/* ============================================
   平台总览 /overview/ —— 页面作用域 .page-about
   ============================================ */

.page-about {
  --about-gap: clamp(46px, 6.5vw, 92px);
  --about-hair: 1px solid rgba(46, 90, 69, 0.55);
  --about-hair-soft: 1px dashed rgba(46, 90, 69, 0.45);
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  padding-bottom: clamp(52px, 8vw, 104px);
}

.page-about a {
  color: var(--lime);
}

.page-about a:focus-visible,
.page-about .switch__input:focus-visible ~ .switch__tabs .switch__tab {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding-block: clamp(14px, 2vw, 22px) 0;
}

.page-about .about-crumbs .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

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

.page-about .about-crumbs .breadcrumbs a:hover {
  color: var(--lime);
}

.page-about .about-crumbs .breadcrumbs [aria-current="page"] {
  color: var(--gold);
  font-weight: 700;
}

.page-about .about-crumbs .breadcrumbs__sep {
  color: rgba(143, 167, 154, 0.6);
}

/* ---------- 首屏分屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
  padding-block: clamp(22px, 3.4vw, 46px) clamp(28px, 4vw, 54px);
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }
}

.page-about .about-hero__lede {
  max-width: 62ch;
}

.page-about .coord {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .coord::before {
  content: "";
  flex: 0 0 auto;
  width: 14px;
  height: 2px;
  background: var(--lime);
  transform: skewX(-30deg);
}

.page-about h1 {
  margin: clamp(14px, 1.8vw, 20px) 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(36px, 7.4vw, 74px);
  line-height: 1.0;
  letter-spacing: -0.028em;
  color: var(--text);
}

.page-about .about-hero__lead {
  margin: clamp(18px, 2.4vw, 28px) 0 0;
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.68;
  color: var(--text);
  max-width: 52ch;
}

.page-about .about-hero__body {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
  max-width: 56ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
}

/* 首屏数据面板 */
.page-about .about-hero__panel {
  position: relative;
  padding: clamp(20px, 2.6vw, 30px);
  background-color: var(--panel);
  background-image:
    repeating-linear-gradient(90deg, rgba(46, 90, 69, 0.22) 0 1px, transparent 1px 30px),
    linear-gradient(155deg, rgba(12, 36, 26, 0.98), rgba(6, 21, 15, 0.9));
  border: var(--about-hair);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .about-hero__panel::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--lime), rgba(198, 255, 61, 0.05));
}

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

.page-about .about-facts {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
}

.page-about .about-facts li {
  display: grid;
  grid-template-columns: 5.6rem minmax(0, 1fr);
  gap: 8px 14px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: var(--about-hair-soft);
}

.page-about .about-facts li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-facts__num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.3vw, 26px);
  font-weight: 700;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--lime);
}

.page-about .about-facts__label {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 章节坐标索引条 ---------- */
.page-about .chapter-index {
  position: sticky;
  top: 0;
  z-index: 30;
  margin-block: clamp(6px, 1vw, 12px) clamp(24px, 4vw, 46px);
  background: rgba(6, 21, 15, 0.94);
  border-top: 1px solid rgba(46, 90, 69, 0.5);
  border-bottom: 1px solid rgba(46, 90, 69, 0.5);
  backdrop-filter: blur(8px);
}

.page-about .chapter-index__inner {
  display: flex;
  padding-block: 9px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .chapter-index__inner::-webkit-scrollbar {
  display: none;
}

.page-about .chapter-index__list {
  display: flex;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
  white-space: nowrap;
}

.page-about .chapter-index__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 13px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid transparent;
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
  transition: color 0.18s ease, background-color 0.18s ease, border-color 0.18s ease;
}

.page-about .chapter-index__list a:hover,
.page-about .chapter-index__list a:focus-visible {
  color: var(--text);
  background: var(--panel);
  border-color: rgba(198, 255, 61, 0.42);
}

.page-about .chapter-index__list .mono {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding-block: clamp(32px, 4.6vw, 62px);
}

.page-about .about-section + .about-section {
  border-top: var(--about-hair-soft);
}

.page-about .about-section__head {
  max-width: 76ch;
  margin-bottom: clamp(22px, 3vw, 36px);
}

.page-about .about-section__head h2 {
  margin: clamp(10px, 1.4vw, 16px) 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.1;
  letter-spacing: -0.022em;
  color: var(--text);
}

.page-about .about-section__note {
  margin: 14px 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
  max-width: 70ch;
}

/* ---------- 正文排版 ---------- */
.page-about .prose {
  max-width: 74ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--text);
}

.page-about .prose p {
  margin: 0 0 1.05em;
}

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

.page-about .prose ul {
  list-style: none;
  margin: 0 0 1.05em;
  padding: 0;
}

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

.page-about .prose ul li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 9px;
  color: var(--text);
}

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

.page-about .prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.76em;
  width: 11px;
  height: 1px;
  background: var(--lime);
}

/* ---------- A-01 分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }
}

.page-about .legend-note {
  position: relative;
  padding: clamp(18px, 2.2vw, 26px);
  background: var(--panel);
  border: var(--about-hair);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
}

.page-about .legend-note::before {
  content: "";
  position: absolute;
  left: 0;
  right: 40%;
  top: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--lime), rgba(198, 255, 61, 0));
}

.page-about .legend-note__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-about .legend-note dl {
  margin: 0;
  display: grid;
  gap: 14px;
}

.page-about .legend-note dt {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .legend-note dd {
  margin: 5px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  margin: clamp(24px, 3.6vw, 42px) 0 0;
}

.page-about .about-figure .img-frame {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  border: var(--about-hair);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

.page-about .about-figure .img-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: brightness(0.72) saturate(0.8) contrast(1.06);
}

.page-about .img-frame__caption {
  display: block;
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 72ch;
}

/* ---------- A-02 三层结构 ---------- */
.page-about .layer-stack {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2vw, 20px);
}

.page-about .layer {
  position: relative;
  display: grid;
  gap: 12px;
  padding: clamp(18px, 2.4vw, 28px);
  background: var(--panel);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 16px 100%, 0 calc(100% - 16px));
}

.page-about .layer::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--lime), rgba(198, 255, 61, 0));
}

@media (min-width: 760px) {
  .page-about .layer {
    grid-template-columns: 76px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .layer:nth-child(2) {
    margin-left: clamp(0px, 3vw, 46px);
  }

  .page-about .layer:nth-child(3) {
    margin-left: clamp(0px, 6vw, 92px);
  }
}

.page-about .layer__coord {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .layer__body h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(17px, 2.1vw, 22px);
  line-height: 1.22;
  letter-spacing: -0.012em;
  color: var(--text);
}

.page-about .layer__body p {
  margin: 0 0 10px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
  max-width: 70ch;
}

.page-about .layer__body p.layer__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-size: 13px;
  color: var(--text);
}

.page-about .layer__meta .tag {
  flex: 0 0 auto;
}

/* ---------- A-03 编目 ---------- */
.page-about .catalog-grid {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
  align-items: start;
}

@media (min-width: 900px) {
  .page-about .catalog-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  }
}

.page-about .catalog-grid__visual {
  margin-top: 0;
}

.page-about .code-strip {
  margin-top: clamp(18px, 2.4vw, 26px);
  padding: clamp(16px, 2vw, 22px);
  border: var(--about-hair-soft);
  background-image: linear-gradient(180deg, rgba(12, 36, 26, 0.78), rgba(6, 21, 15, 0.62));
}

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

.page-about .code-strip__value {
  margin: 10px 0 6px;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--lime);
}

.page-about .code-strip__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .tick-list {
  list-style: none;
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .tick-list li {
  position: relative;
  padding-left: 24px;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--text);
}

.page-about .tick-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.66em;
  width: 13px;
  height: 2px;
  background: var(--gold);
  transform: skewX(-30deg);
}

/* ---------- A-04 团队账本 ---------- */
.page-about .team-ledger {
  margin: 0;
  border-top: var(--about-hair);
}

.page-about .team-ledger__row {
  display: grid;
  gap: 8px 32px;
  padding: clamp(16px, 2.2vw, 26px) 0;
  border-bottom: var(--about-hair-soft);
}

@media (min-width: 800px) {
  .page-about .team-ledger__row {
    grid-template-columns: minmax(0, 3fr) minmax(0, 8fr);
  }
}

.page-about .team-ledger dt {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(16px, 1.9vw, 20px);
  line-height: 1.3;
  letter-spacing: -0.012em;
  color: var(--text);
}

.page-about .team-ledger dt span {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .team-ledger dd {
  margin: 0;
  max-width: 74ch;
}

.page-about .team-ledger dd p {
  margin: 0 0 10px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .team-ledger dd p:last-child {
  margin-bottom: 0;
}

/* ---------- A-05 更新节奏 ---------- */
.page-about .rhythm-band {
  padding: clamp(20px, 3vw, 34px);
  border: var(--about-hair);
  background-image: linear-gradient(120deg, rgba(12, 36, 26, 0.95) 0%, rgba(6, 21, 15, 0.62) 70%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .rhythm-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .rhythm-list li {
  display: grid;
  grid-template-columns: 6rem minmax(0, 1fr);
  gap: 6px 20px;
  padding: 15px 0;
  border-bottom: var(--about-hair-soft);
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .rhythm-list li:last-child {
  border-bottom: 0;
}

.page-about .rhythm-list strong {
  color: var(--text);
  font-weight: 700;
}

.page-about .rhythm-list__time {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
  color: var(--lime);
}

.page-about .rhythm-band__foot {
  margin: clamp(16px, 2.2vw, 24px) 0 0;
  padding-top: 16px;
  border-top: var(--about-hair-soft);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 74ch;
}

/* ---------- A-06 时间线 ---------- */
.page-about .timeline {
  position: relative;
  padding: clamp(22px, 3vw, 34px);
  border: var(--about-hair);
  background: var(--ink);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
  overflow: hidden;
}

.page-about .timeline__backdrop {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.26;
  filter: brightness(0.6) saturate(0.7);
  pointer-events: none;
}

.page-about .timeline__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

@media (min-width: 880px) {
  .page-about .timeline__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 22px;
  }
}

.page-about .timeline__stage {
  position: relative;
  padding-top: 14px;
  border-top: 2px solid rgba(242, 179, 61, 0.72);
}

.page-about .timeline__stage--current {
  border-top-color: var(--lime);
}

.page-about .timeline__stage summary {
  display: flex;
  align-items: baseline;
  gap: 10px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
}

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

.page-about .timeline__stage summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--gold);
}

.page-about .timeline__stage[open] summary::after {
  content: "–";
  color: var(--lime);
}

.page-about .timeline__ver {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .timeline__stage--current .timeline__ver {
  color: var(--lime);
}

.page-about .timeline__body p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.74;
  color: var(--muted);
}

/* ---------- A-07 口径与纠错 ---------- */
.page-about .caliber-grid {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
  align-items: start;
}

@media (min-width: 940px) {
  .page-about .caliber-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }
}

.page-about .switch {
  position: relative;
  padding: clamp(16px, 2.2vw, 24px);
  background: var(--panel);
  border: var(--about-hair);
  clip-path: polygon(18px 0, 100% 0, 100% 100%, 0 100%, 0 18px);
}

.page-about .switch__input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-about .switch__tabs {
  display: flex;
  gap: 6px;
}

.page-about .switch__tab {
  padding: 7px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--muted);
  background: rgba(6, 21, 15, 0.7);
  border: 1px solid rgba(46, 90, 69, 0.7);
  cursor: pointer;
  clip-path: polygon(6px 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%, 0 6px);
}

.page-about .switch__tab:hover {
  color: var(--text);
}

.page-about .switch__input--count:checked ~ .switch__tabs .switch__tab--count,
.page-about .switch__input--share:checked ~ .switch__tabs .switch__tab--share {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--ink);
}

.page-about .switch__table {
  width: 100%;
  margin-top: 16px;
  border-collapse: collapse;
  font-size: 14px;
}

.page-about .switch__table caption {
  caption-side: top;
  text-align: left;
  padding-bottom: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .switch__table th,
.page-about .switch__table td {
  padding: 10px 10px 10px 0;
  text-align: right;
  border-bottom: var(--about-hair-soft);
}

.page-about .switch__table thead th {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--muted);
  border-bottom-color: rgba(46, 90, 69, 0.75);
}

.page-about .switch__table thead th:first-child,
.page-about .switch__table tbody th {
  text-align: left;
}

.page-about .switch__table tbody th {
  font-weight: 700;
  color: var(--text);
}

.page-about .switch__table tbody td {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--lime);
}

.page-about .switch__table tfoot th,
.page-about .switch__table tfoot td {
  padding-top: 12px;
  border-bottom: 0;
  color: var(--gold);
  font-family: var(--font-mono);
  font-weight: 700;
}

.page-about .switch__table tfoot th {
  text-align: left;
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: 0.06em;
}

.page-about .switch__table .th--count,
.page-about .switch__table .val--count {
  display: table-cell;
}

.page-about .switch__table .th--share,
.page-about .switch__table .val--share {
  display: none;
}

.page-about .switch__input--share:checked ~ .switch__table .th--share,
.page-about .switch__input--share:checked ~ .switch__table .val--share {
  display: table-cell;
}

.page-about .switch__input--share:checked ~ .switch__table .th--count,
.page-about .switch__input--share:checked ~ .switch__table .val--count {
  display: none;
}

.page-about .switch__input--count:checked ~ .switch__table .th--count,
.page-about .switch__input--count:checked ~ .switch__table .val--count {
  display: table-cell;
}

.page-about .switch__input--count:checked ~ .switch__table .th--share,
.page-about .switch__input--count:checked ~ .switch__table .val--share {
  display: none;
}

/* 纠错图例块 */
.page-about .legend-block {
  position: relative;
  margin-top: clamp(26px, 3.6vw, 44px);
  padding: clamp(18px, 2.4vw, 28px);
  border: var(--about-hair);
  background-image: repeating-linear-gradient(0deg, rgba(46, 90, 69, 0.16) 0 1px, transparent 1px 26px);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
}

.page-about .legend-block__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
}

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

.page-about .legend-block__list li {
  display: grid;
  gap: 4px 20px;
  padding: 12px 0;
  border-bottom: var(--about-hair-soft);
}

.page-about .legend-block__list li:last-child {
  border-bottom: 0;
}

@media (min-width: 720px) {
  .page-about .legend-block__list li {
    grid-template-columns: 8.5rem minmax(0, 1fr);
    align-items: baseline;
  }
}

.page-about .legend-block__key {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--lime);
}

.page-about .legend-block__val {
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--muted);
}

.page-about .legend-block__foot {
  margin: clamp(16px, 2.2vw, 22px) 0 0;
  padding-top: 14px;
  border-top: var(--about-hair-soft);
  font-size: 14px;
  line-height: 1.74;
  color: var(--text);
  max-width: 76ch;
}

.page-about .legend-block__foot a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 收束区 ---------- */
.page-about .about-outro {
  margin-top: clamp(38px, 5.6vw, 70px);
  padding: clamp(24px, 3.4vw, 42px);
  background-image: linear-gradient(135deg, rgba(198, 255, 61, 0.09), rgba(6, 21, 15, 0) 62%);
  border: 1px solid rgba(198, 255, 61, 0.3);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .about-outro h2 {
  margin: clamp(10px, 1.4vw, 16px) 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .outro-links {
  display: grid;
  gap: 0;
  margin-top: clamp(16px, 2.2vw, 24px);
  border-top: var(--about-hair-soft);
}

.page-about .outro-links a {
  display: block;
  padding: 13px 0 13px 24px;
  position: relative;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text);
  text-decoration: none;
  border-bottom: var(--about-hair-soft);
}

.page-about .outro-links a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.28em;
  width: 13px;
  height: 2px;
  background: var(--lime);
  transform: skewX(-30deg);
}

.page-about .outro-links a:hover,
.page-about .outro-links a:focus-visible {
  color: var(--lime);
  background: rgba(12, 36, 26, 0.6);
}

/* ---------- 窄屏收口 ---------- */
@media (max-width: 640px) {
  .page-about .about-facts li {
    grid-template-columns: 4.6rem minmax(0, 1fr);
  }

  .page-about .rhythm-list li {
    grid-template-columns: 5.2rem minmax(0, 1fr);
  }

  .page-about .layer,
  .page-about .switch,
  .page-about .legend-note,
  .page-about .legend-block,
  .page-about .timeline,
  .page-about .rhythm-band,
  .page-about .about-outro {
    clip-path: none;
    border-radius: 0;
  }

  .page-about .switch__table th,
  .page-about .switch__table td {
    padding-right: 6px;
    font-size: 13px;
  }
}

/* ---------- 动效（尊重 reduced-motion） ---------- */
@media (prefers-reduced-motion: no-preference) {
  .page-about .chapter-index__list a {
    transition: color 0.18s ease, background-color 0.18s ease, border-color 0.18s ease;
  }

  .page-about .switch__tab {
    transition: background-color 0.16s ease, color 0.16s ease, border-color 0.16s ease;
  }

  .page-about .outro-links a {
    transition: color 0.16s ease, background-color 0.16s ease;
  }
}