.page-about {
  --about-rail-w: clamp(2.75rem, 6.5vw, 5rem);
  --about-ink-soft: rgba(243, 235, 221, 0.74);
  --about-gap: clamp(1.1rem, 3vw, 2rem);
  background-color: var(--mat);
  color: var(--ivory);
  font-family: var(--font-body);
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(1.25rem, 3.5vw, 2.25rem) clamp(2.25rem, 5.5vw, 4rem);
  background:
    radial-gradient(circle at 16% 0%, rgba(94, 140, 106, 0.24), transparent 58%),
    linear-gradient(162deg, var(--mat) 0%, var(--mat-deep) 66%, var(--char) 100%);
  border-bottom: 3px solid var(--line-strong);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(0.9rem, 2.6vw, 1.6rem);
}

.page-about .about-hero__frame {
  position: relative;
  border: 3px solid var(--line-strong);
  background: linear-gradient(180deg, rgba(20, 19, 18, 0.62), rgba(14, 43, 36, 0.42));
  box-shadow: var(--shadow-hard);
  padding: clamp(1.1rem, 4vw, 2.75rem);
}

.page-about .about-hero__frame::before,
.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  width: 1.05rem;
  height: 1.05rem;
  border: 3px solid var(--gold);
}

.page-about .about-hero__frame::before {
  top: -0.35rem;
  left: -0.35rem;
  border-right: 0;
  border-bottom: 0;
}

.page-about .about-hero__frame::after {
  right: -0.35rem;
  bottom: -0.35rem;
  border-top: 0;
  border-left: 0;
}

.page-about .about-hero__title {
  margin: 0.4rem 0 0.9rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.75rem, 6vw, 3.25rem);
  line-height: 1.2;
  letter-spacing: 0.02em;
  color: var(--ivory);
}

.page-about .about-hero__lede {
  max-width: 60ch;
  margin: 0;
  font-size: clamp(0.9375rem, 2.4vw, 1.0625rem);
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.page-about .about-hero__marks {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1.75rem;
  margin-top: clamp(1.1rem, 3vw, 1.75rem);
  padding-top: 1rem;
  border-top: 1px dashed var(--line-strong);
}

.page-about .mark {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  min-width: 8.5rem;
}

.page-about .mark__num {
  font-family: var(--font-mono);
  font-size: 1.125rem;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .mark__label {
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--about-ink-soft);
}

.page-about .about-toc {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: clamp(1.1rem, 3vw, 1.6rem);
}

.page-about .about-toc .toc__link {
  display: inline-flex;
  align-items: center;
  padding: 0.4rem 0.7rem;
  font-size: 0.8125rem;
  line-height: 1.4;
  color: var(--bamboo-light);
  text-decoration: none;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-ui);
  background: rgba(20, 19, 18, 0.35);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-toc .toc__link:hover,
.page-about .about-toc .toc__link:focus-visible {
  color: var(--ivory);
  border-color: var(--gold);
}

.page-about .about-toc .toc__link[aria-current="true"] {
  color: var(--ink);
  background: var(--gold);
  border-color: var(--gold);
}

.page-about .about-hero__vlabel {
  display: none;
}

.page-about .about-chapter {
  position: relative;
  padding-block: clamp(2.25rem, 6vw, 4.5rem);
  scroll-margin-top: 6.5rem;
}

.page-about .about-chapter--char {
  background: linear-gradient(180deg, var(--char) 0%, var(--mat-deep) 100%);
  border-top: 3px solid var(--line-strong);
}

.page-about .about-chapter--mat {
  background: linear-gradient(180deg, var(--mat-deep) 0%, var(--mat) 55%, var(--mat-deep) 100%);
  border-top: 3px solid var(--line-strong);
}

.page-about .about-chapter__inner {
  display: grid;
  gap: var(--about-gap);
}

.page-about .chapter-rail {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.page-about .rail-index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  color: var(--gold);
}

.page-about .rail-title {
  margin: 0;
  padding-left: 0.7rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.375rem, 4.8vw, 1.875rem);
  line-height: 1.2;
  letter-spacing: 0.04em;
  color: var(--ivory);
  border-left: 4px solid var(--cinnabar);
}

.page-about .chapter-grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .chapter-main > .body-text {
  max-width: 66ch;
  margin: 0 0 1rem;
  font-size: clamp(0.9375rem, 2.3vw, 1.0625rem);
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.page-about .chapter-main > .body-text:last-child {
  margin-bottom: 0;
}

.page-about .about-tail {
  margin-top: clamp(1.25rem, 3vw, 1.75rem);
  padding-top: 1rem;
  border-top: 1px dashed var(--line-strong);
}

.page-about .chapter-side {
  display: grid;
  gap: 1rem;
  align-content: start;
}

/* 图片 */
.page-about .about-figure {
  margin: 0 0 clamp(1.1rem, 3vw, 1.6rem);
  border: 3px solid var(--line-strong);
  background: var(--mat-deep);
  box-shadow: 5px 5px 0 rgba(0, 0, 0, 0.45);
  overflow: hidden;
}

.page-about .media--wide {
  --media-ratio: 14 / 9;
}

.page-about .media--portrait {
  --media-ratio: 5 / 6;
}

.page-about .about-media--3x2 {
  --media-ratio: 3 / 2;
}

.page-about .about-figure .media__img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-figure .media__caption {
  padding: 0.6rem 0.85rem;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--stone);
  border-top: 1px solid var(--line);
  background: rgba(14, 43, 36, 0.6);
}

/* 时间线牌列 */
.page-about .deck {
  position: relative;
  display: grid;
  gap: 0.9rem;
  margin: clamp(1rem, 3vw, 1.6rem) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .deck::before {
  content: "";
  position: absolute;
  left: 0.6rem;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 2px;
  background: linear-gradient(180deg, var(--bamboo), var(--tea) 78%, transparent);
}

.page-about .deck-item {
  position: relative;
  margin-left: 1.9rem;
  padding: 0.9rem 1rem 1rem;
  border: 2px solid var(--line);
  background: var(--char-soft);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.45);
  transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .deck-item::before {
  content: "";
  position: absolute;
  left: -1.72rem;
  top: 1.05rem;
  width: 0.85rem;
  height: 1.25rem;
  border: 2px solid var(--tea);
  border-radius: 3px;
  background: var(--ivory);
  box-shadow: inset 0 0 0 2px rgba(14, 43, 36, 0.18);
}

.page-about .deck-item.is-in {
  border-color: var(--gold);
  box-shadow: 5px 5px 0 rgba(201, 162, 39, 0.28);
}

.page-about .deck-item__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .deck-item__title {
  margin: 0.2rem 0 0.4rem;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--ivory);
}

.page-about .deck-item__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

/* 手牌注记 */
.page-about .hand-note {
  padding: 1rem 1.1rem 1.1rem;
  border: 2px solid var(--line-strong);
  border-top: 4px solid var(--bamboo);
  background: rgba(30, 28, 26, 0.88);
  box-shadow: 5px 5px 0 rgba(0, 0, 0, 0.42);
}

.page-about .hand-note__title {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 0.06em;
  color: var(--bamboo-light);
}

.page-about .hand-note p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.82;
  color: var(--about-ink-soft);
}

.page-about .hand-note__link {
  display: inline-block;
  margin-top: 0.75rem;
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--gold);
  text-decoration: none;
  border-bottom: 2px solid var(--cinnabar);
  padding-bottom: 0.15rem;
}

.page-about .hand-note__link:hover,
.page-about .hand-note__link:focus-visible {
  color: var(--ivory);
}

/* 三步 */
.page-about .steps {
  display: grid;
  gap: 0.9rem;
  margin: clamp(1rem, 3vw, 1.5rem) 0 0;
  padding: 0;
  list-style: none;
  counter-reset: about-step;
}

.page-about .step {
  position: relative;
  padding: 1rem 1rem 1.05rem 3.25rem;
  border-left: 3px solid var(--bamboo);
  background: rgba(20, 19, 18, 0.55);
}

.page-about .step::before {
  counter-increment: about-step;
  content: counter(about-step, decimal-leading-zero);
  position: absolute;
  left: 0.85rem;
  top: 0.95rem;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--gold);
}

.page-about .step__title {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--ivory);
}

.page-about .step__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

/* 数字条 */
.page-about .stat-strip {
  display: grid;
  gap: 1px;
  margin-top: clamp(1.25rem, 3.5vw, 2rem);
  background: var(--line-strong);
  border: 2px solid var(--line-strong);
}

.page-about .stat {
  padding: 0.95rem 1.05rem 1.05rem;
  background: var(--mat-deep);
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 4.4vw, 2.5rem);
  line-height: 1;
  color: var(--gold);
}

.page-about .stat-label {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--about-ink-soft);
}

/* 团队角色 */
.page-about .role-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: clamp(1rem, 3vw, 1.5rem) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .role-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.85rem;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--ivory);
  text-decoration: none;
  border: 2px solid var(--line-strong);
  border-radius: var(--radius-ui);
  background: rgba(94, 140, 106, 0.14);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .role-link:hover,
.page-about .role-link:focus-visible {
  color: var(--gold);
  border-color: var(--gold);
}

.page-about .role-cards {
  display: grid;
  gap: 0.9rem;
  margin-top: 1rem;
}

.page-about .role-card {
  padding: 0.95rem 1.05rem 1.05rem;
  border: 2px solid var(--line-strong);
  border-left: 4px solid var(--bamboo);
  background: rgba(20, 19, 18, 0.62);
  scroll-margin-top: 7rem;
}

.page-about .role-card__title {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--ivory);
}

.page-about .role-card__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

/* 三件事 */
.page-about .pledge-list {
  display: grid;
  gap: 1.1rem;
  margin: clamp(1rem, 3vw, 1.6rem) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .pledge {
  padding-top: 0.85rem;
  border-top: 4px solid var(--gold);
}

.page-about .pledge:nth-child(2) {
  border-top-color: var(--cinnabar);
}

.page-about .pledge:nth-child(3) {
  border-top-color: var(--bamboo);
}

.page-about .pledge__title {
  margin: 0 0 0.45rem;
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 800;
  letter-spacing: 0.03em;
  color: var(--ivory);
}

.page-about .pledge__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.82;
  color: var(--about-ink-soft);
}

/* 下一步 */
.page-about .chapter-main > .lede {
  max-width: 62ch;
  margin: 0;
  font-size: clamp(0.9375rem, 2.4vw, 1.0625rem);
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.page-about .next-links {
  display: grid;
  gap: 0.75rem;
  margin-top: clamp(1.25rem, 3.5vw, 2rem);
}

.page-about .next-link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.85rem;
  padding: 0.85rem 1rem;
  color: var(--ivory);
  text-decoration: none;
  border: 2px solid var(--line-strong);
  background: rgba(20, 19, 18, 0.55);
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .next-link:hover,
.page-about .next-link:focus-visible {
  transform: translateY(-2px);
  border-color: var(--gold);
  background: rgba(30, 28, 26, 0.85);
}

.page-about .next-link__idx {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--gold);
}

.page-about .next-link__label {
  display: block;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.page-about .next-link__desc {
  display: block;
  margin-top: 0.2rem;
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 400;
  line-height: 1.6;
  color: var(--about-ink-soft);
}

.page-about .next-link__arrow {
  font-size: 1.1rem;
  color: var(--cinnabar);
}

.page-about .about-sign {
  margin: clamp(1.5rem, 4vw, 2.25rem) 0 0;
  padding-left: 0.9rem;
  font-family: var(--font-display);
  font-size: clamp(1rem, 2.6vw, 1.25rem);
  letter-spacing: 0.12em;
  color: var(--ivory-dim);
  border-left: 4px solid var(--cinnabar);
}

@media (min-width: 640px) {
  .page-about .stat-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-chapter__inner {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    column-gap: clamp(1.25rem, 3.5vw, 2.75rem);
  }

  .page-about .chapter-rail {
    position: sticky;
    top: 6.5rem;
    align-self: start;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }

  .page-about .rail-title {
    padding: 0.7rem 0 0;
    font-size: clamp(1.625rem, 2.4vw, 2.125rem);
    letter-spacing: 0.24em;
    writing-mode: vertical-rl;
    border-left: 0;
    border-top: 4px solid var(--cinnabar);
  }

  .page-about .pledge-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.35rem;
  }
}

@media (min-width: 1000px) {
  .page-about .chapter-grid--split {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.82fr);
    align-items: start;
  }

  .page-about .chapter-grid--split > .hand-note {
    margin-top: clamp(1rem, 4vw, 3rem);
  }

  .page-about .chapter-grid--split > .chapter-side .hand-note {
    margin-top: 0;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__vlabel {
    display: block;
    position: absolute;
    right: 1.25rem;
    top: 26%;
    writing-mode: vertical-rl;
    font-family: var(--font-display);
    font-size: 0.8125rem;
    letter-spacing: 0.4em;
    color: rgba(201, 162, 39, 0.6);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .deck-item,
  .page-about .next-link,
  .page-about .about-toc .toc__link,
  .page-about .role-link {
    transition: none;
  }

  .page-about .next-link:hover {
    transform: none;
  }
}