.page-about {
  position: relative;
  color: var(--paper);
  font-family: var(--font-cn);
  background:
    radial-gradient(760px 460px at 84% -6%, rgba(59, 130, 246, 0.22), transparent 68%),
    radial-gradient(560px 420px at 2% 8%, rgba(23, 166, 115, 0.12), transparent 66%),
    var(--night);
  padding-bottom: 72px;
  overflow-x: clip;
}

.page-about .breadcrumbs {
  padding: 18px 0 2px;
}

.page-about .about-hero {
  padding: 10px 0 46px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 32px;
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  font-size: clamp(2.3rem, 9vw, 4.5rem);
  line-height: 1.02;
  font-weight: 900;
  letter-spacing: -0.028em;
  color: var(--paper);
}

.page-about .about-hero__mark {
  display: inline-block;
  margin-top: 0.12em;
  background: linear-gradient(transparent 64%, rgba(244, 183, 64, 0.55) 64%);
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 54ch;
  color: var(--mist);
  font-size: 1.0625rem;
  line-height: 1.85;
}

.page-about .about-facts {
  list-style: none;
  margin: 28px 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-strong);
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
}

.page-about .about-facts li {
  background: rgba(12, 35, 64, 0.82);
  padding: 15px 14px;
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
}

.page-about .about-facts__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.45rem;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--flag-yellow);
}

.page-about .about-facts__label {
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .about-hero__actions {
  margin-top: 26px;
}

.page-about .about-hero__media {
  position: relative;
  padding: 8px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-card);
  background: rgba(12, 35, 64, 0.62);
  box-shadow:
    14px 14px 0 -6px rgba(3, 10, 18, 0.7),
    0 0 0 1px rgba(247, 250, 255, 0.05);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 14px;
  object-fit: cover;
}

.page-about .about-hero__media .media-frame__cap {
  padding: 10px 4px 2px;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-body {
  display: grid;
  gap: 34px;
  padding-top: 4px;
}

/* 章节索引 */
.page-about .about-toc {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px 12px;
  background: rgba(12, 35, 64, 0.6);
  min-width: 0;
}

.page-about .about-toc__title {
  margin: 0 0 10px;
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist);
}

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

.page-about .about-toc__list li {
  flex: 0 0 auto;
}

.page-about .about-toc__link {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 8px 11px;
  border-radius: 10px;
  color: var(--mist);
  text-decoration: none;
  font-size: 0.9rem;
  white-space: nowrap;
  transition: background 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .about-toc__link .mono {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--flag-blue);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible,
.page-about .about-toc__link[aria-current="true"] {
  background: rgba(59, 130, 246, 0.18);
  color: var(--paper);
}

/* 章节 */
.page-about .about-flow {
  min-width: 0;
}

.page-about .about-sec {
  padding: 28px 0 34px;
  border-top: 1px solid var(--line);
}

.page-about .about-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-sec__title {
  margin: 14px 0 0;
  font-size: clamp(1.5rem, 5vw, 2.15rem);
  line-height: 1.22;
  font-weight: 800;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .about-p {
  margin: 16px 0 0;
  max-width: 62ch;
  color: var(--mist);
  font-size: 1rem;
  line-height: 1.85;
}

.page-about .about-figure {
  margin: 26px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-card);
  object-fit: cover;
}

.page-about .about-figure .media-frame__cap {
  margin-top: 10px;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--mist);
}

/* 时间线 */
.page-about .era {
  list-style: none;
  margin: 28px 0 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .era::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--flag-blue), rgba(59, 130, 246, 0.06));
}

.page-about .era__item {
  position: relative;
  margin-bottom: 12px;
}

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

.page-about .era__item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 18px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--night);
  border: 2px solid var(--flag-blue);
  box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.14);
}

.page-about .era__box {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(12, 35, 64, 0.62);
  overflow: hidden;
  transition: border-color 0.25s var(--ease);
}

.page-about .era__box[open] {
  border-color: rgba(59, 130, 246, 0.45);
}

.page-about .era__sum {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .era__sum::-webkit-details-marker {
  display: none;
}

.page-about .era__sum::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  line-height: 1;
  color: var(--flag-blue);
}

.page-about .era__box[open] .era__sum::after {
  content: "\2212";
}

.page-about .era__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.9rem;
  padding: 2px 9px;
  border-radius: var(--radius-pill);
  color: var(--flag-yellow);
  background: rgba(244, 183, 64, 0.12);
  border: 1px solid rgba(244, 183, 64, 0.32);
}

.page-about .era__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .era__text {
  margin: 0;
  padding: 0 16px 16px;
  color: var(--mist);
  font-size: 0.9375rem;
  line-height: 1.8;
}

/* 三步流程 */
.page-about .steps {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.page-about .step {
  padding: 18px 18px 20px;
  border-radius: 16px;
  border: 1px solid var(--line);
  border-top-width: 3px;
  background: rgba(12, 35, 64, 0.74);
}

.page-about .step--blue {
  border-top-color: var(--flag-blue);
}

.page-about .step--green {
  border-top-color: var(--flag-green);
}

.page-about .step--yellow {
  border-top-color: var(--flag-yellow);
}

.page-about .step__no {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .step h3 {
  margin: 10px 0 8px;
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--paper);
}

.page-about .step p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--mist);
}

/* 团队 */
.page-about .team {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.page-about .team__card {
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 18px 18px 20px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(12, 35, 64, 0.92), rgba(6, 22, 43, 0.92));
}

.page-about .team__tag {
  align-self: flex-start;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  border: 1px solid currentColor;
  color: var(--flag-blue);
}

.page-about .team__tag--green {
  color: var(--flag-green);
}

.page-about .team__tag--yellow {
  color: var(--flag-yellow);
}

.page-about .team__tag--red {
  color: var(--flag-red);
}

.page-about .team__card h3 {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 800;
  color: var(--paper);
}

.page-about .team__card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--mist);
}

/* 2026 改版 */
.page-about .revamp {
  margin-top: 24px;
  padding: 20px 18px 22px;
  border-radius: var(--radius-card);
  border: 1px solid rgba(244, 183, 64, 0.3);
  background:
    radial-gradient(420px 260px at 100% 0%, rgba(244, 183, 64, 0.16), transparent 70%),
    rgba(12, 35, 64, 0.7);
}

.page-about .revamp ol {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: rv;
  display: grid;
  gap: 13px;
}

.page-about .revamp li {
  position: relative;
  padding-left: 36px;
  color: var(--mist);
  font-size: 0.9375rem;
  line-height: 1.8;
}

.page-about .revamp li::before {
  counter-increment: rv;
  content: counter(rv, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.2em;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--flag-yellow);
}

.page-about .revamp strong {
  color: var(--paper);
  font-weight: 700;
}

/* 支持与联系 */
.page-about .support-grid {
  display: grid;
  gap: 12px;
  margin-top: 24px;
}

.page-about .support-link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(12, 35, 64, 0.62);
  color: var(--paper);
  text-decoration: none;
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .support-link:hover,
.page-about .support-link:focus-visible {
  border-color: rgba(59, 130, 246, 0.5);
  background: rgba(59, 130, 246, 0.12);
  transform: translateY(-2px);
}

.page-about .support-link strong {
  font-size: 0.98rem;
  font-weight: 800;
}

.page-about .support-link span {
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .contact-card {
  margin-top: 16px;
  padding: 20px 18px;
  border-radius: var(--radius-card);
  border: 1px solid var(--line-strong);
  background: rgba(3, 10, 18, 0.55);
}

.page-about .contact-card__title {
  margin: 0 0 14px;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--paper);
}

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

.page-about .contact-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 14px;
  font-size: 0.9375rem;
  color: var(--mist);
  overflow-wrap: anywhere;
}

.page-about .contact-list .k {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--flag-blue);
}

@media (min-width: 640px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 760px) {
  .page-about .team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 18px 0 60px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 52px;
    align-items: center;
  }
}

@media (min-width: 960px) {
  .page-about {
    padding-bottom: 96px;
  }

  .page-about .about-body {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: 96px;
    padding: 16px 14px;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
  }

  .page-about .about-toc__link {
    white-space: normal;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .support-link,
  .page-about .about-toc__link,
  .page-about .era__box {
    transition: none;
  }

  .page-about .support-link:hover {
    transform: none;
  }
}