.page-about {
  --about-glow: rgba(36, 240, 216, 0.10);
  --about-rule: rgba(124, 147, 168, 0.22);
  color: var(--mint);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(64px, 13vw, 122px) 0 clamp(34px, 6vw, 62px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -20%;
  top: -46%;
  width: 66%;
  height: 178%;
  background: radial-gradient(circle at 50% 50%, rgba(122, 92, 255, 0.26), transparent 64%);
  pointer-events: none;
}

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

.page-about .about-hero__eyebrow {
  margin: clamp(22px, 4vw, 38px) 0 0;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  max-width: 17ch;
  font-family: var(--font-head);
  font-size: clamp(2rem, 7.6vw, 4.3rem);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: 0.05em;
  color: var(--mint);
}

.page-about .about-hero__lead {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 40ch;
  font-size: clamp(0.98rem, 2.1vw, 1.1rem);
  line-height: 1.85;
  color: rgba(232, 246, 255, 0.86);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: 1px;
  margin: clamp(30px, 5vw, 48px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 15px 16px 17px;
  background: var(--abyss);
}

.page-about .about-fact__v {
  font-size: clamp(1rem, 2.4vw, 1.18rem);
  letter-spacing: 0.07em;
  color: var(--cyan);
}

.page-about .about-fact__k {
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--slate);
}

/* ---------- 区块通用 ---------- */

.page-about .abg-section {
  padding: clamp(48px, 8vw, 92px) 0;
}

.page-about .abg-section__head {
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .about-section__lead {
  margin: 14px 0 0;
  max-width: 42ch;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--slate);
}

.page-about .about-figure {
  margin: 0 0 clamp(28px, 5vw, 48px);
}

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

.page-about .about-figure--tall {
  margin: clamp(30px, 5vw, 52px) 0 0;
}

.page-about .about-figure--side {
  margin: clamp(22px, 4vw, 32px) 0 clamp(24px, 4vw, 34px);
}

.page-about .about-note {
  margin: 0 0 clamp(22px, 4vw, 30px);
  padding-left: 16px;
  border-left: 2px solid var(--magenta);
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--slate);
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(36, 240, 216, 0.22) 55%, rgba(36, 240, 216, 0.05));
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  gap: 8px;
  padding: 26px 0 30px;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-timeline__item:last-child {
  border-bottom: none;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 33px;
  width: 11px;
  height: 11px;
  background: var(--abyss);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 0 4px var(--about-glow);
  transition: background-color 0.25s var(--ease);
}

.page-about .about-timeline__item:hover::before {
  background: var(--cyan);
}

.page-about .about-timeline__year {
  font-size: 1.08rem;
  letter-spacing: 0.09em;
  color: var(--cyan);
}

.page-about .about-timeline__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(1.1rem, 3vw, 1.36rem);
  font-weight: 800;
  letter-spacing: 0.04em;
  line-height: 1.45;
  color: var(--mint);
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 46ch;
  font-size: 0.94rem;
  line-height: 1.85;
  color: rgba(232, 246, 255, 0.74);
}

/* ---------- 对照表 ---------- */

.page-about .about-map__wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  background: rgba(11, 39, 64, 0.62);
  -webkit-overflow-scrolling: touch;
}

.page-about .about-map__table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
}

.page-about .about-map__caption {
  padding: 14px 18px;
  text-align: left;
  font-size: 0.76rem;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--slate);
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-map__table th {
  padding: 13px 18px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 400;
  letter-spacing: 0.14em;
  color: var(--slate);
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

.page-about .about-map__table td {
  padding: 16px 18px;
  vertical-align: top;
  font-size: 0.92rem;
  line-height: 1.7;
  color: rgba(232, 246, 255, 0.8);
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-map__table tbody tr:last-child td {
  border-bottom: none;
}

.page-about .about-map__table tbody tr:hover td {
  background: var(--panel);
}

.page-about .about-map__code {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
  white-space: nowrap;
}

/* ---------- 迭代节奏 ---------- */

.page-about .about-cycle__list {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
}

.page-about .about-cycle__step {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  grid-template-rows: auto auto;
  column-gap: 16px;
  row-gap: 8px;
  padding: 22px 18px 24px;
  background: var(--abyss);
  transition: background-color 0.25s var(--ease);
}

.page-about .about-cycle__step:hover {
  background: var(--reef);
}

.page-about .about-cycle__num {
  grid-column: 1;
  grid-row: 1 / span 2;
  font-size: 1.05rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
  line-height: 1.3;
}

.page-about .about-cycle__title {
  grid-column: 2;
  margin: 0;
  font-family: var(--font-head);
  font-size: 1.02rem;
  font-weight: 800;
  letter-spacing: 0.03em;
  line-height: 1.45;
  color: var(--mint);
}

.page-about .about-cycle__text {
  grid-column: 2;
  margin: 0;
  max-width: 40ch;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--slate);
}

/* ---------- 团队 + 迁移 双栏 ---------- */

.page-about .about-duo__grid {
  display: grid;
  gap: clamp(38px, 6vw, 68px);
}

.page-about .about-team {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-team__row {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  column-gap: 16px;
  padding: 18px 0 20px;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-team__num {
  font-size: 1.16rem;
  letter-spacing: 0.06em;
  color: var(--magenta);
  line-height: 1.4;
}

.page-about .about-team__role {
  margin: 0;
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.03em;
  color: var(--mint);
}

.page-about .about-team__desc {
  margin: 7px 0 0;
  max-width: 38ch;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .about-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: about-step;
}

.page-about .about-step {
  position: relative;
  padding: 20px 0 22px 0;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-step:first-child {
  border-top: 1px solid var(--about-rule);
}

.page-about .about-step__num {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 0.98rem;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .about-step__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 1.02rem;
  font-weight: 800;
  letter-spacing: 0.03em;
  line-height: 1.45;
  color: var(--mint);
}

.page-about .about-step__text {
  margin: 9px 0 0;
  max-width: 38ch;
  font-size: 0.9rem;
  line-height: 1.82;
  color: var(--slate);
}

/* ---------- 运营与备案 ---------- */

.page-about .about-legal__box {
  padding: clamp(24px, 4vw, 38px) clamp(20px, 4vw, 40px);
  border: 1px solid var(--line);
  border-left: 2px solid var(--orange);
  background: linear-gradient(135deg, rgba(18, 50, 83, 0.72), rgba(6, 26, 46, 0.4));
}

.page-about .about-legal__text {
  margin: 14px 0 0;
  max-width: 54ch;
  font-size: 0.93rem;
  line-height: 1.88;
  color: rgba(232, 246, 255, 0.78);
}

/* ---------- 桌面端 ---------- */

@media (min-width: 760px) {
  .page-about .about-cycle__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

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

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

  .page-about .about-cycle__step {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto auto auto;
    row-gap: 12px;
  }

  .page-about .about-cycle__num,
  .page-about .about-cycle__title,
  .page-about .about-cycle__text {
    grid-column: 1;
    grid-row: auto;
  }

  .page-about .about-timeline__item {
    grid-template-columns: 132px minmax(0, 1fr);
    column-gap: 34px;
    align-items: start;
  }

  .page-about .about-timeline__year {
    grid-column: 1;
    grid-row: 1 / span 3;
    padding-top: 2px;
    text-align: right;
  }

  .page-about .about-timeline__title,
  .page-about .about-timeline__text {
    grid-column: 2;
  }

  .page-about .about-hero__lead {
    max-width: 46ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__item::before,
  .page-about .about-cycle__step {
    transition: none;
  }
}
</main>