.page-about {
  background: var(--mg-gray);
  color: var(--mg-ink);
  font-family: var(--font-cn);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  background: var(--grad-paper);
  border-bottom: 1px solid var(--mg-line);
  padding: clamp(24px, 4vw, 40px) 0 clamp(40px, 6vw, 80px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  margin-top: clamp(20px, 3vw, 36px);
}

.page-about .about-hero__lead h1 {
  font-size: clamp(32px, 6vw, 72px);
  line-height: 1.15;
  letter-spacing: 0.02em;
  font-weight: 600;
  margin: 0 0 clamp(16px, 2vw, 24px);
  max-width: 20ch;
}

.page-about .about-hero__lead .lede {
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.7;
  color: var(--ink-80);
  max-width: 60ch;
  margin: 0 0 clamp(18px, 2.4vw, 28px);
}

.page-about .about-hero__aside {
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-64);
  max-width: 58ch;
  padding-left: 16px;
  border-left: 3px solid var(--mg-orange);
}

.page-about .about-hero__aside .link-arrow {
  margin-left: 6px;
}

.page-about .about-hero__chain {
  align-self: end;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--mg-paper);
  border: 1px solid var(--mg-line);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-soft);
}

.page-about .chain-node {
  font-family: var(--font-en);
  font-size: 14px;
  letter-spacing: 0.06em;
  padding: 9px 15px;
  border: 1px solid var(--mg-line);
  border-radius: var(--r-sm);
  background: var(--mg-gray);
  color: var(--ink-80);
}

.page-about .chain-node--now {
  background: var(--grad-cool);
  border-color: transparent;
  color: #FFFFFF;
  font-weight: 600;
}

.page-about .chain-arrow {
  color: var(--ink-42);
  font-size: 14px;
}

.page-about .chain-note {
  flex: 1 1 100%;
  margin: 6px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--mg-line);
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-64);
}

/* ---------- 时间轴骨架 ---------- */
.page-about .about-roadmap {
  padding-block: clamp(40px, 6vw, 96px);
}

.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: clamp(26px, 3.4vw, 44px);
}

.page-about .tl-row {
  display: grid;
  gap: 16px;
}

.page-about .tl-mark {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 12px;
}

.page-about .tl-stage {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--mg-blue-dark);
  background: var(--mg-blue-soft);
  border: 1px solid rgba(26, 92, 255, 0.22);
  border-radius: var(--r-pill);
  padding: 6px 16px;
}

.page-about .tl-stage--on-dark {
  color: var(--mg-paper);
  background: rgba(142, 124, 255, 0.2);
  border-color: rgba(142, 124, 255, 0.45);
}

.page-about .tl-ver {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-42);
  text-transform: uppercase;
}

.page-about .tl-body h2 {
  font-size: clamp(23px, 3.2vw, 38px);
  line-height: 1.22;
  letter-spacing: 0.02em;
  font-weight: 600;
  margin: 0 0 14px;
  max-width: 24ch;
}

.page-about .tl-body p {
  font-size: 17px;
  line-height: 1.7;
  color: var(--ink-80);
  margin: 0 0 16px;
}

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

.page-about .tl-row--slow .tl-body p {
  max-width: 54ch;
}

/* 深色区块 */
.page-about .tl-row--deep {
  background: var(--grad-deep);
  color: var(--mg-paper);
  border-radius: var(--r-lg);
  padding: clamp(24px, 4vw, 48px);
}

.page-about .tl-row--deep .tl-body h2,
.page-about .tl-row--deep .tl-body p {
  color: var(--mg-paper);
}

.page-about .tl-row--deep .tl-body p {
  color: var(--paper-80);
}

.page-about .tl-row--deep .tl-ver {
  color: var(--paper-64);
}

.page-about .tl-row--deep .media {
  background: rgba(251, 252, 254, 0.06);
  border-color: var(--paper-line);
}

.page-about .tl-row--deep .media__caption {
  color: var(--paper-64);
}

/* ---------- 折线图 ---------- */
.page-about .evolve {
  margin: 22px 0 24px;
  padding: clamp(18px, 2.4vw, 28px);
  border: 1px solid var(--paper-line);
  border-radius: var(--r-md);
  background: rgba(251, 252, 254, 0.04);
}

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

.page-about .evolve__note {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper-64);
}

/* ---------- 团队卡片 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
  margin: 8px 0 26px;
}

.page-about .team-card {
  background: var(--mg-paper);
  border: 1px solid var(--mg-line);
  border-radius: var(--r-sm);
  padding: 18px 20px;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  border-color: var(--mg-blue);
  background: var(--mg-blue-soft);
}

.page-about .team-card__name {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 600;
  color: var(--mg-ink);
}

.page-about .team-card__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-64);
}

/* ---------- 版本节奏 ---------- */
.page-about .rhythm {
  list-style: none;
  margin: 6px 0 22px;
  padding: 0;
  border-top: 1px solid var(--mg-line);
}

.page-about .rhythm__item {
  display: grid;
  gap: 8px;
  padding: 18px 0;
  border-bottom: 1px solid var(--mg-line);
}

.page-about .rhythm__key {
  justify-self: start;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--mg-orange);
  background: var(--mg-orange-soft);
  border: 1px solid rgba(255, 107, 53, 0.28);
  border-radius: var(--r-pill);
  padding: 5px 14px;
}

.page-about .rhythm__val {
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink-80);
}

/* ---------- 媒体 ---------- */
.page-about .media {
  margin: 24px 0 0;
}

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

.page-about .media__caption {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-42);
}

/* ---------- 行动区 ---------- */
.page-about .about-cta-section {
  background: var(--mg-paper);
  border-top: 1px solid var(--mg-line);
  padding-block: clamp(40px, 5vw, 72px);
}

.page-about .about-cta-section h2 {
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.2;
  letter-spacing: 0.02em;
  margin: 0 0 clamp(20px, 2.6vw, 30px);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

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

  .page-about .rhythm__item {
    grid-template-columns: 120px minmax(0, 1fr);
    align-items: start;
    gap: 20px;
  }
}

@media (min-width: 900px) {
  .page-about .about-timeline::before {
    content: "";
    position: absolute;
    left: 168px;
    top: 10px;
    bottom: 10px;
    width: 1px;
    background: var(--mg-line);
  }

  .page-about .tl-row {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .tl-mark {
    position: sticky;
    top: 104px;
    align-self: start;
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .page-about .tl-body p {
    max-width: 64ch;
  }

  .page-about .tl-row--deep,
  .page-about .tl-row--deep .tl-mark {
    position: relative;
  }

  .page-about .tl-row--deep .tl-mark {
    position: static;
  }

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

@media (min-width: 1040px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 0.88fr);
    align-items: end;
  }

  .page-about .about-hero__chain {
    margin-bottom: 6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card {
    transition: none;
  }
}