.page-about {
  --about-cyan-soft: rgba(34, 224, 255, 0.14);
  --about-violet-soft: rgba(165, 91, 255, 0.14);
  --about-amber-soft: rgba(255, 176, 32, 0.12);
  background: var(--ink);
  color: var(--text);
}

.page-about .crumbs a {
  color: var(--muted);
  text-decoration: none;
  transition: color 180ms var(--ease);
}

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

/* ---------- 首屏主张海报 ---------- */
.page-about .page-about__hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(24px, 4vw, 48px) 0 clamp(36px, 7vw, 88px);
}

.page-about .page-about__hero::before {
  content: "";
  position: absolute;
  inset: 0 -12% auto -12%;
  height: 420px;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(closest-side at 22% 34%, var(--about-cyan-soft), transparent 72%),
    radial-gradient(closest-side at 80% 6%, var(--about-violet-soft), transparent 70%);
}

.page-about .page-about__hero::after {
  content: "";
  position: absolute;
  right: -40px;
  top: clamp(70px, 14vw, 150px);
  width: clamp(140px, 24vw, 300px);
  height: clamp(140px, 24vw, 300px);
  z-index: -1;
  pointer-events: none;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: radial-gradient(circle at 32% 32%, var(--about-violet-soft), transparent 70%);
}

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

.page-about .page-about__title {
  margin: clamp(10px, 2vw, 20px) 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 8.2vw, 110px);
  line-height: 0.96;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .page-about__accent {
  position: relative;
  color: var(--cyan);
}

.page-about .page-about__accent::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.08em;
  height: 0.1em;
  background: linear-gradient(90deg, var(--cyan), var(--violet));
  opacity: 0.6;
  border-radius: 2px;
}

.page-about .page-about__hero-foot {
  margin-top: clamp(26px, 5vw, 56px);
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .page-about__lede {
  margin: 0;
  max-width: 42ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .page-about__stats {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(16px, 4vw, 40px);
  margin: 0;
  padding: clamp(16px, 3vw, 22px) 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .page-about__stat {
  min-width: 96px;
}

.page-about .page-about__stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.8vw, 30px);
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .page-about__stat-label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

@media (min-width: 900px) {
  .page-about .page-about__hero-foot {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    align-items: end;
  }
}

@media (min-width: 1000px) {
  .page-about .page-about__note {
    display: block;
    position: absolute;
    right: 8px;
    top: 8px;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.34em;
    color: var(--muted);
  }
}

/* ---------- 轨道 + 内容流 ---------- */
.page-about .page-about__body {
  display: grid;
  gap: clamp(28px, 5vw, 60px);
  padding-bottom: clamp(56px, 10vw, 120px);
}

.page-about .page-about__rail-title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--muted);
}

.page-about .page-about__rail-list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 20px;
  margin: 10px 0 0;
  padding: 0 0 0 14px;
  list-style: none;
  border-left: 1px solid var(--line);
}

.page-about .page-about__rail-link {
  display: block;
  padding: 5px 0;
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--muted);
  text-decoration: none;
  transition: color 200ms var(--ease);
}

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

.page-about .page-about__rail-link[aria-current] {
  color: var(--cyan);
}

@media (min-width: 1000px) {
  .page-about .page-about__body {
    grid-template-columns: 186px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .page-about__rail {
    position: sticky;
    top: 108px;
  }

  .page-about .page-about__rail-list {
    flex-direction: column;
    gap: 0;
  }

  .page-about .page-about__rail-link {
    position: relative;
  }

  .page-about .page-about__rail-link[aria-current]::before {
    content: "";
    position: absolute;
    left: -16px;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 16px;
    border-radius: 2px;
    background: var(--cyan);
  }
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  scroll-margin-top: 120px;
}

.page-about .about-section + .about-section {
  margin-top: clamp(56px, 9vw, 110px);
}

.page-about .about-section__num {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--violet);
}

.page-about .about-section__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 4.2vw, 46px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-section__intro {
  margin: 14px 0 0;
  max-width: 48ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline__figure {
  margin: clamp(24px, 4vw, 40px) 0 clamp(30px, 5vw, 52px);
}

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

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--line) 45%, var(--line));
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 clamp(22px, 3.4vw, 36px) 34px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(34, 224, 255, 0.12), 0 0 16px rgba(34, 224, 255, 0.5);
  transition: box-shadow 220ms var(--ease), border-color 220ms var(--ease);
}

.page-about .timeline__item:hover::before {
  border-color: var(--mint);
  box-shadow: 0 0 0 6px rgba(44, 230, 168, 0.14), 0 0 20px rgba(44, 230, 168, 0.55);
}

.page-about .timeline__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: clamp(17px, 2.2vw, 24px);
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--cyan);
}

.page-about .timeline__title {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.4;
  color: var(--text);
}

.page-about .timeline__text {
  margin: 8px 0 0;
  max-width: 56ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

@media (min-width: 820px) {
  .page-about .timeline__item {
    display: grid;
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 4px 26px;
  }

  .page-about .timeline__year {
    text-align: left;
  }

  .page-about .timeline__title {
    margin-top: 0;
  }
}

/* ---------- 价值主张 ---------- */
.page-about .values__head {
  display: grid;
  gap: clamp(20px, 4vw, 36px);
  align-items: end;
}

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

.page-about .values__visual .figure__media {
  aspect-ratio: 1 / 1;
}

.page-about .values {
  display: grid;
  gap: 14px;
  margin-top: clamp(26px, 4.5vw, 46px);
}

.page-about .value {
  padding: clamp(20px, 3vw, 30px);
  border-radius: var(--radius);
  background: var(--panel);
  border-left: 2px solid var(--line);
  transition: background 220ms var(--ease), transform 220ms var(--ease);
}

.page-about .value:hover {
  background: var(--raise);
  transform: translateY(-3px);
}

.page-about .value--cyan {
  border-left-color: var(--cyan);
}

.page-about .value--violet {
  border-left-color: var(--violet);
}

.page-about .value--amber {
  border-left-color: var(--amber);
}

.page-about .value__title {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(20px, 2.5vw, 25px);
  line-height: 1.2;
  color: var(--text);
}

.page-about .value__label {
  display: inline-block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--muted);
}

.page-about .value__text {
  margin: 6px 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

@media (min-width: 860px) {
  .page-about .values__head {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
  }

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

  .page-about .value:nth-child(2) {
    margin-top: 40px;
  }

  .page-about .value:nth-child(3) {
    margin-top: 82px;
  }
}

/* ---------- 团队 ---------- */
.page-about .team {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .team__list {
  display: grid;
  gap: 0;
}

.page-about .team__item {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.page-about .team__item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .team__role {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .team__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

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

.page-about .team__visual .figure__media {
  aspect-ratio: 4 / 3;
}

@media (min-width: 640px) {
  .page-about .team__item {
    grid-template-columns: 116px minmax(0, 1fr);
    gap: 6px 22px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .team {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
  }
}

/* ---------- 运营原则 ---------- */
.page-about .governance {
  display: grid;
  gap: clamp(14px, 2.6vw, 20px);
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .governance__item {
  padding: clamp(18px, 3vw, 26px);
  border-radius: var(--radius);
  background: var(--panel);
  transition: background 220ms var(--ease);
}

.page-about .governance__item:hover {
  background: var(--raise);
}

.page-about .governance__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(16px, 1.9vw, 18px);
  line-height: 1.45;
  color: var(--text);
}

.page-about .governance__text {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

@media (min-width: 800px) {
  .page-about .governance {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  margin-top: clamp(56px, 9vw, 110px);
  padding: clamp(26px, 5vw, 48px);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background:
    radial-gradient(closest-side at 12% 0%, var(--about-cyan-soft), transparent 72%),
    radial-gradient(closest-side at 92% 100%, var(--about-violet-soft), transparent 72%),
    var(--panel);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.6vw, 36px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-cta__text {
  margin: 12px 0 0;
  max-width: 48ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

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

.page-about .about-cta__link a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 224, 255, 0.4);
  transition: border-color 180ms var(--ease);
}

.page-about .about-cta__link a:hover,
.page-about .about-cta__link a:focus-visible {
  border-bottom-color: var(--cyan);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .value,
  .page-about .governance__item,
  .page-about .timeline__item::before,
  .page-about .page-about__rail-link {
    transition: none;
  }

  .page-about .value:hover {
    transform: none;
  }
}