.page-about {
  --about-axis-line: 1px solid var(--orbit);
  --about-ink-soft: rgba(11, 14, 19, .68);
  --about-ink-line: rgba(11, 14, 19, .14);
  display: block;
  background: var(--ink-blue);
  color: var(--paper);
  font-family: var(--font-sans);
  overflow-x: clip;
}

.page-about .crumb {
  padding-top: 26px;
  padding-bottom: 6px;
}

.page-about .crumb__item {
  color: var(--mist);
  font-size: var(--step-xs);
  letter-spacing: .16em;
}

.page-about .crumb__link {
  color: var(--mist);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-about .crumb__link:hover,
.page-about .crumb__link:focus-visible {
  color: var(--cyan);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero-stage {
  padding-bottom: clamp(52px, 8vw, 118px);
}

.page-about .about-hero-stage .eyebrow {
  margin-top: clamp(26px, 5vw, 56px);
}

.page-about .about-h1 {
  margin: 20px 0 0;
  max-width: 15ch;
  font-size: clamp(40px, 8.6vw, 104px);
  line-height: 1.02;
  letter-spacing: -.02em;
  font-weight: 900;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(30px, 5vw, 60px);
  margin-top: clamp(34px, 5vw, 68px);
}

.page-about .about-hero__lead .lede {
  max-width: 46ch;
  color: var(--paper);
}

.page-about .about-hero__sub {
  margin-top: 18px;
  max-width: 48ch;
  font-size: var(--step-sm);
  color: var(--mist);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--orbit);
  border: 1px solid var(--orbit);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-hero__stats li {
  background: var(--deep-blue);
  padding: 18px 14px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 0;
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .about-stat__unit {
  font-size: .5em;
  margin-left: 2px;
}

.page-about .about-stat__label {
  font-size: var(--step-xs);
  letter-spacing: .1em;
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 中轴年表 ---------- */

.page-about .about-axis {
  background: linear-gradient(180deg, var(--ink-blue) 0%, var(--deep-blue) 100%);
  border-top: var(--about-axis-line);
  border-bottom: var(--about-axis-line);
}

.page-about .about-axis__lede {
  margin-top: 16px;
  max-width: 46ch;
  color: var(--mist);
}

.page-about .axis {
  list-style: none;
  margin: clamp(38px, 6vw, 78px) 0 0;
  padding: 0 0 0 42px;
  position: relative;
  display: grid;
  gap: clamp(34px, 5.5vw, 72px);
}

.page-about .axis::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--orbit);
}

.page-about .axis__item {
  position: relative;
  min-width: 0;
}

.page-about .axis__dot {
  position: absolute;
  left: -42px;
  top: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--deep-blue);
  border: 1px solid var(--orbit);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 10px;
  letter-spacing: 0;
  color: var(--mist);
}

.page-about .axis__title {
  margin: 0 0 10px;
  font-size: var(--step-lg);
  line-height: 1.4;
  font-weight: 700;
  color: var(--paper);
}

.page-about .axis__body p {
  margin: 0;
  max-width: 42ch;
  font-size: var(--step-md);
  line-height: 1.75;
  color: var(--mist);
}

.page-about .axis__item--now .axis__dot {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-blue);
  box-shadow: 0 0 0 7px rgba(53, 242, 214, .12);
  animation: about-pulse 2.4s ease-in-out infinite;
}

.page-about .axis__item--now .axis__title {
  color: var(--cyan);
}

@keyframes about-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: .82; }
}

/* ---------- 团队 ---------- */

.page-about .stage--paper .about-team,
.page-about .stage--paper {
  color: var(--ink);
}

.page-about .about-team__lede {
  margin-top: 16px;
  max-width: 48ch;
  color: var(--about-ink-soft);
}

.page-about .about-team__filter {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(26px, 4vw, 44px) 0 clamp(28px, 4vw, 46px);
}

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

.page-about .filter-chip {
  appearance: none;
  border: 1px solid var(--about-ink-line);
  background: transparent;
  color: var(--about-ink-soft);
  font-family: var(--font-sans);
  font-size: var(--step-sm);
  letter-spacing: .06em;
  padding: 8px 18px;
  border-radius: 999px;
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .filter-chip:hover {
  border-color: var(--cyan-ink);
  color: var(--ink);
}

.page-about .filter-chip:focus-visible {
  outline: 2px solid var(--cyan-ink);
  outline-offset: 2px;
}

.page-about .filter-chip.is-active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
  font-weight: 600;
}

.page-about .about-team__layout {
  display: grid;
  gap: clamp(30px, 5vw, 56px);
}

.page-about .team-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-ink-line);
  border: 1px solid var(--about-ink-line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .team-card {
  background: var(--paper);
  padding: 22px 20px 26px;
  border-top: 2px solid var(--orbit);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .team-card:nth-child(1) { border-top-color: var(--cyan-ink); }
.page-about .team-card:nth-child(2) { border-top-color: var(--amber); }
.page-about .team-card:nth-child(3) { border-top-color: var(--violet); }
.page-about .team-card:nth-child(4) { border-top-color: var(--orbit); }

.page-about .team-card.is-filtered-out {
  display: none;
}

.page-about .team-card__no {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(28px, 4vw, 38px);
  line-height: 1;
  font-weight: 700;
  color: var(--ink);
}

.page-about .team-card__unit {
  font-size: .46em;
  margin-left: 4px;
  letter-spacing: .08em;
  color: var(--about-ink-soft);
}

.page-about .team-card__name {
  margin: 0 0 10px;
  font-size: var(--step-lg);
  line-height: 1.35;
  font-weight: 700;
  color: var(--ink);
}

.page-about .team-card__desc {
  margin: 0;
  font-size: var(--step-sm);
  line-height: 1.78;
  color: var(--about-ink-soft);
}

.page-about .about-team__figure {
  margin: 0;
}

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

.page-about .media-frame__note {
  margin-top: 12px;
  font-size: var(--step-xs);
  letter-spacing: .06em;
  line-height: 1.7;
  color: var(--about-ink-soft);
}

/* ---------- 流程 ---------- */

.page-about .about-flow__lede {
  margin-top: 16px;
  max-width: 48ch;
  color: var(--mist);
}

.page-about .flow {
  list-style: none;
  margin: clamp(34px, 5vw, 62px) 0 0;
  padding: 0;
  border-top: 1px solid var(--orbit);
}

.page-about .flow__step {
  display: grid;
  gap: 14px;
  padding: clamp(22px, 3.2vw, 34px) 0;
  border-bottom: 1px solid var(--orbit);
}

.page-about .flow__no {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--step-xl);
  line-height: 1;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .flow__title {
  margin: 0 0 10px;
  font-size: var(--step-lg);
  line-height: 1.35;
  font-weight: 700;
  color: var(--paper);
}

.page-about .flow__body p {
  margin: 0 0 12px;
  max-width: 52ch;
  font-size: var(--step-md);
  line-height: 1.75;
  color: var(--mist);
}

.page-about .flow__out {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  font-size: var(--step-sm);
  color: var(--paper);
}

.page-about .flow__key {
  font-size: var(--step-xs);
  letter-spacing: .16em;
  color: var(--amber);
}

.page-about .about-flow__more,
.page-about .about-glossary__more,
.page-about .about-credits__more {
  margin-top: clamp(24px, 3.4vw, 38px);
  font-size: var(--step-md);
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-glossary__more,
.page-about .about-credits__more {
  color: var(--about-ink-soft);
}

.page-about .about-inline-link {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
  transition: color var(--dur) var(--ease);
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--amber);
}

/* ---------- 覆盖范围 ---------- */

.page-about .about-cover__lede {
  margin-top: 16px;
  max-width: 48ch;
  color: var(--about-ink-soft);
}

.page-about .cover-layout {
  display: grid;
  gap: clamp(30px, 5vw, 64px);
  margin-top: clamp(30px, 4.6vw, 56px);
}

.page-about .cover-list {
  margin: 0;
  display: grid;
  gap: 0;
}

.page-about .cover-list > div {
  display: grid;
  gap: 8px;
  padding: 20px 0;
  border-bottom: 1px solid var(--about-ink-line);
}

.page-about .cover-list > div:first-child {
  padding-top: 0;
}

.page-about .cover-list dt {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1.1;
  font-weight: 700;
  color: var(--ink);
}

.page-about .cover-list dd {
  margin: 0;
  font-size: var(--step-sm);
  line-height: 1.78;
  color: var(--about-ink-soft);
  max-width: 44ch;
}

.page-about .about-cover__figure {
  margin: 0;
}

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

/* ---------- 术语与校对 ---------- */

.page-about .about-glossary {
  background: var(--ink-blue);
}

.page-about .about-glossary__lede {
  margin-top: 16px;
  max-width: 52ch;
  color: var(--mist);
}

.page-about .glossary-grid {
  display: grid;
  gap: 1px;
  margin-top: clamp(32px, 4.6vw, 58px);
  background: var(--orbit);
  border: 1px solid var(--orbit);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .glossary-item {
  background: var(--deep-blue);
  padding: 22px 20px 26px;
}

.page-about .glossary-item__key {
  margin: 0 0 12px;
  font-size: var(--step-xs);
  letter-spacing: .16em;
  color: var(--amber);
}

.page-about .glossary-item__text {
  margin: 0;
  font-size: var(--step-sm);
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 合作与荣誉 ---------- */

.page-about .credits-list {
  list-style: none;
  margin: clamp(30px, 4.4vw, 52px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-ink-line);
  border: 1px solid var(--about-ink-line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .credits-item {
  background: var(--paper);
  display: grid;
  gap: 12px;
  padding: 24px 20px 28px;
  align-items: start;
}

.page-about .credits-item .tag {
  justify-self: start;
  border-radius: 999px;
  padding: 4px 12px;
  font-size: var(--step-xs);
  letter-spacing: .14em;
  border: 1px solid currentColor;
  background: transparent;
}

.page-about .credits-item .tag--cyan { color: var(--cyan-ink); }
.page-about .credits-item .tag--amber { color: #B85714; }
.page-about .credits-item .tag--violet { color: #5B4BC4; }

.page-about .credits-item__text {
  margin: 0;
  font-size: var(--step-md);
  line-height: 1.78;
  color: var(--about-ink-soft);
}

/* ---------- 合规与收束 ---------- */

.page-about .about-close {
  background:
    radial-gradient(120% 90% at 50% 0%, rgba(53, 242, 214, .1) 0%, rgba(53, 242, 214, 0) 62%),
    var(--ink-blue);
  border-top: var(--about-axis-line);
}

.page-about .about-close__box {
  max-width: 62ch;
}

.page-about .about-close__text {
  margin: 18px 0 0;
  font-size: var(--step-md);
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: clamp(28px, 4vw, 44px);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .team-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .credits-item {
    grid-template-columns: 96px 1fr;
    align-items: center;
    gap: 20px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    align-items: end;
  }

  .page-about .about-hero__lead {
    grid-column: 1 / span 7;
  }

  .page-about .about-hero__stats {
    grid-column: 9 / span 4;
  }

  .page-about .axis {
    padding-left: 0;
    gap: clamp(52px, 6.5vw, 96px);
  }

  .page-about .axis::before {
    left: 50%;
  }

  .page-about .axis__item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: clamp(40px, 6vw, 96px);
  }

  .page-about .axis__dot {
    left: 50%;
    transform: translateX(-50%);
    width: 32px;
    height: 32px;
    font-size: 11px;
  }

  .page-about .axis__item:nth-child(odd) .axis__body {
    grid-column: 1;
    text-align: right;
    padding-right: clamp(24px, 3.4vw, 52px);
  }

  .page-about .axis__item:nth-child(odd) .axis__body p {
    margin-left: auto;
  }

  .page-about .axis__item:nth-child(even) .axis__body {
    grid-column: 2;
    padding-left: clamp(24px, 3.4vw, 52px);
  }

  .page-about .flow__step {
    grid-template-columns: 96px 1fr;
    gap: clamp(24px, 4vw, 56px);
    align-items: start;
  }

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

@media (min-width: 1040px) {
  .page-about .about-team__layout {
    grid-template-columns: 1.08fr .92fr;
    align-items: start;
  }

  .page-about .cover-layout {
    grid-template-columns: 1.12fr .88fr;
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .axis__item--now .axis__dot {
    animation: none;
  }
}
</main>