.page-about {
  --about-pad: 20px;
  --about-max: 1180px;
  --about-block: 60px;
  background: var(--bg);
  color: var(--text);
}

.page-about .about-inner {
  width: 100%;
  max-width: var(--about-max);
  margin-inline: auto;
  padding-inline: var(--about-pad);
}

/* 面包屑 */
.page-about .about-crumb {
  position: relative;
  z-index: 2;
  margin: 0 0 26px;
  font-size: 12px;
  letter-spacing: 0.08em;
}
.page-about .about-crumb .crumb__link {
  color: var(--mist);
  text-decoration: none;
}
.page-about .about-crumb .crumb__link:hover,
.page-about .about-crumb .crumb__link:focus-visible {
  color: var(--lime);
}
.page-about .about-crumb .crumb__sep {
  color: #2A4A42;
  padding-inline: 8px;
}
.page-about .about-crumb .crumb__current {
  color: var(--cream);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink-800);
  color: var(--cream);
  border-bottom: 1px solid var(--line);
  padding-block: 22px 52px;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -20%;
  right: -14%;
  width: 74%;
  height: 130%;
  background: linear-gradient(155deg, rgba(200, 255, 61, 0.16), rgba(14, 34, 51, 0) 62%);
  clip-path: polygon(26% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: repeating-linear-gradient(90deg, var(--line) 0 24px, transparent 24px 48px);
}
.page-about .about-hero__grid {
  position: relative;
  z-index: 2;
  display: grid;
  gap: 34px;
}
.page-about .about-hero .eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--lime);
}
.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 6.6vw, 64px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--cream);
}
.page-about .about-hero__lede {
  max-width: 46ch;
  margin: 18px 0 0;
  font-size: clamp(15px, 1.8vw, 17px);
  line-height: 1.85;
  color: var(--mist);
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
  background: rgba(7, 17, 15, 0.42);
}
.page-about .about-stat {
  padding: 15px 14px 16px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  min-width: 0;
}
.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 800;
  font-size: clamp(24px, 4.4vw, 36px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--lime);
}
.page-about .about-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.06em;
  line-height: 1.5;
  color: var(--mist);
}

/* 章节通用 */
.page-about .about-section {
  padding-block: var(--about-block);
}
.page-about .about-section--dark {
  background: var(--ink-700);
  color: var(--cream);
}
.page-about .about-section--deep {
  background: var(--ink-800);
  color: var(--cream);
  padding-bottom: calc(var(--about-block) + 10px);
}
.page-about .about-section__head {
  max-width: 64ch;
  margin-bottom: 34px;
}
.page-about .about-section__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--brick);
}
.page-about .about-section--dark .about-section__num,
.page-about .about-section--deep .about-section__num {
  color: var(--lime);
}
.page-about .about-section__title {
  margin: 10px 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 4.2vw, 40px);
  line-height: 1.16;
  letter-spacing: -0.02em;
}
.page-about .about-section__lede {
  margin: 0;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
  color: var(--text-dim);
}
.page-about .about-section--dark .about-section__lede,
.page-about .about-section--deep .about-section__lede {
  color: var(--mist);
}

/* 编年 */
.page-about .about-era__body {
  display: grid;
  gap: 22px;
}
.page-about .about-ruler {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: thin;
}
.page-about .about-ruler__item {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--edge);
  background: var(--surface);
  color: var(--text-dim);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}
.page-about .about-ruler__item::before {
  content: "";
  width: 12px;
  height: 1px;
  background: currentColor;
  flex: 0 0 auto;
}
.page-about .about-ruler__item:hover,
.page-about .about-ruler__item:focus-visible {
  color: var(--accent-ink);
  background: var(--lime);
  border-color: var(--lime);
  outline: none;
}
.page-about .about-ruler__year {
  font-weight: 700;
}

.page-about .about-boards {
  display: grid;
  gap: 16px;
  min-width: 0;
}
.page-about .about-board {
  position: relative;
  min-width: 0;
  padding: 22px 18px;
  background: var(--surface);
  border: 1px solid var(--edge);
  transition: transform 0.3s ease, border-color 0.3s ease;
}
.page-about .about-board::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: var(--brick);
}
.page-about .about-board--dark {
  background: var(--ink-700);
  color: var(--cream);
  border-color: var(--line);
}
.page-about .about-board--dark::after {
  background: var(--lime);
}
.page-about .about-board__year {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 800;
  font-size: clamp(28px, 6vw, 48px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--accent-alt);
}
.page-about .about-board--dark .about-board__year {
  color: var(--amber);
}
.page-about .about-board__title {
  margin: 12px 0 10px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  line-height: 1.4;
  letter-spacing: -0.01em;
}
.page-about .about-board__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-dim);
}
.page-about .about-board--dark .about-board__text {
  color: var(--mist);
}
.page-about .about-board--lead {
  display: grid;
  gap: 18px;
}
.page-about .about-board__figure {
  margin: 0;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  clip-path: polygon(0 0, 100% 3%, 100% 100%, 0 97%);
}
.page-about .about-board__figure img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

/* 数据流程 */
.page-about .about-check__grid {
  display: grid;
  gap: 28px;
}
.page-about .about-steps {
  display: grid;
  gap: 0;
}
.page-about .about-step {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 12px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}
.page-about .about-step:last-child {
  border-bottom: 1px solid var(--line);
}
.page-about .about-step__no {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--lime);
  padding-top: 2px;
}
.page-about .about-step__t {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--cream);
}
.page-about .about-step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}
.page-about .about-figure {
  margin: 0;
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 7 / 4;
  object-fit: cover;
  clip-path: polygon(0 4%, 100% 0, 100% 96%, 0 100%);
}
.page-about .about-figure__cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* 团队条带 */
.page-about .about-team__strip {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.page-about .about-team__band {
  flex: 1 1 auto;
  min-width: 0;
  padding: 18px 16px;
  background: var(--surface-2);
  border: 1px solid var(--edge);
  border-left-width: 4px;
  border-left-color: var(--brick);
  transition: background 0.25s ease, transform 0.25s ease, border-color 0.25s ease;
}
.page-about .about-team__band:nth-child(1) { border-left-color: var(--lime); }
.page-about .about-team__band:nth-child(2) { border-left-color: var(--amber); }
.page-about .about-team__band:nth-child(3) { border-left-color: var(--rose); }
.page-about .about-team__band:nth-child(4) { border-left-color: var(--brick); }
.page-about .about-team__band:hover,
.page-about .about-team__band:focus-within,
.page-about .about-team__band:focus {
  background: var(--surface);
  outline: none;
}
.page-about .about-team__band:focus-visible {
  border-color: var(--accent-alt);
}
.page-about .about-team__name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--text);
}
.page-about .about-team__duty {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dim);
}
.page-about .about-team__scale {
  margin: 18px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.09em;
  color: var(--text-dim);
}

/* 覆盖范围 */
.page-about .about-cover__banner {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 8 / 3;
  object-fit: cover;
  margin-top: 4px;
  opacity: 0.88;
}
.page-about .about-cover__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
  margin-top: 30px;
}
.page-about .about-cover__item {
  padding: 18px 14px 20px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  min-width: 0;
}
.page-about .about-cover__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 800;
  font-size: clamp(26px, 5vw, 42px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--lime);
}
.page-about .about-cover__label {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--mist);
}
.page-about .about-sports {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 26px;
}
.page-about .about-sports span {
  padding: 6px 11px;
  border: 1px solid var(--line);
  background: rgba(243, 238, 226, 0.05);
  font-size: 13px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--cream);
}

/* 长期跟队 */
.page-about .about-follow__grid {
  display: grid;
  gap: 26px;
}
.page-about .about-follow__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}
.page-about .about-follow__item {
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr);
  gap: 12px;
  padding: 16px 0;
  border-top: 1px solid var(--edge);
}
.page-about .about-follow__item:last-child {
  border-bottom: 1px solid var(--edge);
}
.page-about .about-follow__k {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.09em;
  color: var(--brick);
  padding-top: 5px;
}
.page-about .about-follow__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-dim);
}
.page-about .about-follow__aside {
  padding: 20px 18px;
  background: var(--surface-2);
  border: 1px solid var(--edge);
  border-top: 3px solid var(--accent-alt);
}
.page-about .about-follow__aside p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-dim);
}
.page-about .about-follow__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

/* 沟通 */
.page-about .about-contact__grid {
  display: grid;
  gap: 14px;
}
.page-about .about-contact__block {
  padding: 18px 16px;
  border: 1px solid var(--line);
  background: rgba(243, 238, 226, 0.04);
  min-width: 0;
}
.page-about .about-contact__label {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--lime);
}
.page-about .about-contact__value {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--cream);
  overflow-wrap: anywhere;
}

/* 行动区 */
.page-about .about-cta {
  background: var(--lime);
  color: var(--accent-ink);
  padding-block: 42px;
}
.page-about .about-cta__inner {
  display: flex;
  flex-direction: column;
  gap: 22px;
}
.page-about .about-cta h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 3.6vw, 32px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--accent-ink);
}
.page-about .about-cta p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(11, 31, 28, 0.78);
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-about .about-cta__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  background: var(--ink-800);
  color: var(--cream);
  border: 1px solid var(--ink-800);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease;
}
.page-about .about-cta__btn:hover,
.page-about .about-cta__btn:focus-visible {
  background: var(--ink-900);
  outline: none;
}
.page-about .about-cta__btn--ghost {
  background: transparent;
  color: var(--ink-800);
  border-color: rgba(11, 31, 28, 0.5);
}
.page-about .about-cta__btn--ghost:hover,
.page-about .about-cta__btn--ghost:focus-visible {
  background: rgba(11, 31, 28, 0.1);
  color: var(--ink-800);
}

/* 显现动效 */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.page-about [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

@media (min-width: 720px) {
  .page-about {
    --about-pad: 32px;
    --about-block: 84px;
  }
  .page-about .about-hero {
    padding-block: 26px 64px;
  }
  .page-about .about-board {
    padding: 28px 26px;
  }
  .page-about .about-boards > .about-board:nth-child(2) {
    margin-inline-start: 26px;
  }
  .page-about .about-boards > .about-board:nth-child(4) {
    margin-inline-start: 52px;
  }
  .page-about .about-board--lead {
    grid-template-columns: 200px minmax(0, 1fr);
    align-items: start;
    gap: 24px;
  }
  .page-about .about-board__figure {
    aspect-ratio: 3 / 4;
    height: 100%;
  }
  .page-about .about-cover__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-cta__inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
  .page-about .about-cta__text {
    max-width: 46ch;
  }
}

@media (min-width: 900px) {
  .page-about {
    --about-block: 108px;
  }
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.85fr);
    align-items: end;
    gap: 44px;
  }
  .page-about .about-era__body {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }
  .page-about .about-ruler {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    position: sticky;
    top: calc(var(--bar-h) + 28px);
    padding-bottom: 0;
  }
  .page-about .about-ruler__item {
    display: block;
    padding: 12px 0 12px 16px;
    border: 0;
    border-left: 1px solid var(--edge-strong);
    background: transparent;
    font-size: 16px;
    letter-spacing: 0;
  }
  .page-about .about-ruler__item::before {
    display: none;
  }
  .page-about .about-ruler__item:hover,
  .page-about .about-ruler__item:focus-visible {
    background: transparent;
    border-left: 2px solid var(--accent-alt);
    padding-left: 15px;
    color: var(--text);
  }
  .page-about .about-check__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 48px;
    align-items: start;
  }
  .page-about .about-team__strip {
    flex-direction: row;
    align-items: stretch;
    gap: 6px;
    min-height: 200px;
  }
  .page-about .about-team__band {
    flex: 1 1 0;
    padding: 22px 18px;
  }
  .page-about .about-team__band:nth-child(1) { flex-grow: 36; }
  .page-about .about-team__band:nth-child(2) { flex-grow: 27; }
  .page-about .about-team__band:nth-child(3) { flex-grow: 20; }
  .page-about .about-team__band:nth-child(4) { flex-grow: 17; }
  .page-about .about-team__band:hover,
  .page-about .about-team__band:focus-within {
    transform: translateY(-4px);
  }
  .page-about .about-follow__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 44px;
    align-items: start;
  }
  .page-about .about-contact__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
  .page-about .about-cover__banner {
    aspect-ratio: 8 / 2.6;
  }
}

@media (min-width: 1180px) {
  .page-about {
    --about-pad: 40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .page-about .about-board,
  .page-about .about-team__band,
  .page-about .about-ruler__item {
    transition: none;
  }
}
</main>