.page-about {
  background: var(--c-deep);
  color: var(--c-mist);
  padding-bottom: 64px;
}

.page-about .about-hero {
  position: relative;
  padding: 28px 0 48px;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 12% 0%, rgba(242, 193, 78, 0.1), transparent 52%),
    radial-gradient(ellipse at 88% 100%, rgba(255, 122, 61, 0.07), transparent 55%),
    var(--c-deep);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(138, 151, 171, 0.2) 1px, transparent 1px);
  background-size: 28px 28px;
  opacity: 0.32;
  pointer-events: none;
  -webkit-mask-image: radial-gradient(ellipse at 50% 35%, #000 0%, transparent 72%);
  mask-image: radial-gradient(ellipse at 50% 35%, #000 0%, transparent 72%);
}

.page-about .about-hero > .container {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__frame {
  margin-top: 18px;
  padding: 30px 20px;
  border: 1px solid var(--line);
  background:
    linear-gradient(158deg, rgba(14, 26, 43, 0.94), rgba(7, 11, 20, 0.97));
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(28px, 6.2vw, 58px);
  line-height: 1.14;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--c-mist);
  max-width: 22ch;
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(233, 237, 245, 0.82);
}

.page-about .about-hero__stats {
  margin-top: 28px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px;
  background: rgba(7, 11, 20, 0.76);
}

.page-about .about-stat__num {
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-gold);
}

.page-about .about-stat__label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-steel);
}

/* 档案阅读骨架 */
.page-about .about-archive {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-top: 40px;
}

/* 左侧索引栏 */
.page-about .about-rail {
  border-bottom: 1px solid var(--line-soft);
  padding-bottom: 10px;
}

.page-about .about-rail__label {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-steel);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 2px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 12px;
  white-space: nowrap;
  text-decoration: none;
  font-size: 14px;
  color: var(--c-steel);
  border-bottom: 2px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-rail__link:hover {
  color: var(--c-mist);
}

.page-about .about-rail__no {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--c-signal);
}

.page-about .about-rail__link[aria-current="true"] {
  color: var(--c-gold);
  border-color: var(--c-gold);
}

.page-about .about-rail__link[aria-current="true"] .about-rail__no {
  color: var(--c-gold);
}

.page-about .about-rail__cta {
  display: none;
}

.page-about .about-rail__cta p {
  margin: 0 0 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-steel);
}

/* 章节区块 */
.page-about .about-block {
  padding: 36px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-block:first-child {
  border-top: none;
  padding-top: 0;
}

.page-about .about-block .section-head {
  margin-bottom: 20px;
}

.page-about .about-block .section-head__title {
  margin: 8px 0 0;
  font-size: clamp(21px, 3.6vw, 32px);
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--c-mist);
}

.page-about .about-block .eyebrow {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-steel);
}

.page-about .about-copy {
  font-size: 15px;
  line-height: 1.85;
  color: rgba(233, 237, 245, 0.84);
}

.page-about .about-copy p {
  margin: 0 0 14px;
}

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

.page-about .about-copy--after {
  margin-top: 20px;
}

.page-about .about-copy a {
  color: var(--c-gold);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-note {
  margin: 18px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--c-signal);
  font-size: 14px;
  line-height: 1.78;
  color: var(--c-steel);
}

/* 图片 */
.page-about .about-block__media {
  margin: 22px 0;
}

.page-about .media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--c-night);
}

.page-about .media__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.04);
}

.page-about .media__caption {
  margin: 0;
  padding: 10px 14px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-steel);
  background: rgba(7, 11, 20, 0.7);
  border-top: 1px solid var(--line-soft);
}

/* 对照表 */
.page-about .table-wrap {
  margin: 20px 0 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--line);
  background: rgba(14, 26, 43, 0.55);
}

.page-about .compare {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: 14px;
  line-height: 1.68;
}

.page-about .compare__caption {
  caption-side: top;
  text-align: left;
  padding: 12px 16px;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-steel);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .compare th {
  text-align: left;
  padding: 13px 16px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  white-space: nowrap;
  color: var(--c-gold);
  background: rgba(27, 22, 56, 0.42);
  border-bottom: 1px solid var(--line);
}

.page-about .compare td {
  padding: 15px 16px;
  vertical-align: top;
  color: rgba(233, 237, 245, 0.82);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .compare tbody tr:last-child td {
  border-bottom: none;
}

.page-about .compare td:first-child {
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-mist);
}

/* V3 分类卡 */
.page-about .v3-grid {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .v3-card {
  padding: 20px 18px;
  background: linear-gradient(168deg, rgba(11, 43, 43, 0.86), rgba(7, 11, 20, 0.94));
}

.page-about .v3-card:nth-child(3n + 2) {
  background: linear-gradient(168deg, rgba(27, 22, 56, 0.86), rgba(7, 11, 20, 0.94));
}

.page-about .v3-card:nth-child(3n) {
  background: linear-gradient(168deg, rgba(58, 18, 32, 0.68), rgba(7, 11, 20, 0.94));
}

.page-about .v3-card__no {
  display: block;
  margin-bottom: 10px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-signal);
}

.page-about .v3-card__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--c-mist);
}

.page-about .v3-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-steel);
}

/* 角色卡 */
.page-about .role-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 22px 0;
}

.page-about .role-card {
  padding: 18px 16px;
  background: var(--c-night);
  border: 1px solid var(--line-soft);
  border-top: 2px solid var(--c-gold);
}

.page-about .role-card:nth-child(2) {
  border-top-color: var(--c-amber);
}

.page-about .role-card:nth-child(3) {
  border-top-color: var(--c-signal);
}

.page-about .role-card:nth-child(4) {
  border-top-color: var(--c-brick);
}

.page-about .role-card__tag {
  display: inline-block;
  margin-bottom: 10px;
}

.page-about .role-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(233, 237, 245, 0.8);
}

/* 版本时间线 */
.page-about .version-list {
  position: relative;
  margin: 22px 0 0;
  padding-left: 26px;
}

.page-about .version-list::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(to bottom, var(--c-gold), var(--c-signal), rgba(138, 151, 171, 0.25));
}

.page-about .version {
  position: relative;
  padding-bottom: 26px;
}

.page-about .version:last-child {
  padding-bottom: 0;
}

.page-about .version::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 5px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--c-deep);
  border: 2px solid var(--c-gold);
  box-shadow: 0 0 0 3px rgba(242, 193, 78, 0.14);
}

.page-about .version__no {
  display: block;
  margin-bottom: 6px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--c-gold);
}

.page-about .version__title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--c-mist);
}

.page-about .version__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(233, 237, 245, 0.8);
}

/* 合作生态 */
.page-about .partner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 22px 0;
}

.page-about .partner-card {
  padding: 20px 18px;
  background: rgba(27, 22, 56, 0.5);
  border: 1px solid rgba(138, 151, 171, 0.18);
}

.page-about .partner-card__title {
  margin: 0 0 10px;
  font-size: 16px;
  font-weight: 700;
  color: var(--c-gold);
}

.page-about .partner-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(233, 237, 245, 0.78);
}

.page-about .service-list {
  margin: 24px 0;
  padding: 20px 18px;
  background: rgba(11, 43, 43, 0.42);
  border-left: 3px solid var(--c-signal);
}

.page-about .service-list__title {
  margin: 0 0 14px;
  font-size: 16px;
  font-weight: 700;
  color: var(--c-mist);
}

.page-about .service-list ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .service-list li {
  position: relative;
  padding-left: 14px;
  margin-bottom: 10px;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(233, 237, 245, 0.8);
}

.page-about .service-list li:last-child {
  margin-bottom: 0;
}

.page-about .service-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 5px;
  height: 5px;
  background: var(--c-signal);
}

.page-about .service-list strong {
  color: var(--c-mist);
  font-weight: 600;
}

.page-about .honor-strip {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 24px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .honor-strip__item {
  padding: 18px 16px;
  background: var(--c-night);
}

.page-about .honor-strip__year {
  display: block;
  margin-bottom: 8px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--c-gold);
}

.page-about .honor-strip__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(233, 237, 245, 0.8);
}

/* 结尾行动区 */
.page-about .about-cta {
  margin-top: 40px;
}

.page-about .about-cta__inner {
  padding: 30px 20px;
  border: 1px solid var(--line);
  background:
    radial-gradient(ellipse at 92% 6%, rgba(242, 193, 78, 0.14), transparent 58%),
    linear-gradient(158deg, rgba(14, 26, 43, 0.96), rgba(7, 11, 20, 0.98));
}

.page-about .about-cta__inner .eyebrow {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-steel);
}

.page-about .about-cta__title {
  margin: 10px 0 14px;
  font-size: clamp(21px, 3.4vw, 30px);
  line-height: 1.32;
  font-weight: 700;
  color: var(--c-mist);
}

.page-about .about-cta__lead {
  margin: 0 0 20px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(233, 237, 245, 0.8);
}

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

.page-about .about-cta__hint {
  margin: 18px 0 0;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-steel);
}

.page-about .about-cta__hint a {
  color: var(--c-signal);
  text-decoration: none;
}

.page-about .about-cta__hint a:hover {
  text-decoration: underline;
}

/* 滚动显现 */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

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

@media (min-width: 640px) {
  .page-about .about-hero__frame {
    padding: 38px 32px;
  }

  .page-about .about-hero__lead {
    font-size: 16px;
  }

  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-stat__num {
    font-size: 32px;
  }

  .page-about .v3-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

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

  .page-about .about-cta__inner {
    padding: 38px 32px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-hero {
    padding: 36px 0 64px;
  }

  .page-about .about-archive {
    grid-template-columns: 236px minmax(0, 1fr);
    gap: 52px;
    align-items: start;
    margin-top: 48px;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--cmd-h) + 24px);
    align-self: start;
    border-bottom: none;
    border-left: 1px solid var(--line);
    padding: 0 0 0 18px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    overflow: visible;
    gap: 0;
  }

  .page-about .about-rail__link {
    padding: 9px 0;
    border-bottom: none;
    border-left: 2px solid transparent;
    margin-left: -20px;
    padding-left: 18px;
  }

  .page-about .about-rail__link[aria-current="true"] {
    border-color: var(--c-gold);
  }

  .page-about .about-rail__cta {
    display: block;
    margin-top: 22px;
    padding: 16px 14px;
    background: var(--glass);
    border: 1px solid var(--line-soft);
  }

  .page-about .about-rail__cta .btn {
    width: 100%;
    text-align: center;
  }

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

  .page-about .v3-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-cta {
    margin-top: 48px;
  }
}

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

  .page-about .about-rail__link {
    transition: none;
  }
}