.page-about {
  --about-gap: clamp(56px, 9vw, 112px);
  --about-rail: 96px;
  background: linear-gradient(180deg, var(--ink-900) 0%, var(--ink-850) 46%, var(--ink-900) 100%);
  color: var(--paper);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--bar-h) + 52px) 0 clamp(48px, 8vw, 76px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -34% -14% auto -14%;
  height: 118%;
  background:
    radial-gradient(50% 62% at 16% 14%, rgba(59, 130, 246, 0.24), transparent 72%),
    radial-gradient(42% 54% at 88% 2%, rgba(255, 107, 44, 0.17), transparent 74%);
  pointer-events: none;
}

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

.page-about .about-hero__kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 22px 0 0;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--paper-dim);
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.1rem, 7.4vw, 4.35rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lede {
  margin: 24px 0 0;
  max-width: 58ch;
  font-size: 1.02rem;
  line-height: 1.8;
  color: var(--paper-dim);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 40px 0 0;
  padding: 0;
  list-style: none;
  background: var(--ink-700);
  border: 1px solid var(--ink-700);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-hero__facts li {
  display: grid;
  gap: 6px;
  padding: 18px 16px;
  background: rgba(10, 15, 20, 0.86);
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.35rem, 4vw, 1.85rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-fact__unit {
  margin-left: 2px;
  font-size: 0.62em;
  color: var(--cyan);
}

.page-about .about-fact__label {
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  color: var(--paper-dim);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  position: relative;
  padding: var(--about-gap) 0;
}

.page-about .about-head {
  display: grid;
  gap: 12px;
  max-width: 62ch;
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .about-head__num {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.28em;
  color: var(--blue);
}

.page-about .about-head__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.6rem, 4.6vw, 2.6rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
}

.page-about .about-head__note {
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.78;
  color: var(--paper-dim);
}

.page-about .about-link {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .about-prose p {
  max-width: 62ch;
  margin: 0 0 1.05rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--paper-dim);
}

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

.page-about .about-prose strong {
  color: var(--paper);
  font-weight: 700;
}

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

.page-about .media img {
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 定位 ---------- */
.page-about .about-split {
  display: grid;
  gap: 34px;
}

.page-about .about-points {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: rgba(42, 57, 71, 0.8);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-points li {
  display: grid;
  gap: 7px;
  padding: 18px 20px;
  background: var(--ink-850);
}

.page-about .about-points__k {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  color: var(--orange);
}

.page-about .about-points__v {
  font-size: 0.94rem;
  line-height: 1.72;
  color: var(--paper-dim);
}

/* ---------- 发展节点 ---------- */
.page-about .about-timeline {
  display: grid;
  gap: 28px;
}

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

.page-about .about-timeline__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-node {
  display: grid;
  gap: 12px;
  padding: 30px 0;
  border-top: 1px solid rgba(42, 57, 71, 0.9);
  scroll-margin-top: calc(var(--bar-h) + 44px);
}

.page-about .about-node__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2rem, 6.4vw, 3rem);
  line-height: 1;
  letter-spacing: -0.03em;
  background: linear-gradient(180deg, var(--paper) 6%, #5c7086 126%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

.page-about .about-node__title {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.14rem, 2.8vw, 1.5rem);
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.page-about .about-node__text {
  max-width: 60ch;
  margin: 0;
  font-size: 0.97rem;
  line-height: 1.8;
  color: var(--paper-dim);
}

.page-about .about-history__note {
  max-width: 60ch;
  margin: 32px 0 0;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--paper-dim);
}

.page-about .about-history__media {
  margin: 44px 0 0;
  border: 1px solid var(--ink-700);
  border-radius: var(--r-md);
  overflow: hidden;
}

/* ---------- 数据链路 ---------- */
.page-about .about-flow {
  display: grid;
  gap: 38px;
}

.page-about .about-flow__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-flow__item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  padding: 22px 0;
  border-top: 1px solid rgba(42, 57, 71, 0.85);
}

.page-about .about-flow__item:last-child {
  border-bottom: 1px solid rgba(42, 57, 71, 0.85);
}

.page-about .about-flow__idx {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .about-flow__name {
  margin: 0 0 8px;
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .about-flow__text {
  max-width: 56ch;
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.78;
  color: var(--paper-dim);
}

.page-about .about-flow__figure {
  border: 1px solid var(--ink-700);
  border-radius: var(--r-md);
  overflow: hidden;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 38px;
}

.page-about .about-team__bars {
  display: grid;
  gap: 20px;
  align-content: start;
}

.page-about .about-bar__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 9px;
}

.page-about .about-bar__name {
  font-size: 0.94rem;
  color: var(--paper);
}

.page-about .about-bar__val {
  font-family: var(--font-mono);
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-bar__track {
  height: 10px;
  border-radius: 999px;
  background: var(--ink-800);
  box-shadow: inset 0 0 0 1px var(--ink-700);
  overflow: hidden;
}

.page-about .about-bar__fill {
  display: block;
  height: 100%;
  border-radius: 999px;
}

.page-about .about-bar__fill--eng {
  width: 36.2%;
  background: linear-gradient(90deg, var(--blue-deep), var(--blue));
}

.page-about .about-bar__fill--edit {
  width: 24.1%;
  background: linear-gradient(90deg, var(--clay), var(--orange));
}

.page-about .about-bar__fill--prod {
  width: 19%;
  background: linear-gradient(90deg, #b8901c, var(--signal));
}

.page-about .about-bar__fill--ops {
  width: 20.7%;
  background: linear-gradient(90deg, #4c6a52, var(--moss));
}

.page-about .about-team__total {
  margin: 12px 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--ink-700);
  font-size: 0.95rem;
  line-height: 1.78;
  color: var(--paper-dim);
}

.page-about .about-team__total b {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  color: var(--orange);
}

.page-about .about-team__side {
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .about-team__side .media {
  border: 1px solid var(--ink-700);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-team__caption {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.72;
  color: var(--paper-dim);
}

/* ---------- 覆盖 ---------- */
.page-about .about-cover {
  display: grid;
  gap: 18px;
}

.page-about .about-cover__panel {
  position: relative;
  min-height: 200px;
  border: 1px solid var(--ink-700);
  border-radius: var(--r-lg);
  background-color: var(--ink-850);
  background-image: radial-gradient(circle, rgba(120, 158, 200, 0.42) 1.2px, transparent 1.5px);
  background-size: 20px 20px;
  overflow: hidden;
}

.page-about .about-cover__panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(42% 62% at 22% 34%, rgba(37, 224, 208, 0.17), transparent 70%),
    radial-gradient(38% 58% at 76% 64%, rgba(255, 107, 44, 0.15), transparent 72%),
    radial-gradient(60% 80% at 50% 120%, rgba(59, 130, 246, 0.2), transparent 70%);
}

.page-about .about-cover__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ink-700);
  border: 1px solid var(--ink-700);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-cover__stat {
  display: grid;
  gap: 6px;
  padding: 20px 18px;
  background: rgba(10, 15, 20, 0.88);
}

.page-about .about-cover__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.25rem, 4.4vw, 1.9rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-cover__label {
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  color: var(--paper-dim);
}

.page-about .about-reach__note {
  max-width: 64ch;
  margin: 24px 0 0;
  font-size: 0.97rem;
  line-height: 1.8;
  color: var(--paper-dim);
}

/* ---------- 联系 ---------- */
.page-about .about-legal__rows {
  display: grid;
  gap: 0;
  margin: 0;
  border-top: 1px solid var(--ink-700);
}

.page-about .about-legal__row {
  display: grid;
  grid-template-columns: minmax(88px, 120px) minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid rgba(42, 57, 71, 0.75);
}

.page-about .about-legal__row dt {
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--paper-dim);
}

.page-about .about-legal__row dd {
  margin: 0;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}

.page-about .about-legal__row dd.mono {
  font-family: var(--font-mono);
  letter-spacing: 0.01em;
}

.page-about .about-legal__note {
  max-width: 62ch;
  margin: 24px 0 0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--paper-dim);
}

.page-about .about-legal__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 600px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-cover__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-cover__panel {
    min-height: 240px;
  }
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-flow {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 60px;
    align-items: start;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 56px;
    align-items: start;
  }
}

@media (min-width: 860px) {
  .page-about .about-node {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 36px;
    padding: 38px 0;
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-about .about-timeline {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-timeline__rail {
    display: flex;
    flex-direction: column;
    gap: 2px;
    position: sticky;
    top: calc(var(--bar-h) + 48px);
    padding-left: 18px;
    border-left: 1px solid var(--ink-700);
  }

  .page-about .about-timeline__rail a {
    padding: 5px 0;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    letter-spacing: 0.1em;
    color: var(--paper-dim);
    text-decoration: none;
    transition: color 0.2s var(--ease), transform 0.2s var(--ease);
  }

  .page-about .about-timeline__rail a:hover,
  .page-about .about-timeline__rail a:focus-visible {
    color: var(--cyan);
    transform: translateX(3px);
  }

  .page-about .about-cover__panel {
    min-height: 280px;
  }
}

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