.page-about {
  background: var(--paper);
  color: var(--char);
}

.page-about .crumbs {
  padding-block: 16px 0;
}

.page-about .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--moss);
}

.page-about .crumbs li {
  display: flex;
  align-items: center;
  gap: 6px;
}

.page-about .crumbs li + li::before {
  content: "/";
  color: var(--line);
}

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

.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  color: var(--green-900);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  margin-top: 16px;
  overflow: hidden;
  isolation: isolate;
  background: var(--green-950);
  color: var(--paper);
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  opacity: 0.3;
  filter: grayscale(0.5);
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, rgba(7, 42, 32, 0.97) 0%, rgba(7, 42, 32, 0.86) 48%, rgba(11, 61, 46, 0.56) 100%);
}

.page-about .about-hero__inner {
  position: relative;
  padding-block: 56px 60px;
}

.page-about .about-hero__kicker {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  max-width: 15em;
  font-size: clamp(30px, 6.2vw, 62px);
  line-height: 1.06;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  margin: 0 0 28px;
  max-width: 34em;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(244, 241, 233, 0.82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

@media (min-width: 768px) {
  .page-about .about-hero__inner {
    padding-block: 96px 108px;
  }

  .page-about .about-hero__lead {
    font-size: 16px;
  }
}

/* 章册主体 */
.page-about .about-book {
  display: block;
  padding-block: 44px 0;
}

.page-about .about-index {
  margin-bottom: 32px;
}

.page-about .about-index__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--moss);
}

.page-about .about-index__list {
  display: flex;
  gap: 4px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 7px;
  padding: 8px 10px 8px 12px;
  border-left: 2px solid transparent;
  font-size: 13px;
  color: var(--moss);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--green-900);
  border-left-color: var(--line);
}

.page-about .about-index__link[aria-current="true"] {
  color: var(--green-900);
  border-left-color: var(--cyan);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--amber-deep);
}

@media (min-width: 900px) {
  .page-about .about-book {
    display: grid;
    grid-template-columns: 148px minmax(0, 1fr);
    column-gap: 56px;
    align-items: start;
    padding-block: 72px 0;
  }

  .page-about .about-index {
    position: sticky;
    top: 96px;
    margin-bottom: 0;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding: 0;
  }
}

/* 章节 */
.page-about .chapter {
  position: relative;
  padding-bottom: 52px;
  margin-bottom: 52px;
  border-bottom: 1px solid var(--line);
}

.page-about .chapter:last-child {
  border-bottom: 0;
  margin-bottom: 0;
}

.page-about .chapter__num {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: clamp(52px, 9vw, 104px);
  font-weight: 700;
  line-height: 0.82;
  letter-spacing: -0.05em;
  color: var(--paper-200);
}

.page-about .chapter__title {
  margin: 0 0 20px;
  max-width: 20em;
  font-size: clamp(21px, 3.4vw, 30px);
  line-height: 1.28;
  font-weight: 700;
  color: var(--green-900);
}

.page-about .chapter__body p {
  margin: 0 0 16px;
  max-width: 33em;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--char);
}

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

.page-about .chapter__body a {
  color: var(--green-900);
  text-decoration: underline;
  text-decoration-color: var(--cyan);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.page-about .chapter__body a:hover,
.page-about .chapter__body a:focus-visible {
  color: var(--amber-deep);
}

.page-about .chapter__grid {
  display: block;
}

.page-about .chapter__figure {
  margin: 26px 0 0;
}

.page-about .chapter__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--green-600);
  background: var(--green-950);
}

.page-about .chapter__figure figcaption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.65;
  letter-spacing: 0.02em;
  color: var(--moss);
}

@media (min-width: 1024px) {
  .page-about .chapter__grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 40px;
    align-items: start;
  }

  .page-about .chapter__figure {
    margin: 4px 0 0 -24px;
  }
}

/* 引用块 */
.page-about .pull {
  margin: 26px 0 0;
  padding: 22px 24px;
  max-width: 33em;
  background: var(--green-900);
  color: var(--paper);
  border-left: 4px solid var(--cyan);
  font-size: 15.5px;
  line-height: 1.72;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}

/* 团队构成 */
.page-about .roster {
  display: grid;
  gap: 18px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .roster__item {
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.page-about .roster__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.page-about .roster__name {
  font-size: 15px;
  font-weight: 700;
  color: var(--green-900);
}

.page-about .roster__count {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--amber-deep);
}

.page-about .roster__bar {
  display: block;
  height: 6px;
  background: var(--paper-200);
}

.page-about .roster__fill {
  display: block;
  height: 100%;
  background: var(--cyan);
}

.page-about .roster__item:nth-child(1) .roster__fill {
  width: 100%;
}

.page-about .roster__item:nth-child(2) .roster__fill {
  width: 60%;
}

.page-about .roster__item:nth-child(3) .roster__fill {
  width: 40%;
  background: var(--amber);
}

.page-about .roster__item:nth-child(4) .roster__fill {
  width: 40%;
  background: var(--amber);
}

.page-about .roster__desc {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--moss);
}

@media (min-width: 640px) {
  .page-about .roster {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 30px;
  }
}

/* 版本年表 */
.page-about .chapter__band {
  margin: 0 0 22px;
}

.page-about .chapter__band img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .timeline {
  display: grid;
  gap: 0;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline__item {
  position: relative;
  padding: 12px 0 15px 24px;
  border-left: 1px solid var(--line);
  transition: background-color 0.2s var(--ease);
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 20px;
  width: 8px;
  height: 8px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--green-900);
}

.page-about .timeline__item:hover {
  background: var(--paper-200);
}

.page-about .timeline__meta {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 6px;
}

.page-about .timeline__year {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--green-900);
}

.page-about .timeline__ver {
  padding: 2px 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--amber-deep);
  background: var(--paper-200);
}

.page-about .timeline__title {
  margin: 0 0 4px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--char);
}

.page-about .timeline__text {
  margin: 0;
  max-width: 34em;
  font-size: 14px;
  line-height: 1.72;
  color: var(--moss);
}

@media (min-width: 768px) {
  .page-about .timeline__item {
    padding: 14px 20px 16px 26px;
  }

  .page-about .timeline__year {
    font-size: 15px;
  }
}

/* 尾部数据带与入口 */
.page-about .chapter--continue {
  padding-bottom: 72px;
}

.page-about .about-cta {
  margin-top: 24px;
}

.page-about .about-cta__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-cta__stat {
  padding: 18px 16px;
  background: var(--paper);
}

.page-about .about-cta__value {
  display: block;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--green-900);
}

.page-about .about-cta__label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  line-height: 1.55;
  color: var(--moss);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

@media (min-width: 768px) {
  .page-about .about-cta__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-cta__value {
    font-size: 26px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .timeline__item {
    transition: none;
  }
}