.page-about {
  --about-rail: 236px;
  --about-gap: clamp(26px, 4vw, 60px);
  --about-pad: clamp(38px, 6vw, 78px);
  --about-radius: 16px;
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(120% 100% at 86% 2%, rgba(55, 242, 214, .10), transparent 56%),
    radial-gradient(85% 95% at 4% 0%, rgba(215, 168, 74, .14), transparent 62%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(215, 168, 74, .6), rgba(55, 242, 214, .55), transparent);
}

.page-about .about-hero .wrap {
  padding-block: clamp(26px, 4vw, 46px) clamp(38px, 6vw, 78px);
}

.page-about .about-hero__grid {
  margin-top: clamp(24px, 3.4vw, 44px);
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  gap: clamp(26px, 4vw, 54px);
  align-items: end;
}

.page-about .about-hero__intro h1 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(28px, 5vw, 54px);
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--c-paper);
  text-wrap: balance;
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 58ch;
  font-size: clamp(15px, 1.35vw, 17px);
  line-height: 1.9;
  color: var(--c-mist);
}

.page-about .about-hero__actions {
  margin-top: clamp(22px, 3vw, 34px);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .stat {
  padding: 16px 15px;
  background: linear-gradient(158deg, rgba(8, 36, 58, .94), rgba(4, 17, 31, .94));
  border: var(--hair);
  clip-path: var(--clip-corner-sm);
}

.page-about .stat__num {
  display: block;
  font-size: clamp(20px, 2vw, 25px);
  font-weight: 600;
  color: var(--c-gold-300);
  letter-spacing: -.01em;
}

.page-about .stat__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--c-mist);
}

/* ---------- 主体双列骨架 ---------- */
.page-about .about-body {
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
  padding-block: clamp(30px, 4vw, 56px) clamp(44px, 6vw, 88px);
  display: grid;
  grid-template-columns: var(--about-rail) minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-body__aside {
  position: sticky;
  top: 132px;
  align-self: start;
}

.page-about .about-body__main {
  min-width: 0;
}

.page-about .about-track__title {
  margin: 0 0 10px;
  padding-left: 13px;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--c-neon-400);
  text-transform: uppercase;
}

.page-about .about-track__list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: aboutn;
}

.page-about .about-track__list li {
  border-left: 1px solid rgba(14, 58, 90, .95);
}

.page-about .about-track__list a {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 11px 12px;
  margin-left: -1px;
  border-left: 2px solid transparent;
  font-size: 14px;
  line-height: 1.4;
  color: var(--c-mist);
  text-decoration: none;
  transition: color .25s ease, border-color .25s ease, background-color .25s ease;
}

.page-about .about-track__list a .mono {
  font-size: 12px;
  color: var(--c-ink-700);
  transition: color .25s ease;
}

.page-about .about-track__list a:hover,
.page-about .about-track__list a:focus-visible {
  color: var(--c-paper);
  background: rgba(8, 36, 58, .6);
}

.page-about .about-track__list a[aria-current="true"] {
  border-left-color: var(--c-gold-500);
  color: var(--c-gold-300);
  background: rgba(8, 36, 58, .7);
}

.page-about .about-track__list a[aria-current="true"] .mono {
  color: var(--c-neon-400);
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding-block: var(--about-pad);
  border-top: var(--hair);
}

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

.page-about .about-sec .section__head {
  max-width: 64ch;
  margin-bottom: clamp(22px, 3vw, 36px);
}

.page-about .about-sec .section__title {
  margin-top: 10px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(22px, 2.8vw, 34px);
  line-height: 1.34;
  color: var(--c-paper);
}

.page-about .about-sec .section__lead {
  margin-top: 14px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--c-mist);
}

.page-about .about-origin__prose p {
  margin: 0 0 1em;
  font-size: 16px;
  line-height: 1.95;
  color: var(--c-mist);
}

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

.page-about .about-figure {
  margin: clamp(24px, 3vw, 38px) 0 0;
}

/* ---------- 五个接待环节 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: clamp(24px, 3.2vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
}

.page-about .about-steps li {
  position: relative;
  padding: 15px 13px 15px 13px;
  background: linear-gradient(158deg, rgba(8, 36, 58, .8), rgba(4, 17, 31, .8));
  border: var(--hair);
  clip-path: var(--clip-corner-sm);
  font-size: 14px;
  line-height: 1.5;
  color: var(--c-paper);
}

.page-about .about-steps li .mono {
  display: block;
  margin-bottom: 7px;
  font-size: 12px;
  color: var(--c-gold-500);
  letter-spacing: .08em;
}

.page-about .about-steps li::after {
  content: "";
  position: absolute;
  right: -6px;
  top: 50%;
  width: 6px;
  height: 1px;
  background: var(--c-neon-400);
  opacity: .8;
}

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

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--c-gold-500), rgba(55, 242, 214, .5) 58%, rgba(14, 58, 90, 0) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 30px;
  padding-bottom: clamp(22px, 3vw, 34px);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 7px;
  width: 10px;
  height: 10px;
  background: var(--c-ink-900);
  border: 2px solid var(--c-gold-500);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(4, 17, 31, .9);
}

.page-about .about-timeline__year {
  display: inline-block;
  font-size: 19px;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--c-gold-300);
}

.page-about .about-timeline__body h3 {
  margin: 6px 0 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.45;
  color: var(--c-paper);
}

.page-about .about-timeline__body p {
  margin: 8px 0 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--c-mist);
}

.page-about .about-versions {
  margin-top: clamp(26px, 3.4vw, 42px);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.page-about .about-versions__cell {
  padding: 16px 15px;
  border: 1px solid rgba(55, 242, 214, .28);
  border-left: 2px solid var(--c-neon-400);
  background: rgba(8, 36, 58, .5);
  clip-path: var(--clip-corner-sm);
}

.page-about .about-versions__num {
  display: block;
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 600;
  color: var(--c-paper);
}

.page-about .about-versions__cap {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--c-mist);
}

/* ---------- 团队 ---------- */
.page-about .about-team__split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
  gap: clamp(24px, 3.4vw, 46px);
  align-items: start;
}

.page-about .about-team__split .about-figure {
  margin-top: 0;
}

.page-about .about-roles {
  display: grid;
  gap: 12px;
}

.page-about .about-role {
  position: relative;
  padding: 18px 18px 18px 22px;
  background: linear-gradient(150deg, rgba(8, 36, 58, .9), rgba(4, 17, 31, .85));
  border: var(--hair);
  clip-path: var(--clip-corner);
  transition: transform .3s ease, border-color .3s ease;
}

.page-about .about-role::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--c-gold-500), rgba(55, 242, 214, .6));
}

.page-about .about-role:hover {
  transform: translateY(-3px);
  border-color: rgba(215, 168, 74, .55);
}

.page-about .about-role__num {
  font-size: 24px;
  font-weight: 600;
  color: var(--c-gold-300);
}

.page-about .about-role__title {
  margin: 4px 0 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 17px;
  color: var(--c-paper);
}

.page-about .about-role__text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--c-mist);
}

/* ---------- 目录更新 ---------- */
.page-about .about-updates__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: clamp(22px, 3.2vw, 40px);
  align-items: start;
}

.page-about .about-updates__cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .ucard {
  padding: 17px 16px;
  border: var(--hair);
  background: rgba(8, 36, 58, .55);
  clip-path: var(--clip-corner-sm);
  transition: transform .3s ease, background-color .3s ease;
}

.page-about .ucard:hover {
  transform: translateY(-3px);
  background: rgba(14, 58, 90, .68);
}

.page-about .ucard__num {
  display: block;
  font-size: clamp(18px, 1.8vw, 22px);
  font-weight: 600;
  color: var(--c-gold-300);
}

.page-about .ucard__title {
  margin: 8px 0 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.5;
  color: var(--c-paper);
}

.page-about .ucard__text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--c-mist);
}

.page-about .about-updates__grid .about-figure {
  margin-top: 0;
}

/* ---------- 合作与资质 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 40px);
}

.page-about .about-partners__label {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--c-neon-400);
}

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

.page-about .about-partners__list li {
  position: relative;
  padding: 11px 0 11px 20px;
  border-bottom: 1px solid rgba(14, 58, 90, .8);
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-mist);
}

.page-about .about-partners__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 19px;
  width: 8px;
  height: 8px;
  border: 1px solid var(--c-gold-500);
  transform: rotate(45deg);
}

.page-about .about-partners__list--mark li {
  color: var(--c-paper);
}

.page-about .about-partners__list--mark li .mono {
  display: inline-block;
  margin-right: 10px;
  font-size: 13px;
  color: var(--c-gold-300);
}

.page-about .about-cta {
  margin-top: clamp(32px, 4vw, 54px);
  padding: clamp(22px, 3vw, 34px);
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: clamp(18px, 2.6vw, 32px);
  align-items: center;
  background:
    radial-gradient(120% 130% at 100% 0%, rgba(55, 242, 214, .12), transparent 58%),
    linear-gradient(150deg, rgba(14, 58, 90, .8), rgba(4, 17, 31, .92));
  border: 1px solid rgba(215, 168, 74, .3);
  clip-path: var(--clip-corner);
}

.page-about .about-cta__text h3 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(19px, 2.2vw, 25px);
  line-height: 1.4;
  color: var(--c-paper);
}

.page-about .about-cta__text p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-mist);
}

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

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .page-about .about-hero__grid,
  .page-about .about-updates__grid {
    grid-template-columns: minmax(0, 1fr);
  }

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

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

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

@media (max-width: 960px) {
  .page-about .about-body {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-body__aside {
    position: static;
    top: auto;
  }

  .page-about .about-track {
    padding: 14px 16px;
    border: var(--hair);
    background: rgba(8, 36, 58, .5);
    clip-path: var(--clip-corner-sm);
  }

  .page-about .about-track__list {
    display: flex;
    flex-wrap: wrap;
    gap: 6px 4px;
  }

  .page-about .about-track__list li {
    border-left: 0;
  }

  .page-about .about-track__list a {
    border-left: 0;
    border-bottom: 2px solid transparent;
    padding: 7px 10px;
    margin-left: 0;
  }

  .page-about .about-track__list a[aria-current="true"] {
    border-left-color: transparent;
    border-bottom-color: var(--c-gold-500);
  }
}

@media (max-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .page-about .about-steps li::after {
    display: none;
  }

  .page-about .about-versions,
  .page-about .about-updates__cards,
  .page-about .about-partners {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-timeline__item {
    padding-left: 26px;
  }

  .page-about .about-cta {
    padding: 20px 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .ucard,
  .page-about .about-track__list a {
    transition: none;
  }

  .page-about .about-role:hover,
  .page-about .ucard:hover {
    transform: none;
  }
}