.page-about {
  --about-axis-w: 168px;
  --about-axis-gap: clamp(32px, 5vw, 72px);
  position: relative;
  background: var(--ink-900);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .shell {
  position: relative;
  z-index: 1;
}

/* ---------- 首屏框景 ---------- */

.page-about .about-hero {
  position: relative;
  padding-block: clamp(18px, 3vw, 34px) clamp(46px, 7vw, 92px);
  border-bottom: 1px solid var(--hair-soft);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -22%;
  right: -16%;
  width: min(760px, 82vw);
  aspect-ratio: 1 / 1;
  border-radius: 44% 56% 58% 42% / 52% 44% 56% 48%;
  background: radial-gradient(circle at 42% 42%, rgba(0, 232, 210, .16), rgba(0, 232, 210, 0) 70%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(20px, 3.2vw, 38px);
  align-items: center;
}

.page-about .about-hero__stamp {
  display: inline-block;
  margin: 0;
  padding: 6px 14px;
  border: 1px solid var(--hair);
  border-radius: 999px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .about-hero__title {
  margin: .45em 0 .5em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.05rem, 6vw, 3.7rem);
  line-height: 1.08;
  letter-spacing: -.015em;
  color: var(--paper);
}

.page-about .about-hero__title em {
  font-style: normal;
  background: linear-gradient(180deg, transparent 74%, rgba(0, 232, 210, .34) 74%);
}

.page-about .about-hero__lede {
  max-width: 56ch;
  margin: 0;
  font-size: clamp(1rem, 1.6vw, 1.09rem);
  line-height: 1.8;
  color: var(--paper-soft);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-hero__media {
  margin: 0;
  border-radius: var(--radius-l);
  overflow: hidden;
  box-shadow: var(--shadow-band);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .84fr);
    gap: clamp(36px, 5vw, 76px);
  }
}

/* ---------- 章节与刻度轴 ---------- */

.page-about .about-section {
  position: relative;
  padding-block: clamp(40px, 6.5vw, 84px);
}

.page-about .about-section--band {
  background: var(--ink-800);
  border-block: 1px solid var(--hair-soft);
}

.page-about .about-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2.5vw, 22px);
}

.page-about .about-axis {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-axis__link {
  display: block;
  text-decoration: none;
  color: inherit;
}

.page-about .about-axis__num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(1.4rem, 3.2vw, 2.25rem);
  font-weight: 700;
  line-height: 1;
  color: var(--mist);
  opacity: .38;
  transition: color .3s var(--ease), opacity .3s var(--ease);
}

.page-about .about-axis__name {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--mist);
  opacity: .78;
}

.page-about .about-axis__link:hover .about-axis__num,
.page-about .about-axis__link:focus-visible .about-axis__num,
.page-about .about-axis__link.is-current .about-axis__num {
  color: var(--cyan);
  opacity: 1;
}

@media (min-width: 860px) {
  .page-about .about-row {
    grid-template-columns: var(--about-axis-w) minmax(0, 1fr);
    gap: var(--about-axis-gap);
  }

  .page-about .about-axis {
    display: block;
    text-align: right;
    padding-right: clamp(18px, 2.4vw, 30px);
    border-right: 1px solid var(--hair-soft);
  }
}

/* ---------- 标题与正文 ---------- */

.page-about .about-section__title {
  margin: 0 0 .55em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.4vw, 2.25rem);
  line-height: 1.2;
  letter-spacing: -.005em;
  color: var(--paper);
}

.page-about .prose p {
  max-width: 68ch;
  margin: 0 0 1.05em;
  color: var(--paper-soft);
  line-height: 1.8;
}

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

.page-about .prose a {
  color: var(--cyan);
  text-underline-offset: 3px;
}

/* ---------- 图文并列 ---------- */

.page-about .about-split {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-split__media {
  margin: 0;
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-split__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.24fr) minmax(0, .96fr);
    align-items: start;
  }

  .page-about .about-split--flip {
    grid-template-columns: minmax(0, .96fr) minmax(0, 1.24fr);
  }

  .page-about .about-split--flip .about-split__media {
    order: -1;
  }
}

/* ---------- 团队分工 ---------- */

.page-about .about-duty {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  border-top: 1px solid var(--hair-soft);
}

.page-about .about-duty__item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--hair-soft);
}

.page-about .about-duty__num {
  font-family: var(--font-num);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--cyan);
  min-width: 2.6ch;
}

.page-about .about-duty__role {
  font-weight: 600;
  color: var(--paper);
  font-size: .98rem;
}

.page-about .about-duty__desc {
  flex: 1 1 220px;
  color: var(--mist);
  font-size: .93rem;
  line-height: 1.7;
}

.page-about .about-callout {
  margin-top: clamp(22px, 3vw, 30px);
  max-width: 66ch;
  line-height: 1.8;
}

/* ---------- 三个习惯 ---------- */

.page-about .about-habits {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--hair-soft);
}

.page-about .about-habits__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 18px;
  padding: clamp(18px, 2.4vw, 26px) 0;
  border-bottom: 1px solid var(--hair-soft);
}

.page-about .about-habits__idx {
  font-family: var(--font-num);
  font-size: .86rem;
  letter-spacing: .12em;
  color: var(--orange);
  padding-top: .35em;
}

.page-about .about-habits__title {
  margin: 0 0 .4em;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.1rem, 2.2vw, 1.35rem);
  color: var(--paper);
}

.page-about .about-habits__text {
  margin: 0;
  max-width: 62ch;
  color: var(--mist);
  line-height: 1.78;
  font-size: .96rem;
}

/* ---------- 版本时间线 ---------- */

.page-about .about-timeline {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 clamp(24px, 3.2vw, 36px) 26px;
  border-left: 1px solid var(--hair);
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-timeline__dot {
  position: absolute;
  left: -4.5px;
  top: 7px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--cyan-dim);
}

.page-about .about-timeline__ver {
  display: inline-block;
  margin-bottom: 6px;
  font-family: var(--font-num);
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--cyan);
}

.page-about .about-timeline__title {
  margin: 0 0 .35em;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  color: var(--paper);
}

.page-about .about-timeline__note {
  margin: 0;
  max-width: 62ch;
  color: var(--mist);
  line-height: 1.75;
  font-size: .96rem;
  transition: color .3s var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__note,
.page-about .about-timeline__item:focus-within .about-timeline__note {
  color: var(--paper-soft);
}

@keyframes about-node-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(0, 232, 210, .42); }
  50% { box-shadow: 0 0 0 8px rgba(0, 232, 210, 0); }
}

.page-about .about-timeline__item.is-live .about-timeline__dot {
  background: var(--cyan);
  border-color: var(--cyan);
  animation: about-node-pulse 2s ease-in-out infinite;
}

.page-about .about-milestone__tail {
  margin: clamp(24px, 3.2vw, 34px) 0 0;
  max-width: 66ch;
  color: var(--mist);
  line-height: 1.8;
  font-size: .96rem;
}

.page-about .about-milestone__tail a {
  color: var(--cyan);
  text-underline-offset: 3px;
}

/* ---------- 继续浏览 ---------- */

.page-about .about-next__lede {
  margin: 0;
  max-width: 58ch;
  color: var(--mist);
  line-height: 1.8;
}

.page-about .about-next {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
}

.page-about .about-next__link {
  display: grid;
  grid-template-columns: 3.4ch minmax(0, 1fr) auto;
  grid-template-areas:
    "key title arrow"
    "key desc  arrow";
  gap: 4px 18px;
  align-items: center;
  padding: clamp(16px, 2.2vw, 22px) 0;
  min-height: 44px;
  border-bottom: 1px solid var(--hair-soft);
  text-decoration: none;
  color: inherit;
}

.page-about .about-next__key {
  grid-area: key;
  align-self: center;
  font-family: var(--font-num);
  font-size: .84rem;
  color: var(--mist);
  letter-spacing: .08em;
}

.page-about .about-next__title {
  grid-area: title;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--paper);
}

.page-about .about-next__desc {
  grid-area: desc;
  font-size: .92rem;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .about-next__arrow {
  grid-area: arrow;
  align-self: center;
  font-size: 1.15rem;
  color: var(--cyan-dim);
  transition: transform .3s var(--ease), color .3s var(--ease);
}

.page-about .about-next__link:hover .about-next__arrow,
.page-about .about-next__link:focus-visible .about-next__arrow {
  color: var(--cyan);
  transform: translateX(4px);
}

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

/* ---------- 窄屏修正 ---------- */

@media (max-width: 600px) {
  .page-about .about-axis {
    flex-wrap: wrap;
    gap: 6px 10px;
  }

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

  .page-about .about-next__link {
    grid-template-columns: 2.8ch minmax(0, 1fr) auto;
    gap: 4px 12px;
  }

  .page-about .about-duty__desc {
    flex-basis: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__item.is-live .about-timeline__dot {
    animation: none;
  }

  .page-about .about-axis__num,
  .page-about .about-next__arrow,
  .page-about .about-timeline__note {
    transition: none;
  }
}