.page-about {
  --about-block-gap: clamp(56px, 8vw, 112px);
  --about-card-radius: 8px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(18px, 3vw, 36px);
}

.page-about .about-hero__frame {
  position: relative;
  margin-top: clamp(18px, 3vw, 34px);
  padding: clamp(30px, 5vw, 76px) clamp(22px, 4vw, 68px);
  border: 1px solid var(--yz-line);
  border-radius: var(--yz-radius-lg);
  background:
    radial-gradient(120% 140% at 8% 0%, rgba(232, 176, 75, 0.10), transparent 58%),
    linear-gradient(158deg, #12294a 0%, #0b1b33 78%);
  overflow: hidden;
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(31, 58, 95, 0.55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(31, 58, 95, 0.55) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.32;
  pointer-events: none;
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  inset: clamp(10px, 1.4vw, 18px);
  border: 1px dashed rgba(31, 58, 95, 0.65);
  border-radius: calc(var(--yz-radius-lg) - 10px);
  pointer-events: none;
}

.page-about .about-hero__frame > * {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__title {
  font-family: var(--yz-serif);
  font-weight: 900;
  font-size: clamp(30px, 5.2vw, 60px);
  line-height: 1.16;
  letter-spacing: 0.01em;
  color: var(--yz-moon);
  margin: 0.22em 0 0.42em;
  max-width: 17ch;
}

.page-about .about-hero__lede {
  max-width: 60ch;
  margin: 0;
  color: rgba(242, 245, 249, 0.82);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(26px, 3.4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--yz-line);
  border: 1px solid var(--yz-line);
  border-radius: 14px;
  overflow: hidden;
}

.page-about .about-hero__stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: rgba(11, 27, 51, 0.74);
}

.page-about .about-hero__stat-num {
  font-size: clamp(20px, 2.6vw, 26px);
  color: var(--yz-gold);
  letter-spacing: 0.04em;
}

.page-about .about-hero__stat-label {
  font-size: 13px;
  color: var(--yz-mist);
  letter-spacing: 0.06em;
}

.page-about .about-hero__figure {
  margin: clamp(20px, 3vw, 34px) 0 0;
  overflow: hidden;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 8 / 3;
  object-fit: cover;
}

/* 通用图与描述 */
.page-about .yz-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .yz-figure__caption {
  font-size: 13px;
  color: var(--yz-mist);
}

/* ---------- 主体双栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  padding-bottom: clamp(48px, 7vw, 104px);
}

.page-about .about-index {
  border-top: 1px solid var(--yz-line);
  padding-top: 18px;
}

.page-about .about-index__label {
  margin: 0 0 12px;
  font-family: var(--yz-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--yz-mist);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-index__list a {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--yz-mist);
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 10px;
  transition: color var(--yz-wave) ease, background-color var(--yz-wave) ease, border-color var(--yz-wave) ease;
}

.page-about .about-index__list a span {
  font-size: 11px;
  color: var(--yz-gold);
  opacity: 0.75;
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--yz-glow);
  background: rgba(232, 176, 75, 0.09);
  border-color: rgba(232, 176, 75, 0.45);
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding-block: clamp(34px, 4.6vw, 62px);
  border-top: 1px solid var(--yz-line);
}

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

.page-about .about-section > .yz-section-title {
  margin: 0.3em 0 0.7em;
  max-width: 24ch;
}

.page-about .about-note {
  margin-top: clamp(18px, 2.6vw, 30px);
}

/* ---------- 团队概览 ---------- */
.page-about .about-overview__figure {
  margin: clamp(22px, 3vw, 34px) 0 0;
  overflow: hidden;
}

.page-about .about-squads {
  list-style: none;
  margin: clamp(22px, 3vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 230px), 1fr));
  gap: 16px;
}

.page-about .squad {
  position: relative;
  padding: 22px clamp(18px, 2vw, 24px) 24px;
  background: var(--yz-panel);
  border: 1px solid var(--yz-line);
  border-top: 3px solid var(--squad-accent, var(--yz-gold));
  border-radius: var(--about-card-radius) var(--about-card-radius) 16px 16px;
  transition: transform var(--yz-wave) ease, border-color var(--yz-wave) ease, box-shadow var(--yz-wave) ease;
}

.page-about .squad:hover,
.page-about .squad:focus-within {
  transform: translateY(-3px);
  border-color: rgba(232, 176, 75, 0.5);
  border-top-color: var(--squad-accent, var(--yz-gold));
  box-shadow: 0 0 0 1px rgba(232, 176, 75, 0.18), 0 20px 38px -26px rgba(0, 0, 0, 0.85);
}

.page-about .squad--jade { --squad-accent: var(--yz-jade); }
.page-about .squad--gold { --squad-accent: var(--yz-gold); }
.page-about .squad--amber { --squad-accent: var(--yz-amber); }
.page-about .squad--cinnabar { --squad-accent: var(--yz-cinnabar); }

.page-about .squad__no {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--squad-accent, var(--yz-gold));
}

.page-about .squad__name {
  margin: 0 0 6px;
  font-family: var(--yz-serif);
  font-weight: 700;
  font-size: 20px;
  color: var(--yz-moon);
}

.page-about .squad__size {
  margin: 0 0 12px;
  font-size: 13px;
  color: var(--yz-mist);
}

.page-about .squad__size span {
  color: var(--yz-glow);
}

.page-about .squad__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--yz-mist);
}

/* ---------- 步骤清单 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: clamp(20px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--yz-line);
  border: 1px solid var(--yz-line);
  border-radius: 14px;
  overflow: hidden;
}

.page-about .about-steps li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: 18px clamp(16px, 2.4vw, 26px);
  background: rgba(18, 41, 74, 0.6);
}

.page-about .about-steps__n {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--yz-gold);
  padding-top: 4px;
}

.page-about .about-steps p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.76;
  color: rgba(242, 245, 249, 0.84);
}

/* ---------- 主题簇 ---------- */
.page-about .about-clusters {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr));
}

.page-about .about-clusters__item {
  padding-left: 16px;
  border-left: 1px solid var(--yz-line);
}

.page-about .about-clusters__item p {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--yz-mist);
}

/* ---------- 技术规格 ---------- */
.page-about .about-specs {
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--yz-line);
  border: 1px solid var(--yz-line);
  border-radius: 14px;
  overflow: hidden;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 200px), 1fr));
}

.page-about .about-specs__item {
  padding: 20px clamp(16px, 2.2vw, 24px);
  background: rgba(11, 27, 51, 0.68);
}

.page-about .about-specs dt {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--yz-mist);
  margin-bottom: 10px;
}

.page-about .about-specs dd {
  margin: 0;
  font-size: 15px;
  color: var(--yz-moon);
}

.page-about .about-specs dd span {
  color: var(--yz-gold);
  font-size: 21px;
  margin-right: 6px;
}

/* ---------- 协作与标准 ---------- */
.page-about .about-collab {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  margin-top: clamp(20px, 3vw, 34px);
}

.page-about .about-collab__sub {
  margin: 0 0 16px;
  font-family: var(--yz-serif);
  font-weight: 700;
  font-size: 18px;
  color: var(--yz-moon);
}

.page-about .about-standard {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-standard li {
  position: relative;
  padding-left: 24px;
  font-size: 15.5px;
  line-height: 1.76;
  color: rgba(242, 245, 249, 0.84);
}

.page-about .about-standard li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0.62em;
  width: 8px;
  height: 8px;
  border-radius: 3px;
  background: var(--yz-gold);
}

.page-about .about-map {
  padding: clamp(20px, 3vw, 30px);
  background: var(--yz-panel);
  border: 1px solid var(--yz-line);
  border-radius: var(--yz-radius);
}

.page-about .about-map__svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-map__link {
  fill: none;
  stroke: var(--yz-line);
  stroke-width: 1.5;
  stroke-dasharray: 4 5;
}

.page-about .about-map__hub-ring {
  fill: none;
  stroke: var(--yz-gold);
  stroke-width: 1;
  opacity: 0.45;
}

.page-about .about-map__hub {
  fill: var(--yz-gold);
}

.page-about .about-map__node {
  stroke: rgba(11, 27, 51, 0.9);
  stroke-width: 2;
}

.page-about .about-map__node--jade { fill: var(--yz-jade); }
.page-about .about-map__node--gold { fill: var(--yz-gold); }
.page-about .about-map__node--amber { fill: var(--yz-amber); }
.page-about .about-map__node--cinnabar { fill: var(--yz-cinnabar); }

.page-about .about-map__label {
  fill: var(--yz-mist);
  font-family: var(--yz-sans);
  font-size: 11px;
  letter-spacing: 0.05em;
}

.page-about .about-map__label--hub {
  fill: var(--yz-gold);
}

.page-about .about-map__caption {
  margin: 18px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--yz-mist);
}

/* ---------- 客服信息 ---------- */
.page-about .about-contact {
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--yz-line);
  border: 1px solid var(--yz-line);
  border-radius: 14px;
  overflow: hidden;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 200px), 1fr));
}

.page-about .about-contact__item {
  padding: 20px clamp(16px, 2.2vw, 24px);
  background: rgba(18, 41, 74, 0.6);
}

.page-about .about-contact dt {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--yz-mist);
  margin-bottom: 10px;
}

.page-about .about-contact dd {
  margin: 0;
  font-family: var(--yz-mono);
  font-size: 14.5px;
  word-break: break-word;
  color: var(--yz-glow);
}

/* ---------- 时间轴 ---------- */
.page-about .about-history__figure {
  margin: clamp(22px, 3vw, 34px) 0 0;
  overflow: hidden;
}

.page-about .about-timeline {
  list-style: none;
  margin: clamp(26px, 3.6vw, 44px) 0 0;
  padding: 0;
  display: grid;
  gap: 28px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: -28px;
  width: 1px;
  background: var(--yz-line);
}

.page-about .about-timeline__item:last-child::before {
  display: none;
}

.page-about .about-timeline__dot {
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--yz-ink);
  border: 1.5px solid var(--yz-line);
  transition: background-color var(--yz-wave) ease, border-color var(--yz-wave) ease, box-shadow var(--yz-wave) ease;
}

.page-about .about-timeline__item.is-revealed .about-timeline__dot {
  background: var(--yz-gold);
  border-color: var(--yz-glow);
  box-shadow: 0 0 0 4px rgba(232, 176, 75, 0.16), 0 0 18px rgba(232, 176, 75, 0.5);
}

.page-about .about-timeline__when {
  margin: 0 0 8px;
  font-family: var(--yz-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--yz-gold);
}

.page-about .about-timeline__title {
  margin: 0 0 6px;
  font-family: var(--yz-serif);
  font-weight: 700;
  font-size: 17px;
  color: var(--yz-moon);
}

.page-about .about-timeline__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--yz-mist);
  max-width: 32ch;
}

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

@media (min-width: 1000px) {
  .page-about .about-timeline {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    column-gap: 0;
    row-gap: 0;
  }

  .page-about .about-timeline__item {
    padding: 36px 22px 0 0;
  }

  .page-about .about-timeline__item::before {
    left: 0;
    right: 0;
    top: 17px;
    bottom: auto;
    width: auto;
    height: 1px;
  }

  .page-about .about-timeline__item:last-child::before {
    display: block;
  }

  .page-about .about-timeline__dot {
    left: 0;
    top: 12px;
  }

  .page-about .about-collab {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-about .about-body {
    grid-template-columns: 200px minmax(0, 1fr);
    column-gap: clamp(44px, 5vw, 80px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--yz-header-h) + 28px);
  }

  .page-about .about-index__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }

  .page-about .about-index__list a {
    padding: 9px 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .squad,
  .page-about .about-timeline__dot,
  .page-about .about-index__list a {
    transition: none;
  }

  .page-about .squad:hover,
  .page-about .squad:focus-within {
    transform: none;
  }
}