.page-about {
  --rail-w: 208px;
  --panel: rgba(42, 17, 71, 0.48);
  --panel-deep: rgba(20, 10, 36, 0.78);
  --panel-line: rgba(183, 155, 242, 0.16);
  color: var(--text-body);
  background: var(--night);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4vw, 48px) 0 clamp(36px, 6vw, 76px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% -20% auto -25%;
  height: 520px;
  background:
    radial-gradient(closest-side, rgba(108, 43, 217, 0.55), transparent 72%) 8% 40% / 640px 640px no-repeat,
    radial-gradient(closest-side, rgba(47, 208, 138, 0.18), transparent 72%) 82% 10% / 460px 460px no-repeat,
    radial-gradient(closest-side, rgba(233, 176, 76, 0.12), transparent 72%) 50% 100% / 380px 380px no-repeat;
  pointer-events: none;
}

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

.page-about .about-hero__kicker {
  display: inline-block;
  margin: 0 0 18px;
  padding: 5px 12px;
  font-size: var(--step-1);
  letter-spacing: 0.08em;
  color: var(--gold);
  border: 1px solid rgba(233, 176, 76, 0.35);
  border-radius: 999px;
  background: rgba(233, 176, 76, 0.07);
}

.page-about .about-hero h1 {
  margin: 0 0 22px;
  max-width: 18ch;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: var(--step-6);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: #ffffff;
}

.page-about .about-hero__lead {
  margin: 0 0 32px;
  max-width: 36em;
  font-size: var(--step-3);
  line-height: 1.85;
  color: var(--text-body);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 32px;
  padding: 0;
  list-style: none;
  border: 1px solid var(--panel-line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--panel-line);
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: var(--glass-2);
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  color: var(--green);
  letter-spacing: -0.01em;
}

.page-about .about-stats__label {
  font-size: var(--step-2);
  color: var(--text-dim);
}

.page-about .about-hero__actions,
.page-about .about-inline-actions,
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 主体栅格 ---------- */
.page-about .about-scroll {
  display: block;
  padding-bottom: clamp(40px, 7vw, 90px);
}

.page-about .about-rail {
  position: relative;
  margin-bottom: 26px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

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

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  min-width: max-content;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
}

.page-about .about-rail a {
  display: block;
  position: relative;
  padding: 8px 12px;
  font-size: var(--step-2);
  color: var(--text-dim);
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid var(--panel-line);
  border-radius: 999px;
  background: rgba(20, 10, 36, 0.5);
  transition: color 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}

.page-about .about-rail a:hover {
  color: var(--mist);
  border-color: rgba(183, 155, 242, 0.45);
}

.page-about .about-rail a[aria-current="true"] {
  color: var(--green-soft);
  border-color: rgba(47, 208, 138, 0.55);
  background: rgba(47, 208, 138, 0.1);
}

.page-about .about-flow > .about-stage {
  padding-block: clamp(34px, 6vw, 72px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-flow > .about-stage:first-child {
  padding-top: clamp(10px, 2vw, 22px);
  border-top: 0;
}

.page-about .about-stage__meta {
  margin: 0 0 12px;
  font-size: var(--step-1);
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .about-flow h2 {
  margin: 0 0 20px;
  max-width: 22ch;
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(26px, 3.4vw, var(--step-5));
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: #ffffff;
}

.page-about .about-flow p {
  margin: 0 0 18px;
  max-width: 40em;
  font-size: var(--step-3);
  line-height: 1.85;
  color: var(--text-body);
}

.page-about .about-quote {
  position: relative;
  margin: 26px 0 0;
  max-width: 20em;
  padding: 14px 18px;
  font-size: var(--step-3);
  line-height: 1.8;
  color: var(--mist);
  border-left: 2px solid var(--mist);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: linear-gradient(90deg, rgba(183, 155, 242, 0.1), transparent);
}

/* ---------- 十二类网格 ---------- */
.page-about .taxonomy {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 26px 0 8px;
}

.page-about .taxon {
  --tone: var(--grape);
  position: relative;
  padding: 14px 14px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-soft);
  border-top: 2px solid var(--tone);
  background: linear-gradient(160deg, rgba(42, 17, 71, 0.78), rgba(20, 10, 36, 0.88));
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.page-about .taxon:nth-child(3n + 1) { --tone: var(--grape); }
.page-about .taxon:nth-child(3n + 2) { --tone: var(--green); }
.page-about .taxon:nth-child(3n) { --tone: var(--gold); }
.page-about .taxon:nth-child(5n) { --tone: var(--mist); }

.page-about .taxon:hover,
.page-about .taxon:focus-within {
  transform: scale(1.02);
  border-color: var(--green);
  box-shadow: 0 0 0 1px rgba(47, 208, 138, 0.3), 0 14px 30px rgba(0, 0, 0, 0.4);
}

.page-about .taxon__name {
  margin: 0 0 6px;
  font-size: var(--step-3);
  font-weight: 700;
  color: #ffffff;
}

.page-about .taxon__desc {
  margin: 0;
  font-size: var(--step-1);
  line-height: 1.6;
  color: var(--text-dim);
}

/* ---------- 概述图片 ---------- */
.page-about .figure {
  margin: 28px 0;
}

.page-about .figure__media {
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--panel-line);
  background: var(--panel-deep);
}

.page-about .figure__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .figure__caption {
  margin-top: 10px;
  font-size: var(--step-1);
  color: var(--text-dim);
}

/* ---------- 版本阶段 ---------- */
.page-about .ledger {
  position: relative;
  margin: 26px 0 22px;
  padding: 0 0 0 20px;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .ledger::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, rgba(183, 155, 242, 0.45), rgba(47, 208, 138, 0.45), rgba(183, 155, 242, 0.1));
}

.page-about .ledger__item {
  position: relative;
  padding: 16px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-soft);
  background: rgba(20, 10, 36, 0.58);
  transition: border-color 0.25s ease, background 0.25s ease;
}

.page-about .ledger__item::before {
  content: "";
  position: absolute;
  left: -19px;
  top: 24px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--mist);
  box-shadow: 0 0 0 3px rgba(20, 10, 36, 1);
  transition: background 0.25s ease, box-shadow 0.25s ease;
}

.page-about .ledger__item:hover {
  border-color: rgba(47, 208, 138, 0.4);
  background: rgba(42, 17, 71, 0.62);
}

.page-about .ledger__item:hover::before {
  background: var(--green);
  box-shadow: 0 0 0 3px rgba(20, 10, 36, 1), 0 0 12px rgba(47, 208, 138, 0.7);
}

.page-about .ledger__tag {
  display: inline-block;
  margin-bottom: 8px;
  padding: 3px 9px;
  font-size: var(--step-1);
  color: var(--green-soft);
  border-radius: var(--radius-sm);
  background: rgba(47, 208, 138, 0.12);
}

.page-about .ledger__title {
  margin: 0 0 6px;
  font-size: var(--step-4);
  font-weight: 700;
  color: #ffffff;
}

.page-about .ledger__desc {
  margin: 0;
  font-size: var(--step-3);
  line-height: 1.75;
  color: var(--text-body);
}

/* ---------- 复核链路 ---------- */
.page-about .chain {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin: 26px 0 6px;
}

.page-about .chain__step {
  position: relative;
  padding: 16px 16px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-soft);
  background: linear-gradient(180deg, rgba(42, 17, 71, 0.6), rgba(20, 10, 36, 0.8));
}

.page-about .chain__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  margin-bottom: 10px;
  font-size: var(--step-1);
  color: var(--ink);
  background: var(--green-soft);
  border-radius: 50%;
}

.page-about .chain__name {
  margin: 0 0 6px;
  font-size: var(--step-3);
  font-weight: 700;
  color: #ffffff;
}

.page-about .chain__desc {
  margin: 0;
  font-size: var(--step-1);
  line-height: 1.7;
  color: var(--text-dim);
}

/* ---------- 团队同心圆 ---------- */
.page-about .team-map {
  display: grid;
  gap: 22px;
  align-items: center;
  margin: 26px 0 22px;
}

.page-about .ring-map {
  display: block;
  width: min(100%, 340px);
  height: auto;
  margin: 0 auto;
}

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

.page-about .team-legend__item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  font-size: var(--step-2);
  color: var(--text-body);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  background: rgba(20, 10, 36, 0.55);
}

.page-about .team-legend__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--mist);
  flex: none;
}

.page-about .team-legend__dot--green { background: var(--green); }
.page-about .team-legend__dot--gold { background: var(--gold); }

.page-about .team-legend__num {
  font-size: var(--step-3);
  font-weight: 700;
  color: #ffffff;
}

.page-about .team-legend__text {
  color: var(--text-dim);
}

/* ---------- 内蒙古区块 ---------- */
.page-about #region {
  position: relative;
}

.page-about #region::before {
  content: "";
  position: absolute;
  inset: 8% -12% 8% -12%;
  background: radial-gradient(closest-side, rgba(233, 176, 76, 0.12), transparent 70%);
  pointer-events: none;
}

.page-about #region > * {
  position: relative;
}

/* ---------- 底部行动 ---------- */
.page-about .about-cta {
  padding: 0 0 clamp(48px, 8vw, 96px);
}

.page-about .about-cta__panel {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 5vw, 52px);
  border-radius: var(--radius);
  border: 1px solid rgba(183, 155, 242, 0.24);
  background:
    radial-gradient(closest-side, rgba(47, 208, 138, 0.16), transparent 70%) 92% 12% / 380px 380px no-repeat,
    linear-gradient(140deg, rgba(108, 43, 217, 0.42), rgba(42, 17, 71, 0.86) 62%, rgba(20, 10, 36, 0.94));
}

.page-about .about-cta__title {
  margin: 0 0 14px;
  max-width: 22ch;
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(24px, 3vw, 38px);
  line-height: 1.24;
  color: #ffffff;
}

.page-about .about-cta__text {
  margin: 0 0 26px;
  max-width: 42em;
  font-size: var(--step-3);
  line-height: 1.85;
  color: var(--text-body);
}

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

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

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

@media (min-width: 820px) {
  .page-about .chain {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .team-map {
    grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
    gap: 34px;
  }
}

/* ---------- 桌面：左侧藤线索引 ---------- */
@media (min-width: 1000px) {
  .page-about .about-scroll {
    display: grid;
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 76px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 104px;
    margin-bottom: 0;
    padding-left: 22px;
    overflow: visible;
  }

  .page-about .about-rail::before {
    content: "";
    position: absolute;
    left: 5px;
    top: 10px;
    bottom: 10px;
    width: 1px;
    background: linear-gradient(180deg, rgba(183, 155, 242, 0.5), rgba(47, 208, 138, 0.5), rgba(183, 155, 242, 0.06));
  }

  .page-about .about-rail__list {
    display: block;
    min-width: 0;
    padding: 0;
  }

  .page-about .about-rail li + li {
    margin-top: 4px;
  }

  .page-about .about-rail a {
    padding: 8px 10px;
    border-color: transparent;
    border-radius: var(--radius-sm);
    background: transparent;
    transition: color 0.25s ease, background 0.25s ease, transform 0.25s ease;
  }

  .page-about .about-rail a::before {
    content: "";
    position: absolute;
    left: -21px;
    top: 50%;
    width: 9px;
    height: 9px;
    margin-top: -4.5px;
    border-radius: 50%;
    background: var(--night);
    border: 1px solid rgba(183, 155, 242, 0.6);
    transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
  }

  .page-about .about-rail a:hover {
    border-color: transparent;
    background: rgba(183, 155, 242, 0.08);
  }

  .page-about .about-rail a[aria-current="true"] {
    color: var(--green-soft);
    border-color: transparent;
    background: rgba(47, 208, 138, 0.1);
    transform: translateX(-4px);
  }

  .page-about .about-rail a[aria-current="true"]::before {
    background: var(--green);
    border-color: var(--green);
    box-shadow: 0 0 12px rgba(47, 208, 138, 0.8);
  }

  .page-about .taxonomy {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-flow .figure--wide {
    margin-left: -2%;
    margin-right: -2%;
    max-width: 104%;
  }
}

@media (min-width: 1180px) {
  .page-about .about-flow p {
    font-size: 18px;
  }
}

/* ---------- 减少动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .taxon,
  .page-about .about-rail a,
  .page-about .ledger__item {
    transition: none;
  }

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

  .page-about .about-rail a[aria-current="true"] {
    transform: none;
  }
}