.page-about {
  --about-head-w: 4fr;
  --about-body-w: 7fr;
}

.page-about .about-hero {
  position: relative;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(36px, 6vw, 96px) var(--edge) clamp(32px, 5vw, 72px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: var(--edge);
  right: var(--edge);
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), rgba(95, 233, 255, 0));
}

.page-about .about-hero h1 {
  margin: 16px 0 0;
  max-width: 15em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(38px, 6.4vw, 84px);
  line-height: 0.98;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-about .about-hero__lead {
  margin: clamp(16px, 2.4vw, 28px) 0 0;
  max-width: 60ch;
  color: rgba(232, 241, 246, 0.84);
  line-height: 1.8;
}

.page-about .about-figures {
  list-style: none;
  margin: clamp(28px, 4vw, 52px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border-top: 1px solid var(--line);
}

.page-about .about-figures__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px 18px;
  background: var(--night);
}

.page-about .about-figures__v {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 42px);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.01em;
}

.page-about .about-figures__l {
  font-size: 13px;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .about-chapter {
  padding: clamp(48px, 7vw, 112px) var(--edge);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-chapter--night {
  background: transparent;
}

.page-about .about-chapter--teal {
  background: var(--teal);
}

.page-about .about-chapter--indigo {
  background: var(--indigo);
}

.page-about .about-chapter__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid;
  gap: clamp(20px, 3vw, 40px);
}

.page-about .about-chapter__head {
  position: relative;
  padding-left: 18px;
}

.page-about .about-chapter__head::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 4px;
  background: var(--cyan);
}

.page-about .about-chapter__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(64px, 10vw, 120px);
  line-height: 0.8;
  letter-spacing: -0.02em;
  color: rgba(232, 241, 246, 0.14);
}

.page-about .about-chapter__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3vw, 40px);
  line-height: 1.15;
  color: var(--ice);
}

.page-about .about-chapter__body p {
  margin: 0 0 16px;
  max-width: 66ch;
  font-size: clamp(15px, 1.05vw, 17px);
  line-height: 1.8;
  color: rgba(232, 241, 246, 0.86);
}

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

/* 七类栏目资料地图 */
.page-about .about-map {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .about-map__item {
  padding: 16px 14px 18px;
  background: rgba(95, 233, 255, 0.05);
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--cyan);
  transition: background var(--t-fast), transform var(--t-fast), border-color var(--t-fast);
}

.page-about .about-map__item:hover {
  background: var(--glass);
  border-left-color: var(--orange);
  transform: translateY(-2px);
}

.page-about .about-map__name {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.2;
  color: var(--ice);
}

.page-about .about-map__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--mist);
}

/* 四步流程 */
.page-about .about-steps {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-steps__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--line-soft);
}

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

.page-about .about-steps__idx {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .about-steps__item h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 600;
  color: var(--ice);
}

.page-about .about-steps__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist);
}

/* 版本时间线 */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 28px 0 0;
  padding: 0 0 0 26px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 26px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(95, 233, 255, 0.08));
}

.page-about .about-timeline__node {
  position: relative;
  padding-bottom: 30px;
}

.page-about .about-timeline__node:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__node::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 9px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-about .about-timeline__code {
  display: inline-block;
  margin-bottom: 8px;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  border: 1px solid var(--line);
}

.page-about .about-timeline__title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 600;
  color: var(--ice);
  transition: color var(--t-fast);
}

.page-about .about-timeline__node:hover .about-timeline__title {
  color: var(--cyan);
}

.page-about .about-timeline__node p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist);
}

/* 团队与生态 */
.page-about .about-team {
  display: grid;
  gap: 24px;
}

/* 图片与其他 */
.page-about .about-figure {
  margin: 26px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--line-soft);
}

.page-about .about-figure__cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* 收尾引导 */
.page-about .about-cta {
  padding: clamp(48px, 7vw, 104px) var(--edge);
  border-top: 1px solid var(--line-soft);
  background: linear-gradient(180deg, var(--night) 0%, var(--wine) 100%);
}

.page-about .about-cta__inner {
  max-width: var(--maxw);
  margin: 0 auto;
}

.page-about .about-cta h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(28px, 4vw, 52px);
  line-height: 1.1;
  color: var(--ice);
}

.page-about .about-cta p {
  margin: 14px 0 0;
  max-width: 56ch;
  font-size: clamp(15px, 1.05vw, 17px);
  line-height: 1.8;
  color: rgba(232, 241, 246, 0.82);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-cta__note {
  font-size: 14px;
  color: var(--mist);
}

.page-about .about-cta__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: border-color var(--t-fast), color var(--t-fast);
}

.page-about .about-cta__note a:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

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

  .page-about .about-map {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .about-map__item--a2 {
    grid-column: span 2;
  }

  .page-about .about-map__item--a3 {
    grid-column: span 3;
  }

  .page-about .about-map__item--a4 {
    grid-column: span 4;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
    gap: clamp(24px, 4vw, 48px);
  }

  .page-about .about-team .about-figure {
    margin-top: 0;
  }
}

@media (min-width: 920px) {
  .page-about .about-chapter__inner {
    grid-template-columns: minmax(0, var(--about-head-w)) minmax(0, var(--about-body-w));
    gap: clamp(32px, 5vw, 88px);
    align-items: start;
  }

  .page-about .about-chapter__head {
    position: sticky;
    top: calc(var(--bar-h) + 24px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    animation: none !important;
    transition: none !important;
  }
}