.page-about {
  --about-body: rgba(242, 239, 230, .84);
  --about-rail: 128px;
  background: var(--ink-900);
  color: var(--paper);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: clip;
}

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

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

.page-about .breadcrumb {
  position: relative;
  z-index: 1;
  margin-bottom: clamp(20px, 4vw, 40px);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 5vw, 52px) 0 clamp(44px, 7vw, 92px);
  isolation: isolate;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: min(620px, 82vw);
  height: min(620px, 82vw);
  background: linear-gradient(150deg, rgba(53, 240, 208, .17), rgba(255, 122, 51, .08) 54%, transparent 80%);
  clip-path: polygon(32% 0, 100% 0, 100% 72%, 60% 100%, 0 44%);
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
}

.page-about .about-hero h1 {
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(34px, 7vw, 68px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0 0 clamp(16px, 2.5vw, 26px);
  max-width: 16ch;
  text-wrap: balance;
}

.page-about .about-hero__lede {
  font-size: clamp(16px, 1.9vw, 19px);
  line-height: 1.8;
  color: var(--about-body);
  max-width: 62ch;
  margin: 0;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0;
  padding: clamp(18px, 3vw, 26px) 0 0;
  border-top: 1px solid var(--line-strong);
  display: grid;
  gap: 16px;
}

.page-about .about-hero__facts li {
  display: grid;
  grid-template-columns: minmax(0, auto) minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
}

.page-about .about-stat__value {
  font-family: var(--font-data);
  font-weight: 600;
  font-size: clamp(19px, 2.6vw, 26px);
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
  color: var(--neon);
  white-space: nowrap;
}

.page-about .about-stat__label {
  font-size: 14px;
  line-height: 1.6;
  color: var(--paper-dim);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-section {
  padding: clamp(44px, 7vw, 92px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-section--tint {
  background: var(--ink-800);
}

.page-about .about-grid {
  display: grid;
  gap: clamp(16px, 3vw, 36px);
}

.page-about .about-rail {
  display: flex;
  align-items: center;
  gap: 14px;
}

.page-about .about-rail__num {
  font-family: var(--font-data);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--neon);
  font-variant-numeric: tabular-nums;
}

.page-about .about-rail__label {
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--paper-faint);
}

.page-about .section-heading {
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  margin: 0 0 clamp(14px, 2vw, 22px);
  max-width: 22ch;
}

.page-about .about-lede {
  font-size: clamp(16px, 1.7vw, 18px);
  line-height: 1.8;
  color: var(--paper);
  max-width: 62ch;
}

.page-about .about-body > p {
  color: var(--about-body);
  max-width: 68ch;
}

/* ---------- 档案图 ---------- */

.page-about .about-archive-figure,
.page-about .about-banner,
.page-about .about-team__figure {
  margin: 0 0 clamp(24px, 4vw, 40px);
}

.page-about .about-archive-figure img,
.page-about .about-team__figure img {
  width: 100%;
  border-radius: var(--radius-card);
  border: 1px solid var(--line);
  object-fit: cover;
}

.page-about .about-archive-figure img {
  aspect-ratio: 2 / 1;
}

.page-about .about-team__figure img {
  aspect-ratio: 3 / 2;
}

.page-about .about-banner img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-card);
  border: 1px solid var(--line);
}

.page-about .figure__caption {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--paper-faint);
}

/* ---------- 时间轴 ---------- */

.page-about .tl-track {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .tl-item {
  position: relative;
}

.page-about .tl-node {
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  padding: 16px 18px;
  box-shadow: var(--shadow-paper);
}

.page-about .about-section--tint .tl-node {
  background: var(--ink-900);
}

.page-about .tl-node summary {
  cursor: pointer;
  list-style: none;
  display: grid;
  gap: 6px;
}

.page-about .tl-node summary::-webkit-details-marker {
  display: none;
}

.page-about .tl-node__year {
  font-family: var(--font-data);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0.1em;
  font-variant-numeric: tabular-nums;
  color: var(--neon);
}

.page-about .tl-node__title {
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .tl-node[open] .tl-node__year {
  color: var(--signal);
}

.page-about .tl-node__body {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--about-body);
}

/* ---------- 栏目卡片 ---------- */

.page-about .about-cards {
  display: grid;
  gap: 14px;
}

.page-about .about-card {
  background: var(--ink-900);
  border: 1px solid var(--line);
  border-left: 3px solid var(--neon);
  border-radius: var(--radius);
  padding: 16px 18px;
  box-shadow: var(--shadow-paper);
}

.page-about .about-section--tint .about-card {
  background: var(--paper);
  color: var(--ink-900);
  border-color: rgba(11, 27, 43, .16);
  border-left-color: var(--neon);
}

.page-about .about-card summary {
  cursor: pointer;
  list-style: none;
  display: grid;
  gap: 8px;
  align-items: center;
}

.page-about .about-card summary::-webkit-details-marker {
  display: none;
}

.page-about .about-card__tag {
  justify-self: start;
}

.page-about .about-card__name {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-section--tint .about-card__name {
  color: var(--ink-900);
}

.page-about .about-card p {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--about-body);
}

.page-about .about-section--tint .about-card p {
  color: rgba(11, 27, 43, .78);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  display: grid;
  gap: clamp(20px, 4vw, 36px);
}

.page-about .about-team__text p {
  color: var(--about-body);
  max-width: 62ch;
}

.page-about .about-team__text .about-lede {
  color: var(--paper);
}

/* ---------- 更新节拍 ---------- */

.page-about .rhythm-list {
  list-style: none;
  margin: 0 0 clamp(20px, 3vw, 32px);
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .rhythm-item {
  background: var(--ink-900);
  border-radius: var(--radius);
  border-left: 3px solid var(--neon);
  padding: 16px 18px;
}

.page-about .rhythm-item:nth-child(2) {
  border-left-color: var(--signal);
}

.page-about .rhythm-item:nth-child(3) {
  border-left-color: var(--moss);
}

.page-about .rhythm-item__beat {
  display: block;
  font-family: var(--font-data);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.14em;
  font-variant-numeric: tabular-nums;
  color: var(--paper-dim);
  margin-bottom: 8px;
}

.page-about .rhythm-item h3 {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -0.01em;
  margin: 0 0 8px;
  color: var(--paper);
}

.page-about .rhythm-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--about-body);
}

.page-about .about-note {
  background: rgba(198, 81, 47, .12);
  border: 1px solid rgba(198, 81, 47, .4);
  border-radius: var(--radius-card);
  padding: 16px 18px;
}

.page-about .about-note p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-body);
}

/* ---------- 版本演进 ---------- */

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

.page-about .version-item {
  padding: 22px 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .version-item:last-child {
  border-bottom: 1px solid var(--line-strong);
}

.page-about .version-item__year {
  display: block;
  font-family: var(--font-data);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.16em;
  font-variant-numeric: tabular-nums;
  color: var(--neon);
  margin-bottom: 10px;
}

.page-about .version-item h3 {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(18px, 2.2vw, 22px);
  letter-spacing: -0.01em;
  margin: 0 0 10px;
  color: var(--paper);
}

.page-about .version-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-body);
  max-width: 40ch;
}

/* ---------- 川内专题标签行 ---------- */

.page-about #local .about-body > p:last-child {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

/* ---------- 下一步 ---------- */

.page-about .next-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .next-link {
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  text-decoration: none;
  color: inherit;
  transition: border-color 200ms var(--ease), transform 200ms var(--ease);
}

.page-about .next-link__name {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--neon);
}

.page-about .next-link__desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper-dim);
}

.page-about .next-link:hover,
.page-about .next-link:focus-visible {
  border-color: var(--neon);
  transform: translateY(-2px);
}

.page-about .next-link:focus-visible {
  outline: 1px solid var(--neon);
  outline-offset: 2px;
}

/* ---------- 桌面布局 ---------- */

@media (min-width: 760px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.7fr) minmax(260px, .9fr);
    align-items: end;
  }

  .page-about .about-hero__facts {
    padding-top: 24px;
  }

  .page-about .tl-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
    border-top: 2px solid var(--line-strong);
    padding-top: 0;
  }

  .page-about .tl-item {
    padding: 28px 16px 0 0;
  }

  .page-about .tl-item::before {
    content: "";
    position: absolute;
    top: -6px;
    left: 0;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--neon);
    box-shadow: 0 0 0 5px rgba(53, 240, 208, .14);
  }

  .page-about .tl-node {
    border: 0;
    background: transparent;
    box-shadow: none;
    padding: 0;
  }

  .page-about .about-section--tint .tl-node {
    background: transparent;
  }

  .page-about .about-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    align-items: start;
  }

  .page-about .about-team__figure {
    margin-bottom: 0;
  }

  .page-about .rhythm-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

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

  .page-about .version-item {
    padding: 24px 22px 24px 0;
    border-bottom: 1px solid var(--line-strong);
  }

  .page-about .version-item + .version-item {
    padding-left: 22px;
    border-left: 1px solid var(--line);
  }

  .page-about .next-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 980px) {
  .page-about .about-grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 48px);
  }

  .page-about .about-rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
    position: sticky;
    top: 148px;
    align-self: start;
  }

  .page-about .about-rail__label {
    writing-mode: vertical-rl;
    letter-spacing: 0.34em;
    font-size: 12px;
  }

  .page-about .version-item p {
    max-width: 32ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .next-link {
    transition: none;
  }

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