3);
}

.page-about .about-toc .shell {
  padding-block: 10px;
}

.page-about .about-toc__list {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

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

.page-about .about-toc__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid transparent;
  color: var(--mist);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  border-color: var(--line-gold);
  background: rgba(245, 166, 35, 0.1);
  color: var(--amber-soft);
}

.page-about .about-toc__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--amber);
}

.page-about .about-block {
  padding-block: clamp(48px, 8vw, 96px);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-block .section__head {
  max-width: 62ch;
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .about-block .section__head .h-section {
  margin: 0 0 clamp(14px, 2vw, 20px);
}

.page-about .about-block .section__head .lede {
  margin: 0;
}

/* 起点 */
.page-about .about-story {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-about .about-story__text p {
  margin: 0 0 1.05em;
}

.page-about .about-story__text p:last-child {
  margin-bottom: 0;
}

.page-about .about-story__aside {
  padding: clamp(20px, 3vw, 28px);
}

.page-about .about-story__aside-label {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .about-facts {
  margin: 0;
  display: grid;
  gap: 0;
}

.page-about .about-facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 0;
  border-top: 1px solid var(--line-gold);
}

.page-about .about-facts__row:last-child {
  border-bottom: 1px solid var(--line-gold);
}

.page-about .about-facts dt {
  margin: 0;
  font-size: 14px;
  color: var(--mist);
}

.page-about .about-facts dd {
  margin: 0;
  font-size: 15px;
  color: var(--ivory);
  text-align: right;
}

.page-about .about-facts dd.mono {
  color: var(--amber-soft);
  font-size: 16px;
}

/* 阵营切换 */
.page-about .camp-switch {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .camp-switch__input {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.page-about .camp-switch__tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--line);
}

.page-about .camp-switch__tab {
  padding: 15px 12px;
  text-align: center;
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--mist);
  border-bottom: 3px solid transparent;
  transition: color 0.18s ease, background 0.18s ease, border-color 0.18s ease;
}

.page-about .camp-switch__tab--beast {
  border-right: 1px solid var(--line);
}

.page-about .camp-switch__tab:hover {
  color: var(--ivory);
  background: rgba(232, 236, 245, 0.04);
}

.page-about .camp-switch__input:focus-visible ~ .camp-switch__tabs .camp-switch__tab {
  outline: 2px solid var(--amber);
  outline-offset: -4px;
}

.page-about #camp-beast:checked ~ .camp-switch__tabs .camp-switch__tab--beast {
  color: var(--ink);
  background: linear-gradient(180deg, var(--amber-soft), var(--amber));
  border-bottom-color: var(--amber-soft);
}

.page-about #camp-bird:checked ~ .camp-switch__tabs .camp-switch__tab--bird {
  color: var(--ink);
  background: linear-gradient(180deg, #6EDCE4, var(--peacock));
  border-bottom-color: #6EDCE4;
}

.page-about .camp-switch__media {
  margin: 0;
  border-left: 3px solid var(--amber);
  border-right: 3px solid var(--peacock);
}

.page-about .camp-switch__panels {
  display: grid;
}

.page-about .camp-switch__panel {
  display: none;
  padding: clamp(18px, 3vw, 26px) 0 0;
}

.page-about #camp-beast:checked ~ .camp-switch__panels .camp-switch__panel--beast {
  display: block;
  animation: about-fade 0.25s ease both;
}

.page-about #camp-bird:checked ~ .camp-switch__panels .camp-switch__panel--bird {
  display: block;
  animation: about-fade 0.25s ease both;
}

.page-about .camp-switch__panel .h-sub {
  margin: 0 0 12px;
}

.page-about .camp-switch__panel .prose {
  margin: 0 0 18px;
}

.page-about .camp-switch__panel--beast .h-sub {
  color: var(--amber-soft);
}

.page-about .camp-switch__panel--bird .h-sub {
  color: #6EDCE4;
}

@keyframes about-fade {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: none; }
}

.page-about .about-bullets {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-bullets li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-bullets li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 10px;
  height: 1px;
  background: var(--line-gold);
}

.page-about .camp-switch__panel--bird .about-bullets li::before {
  background: var(--peacock);
}

.page-about .about-camps__foot {
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding-top: clamp(18px, 3vw, 26px);
  border-top: 1px solid var(--line-soft);
  color: var(--mist);
}

/* 维护清单 */
.page-about .maint-list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: maint;
}

.page-about .maint-list__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px 18px;
  padding: clamp(18px, 3vw, 28px) 0;
  border-top: 1px solid var(--line-soft);
  transition: background 0.2s ease;
}

.page-about .maint-list__item:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .maint-list__item:hover,
.page-about .maint-list__item:focus-within {
  background: linear-gradient(90deg, rgba(31, 182, 193, 0.08), transparent 62%);
}

.page-about .maint-list__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--peacock);
  padding-top: 3px;
}

.page-about .maint-list__body .h-sub {
  margin: 0 0 10px;
  color: var(--ivory);
}

.page-about .maint-list__body p {
  margin: 0;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .maint-list__body .link-arrow {
  color: var(--amber-soft);
}

/* 团队 */
.page-about .team-layout {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-about .team-layout__media {
  margin: 0;
  border-bottom: 3px solid var(--peacock-deep);
}

.page-about .team-layout__folds {
  display: grid;
  gap: 0;
  align-content: start;
}

.page-about .about-fold {
  border-top: 1px solid var(--line-soft);
}

.page-about .about-fold:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-fold .fold__summary {
  padding: clamp(15px, 2.4vw, 20px) 0;
  font-size: 16px;
  color: var(--ivory);
  cursor: pointer;
  transition: color 0.16s ease;
}

.page-about .about-fold .fold__summary:hover {
  color: var(--amber-soft);
}

.page-about .about-fold .fold__body {
  padding: 0 0 clamp(18px, 2.6vw, 24px);
}

.page-about .about-fold .fold__body p {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 11px;
}

.page-about .about-steps li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist);
  padding-bottom: 11px;
  border-bottom: 1px dashed var(--line-soft);
}

.page-about .about-steps li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-steps .mono {
  color: var(--peacock);
  font-size: 13px;
  letter-spacing: 0.08em;
}

/* 承诺 */
.page-about .about-block--promise {
  background:
    linear-gradient(180deg, rgba(16, 26, 51, 0.9), rgba(7, 11, 24, 0.4)),
    radial-gradient(70% 90% at 84% 0%, rgba(255, 61, 139, 0.12), transparent 66%);
}

.page-about .promise-row {
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .promise {
  position: relative;
  padding: clamp(24px, 4vw, 36px) clamp(20px, 3vw, 30px);
  background: var(--ink-3);
  transition: background 0.2s ease;
}

.page-about .promise:hover {
  background: var(--ink-2);
}

.page-about .promise__mark {
  display: block;
  margin-bottom: 18px;
  color: var(--amber);
}

.page-about .promise__mark--peacock {
  color: var(--peacock);
}

.page-about .promise__mark--magenta {
  color: var(--magenta);
}

.page-about .promise .h-sub {
  margin: 0 0 12px;
  color: var(--ivory);
}

.page-about .promise p {
  margin: 0;
  max-width: 42ch;
  font-size: 15px;
  line-height: 1.76;
  color: var(--mist);
}

.page-about .promise p .link-arrow {
  color: var(--amber-soft);
}

.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* 收尾 */
.page-about .about-close {
  padding-block: clamp(48px, 7vw, 88px);
  background:
    linear-gradient(140deg, rgba(31, 182, 193, 0.14), transparent 58%),
    linear-gradient(320deg, rgba(245, 166, 35, 0.12), transparent 62%),
    var(--ink-2);
}

.page-about .about-close__inner {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  align-items: center;
}

.page-about .about-close__copy .h-section {
  margin: 0 0 14px;
}

.page-about .about-close__copy .lede {
  margin: 0;
  max-width: 50ch;
}

.page-about .about-close__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .link-arrow {
  color: var(--amber-soft);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  transition: color 0.15s ease;
}

.page-about .link-arrow:hover,
.page-about .link-arrow:focus-visible {
  color: var(--ivory);
}

.page-about a:focus-visible,
.page-about summary:focus-visible,
.page-about label:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

@media (min-width: 760px) {
  .page-about .about-close__inner {
    grid-template-columns: 1.15fr 0.85fr;
    justify-items: start;
  }

  .page-about .promise-row {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 920px) {
  .page-about .about-hero__inner {
    grid-template-columns: 5fr 7fr;
    gap: clamp(36px, 4.5vw, 72px);
  }

  .page-about .about-hero__visual {
    margin-top: clamp(24px, 3.6vw, 56px);
  }

  .page-about .about-story {
    grid-template-columns: 1.5fr 1fr;
    align-items: start;
  }

  .page-about .camp-switch {
    grid-template-columns: 1fr 1fr;
    grid-template-areas:
      "tabs tabs"
      "media panels";
    column-gap: clamp(28px, 4vw, 52px);
  }

  .page-about .camp-switch__tabs { grid-area: tabs; }
  .page-about .camp-switch__media { grid-area: media; }
  .page-about .camp-switch__panels { grid-area: panels; }

  .page-about .camp-switch__panel {
    padding-top: 0;
  }

  .page-about .maint-list__item {
    grid-template-columns: 64px 1fr;
    gap: 0 24px;
  }

  .page-about .team-layout {
    grid-template-columns: 1fr 1.05fr;
    align-items: start;
  }
}

@media (min-width: 1100px) {
  .page-about .about-quickbar__inner {
    padding-block: 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal],
  .page-about .camp-switch__panel {
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}