.page-about {
  --about-card: #FBF5E9;
  background: var(--cream);
  color: var(--ink);
  overflow-x: hidden;
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: 22px;
  padding-bottom: 22px;
}

/* ---------- 首屏：非对称分屏 ---------- */
.page-about .about-hero {
  display: grid;
  grid-template-columns: 1fr;
  border-top: 3px solid var(--char);
  border-bottom: 3px solid var(--char);
}

.page-about .about-hero__narrative {
  padding: clamp(26px, 5vw, 68px) clamp(20px, 4.5vw, 64px) clamp(30px, 5vw, 72px);
}

.page-about .about-hero__eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--moss);
}

.page-about .about-hero__eyebrow::before {
  content: "";
  flex: none;
  width: 28px;
  height: 3px;
  background: var(--coral);
}

.page-about .about-hero__title {
  margin: 0 0 22px;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 5.4vw, 3.5rem);
  font-weight: 800;
  line-height: 1.07;
  letter-spacing: -0.012em;
  color: var(--ink);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 34em;
  font-family: var(--font-serif);
  font-size: clamp(1rem, 1.5vw, 1.13rem);
  line-height: 1.95;
  color: var(--moss);
}

.page-about .about-hero__panel {
  padding: clamp(26px, 4.5vw, 56px) clamp(20px, 4vw, 48px);
  background: var(--panel);
  border-top: 3px solid var(--char);
  color: var(--cream);
}

.page-about .about-hero__panel-title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--lime);
}

.page-about .about-facts {
  margin: 18px 0 0;
  padding: 0;
}

.page-about .about-facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px solid var(--moss);
}

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

.page-about .about-facts dt {
  flex: none;
  font-size: 0.85rem;
  color: var(--mute);
}

.page-about .about-facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 500;
  text-align: right;
  color: var(--cream);
}

.page-about .about-facts__row--key dd {
  color: var(--lime);
}

@media (min-width: 960px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
  }

  .page-about .about-hero__panel {
    border-top: 0;
    border-left: 3px solid var(--char);
  }
}

/* ---------- 章节容器 ---------- */
.page-about .about-chapters {
  padding: clamp(36px, 6vw, 84px) 0 clamp(40px, 7vw, 96px);
}

.page-about .about-chapter {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  padding: clamp(28px, 4.5vw, 56px) 0;
  border-bottom: 1px solid var(--paper-line);
}

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

.page-about .about-chapter__num {
  width: fit-content;
  min-width: 56px;
  padding-top: 8px;
  border-top: 3px solid var(--coral);
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 2.6vw, 2rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.page-about .about-chapter__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3.2vw, 2rem);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.005em;
  color: var(--ink);
}

.page-about .about-chapter__lede {
  margin: 0 0 22px;
  padding-left: 14px;
  max-width: 34em;
  border-left: 3px solid var(--paper-line);
  font-family: var(--font-serif);
  font-size: clamp(0.98rem, 1.3vw, 1.08rem);
  line-height: 1.9;
  color: var(--moss);
}

.page-about .about-chapter__main .prose p {
  max-width: 36em;
  margin: 0 0 15px;
  font-size: 0.96rem;
  line-height: 1.88;
  color: var(--ink);
}

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

.page-about .about-chapter__main .prose a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--coral);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.page-about .about-chapter__main .prose a:hover,
.page-about .about-chapter__main .prose a:focus-visible {
  background: var(--lime);
  text-decoration-color: var(--ink);
}

.page-about .about-chapter__main .prose ul {
  margin: 0;
  padding: 0;
  max-width: 36em;
  list-style: none;
}

.page-about .about-chapter__main .prose li {
  position: relative;
  margin-bottom: 13px;
  padding-left: 24px;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--ink);
}

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

.page-about .about-chapter__main .prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.66em;
  width: 10px;
  height: 3px;
  background: var(--coral);
}

.page-about .about-chapter__note {
  padding-top: 12px;
  border-top: 2px solid var(--coral);
  font-size: 0.84rem;
  line-height: 1.75;
  color: var(--moss);
}

.page-about .about-chapter__note-key {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--ink);
}

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

@media (min-width: 900px) {
  .page-about .about-chapter {
    grid-template-columns: 92px minmax(0, 1fr) 240px;
    column-gap: clamp(24px, 3.5vw, 48px);
    align-items: start;
  }
}

/* ---------- 状态卡片 ---------- */
.page-about .status-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin: 26px 0 0;
  max-width: 44em;
}

.page-about .status-card {
  padding: 18px 16px 20px;
  background: var(--about-card);
  border: 2px solid var(--char);
  box-shadow: var(--hard-shadow-sm);
  transition: box-shadow var(--dur) linear;
}

.page-about .status-card:hover,
.page-about .status-card:focus-within {
  box-shadow: 6px 6px 0 var(--char);
}

.page-about .status-card__title {
  margin: 14px 0 10px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .status-card__body {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.78;
  color: var(--moss);
}

.page-about .status-card__body a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--coral);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

@media (min-width: 760px) {
  .page-about .status-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    max-width: none;
  }
}

/* ---------- 图注与图片 ---------- */
.page-about .about-figure {
  margin: clamp(28px, 4vw, 44px) 0 0;
}

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

.page-about .figure__cap {
  margin-top: 12px;
  max-width: 44em;
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--moss);
}

/* ---------- 中间呼吸区 ---------- */
.page-about .about-breather {
  padding: clamp(40px, 7vw, 88px) 0;
  background: var(--panel);
  border-top: 3px solid var(--char);
  border-bottom: 3px solid var(--char);
}

.page-about .about-breather .figure {
  margin: 0;
}

.page-about .about-breather .figure__cap {
  color: var(--mute);
}

/* ---------- 版本带 ---------- */
.page-about .version-band {
  margin: 24px 0 0;
  border: 2px solid var(--char);
  background: var(--about-card);
  box-shadow: var(--hard-shadow-sm);
}

.page-about .version-band__input {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.page-about .version-band__tabs {
  display: grid;
  grid-template-columns: 1fr;
  border-bottom: 2px solid var(--char);
}

.page-about .version-tab {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 15px 18px;
  border-bottom: 1px solid var(--paper-line);
  color: var(--ink);
  cursor: pointer;
  transition: background var(--dur) linear, color var(--dur) linear;
}

.page-about .version-tab:last-of-type {
  border-bottom: 0;
}

.page-about .version-tab__tag {
  font-family: var(--font-mono);
  font-size: 1.08rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: inherit;
}

.page-about .version-tab__range {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: inherit;
  opacity: 0.72;
}

.page-about .version-band:has(#about-ver-v1:checked) .version-tab[for="about-ver-v1"],
.page-about .version-band:has(#about-ver-v2:checked) .version-tab[for="about-ver-v2"],
.page-about .version-band:has(#about-ver-v3:checked) .version-tab[for="about-ver-v3"] {
  background: var(--panel);
  color: var(--cream);
}

.page-about .version-band:has(#about-ver-v1:checked) .version-tab[for="about-ver-v1"] .version-tab__tag,
.page-about .version-band:has(#about-ver-v2:checked) .version-tab[for="about-ver-v2"] .version-tab__tag,
.page-about .version-band:has(#about-ver-v3:checked) .version-tab[for="about-ver-v3"] .version-tab__tag {
  color: var(--lime);
}

.page-about .version-band:has(#about-ver-v1:focus-visible) .version-tab[for="about-ver-v1"],
.page-about .version-band:has(#about-ver-v2:focus-visible) .version-tab[for="about-ver-v2"],
.page-about .version-band:has(#about-ver-v3:focus-visible) .version-tab[for="about-ver-v3"] {
  outline: 3px solid var(--coral);
  outline-offset: -3px;
}

@media (min-width: 700px) {
  .page-about .version-band__tabs {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .version-tab {
    border-bottom: 0;
    border-right: 1px solid var(--paper-line);
  }

  .page-about .version-tab:last-of-type {
    border-right: 0;
  }
}

.page-about .version-panel {
  display: none;
  padding: 20px 18px 24px;
}

.page-about #about-ver-v1:checked ~ .version-band__panels .version-panel--v1,
.page-about #about-ver-v2:checked ~ .version-band__panels .version-panel--v2,
.page-about #about-ver-v3:checked ~ .version-band__panels .version-panel--v3 {
  display: block;
}

.page-about .version-panel__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  padding: 9px 0;
  border-bottom: 1px solid var(--paper-line);
}

.page-about .version-panel__key {
  flex: none;
  min-width: 5.5em;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--moss);
}

.page-about .version-panel__val {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--ink);
}

.page-about .version-panel__note {
  margin: 16px 0 0;
  max-width: 34em;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--moss);
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .status-card,
  .page-about .version-tab {
    transition-duration: 0.01ms;
  }
}
</style>