.page-about {
  --ab-line: rgba(166, 245, 228, .18);
  --ab-line-strong: rgba(47, 227, 198, .55);
  --ab-rule: rgba(166, 245, 228, .14);
  background: var(--night);
  color: var(--cold);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .ab-hero {
  background:
    radial-gradient(120% 92% at 84% 0%, rgba(47, 227, 198, .16) 0%, rgba(10, 26, 18, 0) 58%),
    linear-gradient(180deg, var(--turf-deep) 0%, var(--night) 84%);
  border-bottom: var(--line-soft);
}

.page-about .ab-hero__wrap {
  padding-top: 32px;
  padding-bottom: 44px;
}

.page-about .breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0 0 26px;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--note);
}

.page-about .breadcrumb a {
  color: var(--note);
  text-decoration: none;
}

.page-about .breadcrumb a:hover {
  color: var(--glow);
}

.page-about .breadcrumb li + li::before {
  content: "›";
  margin-right: 6px;
  color: var(--note);
}

.page-about .ab-hero__eyebrow {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--glow);
}

.page-about .ab-hero h1 {
  margin: 0 0 22px;
  max-width: 22ch;
  font-size: clamp(28px, 6.4vw, 54px);
  line-height: 1.16;
  letter-spacing: -.015em;
  font-weight: 800;
  color: var(--paper);
}

.page-about .ab-hero__lede {
  max-width: 60ch;
  margin: 0 0 30px;
  font-size: 1.0625rem;
  line-height: 1.78;
  color: var(--cold);
}

.page-about .ab-hero__jump {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
  padding: 0;
}

.page-about .ab-hero__jump a {
  display: inline-block;
  padding: 8px 15px;
  border: 2px solid var(--ab-line);
  color: var(--glow-soft);
  font-size: 14px;
  text-decoration: none;
  transition: border-color .16s ease, color .16s ease, background-color .16s ease;
}

.page-about .ab-hero__jump a:hover,
.page-about .ab-hero__jump a:focus-visible {
  border-color: var(--glow);
  background: var(--glow);
  color: var(--night);
}

.page-about .ab-hero__media {
  position: relative;
  margin: 0;
  border-top: var(--line-soft);
  overflow: hidden;
}

.page-about .ab-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 26, 18, .10) 0%, rgba(10, 26, 18, .74) 100%);
  pointer-events: none;
}

.page-about .ab-hero__media img {
  display: block;
  width: 100%;
  max-height: 460px;
  object-fit: cover;
  filter: saturate(.75) contrast(1.06);
}

.page-about .ab-band {
  padding: 54px 0;
}

.page-about .ab-band--deep {
  background: var(--turf-deep);
  border-top: var(--line-soft);
  border-bottom: var(--line-soft);
}

.page-about .ab-sec {
  max-width: 68ch;
  margin-bottom: 38px;
}

.page-about .ab-sec__idx {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--glow);
}

.page-about .ab-sec__title {
  margin: 0 0 14px;
  font-size: clamp(23px, 4.6vw, 36px);
  line-height: 1.22;
  letter-spacing: -.01em;
  font-weight: 800;
  color: var(--paper);
}

.page-about .ab-sec__lede {
  margin: 0;
  font-size: 1rem;
  color: var(--cold);
}

/* 时间轴 */
.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-timeline__item {
  position: relative;
  padding: 0 0 38px 30px;
}

.page-about .ab-timeline__item::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 16px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, rgba(47, 227, 198, .72) 0%, rgba(47, 227, 198, .06) 100%);
}

.page-about .ab-timeline__item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 14px;
  height: 14px;
  box-sizing: border-box;
  background: var(--night);
  border: 2px solid var(--glow);
  transition: background-color .18s ease;
}

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

.page-about .ab-timeline__item:last-child::before {
  display: none;
}

.page-about .ab-timeline__item:hover::after {
  background: var(--glow);
}

.page-about .ab-timeline__year {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .08em;
  color: var(--glow);
}

.page-about .ab-timeline__body h3 {
  margin: 0 0 8px;
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .ab-timeline__body p {
  margin: 0;
  max-width: 58ch;
  color: var(--cold);
}

/* 规模数字带 */
.page-about .ab-scale {
  padding: 50px 0;
  background:
    linear-gradient(135deg, var(--turf-deep) 0%, var(--night) 66%),
    var(--night);
  border-top: var(--line-soft);
  border-bottom: var(--line-soft);
}

.page-about .ab-scale__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 26px 18px;
}

.page-about .ab-scale__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 8.4vw, 46px);
  line-height: 1;
  font-weight: 700;
  color: var(--glow);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-scale__unit {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.5;
  letter-spacing: .05em;
  color: var(--note);
}

/* 生产节奏 */
.page-about .ab-rhythm {
  display: grid;
  gap: 34px;
}

.page-about .ab-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--ab-rule);
}

.page-about .ab-steps li {
  padding: 20px 0;
  border-bottom: 2px solid var(--ab-rule);
}

.page-about .ab-steps li:last-child {
  border-bottom: none;
}

.page-about .ab-steps__time {
  position: relative;
  margin: 0 0 8px;
  padding-left: 18px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--glow);
}

.page-about .ab-steps__time::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 7px;
  height: 7px;
  background: var(--glow);
  transform: translateY(-50%) rotate(45deg);
}

.page-about .ab-steps__text {
  margin: 0;
  max-width: 58ch;
  color: var(--cold);
}

.page-about .ab-rhythm__media {
  margin: 0;
}

.page-about .ab-rhythm__media img {
  display: block;
  width: 100%;
  border: 2px solid var(--ab-line);
  filter: saturate(.82);
}

.page-about .ab-rhythm__media figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--note);
}

/* 覆盖范围 */
.page-about .ab-cov {
  margin: 0;
  display: grid;
  gap: 0;
  border-top: 2px solid var(--ab-rule);
}

.page-about .ab-cov__item {
  padding: 20px 0;
  border-bottom: 2px solid var(--ab-rule);
}

.page-about .ab-cov__item dt {
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--glow-soft);
}

.page-about .ab-cov__item dd {
  margin: 8px 0 0;
  max-width: 58ch;
  color: var(--cold);
}

/* 看板 */
.page-about .ab-boards {
  list-style: none;
  margin: 0 0 32px;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .ab-board {
  position: relative;
  overflow: hidden;
  padding: 22px 20px 24px;
  border: 2px solid var(--ab-line);
  background: linear-gradient(155deg, rgba(31, 92, 54, .55) 0%, rgba(10, 26, 18, .92) 72%);
  transition: border-color .16s ease, transform .16s ease, box-shadow .16s ease;
}

.page-about .ab-board:hover,
.page-about .ab-board:focus-within {
  border-color: var(--glow);
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-board__no {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--signal);
}

.page-about .ab-board h3 {
  margin: 0 0 10px;
  font-size: 1.125rem;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .ab-board__desc {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.72;
  color: var(--cold);
}

.page-about .ab-board__hint {
  margin: 16px 0 0;
  padding-left: 10px;
  border-left: 2px solid var(--glow);
  font-size: 13px;
  line-height: 1.6;
  color: var(--glow-soft);
}

.page-about .ab-boards__more {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0;
}

/* 合作 */
.page-about .ab-partners {
  display: grid;
  gap: 32px;
}

.page-about .ab-partners__text p {
  margin: 0;
  max-width: 58ch;
  color: var(--cold);
}

.page-about .ab-partners__list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
}

.page-about .ab-partners__list li {
  position: relative;
  padding: 14px 0 14px 22px;
  border-bottom: 2px solid var(--ab-rule);
  font-size: .9375rem;
  color: var(--cold);
}

.page-about .ab-partners__list li:first-child {
  border-top: 2px solid var(--ab-rule);
}

.page-about .ab-partners__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 25px;
  width: 8px;
  height: 8px;
  background: var(--glow);
}

.page-about .ab-partners__media {
  margin: 0;
}

.page-about .ab-partners__media img {
  display: block;
  width: 100%;
  border: 2px solid var(--ab-line);
}

/* 读者 */
.page-about .ab-aud {
  display: grid;
  gap: 34px;
}

.page-about .ab-aud__nums {
  display: grid;
  gap: 22px;
  padding: 24px 22px;
  border: 2px solid var(--ab-line-strong);
  background: linear-gradient(160deg, rgba(110, 75, 224, .20) 0%, rgba(43, 123, 224, .10) 100%);
}

.page-about .ab-aud__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 6.4vw, 40px);
  line-height: 1;
  font-weight: 700;
  color: var(--glow);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-aud__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: .05em;
  color: var(--note);
}

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

.page-about .ab-aud__roles li {
  padding: 18px 0;
  border-top: 2px solid var(--ab-rule);
}

.page-about .ab-aud__roles li:last-child {
  border-bottom: 2px solid var(--ab-rule);
}

.page-about .ab-aud__roles h3 {
  margin: 0 0 6px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-aud__roles p {
  margin: 0;
  max-width: 60ch;
  font-size: .9375rem;
  color: var(--cold);
}

/* 收束 */
.page-about .ab-cta {
  padding: 62px 0 76px;
  border-top: var(--line-soft);
  background:
    radial-gradient(90% 130% at 10% 112%, rgba(47, 227, 198, .14) 0%, rgba(10, 26, 18, 0) 62%),
    var(--night);
}

.page-about .ab-cta__title {
  margin: 0 0 14px;
  max-width: 24ch;
  font-size: clamp(22px, 4.6vw, 32px);
  line-height: 1.24;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .ab-cta__text {
  margin: 0 0 26px;
  max-width: 58ch;
  color: var(--cold);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0;
}

@media (min-width: 760px) {
  .page-about .ab-hero__wrap {
    padding-top: 42px;
    padding-bottom: 54px;
  }

  .page-about .ab-hero__media img {
    max-height: 520px;
  }

  .page-about .ab-band {
    padding: 72px 0;
  }

  .page-about .ab-scale {
    padding: 66px 0;
  }

  .page-about .ab-scale__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 34px 24px;
  }

  .page-about .ab-boards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-cov {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 42px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-timeline__item {
    display: grid;
    grid-template-columns: 168px minmax(0, 1fr);
    column-gap: 34px;
    padding-left: 34px;
  }

  .page-about .ab-timeline__year {
    padding-top: 2px;
  }

  .page-about .ab-rhythm {
    grid-template-columns: minmax(0, 1fr) minmax(0, 360px);
    gap: 46px;
    align-items: start;
  }

  .page-about .ab-partners {
    grid-template-columns: minmax(0, 1fr) minmax(0, 340px);
    gap: 48px;
    align-items: start;
  }

  .page-about .ab-aud {
    grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }
}

@media (hover: hover) and (min-width: 900px) {
  .page-about .ab-board {
    padding-bottom: 58px;
  }

  .page-about .ab-board__hint {
    position: absolute;
    left: -2px;
    right: -2px;
    bottom: -2px;
    margin: 0;
    padding: 12px 18px;
    border: 2px solid var(--glow);
    background: var(--turf-mid);
    color: var(--glow-soft);
    opacity: 0;
    transform: translateY(100%);
    transition: opacity .18s ease, transform .18s ease;
    pointer-events: none;
  }

  .page-about .ab-board:hover .ab-board__hint,
  .page-about .ab-board:focus-within .ab-board__hint {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (min-width: 1100px) {
  .page-about .ab-scale__list {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .ab-boards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}